10 results on '"Alexei Evstratov"'
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2. 3D Printing and Mechanical Properties of Polyamide Products with Schwartz Primitive Topology
- Author
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Arnaud Regazzi, José-Marie Lopez-Cuesta, S. V. Balabanov, M. M. Sychev, Alexei Evstratov, A. I. Makogon, Grebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences, St. Petersburg State Technological Institute, Polymères Composites et Hybrides (PCH - IMT Mines Alès), IMT - MINES ALES (IMT - MINES ALES), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Durabilité des éco-Matériaux et Structures (DMS), Laboratoire de Mécanique et Génie Civil (LMGC), and Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-IMT - MINES ALES (IMT - MINES ALES)
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010302 applied physics ,Materials science ,Physics and Astronomy (miscellaneous) ,business.industry ,3D printing ,Sintering ,[CHIM.MATE]Chemical Sciences/Material chemistry ,Compression (physics) ,01 natural sciences ,Finite element method ,010305 fluids & plasmas ,Structural element ,law.invention ,Specific strength ,Selective laser sintering ,law ,0103 physical sciences ,Honeycomb ,Composite material ,business - Abstract
International audience; The results of a study of the mechanical properties of the honeycomb material made of polyamide-12, which consists of structural elements that repeat in three directions and have Schwartz primitive geometry, are presented. Samples in the form of a cube (size 30 × 30 × 30 mm) are obtained by layer-by-layer sintering of powder material on a 3D printer of selective laser sintering (SLS) type. Compression tests of samples with various geometry show that the strength of the samples increases with a decrease in the characteristic size of the repeating structural element. According to the calculations performed by the finite element method, this is caused by an increase in the dangerous sectional area. The possibility of a significant increase in the specific strength of the material while maintaining its density is shown.
- Published
- 2020
- Full Text
- View/download PDF
3. Mechanical Properties of Cellular Structures with Schwartz Primitive Topology
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Lev A. Lebedev, Alexei Evstratov, Jose-Marie Lopez-Cuesta, Arnaud Regazzi, Maxim Sychov, Institute of Silicate Chemistry, Russian Academy of Sciences, Saint Petersburg State Institute of Technology (Technical University), Centre des Matériaux des Mines d'Alès (C2MA), IMT - MINES ALES (IMT - MINES ALES), and Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)
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010302 applied physics ,Work (thermodynamics) ,Materials science ,Minimal surface ,Current (mathematics) ,Spacecraft ,business.industry ,Additive manufacturing ,Mechanical properties ,010403 inorganic & nuclear chemistry ,Topology ,Scale factor ,01 natural sciences ,7. Clean energy ,0104 chemical sciences ,law.invention ,Selective laser sintering ,[SPI]Engineering Sciences [physics] ,TPMS ,law ,0103 physical sciences ,Triply periodic minimal surface ,business ,Topology (chemistry) - Abstract
International audience; Cellular structures with triply periodic minimal surface (TPMS) topology are studied in current research work. Previously, it was shown that materials with TPMS topology have a potential as a lightweight material in energy-absorbing systems that can be used in various applications such as protective layer landing pods of spacecraft. In this work Schwartz primitive structure was chosen to study the influence of scale factor, unit number on mechanical properties. Samples were made by selective laser sintering process of polyamide powder and tested on Walter+bai ag LFM − 400 kN machine.
