Rafael J. Betancourt

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The investigators examined the potential influence of social support on age-related differences in resting cardiovascular function and the potential mediators responsible for such associations in 67 normotensive women and men. Consistent with prior research, age predicted increased resting systolic blood pressure (SBP) and diastolic blood pressure (DBP).(More)
We propose a methodology that uses a new phase noise model to trade-off phase noise and power dissipation in the design of ring oscillators suitable for frequency synthesis. We compare the theoretical phase noise performance of three buffer stages using clamped, symmetric and cross-coupled loads, respectively. We propose a cross-coupled buffer topology that(More)
Mangiferin, a bioactive metabolite having potent antioxidant and pharmacological properties has been obtained in this work by microwave assisted extraction (MAE) technique, from Mangifera indica leaves. A Box– Behnken design was used to evaluate the effect of three parameters: microwave power, the time of extraction, and the ratio of solvent to raw material(More)
This paper discusses a Back-to-Back (BTB) power converter based solution to avoid the overloaded operation of two low voltage feeders operating in parallel. With this purpose the BTB converter based on eight conditions of operation is proposed as means to exchange load between feeders to prevent overload conditions and balance the load on power transformers.
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