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The properties of SU ( 1 , 1 ) , SU ( 2 ) , and SU ( 3 ) have often been used in quantum optics. In this Letter we make use of the symmetries of SU ( 2 ) and SU ( 2 , 1 ) . The group properties of SU ( 2 ) , and SU ( 2 , 1 ) are used to find the transition probabilities of time dependent...
We show that ageing of the silica sol in a closed vessel enhanced the open porosity of calcined mesoporous silica film studied by positron. Positron annihilation lifetime spectroscopy (PALS) based on a pulsed slow positron beam was used to estimate the mesopore size. 2-dimensional PALS (2D-PALS)...
In this Letter, a new control approach to synchronize a class of chaotic systems using the drive-response concept is presented. The proposed technique exploits adaptive observer design and Lyapunov stability theory. A remarkable feature of this approach is that, nonlinear terms are required to...
Chaotic maps can mimic random behavior in a quite impressive way. In particular, those possessing a generating partition can produce any symbolic sequence by properly choosing the initial state. We study in this Letter the ability of chaotic maps to generate order patterns and come to the...
In this Letter, we calculate the magnetostatic modes of a semi-infinite lateral ferromagnetic/ferromagnetic superlattice with the effective-medium theory and present the general features of the modes. The numerical calculations for Co/Ni superlattice show some interesting properties which...
Starting from an extended mapping method and a linear variable separation method, new families of variable separation solutions (including solitary wave solutions, periodic wave solutions and rational function solutions) with arbitrary functions for ( 2 + 1 )-dimensional...
Based on computerized symbolic computation, a complex hyperbolic-function method is proposed for the general nonlinear equations of mathematical physics in a unified way. In this method, we assume that exact solutions for a given general nonlinear equations be the superposition of different...
The absolute single electron detachment (SED) cross sections of carbon group elements C − , Si − , Ge − in the energy range of 0.05–0.29 a.u. (5 keV–30 keV) and oxygen group elements O − and S − 0.08–0.27 a.u. (5 keV–30 keV), incident on helium are measured with growth rate...
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