Surface Physics
Mostrando 1-12 de 57 artigos, teses e dissertações.
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1. Interplay between Near-Field Properties and Au Nanorod Cluster Structure: Extending Hot Spots for Surface-Enhanced Raman Scattering
Materials science has observed a continuous increase in the use of metal nanoparticles in a wide range of studies, from fundamental physics to technological applications such as photocatalysis and optical communication devices. This broad scope has the same fundamental origin, the localized surface plasmons, whose excitation leads to strong light confinement
J. Braz. Chem. Soc.. Publicado em: 24/10/2019
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2. Influência da temperatura sobre a agregação do solo avaliada por dois métodos
Resumo As queimadas elevam a temperatura da superfície do solo podendo reduzir sua agregação. Sendo assim objetivou-se avaliar a influência da temperatura sobre a agregação do solo em diferentes manejos pelo método de peneiramento em água e a seco. O experimento foi conduzido no laboratório de Física dos Solos da Universidade do Estado da Bahia (UN
Ciênc. Florest.. Publicado em: 30/09/2019
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3. Hydrostatic Equilibrium between Soil Samples and Pressure Plates Used in Soil Water Retention Determination: Consequences of a Questionable Assumption
ABSTRACT Soil water retention is among the soil hydraulic properties most routinely measured in studies of soil physics and related areas. This property is used in dynamic simulations of vadose zone processes such as soil water availability, surface boundary processes of evaporation and infiltration, and the fate of soil pollutants. The most common measureme
Rev. Bras. Ciênc. Solo. Publicado em: 29/07/2019
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4. Braquistócrona na esfera
Abstract O problema consiste em determinar a trajetória (entre dois pontos dados) de menor tempo de um corpo, que parte do repouso, restrito a se mover numa superfície esférica e sujeito a um campo gravitacional constante. Através da equação de Euler-Lagrange, obtém-se uma expressão para o tempo total de percurso. O problema foi resolvido numericamen
Rev. Bras. Ensino Fís.. Publicado em: 22/07/2019
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5. Analysis of Thermo-Mechanical Stress in Fiber Bragg Grating Used for Hydro-Generator Rotor Temperature Monitoring
Abstract Fiber Bragg gratings (FBGs) offer new possibilities to monitor accurately the rotor temperature. Dozens of sensors can be mounted in series in a single fiber and used to measure the temperature in several points of the rotor winding. Such sensors installed directly on the rotor winding surface are thermally isolated from the cooling air by a silicon
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2017-04
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6. Flow behavior of unsteady incompressible Newtonian fluid flow between two parallel plates via homotopy analysis method
Abstract An analysis has been performed to study the problem of the flow of incompressible Newtonian fluid between two parallel plates where the upper plate is impermeable and can move up or down and the lower one is fixed and has a porous surface. The governing equations for this problem are reduced to an ordinary form and is solved using Homotopy Analysis
Lat. Am. j. solids struct.. Publicado em: 2015-10
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7. Numerical prediction of bed-load and surface deformation on a granular bed sheared by a turbulent boundary-layer
The entrainment of solid particles by a fluid flow is frequently found in nature and in industry. A better knowledge of this is of importance to understand the physical nature of the phenomenon and to improve industrial processes. Bed-load occurs if the shear stresses exerted by the fluid on the granular bed are bounded to some limits: a mobile granular laye
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2012-03
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8. Sobre a evolução hidrodinâmica da matéria nuclear criada em colisões de íons pesados relativísticos - um estudo com condições iniciais flutuantes / On the hydrodynamic evolution of the nuclear matter created in relativistic heavy ion collisions - a study with fluctuating initial conditions
In this work we apply a hydrodynamic model with fluctuating initial conditions in a event by event basis to study some observables in relativistic heavy ion collisions. We show that the introduction of fluctuations, characterized by longitudinal high energy density tubes, turn the computation of the observables closer to data, in comparison to the traditiona
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 12/09/2011
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9. Uma Nova EstratÃgia para Renderizar Descontinuidades e SuperfÃcies Intersectantes em Modelos Baseados em Splats / A New Strategy for Render and Surface Discontinuities in Models Based on Intersecting Splats
Splats based models have gained increasing attention due to its potential for rendering complex geometric models efficiently and with high quality. The absence connectivity information of these models allows complex modeling operations, as Boolean operations, and fractures in physics simulations. However, these operations often generate models with edges and
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/02/2011
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10. Líquidos nemáticos e relatividade geral
In the mean 80´s, it was proposed that the rheologic properties of liquidcrystal could be obtained through affine transformation, in which the interaction potential of aspheric molecule is deformed to assume the ellipsoidal shape of potential liquid crystal´smolecular interaction. When this procedure is done point to point, the usuals derivatives donot get
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/07/2010
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11. Modificação de superfície de diamante utilizando plasma e caracterização por kelvin force microscopy / Modification of diamont surface using plasma and characterization by kelvin force microscopy
Neste trabalho nós produzimos e caracterizamos superfícies de diamante policristalino com áreas seletivas oxidadas e fluoradas a partir de superfícies originalmente hidrogenadas, usando um canhão de plasma para bombardear a superfície do diamante. A técnica que foi utilizada para a produção de filmes de diamante com superfícies hidrogenadas foi a d
Publicado em: 2010
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12. Desempenho de plantas de cobertura no controle da erosão hídrica no Sul de Minas Gerais / Performance of cover crops to control erosion in the South of Minas Gerais
The erosion initiates with the impact of the raindrop on the soil surface, causing the transport of sediment, nutrients and organic matter. To reduce this erosion, the use of conservation practices, such as proper management and planting of cover crops that reduce these losses, is essential. The objective of this study was to evaluate the potential of plant
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/12/2009