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4,341 results on '"HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies"'

1. Bounding the Number of Minimal Transversals in Tripartite 3-Uniform Hypergraphs

Author

Bazin, Alexandre, Beaudou, Laurent, Kahn, Giacomo, Khoshkhah, Kaveh, WEB Architecture x Semantic WEB x WEB of Data (WEB3), Laboratoire d'Informatique de Robotique et de Microélectronique de Montpellier (LIRMM), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM), Laboratoire d'Informatique, de Modélisation et d'Optimisation des Systèmes (LIMOS), Ecole Nationale Supérieure des Mines de St Etienne-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA)-Institut national polytechnique Clermont Auvergne (INP Clermont Auvergne), Université Clermont Auvergne (UCA)-Université Clermont Auvergne (UCA), Décision et Information pour les Systèmes de Production (DISP), Université Lumière - Lyon 2 (UL2)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA), Institute of Computer Science [University of Tartu, Estonie], University of Tartu, Le2i - CheckSem, School of Computer Science and Informatics [Dublin], University College Dublin [Dublin] (UCD)-University College Dublin [Dublin] (UCD)-Laboratoire Electronique, Informatique et Image [UMR6306] (Le2i), Université de Bourgogne (UB)-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement-Centre National de la Recherche Scientifique (CNRS)-Université de Bourgogne (UB)-École Nationale Supérieure d'Arts et Métiers (ENSAM), HESAM Université (HESAM)-HESAM Université (HESAM)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement-Centre National de la Recherche Scientifique (CNRS), Ecole Nationale Supérieure des Mines de St Etienne-Université Clermont Auvergne (UCA)-Centre National de la Recherche Scientifique (CNRS), Institute of Computer Science (University of Tartu) (CS), Laboratoire Lorrain de Recherche en Informatique et ses Applications (LORIA), Institut National de Recherche en Informatique et en Automatique (Inria)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), National Research University Higher School of Economics, Faculty of Computer Science (HSE-CS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université Lumière - Lyon 2 (UL2), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Arts et Métiers (ENSAM), HESAM Université (HESAM)-HESAM Université (HESAM)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement-Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Arts et Métiers (ENSAM), HESAM Université (HESAM)-HESAM Université (HESAM)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement, Centre National de la Recherche Scientifique (CNRS)-Université de Lorraine (UL)-Institut National de Recherche en Informatique et en Automatique (Inria), Ecole Nationale Supérieure des Mines de St Etienne (ENSM ST-ETIENNE)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA)-Institut national polytechnique Clermont Auvergne (INP Clermont Auvergne), and EUROSTAR PSDP project.'Fonds Européen de Développement Régional (FEDER)' program though project AAP ressourcement S3 – DIS 4 (2015-2018).Estonian Research Council, ETAG (Eesti Teadusagentuur), through PUT Exploratory Grant #620.

Subjects
FOS: Computer and information sciences, Mathematics::Combinatorics, k)-Hypergraphs, Discrete Mathematics (cs.DM), General Computer Science, Formal Concept Analysis, Hypergraph Transversals, 3)-Hypergraphs, Polyadic Concept Analysis, (k, [INFO.INFO-DM]Computer Science [cs]/Discrete Mathematics [cs.DM], Hypergraphs, Triadic Concept Analysis, Theoretical Computer Science, Measure and conquer, (3, Minimal transversal, Computer Science::Discrete Mathematics, [MATH.MATH-CO]Mathematics [math]/Combinatorics [math.CO], FOS: Mathematics, Mathematics - Combinatorics, Discrete Mathematics and Combinatorics, Combinatorics (math.CO), Computer Science - Discrete Mathematics
Abstract

We focus on the maximum number of minimal transversals in 3-partite 3-uniform hypergraphs on n vertices. Those hypergraphs (and their minimal transversals) are commonly found in database applications. In this paper we prove that this number grows at least like 1.4977^n and at most like 1.5012^n.

Published
2023

2. A review on the technologies, design considerations and numerical models of tidal current turbines

Author

Marwane Rouway, Mostapha Tarfaoui, Ibrahim Goda, M. Nachtane, Institut de Mécanique et d'Ingénierie de Bordeaux (I2M), Institut National de la Recherche Agronomique (INRA)-Université de Bordeaux (UB)-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS), Institut de Recherche Dupuy de Lôme (IRDL), Université de Bretagne Sud (UBS)-Université de Brest (UBO)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Centre National de la Recherche Scientifique (CNRS), Faculté des Sciences Aïn Chock [Casablanca] (FSAC), and Université Hassan II [Casablanca] (UH2MC)

Subjects
Emerging technologies, Computer science, Performance prediction, 020209 energy, 02 engineering and technology, 7. Clean energy, Turbine, [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph], [SPI]Engineering Sciences [physics], 0202 electrical engineering, electronic engineering, information engineering, 0601 history and archaeology, 14. Life underwater, Tidal current turbine (TCT), 060102 archaeology, Renewable Energy, Sustainability and the Environment, business.industry, Hydrofoil design, 06 humanities and the arts, Marine renewable energies, Renewable energy, Drag, Up-to-date review, Pitching moment, Electric power, Energy source, business, Marine engineering
Abstract

International audience; Tidal current turbine is one of the innovative and emerging technologies of marine renewable energies because it offers constant and predictable energy source that can be very beneficial, especially for commercial scale production of electrical power. Hydrofoils (HF) are essential elements of tidal current turbine (TCT) and should be properly designed as they play a vital role in improving the turbine output and providing adequate resistance to the blade structure. In connection with the hydrofoil designs, it is noteworthy that the primary objectives in their designs are to increase the coefficient of lift and to reduce the coefficients of drag and pitching moment, thus delaying the cavitation phenomenon. In this paper, the technology developments of the hydrofoil designs used in the horizontal axis TCT industry are reviewed, including the hydrodynamics design and the mechanical structure design. Besides, an up-todate review and the newest achievements of marine TCT technologies with their developing histories are further explored. Included are also reviews on the numerical models used to assess the performance of TCT and optimization methods applied to design the hydrofoils. This in turn significantly contributes to a better knowledge on the recent designs of TCT hydrofoils for the researchers working in the marine turbine energy domain. Such information could also have important implications in the design of more sophisticated hydrofoils for the exploitation in diverse tidal current energy technologies for reaching a sustainable future.

Published
2020

3. A machine learning framework for enhancing digital experiences in cultural heritage

Author

Sebti Foufou, Abdulaziz Khalid Al-Ali, Abdelaziz Bouras, Abdelhak Belhi, Qatar University, Décision et Information pour les Systèmes de Production (DISP), Université Lumière - Lyon 2 (UL2)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA), Laboratoire Electronique, Informatique et Image [UMR6306] (Le2i), Université de Bourgogne (UB)-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement-Centre National de la Recherche Scientifique (CNRS), and Qatar National Research Fund (Qatar Foundation) 9-181-1-036

Subjects
Computer science, Surf, General Decision Sciences, 02 engineering and technology, Machine learning, computer.software_genre, Annotation, Information, Management of Technology and Innovation, 11. Sustainability, 0202 electrical engineering, electronic engineering, information engineering, [INFO]Computer Science [cs], Cluster analysis, Digital heritage, business.industry, Deep learning, 020206 networking & telecommunications, Web, Cultural heritage, Metadata, Multimodal learning, Unsupervised learning, 020201 artificial intelligence & image processing, Artificial intelligence, business, Classifier (UML), computer, Information Systems
Abstract

Purpose: Digital tools have been used to document cultural heritage with high-quality imaging and metadata. However, some of the historical assets are totally or partially unlabeled and some are physically damaged, which decreases their attractiveness and induces loss of value. This paper introduces a new framework that aims at tackling the cultural data enrichment challenge using machine learning. Design/methodology/approach: This framework focuses on the automatic annotation and metadata completion through new deep learning classification and annotation methods. It also addresses issues related to physically damaged heritage objects through a new image reconstruction approach based on supervised and unsupervised learning. Findings: The authors evaluate approaches on a data set of cultural objects collected from various cultural institutions around the world. For annotation and classification part of this study, the authors proposed and implemented a hierarchical multimodal classifier that improves the quality of annotation and increases the accuracy of the model, thanks to the introduction of multitask multimodal learning. Regarding cultural data visual reconstruction, the proposed clustering-based method, which combines supervised and unsupervised learning is found to yield better quality completion than existing inpainting frameworks. Originality/value: This research work is original in sense that it proposes new approaches for the cultural data enrichment, and to the authors' knowledge, none of the existing enrichment approaches focus on providing an integrated framework based on machine learning to solve current challenges in cultural heritage. These challenges, which are identified by the authors are related to metadata annotation and visual reconstruction. 2020, Emerald Publishing Limited. The authors would also like to thank the Museum of Islamic Art (MIA), the MIA Multimedia team, Mr. Marc Pelletreau, the art curators and the management staff of the Museum of Islamic Art, Doha, Qatar, for their help and contribution in the data acquisition. This publication was made possible by NPRP grant 9-181-1-036 from the Qatar National Research Fund (a member of Qatar Foundation). The statements made herein are solely the responsibility of the authors ( www.ceproqha.qa ). Scopus

Published
2020

4. Investigating low-delay deep learning-based cultural image reconstruction

Author

Sebti Foufou, Abdelaziz Bouras, Xi Yu, Abdulaziz Khalid Al-Ali, Abdelhak Belhi, Haiqing Zhang, CSE Department, College of Engineering, Qatar University, PO BOX 2713, Doha, Qatar, Qatar University, Décision et Information pour les Systèmes de Production (DISP), Université Lumière - Lyon 2 (UL2)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA), Laboratoire Electronique, Informatique et Image [UMR6306] (Le2i), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement, School of Electrical Engineering and Information Technology [Chengdu], Sichuan University [Chengdu] (SCU), School of Software Engineering [Chengdu], Chengdu University of Technology (CDUT), Chengdu University of Information Technology, and NPRP grant from the Qatar National Research Fund (a member of Qatar Foundation) 9-181-1-036

Subjects
Computer science, Inpainting, 02 engineering and technology, Iterative reconstruction, Machine learning, computer.software_genre, Computer graphics, 0202 electrical engineering, electronic engineering, information engineering, [INFO]Computer Science [cs], Cluster analysis, Digital heritage, business.industry, Deep learning, Low delay, 020207 software engineering, Image clustering, [INFO.INFO-GR]Computer Science [cs]/Graphics [cs.GR], Value theory, Image reconstruction, Image inpainting, Unsupervised learning, 020201 artificial intelligence & image processing, Artificial intelligence, Resolution, business, Low-delay reconstruction, computer, Information Systems
Abstract

Numerous cultural assets host a great historical and moral value, but due to their degradation, this value is heavily affected as their attractiveness is lost. One of the solutions that most heritage organizations and museums currently choose is to leverage the knowledge of art and history experts in addition to curators to recover and restore the damaged assets. This process is labor-intensive, expensive and more often results in just an assumption over the damaged or missing region. In this work, we tackle the issue of completing missing regions in artwork through advanced deep learning and image reconstruction (inpainting) techniques. Following our analysis of different image completion and reconstruction approaches, we noticed that these methods suffer from various limitations such as lengthy processing times and hard generalization when trained with multiple visual contexts. Most of the existing learning-based image completion and reconstruction techniques are trained on large datasets with the objective of retrieving the original data distribution of the training samples. However, this distribution becomes more complex when the training data is diverse making the training process difficult and the reconstruction inefficient. Through this paper, we present a clustering-based low-delay image completion and reconstruction approach which combines supervised and unsupervised learning to address the highlighted issues. We compare our technique to the current state of the art using a real-world dataset of artwork collected from various cultural institutions. Our approach is evaluated using statistical methods and a surveyed audience to better interpret our results objectively and subjectively. 2020, Springer-Verlag GmbH Germany, part of Springer Nature. This publication was made possible by NPRP grant 9-181-1-036 from the Qatar National Research Fund (a member of Qatar Foundation). The statements made herein are solely the responsibility of the authors (www.ceproqha.qa ). The authors would also like to thank the Museum of Islamic Art (MIA), the MIA Multimedia team, Mr. Marc Pelletreau, the Art Curators and the management staff of the Museum of Islamic Art, Doha Qatar for their help and contribution in the data acquisition. Scopus

Published
2020

5. A general global-local modelling framework for the deterministic optimisation of composite structures

Author

Marco Picchi Scardaoni, Marco Montemurro, Institut de Mécanique et d'Ingénierie de Bordeaux (I2M), École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS)-Université de Bordeaux (UB)-Institut National de la Recherche Agronomique (INRA), University of Pisa - Università di Pisa, and This paper presents part of the activities carried out within the research project PARSIFAL ('PrandtlPlane ARchitecture for the Sustainable Improvement of Future AirpLanes'), which has been funded by the European Union under the Horizon 2020 Research and Innovation Program (Grant Agreement n.723149)

Subjects
Mathematical optimization, Control and Optimization, Cantilever, Local modelling approach, Computer science, 0211 other engineering and technologies, 02 engineering and technology, Marsaglia polar method, Design strategy, [SPI.MECA.SOLID]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Solid mechanics [physics.class-ph], 01 natural sciences, Polar method, 021105 building & construction, Mécanique: Mécanique des structures [Sciences de l'ingénieur], 0101 mathematics, Anisotropy, Composites, Buckling, Deterministic optimisation, Global/local modelling approach, Deterministic Optimisation, Mécanique: Mécanique des solides [Sciences de l'ingénieur], Global, Optimisation et contrôle [Mathématique], Computer Graphics and Computer-Aided Design, Computer Science Applications, Design for manufacturability, 010101 applied mathematics, [SPI.MECA.STRU]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Structural mechanics [physics.class-ph], Control and Systems Engineering, Macroscopic scale, [MATH.MATH-OC]Mathematics [math]/Optimization and Control [math.OC], Engineering design process, Software
Abstract

International audience; This work deals with the multi-scale optimisation of composite structures by adopting a general global-local (GL) modelling strategy to assess the structure responses at different scales. The GL modelling approach is integrated into the multi-scale two-level optimisation strategy (MS2LOS) for composite structures. The resulting design strategy is, thus, called GL-MS2LOS and aims at proposing a very general formulation of the design problem, without introducing simplifying hypotheses on the laminate stack and by considering, as design variables, the full set of geometric and mechanical parameters defining the behaviour of the composite structure at each pertinent scale. By employing a GL modelling approach, most of the limitations of well-established design strategies, based on analytical or semi-empirical models, are overcome. The GL-MS2LOS makes use of the polar formalism to describe the anisotropy of the composite at the macroscopic scale (where it is modelled as an equivalent homogeneous anisotropic plate). In this work, deterministic algorithms are exploited during the solution search phase. The challenge, when dealing with such a design problem, is to develop a suitable formulation and dedicated operators, to link global and local models physical responses and their gradients. Closed-form expressions of structural responses gradients are rigorously derived by taking into account for the coupling effects when passing from global to local models. The effectiveness of the GL-MS2LOS is proven on a meaningful benchmark: the least-weight design of a cantilever wing subject to different design requirements. Constraints include maximum allowable displacements, maximum allowable strains, blending, manufacturability requirements and buckling factor.; This work deals with the multi-scale optimisation of composite structures by adopting a general global-local (GL) modelling strategy to assess the structure responses at different scales. The GL modelling approach is integrated into the multi-scale two-level optimisation strategy (MS2LOS) for composite structures. The resulting design strategy is, thus, called GL-MS2LOS and aims at proposing a very general formulation of the design problem, without introducing simplifying hypotheses on the laminate stack and by considering, as design variables, the full set of geometric and mechanical parameters defining the behaviour of the composite structure at each pertinent scale. By employing a GL modelling approach, most of the limitations of well-established design strategies, based on analytical or semi-empirical models, are overcome. The GL-MS2LOS makes use of the polar formalism to describe the anisotropy of the composite at the macroscopic scale (where it is modelled as an equivalent homogeneous anisotropic plate). In this work, deterministic algorithms are exploited during the solution search phase. The challenge, when dealing with such a design problem, is to develop a suitable formulation and dedicated operators, to link global and local models physical responses and their gradients. Closed-form expressions of structural responses gradients are rigorously derived by taking into account for the coupling effects when passing from global to local models. The effectiveness of the GL-MS2LOS is proven on a meaningful benchmark: the least-weight design of a cantilever wing subject to different design requirements. Constraints include maximum allowable displacements, maximum allowable strains, blending, manufacturability requirements and buckling factor.

