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Sorption of radioactive strontium on a silica-titania mixed hydrous oxide gel

JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY 1997年第1期220卷 55-58页

作者： Venkatesan, KA Sasidharan, NS Wattal, PK Process Engineering and Systems Development Division Bhabha Atomic Research Centre Mumbai India

A silica-titania (Si-Ti) mixed hydroxide gel with Ti to Si mole ratio of 1 : 1 was prepared Studies on the sorption of radiostrontium from alkaline solutions having various concentrations of sodium were carried out with Si-Ti. The distribution coefficient (K-d) of strontium decreased with increasing concentrations of sodium from 0.1 to 4.0 ***(-3). The plot of log K-d versus log [Na+] gave a slope of -0.55 as against the theoretical value of -2.0. This suggests that some other paths in addition to the simple stoichiometric ion exchange is also existing for sorption. From pH titrations the pH(pzc) of Si-Ti was found to be 4.22 coinciding nearly with the pH sorption edge. An attempt was made to correlate the sorption results with the surface characteristics of the sort,ent. It was found that sorption is favored when the surface of the sorbent transforms into an anionic form. Sharp increase in the sorption of strontium was observed when the equilibrium pH was between 7 and 10. This behavior could be attributed to the abrupt increase in net negative charge on the surface of the sorbent.

关键词： Sorption

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STEADY-STATE OPERATION ANALYSIS OF AN IDEAL HEAT INTEGRATED DISTILLATION COLUMN

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Chinese Journal of Chemical engineering 1997年第4期5卷 43-54页

作者：黄克谨钱积新战德志中岩勝高松武一郎 Institute of Industrial Process Control Zhejiang University Department of Chemical Process Automation Qingdao Institute of Chemical Engineering Department of Chemical Systems National Institute of Materials and Chemical Research Institute of Industrial Technology Kansai University

A systematic approach for the steady-state operation analysis of chemical processes is *** method affords the possibility of taking operation resilience into consideration during thestage of process *** may serve the designer as an efficient means for the initial screening ofalternative design *** ideal heat integrated distillation column(HIDiC),without any reboileror condenser attached,is studied throughout this *** has been found that among the various va-riables concerned with the ideal HIDiC,feed thermal condition appears to be the only factor exertingsignificant influences on the interaction between the top and the bottom control *** is expected when the feed thermal condition approaches *** number of stages andheat transfer rate are essential to the system ability of disturbance ***,more stagesand higher heat transfer rate ought to be ***,too many stages and higher heat transfer ratemay increase the load of the

关键词： Distillation model identification steady-state design operation resilience process control

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Simultaneous production of electricity, steam, and CO2 from small gas-fired cogeneration plants for enhanced oil recovery

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ENERGY CONVERSION AND MANAGEMENT 1997年第Sup期38卷 S223-S228页

作者： deMontigny, D Kritpiphat, W Gelowitz, D Tontiwachwuthikul, P [#]Process Systems Laboratory Industrial Systems Engineering Division Faculty of Engineering/Energy Research Unit The University of Regina Regina Saskatchewan S4S 0A2 Canada Tel. (306) 585-4726 Fax. (306) 585-4855

In recent years, global warming has been blamed on the so called ''greenhouse effect'' and has caught the attention of scientists and politicians throughout the world. There is an increasing concern surrounding the emission levels of greenhouse gases, particularly carbon dioxide (CO2). This paper is an extension of earlier work((1)) to show how cogeneration concepts can be used to reduce production costs by simultaneously producing electricity, CO2 and steam for enhanced oil recovery (EOR) applications. (C) 1997 Elsevier Science Ltd.

关键词： carbon dioxide recovery cogeneration enhanced oil recovery greenhouse effect

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Knowledge extraction from artificial neural network models

Knowledge extraction from artificial neural network models

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IEEE International Conference on systems, Man and Cybernetics

作者： Z. Boger H. Guterman Intelligent Process Control Systems Beersheba Israel Department of Electrical and Computer Engineering Ben-Gurion University of the Negev Beersheba Israel

The paper describes the development and application of several techniques for knowledge extraction from trained ANN models, such as the identification of redundant inputs and hidden neurons, derivation of causal relationships between inputs and outputs, and analysis of the hidden neuron behavior in classification ANNs. An example of the application of these techniques is given of the faulty LED display benchmark. References of the application of these techniques are given of diverse large scale ANN models of industrial processes.

关键词： Artificial neural networks Neurons Large-scale systems Power system modeling Industrial training Predictive models Data mining Electronic mail Industrial relations Industrial plants

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Nonlinear predictive control based on the extraction of step-response models from Takagi-Sugeno fuzzy systems

Nonlinear predictive control based on the extraction of step...

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American control Conference (ACC)

作者： M. Fischer M. Schmidt K.K. Kavsek-Biasizzo Institute of Automatic Control Laboratory of Control Systems and Process Automation Technical University of Darmstadt Darmstadt Germany Faculty of Electrical Engineering University of Ljubljana Ljubljana Slovenia

This paper deals with nonlinear predictive control based on higher order Takagi-Sugeno fuzzy systems which can also be interpreted as generalized radial basis function networks. We investigate how the fuzzy models can be linked to a special type of model based predictive control algorithm, namely the dynamic matrix control (DMC). Previously, purely linear step response models were used for long-range prediction. Here, the method is extended to nonlinear processes. Therefore, various step responses for different operating points are extracted from the fuzzy model. For performance evaluation, a heat exchanger is identified by means of the local linear model tree algorithm and controlled by the modified DMC.

