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Auto-pulsação em Lasers de Semicondutor por Bloqueio de Modos e por Injecção

This article describes two techniques for operating a semiconductor laser in a pulsed regime, namely the mode locking and injection locking mechanisms. For each one we present the operational principle, the theory and simulation results. We also describe the self Q-switching mechanism in multi-sections DFB lasers. ; Este artigo descreve duas técnicas de operar um laser de s...

Auto-pulsação em Lasers de Semicondutor por Comutação do Ganho e do Factor de Q...

This article describes two techniques for operating a semiconductor laser in a pulsed regime, namely the gain switching and Q-switching mechanisms. For each one we present the operational principle, the theory and simulation results. ; Este artigo descreve duas técnicas de operar um laser de semicondutor em regime pulsado, nomeadamente o mecanismo de comutação...

Técnicas de Extracção Óptica de Relógio

With the increasing traffic and consequent demand for higher bitrates, optical telecommunications networks include new systems operating exclusively in the optical domain, thus avoiding the optical to electrical conversion. Modules implementing the procedure of alloptical clock recovery are of extreme importance because the produced signal has all the synchronisation information&nb...

To whom is "problemas de nervos" meaningful?

As boas práticas de maneio da água em suinicultura, como factor limitante para ...

The aim of this work was to demonstrate in commercial pig farms focused in the lactation and gestation production stages, the importance to adopt good management practices for water use on the value of slurry as fertilizer. It was performed during 18 month a field study, involved four farrow-to-finishing units. During this period its was evaluated the water consumption and slurry production associated to the so...

Desempenho de híbridos simples de milho no nordeste brasileiro: safra 2008/2009.

2010

Desempenho de híbridos simples de milho no nordeste brasileiro: safra 2008/2009.

2010

Desempenho de cultivares de milho em diferentes ambientes do Nordeste brasileir...

2009

Desempenho de híbridos de milho na região agreste do nordeste brasileiro: safra...

2009

Acquisition and analysis of 3D mandibular movement using a device based on elec...

In dental medicine, the study of mandibular movement has an important role in oral rehabilitation as it allows diagnosis of pathologies in the temporomandibular joint and the definition of adequate treatment plans. In this paper, a new device specially developed for the acquisition and analysis of 3D mandibular movement is presented. A facial arc is adopted as its main support structure and electromagnetic sens...