Published
2020

6. Using skeleton and Hough transform variant to correct skew in historical documents

Author

Dominique Michelucci, Omar Boudraa, Walid Khaled Hidouci, École Nationale Supérieure d'Informatique [Alger] (ESI), Laboratoire Electronique, Informatique et Image [UMR6306] (Le2i), Université de Bourgogne (UB)-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, and HESAM Université (HESAM)-HESAM Université (HESAM)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement-Centre National de la Recherche Scientifique (CNRS)

Subjects
General Computer Science, Horizontal and vertical, Morphological skeleton, Computer science, Skew estimation, ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION, Document image analysis, 010103 numerical & computational mathematics, 02 engineering and technology, Skeleton (category theory), 01 natural sciences, Measure (mathematics), Theoretical Computer Science, Hough transform, law.invention, Image (mathematics), law, 0202 electrical engineering, electronic engineering, information engineering, [INFO.INFO-DL]Computer Science [cs]/Digital Libraries [cs.DL], 0101 mathematics, Numerical Analysis, Pixel, business.industry, Applied Mathematics, Progressive probabilistic Hough transform, Skew, [INFO.INFO-CV]Computer Science [cs]/Computer Vision and Pattern Recognition [cs.CV], Pattern recognition, Skew correction, [INFO.INFO-TT]Computer Science [cs]/Document and Text Processing, Modeling and Simulation, 020201 artificial intelligence & image processing, Artificial intelligence, business
Abstract

International audience; As a main part of several document analysis systems, Skew estimation represents one of the major research challenges, particularly in case of historical documents exploration. In this paper, we propose an original skew angle detection and correction technique. Morphological Skeleton is introduced to considerably diminish the amount of data by eliminating the redundant pixels and preserving only the central curves of the image components. Next, the proposed method uses Progressive Probabilistic Hough Transform (PPHT) to find image lines. At the end, a specific procedure is applied in order to measure the global skew angle of the document image from these identified lines. Experimental results demonstrate the accuracy and the effectiveness of our approach on skew angle detection upon three popular datasets covering many types of documents of diverse linguistic writings (Chinese, Greek and English) and different styles (horizontal or vertical orientations, including figures and tables, multi-columns page layouts).

Published
2020

7. An Optimized Steepest Gradient Based Maximum Power Point Tracking for PV Control Systems

Author

Karima Amara, Ali Malek, Arezki Fekik, Mustapha Zaouia, El-Bay Bourennane, D. Hocine, Toufik Bakir, Laboratories des Technologies Avancées du Génie Electrique, Laboratories des Technologies Avancées du Génie Electrique (LATAGE), Centre de Développement des Energies Renouvelables (CDER), Ministère de l'Enseignement Supérieur et de la Recherche Scientifique [Algérie] (MESRS), Laboratoire d'Electronique, d'Informatique et d'Image [EA 7508] (Le2i), Université de Technologie de Belfort-Montbeliard (UTBM)-Université de Bourgogne (UB)-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, and HESAM Université (HESAM)-HESAM Université (HESAM)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement-Centre National de la Recherche Scientifique (CNRS)

Subjects
Hessian matrix, Maximum power principle, descent method, Computer science, MPPT, 7. Clean energy, Maximum power point tracking, symbols.namesake, Control theory, 0502 economics and business, Convergence (routing), Overshoot (signal), [INFO]Computer Science [cs], ANFIS, MATLAB, computer.programming_language, OSGM, MG, 05 social sciences, Photovoltaic system, General Engineering, P&O, symbols, 050211 marketing, computer, Gradient method, 050203 business & management
Abstract

In order to improve the photovoltaic (PV) production, the researchers are interested in developing new methods to reach the Maximum Power Point (MPP) produced by the photovoltaic field to be injected into the utility grid. This article describes a new method called the Optimized Steepest Gradient Method (OSGM), it is based on the first (gradient) and second order (hessian) derivatives of the power function in order to find the best variation of the voltage (Vpv) with the calculation of the optimal step allowing the convergence to the tension value (Vref) which ensures the MPP. The mathematical model has been developed and implemented under Matlab/Simulink environment. To analyze Maximum Power Point Tracking (MPPT) algorithm performances, time response, oscillation, overshoot and stability are taken into account. The OSGM is implemented and compared to three others algorithms (one of these algorithm is the ANFIS proposed in previous work). Performances obtained by the proposed algorithm offer faster response, less oscillations around MPP and a low energy loss. In addition, numerical computation of the gradient and the hessian of the power function allow bypassing modeling inaccuracies.

Published
2019

8. Low-noise and low power CMOS photoreceptor using split-length MOSFET

Author

Julien Dubois, Sofiene Mansouri, Jamel Nebhen, Dominique Ginhac, College of Computer Engineering and Sciences, Prince Sattam bin Abdulaziz University, Prince Sattam Bin Abdul-Aziz University (PSAU), Laboratoire Electronique, Informatique et Image [UMR6306] (Le2i), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement, Equipe CORES [ImViA - EA7535] (CORES), Imagerie et Vision Artificielle [Dijon] (ImViA), Université de Bourgogne (UB)-Université de Bourgogne (UB), and Université de Bourgogne (UB)

Subjects
low-power, Materials science, Noise reduction, Hardware_PERFORMANCEANDRELIABILITY, 02 engineering and technology, 01 natural sciences, Noise (electronics), law.invention, [SPI]Engineering Sciences [physics], Hardware_GENERAL, law, 0103 physical sciences, MOSFET, Hardware_INTEGRATEDCIRCUITS, 0202 electrical engineering, electronic engineering, information engineering, 010302 applied physics, image sensor, Subthreshold conduction, business.industry, 020208 electrical & electronic engineering, Transistor, Electrical engineering, photo-receptor, cmos circuit, Noise floor, CMOS, business, Low voltage, low-noise, Hardware_LOGICDESIGN
Abstract

This paper presents the design of a low-power and low-noise CMOS photo-transduction circuit. We propose to use the new technique of composite transistors for noise reduction of photoreceptor in the subthreshold by exploiting the small size effects of CMOS transistors. Several power and noise optimizations, design requirements, and performance limitations relating to the CMOS photoreceptor are presented. This new structure with composite transistors ensures low noise and low power consumption. The CMOS photoreceptor, implemented in a 130 nm standard CMOS technology with a 1.2 V supply voltage, achieves a noise floor of 2μV/⎷Hz within the frequency range from 1 Hz to 10 kHz. The current consumption of the CMOS photoreceptor is 541 nA. This paper shows the need for the design of phototransduction circuit at low voltage, low noise and how these constraints are reflected in the design of CMOS vision sensor.

Published
2019

9. Multiscale modeling of the elasto-plastic behavior of architectured and nanostructured Cu-Nb composite wires and comparison with neutron diffraction experiments

Author

Olivier Castelnau, Samuel Forest, P.O. Renault, Vincent Klosek, J.-R. Medy, Ludovic Thilly, Tang Gu, Eveline Herve-Luanco, Henry Proudhon, F. Lecouturier–dupouy, Patrick Villechaise, Centre des Matériaux (MAT), MINES ParisTech - École nationale supérieure des mines de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Procédés et Ingénierie en Mécanique et Matériaux (PIMM), Conservatoire National des Arts et Métiers [CNAM] (CNAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM), Institut Pprime (PPRIME), Université de Poitiers-ENSMA-Centre National de la Recherche Scientifique (CNRS), Laboratoire Léon Brillouin (LLB - UMR 12), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Saclay, HESAM Université (HESAM), Laboratoire d'Ingénierie des Systèmes de Versailles (LISV), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Laboratoire national des champs magnétiques intenses - Grenoble (LNCMI-G ), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Centre National de la Recherche Scientifique (CNRS)-PSL Research University (PSL)-MINES ParisTech - École nationale supérieure des mines de Paris, Procédés et Ingénierie en Mécanique et Matériaux [Paris] (PIMM), Arts et Métiers ParisTech, HESAM Université (HESAM)-HESAM Université (HESAM)-Conservatoire National des Arts et Métiers [CNAM] (CNAM)-Centre National de la Recherche Scientifique (CNRS), Université de Poitiers-Centre National de la Recherche Scientifique (CNRS)-ENSMA, Association EURATOM-CEA (CEA/DSM/DRFC), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire national des champs magnétiques intenses - Grenoble (LNCMI), Université Joseph Fourier - Grenoble 1 (UJF)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Conservatoire National des Arts et Métiers [CNAM] (CNAM), HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, Université Grenoble Alpes (UGA), Physique des Défauts et de la Plasticité PDP (PDP), Département Physique et Mécanique des Matériaux (Département Physique et Mécanique des Matériaux), Université de Poitiers-ENSMA-Centre National de la Recherche Scientifique (CNRS)-Université de Poitiers-ENSMA-Centre National de la Recherche Scientifique (CNRS)-Institut Pprime (PPRIME), Université de Poitiers-ENSMA-Centre National de la Recherche Scientifique (CNRS)-Université de Poitiers-ENSMA-Centre National de la Recherche Scientifique (CNRS), ENDOmmagement et durabilité ENDO (ENDO), Centre des Matériaux (CDM), Mines Paris - PSL (École nationale supérieure des mines de Paris), HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-Centre National de la Recherche Scientifique (CNRS)-Arts et Métiers Sciences et Technologies, HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), and Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])

Subjects
Matériaux [Sciences de l'ingénieur], Materials science, Neutron diffraction, Composite number, Niobium, chemistry.chemical_element, 02 engineering and technology, 01 natural sciences, [SPI.MAT]Engineering Sciences [physics]/Materials, [SPI]Engineering Sciences [physics], Polycrystalline material, [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], 0103 physical sciences, Ultimate tensile strength, Elasto-plasticity, Multiscale modeling, General Materials Science, Composite material, 010302 applied physics, Homogenization, Mechanical Engineering, [SPI.MECA]Engineering Sciences [physics]/Mechanics [physics.med-ph], 021001 nanoscience & nanotechnology, Microstructure, Finite element method, chemistry, Mechanics of Materials, Severe plastic deformation, Copper niobium wire, 0210 nano-technology
Abstract

International audience; Nanostructured and architectured copper niobium composite wires are excellent candidates for the generation of intense pulsed magnetic fields (∼100T) as they combine both high strength and high electrical conductivity. Multi-scaled Cu-Nb wires are fabricated by accumulative drawing and bundling (a severe plastic deformation technique), leading to a multiscale, architectured, and nanostructured microstructure exhibiting a strong fiber crystallographic texture and elongated grain shape along the wire axis. This paper presents a comprehensive study of the effective elasto-plastic behavior of this composite material by using two different approaches to model the microstructural features: full-field finite elements and mean-field modeling. As the material exhibits several characteristic scales, an original hierarchical strategy is proposed based on iterative scale transition steps from the nanometric grain scale to the millimetric macro-scale. The best modeling strategy is selected to estimate reliably the effective elasto-plastic behavior of Cu-Nb wires with minimum computational time. Finally, for the first time, the models are confronted to tensile tests and in-situ neutron diffraction experimental data with a good agreement.

Published
2019

10. Exploring network distances for movies comparison

Author

Majda Lafhel, hocine cherifi, Mohammed Hassouni, Université Mohammed V de Rabat [Agdal], Laboratoire d'Electronique, d'Informatique et d'Image [EA 7508] (Le2i), Université de Technologie de Belfort-Montbeliard (UTBM)-Université de Bourgogne (UB)-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement-Centre National de la Recherche Scientifique (CNRS), and Cherifi, Hocine

Subjects
[INFO.INFO-CV] Computer Science [cs]/Computer Vision and Pattern Recognition [cs.CV], [INFO.INFO-SI] Computer Science [cs]/Social and Information Networks [cs.SI], [INFO.INFO-CV]Computer Science [cs]/Computer Vision and Pattern Recognition [cs.CV], [INFO]Computer Science [cs], [INFO] Computer Science [cs], ComputingMilieux_MISCELLANEOUS, [INFO.INFO-SI]Computer Science [cs]/Social and Information Networks [cs.SI]
Abstract

International audience

Published
2021

11. Identification of local contact angle distribution inside a porous medium from an inverse optimization procedure

Author

Didier Lasseux, Marc Prat, Otman Maalal, René Peinador, Bordeaux INP - BINP (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), Arts et Métiers Sciences et Technologies - ENSAM (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Institut national de recherche pour l'agriculture, l'alimentation et l'environnement - INRAE (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université de Bordeaux (FRANCE), Institut de Mécanique et d'Ingénierie de Bordeaux (I2M), Institut National de la Recherche Agronomique (INRA)-Université de Bordeaux (UB)-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS), and PEMFC – SUDOE' – SOE1/P1/E0293

Subjects
[PHYS.PHYS.PHYS-FLU-DYN]Physics [physics]/Physics [physics]/Fluid Dynamics [physics.flu-dyn], Capillary pressure, Materials science, Mécanique des fluides, Computational Mechanics, Displacement of immiscible fluids, Flows in porous mediaPorous media, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, Capillary pressure curve, Relative permeability curve, Physics::Geophysics, Contact angle, [SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering, Porous Media, [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph], Porosity, ComputingMilieux_MISCELLANEOUS, Network model, Fluid Flow and Transfer Processes, Quantitative Biology::Biomolecules, [SPI.FLUID]Engineering Sciences [physics]/Reactive fluid environment, Pore network model, Mechanics, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Hill climbing algorithm, Mixed wettability, Genetic algorithm, Modeling and Simulation, Wetting, 0210 nano-technology, Relative permeability, Porous medium, Hill climbing
Abstract

The local contact angle distribution within the pore space of a porous medium of mixed wettability is identified by combining pore network simulations and an optimization method. The latter is used to solve the inverse problem consisting of determining the local contact angle distribution from the capillary pressure and relative permeability curves. The inverse optimization method combines a genetic algorithm and the hill-climbing algorithm. The method is illustrated considering a Boolean distribution of the local contact angle in which the pore bodies and throats in the pore space are either hydrophilic or hydrophobic.

Published
2021

12. Contactless thermal profilometry of carbon-resin materials by IR thermography

Author

Emmanuelle Abisset-Chavanne, Christophe Pradere, Jean-Christophe Batsale, M.M. Groz, A. Meziane, Alain Sommier, S. Chevalier, Institut de Mécanique et d'Ingénierie (I2M), Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM), Institut de Mécanique et d'Ingénierie de Bordeaux (I2M), Institut National de la Recherche Agronomique (INRA)-Université de Bordeaux (UB)-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, and HESAM Université (HESAM)-HESAM Université (HESAM)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS)

Subjects
Ir thermography, Materials science, business.industry, Applied Mathematics, Bilayer, Interface (computing), 020208 electrical & electronic engineering, 010401 analytical chemistry, chemistry.chemical_element, 02 engineering and technology, Condensed Matter Physics, 01 natural sciences, 0104 chemical sciences, [SPI]Engineering Sciences [physics], chemistry, Thermal, 0202 electrical engineering, electronic engineering, information engineering, Optoelectronics, Profilometer, Electrical and Electronic Engineering, business, Instrumentation, Carbon, ComputingMilieux_MISCELLANEOUS
Abstract

In this paper, we addressed the problem of quantitatively measuring the profile of bilayer media. A contactless thermal profilometry method is proposed. Concretely, this approach corresponds to measuring the interface between two media of a material. An experimental setup is proposed, and a methodology is presented to estimate the profile . Two examples, one numerical and one experimental, are presented in order to validate the method.

Published
2021

13. UPSCALED MODEL FOR NON-STEADY INERTIAL FLOW IN HOMOGENEOUS POROUS MEDIA

Author

Didier Lasseux, Francisco Valdés-Parada, Fabien Bellet, Institut de Mécanique et d'Ingénierie de Bordeaux (I2M), Institut National de la Recherche Agronomique (INRA)-Université de Bordeaux (UB)-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS), and Lasseux, Didier

Subjects
Porous media equation, [SPI.FLUID]Engineering Sciences [physics]/Reactive fluid environment, Averaging and homogenization, [PHYS.MECA.MEFL] Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph], [SPI.FLUID] Engineering Sciences [physics]/Reactive fluid environment, [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph]
Abstract

International audience; A macroscopic model for non-steady and inertial one-phase incompressible flow in rigid porous media is presented using an upscaling technique. The resulting model is non-local in time and involves two effective coefficients, namely, a dynamic apparent permeability tensor and a vector accounting for the time-decaying influence of the flow initial condition. Ancillary closure problems are provided, which allow computing the effective coefficients. Symmetry and positiveness analyses of the apparent permeability are carried out. The performance of the macroscopic model for different macroscopic forcing is examined along with validation with direct numerical simulations. It is shown that the purely heuristic classical model, consisting in a Darcy-like model complemented with an accumulation term on the filtration velocity, is not appropriate.

