Application Frequency
Mostrando 13-24 de 818 artigos, teses e dissertações.
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13. Grating Lobes Suppression in Frequency Selective Surfaces Using Electromagnetic Band Gap with Square Holes
Abstract In this paper, the authors present a proposal for an application of electromagnetic bandgap (EBG), for suppression of grating lobes, in frequency selective surfaces (FSS), not yet studied in the literature. An alternative type of EBG with square holes was proposed to reduce the computational effort in simulations. The study consists of an applicatio
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2020-12
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14. Strategies used to control the costs of underground ventilation in some Brazilian mines
Abstract In an underground mine, the ventilation is responsible for 25% to 50% of its electrical energy consumption. In countries such as South Africa, United States and Canada researchers have started to achieve a significant reduction in energy consumption without neglecting aspects of the quantity and quality of air required for the best performance of th
REM, Int. Eng. J.. Publicado em: 2020-12
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15. ELECTRICAL NOISES REDUCTION IN NANOPORES EXPERIMENTS BASED ON CONSENSUS FILTER
Nanopore has developed into an indispensable tool for single molecules experiments, where useful information about the characteristics of DNA/RNA can be obtained from the flowing of ionic current elicited by individual molecules as they traverse a single nanometer-scale aperture. However, due to the relatively high background current noise and low measuremen
Quím. Nova. Publicado em: 20/07/2020
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16. Higher Order Mode Attenuation in Microstrip Patch Antenna with DGS H Filter Specification from 5 to 10 GHz Range
Abstract This work proposes the application of a slot in the ground plane, Defected Ground Structure (DGS), of a microstrip patch antenna. The application of this technique aims to attenuate higher-order excited modes without deteriorating the antenna parameters in the fundamental mode. The methodology for the design of the slot in H-format is presented, bas
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2020-06
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17. A survey of parabens in commercial baby wipes from Brazil and estimation of daily exposure
Several studies have shown endocrine-disrupting effects of parabens. Parabens are a group of antimicrobials used as preservatives in a wide variety of products, mainly in personal care products. However, little information is available regarding the occurrence of parabens in baby products. In this study, the concentrations of five commonly used parabens, met
Quím. Nova. Publicado em: 2020-04
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18. Influência da frequência e participação no desempenho em um ambiente de aprendizagem centrado no aluno
The aim of this research was to verify student performance, participation and frequency when they study in a student-centered learning environment. Data collection included the application of questionnaires and semi-structured interviews. Data analysis combined quantitative and qualitative approaches. In the results on frequency and participation, 32% of the
Quím. Nova. Publicado em: 2020-02
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19. Bioprosthesis versus Mechanical Valve Heart Prosthesis: Assessment of Quality of Life
Abstract Background: The aim of this study was to evaluate the QoL of patients undergoing heart valve replacement using the SF-36 questionnaire, compare it between patients with mechanical prosthesis and patients with bioprosthesis, and correlate the results with sociodemographic variables. Objective: To assess the QoL of patients undergoing heart valve re
Int. J. Cardiovasc. Sci.. Publicado em: 2020-02
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20. Avaliação da Demanda Preliminar de Atendimento Dirigida pelo Aluno ao Núcleo de Apoio Psicopedagógico ao Estudante da Faculdade de Medicina (Napem) da Universidade Federal de Minas Gerais
RESUMO O sofrimento psíquico do estudante universitário, particularmente do estudante de Medicina, é conhecido e tem sido motivo de preocupação. O Núcleo de Apoio Psicopedagógico ao Estudante da Faculdade de Medicina (Napem) da Universidade Federal de Minas Gerais tem como função acolher o estudante que demanda ajuda espontaneamente. O objetivo dest
Rev. bras. educ. med.. Publicado em: 13/01/2020
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21. BADMINTON: POSSIBILIDADES DE ENSINO APLICADAS AO CONTEXTO DA EDUCAÇÃO FÍSICA ESCOLAR
RESUMO A forma de ensinar esportes na educação física escolar tem se modificado ao longo das últimas décadas, mas no Brasil esta transformação pedagógica ainda é recente, com estudos de intervenção dessa natureza sendo publicados a partir de 1993, porém ainda utilizando métodos tradicionais. O estudo objetivou demonstrar que o badminton pode ser
J. Phys. Educ.. Publicado em: 20/12/2019
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22. Use of PET/CT to aid clinical decision-making in cases of solitary pulmonary nodule: a probabilistic approach
Resumo Objetivo: Determinar a frequência em que a PET/CT com FDG-18F muda a classificação de probabilidade de malignidade do nódulo pulmonar solitário. Materiais e Métodos: Foi realizada análise retrospectiva de todas as PET/CTs com FDG-18F realizadas entre maio/2016 e maio/2017 num serviço de medicina nuclear, cuja indicação era a avaliação de
Radiol Bras. Publicado em: 20/12/2019
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23. INNOVATION SYSTEM IN AIR TRANSPORT MANAGEMENT
Abstract Identifying previous research subjects on innovation management in air transport provides not only updated references on new technologies in this industry, but also indicates which areas need to be prioritized in future research. A systematic literature review of publications in this field over the past decade, from 2005 to 2015, including 2016 publ
JISTEM J.Inf.Syst. Technol. Manag.. Publicado em: 02/12/2019
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24. Aplicação do Formalismo CTP em uma Ação com Operador Pseudo-Diferencial
Resumo O formalismo CTP (closed-time-path) é uma ferramenta matemática para calcular funções de Green em sistemas físicos. A principal vantagem desta técnica é a de que, ao contrário do formalismo de Feynman, o formalismo CTP pode ser aplicado em sistemas fora do equilíbrio. Por outro lado, em física da matéria condensada, alguns modelos não loca
Rev. Bras. Ensino Fís.. Publicado em: 25/11/2019