b Blockers have been shown to reverse left ventricular remodelling (LVR) and to reduce the severity of functional mitral regurgitation (FMR) in patients with chronic systolic heart failure. It is unclear, however, to what extent the beneficial effects of b blockers on LVR or FMR are influenced by the severity of left ventricular dilatation or FMR at the time of commencement of b blocker treatme...

The largest volume ratio of a given convex body $K \subset \mathbb R^n$ is defined as $$ \mathrm{lvr}(K):= \mathrm {sup}\_{L R^n} {vr}(K,L), where the sup runs over all bodies $L$. We prove following sharp lower bound: c \sqrt{n} \leq \mathrm{lvr}(K), for every $K$ (where $c > 0$ an absolute constant). This result improves former best known bound, order $\sqrt{{n}/{\log \log(n)}}$. also study e...

Penetration of equipment such as photovoltaic power generations (PV), heat pump water heaters (HP), and electric vehicles (EV) introduces voltage unbalance issues in distribution systems. Controlling PV energy storage system (ESS) outputs or coordinated EV charging are investigated for compensation. However, some exist, dependency on installed capacity fairness among consumers. Therefore, the i...

This application note describes power-management schemes for portable applications with fourand three-cell battery systems. Optimal designs and uses for step-up/down converters, linear regulators, voltage converters, charge pumps, and inductorless regulators are shown. Several Maxim power-management devices are featured. Numerous diverse and conflicting constraints burden the designer of small ...

Title of Document: AN ULTRA-LOW POWER VOLTAGE REGULATOR SYSTEM FOR WIRELESS SENSOR NETWORKS POWERED BY ENERGY HARVESTING Chao Wang, Doctor of Philosophy, 2014 Directed By: Professor Martin Peckerar Department of Electrical and Computer Engineering A DC-DC converter is an important power management module as it converts one DC voltage level to another suitable for powering a desired electronic s...

Static voltage stability is considered as one of the main issues for primary identification before voltage collapsing in distribution systems. Although, the optimum siting of distributed generation resources in distribution electricity network can play a significant role in voltage stability improving and losses reduction, the high penetration level of them can lead to reduction in the improvem...

Linear-assisted DC/DC converters are structures that allow to take advantages of the two classic alternatives in the design of power supply systems: Voltage linear regulators (classic NPN topology or LDO –low dropout–) and switching DC/DC converters. This paper shows the proposal of a modified current-mode one-cycle control for linear-assisted DC/DC converters. The modified current-mode onecycl...

With the expansion of introduction of renewable energy sources (RES) such as photovoltaics (PV), voltage fluctuations (fluctuated voltage by PV output ups and downs depending on sunshine changing) in distribution network can be increasing. As a method of suppressing voltage fluctuations, intensive control of voltage control equipment by the introduction of a centralized voltage control system (...

This paper attempts to list challenges and possible solutions for designing integrated voltage controlled oscillators (VCOs) in wireless products. Such challenges include oscillation frequency, frequency coverage, linearity of tuning curves, phase noise, power consumption, oscillation amplitude variations, sensitivity to process, supply voltage, and temperature variations (PVT), coupling to and...