Various mathematical models describing thickener behaviour have been published. These models have found limited use so far and few if any have proven dynamic capability. Under industry sponsorship, CSIRO has undertake...
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Various mathematical models describing thickener behaviour have been published. These models have found limited use so far and few if any have proven dynamic capability. Under industry sponsorship, CSIRO has undertaken to develop and validate a dynamic mathematical model describing thickner behaviour. Novel instrumentation has enabled measurement of the sediment density profile and settling rates and densities of flocculated aggregates in samples taken from the thickener. These data have been used as input to the model to establish a physical basis for appropriate parameters. This paper review the relevant literature and describes the current modelling approach and experimental methods used for validation. Typical data are presented and a comparison is made of the model output with plant data. It is anticipated that a satisfactorily validated model will be used on the plant to simulate start-up dynamics, alternative operating and control strategies and to optimize flocculant usage.
Mechanical systems, in their constant evolution, become increasingly autonomous, and their capabilities of interacting with the environment modify their structure and configuration. The paper gives an historical overv...
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Mechanical systems, in their constant evolution, become increasingly autonomous, and their capabilities of interacting with the environment modify their structure and configuration. The paper gives an historical overview on aspects related to human and mechanical dexterity, and illustrates a logical and mathematical framework for evaluating robot dexterity.< >
With regard to the problems of safety of civil engineering structures, the technology of knowledge-based systems can provide new tools to manage the problem complexity and to assist safety experts and operators. The a...
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ISBN:
(纸本)0897913728
With regard to the problems of safety of civil engineering structures, the technology of knowledge-based systems can provide new tools to manage the problem complexity and to assist safety experts and operators. The approach of the so called second-generation or deep-knowledge expert systems extends the idea of numerical modelling. It proposes the construction of software systems which implement complex models (with quantitative and qualitative attributes) and functions able to reason about the model structure and behaviour. These models and reasoning functions can support human activities like the fusion of information, diagnosis, explanation and forecasting. The aim of such systems is not to substitute the expert, but to extend the expert's ability to deal quickly and efficiently with complex problems. In this paper, a family of knowledge-based systems is presented, whose members share the same conceptual reference framework to deal with seismic risk evaluation of masonry buildings and safety assessment of concrete dams.
The experiments carried out in an earlier study show that oil contamination affects the strength and deformation characteristics of a crushed quartz sand. In the present study, a mathematical soil model is used to sim...
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The experiments carried out in an earlier study show that oil contamination affects the strength and deformation characteristics of a crushed quartz sand. In the present study, a mathematical soil model is used to simulate the mechanical behavior of the same sand. The model parameters are determined for both clean and oil contaminated soil. Simulations are made for the stress-strain behavior of the soil in drained and undrained conventional triaxial compression tests. Comparative results are presented to show the differences in the behavior of a foundation resting on a clean sand, on an oil contaminated sand, and on a sand contaminated locally.
The proceedings contain 35 papers. The special focus in this conference is on Computer Assisted Learning. The topics include: Preface;experiences using algorithm animations for teaching and research;simulating the beh...
ISBN:
(纸本)9783540526995
The proceedings contain 35 papers. The special focus in this conference is on Computer Assisted Learning. The topics include: Preface;experiences using algorithm animations for teaching and research;simulating the behaviour of three dimensional reticular structures with both curved and straight elements;an abstract machine simulator;a model of the acquisition of rule knowledge with visual helps: The operational knowledge for a functional, visual programming language;knowledge representation with and-or-graphs: Comparing the approach of doignon and falmagne with the absynt-diagnostics;computer assisted concept learning;user modelling in help systems;proactive modelling and the development of coaching strategies in Geometry;a classification and synthesis of student modelling techniques in intelligent computer-assisted instruction;maccritic: A program for practice in textual analysis and criticism;linking real-time measurement with cal;computer science for teachers: A quest for classics, and how to present them;a "tiny tool" for matrix inversion in a costoc environment;hyper information in instructional tool environments;towards a typology of educational uses of hypermedia;the direct use of already existing user manuals for computer aided instruction and information retrieval with the aid of hypermedia;the meda project: Developing evaluation competence in the training software domain;teaching software for structural engineering;computer-based flight training evaluation;interactive learning programs for unix-machines: First results of the COLOS project;dimensions of authoring aids intelligence;implementing computer-aided instruction in distance education: An infrastructure;educational software development - why. What, and how;wombat: An intelligent educational system to encourage externalisation and reflection on decision processes;human-computer graphical dialogue.
Staff in the Departments of Computer Science and Psychology at the University of York have been cooperating in interdisciplinary research since 1983. The mainstream of York's approach is to apply theory developed ...
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The paper presents the problems related to mathematicalmodelling of two-phase turbulent flows. The presented model includes charging of PVC particles being a result of collision with a pipe wall, as well as influence...
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The paper presents the problems related to mathematicalmodelling of two-phase turbulent flows. The presented model includes charging of PVC particles being a result of collision with a pipe wall, as well as influence of non-homogeneous field and external forces on aerodynamics of particles. The model served for the analysis of behaviour of dielectric particles flowing in the electric field and interactions of particular forces on the particle.
The authors have developed a 31-state nonlinear dynamic mathematical model of the human immune system in which they have been able to simulate infection with an immune deficiency retrovirus (IDV), interaction of the I...
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The authors have developed a 31-state nonlinear dynamic mathematical model of the human immune system in which they have been able to simulate infection with an immune deficiency retrovirus (IDV), interaction of the IDV-infected system with a pathogen, and treatment with certain drugs including soluble CD4 protein (sDC4), AZT, interleukin-2, and synthetic CD4-psuedomonas exotoxin (ND1). The model simulates the interactions between the principal elements of the cytotoxic and humoral arms of the immune system, i.e., a pathogen and an IDV, and is based in part on an eight-state, nonlinear dynamic model for tumor rejection described by De Boer et al. (1985) and a 19-state model of immune deficiency disease given by G. Reibnegger et al. (1987).
The behaviour of drilling and production risers is normally predicted through mathematical analysis and modelling. These methods can be of varying accuracy and give different levels of confidence in the riser performa...
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A description is given of the rationale, methods, and results of a computer study of the human and murine immune systems in which the authors have examined the interactions of the cell-mediated, antibody-independent c...
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A description is given of the rationale, methods, and results of a computer study of the human and murine immune systems in which the authors have examined the interactions of the cell-mediated, antibody-independent cytotoxic response to cancer. The purpose of this study of the immunological control system is to gain an understanding of how this complex, nonlinear system can be manipulated to destroy cancerous cells through the use of control substances in the proper amounts and at critical times. The mathematical model is based on mass-action kinetics and includes the effect of receptor saturation;it uses 12 states (or compartments) to describe the dynamic behavior of the tumor cells, various immune system cells, and certain control substances.
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