Digital Relay
Mostrando 13-17 de 17 artigos, teses e dissertações.
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13. EFFECTS OF ATMOSPHERIC MULTIPATH IN LINE-OF -SIGHT MICROWAVE SYSTEMS / EFEITOS DE MULTIPERCURSOS ATMOSFÉRICOS EM ENLACES DE MICROONDAS EM VISIBILIDADE
The variations which happen in the troposphere layers throughout the time in relation to the median condition of the signal cause various phenomena that change the received signal level at digital radio relay systems randomly. The random changes are named fading. Fading is normally classified as fast or slow. The former is normally associated with the atmosp
Publicado em: 2004
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14. Localização de faltas em linhas de transmissão utilizando a teoria de ondas viajantes e transformada Wavelet / Fault Location in Transmission Lines Using Traveling Waves and Wavelet Transform Theory
This work presents a wavelet transform (WT) application to analyze the high frequency transients in a transmission line caused by a fault, with the purpose of determining its accurate location. The WT is very similar to Fourier Transform (FT), with an important difference: it allows the time determination of different frequency components of a signal. This s
Publicado em: 2003
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15. Redes ATM : uma visão geral
Este trabalho tem por objetivo servir como uma referência para o estudo da tecnologia ATM (Modo de Transferência Assíncrono) e de sua relação com os outros tipos de redes existentes atualmente, tais como, X.25, Frame Relay, IP, etc. O ATM permite a integração destes protocolos e serviços em uma arquitetura única. Neste sentido, mostraremos como a te
Publicado em: 1997
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16. A performance comparison of communication links between rural hospitals and a digital health sciences library.
BACKGROUND: Rural physicians need access to digital health sciences libraries (DHSLs) that is easy and reasonably rapid. The goal of this project was to study rural hospitals' access to a DHSL on the Internet, by comparing differing access speeds with differing costs and their acceptability for retrieving text, image, and video information in a DHSL. METHODS
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17. Application of a Microcomputer-Based System to Control and Monitor Bacterial Growth
A modular microcomputer-based system was developed to control and monitor various modes of bacterial growth. The control system was composed of an Apple II Plus microcomputer with 64-kilobyte random-access memory; a Cyborg ISAAC model 91A multichannel analog-to-digital and digital-to-analog converter; paired MRR-1 pH, pO2, and foam control units; and in-hous