Standing Waves
Mostrando 1-12 de 20 artigos, teses e dissertações.
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1. Evaluación del entendimiento de ondas mecánicas utilizando un test de opción múltiple en español
Abstract The “Mechanical Waves Conceptual Survey (MWCS)”, is the most important multiple-choice test designed to date to evaluate the understanding of university students in four themes of mechanical waves: propagation, superposition, reflection, and standing waves. In this study, we present a significant modification of this test in Spanish. We administ
Rev. Bras. Ensino Fís.. Publicado em: 05/08/2019
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2. Soluções para uma Classe de Equações de Schrödinger Quase Lineares via Método de Nehari
In this dissertation, we study existence of both one-sign and nodal positive solutions (with exactly two nodal domains) for a class of quasilinear Schrödinger equations, which model physic phenomena, for example, in plasma physics. To obtain the results, it was used, mainly, the Nehari method, as well as, regularity theory of elliptic and Concentration-Comp
Publicado em: 2010
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3. Estudo da força de radiação acústica em partículas produzida por ondas progressivas e estacionárias. / Acoustic radiation force on particles produced by progressive and standing waves.
O objetivo deste trabalho é estudar o fenômeno da força de radiação acústica produzida por ondas progressivas e estacionárias. Neste trabalho o estudo da força produzida por ondas estacionárias é aplicado na análise de um levitador acústico e o estudo da força de radiação acústica por ondas progressivas é feito visando a futura construção
Publicado em: 2010
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4. Dynamic behavior of steel catenary riser due to vortex induced vibration in dreepwater / Comportamento dinamico de riser rigido em catenaria devido a vibração induzida por vortices em aguas profundas
O presente trabalho tem como objetivo principal caracterizar o comportamento dinâmico de risers em configuração catenária (SCR) sob os efeitos do fenômeno da vibração induzida por vórtices (VIV). Estes estudos foram realizados através de experimentos e simulações numéricas. O experimento foi realizado com modelo de SCR em escala reduzida em um ta
Publicado em: 2009
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5. Study of a class of quasilinear Schrodinger equation / Estudo de uma classe de equações de Schrodinger quase-lineares
In this work, we study questions related to existence, multiplicity and concentration behavior of standing waves, for a class of quasilinear Schrödinger equations, arising, for example, in Plasma Physics. To obtain our results, we use variational methods, such as, minimax theorems and also regularity theory of elliptic equations of second order
Publicado em: 2007
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6. Positivity properties and stability of periodic travelling wave solutions / Propriedades de positividade e estabilidade de ondas viajantes periodicas
Nesta tese estabelecemos condições suficientes para obter a estabilidade de soluções ondas Viajantes periódicas para equações de tipo KdV-type + ut +upux -- (Mu)x = 0, p ? N, com M sendo um operador pseudo-diferencial geral, porem com características especiais. Nossa abordagem é a de usar a teoria dos operadores totalmente positivos, o Teorema do So
Publicado em: 2007
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7. Quenching technology: a selected overview of the current state-of-the-art
Many papers have been published on a wide range of aspects of the fundamental physics and chemistry of quenching such as: additive technology, surface rewetting, hardness distribution prediction, role of heat transfer and residual stresses, etc.1,2. However, relatively little information has been published on the application of these insightful research resu
Materials Research. Publicado em: 2005-12
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8. O problema de Cauchy para a equação de Schrodinger não-linear não-local
ln this work we establish some properties of the nonlocal nonlinear Schrodinger equation (NLSNL). First of alI, we present a preliminary chapter with notations and basic theory used to establish our results; that part also seeks to facilitate the reading of this work. Soon afterwards comes the main result: local welI-posedness for the initial value problem (
Publicado em: 2005
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9. A design and study of the effects of selectivity on binary separation in a four-zone simulated moving bed for systems with linear isotherms
The simulated moving bed (SMB) is potentially an economical method for the separation and purification of natural products because it is a continuous processes and can achieve higher productivity, higher product recovery, and higher purity than batch chromatographic processes. Despite the advantages of SMB, one of the challenges is to specify its zone flow r
Brazilian Journal of Chemical Engineering. Publicado em: 2003-06
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10. Detecção de vazamentos em tubulações atraves da analise espectral de transientes de pressão
The development and test of a technique for leak detection in pipelines is presented. The technique is based on the spectral analysis of pressure signals measured in pipeline sections where the formation of stationary waves is favoured, allowing leakage detection during the start stop of pumps. Experimental tests were performed in a 1250 m long pipeline for
Publicado em: 2002
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11. Analise numerica e experimental de fluxo de energia em estruturas
This work deals with the theoretical, numerical and experimental aspects of energy flow in structures. The mathematical formulation for computation of power flow maps is presented for beams (Euler-Bernoulli and Timoshenko) and plates (Kirchhoff and Mindlin) The physical meaning of active and reactive power is discussed. The reactive intensity is related with
Publicado em: 2001
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12. Use of forward pressure level to minimize the influence of acoustic standing waves during probe-microphone hearing-aid verification
Probe-microphone measurements are a reliable method of verifying hearing-aid sound pressure level (SPL) in the ear canal for frequencies between 0.25 and 4 kHz. However, standing waves in the ear canal reduce the accuracy of these measurements above 4 kHz. Recent data suggest that speech information at frequencies up to 10 kHz may enhance speech perception,
Acoustical Society of America.