Published
2021

14. Myocardial Infarction Quantification from Late Gadolinium Enhancement MRI Using Top-Hat Transforms and Neural Networks

Author

de La Rosa, Ezequiel, Sidibé, Désiré, Decourselle, Thomas, Leclercq, Thibault, Cochet, Alexandre, Lalande, Alain, Laboratoire d'Electronique, d'Informatique et d'Image [EA 7508] (Le2i), Université de Technologie de Belfort-Montbeliard (UTBM)-Université de Bourgogne (UB)-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement-Centre National de la Recherche Scientifique (CNRS), Technische Universität Munchen - Université Technique de Munich [Munich, Allemagne] (TUM), Icometrix [Leuven], Service de Cardiologie [CHU de Dijon], Centre Hospitalier Universitaire de Dijon - Hôpital François Mitterrand (CHU Dijon), and université de Bourgogne, IMVIA

Subjects
FOS: Computer and information sciences, scar segmentation, late gadolinium enhancement, Industrial engineering. Management engineering, Computer Vision and Pattern Recognition (cs.CV), Electronic computers. Computer science, [INFO.INFO-IM] Computer Science [cs]/Medical Imaging, Computer Science - Computer Vision and Pattern Recognition, [INFO.INFO-IM]Computer Science [cs]/Medical Imaging, deep learning, QA75.5-76.95, T55.4-60.8, cardiac magnetic resonance
Abstract

Significance: Late gadolinium enhanced magnetic resonance imaging (LGE-MRI) is the gold standard technique for myocardial viability assessment. Although the technique accurately reflects the damaged tissue, there is no clinical standard for quantifying myocardial infarction (MI), demanding most algorithms to be expert dependent. Objectives and Methods: In this work a new automatic method for MI quantification from LGE-MRI is proposed. Our novel segmentation approach is devised for accurately detecting not only hyper-enhanced lesions, but also microvascular-obstructed areas. Moreover, it includes a myocardial disease detection step which extends the algorithm for working under healthy scans. The method is based on a cascade approach where firstly, diseased slices are identified by a convolutional neural network (CNN). Secondly, by means of morphological operations a fast coarse scar segmentation is obtained. Thirdly, the segmentation is refined by a boundary-voxel reclassification strategy using an ensemble of CNNs. For its validation, reproducibility and further comparison against other methods, we tested the method on a big multi-field expert annotated LGE-MRI database including healthy and diseased cases. Results and Conclusion: In an exhaustive comparison against nine reference algorithms, the proposal achieved state-of-the-art segmentation performances and showed to be the only method agreeing in volumetric scar quantification with the expert delineations. Moreover, the method was able to reproduce the intra- and inter-observer variability ranges. It is concluded that the method could suitably be transferred to clinical scenarios., Comment: Submitted to IEEE

Published
2021

15. A generalized high-order momentum preserving (HOMP) method in the one-fluid model for incompressible two phase flows with high density ratio

Author

Florian Desmons, Mathieu Coquerelle, Institut de Mécanique et d'Ingénierie (I2M), Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM), Institut de Mécanique et d'Ingénierie de Bordeaux (I2M), Institut National de la Recherche Agronomique (INRA)-Université de Bordeaux (UB)-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS), Université de Bordeaux (UB), and Institut Polytechnique de Bordeaux (Bordeaux INP)

Subjects
Physics and Astronomy (miscellaneous), Momentum, Computer science, Computation, Two phase flows, Navier-Stokes, 010103 numerical & computational mathematics, [INFO.INFO-DM]Computer Science [cs]/Discrete Mathematics [cs.DM], Numerical method, 01 natural sciences, [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph], [SPI.MAT]Engineering Sciences [physics]/Materials, Consistent transport, Volume of fluid method, Applied mathematics, [MATH.MATH-AP]Mathematics [math]/Analysis of PDEs [math.AP], 0101 mathematics, High-order method, Numerical Analysis, Finite volume method, Applied Mathematics, Numerical analysis, Computer Science Applications, 010101 applied mathematics, Moment (mathematics), Computational Mathematics, Continuity equation, Modeling and Simulation, Compressibility
Abstract

International audience; Numerical methods for the simulation of two-phase flows based on the common one-fluid model suffer from important transfer of momentum between the two-phases when the density ratio becomes important, such as with common air and water. This problem has been addressed from various numerical frameworks. It principally arises from the hypothesis that the momentum equation can be simplified by subtracting the continuity equation to it. While this approach is correct in a continuous point of view, it however brings numerical errors at the discrete level, from both spatial and temporal points of view, errors that can highly deteriorate the fluids dynamic. Moreover, we have found this problem to be more and more present as the grid is refined. To correct this problem, we propose a High-Order Momentum Preserving (HOMP) method that is, additionally, independent on the interface representation (may it be level set, volume of fluid, etc.). Furthermore, HOMP can be easily implemented in an existing finite volume code. We show that this method permits to efficiently suppress dreadful momentum transfers at the interface on demonstrating examples. We also present how it enhances the quality of two-phase flows computation through the simulation of the dynamic of a breaking wave and the impact of a droplet in a liquid pool. Highlights • A consistent spatial and temporal numerical strategy is used for moment preservation. • A generic formulation makes it suitable for various interface methods in 2D and 3D. • The method drastically reduces spurious momentum transfers across the interface. • Stable and accurate incompressible two phase flows complex simulations are performed. • High-order WENO 5, 3 with RK 2 scheme is employed even with thin interface thickness.

Published
2021

16. Development of differently determined and differently targeted Cave Environment Protection Perimeters using hydrogeological basis

Author

S. Mateo, N. Houillon, Nathalie Fourment, Philippe Malaurent, J. D. Villanueva, Alain Denis, Roland Lastennet, Nicolas Peyraube, F. Naessens, Institut de Mécanique et d'Ingénierie de Bordeaux (I2M), Institut National de la Recherche Agronomique (INRA)-Université de Bordeaux (UB)-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS), Service National d'Observation sur le KARST (SNO Karst), Institut national des sciences de l'Univers (INSU - CNRS), Instituto Nacional de Técnica Aeroespacial (INTA), Génie des procédés frigorifiques pour la sécurité alimentaire et l'environnement (UR FRISE), Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Centre de Recherche et d'Innovation sur le Sport (EA647) (CRIS), Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon

Subjects
Watershed, Resource (biology), Water flow, 0208 environmental biotechnology, Soil Science, 02 engineering and technology, 010501 environmental sciences, 01 natural sciences, Cave, Environmental Chemistry, [SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology, [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, environment, 0105 earth and related environmental sciences, Earth-Surface Processes, Water Science and Technology, Global and Planetary Change, geography, geography.geographical_feature_category, Hydrogeology, CEPP, Geology, 15. Life on land, Pollution, 020801 environmental engineering, Infiltration (hydrology), Environmental science, Water resource management, Groundwater
Abstract

International audience; Conserving a cave with important historical and archeological artifacts needs protection measures. Cave Environment Protection Perimeters (CEPP) operational framework is proposed as a conservation measure tool for the cave and its environment. In this study, Cussac Cave was examined. Water infiltration is the main identified threat as it can bring pollutants into the cave. Three nested CEPP zones were then identified covering three important resource safeguarding intentions. First is on determining the possible water path infiltration through fractures from surface to cave (CEPP 1). Second is on delineating watershed of water that can infiltrate above the cave after run-off (CEPP 2). And third is on determining the limits that can constrain groundwater circulation (CEPP 3). According to the objective, the CEPP were obtained using a combination of classical tools such as geomorphology, topography, hydrological parameters (water flow and chemistry), and artificial tracing. The immediate CEPP 1 is close and is small in size (0.5 km2) which can be prone to both chronic and acute pollution through direct infiltration above the cave. The hydrologic CEPP 2 is medium size (1.1 km2) which can entail risks concerning chronic and acute pollution that can be brought by surface run-off before infiltration. The hydrogeologic CEPP 3 is the largest of the three (3.9 km2). Recommendations in each zone on how to manage the cave environment are presented.

Published
2021

17. 3D reconstruction of mirror-like surfaces by smart deflectometry

Author

David Fofi, Olivier Aubreton, Lisa Poirier-Herbeck, Equipe VIBOT - VIsion pour la roBOTique [ImViA EA7535 - ERL CNRS 6000] (VIBOT), Centre National de la Recherche Scientifique (CNRS)-Imagerie et Vision Artificielle [Dijon] (ImViA), Université de Bourgogne (UB)-Université de Bourgogne (UB), Laboratoire d'Electronique, d'Informatique et d'Image [EA 7508] (Le2i), Université de Technologie de Belfort-Montbeliard (UTBM)-Université de Bourgogne (UB)-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement-Centre National de la Recherche Scientifique (CNRS), Laboratoire Electronique, Informatique et Image [UMR6306] (Le2i), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Arts et Métiers (ENSAM), and HESAM Université (HESAM)-HESAM Université (HESAM)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement

Subjects
mirror-like, business.industry, Computer science, deflectometry, 3D reconstruction, ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION, [INFO.INFO-CV]Computer Science [cs]/Computer Vision and Pattern Recognition [cs.CV], 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, 010309 optics, Optics, 0103 physical sciences, specular, 0210 nano-technology, business, ComputingMethodologies_COMPUTERGRAPHICS
Abstract

International audience; Specular and mirror-like surfaces are difficult to reconstruct by the fact that light of the surrounding environment is reflected off the surface. Nowadays, it is still a challenge in many application fields to get a fast and accurate reconstruction of specular objects. 3D acquisition by deflectometry involves estimating the 3D profile of a specular surface by analyzing the image of a light source or a pattern captured by a camera after reflection on the surface. These techniques require the knowledge of the location and the orientation of the camera and the orientation of the light source. If camera calibration is a process widely known and controlled and guaranteeing good accuracy, estimating the orientation of the light source is still an issue. We propose to overcome it by using a light source whose the color changes according to the orientation. Indeed, we implement a vision system of light source's position recognition by the color in simulation with the 3D computer graphics software Blender, we define a calibration technique and we suggest some possible light sources to export our simulated vision system to reality. Plus, we explore the potential benefit of light field in order to model such a system.

Published
2021

18. In situ synchrotron ultrasonic fatigue testing device for 3D characterisation of internal crack initiation and growth

Author

Nicolas Saintier, Mohamed El May, Arnaud Junet, Andrew King, Anne Bonnin, Yves Gaillard, Nicolas Ranc, Thierry Palin-Luc, Jean-Yves Buffiere, Yves Nadot, Alexandre Messager, Unité de recherche Maladies Métaboliques et Micronutriments (U3M), Institut National de la Recherche Agronomique (INRA), Institut de Mécanique et d'Ingénierie de Bordeaux (I2M), Institut National de la Recherche Agronomique (INRA)-Université de Bordeaux (UB)-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS), Matériaux, ingénierie et science [Villeurbanne] (MATEIS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA), Laboratoire de Mécanique des Systèmes et des Procédés (LMSP), Centre National de la Recherche Scientifique (CNRS), European Synchrotron Radiation Facility (ESRF), Systèmes de Référence Temps Espace (SYRTE), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), ENDOmmagement et durabilité ENDO (ENDO), Département Physique et Mécanique des Matériaux (Département Physique et Mécanique des Matériaux), Institut Pprime (PPRIME), Université de Poitiers-ENSMA-Centre National de la Recherche Scientifique (CNRS)-Université de Poitiers-ENSMA-Centre National de la Recherche Scientifique (CNRS)-Institut Pprime (PPRIME), Université de Poitiers-ENSMA-Centre National de la Recherche Scientifique (CNRS)-Université de Poitiers-ENSMA-Centre National de la Recherche Scientifique (CNRS), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), ENSMA-Centre National de la Recherche Scientifique (CNRS)-Université de Poitiers-ENSMA-Centre National de la Recherche Scientifique (CNRS)-Université de Poitiers-Institut Pprime (PPRIME), ENSMA-Centre National de la Recherche Scientifique (CNRS)-Université de Poitiers-ENSMA-Centre National de la Recherche Scientifique (CNRS)-Université de Poitiers, École Nationale Supérieure d'Arts et Métiers (ENSAM), HESAM Université (HESAM)-HESAM Université (HESAM)-Institut Polytechnique de Bordeaux-Institut National de la Recherche Agronomique (INRA)-Centre National de la Recherche Scientifique (CNRS)-Université de Bordeaux (UB), Université de Poitiers-Centre National de la Recherche Scientifique (CNRS)-ENSMA-Université de Poitiers-Centre National de la Recherche Scientifique (CNRS)-ENSMA-Institut Pprime (PPRIME), and Université de Poitiers-Centre National de la Recherche Scientifique (CNRS)-ENSMA-Université de Poitiers-Centre National de la Recherche Scientifique (CNRS)-ENSMA

Subjects
Ultrasonic fatigue testing, In situ, Matériaux [Sciences de l'ingénieur], Cracks, Materials science, education, 0211 other engineering and technologies, 02 engineering and technology, Fatigue testing, [SPI.MAT]Engineering Sciences [physics]/Materials, law.invention, 0203 mechanical engineering, law, Ability testing, General Materials Science, Composite material, Plastic deformation, Tomography, health care economics and organizations, Ultrasonic testing, 021101 geological & geomatics engineering, In-situ synchrotrons, Short fatigue cracks, Synchrotron radiation, Initiation and propagation, Crack propagation, Mechanical Engineering, Casting defect, Fracture mechanics, Aluminum alloys, Synchrotron, Very high cycle fatigue, 020303 mechanical engineering & transports, Mechanics of Materials, Casting (metalworking), Crack initiation, Internal shorts, aluminum alloy - fatigue test - internal short crack growth - synchrotron radiation - X-ray tomography, X-ray tomography, Fatigue of materials, Synchrotrons, Ultrasonic fatigue
Abstract

cited By 0; International audience; This work presents a new ultrasonic fatigue testing device for studying the initiation and propagation mechanisms of internal microstructurally short fatigue cracks using in situ synchrotron tomography. Its principle is described as well as the method used for automatically detecting crack initiation and its subsequent growth. To promote internal crack initiation, specimens containing internal casting defects were tested between the high cycle and very high cycle fatigue regimes (107-109 cycles). Preliminary results show the ability of this new device to initiate an internal microstructurally short crack in a reasonable testing time and monitor its growth. © 2019 Wiley Publishing Ltd.