关键词： Predictive control Predictive models Takagi-Sugeno model Fuzzy systems Automatic control Laboratories Radial basis function networks Fuzzy control control system synthesis Nonlinear control systems

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Stability constrained model predictive control for nonlinear systems

Stability constrained model predictive control for nonlinear...

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IEEE Conference on Decision and control

作者： Xu Cheng B.H. Krogh Process Control Division Westinghouse Electric Corporation Pittsburgh PA USA Department of Electrical and Computer Engineering Carnegie Mellon University Pittsburgh PA USA

ISBN: (纸本)0780341872

A new method for nonlinear model predictive control with guaranteed stability is proposed as an extension to the stability constrained model predictive control (SCMPC) for linear time-invariant systems. The method applies to a class of nonlinear systems that can be transformed to a controllable companion form and depends on the existence of a nonlinear deadbeat control (although this is not necessarily the control that is used). Asymptotic stability is proved for the case when all state variables are measurable.

关键词： Predictive models Predictive control Nonlinear systems control systems Asymptotic stability Nonlinear control systems process control Chemical industry Electrical equipment industry Industrial control

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Stability-constrained model predictive control with state estimation

Stability-constrained model predictive control with state es...

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American control Conference (ACC)

作者： Xu Cheng B.H. Krogh Process Control Division-Strategic Engr. Westinghouse Electric Corporation Pittsburgh PA USA Department of Electrical and Computer Engineering Carnegie Mellon University Pittsburgh PA USA

This article presents an extension to stability-constrained model predictive control (SCMPC) incorporating state estimation. It is proved that asymptotic stability of the closed loop system is guaranteed for SCMPC when a stable state estimator is used rather than direct measurement of the full state variables. The results are illustrated with experimental results from a real-time implementation of SCMPC with state estimation for control of a plasma enhanced chemical vapor deposition (PECVD) system.

关键词： Predictive models Predictive control State estimation Plasma measurements Asymptotic stability Closed loop systems Real time systems control systems Plasma chemistry Plasma stability

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On the Two Practical Issues in System Identification with Wavelets

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IFAC Proceedings Volumes 1997年第11期30卷 41-46页

作者： A.A. Safavi J.A. Romagnoli Dept of Control Eng. Faculty of Electronic Industry Shiraz University Shiraz. I.R. of Iran ICI Process Systems Engineering Laboratory. Department of Chem. Eng. The University of Sydney NSW 2006 Australia

Two practical problems in performing wavelet based system identification are addressed in this paper, which are the irregularity of the sampling interval of the data and unavailability of sufficient number of data poi... 详细信息

关键词： Wavelets System Identification Multiresolution Analysis Irregular Sampling

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Robust Classification of "Artificial Nose" Sensor Data by Artificial Neural Networks

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IFAC Proceedings Volumes 1997年第9期30卷 347-351页

作者： Z. Boger L. Ratton T.A. Kunt T.J. Mc Avoy R.E. Cavicchi S. Semancik Consultant Intelligent Process Control Systems PO Box 15053 Be’er-Sheva 84003 Israel Institute for System Research Department of Chemical Engineering University of Maryland College Park MD 20742 Chemical Science and Technology Laboratory National Institute of Standards and Technology Gaithersburg MD 20899

Response data from a novel micro-hotplate gas sensor were used to test a robust classification technique based on an artificial neural network. Four different compounds were identified even when the sensor signal was corrupted by high levels of noise and drift. Additional verification rules in doubtful cases were provided by examining unique binary patterns of outputs of the hidden layer neurons. Similarities to proposed models of the human nose are noted.

关键词： Micro-hotplate gas sensors Artificial neural networks Classification rules Artificial nose

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Building ships as a system: An approach to total ship integration

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NAVAL ENGINEERS JOURNAL 1997年第5期109卷 47-60页

作者： Duren, BG Pollard, JR Bernard G. Duren:is an operations research analyst in the Combat Systems Department of the. Naval Surface Warfare Center Dahlgren Division. Mr. Duren received an A.B. degree in mathematics from Indiana University and an M.S. degree in operations research from the Georgia Institute of Technology. His major duties involve development of system concepts and system engineering methodology. His primary areas of achievement include startup of a strategic planning process at the Dahlgren Division analysis of seaskimmer defense issues and formulation of concepts for counter-command warfare. His areas of interest include information integration group problem solving methods warfare analysis and strategic planning. Mr. Duren is currently conducting studies in design of future shipboard combat systems. James R. Pollard:serves as principal systems engineer in the Combat Systems Department of the Naval Surface Warfare Center Dahlgren Division. Dr. Pollard received a B.S. degree in physics from Roanoke College an M.S. degree in electrical engineering from The George Washington University and a Ph.D. in systems engineering from the University of Virginia. After joining the Dahlgren Division in 1962 he performed research in antennas and electromagnetic coupling. He subsequently managed the Special Effects Weapon Research Program which focused on high power electromagnetic devices. After serving as head of the Weapon Systems Division and the Search and Track Division he formed the Strategic Planning Group. In 1985 he received the Bernard Smith Award for creative development and implementation of a strategic planning process for the Division. From 1985 to 1987 he served as warfare systems architect in the Space and Naval Warfare Systems Command. Dr. Pollard is currently conducting studies in design of future shipboard combat systems.

This paper considers an effort to reinvent the process by which the Navy transforms operational requirements into warships. The objective is to articulate a framework and strategy for implementing a total ship system engineering approach. Three factors drive the effort: involve the warfighters in the design process;adopt a ''system of systems'' framework for integration;and continually improve the acquisition process. The strategy is illustrated by consideration of control structure on a total ship basis. The work has been conducted as a collaborative effort involving three Navy warfare centers and various headquarters activities in Washington, D.C.

关键词： Shipbuilding

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