The electronic band structures, density of states and magnetic parameters for layer structural Zn_0.5Mn_0.5Se in ferromagnetic ( F) phase have been calculated, using self-consistent linearized muffin-tin orbital method in atomic sphere approximation (LMTOASA). The p-d repulsion model is used to explain the band structure and distribution of density of states (DOS). The antiferromagnetic band structure is qualitatively analysed for this material in terms of p-d repulsion mechanism.

The techniques of the laser light scattering and the flow visualization are used to study the bifurcations and chaos in a circular Couette system. Two different routes to turbulence are observed. A physical understanding of the results is given based on the nonlinear interaction.

Three routes to chaos in a DC discharge plasma under different initial conditions are reported. It is shown that these chaotic phenomena come from the self-oscillation of plasma and the plasma sheaths have contribution to this instability especially in negative space potential.

The first experiments on the head-on collision of Electron Plasma Waves (EPW) and ion acoustic solitons have been performed in a multipole plasma device. It has been observed that frequency of EPW increases during the interaction.

The electron hologram of a static microfield is obtained in JEM-200CX type electron microscope, using as Möllenstedt electron static biprism as beam splitter. Recontruction of this hologram by a M-Z interferometer gives the equal potential lines of the microfield.

By using the principle of detailed balance, the thermonuclear reaction rates for the ²⁸Si (α , p ) ³¹p reaction were evaluated from the ³¹p ( p ,α ) ²⁸Si resonance parameters. The reaction rates vary from 1.75x10^-1 to 1.08 x10⁴ in the region T₉=2-5, which agree with the theoretical predictions.

Takagi's equation is modified using a new of approximation. It is generally the case that the perturbation of polarizability is not zero: h(r)≠0. When the crystal is perfect or distorted uniformly, h(r)=0.

The static and dynamical characters of the wall in nematics at the magnetic field above the Fredericks transition have been investigated experimentally. The dependence of the width, the speed and the relaxation time of the wall on the reduced magnetic field were measured. The linear dependence of the speed of the wall on the tilt angle of the magnetic field was also revealed.

The experimental observations about the complex nonlinear behavior of spontaneous pulsing of dc biased, p-i-n diodes RC circuits are reported. Time intervals series between successive pulses in spike trains were analyzed. Transitions from quasiperiodicity into chaos via mode-locking were observed. The phase portrait is analyzed to reveal that the system is really characterized by a strange attractor. Finally, the embedding algorithm has applied to determine the fractal dimension of the attractor.

Using X-ray precession method, it is found that the distribution of reciprocal lattice of β-W structure is lust the distortion of the reciprocal space of A1₆Li₃Cu quasicrystal structure. Except the distortion, the X-ray diffraction patterns along 5-fold, 3-fold and 2-fold axes can be observed. Their angular relations satisfy well with those of the perfect icosahedral symmetry; and all the diffraction spots can be indexed approxmately to be six-dimension and strictly in three-dimension.

In molecular simulation of LiCl glass, it is observed that the peak of the radial distribution splits into two subpeaks in the temperature range from 498K to 298K. The diffusion coefficients of Li⁺ and C1^- ions at 498K are 7 and 4 times greater than those at 298K respectively. It is shown that cavities present in the simulated fluids. The dependence of the properties of the cavity on the temperature is studied. It is clear that when the fluid is quenched into a glass, the cavity structure of the parent fluid is frozen in also.

A new method in calorimetry for superhigh energy hadrons is proposed. The main feature of the method is the effective detection of soft neutrons, abundantly present in the superhigh energy hadron showers, by using neutron detectors insensitive to minimum ionizing particles. Such a calorimeter allows us to selectively detect the hadrons in the environment of high backgrounds of electrons, photons and muons.