Published
2019

19. Automatic Assessment of Depression Based on Visual Cues: A Systematic Review

Author

Kostas Marias, Fan Yang, Manolis Tsiknakis, Anastasia Pampouchidou, Panagiotis G. Simos, Matthew Pediaditis, Fabrice Meriaudeau, Laboratoire Electronique, Informatique et Image ( Le2i ), Université de Bourgogne ( UB ) -AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement-Centre National de la Recherche Scientifique ( CNRS ), University of Crete School of medicine, Institute of Computer Science ( ICS-FORTH ), Foundation for Research and Technology - Hellas ( FORTH ), SRI International [Menlo Park] ( SRI ), Laboratoire Electronique, Informatique et Image [UMR6306] (Le2i), Université de Bourgogne (UB)-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement-Centre National de la Recherche Scientifique (CNRS), Institute of Computer Science (ICS-FORTH), Foundation for Research and Technology - Hellas (FORTH), Department of Informatics Engineering, School of Engineering [TEI of Crete], Technological Educational Institute of Crete, Centre for Intelligent Signal and Imaging Research [Petronas] (CISIR), Universiti Teknologi PETRONAS (UTP), Greek Ministry of Development-GSRT, European Project: 611516,SEMEOTICONS, HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement-Centre National de la Recherche Scientifique (CNRS), Institute of Computer Science [FORTH, Heraklion] (ICS-FORTH), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Arts et Métiers (ENSAM), and HESAM Université (HESAM)-HESAM Université (HESAM)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement

Subjects
Monitoring, Rating-Scale, Remission, Computer science, Performance, Feature extraction, ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION, 02 engineering and technology, Adolescents, computer.software_genre, Tools, Attentional Bias, [SPI]Engineering Sciences [physics], 03 medical and health sciences, 0302 clinical medicine, Dynamic-Analysis, Mood, Diagnosis, Disorder, [ SPI ] Engineering Sciences [physics], 0202 electrical engineering, electronic engineering, information engineering, affective computing, Affective computing, Sensory cue, ComputingMilieux_MISCELLANEOUS, Visualization, Facial expression, Data collection, Contextual image classification, business.industry, Dimensionality reduction, facial image analysis, Reliability, Europe, Facial Expression, Human-Computer Interaction, machine learning, Depression assessment, 020201 artificial intelligence & image processing, Artificial intelligence, business, computer, 030217 neurology & neurosurgery, Software, Natural language processing
Abstract

International audience; Automatic depression assessment based on visual cues is a rapidly growing research domain. The present exhaustive review of existing approaches as reported in over sixty publications during the last ten years focuses on image processing and machine learning algorithms. Visual manifestations of depression, various procedures used for data collection, and existing datasets are summarized. The review outlines methods and algorithms for visual feature extraction, dimensionality reduction, decision methods for classification and regression approaches, as well as different fusion strategies. A quantitative meta-analysis of reported results, relying on performance metrics robust to chance, is included, identifying general trends and key unresolved issues to be considered in future studies of automatic depression assessment utilizing visual cues alone or in combination with vocal or verbal cues.Visualization; Affective computing; Monitoring; Europe; Mood; Reliability; Tools; Depression assessment; affective computing; facial expression; machine learning; facial image analysis

Published
2019

20. On the exhaustive generation of generalized ballot sequences in lexicographic and Gray code order

Author

Ahmad Sabri, Vincent Vajnovszki, Laboratoire Electronique, Informatique et Image [UMR6306] (Le2i), Université de Bourgogne (UB)-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Informatique de Bourgogne [Dijon] (LIB), Université de Bourgogne (UB), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Arts et Métiers (ENSAM), and HESAM Université (HESAM)-HESAM Université (HESAM)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement

Subjects
Computer science, 010102 general mathematics, 0102 computer and information sciences, [INFO.INFO-DM]Computer Science [cs]/Discrete Mathematics [cs.DM], Lexicographical order, 01 natural sciences, Gray code, Ballot, 010201 computation theory & mathematics, Order (business), [MATH.MATH-CO]Mathematics [math]/Combinatorics [math.CO], 0101 mathematics, Arithmetic, ComputingMilieux_MISCELLANEOUS
Abstract

A generalized (resp. p-ary) ballot sequence is a sequence over the set of non-negative integers (resp. integers less than p) where in any of its prefixes each positive integer i occurs at most as often as any integer less than i. We show that the Reected Gray Code order induces a cyclic 3-adjacent Gray code on both, the set of fixed length generalized ballot sequences and p-ary ballot sequences when p is even, that is, ordered list where consecutive sequences (regarding the list cyclically) differ in at most 3 adjacent positions. Non-trivial efficient generating algorithms for these ballot sequences, in lexicographic order and for the obtained Gray codes, are also presented.

Published
2019

21. Advanced separated spatial representations for hardly separable domains

Author

Francisco Chinesta, Jean Louis Duval, Emmanuelle Abisset, Elías Cueto, Chady Ghnatios, Amine Ammar, Notre Dame University-Louaize [Lebanon] (NDU), Institut de Mécanique et d'Ingénierie de Bordeaux (I2M), Institut National de la Recherche Agronomique (INRA)-Université de Bordeaux (UB)-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS), Laboratoire Angevin de Mécanique, Procédés et InnovAtion (LAMPA), Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM), University of Zaragoza - Universidad de Zaragoza [Zaragoza], ESI Group (ESI Group), Laboratoire Procédés et Ingénierie en Mécanique et Matériaux (PIMM), Conservatoire National des Arts et Métiers [CNAM] (CNAM)-Arts et Métiers Sciences et Technologies, Laboratoire Arts et Métiers ParisTech - Ecoulements Complexes Photonique et Surfaces (LAMPA-ECPS), École Nationale Supérieure d'Arts et Métiers (ENSAM), Procédés et Ingénierie en Mécanique et Matériaux [Paris] (PIMM), Conservatoire National des Arts et Métiers [CNAM] (CNAM)-École Nationale Supérieure d'Arts et Métiers (ENSAM), and HESAM Université (HESAM)-HESAM Université (HESAM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Computer science, Computational Mechanics, General Physics and Astronomy, PGD, Space separated representation, Parametric modeling, 02 engineering and technology, Sciences de l'ingénieur, 01 natural sciences, Separable space, law.invention, [SPI]Engineering Sciences [physics], 0203 mechanical engineering, law, Simple (abstract algebra), Compression (functional analysis), Singular value decomposition, Cartesian coordinate system, 0101 mathematics, Representation (mathematics), Parametric statistics, Mechanical Engineering, Computer Science Applications, 010101 applied mathematics, 020303 mechanical engineering & transports, Mechanics of Materials, Parametric model, Algorithm
Abstract

International audience; This work aims at proposing a new procedure for parametric problems whose separated representation has been considered difficult, or whose SVD compression impacted the results in terms of performance and accuracy. The proposed technique achieves a fully separated representation for layered domains with interfaces exhibiting waviness or – more generally – deviating from planar surfaces, parallel to the coordinate plane. This will make possible a simple separated representation, equivalent to others, already analyzed in some of our former works. To prove the potentialities of the proposed approach, two benchmarks will be addressed, one of them involving an efficient space–time separated representation achieved by considering the same rationale.

Published
2019

22. Development of a new LiBr/LiOH-based alloy for thermal energy storage

Author

Jean Toutain, Stanislav Pechev, Elena Palomo Del Barrio, Eric Lebraud, Fouzia Achchaq, Institut de Mécanique et d'Ingénierie de Bordeaux (I2M), Institut National de la Recherche Agronomique (INRA)-Université de Bordeaux (UB)-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS), CICEnergigune, Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), ANR-16-CE06-0012,Pc2TES,Composés péritectiques pour le stockage compact de l'énergie thermique à haute température(2016), École Nationale Supérieure d'Arts et Métiers (ENSAM), HESAM Université (HESAM)-HESAM Université (HESAM)-Institut Polytechnique de Bordeaux-Institut National de la Recherche Agronomique (INRA)-Centre National de la Recherche Scientifique (CNRS)-Université de Bordeaux (UB), and Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS)

Subjects
Energy storage, Materials science, LiBr/LiOH phase diagram, Alloy, Thermodynamics, 02 engineering and technology, engineering.material, 010402 general chemistry, Thermal energy storage, 7. Clean energy, 01 natural sciences, Differential scanning calorimetry, General Materials Science, Thermal analysis, Peritectic compound, Phase diagram, [CHIM.MATE]Chemical Sciences/Material chemistry, General Chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Thermodynamic property, 0104 chemical sciences, 13. Climate action, Energy density, engineering, 0210 nano-technology, Powder diffraction
Abstract

International audience; In this study, the LiBr/LiOH phase diagram and the key related thermodynamic properties of its specific compounds were theoretically and experimentally estimated (by thermodynamic modeling and differential scanning calorimetry experiments, respectively) and compared with previously reported results. The peritectic compound Li4Br(OH)3 was identified as a highly promising candidate for heat storage applications at around 300 °C, mainly because of its outstanding energy density. As a precaution, the two limiting cases of thermodynamic solidification simulations (equilibrium and Scheil–Gulliver cooling conditions) were considered to confirm the relevance of synthesizing and experimentally studying this new potential heat storage material. After many tests and adjustments, a suitable synthesis protocol was developed and validated for characterizing the Li4Br(OH)3 compound using the X-ray powder diffraction technique. Preliminary thermal analysis was also performed for the successfully synthesized peritectic compound to confirm its high potential as a heat storage material. Our results indicate that it would be useful to comprehensive analyze the thermophysical properties of this material to assess its capacity for utilization in thermal energy storage applications.

Published
2019

23. Added Masses of generic shape bodies interacting with external walls

Author

Giovanni Carbone, Guillaume Martinat, Jean-Luc Harion, Dominique Farcy, FLYING WHALES, Laboratoire de Mécanique des Fluides de Lille – Kampé de Fériet - UMR 9014 (LMFL), Centrale Lille-ONERA-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM), Ecole nationale supérieure Mines-Télécom Lille Douai (IMT Lille Douai), Institut Mines-Télécom [Paris] (IMT), Laboratoire de Mécanique des Fluides de Lille – Kampé de Fériet (LMFL), Ecole Centrale de Lille-ONERA-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), IMT Lille Douai, Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), and HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)

Subjects
[PHYS]Physics [physics], Physics, Surface (mathematics), 0209 industrial biotechnology, DIRIGEABLES, Inertial frame of reference, Discretization, MASSE AJOUTÉE, Aerospace Engineering, 02 engineering and technology, Mechanics, 01 natural sciences, 010305 fluids & plasmas, [SPI]Engineering Sciences [physics], Matrix (mathematics), 020901 industrial engineering & automation, ADDED MASSES, AIRSHIPS, Volume (thermodynamics), Approximation error, Simple (abstract algebra), 0103 physical sciences, BOUNDARY ELEMENT METHOD, Boundary element method, EXTERNAL WALL INTERACTION
Abstract

International audience; The aim of this paper is to propose an efficient method to evaluate the Added Masses of generic shape bodies in infinite fluid or in the proximity of external walls. The Added Masses (AM) are the result of the inertial reaction of the fluid in response to an accelerated movement of a body immersed in it. The AM effects are more evident when the body density is similar to that of the surrounding fluid, as in the case of airships. In the takeoff or landing phases, the proximity to the ground causes an increase in the Added Masses that must be correctly estimated to properly size the airship controls. In our method, the calculation of the Added Masses matrix is carried out by the Boundary Element Method (BEM). To verify the accuracy of the results, the study cases are based on simple shapes, whose Added Masses are well known. The analyses in infinite fluid and in the presence of a flat wall are carried out. Numerical results are compared to the theoretical values found in literature. The calculated Added Masses are intrinsically dependent on the mesh definition and the relative error, referred to the theoretical values, depends on the surface and volume discretiza-tion. In the case of interaction between geometries with complex shapes, the influence on the Added Masses is very difficult to predict without a numerical approach. The method proposed gives a good compromise in terms of quality of results and computational cost.

Published
2019

24. Received 26 October 2018; Received in revised form 21 January 2019; Accepted 11 February 2019

Author

PESSARD, Etienne, VAYSSETTE, Bastien, SAINTIER, Nicolas, BRUGGER, Charles, EL MAY, Mohamed, Institut de Mécanique et d'Ingénierie de Bordeaux (I2M), Institut National de la Recherche Agronomique (INRA)-Université de Bordeaux (UB)-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS), Laboratoire Angevin de Mécanique, Procédés et InnovAtion (LAMPA), Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Centre National de la Recherche Scientifique (CNRS)-Arts et Métiers Sciences et Technologies, and HESAM Université (HESAM)-HESAM Université (HESAM)-Institut Polytechnique de Bordeaux-Université de Bordeaux (UB)

Subjects
Materials science, Additive manufacturing, 02 engineering and technology, Surface finish, Industrial and Manufacturing Engineering, [SPI]Engineering Sciences [physics], 0203 mechanical engineering, Machining, Hot isostatic pressing, Residual stress, Surface modelling, Surface roughness, Titanium alloys, General Materials Science, Selective laser melting, Composite material, Physique, Mechanical Engineering, 021001 nanoscience & nanotechnology, Microstructure, Roughness, 020303 mechanical engineering & transports, Mechanics of Materials, Modeling and Simulation, Fatigue criteria, Profilometer, 0210 nano-technology
Abstract

Selective Laser Melting (SLM) is a powder bed fusion process which allows to build-up parts by successive addition of layers using 3D-CAD models. Among the advantages, the high degree of freedom for part design and the small loss of material explain the increasing number of Ti-6Al-4V parts obtained by this process. However, right after additive manufacturing, these parts contain defects (surface roughness, porosity, residual stresses) which significantly decrease the High Cycle Fatigue (HCF) life. In order to minimize the porosity and residual stresses, post-processing treatments like Hot Isostatic Pressing (HIP) and Stress Relieving (SR) are often conducted. But the reduction of the surface roughness by machining is very costly and not always possible, especially for parts with complex geometry. The aim of this work is to evaluate the effect of the surface roughness of Ti-6Al-4V parts produced by SLM on the HCF behavior and to propose a methodology to estimate this effect. Three sets of specimens were tested in tension-compression: Hot-Rolled (reference); SLM HIP machined; SLM HIP as-built. For each condition, microstructure characterization, observation of the fracture surface of broken specimens, surface analysis and volume analysis were carried out respectively by Optical Microscope (OM), Scanning Electron Microscope (SEM), 3D optical profilometer and 3D X-ray tomograph. Results of fatigue testing show a significant decrease of the HCF life mainly due to the surface roughness. Along with experimental testing, numerical simulations using FEM were conducted using the surface scans obtained by profilometry and tomography. Based on extreme values statistics of a non-local fatigue indicator parameter (FIP), a methodology is proposed to take into account the effect of the surface roughness on the HCF life. Arts et Metiers Paristech, I2M, CNRS, Talence 33400, France Arts et Metiers Paristech, LAMPA, Angers 49035, France

Published
2019

25. High frequency characterization of a sweeping jet actuator

Author

Laurent Keirsbulck, Quentin Gallas, Jérôme Delva, Marc Lippert, Célestin Ott, Laboratoire d'Automatique, de Mécanique et d'Informatique industrielles et Humaines - UMR 8201 (LAMIH), Université Polytechnique Hauts-de-France (UPHF)-Université Polytechnique Hauts-de-France (UPHF)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Mécanique des Fluides de Lille – Kampé de Fériet (LMFL), Ecole Centrale de Lille-ONERA-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, and HESAM Université (HESAM)-HESAM Université (HESAM)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)

Subjects
Acoustics, Nozzle, 02 engineering and technology, FLOW CONTROL, 01 natural sciences, CONDITIONAL APPROACH, [SPI]Engineering Sciences [physics], 0103 physical sciences, Electrical and Electronic Engineering, Instrumentation, SWEEPING JET, [PHYS]Physics [physics], 010302 applied physics, Physics, CONTROLE DES ECOULEMENTS, Metals and Alloys, Time resolution, Space resolution, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, SYNCHRONIZED HOT WIRE, Flow control (fluid), DYNAMIC CHARACTERIZATION, JET BALAYANT, State of art, 0210 nano-technology, Actuator
Abstract

International audience; Sweeping jets are an emerging type of actuators that have gained interest due to their potential use in flow control applications. The working principle of these devices is based on the bi-stable attachment of a jet to adjacent walls. They are able to produce unsteady blowing within a wide range of operating frequencies. Nevertheless, the state of art shows a lack of space-time characterization of these actuators for high sweeping frequencies. This paper resents a conditional approach that reconstructs the spatial dynamic response of sweeping jets for sweeping frequencies above 500 Hz. The time-dependent velocity is measured with two single-hot-wire sensors: a reference one placed at the edge of the exit nozzle, and a flying one. The method is then tested to characterize the flow at the exit nozzle of an in-house sweeping jet actuator with 1mm space resolution, and 50 µs time resolution. These measurements are performed with a sweeping frequency of 639 Hz. Overall this paper demonstrates that the conditional approach is very useful for understanding the physics of flow control actuators.; Les jets balayants sont des actionneurs fluidiques en pleine extension dans le domaine du contrôle actif des écoulements de par leur large gamme de fréquences et de vitesses. Ils se basent sur le phénomène de bi-stabilité de détachement de l'écoulement sur les parois interne de l'actionneur. Cependant la littérature montre une faiblesse pour la caractérisation expérimentale à haute fréquence de l'écoulement en sortie d'actionneur. Ce papier présente une méthode de reconstruction résolue en espace et en temps, basée sur une approche conditionnelle permettant de reconstruire l'écoulement pour des fréquence de balayage supérieures à 500Hz. Les signaux de vitesse résolus en temps sont mesurés à l'aide de deux fils chauds : un fixe pour le signal de synchronisation et un mobile, se déplaçant sur un maillage de finesse 1mm. Cette méthode est ensuite appliquée à un actionneur de jet balayant fonctionnant a une fréquence de 639Hz, avec un signal de vitesse de résolution temporelle de 50 micro secondes. Ce papier démontre ainsi que l'approche conditionnelle peut être utilisable pour comprendre la physique des écoulements en sortie d'actionneurs fluidiques.

