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Transmission fiber chromatic dispersion dependence on temperature: implications...
Andre, PS; Teixeira, AL; Pinto, AN; Pellegrino, LR; Neto, BB; Rocha, JF; Pinto, JL; Monteiro, PNIn this letter we will evaluate the performance degradation of a 40 km high-speed (40 Gb/s) optical System, induced by optical fiber variations of the chromatic dispersion induced by temperature changes. The chromatic dispersion temperature sensitivity will be estimated based on the signal quality parameters.
Defeitos do Tubo Neural. Experiência de 10 Anos numa Maternidade Central
Teixeira, AL; Loreto, H; Machado, MC; Ramos de Almeida, JMOBJECTIVES: 1) To determine trends in prevalence of neural tube defects and the impact of therapeutic abortion. 2) To review perinatal management of spina bifida. DESIGN: All spontaneous and therapeutic abortions, still births and live births affected by neural tube defects registered in Alfredo da Costa Maternity in Lisbon, from 1983 to 1992, were retrospectively analysed. RESULTS: Eighty-two cases with neur...
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