检索结果-内蒙古大学图书馆

ABB Review 2005年第2期 44-48页

作者： Horch, Alexander Hegre, Vidar Hilmen, Katrine Melbø, Hallgeir Benabbas, Lamia Pistikopoulos, Stratos Thornhill, Nina Bonavita, Nunzio ABB Corporate Research Germany ABB Corporate Research Norway Imperial College UCL Centre for Process Systems Engineering United Kingdom ABB Advanced Control Solutions Italy

An international team from ABB and the Imperial College London/University College London's Centre for process systems engineering has initiated a project to reduce the time spent on troubleshooting in processing plants. The project aims at automatically detecting plant-wide disturbances and determining the root causes of disturbances and oscillations in production processes. Researchers at the University have developed methods for computer-aided plant disturbance analysis. The main aim of the researchers is to develop a software application that identifies unwanted plant behavior and its root causes so that operational and maintenance efforts are directed efficiently.

关键词： Computer aided analysis

来源：评论

学校读者我要写书评

暂无评论

Differential evolution and its application to metabolic flux analysis

Differential evolution and its application to metabolic flux...

引用

EvoWorkshops 2005: EvoBIO, EvoCOMNET, EvoHOT, EvoIASP, EvoMUSART, and EvoSTOC

作者： Yang, Jing Wongsa, Sarawan Kadirkamanathan, Visakan Billings, Stephen A. Wright, Phillip C. Department of Automatic Control and Systems Engineering University of Sheffield Sheffield United Kingdom Department of Chemical and Process Engineering University of Sheffield Sheffield United Kingdom

Metabolic flux analysis with measurement data from 13C tracer experiments has been an important approach for exploring metabolic networks. Though various methods were developed for 13C positional enrichment or isotopomer modelling, few researchers have investigated flux estimation problem in detail. In this paper, flux estimation is formulated as a global optimization problem by carbon enrichment balances. Differential evolution, which is a simple and robust evolutionary algorithm, is applied to flux estimation. The algorithm performances are illustrated and compared with ordinary least squares estimation through simulation of the cyclic pentose phosphate metabolic network in a noisy environment. It is shown that differential evolution is an efficient approach for flux quantification. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Metabolism

来源：评论

学校读者我要写书评

暂无评论

Edge flaking - Similarity between quasistatic indentation and impact mechanisms for brittle materials

Edge flaking - Similarity between quasistatic indentation an...

引用

作者： Morrell, Roger Division of Engineering and Process Control National Physical Laboratory Teddington Middlesex TW11 0LW United Kingdom

The process of edge flaking of brittle materials is a significant limitation in design, handling and use of components. Simple quasistatic tests to identify resistance to edge flaking can be based on near-edge indentation and scratching towards an edge, and these produce rankings of materials that broadly correlate with GIc or KIc. However, most edge damage occurs in practice by impact. Using a drop-weight impact tester, edge chipping tests have been performed dynamically on a range of brittle materials, using repeated impact with step-wise height increments until fracture. It has been found that when impact energy rather indentation force is used as the correlative parameter against distance of the impact site from the edge of the test-piece, a similar relationship to that of quasistatic indentation is found. The shapes of edge flakes produced may also similar. This suggests that even when a relatively blunt impactor is used, compared with conventional indenters, the mechanics of the failure are similar. However, the occurrence of ring cracks can lead to unusual flake shapes. It follows that simpler-to-perform quasistatic tests can model the less well-defined dynamic impact situation in terms of testing for the effects of geometry or for comparing performance of different material types. © UK Crown copyright, 2004.

关键词： Materials science

来源：评论

学校读者我要写书评

暂无评论

Assessment of the steam oxidation behaviour of high temperature plant materials

Assessment of the steam oxidation behaviour of high temperat...

