The properties of the O++ scalar glueball is investigated in the fremework of the quantum chromodynamics finite energy sum rules. The mass and width of such glueball are predicted to be 0.62GeV and 62Mev respectively. The effect of non-vanishing quark masses turns out to be not negligible.

We compute the electric dipole moment generated at two-loop for the W-boson in the Weinberg-Higgs model in which the CP violation is mediated by neutral Higgs-boson exchange. We also compare our results with the others relative to the problem in the literature

Observation of the dynamics in a single-mode Ar⁺ composite resonator laser using KNSBN;Cu crystal self-pumped phase-conjugator is reported. The sequence of instabilities occurring on gain change corresponds to the transition the chaos of the logistic equation. Period-doubling route to chaos, and period-5, -3,-3×2, and -2 together with -3 windows in the chaotic range were observed. The strange attractor which is similar to that of the forced Duffing equation is obtained by reconstructing phase-space pictures of the system.

A degenerate four-wave mixing experiment with the solutions of some dyes has been performed using 10ns pulses at 530nm. Large resonant and off-resonant third order hyperpolarizabilities were obtained.

We present "convection-nonequilibrium cross relaxation" model for a gas flow and chemical lasers, Teh experessions of the saturated gain spectrum are obtained for the two-type flow models with layer or turbulent flow mixture respectively. The numerical results show that the gain profile of a saturated amplifier with Doppler-broadening is a mixture of inhomogeneous and homogeneous profiles

The linear eigenstate problem of generalized magnetohydrodynamics(MHD) equations in a cylindrical plasma is discussed. The effects of finite frequency and finite pressure perturbation lead to an important result: the resonant layer of the shear Alfven waves is not a singular layer. In this paper, the MHD equations are reduced to four differential equations of first order for perturbed quantities. An analytical dispersion relation for a homogeneous plasma cylinder is obtained. The K. Appert theory is a limiting case of our theory

By using a Q-switched YAG Laser and a optical path delay set-up, we study the process in whith a laser induces breakdown to produce plasma in air, and obtain time-resolved Mach-Zehnder interferograms and optical shadowgrams of the initial stage of the plasma and the expansion wave produced in the process for the first time

A simple model is used to evaluate the phonon frequencies in both ground and excited state for polydiacetylene. The spring constants K^σ_i in the σ-bond skeleton are distinct from the experimental effective spring constants K_i. The results are compared with experimental date.

The optical-phonon deformation potentials of C, Si, Ge and Sn are calculated by LMTO-ASA approach within the frozen-phonon approximation. The comparisons between our results and those of several present theoretical calculations and experiments demonstrate that our calculation model is reasonable

We measured the time decay of the magnetic moment of high T_c superconductors YBa₂Cu₃O_7-δ ceramic samples and found the memory effect which has hitherto been reported only in single crystals. The temperature and field ranges, especially the memory phenomenon in ceramic samples at liquid nitrogen temperature can only be understood in a combined picture of both flux creep and glass behaviour

With iodine vapour treatment of various single crystals of Bi-Sr-Ca-Ln(Rare earch element)-Cu-O system, the stage-1 iodine-intercalation compounds of Bi₂(Sr,Nd)₂CuO_y(2201), Bi₂Sr₂(Ca,Gd)Cu₂O_y or Bi₂Sr₂CaCu₂O_y(2212) and Bi₈SrCaO₁₄ have been prepared. x-ray diffraction and transmission electron microscope analysis indicate that iodine layer of thickness 3.2～3.5Å is formed between two Bi₂-O₂

The wave equation of nonlinear magnetostatic surface waves (MSSW) on ferromagnetic films is derived and its solution is found. The nonlinear dispersion relation of MSSW in discussed. Our Result shows that the wave power has a little effect to the frequency shift of MSSW with lower frequency, but has a considerably larger effect to that with higher frequency within the band.

For longer heat treatment duration(10 and 30 min), near and within the transition region, the softening fraction ρ has an obvious, but not very large increase and the increment for 30 min is greater than that for 10 min. As a result, the critical temperature T₀ is only lowered by 2～3°C for a typical sample. The above results indicate the existence of a quasi-static athermal instability, and the thermal activation of Bloch points is only of secondary importance.

One of the most common and prominent optical features of high temperture supeconductors is the quadratic frequence of the loss function, i.e., Im(-1/ε)=βω², for ħω ≤1eV.We show that the nesting Fermi liquid (NFL) theory can quantitatively account for the low frequency(<0.5eV) behavior, but it can not explain the higher frequency behavior. This suggests that the form of relaxation rate derived from the NFL is inadequate to describe the high frequency behavior in high temperature superconductors

Multilayers consisting of bilayer alternation of hemicyanine dye and cadmium stearate have been prepared by the Langmuir-Blodgett technique. x-ray diffraction and optical absorption spectra are used to characterize their periodic structures and optical properties. The results show that a well ordered supperlattic is produced and the hemicyanine dye is in non-aggregated formation in the alternating multilayers.