Electromagnetic Waves
Mostrando 1-12 de 67 artigos, teses e dissertações.
-
1. People with amputation and musculoskeletal pain show reduced electrical activity of Alpha brain waves: cross-sectional study
RESUMO JUSTIFICATIVA E OBJETIVOS: A amputação acarreta quadros clínicos associados, como a dor musculoesquelética (DME), que causa sofrimento e interfere na vida do paciente. Por isso, o desenvolvimento de métodos diagnósticos para mensurar essas alterações são incentivados, como a eletroencefalografia quantitativa (EEGq). O objetivo deste estudo f
BrJP. Publicado em: 2022
-
2. Error Analysis of the Numerical Method for Correcting the Propagation of EM waves in the Troposphere
Abstract Electromagnetic (EM) waves do not travel in straight lines in the troposphere due to refraction. This leads to errors in many engineering applications. In order to correct these errors, a numerical solution based on the difference method has been proposed, which can reveal the degree of EM wave bending owing to atmospheric refraction, moreover, it c
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2020-09
-
3. Simulador didático para análise dos transientes de ondas de tensão em uma linha de transmissão similar à transmissão e reflexão de ondas eletromagnéticas
Abstract O modelo de educação nas últimas décadas passou por mudanças consideráveis do ponto de vista didático. Com o avanço da tecnologia, a velocidade de obtenção de informações aumenta e o uso de ferramentas que permitem a visualização dinâmica de conteúdos torna-se um forte aliado ao processo de ensino-aprendizagem. Este trabalho trata da
Rev. Bras. Ensino Fís.. Publicado em: 29/07/2019
-
4. Rediscutindo Soluções Numéricas de Equações de Onda
Resumo Nesta contribuição, é nosso principal objetivo apresentar um método numérico de solução da equação de onda, seja esta de origem mecânica ou eletromagnética. Baseando-nos nesta solução, podemos avaliar o comportamento destas ondas sob diferentes aspectos e condições, visto que, as ondas eletromagnéticas conseguem se propagar no vácuo,
Rev. Bras. Ensino Fís.. Publicado em: 27/06/2019
-
5. USE OF GROUND PENETRATING RADAR TO STUDY SPATIAL VARIABILITY AND SOIL STRATIGRAPHY
ABSTRACT Ground Penetrating Radar (GPR) is a geophysical method that uses electromagnetic waves to study subsurface structure in different fields such as geology, agriculture and civil engineering. The wave penetration in the soil is strongly controlled by the electrical conductivity of soil components such as clay, organic matter, and water. In this study,
Eng. Agríc.. Publicado em: 19/06/2019
-
6. On the Counterpropagation of Waves
Abstract This work analyses the counterpropagation of transversal plane waves in a linear, homogeneous, nondispersive, and isotropic medium. Although this is a traditional subject in disciplines associated with wave phenomena, a propagation analysis is not found in the literature. With this purpose, the resultant wave and consecutively its phase velocity in
Rev. Bras. Ensino Fís.. Publicado em: 18/10/2018
-
7. Effects of ceramic garments on 10-km running performance
ABSTRACT Aims The use of electromagnetic waves by phototherapy to skeletal muscle presents potential ergogenic effects. The aim of this study was to analyze the effect of using bioceramic clothes on performance, heart rate (HR) and rating of perceived exertion (RPE) during a 10 km race. Our hypothesis is that the use of such clothes modifies these variables
Motriz: rev. educ. fis.. Publicado em: 21/11/2017
-
8. Electromagnetic Properties of Multifunctional Composites Based on Glass Fiber Prepreg and Ni/Carbon Fiber Veil
ABSTRACT: Multifunctional composites combine structural and other physicochemical properties, with major applications in aeronautical, space, telecommunication, automotive, and medical areas. This research evaluates electromagnetic properties of multifunctional composites based on glass fiber woven fabric pre-impregnated with epoxy resin laminated together c
J. Aerosp. Technol. Manag.. Publicado em: 2017-06
-
9. Non-resonant Permittivity Measurement Methods
Abstract The measurement of the dielectric properties of materials has been applied in non-destructive tests, humidity measurement, soil analysis and even cancer detection. The methods have been developed for over 70 years based on the interaction of the electromagnetic waves with the material under test. This work presents a general model of scattering para
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2017-03
-
10. Polarization Diversity on ESM Systems
Abstract Polarization diversity antenna arrays are applied to electronic support measures (ESM) systems since the 1980s. However, even today modern systems are conceived with the employment of the traditional and inconvenient spiral antennas and there are no studies that evidences most of the benefits of this technique applied to them. This paper aims at sho
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2017-03
-
11. Feature Extraction of Structures in Sea Water Using Self-Organizing Maps and Electromagnetic Waves
RESUMO O uso do algorítmo de Mapas Auto-Organizáveis (SOM) para extração de características e redução de dimensionalidade aplicado à detecção de objetos subaquáticos em regiões marinhas foi apresentado. Simulações em Elementos Finitos foram utilizadas para a geração de um modelo direto da região de estudo e, a partir destes dados, um Mapa Au
TEMA (São Carlos). Publicado em: 2015-12
-
12. Cell phone radiation effects on cytogenetic abnormalities of oral mucosal cells
The aim of this study was to evaluate the effects of exposure to cell phone electromagnetic radiation on the frequency of micronuclei, broken eggs cells, binucleated cells, and karyorrhexis in epithelial cells of the oral mucosa. The sample was composed of 60 cell phone users, who were non-smokers and non-drinkers, and had no clinically visible oral lesions.
Braz. oral res.. Publicado em: 20/10/2015