0

This paper introduces a new soft switching boost converter with passive snubber. In the proposed converter, the main switch turns on under zero current switching (ZCS) and turns off under zero voltage switching (ZVS) without any additional voltage or current stresses. The main diode turns on under ZVS and turns off under ZCS. The proposed converter has features as low cost, simple control, low ...

The massive neutrino radiative decay νi → νjγ (i 6= j) is investigated within the Minimal Quark-Lepton Symmetry of the Pati-Salam type based on the SU(4)V ×SU(2)L×GR group in an external constant crossed field (~ E ⊥ ~ H, E = H). The matrix element ∆M (X) and the decay probability W (X) due to the leptoquark X contribution are analysed. The effect of significant enhancement of the neutrino deca...

We present the leading order differential and total rates for J/ψ production at LEP. By leading order we mean all terms of the form αs[αs log(M 2 Z/M 2 ψ)] n and αn+1 s log (z2) log(M2 Z/M 2 ψ), (l +m = 2n − 1), in the regions z = 2Eψ/MZ ∼ O(1) and z ≪ 1, respectively. In the intermediate region we interpolate using the available data. This resummation eliminates the O[αs(Mψ)/αs(MZ)] ∼ 2 theore...

I discuss the construction of realistic superstring standard–like models in the four dimensional free fermionic formulation. I discuss the massless spectrum of the superstring standard–like models and the texture of fermion mass matrices. These models suggest an explanation for the top quark mass hierarchy. At the cubic level of the superpotential only the top quark get a mass term. The lighter...

The worldwide demand for green energy systems is evident. In this context, wind energy converters will play a paramount role. Extending the service life of a wind energy converter translates into significant economic savings as well as ecological earnings. New opportunities for the management and operation of the wind energy converters make it beneficial to know the structural condition and the...

%e explore possible muon-number-nonconserving processes in gauge theories in which the right-handed muon and electron appear along with neutral heavy leptons in SU(2) U(1) doublets. The same mechanism which gives a mass to the electron and muon is expected to mix the left-handed neutral leptons with the neutrinos. In the simplest case, this leads to a rate for p, ~ey 25 times larger than previo...

A detailed CAD model needs manual clean-up, or simplifying operations, before a finite element mesh can be automatically generated because such a model consists of hundreds or thousands of faces many of which may be smaller than a desired mesh element size. We propose an automated face clustering method used as a pre-process of surface mesh generation. By decomposing a model into face clusters ...

In this analysis energy inputs to crop production, emphasizing corn or maize, is compared for a series of agricultural systems of increasing complexity. Solar energy captured in corn yield is 2 to 8 times higher under intensive modern management systems than in hand or animal powered systems. The ratio of energy output to energy input is 2.14 to 1 for a modern tractor system and decreases to 0....

A main issue in nonstationary, compressible magnetohydrodynamic (MHD) simulations is controlling the divergence of the magnetic flux. This paper presents a general procedure showing how to modify the intercell fluxes in a conservative MHD finite volume code such that the scheme becomes locally divergence preserving. That is, a certain discrete divergence operator vanishes exactly during the ent...