point symmetry
1.for Eu3+ ions in LaOX (X = Cl,Br,I) crystals for which the approximative point group symmetry is C4, have been calculated for the first time by making use of Angular Overlap Model(AOM). And the energy levels were fitted. The angulap overlar parameters obtained are listed in Table 2. From this we can see that the values of parameter e?
3.The variance of stress about particular points that situate on the edge where maximum stress point locates as the object function, we introduce complex method to optimize the position of exterior load point about pylon along the voyage direction and the angle between anti-swing stop and right-and-left symmetry plane about pylon under the determinate loads. We also compare the unoptimizable stress curves with the optimized to validate the feasibility and correctness of the optimization method.
4.Based on the Pocklington integral equation and Galerking method, the current distribution, the input impedance and the radiation pattern of the antenna by employing point matching method and the piece wise Dirac function as the expansionare got. In addition, the results with different angle of level symmetry antenna and wave-length are analyzed. The results obtained can provide the choices of antenna used on different needs of communication.
5.It has a high melting point(1420℃) and a high Debye temperature(320K). Te in the compcuud is in the from of Te+6 ion, with a structure having high coordination number and perfect cubic symmetry. As a substitute for ZnTe and SnTe sources, this source might be used for the Mossbauer measurements at room temperature.
7.The use of wave packet to analyze the dynamics of quantum mechanical systems is an increasingly important method to the study of the classical-quantum correspondence.Using the quantum Gaussian wave packet analysis method,we calculate the autocorrelation function of the rectangular billiard,the peak positions of the autocorrelation function match well with the periods of the classical periodic orbits,which show that the period of the classical orbits can be produced by the time-dependent quantum wave packet method.We also discuss wave packet revivals and fractional revivals in the rectangular billiard,the results show that there are exact revival for all wave packet at each revival time.We find additional cases of exact revivals with short revival times for zero-momentum wave packets initially located at special symmetry point inside the billiard.
