Performance evaluation of antennas used in the a mobile radio channel is a non-trivial task because of the multipath propagation inherent to this type of channel. A useful measure of the performance of a given antenna is the mean effective gain (MEG) which is the mean received power relative to some reference. In this paper computation of the MEG is investigated based on measurements of the 3D ...

This paper concerns the micro-local and qualitative analysis of fractional Zener wave equation. The classical Gevrey-type front sets fundamental solution are determined, questions on dispersion, dissipation, propagation speed packet shape addressed.

Snow instability data provide information about the mechanical state of the snow cover and are essential for forecasting snow avalanches. So far, direct observations of instability (recent avalanches, shooting cracks or whumpf sounds) are complemented with field tests such as the rutschblock test, since no measurement method for instability exists. We propose a new approach based on snow mechan...

The interaction between cracks, as well their propagation, in single-crystal aluminum was simulated at the atomic scale by molecular dynamics method and modified embedded atom method. Further, effects of distance two cracks difference crack size on propagation mechanical properties were comprehensively investigated. results demonstrated that multi-crack is a quite complex process, which accompa...

We present a systematic study of the magnetization reversal nickel and permalloy micro-stripes with Neel Bloch domain walls using Kerr microscopy. Magnetic field driven propagation was observed from higher width to lower stripes for magnetic fields applied along length micro-stripes. Stripe like domains were nucleation starting in region followed by their regions The comparison N\'eel wall regi...

modelling of crack propagation by finite element method under mixed mode conditions is of prime importance in fracture mechanics. this paper describes an application of finite element method to the analysis of mixed mode crack growth in linear elastic fracture mechanics. crack growth process is simulated by an incremental crack-extension analysis based on the maximum principal stress criterion,...

Hypericum perforatum L. (St. Johns’ wort) is the most commercially important species of the genus Hypericum and contains a wide range of components including naphthodianthrones, phloroglucinols, tannins, xanthones, phenolic acids and essential oil. In order to establish an efficient protocol for regeneration, the effects of explant type and plant growth regulators on direct and indirect shoot r...