Satellite
Mostrando 1-12 de 1597 artigos, teses e dissertações.
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1. Analysis of Wet Antenna Losses on 11.843 GHz Slant Path in Nigeria and Comparison with Some Tropical Climates
Abstract The amount of water deposits on the receiving dish antenna can cause additional losses and consequently contaminate the actual slant-path attenuation. Only a few research works have been reported in the literature on the measurement of wet antenna attenuation (WAA) and the technique(s) of extracting the losses from the total attenuation in tropical
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2022
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2. A Wideband and Wide Axial Ratio Bandwidth Circularly Polarized Antenna Loaded with Circular Ring Slot
Abstract The presented model for wideband circularly polarized microstrip antenna is an improved version of the previous models which is widely applicable to satellite, microwave relay and radar. The designed circularly polarized antenna having overall volume of 20× 20 × 1.6 mm3 actively works at the impedance bandwidth of 9000 MHz (4.0–12.9 GHz) having
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2022
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3. Application of satellite imagery to update depth-area-volume relationships in reservoirs in the semiarid region of Northeast Brazil
RESUMO Os reservatórios são a principal fonte de abastecimento de água na região semiárida do Estado de Pernambuco, Brasil, devido à constante escassez de água que impacta essa região. O conhecimento da quantidade de água disponível é extremamente importante para uma gestão eficaz dos recursos hídricos. O cálculo do volume de água armazenado n
Revista Brasileira de Engenharia Agrícola e Ambiental. Publicado em: 2022
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4. SATELLITE CELL ACTIVATION AND SIGNALING PATHWAY RESPONSE IN JOINT EXERCISE ATHLETES
RESUMO Introdução: As células satélites musculares esqueléticas são consideradas a única fonte de células-tronco para a diferenciação miogênica das células musculares esqueléticas adultas. Após a estimulação, a célula satélite muscular esquelética pode ser ativada através de vias de sinalização específicas, proliferar e diferenciar-se
Revista Brasileira de Medicina do Esporte. Publicado em: 2022
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5. Assessment of Total Attenuation and Adaptive Scheme for Quality of Service Enhancement in Tropical Weather for Satellite Networks and 5G Applications in Nigeria
Abstract The dynamic weather condition is a major concern for optimum channel utilization in recent times, especially at higher frequencies with larger bandwidth for 5G applications. Over the years, rain-induced attenuation among the hydrometeors has been linked as the major cause of signal impairment especially at the frequency, f ≥ 10 GHz. However, when
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2021-06
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6. O Que Faz um Artigo ser Mais Citado?
Abstract The Guacuí and Batatal lineaments in the southern region of the state of Espírito Santo (southeastern Brazil) can be traced from satellite images for tens of kilometers. They are considered shear zones associated to the final tectonic stages of the Araçuaí-West Congo (A-WC) Orogen during the Ediacaran-Cambrian period. In order to understand thei
Rev. adm. contemp.. Publicado em: 2020-12
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7. Structure and tectonic significance of high- and low-temperature deformation along the lateral escape-related Guaçuí and Batatal shear zones, southern Araçuaí Orogen (southeastern Brazil)
Abstract The Guacuí and Batatal lineaments in the southern region of the state of Espírito Santo (southeastern Brazil) can be traced from satellite images for tens of kilometers. They are considered shear zones associated to the final tectonic stages of the Araçuaí-West Congo (A-WC) Orogen during the Ediacaran-Cambrian period. In order to understand thei
REM, Int. Eng. J.. Publicado em: 2020-12
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8. A SPECTRAL AGROMETEOROLOGICAL MODEL FOR ESTIMATING SOYBEAN GRAIN PRODUCTIVITY IN MATO GROSSO, BRAZIL
ABSTRACT This study used spectral data integrated with the agrometeorological model by Doorenbos and Kassam to estimate soybean grain productivity in the state of Mato Grosso, Brazil. In the developed model, spectral data were used instead of meteorological data and biophysical parameters of the crop. For this purpose, the products of real and potential evap
Eng. Agríc.. Publicado em: 2020-06
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9. VEGETATION INDICES FOR IRRIGATED CORN MONITORING
ABSTRACT Monitoring of large agricultural lands is often hampered by data collection logistics at field level. To solve such a problem, remote sensing techniques have been used to estimate vegetation indices, which can subsidize crop management decision-making. Therefore, this study aimed to select vegetation indices to detect variability in irrigated corn c
Eng. Agríc.. Publicado em: 2020-06
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10. DETERMINATION OF SOIL VOLUME BY PLANIALTIMETRIC SURVEY METHODS
ABSTRACT Considering the importance of topographic surveys to determine soil volumes and study efficient and accessible alternatives for this operation, this study aimed to analyze methods and respective equipment for planialtimetric surveys to determine soil volume. An experimental grid was installed in an area locate in Fernandópolis, SP, Brazil, in which
Eng. Agríc.. Publicado em: 2020-04
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11. Mutual Coupling Reduction in Phased Array Antennas Applying High-Impedance Surface at X Band
Abstract This paper presents a microstrip phased array using High Impedance Surface - Electromagnetic Bandgap (HIS-EBG) in order to minimize the effects of mutual coupling among the antenna elements. Each element of the array is fed by a coaxial cable allowing the beam steering by controlling the signal of the input port of each element. This phased array op
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2020-03
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12. Harmonization of epidemiological studies on dementia in Latin America Why does it matter?
RESUMO As evidências científicas sobre demência na América Latina (AL) são limitadas e variam entre e dentro dos países, o que contribui para um atraso no estabelecimento e na implementação de planos de ação para demência por governos e serviços. A harmonização de medidas por instrumentos padronizados e o uso de bancos de dados unificados que a
Dement. neuropsychol.. Publicado em: 09/12/2019