An improved defect model has been proposed by combination of the defect model with the Bardeen model. The predictions based on this model can qualitatively explain the experimental results of the Schottky barrier formation on GaAs(110).

The defects, whose structures are well known (for example, the complex ofoxygen and vacancy-A center), were introduced in the p+n junction samples with diffused Pd by irradiation of electrons, and their interaction was promoted by annealing. The existance of the energy level related to Pd in Si can lower the annealing temperature of A centers, but does not affect its generating rate. The level ETC related to Pd is the complex of the interstitial Pd and vacancy.

A new technique of photoacoustic spectroscopy measurements of the absolute fluorescence quantum yields has been investigated and used in laser dye solutions. The fluorescence quenchers is used in the experiment. Five home-made dyes, Rhodamine 6G, Disodium Fluorescein, Eosin Y, Cuomarin I and Quinine Bisulphate, have been measured. The results are in excellent agreement with those reported.

It is argued that the nondiffractive hadronic processes are stochastic in nature both in the transverse and in the longitudinal directions. The calculated results agree well with the experimental data up to the pp collider (SPS) energy.

The ionization of magnesium vapor by resonant and off-resonant laser irradiation was investigated for the first time. Enhancement of ion signals was observed at the 3s²-3s4d ¹D and 3s²-3s5s ¹s two-photon atomic resonances. A "hybrid resonance" was detected which involves the production of 3s3p ¹P atoms from molecular magnesium. Doubly charged ions by laser radiation tuned to one and two-photon resonance levels of MgII were produced

The induced magnetic ordering effect of polycrystalline dhcp Pr at low temperature was applied to discriminate the minute Pr phase in Pr-Fe-B alloys with high sensitivity. The conclusion that the composition range of HM phase of Pr-Fe-B is very narrow has been deduced from experiments.

The structure of icosahedral quasicrystal in rapidly quenched Al-Mn alloy has been studied by electron diffraction and high resolution electron microscopy. A structure model is proposed and neighboring interatomic distances are given.

It is proved that in Taub's and Kar's plane-symmetric spacetime, a future directed null geodesic emanating from a point “p”will enter the chronological future of “p”. Physically, this implies that the light signal from a movie projector with its back to the screen will finally come back to the screen and form a movie which looks exactly the same as the true one.

K_o-image of the Brazil twin boundary in quartz crystal by X-ray section topography and the same contrasts of the f irst fringes for entrance and exit surface are shown in this paper.

The effect of the change of the pion field in nuclei on the confinement radius of the nucleon is calculated. The nucleon size increase in a nucleus is about 3%. Combining with the change of the vacuum properties, the reasonable fit for EMC effect has been obtained.

Within DWIA formalism, we calculate the η production cross sections from nuclear target by charge exchange reaction A(π+,η)B . For ₁₃C target the cross sections at forward angles are of the order of 10 ηb/sr at T_π =660MeV, which can be measured experimentally. The high momentum component of the wave function of single particle bound state is essential for describing this reaction.

It is proved that the photon-scattering term in Hamiltonian of Dicke problem would cause the additional squeezing effect .