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Coherent Fiber Communications Analyzer
Ricardo M. Ferreira; Ali Shahpari; Mário Lima; António L. TeixeiraThis paper addresses an coherent fiber communication analyzer with digital signal processing (DSP). First we make an overview of the investigations that are being conducted at Instituto de Telecomunicações (IT) in the coherent communications area and then introduce the coherent receiver used in the IT laboratory. We also present an interface developed in GUI of Matlab to analyze coherent signals. ...
Conversão de Comprimento de Onda Baseado em Four Wave Mixing
Francisco A. S. Couto; Rogério N. Nogueira; Paulo S. André; António L. TeixeiraAll-optical wavelength conversion is one of the major research topics in the optical networks area..Problems due to electrical conversion can be easily eliminated, such as thermic noise; its transparency to the shape of the signal and to the bit rate, makes this type of conversion an attractive solution.The ‘Four Wave Mixing’(FWM) process is one of these allopticaltechniques. The...
Estudo da Basic Need Satisfaction in General Scale para a língua portuguesa
Sousa, Sónia S.; Ribeiro, José Luís Pais; Palmeira, António L.; Teixeira, Pedro J.; Silva, Marlene NunesEste estudo descreve o processo de adaptação da versão portuguesa, de 21 itens, da Basic Need Satisfaction in General Scale da teoria de auto-determinação. O instrumento é composto por três subescalas que correspondem às três necessidades básicas (a) competência, (b) autonomia e (c) relações de pertença. Foi administrado em dois estudos independentes, 420 e 408 participantes respectivamente, com amostras de con...
Pulmonary vein pulsatility in fetuses of diabetic mothers: prenatal Doppler ech...
Zielinsky,Paulo; Piccoli Jr,Antonio L.; Teixeira,Lucas; Gus,Eduardo I.; Mânica,João L.; Satler,Fabíola; Vaz,Humberto; Nicoloso,Luiz H.OBJECTIVE: To verify the hypothesis that the pulmonary vein pulsatility index is higher in fetuses of diabetic mothers than it is in normal fetuses of nondiabetic mothers. METHODS: Twenty-four fetuses of mothers with either gestational or previous diabetes (cases), and 25 normal fetuses of mothers without systemic disease (control) were examined. Fetuses were examined through prenatal Doppler and color flow map...
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