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Techn. Universiẗat, Diss., 2001--Braunschweig.

O presente trabalho tem por objetivo estudar e aplicar um método de integração numérica de tempo para estrutras dinâmicas com dissipação de energia. Nessa dissertação tal método é analisado e posteriormente implementado em MATLAB, afim de resolver algumas aplicações em sistemas dinâmicos dotados de massas, molas e amortecedores que são apresentados no primeiro capítulo. Usando o método implementado em MATLAB, também é apresentada uma aplicação para vibrações transversais em cordas axialmente.

O presente trabalho tem por objetivo estudar e aplicar um método de integração numérica de tempo para estrutras dinâmicas com dissipação de energia. Nessa dissertação tal método é analisado e posteriormente implementado em MATLAB, afim de resolver algumas aplicações em sistemas dinâmicos dotados de massas, molas e amortecedores que são apresentados no primeiro capítulo. Usando o método implementado em MATLAB, também é apresentada uma aplicação para vibrações transversais em cordas axialmente.

Thesis (Masters Degree(Chemical Engineering))--Cape Peninsula University of Technology, 2008 / ABSTRACT Carbon-in-pulp (CIP) technology is firmly entrenched in the mining sector due to numerous advances in the last few decades. CIP technology recovers complexed gold in solution from slurry streams by contacting the pulp with carbon and separating the two by screening. The carbon-in-leach (CIL) process, where the pulp contains free cyanide, is closely related to CIP. Both these processes, especially CIL, are complex and are governed by a number of interacting unit processes. The overall process efficiency is dependant on a large number of variables, making the process difficult to optimize. This study uses simple adsorption and leaching rate equations in order to predict dynamic CIL/CIP plant performance under varying operating conditions. This will assist plant metallurgists to achieve optimum efficiency, highlight plant sensitivity to certain variables and will ultimately result in proactive process control. Various assumptions were made in order to keep the modeling considerations as simple and realistic as possible. The process was assumed to have linear kinetic and equilibrium operation. The process was simulated using Simulink in Matlab. Variables are solved on a time step basis by Matlab’s built in optimization algorithms. Simulation results illustrated that the use of simple leaching and adsorption rate expressions are effective for investigating dynamic plant behavior under changing operating conditions.

Submitted by Rafael Santana (rafael.silvasantana@ufpe.br) on 2017-05-11T17:59:30Z No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) dissertação - versão final.pdf: 2247413 bytes, checksum: 866e7cc003d956cc17501a1a3d33a800 (MD5) / Made available in DSpace on 2017-05-11T17:59:30Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) dissertação - versão final.pdf: 2247413 bytes, checksum: 866e7cc003d956cc17501a1a3d33a800 (MD5) Previous issue date: 2016-04-19 / CNEN / Os estudos atuais sobre o comportamento termofluidodinâmico do núcleo dos reatores VHTGR da 4ª geração são comumente desenvolvidos em análises 3-D em CFD (fluidodinâmica computacional) o que muitas vezes requer bastante tempo e complexos cálculos matemáticos para a realização destas análises. A proposta deste projeto é realizar a análise termofluidodinâmica do escoamento do gás refrigerante hélio num canal típico de reator VHTGR de núcleo prismático avaliando grandezas de interesse como temperatura, pressão e velocidade do fluido e a distribuição de temperaturas na parede do canal refrigerante, a partir do desenvolvimento de um código computacional em MATLAB considerando o escoamento no canal unidimensional, reduzindo assim significativamente o tempo de processamento dos cálculos. O modelo desenvolvido utiliza três diferentes referências para as propriedades físicas do hélio: expressões dadas pelo KTA (Comissão Alemã de Normas de Segurança Nuclear), a ferramenta computacional REFPROP e um conjunto de valores constantes para todo o canal. Com a utilização destas três referências é possível simular o escoamento tratando o gás tanto compressível como incompressível. Os resultados obtidos apresentaram valores para as grandezas de interesse bastante próximos e revelaram que não há diferenças significativas na utilização das diferentes referências utilizadas no projeto, uma outra conclusão importante a ser observada é a não dependência no comportamento termofluidodinâmico do hélio dos efeitos de compressibilidade do gás. O estudo também indicou que o gás não sofre efeitos severos devido à elevada variação de temperatura no canal, uma vez que este entra a 914 K e sai a aproximadamente 1263 K, o que afirma a excelente utilização do hélio como fluido refrigerante em canais de reatores VHTGR. A comparação dos resultados obtidos neste trabalho com outro existente na literatura serviu para confirmar a efetividade do método de consideração unidimensional do escoamento do gás no canal refrigerante em substituição à modelos realizados em 3-D, para a faixa de pressão e temperatura usadas no projeto, uma vez que os resultados obtidos foram praticamente os mesmos nas condições iguais de operação. / The current studies about the thermalfluiddynamic behavior of the VHTGR core reactors of 4th generation are commonly developed in 3-D analysis in CFD (computational fluid dynamics), which often requires considerable time and complex mathematical calculations for carrying out these analysis. The purpose of this project is to achieve thermalfluiddynamic analysis of flow of gas helium refrigerant in a typical channel of VHTGR prismatic core reactor evaluating magnitudes of interest such as temperature, pressure and fluid velocity and temperature distribution in the wall of the coolant channel from the development of a computer code in MATLAB considering the flow on onedimensional channel, thereby significantly reducing the processing time of calculations. The model uses three different references to the physical properties of helium: expressions given by the KTA (German committee of nuclear safety standards), the computational tool REFPROP and a set of constant values for the entire channel. With the use of these three references it is possible to simulate the flow treating the gas both compressible and incompressible. The results showed very close values for the interest quantities and revealed that there are no significant differences in the use of different references used in the project. Another important conclusion to be observed is the independency of helium in the gas compressibility effects on thermalfluiddynamic behavior. The study also indicated that the gas undergoes no severe effects due to high temperature variations in the channel, since this goes in the channel at 914 K and exits at approximately 1263 K, which shows the excellent use of helium as a refrigerant fluid in reactor channels VHTGR. The comparison of results obtained in this work with others in the literature served to confirm the effectiveness of the onedimensional consideration of method of gas flow in the coolant channel to replace the models made in 3-D for the pressure range and temperature used in the project since the results obtained were almost the same in the same operating conditions.

