Aims CT calcium scoring (CTCS) and CT cardiac angiography (CTCA) are widely used in patients with stable chest pain to exclude significant coronary artery disease (CAD). We aimed to resolve uncertainty about the prevalence of obstructive coronary artery disease and long-term outcomes in patients with a zero-calcium score (ZCS). Methods and results Consecutive patients with stable cardiac symp...

With reference to a recently published paper, the realization of line and load regulation in switched-capacitor-based converters is discussed. We point out that achieving zero-current switching at the expense of losing line and load regulation is not practically feasible. In [1], a way of realizing zero-current-switching (ZCS) in step-up switched-capacitor (SC) converters has been presented. Th...

Multichannel resonant DC/DC converters have recently been popular in diverse fields, where multiple output voltage levels are required, such as supplying multilevel inverters. This paper is devoted to present the new member of a four-channel converter family, having consisted till now step down well step-up/down configurations. The capable realizing power flow amongst two input and four channel...

Light-emitting diode (LED) has the characteristics of environmental protection and energy saving, having become lighting source a new generation street-light lamps. The traditional two-stage power supply for providing an LED lamp is composed AC-DC converter with power-factor-correction (PFC) function at front stage DC-DC rear stage. large number electronic components costs, circuit efficiency n...

The need for high gain DC-DC converters has lately increased in tandem with the utilization of renewable energy supplies. Particularly appealing are that do not require inclusion extra power switches and/or other passive elements to system. As a result, this study proposes non-isolated single switch converter ultra-high voltage (UHG) is appropriate most conversion systems, like solar installati...

A high-efficiency power management unit (PMU) with wide dynamic range for radio frequency (RF) energy harvesting system is proposed in this paper. digital zero current switching (ZCS) and a maximum point tracking (MPPT) circuits are adopted. sub-threshold reference circuit subthreshold voltage detection to reduce the consumption of always-on control improve conversion efficiency at low input po...

To study cerebellar activity during learning, we made whole-cell recordings from larval zebrafish Purkinje cells while monitoring fictive swimming during associative conditioning. Fish learned to swim in response to visual stimulation preceding tactile stimulation of the tail. Learning was abolished by cerebellar ablation. All Purkinje cells showed task-related activity. Based on how many compl...