检索结果-内蒙古大学图书馆

Which notion of energy for bilinear quantum systems? *

IFAC Proceedings Volumes 2012年第19期45卷 226-230页

作者： Nabile Boussaïd Marco Caponigro Thomas Chambrion Laboratoire de mathématiques Université de Franche-Comté 25030 Besançon France Dept of Mathematical Sciences and Center for Computational and Integrative Biology Rutgers University 08102 Camden NJ USA Université de Lorraine Institut élie Cartan de Nancy UMR 7502 Vandæuvre F-54506 France and INRIA Villers-lès-NancyF-54-600 France INRIA Villers-lès-NancyF-54-600 France

In this note we investigate what is the best L p -norm in order to describe the relation between the evolution of the state of a bilinear quantum system with the L p -norm of the external field. Although L 2 has a structure more easy to handle, the L 1 norm is more suitable for this purpose. Indeed for every p > 1 it is possible to steer, with arbitrary precision, a generic bilinear quantum system from any eigenstate of the free Hamiltonian to any other with a control of arbitrary small L p norm. Explicit optimal costs for the L 1 norm are computed on an example.

关键词： Bilinear systems quantum systems distributed parameters systems optimal control averaging control.

来源：评论

学校读者我要写书评

暂无评论

Hamiltonian approach to the stabilization of systems of two conservation laws

引用

IFAC Proceedings Volumes 2010年第14期43卷 581-586页

作者： V. Dos Santos Martins B. Maschke Y. Le Gorrec LAGEP Université de Lyon Lyon F-69003 France Université Lyon 1 CNRS UMR 5007 LAGEP Villeurbanne F-69622 France ESCPE Villeurbanne F-69622 FEMTO-ST/AS2M ENSMM Besançon 24 rue Alain Savary 25 000 Besançon

This paper aims at providing some synthesis between two alternative representations of systems of two conservation laws and interprets different conditions on stabilizing boundary control laws. The first is the representation in Riemann invariants coordinates whose representation has been applied successfully for the stabilization of linear and non-linear of such hyperbolic systems. The second representation is based on physical modelling and leads to port Hamiltonian systems which are extensions of infinite-dimensional Hamiltonian systems defined on Dirac structure. The stability conditions on the boundary feedback relations derived with respect to the Riemann invariants are interpreted in terms of the dissipation inequality of the Hamiltonian functional.

关键词： Boundary Port Hamiltonian systems distributed parameters systems Stability

来源：评论

学校读者我要写书评

暂无评论

Port-based modelling of mass transport phenomena

引用

MATHEMATICAL AND COMPUTER MODELLING OF DYNAMICAL systems 2009年第3期15卷 233-254页

作者： Baaiu, A. Couenne, F. Eberard, D. Jallut, C. Lefevre, L. Legorrec, Y. Maschke, B. Univ Lyon 1 CNRS UMR 5007 ESCPE LyonLAGEP F-69622 Villeurbanne France

The goal of this article is to present an extension of the port-based modelling approach (bond graphs) which applies to systems subject to heat and mass transfer. The methodology is based on the first principle, conservation laws and constitutive closure relations. The latter are the phenomenological laws relating fluxes and thermodynamic forces. Then instantaneous power conservation appears naturally as a geometric interconnection structure called Dirac structure. The multi-level case (several macroscopic spatial scales) is investigated with the assumption that the spatial scales are separated and may be considered as two distinct phases. In this case, it is shown that both the interconnection coupling within a phase and the multi-level interconnection coupling are Dirac structures.

关键词： distributed parameters systems port-Hamiltonian systems multi-scale modelling thermodynamics bond graphs

来源：评论

学校读者我要写书评

暂无评论

Adaptive extremum seeking control of a non-isothermal tubular reactor with unknown kinetics

引用

COMPUTERS & CHEMICAL ENGINEERING 2005年第4期29卷 839-849页

作者： Hudon, N Perrier, M Guay, M Dochain, D Queens Univ Dept Chem Engn Kingston ON K7L 3N6 Canada Ecole Polytech Dept Genie Chim Montreal PQ H3C 3A7 Canada Catholic Univ Louvain CESAME B-1348 Louvain Belgium

In this paper, we extend recent results on adaptive extrernum seeking control to a class of nonlinear distributed parameter systems. We address the real-time optimization of a chemical reaction that occurs in a tubular reactor described by an hyperbolic set of partial differential equations. An estimation and a control algorithm that take into account temperature constraints are developed based on a Lyapunov functional. We apply the algorithm to the on-line optimization of the Williams-Otto reaction where the kinetics are assumed a priori unknown. The result of this algorithm is a feedback profile control that steers the system to its optimum. (c) 2004 Elsevier Ltd. All rights reserved.