SELINGER, M. MathScript in LabVIEW. Brno: Brno University of Technology, The Faculty of Electrical Engineering and Communication, 2008. 92 pages. Supervisor Ing. Miloslav Äejka, CSc. The main goal of this Thesis is to examine the portability of the m-scripts between The National Instruments LabVIEW MathScript and The MathWorks MATLAB development programs. The Thesis deals with function differences execution speeds and giving overview of using The National Instruments LabVIEW MathScript programme.

A Dissertation submitted to the Department of Mathematics, Science and Technology Education In fulfilment of the requirement for the Degree of Master of Education (Mathematics Education) in the Faculty of Education at the University of Zululand, 2019. / Studies from interdisciplinary have noted positive correlation between spatial-visualization skills and mathematical problem solving. However, majority of these studies that interrogated this shared link between spatial-visualization and problem solving were carried in the urban settings only few interrogated rural settings. Also, studies have identified family social economic status (SES) which mainly described one’s geographical settlement to be one of the major effects on cognitive development. Thus, research finding from cognitive discipline revealed that students from poor SES background are less advantagous to cognitive activities (e.g., problem solving) compare to their counterpart. However, one of research achievements is providing evidence-based that cognitive skills can be enhanced through computer technology and spatial activities hence, the integration of several graphical tools such as: MATLAB, GeoGebra, and many other computer environments in mathematics education. These graphical tools are believed to enhance students’ conceptual and procedural knowledge in problem solving in mathematics areas such as: Euclidean geometry, multivariate calculus, and trigonometry which require more spatial skills in their problem solving. However, little has been researched on vector calculus even though vector calculus by its definition is accompanied by spatial reasoning. Students find it easy to evaluate a given vector integral using analytical techniques for integrations but struggle to visualize and transform it from one coordinate system to another. Objectives Based on the background, the current research employed the theoretical frameworks of Duval semiotic representation and the visual-analyser (VA) proposed by Zazkis et al., to analyse MATLAB instruction on rural-based pre-service teachers' spatial-visualisation skills and problem solving in vector calculus. The examination was guided by the analysis of the dynamic software MATLAB instruction on Spatial-Visualization, problem solving, and achievement in Vector Calculus. The three objectives were to 1) Analyse how rural-based v pre-service teachers apply their spatial-visualisation skills in problem solving in vector calculus. 2) To investigate the degree to which rural-based pre-service teachers’ spatial-visualisation skills correlate with their vector calculus achievement and 3) To assess how a dynamic software environment such as MATLAB influences rural-based pre-service teachers’ spatial-visualisation skills.

No description available.

Control Allocation addresses the problem of the management of multiple, redundant control effectors. Generally speaking, control allocation is any method that is used to determine how the controls of a system should be positioned to achieve some desired effect. An infinite number of allocation methods exist, from the straight-forward direct allocation technique, to the daisy chaining approach, to the computationally simple generalized inverse method. Because different methods have advantages and disadvantages with respect to others, the determination of the "optimal" control allocation method is left to the system designer. The many tradeoffs that are addressed during control system design, of which control allocation is an integral part, dictate the need for a reliable, computer-based design tool. The Control Allocation Toolbox for MATLAB satisfies such a need by providing the designer with a means of testing/comparing the validity of certain allocation methods under prescribed conditions. The issues involved in the development and implementation of the Control Allocation Toolbox are discussed. / Master of Science