- Published
- 2019
- Full Text
- View/download PDF
4. Exploring the antimicrobial properties of dark-operating ceramic-based nanocomposite materials for the disinfection of indoor air
- Author
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Lionel Sabourin, Alexei Evstratov, Arnaud Frering, Sandrine Bayle, Jose-Marie Lopez-Cuesta, Aliénor Dutheil de la Rochère, Centre des Matériaux des Mines d'Alès (C2MA), IMT - MINES ALES (IMT - MINES ALES), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Pôle RIME - Recherche sur les Interactions des Matériaux avec leur Environnement (RIME), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-IMT - MINES ALES (IMT - MINES ALES), Laboratoire de Génie de l'Environnement Industriel (LGEI), and European Project: 690968,H2020,H2020-MSCA-RISE-2015,NANOGUARD2AR(2016)
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Chemical Radicals ,Ceramics ,Polymers ,Diffusion ,Composite number ,02 engineering and technology ,01 natural sciences ,Biochemistry ,Physical Chemistry ,Nanocomposites ,[SPI.MAT]Engineering Sciences [physics]/Materials ,Oxidative Damage ,Oxidizing agent ,Aluminum Oxide ,Electron Microscopy ,Ceramic ,Hydroxyl Radicals ,Polyvinyl Chloride ,Materials ,ComputingMilieux_MISCELLANEOUS ,Microscopy ,Multidisciplinary ,[SDE.IE]Environmental Sciences/Environmental Engineering ,Physics ,Abrasive ,Classical Mechanics ,021001 nanoscience & nanotechnology ,Antimicrobial ,Dynamics ,Anti-Bacterial Agents ,Chemistry ,Zinc ,Flow conditions ,Macromolecules ,visual_art ,Air Flow ,Air Pollution, Indoor ,Physical Sciences ,visual_art.visual_art_medium ,Medicine ,Scanning Electron Microscopy ,0210 nano-technology ,Research Article ,Chemical Elements ,Materials science ,Science ,Materials Science ,010402 general chemistry ,Research and Analysis Methods ,Aerodynamics ,Humans ,Indoor air, disinfection, germicidal composites ,Manganese ,Nanocomposite ,Bacteria ,Biology and Life Sciences ,Polymer Chemistry ,0104 chemical sciences ,Disinfection ,Chemical engineering ,Manganese Compounds ,Composite Materials ,Reactive Oxygen Species ,Disinfectants - Abstract
As people spend more and more time inside, the quality of indoor air becomes crucial matter. This study explores the germicidal potential of two dark-operating germicidal composite materials designed to be applied for the indoor air disinfection under flow conditions. The first material, MnO 2 /AlPO 4 /γ-Al 2 O 3 beads, is a donor-acceptor interactive composite capable of creating hydroxyl radicals HO.. The second one is a ZnO/γ-Al 2 O 3 material with inter-cropped hexagons on its surface. To determine the antimicrobial efficiency of these materials in lifelike conditions, a pilot device was constructed that allows the test of the materials in dynamic conditions and agar diffusion inhibitory tests were also conducted. The results of the tests showed that the MnO 2 /AlPO 4 /γ-Al 2 O 3 material has a germicidal effect in static conditions whereas ZnO/γ-Al 2 O 3 does not. In dynamic conditions, the oxidizing MnO 2 / AlPO 4 /γ-Al 2 O 3 material is the most efficient when using low air speed whereas the ZnO/γ-Al 2 O 3 one becomes more efficient than the other materials when increasing the air linear speed. This ZnO/γ-Al 2 O 3 dark-operating germicidal material manifests the ability to proceed the mechanical destruction of bacterial cells. Actually, the antimicrobial efficiency of materials in dynamic conditions varies regarding the air speed through the materials and that static tests are not representative of the behavior of the material for air disinfection. Depending on the conditions, the best strategy to inactivate microorganisms changes and abrasive structures are a field that needs further exploration as they are in most of the conditions tested the best way to quickly decrease the number of microorganisms.
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- 2019
- Full Text
- View/download PDF
5. Patois, Emotional Ties, and the Peasant Question. Staging the Rustic in 1760s Russia
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Alexei Evstratov, Freie Universität Berlin, Ananka, Yaraslava, and Marszalek, Magdalena
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Literature ,Painting ,History ,business.industry ,media_common.quotation_subject ,Sympathy ,Agency (sociology) ,St petersburg ,Character (symbol) ,business ,[SHS.HIST]Humanities and Social Sciences/History ,Peasant ,media_common - Abstract
International audience; From the mid-18th century onwards, the decorative images of land-workers cultivated in the court pastoral have been submitted to a series of reevaluations in fictional texts and economic treatises. These new representations contrasted with the genre paintings of the Northern school and comically condescending literary depictions insofar as they integrated sympathy into the revised version of the rapport between the reader (spectator) and the peasant characters. This study focuses on a new critical agency that the peasant character was granted in the dramatic texts presented to the audience of the court theatre in St Petersburg in the mid-1760s.