关键词： adaptive extremum seeking distributed parameters systems non-isothermal tubular reactor Williams-Otto reaction

来源：评论

学校读者我要写书评

暂无评论

QUALITATIVE MODELING OF CHEMICAL PROCESSES - A WEIGHTED DIGRAPH (WDG) APPROACH

引用

COMPUTERS & CHEMICAL ENGINEERING 1995年第0期19卷 S375-S380页

作者： VIANNA, RF MCGREAVY, C Department of Chemical Engineering The University of Leeds Leeds LS2 9JT UK

A qualitative reasoning methodology for describing complex chemical process is proposed. It focuses particularly on distributed parameters systems (DPS). This requires a considerable development beyond the techniques currently available for lumped parameters systems. The methodology extends the signed digraph approach due to Iri et al (1979) by incorporating functional weighting derived from estimates of relative sensitivity coefficients. Mass and energy accumulation terms from balance equations and temporal edges are used to capture the dynamic characteristics of the system. The methodology is illustrated by considering the qualitative simulation of two dynamic systems, a tank and a distillation column, when subject to disturbances in the feed flow rate. In general the procedure is able to provide a very satisfactory qualitative description of the dynamic trajectories of the systems and avoid ambiguous solutions. In particular it offers the prospect of being able to anticipate problems at the preliminary process design stage and points to ways of overcoming them.

关键词： PROCESS DYNAMICS QUALITATIVE REASONING distributed parameters systems DISTILLATION COLUMNS ARTIFICIAL INTELLIGENCE DIGRAPHS

来源：评论

学校读者我要写书评

暂无评论

Shape Identification and Boundary Heat Flux Determination. Application to a Phase Change Apparatus

引用

IFAC Proceedings Volumes 1995年第8期28卷 515-520页

作者： S. Péneau J.P. Humeau Y. Jarny A. Sarda Laboratoire d'Automatique de Nantes Ecole Centrale de Nantes 1 rue de la noe 44072 Nantes cedex 03 FRANCE Tel: (33) 40.37.16.00 FAX: (33) 40.37.25.22 Laboratoire de Thermocinétique ISITEM La chantrerie 44087 Nantes cedex 03 FRANCE Tel: (33) 40.68.31.15. FAX: (33) 40.68.31.41

In order to solve an inverse heat conduction problem, a shape identification method for an elliptic problem is devised: the shape of an isothermal part of the boundary of a solid material and the heat flux through this boundary are determined from temperature measurements in the domain or on its boundary. The problem is formulated as a minimization problem; several descent methods are presented and the gradient is computed either by direct calculation or by using an adjoint state. Simulated data, noisy simulated data and experimental data allow a validation of the method and show its robustness. Dans le but de résoudre un problème inverse de conduction thermique, une méthode d'optimisation de forme pour une équation elliptique est développée : la forme d'une partie isotherme de la frontière d'un domaine est déterminée à partir de mesures de temperatures à l'intérieur ou sur la frontière du domaine. Le problème est formulé comme un problème de minimisation. Plusieurs méthodes de descente sont présentées, le gradient est calculé par une méthode directe ou en fonction d'un état adjoint. Des données issues de simulation, puis bruitées et enfin des données expérimentales permettent de valider la méthode et de montrer sa robustesse.

