Perturbation Schemes
Mostrando 1-7 de 7 artigos, teses e dissertações.
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1. Controle da pressão anular de fundo durante a perfuração de poços de petróleo. 2009 / Annulus bottom-hole pressure control during oil well drilling. 2009
A non linear mathematical model (gas-liquid-solid), representing an oil well drilling system, was developed, based on mass and momentum balances, in order to implement classic control (PI), using mud pump flow rate as manipulated variable for controlling annulus bottom-hole pressure. An experimental unit was built in order to represent the control problems c
Publicado em: 2009
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2. Estudo dos efeitos perturbativos do terceiro corpo e do achatamento de um planeta na dinâmica de um veículo espacial: caso Netuno-Tritão / Study of the third body perturbation and the planet s oblatenesses in the dynamics of a spacecraft: neptune-triton case
At the present time the search for the knowledge of our solar system continues effective. So, in July 1st, 2004, the international Cassini-Huygens Mission spacecraft entered into orbit around the planet Saturn. In January, 2005, it sends data from the Huygens probe, which is on Saturn s largest moon, Titan. On January 19, 2006, occurred the launch of the New
Publicado em: 2006
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3. Controle preditivo robusto de sistemas hibridos incertos integrando restrições, logica, e dinamica baseada em series de funções ortonormais / Robust model based predictive control of uncertain hybrid systems integrating constraints, logic, and dynamics based on orthonormal series function
Model-based Predictive Control (MPC) has been attracting interest in both academic and industrial areas since the 1970 s. The MPC methodology has been recently extended to a class of hybrid systems described by dynamics and logic rules. Logical propositions are performed by using, for example, IF /THEN/ELSE operators. Due to performance requirements, the non
Publicado em: 2006
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4. ANÃLISE DE INFLUÃNCIA BASEADA NA CURVATURA NORMAL CONFORME PARA UM MODELO DE REGRESSÃO DIRICHLET
Neste trabalho apresentamos um estudo de influÃncia local no modelo de regressÃo Dirichlet proposto em Silva (2004) usando a curvatura normal conforme proposta por Poon &Poon (1999). Perturbamos o modelo segundo quatro esquemas de perturbaÃÃes diferentes, a saber: a log-verossimilhanÃa de forma multiplicativa, as variÃveis explicativas de forma aditiva
Publicado em: 2005
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5. Influencia local em modelos de calibração comparativa
In this work we consider some diagnostics aspects in a special sub-class of a general models with measurements of erros; such models are specially designed to compare measuring devices. This problem is known in the literature as Comparative Calibrations. First, we considered a study of analysis of influence in linear regression models and the method of local
Publicado em: 2000
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6. Entrainment and resonance in glycolysis
We have proposed a comprehensive model for the glycolytic reaction mechanism and have shown the possibility of self-tuning to resonance, with consequent increase in efficiency of energy transduction by separating the model into two subsystems: one for the phosphofructokinase (PFKase; ATP:D-fructose-6-phosphate 1-phosphotransferase, EC 2.7.1.11) reaction and
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7. Dynamic properties of isolated acetylcholine receptor protein: kinetics of the binding of acetylcholine and Ca ions.
Kinetic and thermodynamic constants for elementary steps associated with the interaction of acetylcholine (AcCh) and Ca with isolated AcCh receptor from Torpedo californica have been determined by chemical relaxation spectrometry. Murexide as used as a Ca indicator to monitor changes in Ca bound to the AcCh receptor. In the presence of AcCh this technique pe