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- 2018
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- View/download PDF
6. The Europeanized Elite in Russia, 1762–1825 : Public Role and Subjective Self
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Andreas Schönle, Andrei Zorin, Alexei Evstratov, Andreas Schönle, Andrei Zorin, and Alexei Evstratov
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- Elite (Social sciences)--Russia--History--19th century, Elite (Social sciences)--Russia--History--18th century
- Abstract
This illuminating volume provides a new understanding of the subjective identity and public roles of Russia's Europeanized elite between the years of 1762 and 1825. Through a series of rich case studies, the editors reconstruct the social group's worldview, complex identities, conflicting loyalties, and evolving habits. The studies explore the institutions that shaped these nobles, their attitude to state service, the changing patterns of their family life, their emotional world, religious beliefs, and sense of time.The creation of a Europeanized elite in Russia was a state-initiated project that aimed to overcome the presumed'backwardness'of the country. The evolution of this social group in its relations to political authority provides insight into the fraught identity of a country developing on the geopolitical periphery of Europe. In contrast to postcolonial studies that explore the imposition of political, social, and cultural structures on colonized societies, this multidisciplinary volume explores the patterns of behavior and emotion that emerge from the processes of self-Europeanization. The Europeanized Elite in Russia, 1762–1825, will appeal to scholars and general readers interested in Russian history and culture, particularly in light of current political debates about globalization and widening social inequality in Europe.
- Published
- 2017
7. Studying the thermo-oxidative stability of chars using pyrolysis-combustion flow calorimetry
- Author
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Rodolphe Sonnier, Cai Heruijing, Jean-Claude Roux, Charlene Presti, Loïc Dumazert, Amandine Viretto, Henri Vahabi, Belkacem Otazaghine, Johan G. Alauzun, Alexei Evstratov, P. Hubert Mutin, Centre des Matériaux des Mines d'Alès (C2MA), IMT - MINES ALES (IMT - MINES ALES), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Pôle Matériaux Polymères Avancés (Pôle MPA), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-IMT - MINES ALES (IMT - MINES ALES), Université Paris-Sorbonne (UP4), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC), Laboratoire Matériaux Optiques, Photonique et Systèmes (LMOPS), and CentraleSupélec-Université de Lorraine (UL)
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Materials science ,Polymers and Plastics ,Charring ,chemistry.chemical_element ,Fraction (chemistry) ,02 engineering and technology ,Calorimetry ,010402 general chemistry ,Combustion ,01 natural sciences ,Oxygen ,Thermo-oxidative stability ,Materials Chemistry ,Organic chemistry ,Thermal stability ,Char ,ComputingMilieux_MISCELLANEOUS ,[CHIM.MATE]Chemical Sciences/Material chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,0104 chemical sciences ,[CHIM.POLY]Chemical Sciences/Polymers ,chemistry ,Chemical engineering ,13. Climate action ,Mechanics of Materials ,Phosphorus flame retardants ,0210 nano-technology ,Pyrolysis-combustion flow calorimetry ,Pyrolysis - Abstract
A method to estimate the thermo-oxidative stability of chars is proposed using pyrolysis-combustion flow calorimetry. The temperature of char degradation is measured for different oxygen fractions (from 0.01 to 0.4, i.e. from 0 to 40%) into the pyrolyzer. Then the thermo-oxidative stability versus the oxygen fraction is modelled using a simple phenomenological equation. Two parameters have been calculated: the first one predicts the temperature of char degradation in “pure” oxygen and the second one corresponds to the sensitivity of the char degradation temperature to the oxygen fraction. These two parameters allow comparing the chars obtained from different materials after various pyrolysis procedures. Rough relationships between these two parameters and the elemental composition of char are identified. Phosphorus allows improving the thermo-oxidative stability of chars as expected but its effect is nonlinear. Lignocellulosic materials lead to chars with low thermal stability even when the phosphorus content is high. Finally, the obtained results show that the char elemental composition is not the only parameter influencing its thermo-oxidative stability.
