A new approach to threshold resonance calculation by the complex scaling method is discussed. Application to scattering over a model potential barrier is presented and compared to a direct quantum scattering calculation.

The time-dependent Schrödinger equation is a square-preserving and symplectic (SPS) transformation. The canonical equations of quantum systems are deduced by using eigenfunction expansion. The normal-square of wavefunction of the quantum systems is an invariant integral of the canonical equations and then the symplectic schemes that based on both Cayley transformation and diagonal Padé approximation to exp(x) are also square-preserving. The evaluated example show that the SPS approach is reasonable and effective for solving time-evolution of quantum system.

The leakage of iterations from chaotic attractor near crisis due to dynamical interaction between discontinuity and noninvertibility has been studied. The scaling law of the mean life time is derived analytically. The numerical result shows very good agreement.

The cumulant correlators and azimuthal correlations of particles produced in protonproton (PP) collisions at 400 GeV/c are investigated. The second-order cumulant correlators show that the two particle correlation length may be determined by comparing the experimental data with the Monte Carlo events sample which has same multiplicity distributions but no correlation. The azimuthal correlation has also been observed.

High spin states of the odd-odd ^l62Lu nucleus have been studied via ¹⁴⁷Sm(¹⁹F,4nγ) reaction at 95MeV beam energy. Level scheme for yrast band based on π [ h_11/2]v [i_13/2] quasiparticle configuration was established up to I^π = (23^-) for the first time. This band shows the signature inversion in energy before backbending generally appeared in this mass region. It is stressed that the signature splitting in ¹⁶²Lu is larger than that in ¹⁶⁰Tm nucleus.

It is pointed out that the infinite series of the tadpole contribution to the baryon self-energy can be summed rigorously and expressed in a simple form. The latter provides a new way for the calculation and explains more clearly the relation between Walecka's mean field theory and the tadpole diagrams.

Based on a relativistic hydrodynamic model, the dilepton production in a baryon-rich quark-gluon fireball is studied. We find that at invariant masses between 2m_π and 1 GeV, with increasing initial baryon density, a characteristic valley and a subsequent peak appear in the total dilepton yield, which signal more uniquely the baryon-rich quark-gluon matter formation and can be tested in future experiments at CERN and
Brookhaven.

The compact physical parameters (μ_α, U_iα) in multichannel quantum defect theory (MQDT) can be directly calculated with relativistic multichannel theory (RMCT). Here we report a systematic study of the MQDT parameters (μ_α, U_iα) with RMCT along the Ne-like iso-electronic sequence (including Ca¹⁰⁺, Fe¹⁶⁺, Ge²²⁺, Ag³⁷⁺ ions). We find that the physical parameters (μ_α, U_iα) show a very interesting scaling behavior along the iso-electronic sequence.

Even and odd phase coherent states associated with the Pegg-Barnett Hermitian phase theory are introduced. Even and odd coherent-state formalism of the Pegg-Barnett phase operator is given in terms of the projection operator in the even and odd coherent-state space. The number-phase uncertainty relation is investigated for these states.

Quantum cryptography is a new way to distribute keys, which can detect any eavesdropping. Quantum cryptography using single particle or weak light pulse has been discussed in some early papers, but it is difficult to transmit such single particle or weak light pulse. We propose a scheme of quantum key distribution using coherent State |α > and |α + Δα>. We also discuss its feasibility and security, and give an experimental realization of this scheme.

A self-excitation double pathway relaxation oscillation mechanism to deal with the self-pulsing output of upconversion laser with rare-earth ions as the active material is raised. The reabsorption of the laser signal, which causes self-excitation of system and two-pathway transition of system, plays a role of adjusting Q, and causes the oscillation output of laser. A qualitative analysis to the appearance of self-pulsing output of rare-earth-doped laser is given.

Chirped gratings with uniform Kerr nonlinearity are numerically demonstrated to have direction-dependent switching behavior, which is caused by the different energy storage between the two incident directions. This effect can find useful applications such as optical diode and optical switch-isolator.

Precipitation behaviors of Cu and Ni on Frank-type partial dislocations in Czochralski-grown silicon are investigated. It is found that Cu develops precipitate colonies in the region away from Frank partials and does not decorate Frank partials when the specimens are cooled slowly, while Ni decorates them although the concentration of Ni is lower than that of Cu in the specimens. The results indicate that Ni impurity is easier to decorate Frank partials than Cu impurity in Si.

A high-throughput Raman notch filter set has been manufactured and used to collect the Raman scattering signals of pressure-induced phase transitions of solid benzene in a diamond anvil cell up to 15 GPa at room temperature. The changes in the profiles as well as the frequencies of Raman scattering spectra are observed and enable us to determine the phase transition.

By using the variational method and the dielectric continuum model, we investigate the effect of electric field on the intrasubband scattering rates of electron-surface optical phonon. The results show that the scattering rates tend to increase with the electric field strength. These scattering rates become significant for wide quantum well wire and sufficiently high fields.

A new method to increase the luminance and quantum efficiency of polymer light emitting diodes with a lower threshold voltage has been reported. The threshold voltage, luminance and quantum efficiency have been significantly improved by doping certain dopants with a lower highest occupied molecular orbital (HOMO) level into the hole transporting layer. A high performance device has been achieved by addition of the perylene and triphenylamine as a dopant into poly(N-vinylcarbazole). The luminance and quantum efficiency increase by 2-3 times in comparison with the undoped device, reaching 10000cd/m² in luminance and 0.58% in quantum efficiency, while threshold voltage is reduced to one half value. The energy diagram has been obtained by measuring the HOMO levels and band gap values. Based on this, the carriers injection and balance between electrons and holes as well as the action of dopant are discussed.

Carbon nitride films have been prepared by reactive sputtering using hollow cathode discharge. Auger spectra show that the nitrogen content is about 20-25at.% in the bulk. Infrared (IR) spectra display three broad absorption bands. After heating treatment, changes of IR spectra suggest that the nitrogen incorporating in the bonding network of amorphous is thermally stable and hydrogen content decreases.

The diffuse reflectance Fourier transform infrared spectra of the boron nitride (BN) films deposited on steels by remote microwave plasma chemical vapour deposition (CVD) from borazine with nitrogen, hydrogen and argon were investigated in the wavenumber range of 400-4000cm^-1. It was found that the cubic BN formation depends on production of the intermediate species of cyclotriborazane ((BH₂NH₂)₃) and its dehydrogenation. The structural bonds of cyclotriborazane are similar to that of cubic BN. Optimum conditions for deposited BN films were found to be the borazine-nitrogen mixture at the substrate temperature of 550°C. The BN films were a mixture of crystalline cubic BN accounting for the major content and hexagonal BN with relatively low hydrogen content.

Photoacoustic signals generated by nonradiative processes of photo-initiated chemical reactions in solutions have been detected by a laser heterodyne interferometer with high sensitivity and wide band. This technique can accurately carry out the time-resolved measurement of transient processes in nanosecond scale. The experimental results and theoretical calculations for probing some fast chemical reactions are described.

The elliptic loop equation of cosmic string is studied in the Minkowski space and during the radiation-dominated era in the Robertson- Walker universe. A remarkable fact about this equation is that a loop may never contract to one with a Schwarzschild radius, if it is sufficiently non-circular.