7 results on '"okus"'
Number of results to display per page
Search Results
2. A class of weakly regular Lp-well-posed linear systems
- Author
-
Fouad Maragh, Bounit Hamid, Hassan Hammouri, Université Ibn Zohr [Agadir], Laboratoire d'automatique et de génie des procédés (LAGEP), Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-École Supérieure Chimie Physique Électronique de Lyon-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Discrete mathematics ,Well-posed problem ,0209 industrial biotechnology ,Class (set theory) ,ACL ,010102 general mathematics ,Linear system ,General Engineering ,Boundary (topology) ,02 engineering and technology ,State (functional analysis) ,Type (model theory) ,01 natural sciences ,Dual (category theory) ,[SPI.AUTO]Engineering Sciences [physics]/Automatic ,020901 industrial engineering & automation ,OKUS ,Control system ,[INFO.INFO-AU]Computer Science [cs]/Automatic Control Engineering ,[SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering ,0101 mathematics ,ComputingMilieux_MISCELLANEOUS ,Mathematics - Abstract
We consider the weak regularity problem of Lp-well-posed linear systems ( 1 ≤ p ∞ ) in Banach state spaces when its associated unbounded controllers take values in the extrapolated Favard class. We prove that this type of Lp-well-posed linear systems are weakly regular, and this regularity is output operators independent up to the well-posedness, provided that the adjoint of the underlying semigroups is strongly continuous on its dual. We present some applications of our results to a class of boundary control systems and a class of well-posed bilinear systems recently introduced in [2] .
- Published
- 2015
3. A Theoretical Comparative Study Between Open Cell Foam and Conventional Packed Bed in Externally Cooled Multitubular Fixed-Bed Reactors for the C1 Chemistry
- Author
-
David Edouard, Pascal Fongarland, Meryem Saber, Université de Strasbourg (UNISTRA), Laboratoire de Physique des Matériaux et Modélisation des Systèmes (LP2MS), Université Moulay Ismail (UMI), BIOVERT (BIOVERT), Institut de recherches sur la catalyse et l'environnement de Lyon (IRCELYON), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Laboratoire d'automatique et de génie des procédés (LAGEP), and Université de Lyon-Université de Lyon-École Supérieure Chimie Physique Électronique de Lyon-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Pressure drop ,Packed bed ,Work (thermodynamics) ,Materials science ,ACL ,Analytical chemistry ,Context (language use) ,General Medicine ,Mechanics ,7. Clean energy ,[SPI.AUTO]Engineering Sciences [physics]/Automatic ,[SPI]Engineering Sciences [physics] ,Thermal conductivity ,Flow velocity ,OKUS ,[INFO.INFO-AU]Computer Science [cs]/Automatic Control Engineering ,Thermal ,[SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering ,Porosity ,ComputingMilieux_MISCELLANEOUS - Abstract
International audience; The open cell foams are likely to be the next generation of catalyst supports due to their interesting specific properties (large exchange area, easy control of external porosity, etc.). In multitubular packed-bed reactors used for the C1 chemistry which constitute the focus of this work, it is well known that the removal of the reaction heat and the pressure drop are the most critical aspects for planning and designing chemical engineering processes. In this context, the objective of the present work is to compare the 'conventional' SiC spherical particles bed and SiC open cell foam bed for the C1 chemistry. From simulations, this work allows observing and quantifying the influences of the fluid velocity and the type of catalyst used (foam or packed bed) on the properties of transport. The observed responses are the total effective thermal conductivity and the pressure drop. The results indicate that it will be necessary to tune the void fraction and morphological parameters of the open cell foam in order to obtain the best compromise between pressure drop and a good thermal behavior.
- Published
- 2013
4. An observer design for a class of implicit systems
- Author
-
Hassan Hammouri, Madiha Nadri, Laboratoire d'automatique et de génie des procédés (LAGEP), Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-École Supérieure Chimie Physique Électronique de Lyon-Centre National de la Recherche Scientifique (CNRS)
- Subjects
0209 industrial biotechnology ,General Computer Science ,Observer (quantum physics) ,Mechanical Engineering ,ACL ,Explicit and implicit methods ,Initialization ,02 engineering and technology ,[SPI.AUTO]Engineering Sciences [physics]/Automatic ,Nonlinear system ,020901 industrial engineering & automation ,Control and Systems Engineering ,Control theory ,OKUS ,Ordinary differential equation ,[INFO.INFO-AU]Computer Science [cs]/Automatic Control Engineering ,0202 electrical engineering, electronic engineering, information engineering ,020201 artificial intelligence & image processing ,[SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering ,State observer ,Affine transformation ,Electrical and Electronic Engineering ,Variable (mathematics) ,Mathematics - Abstract
International audience; This paper deals with the problem of observer design for a class of implicit nonlinear systems of index one. To solve this problem, an implicit observer which is given by an implicit system is usually used. The implementation of this kind of observer requires an optimization algorithm to solve at each time the algebraic constraints. Alternatively, an explicit observer which is described by an ordinary differential equation can be used. The advantage of this approach is that no optimization algorithm is required. Moreover the observer initialization may be done outside the constraints. In this paper it is shown that, under some conditions, the existence of an implicit observer implies the existence of an explicit one. Then, an explicit observer is given for implicit state affine systems whose dynamic involves an additional nonlinear term depending on the input, the output and the implicit variable.