Published
2019

26. Internet of things for sleep tracking: wearables vs. nonwearables

Author

Ibrahim Sadek, Mounir Mokhtari, Antoine Demarasse, Laboratoire Electronique, Informatique et Image [UMR6306] (Le2i), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement, Image & Pervasive Access Lab (IPAL), and National University of Singapore (NUS)-MATHEMATIQUES, SCIENCES ET TECHNOLOGIES DE L'INFORMATION ET DE LA COMMUNICATION (UJF)-Agency for science, technology and research [Singapore] (A*STAR)-Centre National de la Recherche Scientifique (CNRS)-Institute for Infocomm Research - I²R [Singapore]

Subjects
020205 medical informatics, BitTorrent tracker, Internet privacy, Population, Biomedical Engineering, Wearable computer, Excessive daytime sleepiness, Bioengineering, 02 engineering and technology, Applied Microbiology and Biotechnology, 03 medical and health sciences, 0302 clinical medicine, Quality of life, 0202 electrical engineering, electronic engineering, information engineering, medicine, 030212 general & internal medicine, education, ComputingMilieux_MISCELLANEOUS, [SDV.EE.SANT]Life Sciences [q-bio]/Ecology, environment/Health, education.field_of_study, Data collection, business.industry, Sleep (system call), medicine.symptom, Psychology, business, Mobile device, Biotechnology
Abstract

Sleep is a very significant biological function for the human being and is important to have a physical balance and a proper regime for a decent quality of life. It is very important to monitor sleep and quality of sleep, especially to older adults because they spend more time in bed compared to younger adults. Insufficient sleep for older adults might cause depression, attention and memory problems, excessive daytime sleepiness, and experience more nighttime falls. The current sleep assessments and evaluation methods are troublesome, expensive, and time-consuming. Thus, the healthcare community is seeking inexpensive and mobile devices that can support a long-term data collection and be accessible to most of the people. This is where a massive use of Internet of Things devices (wearables, low-energy sensors, beacons, apps) is playing a major shift in the quality of life of the population. This paper presents a summary of the current nonintrusive sleep tracking technologies (these include but not limited to consumer sleep trackers e.g., wearables such as bracelets; smart-watches, Mobile Apps and non-wearables such as sleep-tracking mats that can be placed under a bed mattress) and their suitability for the elderly.

Published
2019

27. Survey on semantic segmentation using deep learning techniques

Author

Fahad Lateef, Yassine Ruichek, Laboratoire Electronique, Informatique et Image [UMR6306] (Le2i), Université de Bourgogne (UB)-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, and HESAM Université (HESAM)-HESAM Université (HESAM)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement-Centre National de la Recherche Scientifique (CNRS)

Subjects
0209 industrial biotechnology, Measure (data warehouse), Computer science, business.industry, Cognitive Neuroscience, Deep learning, 02 engineering and technology, Machine learning, computer.software_genre, Computer Science Applications, Task (project management), 020901 industrial engineering & automation, Artificial Intelligence, Salient, 0202 electrical engineering, electronic engineering, information engineering, [INFO]Computer Science [cs], 020201 artificial intelligence & image processing, Segmentation, Artificial intelligence, business, Focus (optics), computer
Abstract

Semantic segmentation is a challenging task in computer vision systems. A lot of methods have been developed to tackle this problem ranging from autonomous vehicles, human-computer interaction, to robotics, medical research, agriculture and so on. Many of these methods have been built using the deep learning paradigm that has shown a salient performance. For this reason, we propose to survey these methods by, first categorizing them into ten different classes according to the common concepts underlying their architectures. Second, by providing an overview of the publicly available datasets on which they have been assessed. In addition, we present the common evaluation matrix used to measure their accuracy. Moreover, we focus on some of the methods and look closely at their architectures in order to find out how they have achieved their reported performances. Finally, we conclude by discussing some of the open problems and their possible solutions.

Published
2019

28. The influence of veneer thickness and knot proportion on the mechanical properties of laminated veneer lumber (LVL) made from secondary quality hardwood

Author

Citra Yanto Ciki Purba, Joffrey Viguier, Louis Denaud, Julien Ruelle, Guillaume Pot, SILVA (SILVA), Institut National de la Recherche Agronomique (INRA)-Université de Lorraine (UL)-AgroParisTech, Laboratoire Bourguignon des Matériaux et Procédés (LABOMAP), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM), GDR 3544 Science du Bois, Indonesia Endowment Fund for Education, Bourgogne Franche Comte Region, [ANR-10-EQPX-16 XYLOFOREST], Laboratoire Bourguignon des Matériaux et Procédés (LaBoMaP), École Nationale Supérieure d'Arts et Métiers (ENSAM), and HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies

Subjects
040101 forestry, 0106 biological sciences, Materials science, Mécanique [Sciences de l'ingénieur], medicine.medical_treatment, Static modulus of elasticity, Forestry, Knot (papermaking), Laminated veneer lumber, 04 agricultural and veterinary sciences, [SPI.MECA]Engineering Sciences [physics]/Mechanics [physics.med-ph], 01 natural sciences, Shear modulus, Flexural strength, 010608 biotechnology, medicine, Hardwood, 0401 agriculture, forestry, and fisheries, General Materials Science, Veneer, Composite material, Elasticity (economics)
Abstract

International audience; The first objective of this work was to study the influence of veneer quality on the mechanical properties of laminated veneer lumber (LVL) made of secondary quality hardwood. The second objective was to propose an adapted veneer thickness that provides the optimum mechanical properties of LVL, taking the veneer properties into account. Forty-eight LVL panels glued together using polyvinyl acetate (PVAc) were prepared. The quality of fresh veneers was assessed by measuring veneer knot proportion, lathe check depth and lathe check interval. The static modulus of elasticity (MOE), dynamic MOE, modulus of rupture (MOR) and shear modulus were measured using destructive and non-destructive methods. The 3 mm thick veneer provided the optimum mechanical properties for LVL for both species. The test direction did not have any significant influence on the mechanical properties. In the flatwise direction, the average MOE values obtained were 13.2 GPa for beech LVL and 13.3 GPa for oak LVL, whereas the MOR was 72.0 MPa and 63.4 MPa, respectively. Increasing knot proportion in veneers results in a decrease in LVL MOE and MOR. Moreover, deeper lathe checks and higher lathe check intervals on veneer surfaces provide lower LVL shear modulus in the edgewise direction for both species. Internal veneer provides LVL with a higher density but weaker mechanical properties due to a higher knot proportion in the internal veneer.

Published
2019

29. Heart rate estimation using remote photoplethysmography with multi-objective optimization

Author

Yannick Benezeth, Richard Macwan, Alamin Mansouri, Laboratoire d'Electronique, d'Informatique et d'Image [EA 7508] (Le2i), Université de Technologie de Belfort-Montbeliard (UTBM)-Université de Bourgogne (UB)-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, and HESAM Université (HESAM)-HESAM Université (HESAM)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement-Centre National de la Recherche Scientifique (CNRS)

Subjects
Measure (data warehouse), Pixel, business.industry, Computer science, 0206 medical engineering, Autocorrelation, [INFO.INFO-CV]Computer Science [cs]/Computer Vision and Pattern Recognition [cs.CV], Health Informatics, Pattern recognition, 02 engineering and technology, 020601 biomedical engineering, Signal, Independent component analysis, Multi-objective optimization, 03 medical and health sciences, 0302 clinical medicine, [INFO.INFO-TS]Computer Science [cs]/Signal and Image Processing, Photoplethysmogram, Signal Processing, RGB color model, Artificial intelligence, business, ComputingMilieux_MISCELLANEOUS, 030217 neurology & neurosurgery
Abstract

Remote photoplethysmography (rPPG) is being increasingly used to measure heart rate from recorded or live videos. The rhythmic flow of arterial blood, referred to as the blood volume pulse, results in periodic variations in the skin color which are then quantified into a temporal signal for analysis. Independent Component Analysis (ICA) has been used to extract the blood volume pulse which is assumed to have been mixed into the RGB channels of the skin pixels. We propose a novel semi-blind source extraction method for measuring rPPG using a multi-objective optimization approach with autocorrelation as a periodicity measure. Our method was tested on our inhouse video database UBFC-RPPG and the MMSE-HR database [33] . Our in-house database is made publicly available and is specifically aimed towards testing rPPG measurements. Our method showed improved performance over other state of the art rPPG algorithms in terms of accuracy with all the databases.

Published
2019

30. Coupling Pulsed Flying Spot technique with robot automation for industrial thermal characterization of complex shape composite materials

Author

Agustín Salazar, V. Delos, Christophe Pradere, Alain Sommier, J. Malvaut, T. Bazire, M. Romano, Jean-Christophe Batsale, Alberto Oleaga, Arantza Mendioroz, Institut de Mécanique et d'Ingénierie de Bordeaux (I2M), Institut National de la Recherche Agronomique (INRA)-Université de Bordeaux (UB)-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS), and SERIDA, Centro de Biotecnología Animal

Subjects
010302 applied physics, Materials science, Laser scanning, business.industry, Mechanical Engineering, Isotropy, Field of view, Condensed Matter Physics, Laser, Thermal diffusivity, computer.software_genre, 01 natural sciences, law.invention, [SPI]Engineering Sciences [physics], Optics, law, 0103 physical sciences, Computer Aided Design, General Materials Science, business, 010301 acoustics, Robotic arm, Image resolution, computer, ComputingMilieux_MISCELLANEOUS
Abstract

In a previous work we developed methods based on Pulsed Flying Spot (PFS) to measure the in-plane thermal diffusivity of (an)isotropic materials. Due to the optical laser scanning system, the effective measurement area is around 5 cm × 5 cm) to obtain a good spatial resolution and to ensure accurate estimated thermal fields. First, to extend the previous method to largest scanning area, we propose to use a robotic arm to analyse large composite samples of complex shape (more than 50 cm × 50 cm). The main advantage of using the robot is to design by Computer Aided Design the complete geometry of the composite sample in order to scan the complete area of the composite and also to orient the non-plane surface of the sample perpendicular to the IR camera field of view and laser spot. Finally, all the area can be thermally characterized and the retrieved in plane thermal diffusivities maps are pasted on the 3D shape to visualise heterogeneity and anisotropy.

Published
2019

31. Novel Approach to Estimate Osteoarthritis Progression: Use of the Reliable Change Index in the Evaluation of Joint Space Loss

Author

Parsons, Camille M., Judge, Andrew, Leyland, Kirsten, Bruyere, Olivier, Dop, Florence Petit, Chapurlat, Roland, Reginster, Jean-yves, Edwards, Mark H., Dennison, Elaine M., Cooper, Cyrus, Inskip, Hazel, Reginster, J. -y., Christiansen, C., Delmas, P., Genant, H., Zacher, J., Bellamy, N., Speirs, C., Breart, G., Meyer, O., Gensburger, D., Arlot, M., Roux, J. -P., Deroisy, R., Sambrook, P., Leeb, B., Verbruggen, A., Bensen, W. G., Hala, T., Holm−bentzen, M., Valter, I., Chevalier, X., Swoboda, B., Adami, S., Kloppenburg, M., Grazuleviciute, E., Badurski, J., Branco, J., Nasonov, E., Navarro, F., Spector, T., Barnsley, L., Hall, S., Jones, G., Klestov, A., March, L., Nash, P., Romas, E., Will, R., Erlacher, L., Leeb, F. B., Resch, H., Rainer, F., Zamani, O., Appelboom, T., Devogelaer, J. P., Kvasz, A., Raeman, F., Beaulieu, A. D., Brown, J., Cividino, A. A., Morin, F., Olszynski, W. P., Raynauld, J. P., Thorne, J. C., Pavelka, K., Alexandersen, P., Hoeck, H. C., Holm-Bentzen, M., Lundqvist, P., Aim, L., Audouy, P., Beaunier, P., Benhamou, C. L., Berenbaum, F., Chabaud, E., Cohen-Solal, M., Delbecq, D., Euller-Ziegler, L., Fardellone, Patrice, Hilliquin, P., Jacquety, E., Jude, N., Lechevalier, D., Mouchet, J. C., Richette, P., Sainte Lorette, E., Schaeverbeke, T., Sebbah, A., Vignot, E., Brabant, T., Burm-Ester, G. R., Grifka, J., Mueller, P. E. M., Bianchi, G., Grassi, W., Di Matteo, L., Modena, V., Di Munno, O., Orto-Lani, S., Punzi, L., Zangari, M., Roorda, L. D., van Riel, P. L. C. M., Czerwinski, E., Gorecki, A., Tlustochowicz, W., da Silva, J. Canas, Gomes, J. A. Melo, Miranda, L. M., Radulescu, F., Alexeeva, L. I., Orlov-Morozov, A. V., Pikhlak, E. G., Pilyaev, V. G., Shostak, N. A., Shmidt, E. I., Zagorodniy, N. V., Rodriguez, L. Arboleya, Ruiz, P. Benito, Carmona, E. Chamizo, Estevez, E. Collantes, Herrero-Beaumont, G., Mola, E. Martin, Moreno, A., Hernandez, A. Naranjo, Sarabia, F. Navarro, Padrino, J. M., Palacios, C., Serna, A. Rodriguez, Ivorra, J. A. Roman, Torrijos, A., Abdulhakim, E., Arden, N., Birrell, F., Donnachie, H., Fraser, W., Keen, R., Sarmiento, R., Stone, M. D., Grp, Sekoia Study, Department of public health, Université de Liège, Service de Rhumatologie et Pathologie Osseuse [Lyon], Hôpital Edouard Herriot [CHU - HCL], Hospices Civils de Lyon (HCL)-Hospices Civils de Lyon (HCL), Physiopathologie, diagnostic et traitements des maladies osseuses / Pathophysiology, Diagnosis & Treatments of Bone Diseases (LYOS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de la Santé et de la Recherche Médicale (INSERM), World Health Organization (WHO), World Health Organization, University of Southampton, University of Bristol [Bristol], Bradford Institute for Health Research, Bradford Teaching Hospitals NHS Foundation Trust, Bradford, UK (BIHR), Department of Public Health, Epidemiology and Health Economics, Center for Permafrost (CENPERM), Department of Geosciences and Natural Resource Management [Copenhagen] (IGN), Faculty of Science [Copenhagen], University of Copenhagen = Københavns Universitet (UCPH)-University of Copenhagen = Københavns Universitet (UCPH)-Faculty of Science [Copenhagen], University of Copenhagen = Københavns Universitet (UCPH)-University of Copenhagen = Københavns Universitet (UCPH), Queen's University [Kingston, Canada], Department of Computer Science [Auckland], University of Auckland [Auckland], Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), University of Antwerp (UA), Arkema (Arkema), Hutchinson SA, Chair of Aerodynamics and Fluid Mechanics, Technische Universität Munchen - Université Technique de Munich [Munich, Allemagne] (TUM), Leiden University Medical Center (LUMC), Universiteit Leiden, CEDOC - Department of Rheumatology, Centro de Estudos de Doenças Crónicas (CEDOC), NOVA Medical School - Faculdade de Ciências Médicas (NMS), Universidade Nova de Lisboa = NOVA University Lisbon (NOVA)-Universidade Nova de Lisboa = NOVA University Lisbon (NOVA)-NOVA Medical School - Faculdade de Ciências Médicas (NMS), Universidade Nova de Lisboa = NOVA University Lisbon (NOVA)-Universidade Nova de Lisboa = NOVA University Lisbon (NOVA), CHLO/Hospital Egas Moniz, Commissariat à l'énergie atomique et aux énergies alternatives - Laboratoire d'Electronique et de Technologie de l'Information (CEA-LETI), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Radio and Space Plasma Physics Group [Leicester] (RSPP), University of Leicester, School of Environmental Sciences, University of Greenwich, Johns Hopkins University (JHU), University of Queensland [Brisbane], Université Laval [Québec] (ULaval), Intergroupe Francophone de Cancérologie Thoracique [Paris] (IFCT), Intergroupe Francophone de Cancérologie thoracique, Institute of Rheumatology, University Prague, Oskar Klein Centre [Stockholm], Stockholm University, Laboratoire de Réactivité de Surface (LRS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Centre de Recherche Saint-Antoine (CRSA), Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Sorbonne Université (SU), Biologie de l'Os et du Cartilage : Régulations et Ciblages Thérapeutiques (BIOSCAR (UMR_S_1132 / U1132)), Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Paris Cité (UPCité), Service de rhumatologie, Centre Hospitalier Universitaire de Nice (CHU Nice)-Hôpital l'Archet, Département de Rhumatologie, CHU Amiens-Picardie, Mécanismes physiopathologiques et conséquences des calcifications vasculaires - UR UPJV 7517 (MP3CV), Université de Picardie Jules Verne (UPJV)-CHU Amiens-Picardie, Centre Hospitalier Sud Francilien, Laboratoire d'Electronique, d'Informatique et d'Image [EA 7508] (Le2i), Université de Technologie de Belfort-Montbeliard (UTBM)-Université de Bourgogne (UB)-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-Centre National de la Recherche Scientifique (CNRS), Hôpital Lariboisière-Fernand-Widal [APHP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP), Aquitaine’s Care and Research organisation for inflammatory and Immune-Mediated diseases [CHU Bordeaux] (FHU ACRONIM), CHU Bordeaux [Bordeaux], Centre de recherche Cardio-Thoracique de Bordeaux [Bordeaux] (CRCTB), Université Bordeaux Segalen - Bordeaux 2-CHU Bordeaux [Bordeaux]-Institut National de la Santé et de la Recherche Médicale (INSERM), Hospices Civils de Lyon (HCL), Department of Bone and Joint Diseases, Faculty of Medicine and Health Sciences, Uniwersytet Jagielloński w Krakowie = Jagiellonian University (UJ), Consejo Superior de Investigaciones Científicas [Madrid] (CSIC), Departamento de Construcción y Agronomía, Facultad de Ciencias Agrarias y Ambientales, University of Oxford, The University of Sydney, IUMEA, University of Las Palmas de Gran Canaria (ULPGC), the SEKOIA management team, Bradford Teaching Hospitals NHS Foundation Trust [Bradford, Royaume-Uni], University of Copenhagen = Københavns Universitet (KU)-University of Copenhagen = Københavns Universitet (KU)-Faculty of Science [Copenhagen], University of Copenhagen = Københavns Universitet (KU)-University of Copenhagen = Københavns Universitet (KU), Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Paris Cité (UPC), HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Centre National de la Recherche Scientifique (CNRS), University of Oxford [Oxford], APH - Aging & Later Life, and Rehabilitation medicine

