Somnath Maity

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SUMMARY We propose a method of estimating the fast-scale stability margin of dc–dc converters based on Filippov's theory—originally developed for mechanical systems with impacts and stick-slip motion. In this method one calculates the state transition matrix over a complete clock cycle, and the eigenvalues of this matrix indicate the stability margin.(More)
The aim of the present study is to prepare and evaluate mucoadhesive nasal gels of venlafaxine hydrochloride. Mucoadhesive nasal gels were prepared using polymers like carbopol 934 and sodium alginate and characterized in terms of viscosity, texture profile analysis, ex vivo drug permeation profiles and histopathological studies. The results show that(More)
— Nonlinear phenomena in closed-loop pulsewidth modulation (PWM) dc/dc converters have been reported recently. In this paper, we investigate experimentally these phenomena in a voltage-mode controlled buck converter operating in continuous-conduction mode. In particular, the complex behavior of a voltage feedback buck converter is studied for wide variation(More)
OBJECTIVES Lafutidine is a new H2-blocker in India claimed to be more potent and effective than existing H2-blockers. Proton pump inhibitors (PPIs), by virtue of their mechanism of action, have greater efficacy than H2-blockers in gastric acid suppression. However, clinical trials comparing H2-blockers directly with PPIs are limited. We carried out a(More)
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