关键词： distributed parameters systems shape identification Pontryagin's principle phase change apparatus

来源：评论

学校读者我要写书评

暂无评论

Design of Finite-Dimensional Observer-Based Fault Diagnosis for a Class of distributed Parameter systems

引用

IFAC Proceedings Volumes 1994年第5期27卷 41-45页

作者： H. Rafaralahy M. Boutayeb M. Darouach G. Krzakala C.R.A.N.-E.A.R.A.L (C.N.R.S. UA 821) Université de Nancy I 186 rue de Lorraine 54400 Cosnes-et-Romain FRANCE

A new method for the design of finite-dimensional observer-based fault diagnosis for a class of distributed parameter systems is presented. The considered system is a set of parabolic equations with nonlinear boundary conditions which is reduced to a set of ordinary differential equations by the use of generalized orthogonal polynomials. The simultaneous state and sensors fault estimation of a class of distributed parameter systems is transformed to the state observation of finite dimensional nonlinear descriptor system without assumptions about the dynamics of fault components. The proposed observer is a finite dimensional non singular system. The exponential convergence in the original coordinates is stated and a numerical example is given to illustrate the efficiency of the method.

关键词： distributed parameters systems sensor failures nonlinear singular systems finite dimensional observers

来源：评论

学校读者我要写书评

暂无评论

Adaptive Control of Accelerated Cooling Plant Based on distributed Observer

引用

IFAC Proceedings Volumes 1993年第2期26卷 611-614页

作者： V.I. Utkin I.M. Kaliko G. Bartolini C. Ghiazza Institute of Control Sciences Profsoyuzaya 65 Moscow GSP-312 Russia University of Genova Via Opera Pia 11A-16145 Genova Italy IRITECNA S.p.A. Via di Francia I-16126 Genova Italy

Process of accelerated cooling of steel plates is under consideration. Control algorithm is developed taking into account temperature distribution wihin plate thickness and essential temperature dependence of the coefficients in the motion equation. The proposed control approach provides precise average temperature tracking in complete information case. The method is based on ordinary differential equation describing the dynamics of the scalar variable under control. For the reallife situation with entry and exit surface temperature measurements and uncertain plant parameters the developed method implies application of distributed state observer associated with adaptation loop.

关键词： distributed parameters systems accelerated cooling process infinite dimensional state observers

来源：评论

学校读者我要写书评

暂无评论

A computer model for short-term forecasting and controlling air quality in a city

引用

Annual Review in Automatic Programming 1985年第PART 2期12卷 171-174页

作者： Holnicki, Piotr Zcochowski, Antoni Systems Research Institute the Polish Academy of Sciences 01-447 WARSZAWA ul. Newelska 6 Poland

An urban-scale computer model for short-term prediction of city air quality is presented. The physical process of pollutant dispersion is described by distributed parameters advection-diffusion equation. The model, utilizing meteorological forecast, calculates spacial and temporal distribution of pollutant concentration in complex urban area. Some test computations have been conducted for Warsaw case. Basing on prediction model, a computer program for real-time control of emission redistribution in urban area is elaborated. © 1985.

关键词： Air pollution computer model distributed parameters systems optimal control

来源：评论

学校读者我要写书评

暂无评论

Software Fault-Tolerance by Design Diversity Dedix: A Tool for Experiments

引用

IFAC Proceedings Volumes 1985年第12期18卷 173-178页

作者： A. Avižienis P. Gunningberg J.P.J. Kelly R.T. Lyu L. Strigini P.J. Traverse K.S. Tso U. Voges UCLA Computer Science Department University of California Los Angles CA 90024 USA

A large number of computing systems require very high levels of reliability, availability, or safety. A fault-avoidance approach is not practical in many eases, and is costly and difficult for software, if not impossible. One way of reducing tiie effects of an error introduced during the design of a program is to use multiple versions of the program, independently designed from a common specification. If these versions are designed by independent programming teams, it is to be expected that a fault in one version will not have the same behavior as any fault in the other versions. Since the errors in the output of the versions will be different and uncorrclated, it is pos-sible to run the versions concurrently, cross-check their results at prespecified points, and mask errors. A Design Diversity experiments (DEDIX) testbed has been implemented at UCLA to study the influence of common mode errors which can result in a failure of the entire system. The layered design of DEDDC and its decision algorithm are described. The usage of the system and its application in an ongoing experiment are explained.

关键词： Computer Architecture Reliability Theory distributed parameters systems Coding Errors Fault Tolerance

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：