Subjects
Male, medicine.medical_specialty, Knee Joint, [SDV]Life Sciences [q-bio], Radiography, Osteoarthritis, Thiophenes, Placebo, Severity of Illness Index, Article, law.invention, Healthcare improvement science Radboud Institute for Health Sciences [Radboudumc 18], Rheumatology, Randomized controlled trial, Strontium ranelate, law, Internal medicine, Severity of illness, Medicine, Humans, skin and connective tissue diseases, Aged, Bone Density Conservation Agents, business.industry, Reproducibility of Results, Middle Aged, Osteoarthritis, Knee, medicine.disease, Multicenter study, Physical therapy, Disease Progression, Female, sense organs, business, medicine.drug
Abstract

Contains fulltext : 202254.pdf (Publisher’s version ) (Closed access) OBJECTIVE: Osteoarthritis-related changes in joint space measurements over time are small and sensitive to measurement error. The Reliable Change Index (RCI) determines whether the magnitude of change observed in an individual can be attributed to true change. This study aimed to examine the RCI as a novel approach to estimating osteoarthritis progression. METHODS: Data were from 167 men and 392 women with knee osteoarthritis (diagnosed using the American College of Rheumatology criteria) randomized to the placebo arm of the 3-year Strontium Ranelate Efficacy in Knee Osteoarthritis trial (SEKOIA) and assessed annually. The RCI was used to determine whether the magnitude of change in joint space width (JSW) on radiographs between study years was likely to be true or due to measurement error. RESULTS: Between consecutive years, 57-69% of participants had an apparent decrease (change

Published
2019

32. Flat acoustics with soft gradient-index metasurfaces

Author

Olivier Poncelet, Raj Kumar, Thomas Brunet, Yabin Jin, Olivier Mondain-Monval, Institut de Mécanique et d'Ingénierie de Bordeaux (I2M), Institut National de la Recherche Agronomique (INRA)-Université de Bordeaux (UB)-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS), Centre de Recherche Paul Pascal (CRPP), Université de Bordeaux (UB)-Centre National de la Recherche Scientifique (CNRS), ANR: ANR-10-LABEX-0042-AMADEUS,Labex AMADEUS, ANR-10-IDEX-0003-02/10-IDEX-0003,IDEX BORDEAUX,IdEx Bordeaux(2010), ANR-15-CE08-0024,BRENNUS,Revêtements fonctionnels acoustiques à base de Métamatériaux souples(2015), Université de Bordeaux (UB)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), ANR-10-LABX-0042,AMADEus,Advanced Materials by Design(2010), and ANR-10-IDEX-0003,IDEX BORDEAUX,Initiative d'excellence de l'Université de Bordeaux(2010)

Subjects
0301 basic medicine, Fabrication, Materials science, Acoustics and Ultrasonics, Acoustics, Science, Beam steering, General Physics and Astronomy, Physics::Optics, 02 engineering and technology, 01 natural sciences, Article, General Biochemistry, Genetics and Molecular Biology, 03 medical and health sciences, Matrix (mathematics), Planar, 0302 clinical medicine, Arts and Humanities (miscellaneous), Speed of sound, Broadband, 0103 physical sciences, Soft matter, lcsh:Science, 030223 otorhinolaryngology, Porosity, 010301 acoustics, Wavefront, chemistry.chemical_classification, Multidisciplinary, Metamaterial, General Chemistry, Polymer, Acoustic wave, 021001 nanoscience & nanotechnology, metasurfaces, Characterization (materials science), 030104 developmental biology, [CHIM.POLY]Chemical Sciences/Polymers, chemistry, Flat acoustics, Ultrasonic sensor, lcsh:Q, Development (differential geometry), 0210 nano-technology, Beam (structure)
Abstract

Recently, metasurfaces have been proven to be effective and compact devices for the design of arbitrary wavefronts. Metasurfaces are planar metamaterials with a subwavelength thickness that allows wavefront shaping by introducing in-plane variations, namely, gradients, in the spatial wave response of these flat structures. Here we report a new class of acoustic gradient-index (GRIN) metasurfaces engineered from soft graded-porous silicone rubber with a high acoustic index for broadband ultrasonic three-dimensional wavefront shaping in water. The functionalities of these soft flat lenses are illustrated through various experiments, which demonstrate beam steering and beam focusing, as well as vortex beam generation in free space. These new GRIN metasurfaces may have important applications in various domains using designed ultrasonic fields (biomedical imaging, industrial non-destructive testing, contactless particle manipulation), since their fabrication is very straightforward with common polymer science engineering., Here, the authors report an approach for creating various acoustic wavefronts in free space by using soft gradient-index porous metasurfaces. These flat lenses generate steered planar, focused spherical and helical ultrasonic beams in water by manipulating the spatial distribution of the material porosity.

Published
2019

33. Establishing Accuracy of Watershed-Derived Pore Network Extraction for Characterizing In-Plane Effective Diffusivity in Thin Porous Layers

Author

Aimy Bazylak, James Hinebaugh, Stéphane Chevalier, Institut de Mécanique et d'Ingénierie de Bordeaux (I2M), Institut National de la Recherche Agronomique (INRA)-Université de Bordeaux (UB)-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS), and University of Toronto

Subjects
Work (thermodynamics), Materials science, 020209 energy, 02 engineering and technology, Sciences de l'ingénieur, Thermal diffusivity, Coatings and Films, [SPI]Engineering Sciences [physics], Electronic, 0202 electrical engineering, electronic engineering, information engineering, Materials Chemistry, Electrochemistry, Gaseous diffusion, Extraction (military), Optical and Magnetic Materials, Porosity, Microscale chemistry, Network model, Sustainability and the Environment, Renewable Energy, Sustainability and the Environment, Condensed Matter Physics, Compression (physics), Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Surfaces, Biological system
Abstract

International audience; The work presented in this paper reports a versatile and customizable watershed-based pore network extraction tool. It was used to build pore networks from microscale computed tomography images of highly porous carbon-fiber materials. The extracted networks were used to characterize the structural properties (pore and throat diameter, and porosity distributions) and to predict the dry, in-plane, effective diffusivities of two commercial gas diffusion layers under various levels of compression. The relationship between compression and effective diffusivity was used to accurately predict experimental values available in the literature to within 10% of the reported values for compressive strains less than 0.55. Through this work, we validate the accuracy of watershed-derived pore networks for predicting in-plane effective diffusivities, further establishing the reliability of watershed-derived pore network modeling for fuel cell applications.

Published
2019

34. On the analytical expression of the multicompacton and some exact compact solutions of a nonlinear diffusive Burgers’type equation

Author

Patrick Marquié, Timoleon Crepin Kofane, Désiré Ndjanfang, David Yemélé, Laboratoire de Mécanique, Université de Yaoundé I, Laboratoire de Mécanique et de Modélisation des Systèmes Physiques (L2MSP), Université de Dschang, Laboratoire Electronique, Informatique et Image [UMR6306] (Le2i), Université de Bourgogne (UB)-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Electronique, d'Informatique et d'Image [EA 7508] (Le2i), and Université de Technologie de Belfort-Montbeliard (UTBM)-Université de Bourgogne (UB)-École Nationale Supérieure d'Arts et Métiers (ENSAM)

Subjects
[PHYS.PHYS.PHYS-FLU-DYN]Physics [physics]/Physics [physics]/Fluid Dynamics [physics.flu-dyn], Differential equation, Differential-Equations, [PHYS.MPHY]Physics [physics]/Mathematical Physics [math-ph], Solitons, 01 natural sciences, 010305 fluids & plasmas, Kink with compact support, [PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], Modified double Exp-function method, 0103 physical sciences, [MATH]Mathematics [math], Nonlinear Sciences::Pattern Formation and Solitons, 010301 acoustics, N) Equations, Physics, Extend sine-cosine method, Numerical Analysis, Applied Mathematics, Mathematical analysis, [PHYS.MECA]Physics [physics]/Mechanics [physics], Wave Solutions, Nonlinear diffusive Burgers' equation, Expression (mathematics), Pulse (physics), Nonlinear system, Multicompacton, Evolution-Equations, Exact solutions in general relativity, Compactons, Pulse-amplitude modulation, Modeling and Simulation, Line (geometry), Trigonometry, Pulse with compact support
Abstract

International audience; We consider the nonlinear diffusive Burgers' equation as a model equation for signals propagation on the nonlinear electrical transmission line with intersite nonlinearities. By applying the extend sine-cosine method and using an appropriate modification of the Double-Exp function method, we successfully derived on one hand the exact analytical solutions of two types of solitary waves with strictly finite extension or compact support: kinks and pulses, and on the other hand the exact solution for two interacting pulse solitary waves with compact support. These analytical results indicate that the speed of the pulse compactons doesn't depends explicitly on the pulse amplitude as has been expected for long, but rather on the dc-component associated to this trigonometric solution. More interesting, the interactions between the two pulse compactons induce only a phase shift even though they are close together. These analytical solutions are checked by means of numerical simulations. (c) 2018 Elsevier B.V. All rights reserved.

Published
2018

35. Energy Extraction Performance Improvement of a Flapping Foil by the Use of Combined Foil

Author

Annie-Claude Bayeul-Laine, O. Coutier Delgosha, A. Benzaoui, A. Boudis, Ouahiba Guerri, Hamid Oualli, Université des Sciences et de la Technologie Houari Boumediene [Alger] (USTHB), Ecole Militaire Polytechnique [Alger] (EMP), Ministère de l'Enseignement Supérieur et de la Recherche Scientifique [Algérie] (MESRS)-Ministère de la Défense Nationale [Algérie], Centre de Développement des Energies Renouvelables (CDER), Ministère de l'Enseignement Supérieur et de la Recherche Scientifique [Algérie] (MESRS), Laboratoire de Mécanique des Fluides de Lille – Kampé de Fériet - UMR 9014 (LMFL), Centrale Lille-ONERA-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM), Virginia Tech [Blacksburg], Université des Sciences et de la Technologie Houari Boumediene = University of Sciences and Technology Houari Boumediene [Alger] (USTHB), HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM), Laboratoire de Mécanique des Fluides de Lille – Kampé de Fériet (LMFL), Ecole Centrale de Lille-ONERA-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, and HESAM Université (HESAM)-HESAM Université (HESAM)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)

Subjects
Flapping foil, Materials science, lcsh:Mechanical engineering and machinery, 020209 energy, Mechanical engineering, 02 engineering and technology, Computational fluid dynamics, Sciences de l'ingénieur, Power coefficient, [SPI]Engineering Sciences [physics], Combined foil, 0202 electrical engineering, electronic engineering, information engineering, lcsh:TJ1-1570, FOIL method, business.industry, Mechanical Engineering, Extraction (chemistry), Condensed Matter Physics, Mechanics of Materials, Energy extraction, CFD, Performance improvement, business, Energy (signal processing)
Abstract

International audience; In this study, numerical investigations on the energy extraction performance of a flapping foil device are carried out by using a modified foil shape. The new foil shape is designed by combining the thick leading edge of NACA0012 foil and the thin trailing edge of NACA0006 foil. The numerical simulations are based on the solution of the unsteady and incompressible Navier-Stokes equations that govern the fluid flow around the flapping foil. These equations are resolved in a two-dimensional domain with a dynamic mesh technique using the CFD software ANSYS Fluent 16. A User Define Function (UDF) controls the imposed sinusoidal heaving and pitching motions. First, for a validation study, numerical simulations are performed for a NACA0012 foil undergoing imposed heaving and pitching motions at a low Reynolds number. The obtained results are in good agreement with numerical and experimental data available in the literature. Thereafter, the computations are applied for the new foil shape. The influences of the connecting area location between the leading and trailing segments, the Strouhal number and the effective angle of attack on the energy extraction performance are investigated at low Reynolds number (Re = 10 000). Then, the new foil shape performance was compared to those of both NACA0006 and NACA0012 baseline foils. The results have shown that the proposed foil shape achieves higher performance compared to the baseline NACA foils. Moreover, the energy extraction efficiency was improved by 30.60% compared to NACA0006 and by 17.32% compared to NACA0012. The analysis of the flow field around the flapping foils indicates a change of the vortex structure and the pressure distribution near the trailing edge of the combined foil compared to the baseline foils.

Published
2018

36. DOMEGO: A Board Game for Learning How to Manage a Construction Project

Author

Franck Taillandier, Myriam Chaplain, Alice Micolier, Gérard Sauce, Risques, Ecosystèmes, Vulnérabilité, Environnement, Résilience (RECOVER), Aix Marseille Université (AMU)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Institut de Mécanique et d'Ingénierie (I2M), Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Arts et Métiers Sciences et Technologies, HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM), Laboratoire Optimisation de la Conception et Ingénierie de l'Environnement (LOCIE), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Institut de Mécanique et d'Ingénierie de Bordeaux (I2M), Institut National de la Recherche Agronomique (INRA)-Université de Bordeaux (UB)-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, and HESAM Université (HESAM)-HESAM Université (HESAM)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS)

Subjects
Construction management, Engineering, Experimental learning, Civil Engineering Teaching, 0211 other engineering and technologies, Ready-to-Use Game, 02 engineering and technology, Experiential learning, Board Game, Education, [SPI]Engineering Sciences [physics], 021105 building & construction, Developmental and Educational Psychology, ComputingMilieux_COMPUTERSANDEDUCATION, Protocol (object-oriented programming), Risk management, Risk Management, business.industry, 4. Education, 05 social sciences, Stakeholder, 050301 education, Engineering management, Innovative Teaching, Engineering education, Construction Organization, Active learning, Engineering Student, business, 0503 education, Educational program
Abstract

International audience; Construction project is a major learning of the civil engineering educational program. However, the related knowledge is difficult to apprehend and assimilate during lectures since it is theoretical and practical work or tutorials on the subject are scarce. To address this issue, the authors developed DOMEGO, a game for teaching construction projects to civil engineering students. This board game aims to provide students with active and experiential learning of the key issues of a construction project. In the game, each player embodies a stakeholder of a construction project and must carry out the project while meeting her/his objectives. DOMEGO has been successfully integrated into an instructional setting of undergraduate students in Civil Engineering at the University of Bordeaux and Polytech, Nice Engineering School. Student feedback collected in the post-game survey was very positive. However, a more thorough analysis with a real evaluation protocol would be necessary to validate the game interest to teach construction project.

