Propagation Model
Mostrando 13-24 de 389 artigos, teses e dissertações.
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13. Crack and mechanical behavior of CFRP plate-reinforced bridge roofs under high temperature with different anchoring measures
Abstract This paper investigates the crack and mechanical behavior of CFRP plate-reinforced bridge roof under high temperature with different anchoring measures. Six CFRP-reinforced test beams with different anchoring schemes were designed and constructed. The beam specimens, after the high temperature effects, were tested under four-point bending loads. The
Lat. Am. j. solids struct.. Publicado em: 22/07/2019
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14. Preliminary investigation of Terahertz spectroscopy to predict pork freshness non-destructively
Abstract Freshness, a very important criterion for pork quality control, is normally assessed by the index of K value. In this paper, Terahertz (THz) spectroscopy was employed to predict K value of pork nondestructively. The THz spectra (0.2~2.0THz) of 80 pork samples with different freshness in the attenuated total reflectance (ATR) mode were acquired. Simu
Food Sci. Technol. Publicado em: 22/07/2019
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15. Modelo lógico de um programa de retorno ao trabalho: instrumento orientador para prevenir a incapacidade
Resumo Introdução: organizar e avaliar Programas de Retorno ao Trabalho (PRT) de indivíduos afastados por incapacidade, decorrente de lesões sofridas no ambiente laboral, é de grande importância para o Sistema Único de Saúde (SUS). Objetivo: construir o Modelo Lógico do PRT desenvolvido pelo Centro Estadual de Referência em Saúde do Trabalhado
Rev. bras. saúde ocup.. Publicado em: 22/07/2019
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16. Analytical solution for the stationary model of pollutant propagation in an aquatic medium
Resumo Este trabalho apresenta uma nova abordagem analítica para a solução de problemas de dispersão de poluentes ao longo de corpos hídricos com contornos irregulares. Nesta abordagem, a equação advectivo-difusiva é expressa em termos de coordenadas curvilíneas ortogonais que são definidas pelo potencial de velocidade e pela função de corrente c
Rev. Ambient. Água. Publicado em: 25/03/2019
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17. Fatigue degradation strategies to simulate crack propagation using peridynamic based computational methods
Abstract The aim of this paper is to develop new computational tools to study fatigue crack propagation in structural materials. In particular we compare the performance of different degradation strategies to study fatigue crack propagation phenomena adopting peridynamic based computational methods. Three fatigue degradation laws are proposed. Two of them ar
Lat. Am. j. solids struct.. Publicado em: 14/03/2019
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18. Study of cracks in concrete target under deep penetration by a projectile
Abstract A large number of cracks occur in concrete structure after projectile penetration. The study of crack distribution and propagation process is the basis of damage assessment, structural repair and high dynamic fracture mechanism. In this paper, wire saw cutting, X-ray computed tomography (X-CT) and mechanical property testing of damaged concrete were
Lat. Am. j. solids struct.. Publicado em: 14/03/2019
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19. Ray Tracing and Applications to an Evaporation Duct Model Based on Data from Oceanographic Buoy Sensors
Abstract The two-dimensional ray tracing method allows an easy and fast modeling of tropospheric propagation in the microwave frequency range. A version of this method that determines ray trajectories, amplitudes and delays of the electromagnetic field, as well as the propagation loss in a two-dimensional inhomogeneous environment will be described. The impl
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2019-03
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20. Vegetation Image as Bayesian Predictor for Radio Propagation in Complex Environments Using Unscented Transform
Abstract Vegetation is considered a complex environment for analysis of scattering and attenuation in radio propagation phenomena. Satellite image processing can improve planning of radio systems with a vegetation attenuation predictor. In this research, the prediction is based on the correlation of more than 56% between RGB pixel values and vegetation atten
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2018-06
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21. All-Optical Logic Gates Devices based on SPP Coupling between Graphene Sheets
Abstract The aim of this work is to propose all-optical logic gates based on surface plasmon polaritons (SPP's) coupling among spatially separated graphene sheets. This model consists of graphene nanoribbons embedded in silica (SiO2) substrate place in a distance such that allow an efficient coupling between the plasmonic modes of the waveguides. It was nume
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2018-06
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22. Measurement uncertainty of plane-strain fracture toughness KIC testing by the Monte Carlo Method
Abstract The reliable determination of materials' mechanical properties is a fundamental factor for their application in engineering, and the estimation of the measurement uncertainty in testing laboratories has a direct impact on the interpretation of the results. Recent literature demonstrates that one of the most widely used methodologies for uncertainty
REM, Int. Eng. J.. Publicado em: 2018-04
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23. Finite element simulation of fracture in a restored premolar tooth using high aspect ratio elements
Abstract Introduction The term cracked tooth syndrome refers to an incomplete fracture of a vital posterior tooth that involves the dentin and occasionally extends into the pulp. There is a very limited number of publications trying to model dentin crack growth using numerical techniques. Therefore, it is essential to numerically model this phenomenon in o
Res. Biomed. Eng.. Publicado em: 19/03/2018
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24. Propagation Model for Path Loss Through Vegetated Environments at 700 – 800 MHz Band
Abstract In almost all literature about propagation models through vegetated environments, path loss has been proposed based on specimens of temperate clime conditions. In this work, a new propagation model is proposed, based on measurements, carried out on vegetated environments with tropical specimens. These environments are common on suburban and rural ar
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2018-03