We combine the Freund-Rubin (FR) type ansatz with the nonlinear sigma model, a new solution of the chiral N=2, D=10 supergravity compactified on manifold M⁴ x N⁴ x H² is obtained. Its properties are discussed.

We analyzed the SU(2)x SU(2) chiral model with mixed fundamental-adjoint action on the 2-dimensional(2-D) random lattice by using Monte-Carlo (M-C) simulation. The results show that the model behaves like the mixed SU(2)xSU(2) chiral model on the 2–D regular lattice, but the character of the phase transition seems to be different.

In the case of k=l, √s ≥√s₀ =l.847x10⁸x (l ± 0.397)Gev and at the constant temperature and volume, the overage particle number in each fire-ball n and the rapidity y can be related to the following equation 1/n.dn/dy=1/ch²y. (3)/F(Mc²/k_BT).exp(-Mc²/k_BT.chy)[1+ Mc²/k_BT.chy+1/2(Mc²/k_BT.chy)²] and in the inelastic case where √s ≥√s₀ , the cross section σ_in ~ constant.

By studying the relative excitation curve of ¹¹B ( p , α₀ ) ⁸Be , we found that there is a wide platform (～100KeV) near the E_p=2.62Me V peak, which can be used to profile boron. A brief comparison between the new method and that of ¹¹B ( p , α₁ ) ⁸Be* reaction has been given.

The collinear fast ion beam-laser spectroscopy has been used to measure the radiative lifetime of the (23537)°_9/2 level of the rare earth ions NdII. The measurement was carried out by the interaction between the 30keV NdII ion beam and tunable collinear dye laser which resonantly excited a metastable level to the (23537)°_9/2 level, and by the observation of its time-resolved decay downstream. The lifetime value obtained from a fit program was 27.6±0.9ns . The result may provide a possibility of determining the unknown configuration of the (23537)°_9/2 level.

There are three channels of excitation in collisions between Ar²⁺ and Ne or He, the first is double-electron capture into excited states, the second is single-electron capture into excited states and the third is direct excitation of target by the impact of incident ion. The emission cross sections of ArI, ArII, NeI, NeII, HeI and HeII lines have been obtained and compared. The emission cross sections of Ar²⁺ +Ne collision system is much larger than that of Ar²⁺ +He collision system.

Implantation 150keV carbon ions into pure nickel to a dose of 2 x 10¹⁷ ions / cm² produced a multiple-layer structure in the implanted region. This multiple-layer consists of amorphous, Ni₃C and some other metastable phases.

The solid state reaction of Ni₅₀Ti₅₀ multilayer under high pressure was carried out to investigate the effect of pressure on the amorphization process. Under the pressure of 20kbars amorphization reaction could not occur at 250°C while amorphous phase formed by isothermal annealing at same temperature in vacuum as well as lower pressure. It is suggested that the effect of pressure on diffusion played a predominant role, and Ni atom should diffuse into Ti layers with vacancy mechanism rather than interstitial one.

The thermoelectric power S of a superconducting Bi₂Sr₂CaCu₂O_x crystal has been measured from 77K to 290K, and obvious anisotropy has been observed. The values of S in a-b plane are negative and small, and S in c-axis are positive. If the semiconductor-like behavior of R(T) is intrinsic in c direction, supposing the existence of metallic links between Cu-O planes caused by defects in crystal, the behaviors of S(T) and R(T) in c direction of our sample could be understood.

The photoinduced defect absorption in a-Si:H excited by bandgap light was studied. Energy position of light-induced metastable defects is different from that of native dangling bonds.

By employing a gettered annealing technique, we studied the relationship between the resistivity ρ(x, T) (20°C≤ T≤ 30°C) and oxygen content in the high-T_c superconductor YBa₂Cu₃O_7-x. ρ(x, T) is approximately linear for 0.0≤ x ≤0.6, and both the slope dρ/dT and the residual resistivity increase continuously decreasing oxygen content. A qualitative analysis is given.

The magnetocrystalline anisotropy of SmTiFe₁₁ has been studied. In addition to experimental investigations, the contribution of Sm³⁺ ion to the magnetocrystalline aniso-tropy of SmTiFe₁₁ has been calculated using the single ion theory. The effect of the first excited state of Sm³⁺ has been taken into consideration in the calculations, and the calculated results are consistent with the experimental data.