Non Linear System
Mostrando 1-12 de 361 artigos, teses e dissertações.
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1. INTRODUÇÃO ÀS REDES NEURAIS PARA REGRESSÕES NÃO-LINEARES: AJUSTE DE SUPERFÍCIES DE ENERGIA POTENCIAL
The present work demonstrates how neural networks are used to do non-linear regressions. The technique is presented in a simple and didactic manner and applied to fit potential energy surfaces for the FeC molecule and for the reaction H + H2. It shows how to do the fitting for single- and multi-variable system providing examples and code that can be easily e
Quím. Nova. Publicado em: 2021-02
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2. Analysis and Optimization of Ultra-Low-Power Rectifier with High Efficiency for Applications in Wireless Power Transmission and Energy Harvesting
Abstract The system capable of harvesting RF energy from the environment through an antenna and converting it into direct current energy to deliver to a load is known as rectenna. The rectifier circuit is an important part of the rectenna and its modeling is arduous since it employs a non-linear device working at extremely low power levels. In addition, ther
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2020-03
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3. ANALYTICAL EXPRESSIONS FOR THE CONCENTRATION AND CURRENT IN THE REDUCTION OF HYDROGEN PEROXIDE AT A METAL-DISPERSED CONDUCTING POLYMER FILM
A mathematical model describing the reduction of Hydrogen peroxide (H2O2) to water in a metal dispersed conducting polymer film is discussed. The model is based on a system of reaction-diffusion equations containing a non-linear term related to Michaelis-Menten kinetics of the enzymatic reaction. The approximate analytical expressions corresponding to the co
Quím. Nova. Publicado em: 2020-01
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4. Avaliação de indicadores aplicados a sistemas de abastecimento de água de pequeno porte
RESUMO O presente trabalho visou avaliar, por meio de regressão linear múltipla (RLM), os indicadores que melhor exprimem a realidade dos sistemas de abastecimento de água de municípios de pequeno porte, com base nos desempenhos financeiro, operacional e de qualidade da água como variáveis de resposta. A organização e a seleção dos dados fiaram-se
Eng. Sanit. Ambient.. Publicado em: 20/12/2019
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5. A DISCRETE DYNAMICAL SYSTEM AND ITS APPLICATIONS
ABSTRACT The main goal of this manuscript is to introduce a discrete dynamical system defined by symmetric matrices and a real parameter. By construction, we rediscovery the Power Iteration Method from the Projected Gradient Method. Convergence of the discrete dynamical system solution is established. Finally, we consider two applications, the first one cons
Pesqui. Oper.. Publicado em: 02/12/2019
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6. Access to high-cost medications for psoriatic arthritis in the National Health System in Brazil: the long path up to dispensation
Abstract Background: Pharmaceutical Assistance (PA) is a dynamic and multidisciplinary process that aims to supply health systems, programs or services with quality medicines, enabling access and health care, in an efficient and timely manner. The objective of the study was to evaluate the profile of administrative processes for the treatment of PsA, identi
Adv. rheumatol.. Publicado em: 28/11/2019
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7. Associação entre excesso de peso e obesidade e mortalidade em capitais brasileiras e províncias argentinas
Resumo: O objetivo deste trabalho foi avaliar a associação da prevalência de excesso de peso e obesidade com as taxas de mortalidade total e específica nas capitais brasileiras e províncias argentinas. Estudo ecológico com dados secundários, em que as exposições principais foram as prevalências de excesso de peso e obesidade estimadas com base em d
Cad. Saúde Pública. Publicado em: 28/11/2019
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8. The Psychophysiological Responses of the Chronic Ischemic Stroke Patients to the Acute Stress were Changed
Abstract: Mood disorder is one of the complications of stroke. The inability to cope with stress is also a prognosis of depression and anxiety. The aim of this study is to assess the response of stress system in the post stroke patients. Twelve healthy controls (HC) and twelve post-stroke patients after filling in the State-Trait Anxiety Inventory completed
Braz. arch. biol. technol.. Publicado em: 25/11/2019
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9. Comparison and Combination of Techniques for Determining the Parameters of a Magnetic Hysteresis Model
Abstract The Jiles-Atherton scalar hysteresis model presents five parameters used to represent the material tested and used to calculate the magnetic losses. This article presents a comparative analysis of the performance of two methods of identifying these parameters. In the first method, the equations of Jiles-Atherton were assembled into a single non-line
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 12/09/2019
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10. Physical and geometric non-linear analysis using the finite difference method for one-dimensional consolidation problem
Abstract This article presents a numerical model based on the finite difference method for the physical and geometric non-linear analysis of a one-dimensional consolidation problem regarding a saturated, homogeneous and isotropic soil layer with low permeability and high compressibility. The problem is formulated by adopting the void ratio as the primary var
REM, Int. Eng. J.. Publicado em: 2019-06
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11. Estratificação horizontal da educação superior no Brasil: Desigualdades de classe, gênero e raça em um contexto de expansão educacional
Resumo O acesso ao ensino superior é fundamental para diminuir as desvantagens de pessoas com origens nos grupos menos privilegiados, na medida em que aumenta as chances de mobilidade social ascendente. A literatura sobre estratificação educacional nos ensina que tanto o acesso aos diferentes tipos de modalidade ofertada (bacharelados, licenciaturas, curs
Tempo soc.. Publicado em: 25/04/2019
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12. Strut-and-tie models for linear and nonlinear behavior of concrete based on topological evolutionary structure optimization (ESO)
Resumo A busca por sistemas resistentes representativos para estrutura de concreto requer profundo conhecimento sobre seu comportamento mecânico. Os modelos de bielas e tirantes são procedimentos clássicos utilizados no dimensionamento do concreto armado onde existem concentrações de tensão, as chamadas regiões descontínuas da estrutura. No entanto,
Rev. IBRACON Estrut. Mater.. Publicado em: 2019-02