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- 2016
- Full Text
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8. Advances in design and modelling of porous materials
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André Ayral, Sylvie Etienne-Calas, Benoit Coasne, Andre Deratani, Alexei Evstratov, Anne Galarneau, Daniel Grande, Matthieu Hureau, Hervé Jobic, Catherine Morlay, Julien Parmentier, Benedicte Prelot, Sylvie Rossignol, Simon-Masseron Angélique, Frederic Thibault-Starzyk, Institut Européen des membranes (IEM), Université Montpellier 2 - Sciences et Techniques (UM2)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sorbonne (UP4), Institut de Chimie et des Matériaux Paris-Est (ICMPE), Institut de Chimie du CNRS (INC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement - UMR 8516 (LASIRE), Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Institut de recherches sur la catalyse et l'environnement de Lyon (IRCELYON), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Matériaux, ingénierie et science [Villeurbanne] (MATEIS), 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), Institut de Science des Matériaux de Mulhouse (IS2M), Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS), Axe 3 : organisation structurale multiéchelle des matériaux (SPCTS-AXE3), Science des Procédés Céramiques et de Traitements de Surface (SPCTS), Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Matériaux à Porosité Contrôlée (LMPC), Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Ecole Nationale Supérieure de Chimie de Mulhouse-Centre National de la Recherche Scientifique (CNRS), Laboratoire catalyse et spectrochimie (LCS), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Calas-Etienne, Sylvie, Centre National de la Recherche Scientifique (CNRS)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC), Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Centrale Lille Institut (CLIL), Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Institut de Chimie du CNRS (INC)-Université de Caen Normandie (UNICAEN), Normandie Université (NU), Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et Nanosciences Grand-Est (MNGE), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, and Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] ,[PHYS.COND.CM-MS] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] ,ComputingMilieux_MISCELLANEOUS - Abstract
International audience
- Published
- 2014
9. Exploring the antimicrobial properties of dark-operating ceramic-based nanocomposite materials for the disinfection of indoor air.
- Author
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Aliénor Dutheil de la Rochère, Alexeï Evstratov, Sandrine Bayle, Lionel Sabourin, Arnaud Frering, and José-Marie Lopez-Cuesta
- Subjects
Medicine ,Science - Abstract
As people spend more and more time inside, the quality of indoor air becomes crucial matter. This study explores the germicidal potential of two dark-operating germicidal composite materials designed to be applied for the indoor air disinfection under flow conditions. The first material, MnO2/AlPO4/γ-Al2O3 beads, is a donor-acceptor interactive composite capable of creating hydroxyl radicals HO∙. The second one is a ZnO/γ-Al2O3 material with intercropped hexagons on its surface. To determine the antimicrobial efficiency of these materials in life-like conditions, a pilot device was constructed that allows the test of the materials in dynamic conditions and agar diffusion inhibitory tests were also conducted. The results of the tests showed that the MnO2/AlPO4/γ-Al2O3 material has a germicidal effect in static conditions whereas ZnO/γ-Al2O3 does not. In dynamic conditions, the oxidizing MnO2/AlPO4/γ-Al2O3 material is the most efficient when using low air speed whereas the ZnO/γ-Al2O3 one becomes more efficient than the other materials when increasing the air linear speed. This ZnO/γ-Al2O3 dark-operating germicidal material manifests the ability to proceed the mechanical destruction of bacterial cells. Actually, the antimicrobial efficiency of materials in dynamic conditions varies regarding the air speed through the materials and that static tests are not representative of the behavior of the material for air disinfection. Depending on the conditions, the best strategy to inactivate microorganisms changes and abrasive structures are a field that needs further exploration as they are in most of the conditions tested the best way to quickly decrease the number of microorganisms.
- Published
- 2019
- Full Text
- View/download PDF
10. Russian Prince vs. 'German Swine': Public Slap in the Face, Émigrés, and Local Elites in St. Petersburg at the Time of the French Revolution
- Author
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Alexei Evstratov, University of Oxford [Oxford], Schönle, Andreas, Zorin, Andreas, and Evstratov, Alexei
- Subjects
[SHS.HIST]Humanities and Social Sciences/History - Abstract
International audience; The case studied in this chapter deals with the social sphere located between the official cosmopolitanism promoted by the court and rivalries and tensions characteristic of professional corporations. The critical reappraisal of interactions between foreigners and local elites nuances the opposition between aristocratic cosmopolitanism and nascent nationalism—an opposition that informs social and cultural histories of the Russian nobility (Greenfeld 1990). How did Russian nobles feel about their foreign peers who had to leave their country and to abandon property (and rent), and who came to Russia to enjoy ranks, pensions, and honors dispensed by the imperial court? Did the local elite pride itself on its new capacity as the host offering refuge to those who, until recently, pretended to be the role model of the civilized world? These questions will guide my essay in the social history of perceptions of Europeans among Russian elites.
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