Nonideal Systems
Mostrando 1-12 de 20 artigos, teses e dissertações.
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1. Dynamic analysis of a cantilever beam excited by a non ideal source / Análise dinâmica de uma viga engastada excitada por uma fonte não ideal
Studies about the dynamic behaviour of nonlinear structures have been to this date subject of extensive research all around the world. Since the beginning of the development of the nonlinear oscillation theory one has tried to understand the basic mechanisms, like disruptions that would cause complex answers on flexible structures. This paper presents a theo
Publicado em: 2009
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2. Uma investigação sobre a aplicabilidade da teoria de sistemas não-ideais a fundações de máquinas reais. / An investigation on the applicability of the non-ideal systems theory to real machine foundations.
The main objective of the present project is to verify the interaction between the foundation structure of a machine - an industrial fan - with the excitation source, its own motor, in this case to identify possible occurrence of the so called "jump phenomenon", also known as Sommerfeld Effect. Such phenomenon is derived from the dynamic coupling between the
Publicado em: 2008
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3. O efeito Casimir dinâmico e decoerência
In this thesis we first demonstrate that the inevitable action of the environment can be substantially weakened when considering appropriate nonstationary quantum systems. Beyond protecting quantum states against decoherence, an oscillating frequency can be engineered to make the system-reservoir coupling almost negligible. Differently from the program for e
Publicado em: 2008
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4. Predição do equilibrio liquido-vapor atraves de redes neurais artificiais / Prediction of vapor-liquid equilibrium using artificial neural networks
: Esse trabalho tem como objetivo o estudo da viabilidade de se utilizar se redes neurais artificiais (RNAs) para a predição de equilíbrio líquido-vapor (EL V), utilizando a abordagem do método de contribuição de grupos, método UNIF AC. Foram feitas duas propostas de trabalho, uma substituindo o método UNIF AC para o cálculo do coeficiente de ativi
Publicado em: 2008
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5. Separation of binary mixtures by pervaporation and reverse osmosis / Separação de misturas binarias por pervaporação e osmose inversa
In this work, the modelling and simulation of pervaporation and reverse osmosis processes for binary mixtures were carried out. The development of prediction methodologies for process variables of pervaporation and reverse osmosis without the necessity of experimental data was the general guideline followed; the experimental data used in these methodologies
Publicado em: 2007
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6. Recent advances in multi-body dynamics and nonlinear control
This paper presents some recent advances in the dynamics and control of constrained multi-body systems. The constraints considered need not satisfy D'Alembert's principle and therefore the results are of general applicability. They show that in the presence of constraints, the constraint force acting on the multi-body system can always be viewed as made up o
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2006-09
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7. Nonlinear dynamics of nonideal rotor / Dinamica não-linear de um rotor não-ideal
Esse trabalho investiga um sistema dinâmico não- ideal que pertence a uma classe especial dos sistemas dinâmicos. O objeto de estudo desse trabalho é um rotor que consiste de um disco preso a uma barra elástica e excitado por uma fonte de energia de potência limitada. O sistema se desloca transversalmente e verticalmente além de possuir uma coordenada
Publicado em: 2006
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8. Kinetics of helminth eggs inactivation in water and digested sludges by saturated steam produced with methane from anaerobic digestors. / Inativação térmica de ovos de helmintos em água e em biossólidos digeridos: cinética em reator batelada e modelagem matemática em reator tubular.
Biological sludge can be a valuable resource for agricultural soil conditioning. However, an important obstacle for its use is the usual presence of pathogenic organisms, capable of disease dissemination. The main occurring pathogens are virus, bacteria, protozoa and helminth. Helminth eggs are very resistant to thermal inactivation. The Ascaris lumbricoids
Publicado em: 2006
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9. Analise não linear de sistemas dinamicos holonomos não ideais / Nonlinear anaIysis of non ideals holonomic dynamical systems
Several times the mechanical systems join the behavior described by laws of motion to the dynamic of their operation. Their solution pass by adopted simplified hypotheses in order to obtain a representative and helpful mathematical model. When the energy source used in the bringing to the action of the motion has limited power, i.e., there is not sufficient
Publicado em: 2002
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10. Desenvolvimento de um programa para geração de mapas de curvas residuais e aplicação a processos de destilação azeotropica e extrativa
Despite the development of new separation processes, the predominant unit operation used in chemical industries is, still, distillation, especially for large-scale separation of non-ideal mixtures. Many papers have dedicated special attention to the study of azeotropic mixtures, looking for the development of design and synthesis tools. Residue curve maps pl
Publicado em: 2002
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11. Aspectos dinamicos de sistemas quanticos abertos
Dynamical aspects of three open quantum systems are examined. In the problem of quantum particle trapping by oscillating fields there is the evidence of movement stabilization and the quadrature-squeezing degradation for the quantum particle, due to the dissipative action of the environment over the particle. In the problem of information transfer occuring i
Publicado em: 1999
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12. Precipitação de parafina em misturas de petroleo : medidas experimentais e modelagem termodinamica
The appearance and development of a solid-phase in the liquid solution of a petroleum fluid can occur when it is subjected to low temperatures. The solid phase - formed by high molecular wheight components - may cause serious operational problems that can even lead to an interruption of the mixture production. Hence, it is important to predict the way it hap
Publicado em: 1994