Results 21 to 30 of about 60,054 (191)
Diseño e Implementación de Antenas de Microlínea
Maskay, 2011 El presente artículo presenta el diseño e implementación de antenas planas, mejor conocidas como Antenas de Microlínea para aplicaciones de Radio Frecuencia y Microonda, utilizando materiales de fácil acceso en el mercado nacional.
David Donoso +2 more
doaj +1 more source
Desenvolvimento de etiquetas RFID-UHF têxteis
Revista Principia, 2020 Este artigo propõe o desenvolvimento de antenas têxteis para aplicações em sistemas de identificação por radiofrequência (RFID). O tecido jeans, comercialmente vendido, foi utilizado como substrato dielétrico, e como condutor, um tecido de poliéster com ...
Rudrigo Rangel Lima +4 more
doaj +1 more source
Revista Principia, 2014 Este artigo trata da análise experimental de antenas planares, com geometria do patch dos tipos retangular, circular e triangular, com alimentação por linha de microfita e técnica de casamento de impedância através de reentrâncias (inset feed ...
Jefferson Costa e Silva
doaj +1 more source
Desarrollo de un sistema de nivelación de antenas HF en terrenos irregulares en Colombia
Perspectivas en Inteligencia, 2023 Los campos de antenas utilizados en la banda de alta frecuencia (High Frecuency) son esenciales para la ejecución de operaciones de radiogoniometría y tácticas de Guerra Electrónica (Electronic War) en inteligencia de señales. Estos sistemas requieren en
Diana Patricia Gómez Vargas +3 more
doaj +1 more source
Dimensiones sociales de los riesgos tecnológicos : el caso de las antenas de telefonía móvil [PDF]
, 2006 La reciente proliferación de la telefonía móvil ha provocado un incremento de la preocupación pública por los posibles efectos de los campos electromagnéticos sobre la salud humana y sobre el medio ambiente. Aquí se presentan algunos de los resultados de
Espluga, Josep,
core +3 more sources
Revision of Manettia (Rubiaceae) in Paraguay
Nordic Journal of Botany, Volume 2026, Issue 2, February 2026.Manettia Mutis is a Neotropical genus comprising over 100 species, many of which are only known from their original descriptions or, at most, from revisions dating back over 100 years. Recent review studies have remained unpublished for several years. Conventional taxonomic methods are followed.
Silvana Yasmin Gauto +2 more
wiley +1 more source
Antenas multifrecuencia y multifunción basadas en tecnología impresa simple parcialmente rellenas con estructuras metamateriales [PDF]
, 2008 El grupo de Radiofrecuencia de la Escuela Politécnica Superior de la Universidad Carlos III de Madrid lleva desarrollando desde hace muchos años antenas basadas en tecnología impresa.
Segovia Vargas, Daniel
core +1 more source
Water Resources Research, Volume 61, Issue 4, April 2025.Abstract Inland waters emit large amounts of carbon and are key players in the global carbon budget. Particularly high rates of carbon emissions have been reported in streams draining mountains, tropical regions, and peatlands. However, few studies have examined the spatial variability of CO2 concentrations and fluxes occurring within these systems ...
Keridwen M. Whitmore +5 more
wiley +1 more source
Bidimensional scattering of tm and te polarized waves by dielectric [PDF]
, 1993 In the study of electromagnetic radiation effects over dielectric bodies, effective numerical methods are needed. At present, there is a lack of tools for measuring this effects and due to the huge growth of microwave devices, like cellular radio ...
Cardama Aznar, Ángel +3 more
core +1 more source
European Journal of Social Psychology, Volume 55, Issue 2, Page 396-415, March 2025.ABSTRACT Perceiving income disparities has a limited impact on attitudes towards reducing economic inequality. In this research, we proposed a novel and alternative strategy by focusing on other aspects intrinsically related to economic inequality, such as unequal access to health and education resources.
Francisco Miguel Soler‐Martínez +2 more
wiley +1 more source