Published
2021

37. Influence of machine parameters on Ti-6Al-4V small sized specimens made by Laser Metal Powder Deposition

Author

Catherine Froustey, Charles Brugger, Ludovic Dufau, Julie Lartigau, Sarah Milhomme, ESTIA Recherche, Ecole Supérieure des Technologies Industrielles Avancées (ESTIA), École Nationale Supérieure d'Arts et Métiers (ENSAM) - Bordeaux, Institut de Mécanique et d'Ingénierie de Bordeaux (I2M), Institut National de la Recherche Agronomique (INRA)-Université de Bordeaux (UB)-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'Energie Atomique et aux Energies Alternatives (CEA-CESTA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), ESTIA INSTITUTE OF TECHNOLOGY, Institut de Mécanique et d'Ingénierie (I2M), Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Arts et Métiers Sciences et Technologies, and HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)

Subjects
010302 applied physics, Materials science, Metallurgy, General Engineering, 02 engineering and technology, [SPI.MECA.MSMECA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Materials and structures in mechanics [physics.class-ph], 021001 nanoscience & nanotechnology, Laser, 01 natural sciences, law.invention, law, 0103 physical sciences, Metal powder, Ti 6al 4v, 0210 nano-technology, Deposition (chemistry), ComputingMilieux_MISCELLANEOUS
Abstract

The present work is focused on one Additive Manufacturing (AM) process – Laser powder Metal Deposition (LMD-p) – and on one metallic alloy – Ti-6Al-4V. State of the art on LMD-p on Ti-6Al-4V alloy shows that three kinds of process parameters influence mechanical properties of building parts: raw materials (powder and substrate), machine parameters (Laser Power (P), Powder Flow (F) and Building Speed (V)), and building strategies (part orientation, waiting time between layers, etc.). Thus, this paper relates to first manufacturing investigations on small sized specimens (bead, wall and block) with the aim of providing a better knowledge about the first steps of manufacturing. Particularly, this paper is dedicated to the study of machine parameters (P, F and V). First, the influence of each machine parameter on 28 beads is studied separately. The geometrical aspect (high, width, dilution) of each bead is microscopically measured. Similarly, combinations of parameters (P/F, Energy Density and Powder Density) are introduced to increase parameters degree of freedom. First results show that P, V and F have a major influence on the beads’ geometry. In addition, a window process map is plotted and allows determining functional areas of machine parameters. From this map, walls (vertical superposition of one bead) are manufactured and microscopically observed. Functional sets of parameters from walls are selected and blocks can be built.

Published
2021

38. Influence of machine parameters on Ti-6Al-4V small sized specimens made by Laser Metal Deposition

Author

LARTIGAU, Julie, MILHOMME, Sarah, BRUGGER, Charles, FROUSTEY, Catherine, DUFAU, Ludovic, Ecole Supérieure des Technologies Industrielles Avancées (ESTIA), ESTIA Recherche, École Nationale Supérieure d'Arts et Métiers (ENSAM) - Bordeaux, Institut de Mécanique et d'Ingénierie de Bordeaux (I2M), École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS)-Université de Bordeaux (UB)-Institut National de la Recherche Agronomique (INRA), Commissariat à l'Energie Atomique et aux Energies Alternatives (CEA-CESTA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), ESTIA INSTITUTE OF TECHNOLOGY, Institut National de la Recherche Agronomique (INRA)-Université de Bordeaux (UB)-École Nationale Supérieure d'Arts et Métiers (ENSAM), HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS), and HESAM Université (HESAM)-HESAM Université (HESAM)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS)

Subjects
Parametrical study, Process parameters, Additive manufacturing, Laser metal powder deposition, Ti-6Al-4V, [SPI.MECA.MSMECA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Materials and structures in mechanics [physics.class-ph], [PHYS.MECA.MSMECA]Physics [physics]/Mechanics [physics]/Materials and structures in mechanics [physics.class-ph], ComputingMilieux_MISCELLANEOUS
Abstract

International audience; The present work is focused on one Additive Manufacturing (AM) process – Laser powder Metal Deposition (LMD-p) – and on one metallic alloy – Ti-6Al-4V. State of the art on LMD-p on Ti-6Al-4V alloy shows that three kinds of process parameters influence mechanical properties of building parts: raw materials (powder and substrate), machine parameters (Laser Power (P), Powder Flow (F) and Building Speed (V)), and building strategies (part orientation, waiting time between layers, etc.). Thus, this paper relates to first manufacturing investigations on small sized specimens (bead, wall and block) with the aim of providing a better knowledge about the first steps of manufacturing. Particularly, this paper is dedicated to the study of machine parameters (P, F and V).First, the influence of each machine parameter on 28 beads is studied separately. The geometrical aspect (high, width, dilution) of each bead is microscopically measured. Similarly, combinations of parameters (P/F, Energy Density and Powder Density) are introduced to increase parameters degree of freedom. First results show that P, V and F have a major influence on the beads’ geometry. In addition, a window process map is plotted and allows determining functional areas of machine parameters. From this map, walls (vertical superposition of one bead) are manufactured and microscopically observed. Functional sets of parameters from walls are selected and blocks can be built.

Published
2021

39. Pore network model of drying with Kelvin effect

Author

Otman Maalal, Marc Prat, Didier Lasseux, Bordeaux INP - BINP (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), Arts et Métiers Sciences et Technologies - ENSAM (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Institut de la Filtration et des Techniques Séparatives - IFTS (FRANCE), Université de Bordeaux (FRANCE), Institut de Mécanique et d'Ingénierie de Bordeaux - I2M (Bordeaux, France), Institut de Mécanique et d'Ingénierie de Bordeaux (I2M), Institut National de la Recherche Agronomique (INRA)-Université de Bordeaux (UB)-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, and HESAM Université (HESAM)-HESAM Université (HESAM)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS)

Subjects
Capillary action, Mécanique des fluides, Computational Mechanics, Curvature, 01 natural sciences, Isothermal process, [SPI.MAT]Engineering Sciences [physics]/Materials, 010305 fluids & plasmas, Physics::Fluid Dynamics, [SPI]Engineering Sciences [physics], symbols.namesake, [CHIM.GENI]Chemical Sciences/Chemical engineering, 0103 physical sciences, [SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering, Diffusion (business), 010306 general physics, Physics::Atmospheric and Oceanic Physics, Drying, Fluid Flow and Transfer Processes, Physics, Mean curvature, [SPI.FLUID]Engineering Sciences [physics]/Reactive fluid environment, Mechanical Engineering, Pore network model, Mechanics, [SPI.MECA]Engineering Sciences [physics]/Mechanics [physics.med-ph], Condensed Matter Physics, Kelvin equation, Kelvin effect, [SDU]Sciences of the Universe [physics], Mechanics of Materials, [SDE]Environmental Sciences, symbols, Knudsen number, Porous medium
Abstract

International audience; A pore network model of isothermal drying is presented. The model takes into account the capillary effects, the transport of vapor by diffusion, including Knudsen effect, in the gas phase, and the Kelvin effect. The model is seen as a first step toward the simulation of drying in mesoscopic porous materials involving pore sizes between 4 nm and 50 nm. The major issue addressed with the present model is the computation of the menisci mean curvature radius at the boundary of each liquid cluster in conjunction with the Kelvin effect. The impact of Kelvin effect on the drying process is investigated, varying the relative humidity in the ambient air outside the medium. The simulations indicate that the Kelvin effect has a significant impact on the liquid distribution during drying. The evaporation rate is found to fluctuate due to the menisci curvature variations during drying. The simulations also highlight a noticeable non-local equilibrium effect.

Published
2021

40. Determination of the throat size distribution of a porous medium as an inverse optimization problem combining pore network modeling and genetic and hill climbing algorithms

Author

Didier Lasseux, Marc Prat, Otman Maalal, René Peinador, Institut de Mécanique et d'Ingénierie de Bordeaux (I2M), Institut National de la Recherche Agronomique (INRA)-Université de Bordeaux (UB)-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique - CNRS (FRANCE), Arts et Métiers Sciences et Technologies - ENSAM (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Institut Polytechnique de Bordeaux - IPB (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Institut de la Filtration et des Techniques Séparatives - IFTS (FRANCE), Université de Bordeaux (FRANCE), and Institut de Mécanique et d'Ingénierie - I2M (Bordeaux, France)

Subjects
[SDE.IE]Environmental Sciences/Environmental Engineering, Mécanique des fluides, Pore network simulations, [SPI.FLUID]Engineering Sciences [physics]/Reactive fluid environment, Porous media, [SDU.STU]Sciences of the Universe [physics]/Earth Sciences, Mechanics, [SPI.MECA]Engineering Sciences [physics]/Mechanics [physics.med-ph], 01 natural sciences, 010305 fluids & plasmas, Distribution (mathematics), [CHIM.GENI]Chemical Sciences/Chemical engineering, Bundle, 0103 physical sciences, Genetic algorithm, Fluid dynamics, A priori and a posteriori, [SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering, 010306 general physics, Porous medium, Hill climbing, Network model, Mathematics
Abstract

International audience; The pore size distribution of a porous medium is often estimated from the retention curve or the invading fluid flow rate curve using simple relationships more or less explicitly based on the consideration that the porous medium is made of a bundle of cylindrical parallel tubes. This type of determination is tested using pore network simulations. Starting from two-or three-dimensional networks, the characteristics of which are known apriori, the estimation of the throat size distribution (TSD) is performed using the standard methods in the case of drainage. Results show a significant discrepancy with the input data. The disagreement is more pronounced when the fluid flow rate curve is employed together with the parallel tubes assumption. The physical origins of these shortcomings are identified. A method, based on pore network simulations combined with a genetic algorithm and the hill climbing algorithm, is then designed, which makes simultaneous use of the nonwetting fluid flow rate curve and the retention curve of the medium. Very significant improvement is achieved in the estimation of the TSD using this procedure.

Published
2021

41. A novel one-domain approach for modeling flow in a fluid-porous system including inertia and slip effects

Author

Francisco J. Valdés-Parada, Didier Lasseux, Institut de Mécanique et d'Ingénierie de Bordeaux (I2M), Institut National de la Recherche Agronomique (INRA)-Université de Bordeaux (UB)-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS), and ANR-11-RSNR-0012,MACENA,Maitrise du confinement d'une enceinte en accident(2011)

Subjects
Work (thermodynamics), media_common.quotation_subject, Computational Mechanics, Slip (materials science), Inertia, 01 natural sciences, Domain (mathematical analysis), 010305 fluids & plasmas, Physics::Fluid Dynamics, [SPI]Engineering Sciences [physics], [CHIM.GENI]Chemical Sciences/Chemical engineering, 0103 physical sciences, Upscaling, [SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering, Tensor, 010306 general physics, media_common, Fluid Flow and Transfer Processes, Physics, Mechanical Engineering, [SPI.FLUID]Engineering Sciences [physics]/Reactive fluid environment, Mechanics, Stokes flow, [SPI.MECA]Engineering Sciences [physics]/Mechanics [physics.med-ph], Condensed Matter Physics, Porous media flow, Porous media equation, One doamin approach, Flow (mathematics), 13. Climate action, Mechanics of Materials, [SDU]Sciences of the Universe [physics], [SDE]Environmental Sciences, Porous media flow and transport, Porous medium
Abstract

International audience; A new one-domain approach is developed in this work yielding an operational average description of one-phase flow in the classical Beavers and Joseph configuration including a porous medium topped by a fluid channel. The model is derived by considering three distinct regions: the homogeneous part of the porous domain, the inter-region, and the free fluid region. The development is carried out including inertial flow and slip effects at the solid-fluid interfaces. Applying an averaging procedure to the pore-scale equations, a unified macroscopic momentum equation, applicable everywhere in the system and having a Darcy form, is derived. The position-dependent apparent permeability tensor in this model is predicted from the solution of two coupled closure problems in the inter-region and in the homogeneous part of the porous medium. The performance of the model is assessed through in silico validations in different flow situations showing excellent agreement between the average flow fields obtained from direct numerical simulations of the pore-scale equations in the entire system and the prediction of the one-domain approach. Furthermore, validation with experimental data is also presented for creeping flow under no-slip conditions. In addition to the fact that the model is general from the point of view of the flow situations it encompasses, it is also simple and novel, hence providing a practical and interesting alternative to models proposed so far using one-or two-domain approaches.

Published
2021

42. Fluid-Structure Interactions in Discrete Mechanics

Author

Jean-Paul Caltagirone, Philippe Angot, Université de Bordeaux et Institut Polytechnique de Bordeaux (IPB), Institut de Mécanique et d'Ingénierie de Bordeaux (I2M), Institut National de la Recherche Agronomique (INRA)-Université de Bordeaux (UB)-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS), Institut de Mathématiques de Marseille (I2M), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), Aix-Marseille Université - Faculté des Sciences (AMU SCI), Aix Marseille Université (AMU), M. Deville et al., Institut de Mécanique et d'Ingénierie (I2M), Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Arts et Métiers Sciences et Technologies, and HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)

Subjects
Physics, Continuum mechanics, Galilean invariance, Fluid mechanics, Scalar potential, 16. Peace & justice, 01 natural sciences, Discrete Mechanics, [INFO.INFO-MO]Computer Science [cs]/Modeling and Simulation, 010305 fluids & plasmas, 010101 applied mathematics, Acceleration, Classical mechanics, [PHYS.MECA.STRU]Physics [physics]/Mechanics [physics]/Structural mechanics [physics.class-ph], 0103 physical sciences, Solid mechanics, Fluid-structure interaction, [PHYS.MECA.SOLID]Physics [physics]/Mechanics [physics]/Solid mechanics [physics.class-ph], [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph], 0101 mathematics, Displacement (fluid), [MATH.MATH-NA]Mathematics [math]/Numerical Analysis [math.NA], Vector potential
Abstract

International audience; The primary objective of discrete mechanics is to unify various laws from different areas of physics, such as fluid mechanics and solid mechanics. The same objective was also pursued by continuum mechanics, but the latter has not been entirely successful in accomplishing it. The Galilean invariance and the principle of equivalence make it possible to rewrite the law of dynamics as an equality between accelerations, the one undergone by the medium and the external accelerations applied to it. The derivation of the equation of discrete motion leads to writing the acceleration as a Hodge-Helmholtz decomposition, i.e. the sum of a gradient of a scalar potential and the rotational of a vector potential. By choosing the acceleration as being a primary variable, we can express the velocity and the displacement simply as quantities that accumulate over time. Potentials represent energies per unit mass and are also stored over time. The resulting formulation is able to describe the motion and dynamics of complex media, that can be both fluid and solid, under large deformations and large displacements. Two examples of fluid-structure coupling, an analytical solution and a numerical solution used for a benchmark, are presented here. They show the ability of the model to reproduce the behavior of interacting fluid and solid media.

Published
2021

43. Direct forcing immersed boundary method: Improvements to the Ghost Node Method

Author

JOST, Antoine Michael Diego, GLOCKNER, Stéphane, Institut de Mécanique et d'Ingénierie de Bordeaux (I2M), École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS)-Université de Bordeaux (UB)-Institut National de la Recherche Agronomique (INRA), Transferts, écoulements, fluides, énergétique (TREFLE), and Université Sciences et Technologies - Bordeaux 1-École Nationale Supérieure de Chimie et de Physique de Bordeaux (ENSCPB)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Immersed boundary method, [PHYS.PHYS.PHYS-FLU-DYN]Physics [physics]/Physics [physics]/Fluid Dynamics [physics.flu-dyn], [PHYS.PHYS.PHYS-COMP-PH]Physics [physics]/Physics [physics]/Computational Physics [physics.comp-ph], Discretization stencil, Direct forcing, Boundary conditions, [INFO.INFO-CE]Computer Science [cs]/Computational Engineering, Finance, and Science [cs.CE], Ghost-cell method, Poisson problem, [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph], [INFO.INFO-MO]Computer Science [cs]/Modeling and Simulation, Incompressible Navier-Stokes
Abstract

It has been previously shown that the ghost-cell immersed boundary methods (IBMs) with a maximum stencil size larger than 1 do not yield band matrices and as a result cannot use the more efficient geometric multi-grid algorithms and instead must rely on the more generic and less efficient algebraic multi-grid algorithms. To address these shortcomings and in the pursuit of smaller total run times, smaller memory requirements, and increased accuracy the current article proposes the linear square shifting and the quadratic ghost node methods for the ghost-cell IBM for Cartesian grids. The linear square shifting method guarantees a maximum stencil size of 1 for all immersed boundaries and the increases in accuracy and convergence of the proposed method are comprehensively verified with the canonical verification Poisson test problem. A comprehensive analysis of the effect of the quadratic ghost node method together with the shifting approach for various immersed boundary conditions is also performed with the Poisson test problem. The improved computational efficiency of these methods, and their various combinations, is also verified through the canonical validation test cases of laminar pipe flow and laminar flow past a sphere for various Reynolds numbers, wherein speed-ups of approximately three are achieved.