引用

4th International Conference on Advances in Materials Technology for Fossil Power Plants

作者： Osgerby, S. Fry, A. Division of Engineering and Process Control National Physical Laboratory Teddington Middlesex TW11 0LW United Kingdom

ISBN: (纸本)0871708183

The growth kinetics and spallation behaviour of oxide scales grown under steam environments have been investigated for alloys that are used in high temperature plant. The influence of alloy composition has been analysed using two approaches - an empirical model based upon a concept of 'chromium equivalent' and a neural network model. Both models provide good correlation with experimental results where there are sufficient data to generate the model parameters. There is insufficient data on scale spallation for the development of similar models describing the influence of alloy composition.

关键词： Steam

来源：评论

学校读者我要写书评

暂无评论

Reconstruction of continuous surface profiles from discretely sampled data 5

Reconstruction of continuous surface profiles from discretel...

引用

5th International Conference of the European Society for Precision engineering and Nanotechnology, EUSPEN 2005

作者： Brennan, J.K. Crampton, A. Jiang, X. Leach, R. Harris, P. School of Computing and Engineering University of Huddersfield United Kingdom Division of Engineering and Process Control National Physical Laboratory United Kingdom Mathematics and Scientific Software Group National Physical Laboratory United Kingdom

The need to produce a continuous representation of a curve (or part of a curve) from a set of discretely defined data arises in many metrological applications. In this paper we are interested in the reconstruction of continuous surface texture profiles defined only at discretely obtained points. By reconstructing surface profiles accurately, with elements of numerical safety being taken into account, we can provide a mathematically sound basis on which to compute surface texture profile parameters [1], especially those that do not allow exact evaluation with discrete data points. Examples are given to illustrate the advantages of using this reconstruction method.

关键词： Surface reconstruction

来源：评论

学校读者我要写书评

暂无评论

Application of genealogical decision trees for open-loop tracking control

Application of genealogical decision trees for open-loop tra...

引用

作者： Ikonen, Enso Najim, Kaddour Moral, Pierre Del Systems Engineering Laboratory Department of Process and Environmental Engineering University of Oulu P.O.Box 4300 FIN-90014 Oulu Finland Process Control Laboratory E.N.S.I.A.C.E.T. 118 route de Narbonne 31077 Toulouse cedex 4 France Laboratoire de Statistiques et Probabilites Toulouse France

ISBN: (纸本)008045108X

A new approach based on a genealogical decision tree is suggested for solving an open-loop tracking problem. The algorithm associates Gaussian distributions to both the norms of the control actions and the tracking errors. It solves the optimization problem sequentially, using random resampling from a population of solutions. This stochastic search model can be interpreted as a simple genetic particle evolution model with a natural birth and death interpretation. It converges in probability. Two numerical examples, dealing with rapid thermal processing and robotics, illustrate the feasibility and the performance of this control algorithm Copyright © 2005 IFAC.

关键词： Decision trees

来源：评论

学校读者我要写书评

暂无评论

Analysis of different crystalliser configurations to perform preferential crystallisation

Analysis of different crystalliser configurations to perform...

引用

作者： Elsner, M.P. Muslera, E. Alonso Angelov, I. Fernaśndez Menéndez, D. Lorenz, H. Polenske, D. Vollmer, U. Raisch, J. Seidel-Morgenstern, A. Max Planck Institute for Dynamics of Complex Technical Systems Physical and Chemical Foundations of Process Engineering Sandtorstr. 1 39106 Magdeburg Germany Max Planck Institute for Dynamics of Complex Technical Systems Systems and Control Theory Group Sandtorstr. 1 39106 Magdeburg Germany Otto von Guericke University Department of Chemical Engineering Universitätsplatz 2 39106 Magdeburg Germany Otto von Guericke University Department of System Theory of Process Engineering PO Box 4120 39106 Magdeburg Germany

The intention of this paper is the analysis of general concepts for preferential crystallisation with the focus on aspects of quantification. In this preliminary examination, the amino acid threonine was used as a model system. The use of on-line polarimetry in combination with on-line densimetry as well as microscopic investigation enables to obtain some indispensable information about the crystallisation kinetics. Taking these estimated values into consideration a simplified mathematical description as a first approach including a population balance model was established for the simulation of the time changes of liquid phase composition during the preferential crystallisation process. Based on this simplified model different crystalliser configurations were investtigated.

