We construct explicitly even and odd q-coherent states. These q-coherent states are introduced in terms of the q-functions defined in the paper. It is shown that the even and odd q-coherent states form a kind of representations of the q-deformed Heisenberg-Weyl algebra which is realized in the form of matrix q-differential operators in the even and odd q-coherent state space. We also analyse some different between the even and odd q-CSs and the usual even and odd CSs.

The usual fermion realizations of quantum algebra sl_q(2) defining higher-dimensional representations are built in this letter. Using them, we construct a usual fermion system with quantum group symmetry of sl_q(2) as a q-deformation of the pairing correlation model in many-body problems. Its energy spectra are exactly solved out from the representation theory of sl_q(2).

The ferrnion soliton stars suggested by Lee and Pang are extended to finite temperature. The degeneracy temperature T_D above which the fermion soliton star will become a Boltzmann soliton star is given. We prove that the Doltzmann soliton star cannot exist, because it is unstable.

The third-order correlation function G⁽³⁾ (0, T ) can be measured by using the method of noncollinear sum-frequency, by which the pulse-width of the ultr-ashort pulse light produced by modelocked laser is deduced to be 35ps. This result is the same as that by other standrd method.

Extensive new data on the even-parity autoionization Rydberg series of neutral-tin have been observed and identified by using two-photon resonant ionization laser spectroscopy and time-of-flight detection method. Observed autoionization Rydberg series are 5pnp(3/2,1/2)_1,2, 5pnp(3/2,3/2)_1,2,3, 5pnf3/2[5/2]_2,3, 5pnp3/2[7/2]_3,4, and 5pnf3/2[3/2]_1,2. The second ionization limit I₂ is obtained by fitting experimental data with the Rydberg formula. It is 63483.90±1.35cm^-1.

C₆₀-benzene solutions are used as a new type of nonlinear Medium for observing cw self-focusing of laser beams. Self-phase modulation of much low power laser beam has been observed. The response time of C₆₀-benzene solution has been measured.

Besed on the embedded atom method, molecular dynamics simulations have been performed on microdynamics behavior of liquid transition metal. Cu and Ni. Mean-square displacement, self-diffusion coefficient and velocity self-correlation function have been calculated. In addition, effects of many body interactions have been discussed.

By using x-ray diffraction technique and transmission electron microscopy the in situ growth property of metal crystal ultrafine particles(CUFP) which are deposited on the silica-substrates have been studied experimentially. It is found that the diffraction intensity and the nucleus diameter of Ag CUFP are grown with time by power-law. Thus, the changes of crystal nucleus and the structure of Ag CUFP with time shows a crystallization trend, at the same time, the in situ growth of Ag CUFP displays a self-similarity character.

9 The radiation damage induced by the reactor neutrons in body-centered-cubic metal Nb is simulated by the 81 MeV carbon irradiation to a total dose of 2.5x10¹⁶/cm². The created radiation damage and its thermal annealing behavior are studied by positron annihilation and perturbed angular correlation techniques. The results show the existence of both mono- and di-vacancies in Nb after the irradiation. Most of the defects caused by the radiation damage disappear after annealing around 960K. The radiation damage is completely annealed at 1058K.

Self-localized structures in nonlinear coupled pendulum lattices are investigated by use of the method of multiple-scales under quasi-discreteness approximation. The upper cutoff and noncutoff kinks observed by Denardo et al. recently are theoretically explained qualitatively and a lower cutoff standing soliton is also predicated.

Fe₇₅Cu₂₅ nano-multilayers were prepared by alternative deposition of pure Fe and Cu metals and then annealed in situ in transmission electron microscopy to investigate the structural phase transformation. A new phase was formed in the Fe-Cu multilayers by interdiffusion at 820°C for about I0min and was identified to be of fcc structure with a lattice parameter of 0.854±0.005nm.

In this paper, the flux pinning effects in Y_1-xM_xBa₂Cu₃O_7-δ(M=Gd, Eu and Sm) samples are reported. It is found that there is another pinning mechanism under higher magnetic fields in addition to that under lower fields. This pinning effect may stem from the lattice stress field resulting from the partial substitution of the rare earth elements with different atomic radii for Y.

We have developed a simple, novel cluster source with which intense beam of carbon and silver clusters were generated. The formation mechanism of the fullerene carbon clusters are discussed, and the velocity distribution of small carbon clusters was measured. The intensity distribution of silver clusters shows a distinct odd-even alternation, which agrees well with our previous theoretical predictions.

The semiclassical cosmological wave function in quantum cosmology of the Bergrnann-Wagoner scalar tensor gravitational theory is given in Vilenkin approach and Hartle-Hawking approach. The initial condition for inflation is given, we show there exists an extended inflationary phase in a hopeful particular model.