Published
2021

44. Eco-Driving with Electric Cars: Effect of Continuous and On-Demand Feedback on Driving Behavior and Safety

Author

BELOUFA , Sabrina, VAILLEAU , Benjamin, Boucheix , Jean-Michel, Kemeny , Andras, Merienne , Frédéric, Technocentre Renault [Guyancourt], RENAULT, Laboratoire Electronique, Informatique et Image ( Le2i ), Université de Bourgogne ( UB ) -AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement-Centre National de la Recherche Scientifique ( CNRS ), Laboratoire d'Etude de l'Apprentissage et du Développement [Dijon] ( LEAD ), Université de Bourgogne ( UB ) -Centre National de la Recherche Scientifique ( CNRS ), Centre Technique de Simulation, Laboratoire Electronique, Informatique et Image [UMR6306] (Le2i), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement, Laboratoire d'Etude de l'Apprentissage et du Développement [Dijon] (LEAD), and Centre National de la Recherche Scientifique (CNRS)-Université de Bourgogne (UB)

Subjects
Interface homme-machine [Informatique], [ INFO.INFO-HC ] Computer Science [cs]/Human-Computer Interaction [cs.HC], Synthèse d'image et réalité virtuelle [Informatique], Human-machine interface, [INFO.INFO-HC]Computer Science [cs]/Human-Computer Interaction [cs.HC], Range anxiety, [ INFO.INFO-GR ] Computer Science [cs]/Graphics [cs.GR], Electric vehicle, [INFO.INFO-GR]Computer Science [cs]/Graphics [cs.GR]
Abstract

Analysis of driver behavior has been the purpose of many studies for several years. A new aspect is the introduction of electric vehicles on the car market and the fact drivers are more concerned with their consumptions in EV (Electric Vehicle) due to the lack of the appropriate infrastructures. However, only a few studies focusing on ecological behavior and consumption have been carried out. The primary goal of the present study was to assess empirically the impact of feedback on EV driving behavior involving autonomy management performance. We hypothesized that we could help the driver to manage his autonomy more efficiently if we’d give him feedback on his driving behavior and battery consumption. Our second hypothesis is that participants would allocate more attention on feedback information when they reach a critical battery autonomy situation, so the subjects had to drive a course with 100% and 15% autonomy left. Preliminary results indicate better driver performances and enhanced safety with econometer gauge feedback, probably due to the increased driver control and better applied driver attention.; International audience; Analysis of driver behavior has been the purpose of many studies for several years. A new aspect is the introduction of electric vehicles on the car market and the fact drivers are more concerned with their consumptions in EV (Electric Vehicle) due to the lack of the appropriate infrastructures. However, only a few studies focusing on ecological behavior and consumption have been carried out. The primary goal of the present study was to assess empirically the impact of feedback on EV driving behavior involving autonomy management performance. We hypothesized that we could help the driver to manage his autonomy more efficiently if we’d give him feedback on his driving behavior and battery consumption. Our second hypothesis is that participants would allocate more attention on feedback information when they reach a critical battery autonomy situation, so the subjects had to drive a course with 100% and 15% autonomy left. Preliminary results indicate better driver performances and enhanced safety with econometer gauge feedback, probably due to the increased driver control and better applied driver attention.

Published
2021

45. Thermospectroscopic Infrared Imaging of a Confined Drying Process

Author

S. Chevalier, Jacques Leng, E. Abisset, Alain Sommier, M. Lehtihet, Christophe Pradere, Laboratoire du Futur (LOF), Centre National de la Recherche Scientifique (CNRS), Institut de Mécanique et d'Ingénierie de Bordeaux (I2M), Institut National de la Recherche Agronomique (INRA)-Université de Bordeaux (UB)-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, and HESAM Université (HESAM)-HESAM Université (HESAM)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials science, Infrared, General Chemical Engineering, Infrared imaging, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, Industrial and Manufacturing Engineering, Colloid, [SPI]Engineering Sciences [physics], Thermal, Environmental Chemistry, Image resolution, Inverse method, Thermospectroscopy, Confined drying, Silica dispersion, Drop (liquid), General Chemistry, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Computational physics, Transport properties, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Imaging technique, [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph], 0210 nano-technology, Transport phenomena, [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft]
Abstract

International audience; • InfraRed imaging technique for compositional and thermal mapping of transient systems. • Application to a drying droplet of silica dispersion confined between two hydrophobic substrates. • Colloids redistribution due to inhomogeneous drying is highlighted and accurately described. • A numerical statistical inverse method is used to retrieve mutual diffusion coefficient as transient maps. We present an infrared (IR) imaging technique that allows us to retrieve quantitative concentration and thermal maps with relatively fast acquisition times for samples that are evolving in time and have micron-scale spatial resolution. As a proof-of-concept, we image the transient drying kinetics of a μL drop of colloidal suspension in a confined geometry. Quantitative concentration maps inside the drying droplet are retrieved. Transport phenomena such as colloid redistribution inside the droplet due to inhomogeneous drying can be highlighted by this means. A numerical inverse method based on the acquired images that allows one to estimate intrinsic properties of the studied material, such as the collective diffusion coefficient of the mixture, is presented. Such a technique combined with statistical inverse methods provides a useful, non-invasive means of visualizing and estimating parameters of materials evolving in time.

Published
2021

46. Méthodes Level Set pour l'interaction fluide-structure

Author

Thomas Milcent, Georges-Henri Cottet, Emmanuel Maitre, Equations aux Dérivées Partielles (EDP), Laboratoire Jean Kuntzmann (LJK), Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Institut de Mécanique et d'Ingénierie de Bordeaux (I2M), Institut National de la Recherche Agronomique (INRA)-Université de Bordeaux (UB)-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS), Institut de Mécanique et d'Ingénierie (I2M), Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Arts et Métiers Sciences et Technologies, and HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)

Subjects
[PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph], [SPI.MECA.SOLID]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Solid mechanics [physics.class-ph], [MATH.MATH-NA]Mathematics [math]/Numerical Analysis [math.NA]
Abstract

International audience; Les modèles eulériens sont devenus dans les quinze dernières années des outils populaires pour étudier les interactions fluide-structure, car, au contraire des méthodes plus classiques de type ALE, ils permettent de résoudre numériquement ces problèmes en se ramenant à une grille et une méthode de résolution unique pour les différents milieux.Ce livre s’intéresse à cette classe de modèles en adoptant le point de vue original des méthodes level-set, utilisées à la fois pour suivre les interfaces fluide-solide, représenter les contraintes élastiques des solides et modéliser les forces de contact entre solides. Il combine un éclairage mathématique des modèles, des aspects d’analyse numérique, des codes élémentaires et des illustrations numériques permettant au lecteur de se faire une idée des domaines d’application et des performances de ces modèles.Les pré-requis nécessaires pour profiter pleinement de son contenu font partie du bagage scientifique d’élèves de niveau master en mathématiques appliquées ou mécanique théorique. Il sera un outil pédagogique fructueux pour des cours de deuxième année de master ou de début de thèse, ainsi que pour des chercheurs voulant aborder ou approfondir ce domaine.

Published
2021

47. Hardware/Software Implementation of Image Processing Systems Based on ARM Processor

Author

Messaoudi, Kamel, Hakim, Doghmane, Bourouba, Houcine, Bourennane, El-Bay, Toumi, Salah, Mohamed Cherif Messaadia University - Université Mohamed-Chérif Messaadia [Souk Ahras], Laboratoire Problèmes Inverses, Modélisation, Information et Systèmes (PI:MIS), Université de Guelma (PI:MIS), Université du 8 Mai 1945 [Guelma, Algérie], Laboratoire Electronique, Informatique et Image [UMR6306] (Le2i), Université de Bourgogne (UB)-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Etude et de Recherche en Instrumentation et en Communication d'Annaba (LERICA), Université Badji Mokhtar - Annaba [Annaba] (UBMA), and université de Bourgogne, IMVIA

Subjects
Image processing, ARM processor, XSG, [INFO.INFO-GR] Computer Science [cs]/Graphics [cs.GR], Hardware/software implementation, Xilinx-ZedBoard, [INFO.INFO-GR]Computer Science [cs]/Graphics [cs.GR]
Abstract

International audience; In this paper we present a hardware/software platform for real-time image processing. We start with the creation of the hardware part based on the ARM processor (PS) with various drivers (PL) for reading, recording and displaying images. Using the SDK tool (Software Development Kit), we add software parts for the realization of some basic image processing algorithms. We use the Xilinx-VIVADO2016 tool for the proposed system design and we use the rapid development board (Xilinx-ZedBoard) for practical implementations. To realize the principle of codesign, we add hardware IPs (RTL level) for the implementation of the same image processing algorithms. To avoid the details of the HDL design, we use self-generated implementations given by the high-level tool named XSG (Xilinx-System-Generator). Various simulations are carried out firstly under XSG for the functional verification of the proposed accelerators before integrating them into the PL part of the proposed system. At this level, a software part is also developed to ensure coordination between the different hardware parts.

Published
2020

48. Silica nanoparticles to image cells in water by picosecond ultrasonics

Author

Ponge, Marie-Fraise, Bruno, François, Liu, Liwang, Ravaine, Serge, Audoin, Bertrand, Institut de Mécanique et d'Ingénierie (I2M), Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM), Institut de Mécanique et d'Ingénierie de Bordeaux (I2M), Institut National de la Recherche Agronomique (INRA)-Université de Bordeaux (UB)-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS), Centre de Recherche Paul Pascal (CRPP), Université de Bordeaux (UB)-Centre National de la Recherche Scientifique (CNRS), Centre de résonance magnétique biologique et médicale (CRMBM), Assistance Publique - Hôpitaux de Marseille (APHM)-Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), Hôpital de la Timone [CHU - APHM] (TIMONE), and Université de Bordeaux (UB)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.MECA.VIBR]Physics [physics]/Mechanics [physics]/Vibrations [physics.class-ph], Opto-acoustics, Nanoparticules, Cell mechanics, Brillouin scattering, [PHYS.MECA.ACOU]Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph]
Abstract

International audience; Picosecond acoustics enable the mechanical characterization of transparent media by means of Time Domain Brillouin Scattering (TDBS) detection in the GHz frequency range and at the micrometer scale1. This technique is based on the interferences of a probe light with a propagating acoustic wave. We have demonstrated recently that silica nanoparticules, whose size matches the wavelength of phonons at the Brillouin frequency, can be used to discriminate the Brillouin oscillations in a soft transparent medium immersed in water2. Indeed, the multiple scattering of waves cancels the coherent acoustic propagation in water and consequently attenuates the Brillouin oscillations in the fluid whereas the Brillouin signature of the transparent medium remains unaffected. For ten years3, picosecond ultrasonics has been used to image the mechanics of biological cells. However, until now for most experimental achievements, the cells are fixed and dried on the opto-acoustic transducers. Few experiments have been done with immersed cells4-5 whereas it is an essential step toward the achievement of the characterization of living cells. In this work, we present experimental results of the use of a sediment of nanoparticules to improve the imaging of an immersed cell in water. [1] V. Gusev and P. Ruello, Appl. Phys. Rev. 5(3), 031101 (2018). [2 ] M.-F. Ponge, L. Liu, C. Aristégui, and B. Audoin, Appl. Phys. Lett. 115, 133101 (2019). [3] C. Rossignol, N. Chigarev, M. Ducousso, B. Audoin, G. Forget, F. Guillemot, and M. C. Durrieu, Appl. Phys. Lett. 93, 123901 (2008). [4] S. Danworaphong, M. Tomoda, Y. Matsumoto, O. Matsuda, T. Ohashi, H. Watanabe, M. Nagayama, K. Gohara, P. H. Otsuka, and O. B. Wright, Appl. Phys. Lett. 106, 163701 (2015). [5] F. Perez-Cota, R. J. Smith, E. Moradi, L. Marques, K. F. Webb, and M. Clark, Sci. Rep. 6, 39326 (2016).

Published
2020

49. Biomedical applications of the picosecond opto-acoustic microscopy

Author

Audoin, Bertrand Bertrand, Liu, Liwang, Institut de Mécanique et d'Ingénierie de Bordeaux (I2M), Institut National de la Recherche Agronomique (INRA)-Université de Bordeaux (UB)-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, and HESAM Université (HESAM)-HESAM Université (HESAM)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.MECA.VIBR]Physics [physics]/Mechanics [physics]/Vibrations [physics.class-ph], [PHYS.MECA.ACOU]Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph]
Abstract

International audience; Picosecond optoacoustic microscopy is a technique that allows imaging single cells with an in-plane resolution limited by optics and with the mechanical properties as the contrast mechanism.[1,2] In this talk, the basic principles involved in single cell picosecond ultrasonics will be briefly reminded, and the large variety of physical parameters that can be extracted from a single signal will be illustrated. Using a pulsed opto-acoustic microscope we produce notably high-resolution images of the stiffness and adhesion of single migrating cells. The technique is also capable to image cell 3D morphology with an out-of-plane accuracy down to a tenth of the optical wavelength.[3] This capability will be illustrated with the measurement of the 3D morphology of an entire osteosarcoma cell. The mapping complies with the image obtained by standard atomic force microscopy for the same cell, and both reveal very close roughness mean values. These results open perspectives for the morphological phenotyping of cancer cells. This opto-acoustic modality was inserted on a regular upright microscope, making it handy to cooperate with the built-in bright field and with fluorescence microscopies.

Published
2020

50. Gas flow through a bore-piston ring contact

Author

Gerald Senger, Didier Lasseux, Baptiste Hallouin, Institut de Mécanique et d'Ingénierie de Bordeaux (I2M), Institut National de la Recherche Agronomique (INRA)-Université de Bordeaux (UB)-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS), and ANR-11-RSNR-0012,MACENA,Maitrise du confinement d'une enceinte en accident(2011)

Subjects
Physics, Work (thermodynamics), Mathematical model, Basis (linear algebra), 020209 energy, Mechanical Engineering, [SPI.FLUID]Engineering Sciences [physics]/Reactive fluid environment, Aerospace Engineering, Ocean Engineering, 02 engineering and technology, Mechanics, Ring (chemistry), analytical solution, Reciprocating motion, [SPI]Engineering Sciences [physics], 020303 mechanical engineering & transports, 0203 mechanical engineering, Flow (mathematics), Automotive Engineering, 0202 electrical engineering, electronic engineering, information engineering, Piston ring, Gas compressor, Gas blow-by, bore-piston ring contact
Abstract

This work reports on the derivation of simplified but accurate models to describe gas flow through a bore-piston ring contact in reciprocating machines like compressors or IC engines. On the basis of the aperture field of a contact deduced from real measurements carried out on an expanding ring in a bore, a scale analysis on the complete compressible flow model is performed, assuming ideal gas law. It is shown that the flow can be treated as stationary and three distinct flow regimes can be identified (namely incompressible, compressible creeping, and compressible inertial regimes). Three dimensionless parameters characterizing these regimes are identified. While for the two former regimes, classical analytical Poiseuille type of models are derived, an Oseen approximation is further employed for the latter, yielding a quasi-analytical solution. The models are successfully compared to direct numerical simulations (DNS) of the complete initial set of balance equations in their steady form performed on an aperture field of sinusoidal shape. These simplified models are of particular practical interest since they allow an accurate gas flow-rate estimate through a real contact using the aperture field as the geometrical input datum, together with the thermodynamic conditions (pressure and temperature). This represents an enormous advantage as DNS is still very challenging in practice due to the extremely small value of the contact aperture to contact length ratio.

Published
2020

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