The manifestly SO(4.2) invariant equation of second rank anti-symmetric tensor field is got in 6-dimensional space with subsidiary conditions. These equations lead naturelly to conformally covariant field equation that we obtained in Minkowski space.

The projectile energy dependence of K-shell ionization probability have been measured across the narrow 5gesonance 2.522Mev with large ratio of U_k/Γ = 5.3 in the reaction ⁵⁶Fe(p, p ) ⁵⁶Fe . The frame work of the theory proposed by Blair and Anholt was introduced to analyze the results.

This paper reports the measurements of a new kind laser-induced collisional energy transfer ionization process in a K-Na vapour mixture. Theoretical analysis has been done by calculating the collision cross - section so different transfer processes as a function of detuning.

Under the near resonant radiation field-atom interaction in Na vapor, large population difference between 3²P_1/2 and 3²P_3/2 states was generated, then occurred the excited state stimulated Raman Scattering (ESSRS). By the sequential four-wave mixing (FWM)process, multi-line ESSRS and the buffer gas effect have been observed. A theory has been developed to explain the experimental results.

The problems of reflection and refraction when a compressional wave in porous medium is obliquely incident upon an interface between the porous medium and fluid are discussed. Numerical calculations for the amplitude ratios of the reflected and refracted waves to the incident one in a water-saturated porous structure of sintered glass beads are given.

A model incorporating (Cs-A-ABAB) stacking with Cs atoms chemisorbed in hollow sites 2.70A above the top graphite plane and the two top graphite layers shear-shifted to AA stacking and expanded to a separation of 3.85A is the most reliable structure for Cs/graphite( 0001)- (√3 X√3) surfaces. The coexisting diffraction pattern including the diffraction ring and another set of (√3 X√3 ) diffraction pattern which has a 30°rotation angle with respect to the normal (√3 X√3 ) R30°diffraction pattern could be explained. We consider.this structure to be in a pre-intercalation state.

Crystal defects, such as grain boundary, dislocation, stacking disorder, phase boundary and surface of granule were examined by high resolution electron microscope (HREM) in superconducting T1₂Ba₂Ca₂Cu₃O_x. Some possible effects of the defects on the sample's properties viz., Jc and Tc are discussed.

The NMR investigation on the stable T2 phase of Al-Cu-Li alloys as an interesting icosahedral phase is reported . ⁷Li NMR spectra and spin-lattice relaxation time at a magnetic field of 2.114T at several temperatures for samples of T2 phase and, for comparison, also of R phase and another typical A1-Li alloy were observed. The Li ions are situated firmly in the lattice sires with higher local symmetry in T2 and R phases.

A one-dimensional system with only off-diagonal disorder in which the absolute values of all the off-diagonal matrix elements are equal to a constant is studied with the renormalization group decimation method. It proves that all the eigenstates in the system are extended, regardless of the probability of the off-diagonal matrix elements being positive(or negative).

The absorption spectra and fluorescence spectra of La_1-xNd_xP₅O₁₄(LNPP) glass were studied. The fluorescence from the level of interest ⁴F_3/2(1) state shows an exponential decay and linear concentration quenching. Time resolved fluorescence line narrowing was observed for LNPP glass with different x values. For high x value LNPP glass, energy transfer between Nd³⁺ ions intraline was observed at low temperature.

The structural transition process of the superconducting phase in Bi_1-xPb_xSrCaCu₂O_y (x=0, 0.2 ) samples has been Investigated at temperatures ranging from -190°C to 800°C by means of electron diffraction . Two structural phase transitions have been found at the temperatures about 310°C and 490°C respectively for the BiSrCa₂O_y sample, and about 310°C and 470°C for the Bi_0.8 Pb_0.2 SrCa₂O_y sample. After these transitions a new structural phase forms.

Recently the "ground state" proposal for the wave function of the universe was of much interest , which incorporates the idea that the universe must come from nothing. In this paper we will discuss the quantum Kaluza-klein cosmology with coupling scalars field. We also give the Wheeler-Deritt equation and calculate the wave function of universe by using the Hartle—Hawking prescription.