Oscillations
Mostrando 25-36 de 1048 artigos, teses e dissertações.
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25. Women with Polycystic Ovarian Syndrome Exhibit Reduced Baroreflex Sensitivity That May Be Associated with Increased Body Fat
Resumo Fundamento: As mulheres com síndrome do ovário policístico (SOP) apresentam alta prevalência de obesidade e alterações no controle autonômico cardiovascular, principalmente modificações na modulação autonômica da variabilidade da frequência cardíaca (VFC). No entanto, existem poucos estudos sobre outros parâmetros de controle autonômi
Arq. Bras. Cardiol.. Publicado em: 28/02/2019
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26. Energy harvesting through pendulum motion and DC generators
Abstract In this paper a mathematical model was found, and numerical results obtained for the pendulum behavior when coupled to a DC generator. A simple pendulum is vertically excited on its support and consequently exhibiting oscillations and rotations. The motion of the pendulum spins the axis of a DC generator and inducing a current. The dynamic model inv
Lat. Am. j. solids struct.. Publicado em: 18/02/2019
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27. Business cycles and earnings management strategies: a study in Brazilian public firms,
RESUMO Este estudo contribui para a literatura que trata da influência de fatores macroeconômicos sobre a qualidade das informações contábeis, pois analisa as estratégias de gerenciamento de resultados contábeis das firmas, identificando, especificamente, comportamentos discricionários distintos entre os ciclos econômicos: 1) níveis diferentes de g
Rev. contab. finanç.. Publicado em: 10/01/2019
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28. Dificultades conceptuales y matemáticas del modelo convencional de oscilaciones amortiguadas
Abstract A mathematical study on the subject of damped oscillations is expounded, focused on the computation of the constants of the equation of movement, their mathematical meaning and their implications on the behavior of systems. Examples are given of the initial value method for computing the constants, both for free and damped oscillations. Algebraic ex
Rev. Bras. Ensino Fís.. Publicado em: 06/12/2018
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29. Evaluation of Oxidative Stability of Compound Oils under Accelerated Storage Conditions
ABSTRACT The oxidative stability of linseed (L), cotton (A), and coconut (C) oils, as well as of linseed:cotton (LA), linseed:coconut (LC), and linseed:cotton:coconut (LAC) compound oils was evaluated under accelerated storage at 60°C/20 days. Coconut oil showed to be rather stable, mainly due to low levels of peroxides, conjugated dienes, ρ-anisidine, and
Braz. arch. biol. technol.. Publicado em: 14/11/2018
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30. Simple but accurate periodic solutions for the nonlinear pendulum equation
Abstract Despite its elementary structure, the simple pendulum oscillations are described by a nonlinear differential equation whose exact solution for the angular displacement from vertical as a function of time cannot be expressed in terms of an elementary function, so either a numerical treatment or some analytical approximation is ultimately demanded. Su
Rev. Bras. Ensino Fís.. Publicado em: 21/09/2018
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31. Simulación matemática para la optimización del patrón de flujo entregado por una buza para el molde de colada continua de planchón delgado
ABSTRACT Understanding the behavior of the oscillations of the jets into the mold of thin slab funnel is essential to ensure a constant supply of liquid steel, improve control of the flow patterns and consequently increase plant productivity and the final product quality. To achieve this, we conducted a study of the effect of the internal design of the nozzl
Matéria (Rio J.). Publicado em: 19/07/2018
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32. Transition from Thermokinetic to Chemical Instabilities in a Modified Sal’nikov Model
Traditionally, thermokinetic and chemical oscillations have been studied independently, but in cellular media recent studies have shown that cell’s temperature is not uniform. Thus, on this context it is possible to inquire about the influence of thermal effects on chemical oscillatory behavior and vice versa. To this end, in this paper we propose a dynami
J. Braz. Chem. Soc.. Publicado em: 2018-07
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33. Fracture Behavior and Fatigue Performance of Inconel 625
Inconel 625 is a nickel-based highly-resistant superalloy widely used in aerospace components, in the nuclear industry, and especially in the maritime industry. Materials such as Inconel 625 have been widely used in oil exploration of Brazilian pre-salt layers due to their excellent resistance to corrosion under tension, pitting and crevice corrosion by chlo
Mat. Res.. Publicado em: 25/06/2018
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34. An Improved Dynamic Contact Model for Mass–Spring and Finite Element Systems Based on Parametric Quadratic Programming Method
Abstract An improved dynamic contact model for mass-spring and finite element systems is proposed in this paper. The proposed model avoids the numerical troubles of spurious high-frequency oscillations for mass-spring and finite element systems in dynamic contact problems by using the parametric quadratic programming technique. The iterative process for det
Lat. Am. j. solids struct.. Publicado em: 26/04/2018
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35. An enriched meshless finite volume method for the modeling of material discontinuity problems in 2D elasticity
Abstract A 2D formulation for incorporating material discontinuities into the meshless finite volume method is proposed. In the proposed formulation, the moving least squares approximation space is enriched by local continuous functions that contain discontinuity in the first derivative at the location of the material interfaces. The formulation utilizes sp
Lat. Am. j. solids struct.. Publicado em: 26/04/2018
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36. Error variance of short duration sieving
Abstract In this study, the variance of ordinary sieving test error was determined concerning the specification limit of sized iron ore product by subtracting the fundamental error (described by the Gy's formalism for sampling), from the global error (recoverable from database of historical values). The results allowed the calculation of the confidence inter
REM, Int. Eng. J.. Publicado em: 2018-04