In this paper an efficient high step-up converter with a coupled- inductor with soft- switching operation is presented. The proposed topology includes a coupled-inductor boost converter for raising the voltage gain. Moreover, a simple auxiliary resonant circuit composed of an auxiliary switch, a clamping diode and a resonant tank (inductor, capacitor), is adopted in this paper. The coupled-indu...

This paper considers the turn-off robustness (the maximal current being able to be turned off) of high power IGBTs under over current condition. The analysis of turn-off curves shows that the turn-off robustness of the investigated devices is not really limited by the rate of voltage rise on collector-emitter (dVCE / dt ). The main reason of the robustness limitation is found out to be the rate...

Reactions carried out both in protic and aprotic water-miscible solvents can be affected by the presence of water. We have recently discovered that luminescence intensity a methanolic solution Tb(III) containing salicylic acid Tb�SA is highly sensitive to water content. The water-induced quenching was utilized for accurate measurement content methanol, ethanol, acetonitrile, tetrahydrofuran 0...

New anhydrous alkali lanthanide-free polyoxometalates have been elaborated by thermal decomposition of their parent hydrates, and they exhibit remarkable reversible turn-off-on luminescence properties at room temperature in the presence humidity.

In this investigation, the explicit expressions for reliability function and mean time to failure (MTTF) of a repairable system with provision of spares and removable multi-repair facility have been established. In removable repairmen strategy, the repairmen turn on when there are N or more than N failed units and turn-off when system is empty. The failure times of operating/spare units and rep...