- Published
- 2013
5. Chapter 13 Polymer\textendashClay Nanocomposite Particles and Soap-free Latexes Stabilized by Clay Platelets: State of the Art and Recent Advances
- Author
-
Bourgeat-Lami, Elodie, Sheibat-Othman, Nida, Santos, Amilton Martins Dos, LCPP, Laboratoire de Chimie, Catalyse, Polymères et Procédés, R 5265 (C2P2), Centre National de la Recherche Scientifique (CNRS)-École supérieure de Chimie Physique Electronique de Lyon (CPE)-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)-École supérieure de Chimie Physique Electronique de Lyon (CPE)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC), Laboratoire d'automatique et de génie des procédés (LAGEP), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-École Supérieure Chimie Physique Électronique de Lyon-Centre National de la Recherche Scientifique (CNRS), Escola de Engenharia de Lorena (EEL), and Universidade de São Paulo (USP)
- Subjects
OKUS ,[INFO.INFO-AU]Computer Science [cs]/Automatic Control Engineering ,OS ,[SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering ,ComputingMilieux_MISCELLANEOUS ,[SPI.AUTO]Engineering Sciences [physics]/Automatic - Abstract
International audience
- Published
- 2010
6. A nonlinear canonical form for reduced order observer design
- Author
-
Driss Boutat, Hassan Hammouri, Gang Zheng, Laboratoire Pluridisciplinaire de Recherche en Ingénierie des Systèmes, Mécanique et Energétique (PRISME), Université d'Orléans (UO)-Ecole Nationale Supérieure d'Ingénieurs de Bourges (ENSI Bourges), Algebra for Digital Identification and Estimation (ALIEN), Inria Lille - Nord Europe, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Inria Saclay - Ile de France, Institut National de Recherche en Informatique et en Automatique (Inria)-Centrale Lille-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Systèmes Non Linéaires et à Retards (SyNeR), Centre de Recherche en Informatique, Signal et Automatique de Lille - UMR 9189 (CRIStAL), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'automatique et de génie des procédés (LAGEP), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-École Supérieure de Chimie Physique Électronique de Lyon (CPE)-Centre National de la Recherche Scientifique (CNRS), Lorenzo Marconi, Institut National de Recherche en Informatique et en Automatique (Inria)-Ecole Centrale de Lille-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Automatique, Génie Informatique et Signal (LAGIS), Université de Lille, Sciences et Technologies-Ecole Centrale de Lille-Centre National de la Recherche Scientifique (CNRS), Université de Lyon-Université de Lyon-École Supérieure Chimie Physique Électronique de Lyon-Centre National de la Recherche Scientifique (CNRS), Lorenzo, and Marconi
- Subjects
0209 industrial biotechnology ,Observer (quantum physics) ,010102 general mathematics ,Mathematical analysis ,Canonical form ,02 engineering and technology ,Special class ,01 natural sciences ,Reduced order observer ,Reduced order ,[SPI.AUTO]Engineering Sciences [physics]/Automatic ,ACTI ,Nonlinear system ,020901 industrial engineering & automation ,OKUS ,[INFO.INFO-AU]Computer Science [cs]/Automatic Control Engineering ,[SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering ,0101 mathematics ,ComputingMilieux_MISCELLANEOUS ,Mathematics - Abstract
International audience; This paper presents a nonlinear canonical form which is used for the design of a reduced order observer. Sufficient and necessary geometric conditions are given in order to transform a special class of nonlinear systems to the proposed nonlinear canonical form and the corresponding reduced order observer is analyzed.
- Published
- 2010
7. A lab-scale reaction calorimeter for olefin polymerization
- Author
-
Timothy F. L. McKenna, Nida Sheibat-Othman, Virginie F. Tisse, Laboratoire de Chimie, Catalyse, Polymères et Procédés, R 5265 (C2P2), Centre National de la Recherche Scientifique (CNRS)-École supérieure de Chimie Physique Electronique de Lyon (CPE)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC), Laboratoire d'automatique et de génie des procédés (LAGEP), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-École Supérieure Chimie Physique Électronique de Lyon-Centre National de la Recherche Scientifique (CNRS), and Queen's University [Kingston, Canada]
- Subjects
Chemistry ,ACL ,General Chemical Engineering ,Lab scale ,Thermodynamics ,02 engineering and technology ,Calorimetry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,7. Clean energy ,01 natural sciences ,[SPI.AUTO]Engineering Sciences [physics]/Automatic ,0104 chemical sciences ,Reaction calorimeter ,OKUS ,[INFO.INFO-AU]Computer Science [cs]/Automatic Control Engineering ,Physical chemistry ,Olefin polymerization ,[SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering ,0210 nano-technology ,Solid content ,Heat flow - Abstract
A reaction calorimeter was built to follow slurry-phase polymerizations of ethylene using different types of supported catalysts. It was shown that heat flow calorimetry, employing a high-gain observer for the evaluation of the initial conditions was an extremely useful tool for the measurement of on-line reaction rates, and a study of the influence of different parameters such as the stirring rate or solid content in real time. It was shown that if one uses solid contents under 30% (volume) then it is not necessary to account for the influence of this quantity on the overall heat transfer coefficient. Un calorim'etre de r'eaction a 'et'e construit pour le suivi des polym'erisations des phases de suspension de l''ethyl'ene utilisant diff'erents types de catalyseurs adapt'es. Il a 'et'e d'emontr'e que la calorim'etrie du flux thermique, utilisant un observateur 'a gain 'elev'e pour l''evaluation des conditions initiales s'est av'er'ee un outil extrˆemement utile pour mesurer les taux de r'eaction en ligne, et pour l''etude en temps r'eel de l'influence de diff'erents param'etres tels que la vitesse d'agitation ou le contenu en mati'ere solide. Il a 'et'e d'emontr'e que si l'on utilise la mati'ere solide en dessous de 30% (en termes de volume), alors il n'est pas n'ecessaire de prendre en compte l'influence de cette quantit'e sur le coefficient global de transfert thermique.
- Published
- 2010
Catalog
Books, media, physical & digital resources
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.