Bifurcation analysis is performed to a power-factor-correction (PFC) boost converter to examine the fast-scale instability problem. Computer simulations and analysis reveal the possibility of period-doublingfor some intervals within the line cycle. The results allow convenient prediction of stability boundaries. Analytical equations and design curves are given to facilitate the selection of par...

Context: In power electronics applications, it is important to make comparisons between converters choose the device that best suits a particular application. This paper compares Boost converter and hybrid converter. The operating models of both under study are developed explained in detail allow for proper comparison analysis. Method: Using passive sign law, differential equations govern behav...

Enriched environments are known to boost physical and mental health in rodents and humans. Now, Cao et al. (2010) report that environmental enrichment also suppresses tumor growth in mice by stimulating the hypothalamus to produce brain-derived neurotrophic factor that acts on the sympathetic nervous system to reduce leptin production in white fat tissue.

A dual goal for treating Alzheimer's disease (AD) is to decrease deposition of neurotoxic amyloid beta-peptide in the brain and to boost repair of damaged neurons. Donmez et al. (2010) now show that SIRT1 may mediate both processes by deacetylating the transcription factor retinoic acid receptor beta, a potential new therapeutic target for AD.

This paper presents and implements a single-stage high-power-factor light-emitting diode (LED) driver with coupled inductors, suitable for streetlight applications. The presented LED driver integrates an interleaved buck-boost power factor correction (PFC) converter with coupled inductors and a half-bridge-type series-resonant converter cascaded with a full-bridge rectifier into a single-stage ...