Telecommunication Lines
Mostrando 1-7 de 7 artigos, teses e dissertações.
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1. The impact of urbanization on the distribution of lightning induced voltages on overhead lines / O impacto do aumento da urbanização nos niveis das tensões induzidas por descargas atmosfericas nas proximidades de linhas de transmissão
Some of the worst damage caused by lightning is indirect, that is, it is caused by electromagnetic fields radiated from this kind of natural phenomenon resulting in electromagnetic compatibility problems or in challenges for designers of surge protection systems and shields against these interferences. This work considers one of these indirect effects, induc
Publicado em: 2009
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2. O ICMS incidente sobre os serviços de comunicação
The work objective will be to outline the constitutional profile of the tax in the sphere of the States and of the Federal District incident over the provision of communication services. More than simply sketching the incidence matrix rule, the work dares to try to find the constitutional fundament that restricts taxation only and just to services with consi
Publicado em: 2008
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3. Longa distância : a evolução dos sistemas nacionais de telecomunicações da Argentina e do Brasil em conexão com as telecomunicações internacionais (1808-2003)
This dissertation sustains that, in broad lines, telecommunications have gone through three large historical phases since its beginning, little more than 200 years ago. After a pre-history where technologies were developed with governmental support or control, telecommunication services were commercially exploited in a competitive manner, virtually without s
Publicado em: 2007
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4. Robô móvel suspenso por fio com pernas de comprimentos variáveis / A mobile robot suspended by wire with variable length legs
Some theoretical and experimental studies have been developed in order to produce independent equipment for inspection and maintenance of electric power and telecommunication transmition lines, increasing the process efficiency and reducing the risk of accidents with the employees who execute the task. This activity suits mobile robots because they are able
Publicado em: 2006
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5. A mobile robot suspended by wire with variable length legs / Robà mÃvel suspenso por fio com pernas de comprimentos variÃveis
Some theoretical and experimental studies have been developed in order to produce independent equipment for inspection and maintenance of electric power and telecommunication transmition lines, increasing the process efficiency and reducing the risk of accidents with the employees who execute the task. This activity suits mobile robots because they are able
Publicado em: 2006
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6. Proposal and performance analysis of a combined input and output queuing packet switch / Proposta e analise de desempenho de um comutador de pacotes com enfileiramentos na entrada e na saida
A QoS (Quality of Service) provisioned CIOQ (Combined Input Output Queuing) switch using crossbar structure with m parallel lines per output port is proposed in this work. The packets at input buffers are transferred to the output buffers by means of mxN internal lines. Since all internal lines have the same speed as external links, no internal clock speedup
Publicado em: 2006
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7. Estudos de protetores híbridos contra transitórios elétricos para aplicação em linhas de telecomunicações
This thesis presents the test results of electrical transients protectors and hibrid circuits for telecommunication lines aplications. For tuis purpose, 1,2 x 50 us and 10 x 700 us surge generators were built up and later improved to deliver voltage and currents standard impulses whithout distortions and discontinuitys. New types of hibrid protectors are pro
Publicado em: 1997