关键词： Crystallization

来源：评论

学校读者我要写书评

暂无评论

Interactions between carbon nanotubes and liquids: Imbibition and wetting

Interactions between carbon nanotubes and liquids: Imbibitio...

引用

2005 NSTI Nanotechnology Conference and Trade Show - NSTI Nanotech 2005

作者： Cuenat, A. Whitby, M. Cain, M. Mendels, D. Quirke, N. National Physical Laboratory Division of Engineering and Process Control Hampton Road Teddington TW11 0LW United Kingdom Department of Chemistry Imperial College London SW7 2AY United Kingdom

ISBN: (纸本)0976798514

We report on our progress to extend the current experimental measurements of interactions between fluid and materials to times and length scales characteristic of nanomaterials. The rapid imbibition of decane and nonpolar fluids by carbon nanotubes is investigated to confirm recent theoretical results obtained using MD simulations. The wetting dynamics of carbon nanotubes and larger carbon fibres (∼200 nm) are studied as a function of the liquid. We outline the main experimental challenges both in terms of time resolution and force sensitivity necessary for reliable experiments at these scales and present the first result of in-situ TEM observations of wetting of carbon nanotubes.

关键词： Carbon nanotubes

来源：评论

学校读者我要写书评

暂无评论

GRANULAR COMPUTING AND EVOLUTIONARY FUZZY MODELLING FOR MECHANICAL PROPERTIES OF ALLOY STEELS

引用

IFAC Proceedings Volumes 2005年第1期38卷 205-210页

作者： G. Panoutsos M. Mahfouf Institute for Microstructural and Mechanical Process Engineering: The University of Sheffield (IMMPETUS) Department of Automatic Control and Systems Engineering Mappin St. Sheffield S1 3JD UK

In this paper the development of a model for Mamdani type fuzzy rule-based systems using the new concept of granular computing (GrC) is presented. In this study a GrC algorithm is used to capture the required information in the form of data granules within a high dimensional complex database. The initial collection of information granules is used as a rule-base for a fuzzy inference system (FIS) which is optimised by utilising an Adaptive Genetic Algorithm (AGA). The proposed methodology is applied to real data relating to the heat treatment of alloy steels.

关键词： Fuzzy systems model approximation data reduction knowledge acquisition genetic algorithms machine learning

来源：评论

学校读者我要写书评

暂无评论

Global Optimization for Integrated Design and control of Computationally Expensive process Models

Global Optimization for Integrated Design and Control of Com...

引用

IEEE Conference on Decision and control

作者： J.A. Egea D. Vries A.A. Alonso J.R. Banga Process Engineering Group Instituto de Investigaciones Marinas (CSIC) Vigo Spain Systems and Control Group Wageningen University Wageningen Netherlands

The problem of integrated design and control optimization of process plants is discussed in this paper. We consider it as a nonlinear programming problem subject to differential-algebraic constraints. This class of problems is frequently (i) non-convex and (ii) "costly" (i.e. computationally expensive to evaluate). Thus, on the one hand, local optimization techniques usually fail to locate the global solution and, on the second hand, most global optimization methods require many simulations of the model, resulting in unaffordable computation times. As an alternative, one may consider global optimization methods which employ surrogate-based approaches to reduce computation times, and which require no knowledge of the problem structure. A challenging Wastewater Treatment Plant benchmark model (see [1] and references therein) is used to evaluate the performance of these techniques. Numerical experiments with different optimization solvers indicate that the proposed benchmark optimization problem is indeed non-convex, and that we can achieve an improvement of the controller performance compared to the best tuned controller settings available in the literature. Moreover, these results show that surrogate-based methods may indeed reduce computation times while, at the same time ensuring convergence to the best known solutions.

关键词： Design optimization Computational modeling Optimization methods process control Wastewater treatment Stochastic processes Chemical processes control systems systems engineering and theory Performance evaluation

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：