A kind of two-parameter correlated negative binomial state is constructed and analysed from the point of view of quantum optics theory in two-mode Fock space. By choosing a suitable two-mode correlated Holstein-Primakoff-analogue transformation, the state can be identified as a type of correlated SU (1,1) coherent state. The possible-physical uses of the state are also pointed out.

A bound state of the Schrödinger system is disturbed by an additional potential. It is shown that the system is still in a bound state if and only if its energy correction is restricted to the corresponding value. This infers some previous series solutions in quantum mechanics to be unbound states for the order i > 1 of perturbation. The corrected bound states of the system are given and their physical meaning is discussed simply. Application of the method to Stark effect reveals its advantage for researches of quantum chaos.

The possibility of evolving a partial degenerate solution from non-degenerate initial data in Ashtekar formalism is considered in a constructed example. It is found that this possibility could be realized in the time evolution given by Ashtekar's equations on a 3-dimensional manifold with topology R¹ × S².

A model-reference adaptive control strategy is proposed for a delay chaotic system with known or unknown parameters. Theoretical analysis and numerical simulations show that the controlled system state can track an arbitrarily given reference trajectory that may be an equilibrium point, a periodic orbit or a chaotic orbit.

Energy spectrum of yrast band for ¹²²Cs is studied by using particle-rotor model (PRM) of odd-odd nuclei, in which special attention is paid to the model basis accounting for the effect of the instability γ vibration perturbation around axial symmetry. In order to check the assignments of this band, two calculation schemes are put into practice. The first one is for previous πh_11/2 vg_7/2 configuration with bandhead spin I₀ = (6^-) which was obtained from cranked shell model (CSM) calculation, and the other one is for πh_11/2 vh_11/2 configuration with I₀ = (9⁺) supported by the systematic analyses of experimental data. A qualitative comparison between the present PRM calculation and that of CSM has also been made. The results indicate that, rather than πh_11/2 vg_7/2 I₀ = (6^-), πh_11/2 vh_11/2 with I₀ = (9⁺) is a more reasonable assignment to the yrast band in ¹²²Cs.

The influence of the relativistic finite volume effect of nucleons on the properties of dense nuclear matter is examined at finite temperature and it is found that the abnormal nuclear state can appear at sufficiently high density. Then, by using this methed the phase transition between hadronic matter and quark-gluon plasma is studied. The numerical results show that the value of nucleon radius is important for reproducing this phase transition correctly.

In-plane angular correlations between light charged particles and fragments with different charge number were measured in a ⁸⁴Kr+²⁷AI reaction at 8.5 MeV/n. An asymmetry in the angular correlation relative to the beam direction was found which cannot be explained in the fusion-fission reaction mechanism framework. This may imply the domination of deeply inelastic collisions over the complete fusion in the reaction.

By using the full core plus correlation method recently developed, the accurately analytical charge densities for the lithium-like systems (Z=3-8) are obtained. The convergence pattern of the charge densities is analyzed. The electron-nuclear cusp condition is calculated for these systems. Also, at the region far from the nucleus, the behavior of the electron density is examined. The present calculations show that the wave functions used in this work can give the satisfactory and self-consistent results in full configuration space.

The nodal structures of quantum states of three-body ABA systems composed of two identical fermions and another one with an opposite charge are investigated. We expand the wavefunction in the body frame and show that the effect of symmetry such as rotation, space inversion, and permutation is to impose nodal surfaces on the components of the wavefunction. Based on the nodal surface, a classification of quantum states of ABA systems is presented. It is found that the quantum symmetry plays a crucial role in determing the energy levels and structures of the low-lying states.

The fabrication process of glass master or glass etching optical disk using reactive ion beam (RIB) etching method was studied. Photoresist was applied for image reversal. RIB etching using CF₄ gas transferred the pregrooves into the glass substrate. The shape and depth of the pregrooves in the glass is a function of the RIB etcher settings. A glass substrate of Ф130mm with etched pregrooves (track pitch was 1.6 μm and groove depth 0.1 μm ) was obtained, showing that a glass master or glass etching disc can be fabricated by this technique.

The gain-noise model of a single-mode laser driven by correlated additive and multiplicative white noises is investigated theoretically. The analytical expressions of the time-dependent moments and correlation function of the laser intensity are derived by means of linear approximation method. Some novel phenomena are found. In certain cases, instead of monotonic evolution, the evolution curves of the intensity correlation function versus time exhibit the negative minimum value, whereas a peak for the evolution of the normalized variance of the laser intensity with time emerges.

Expressions of dispersion relation and propagation power are presented for the nonlinear transverse-electric (TE) waves in a two-core optical waveguide with a nonlinear cladding. The properties of the nonlinear TE waves are analyzed. It is found that when the total core thickness and the distance between the two cores are sufficiently large, the power curves of the higher odd modes become very sharp in some narrow ranges of the effective refractive index, compared with those of the higher even modes.

Essential difficulties caused by the nonvanishing boundary condition greatly hinder the development of the systematic perturbation theory for dark solitons. Recently a direct perturbation method for dark one-soliton is developed by the authors with rigorous proof of the completeness of squared Jost solutions. In this letter, influence of the self-steepening term is discussed analytically with the method.

The viscous fingering(VF) in a random Sierpinski carpet with bond radii of the truncated Rayleigh distribution has been investigated by means of successive over-relaxation techniques. A universal formulation of fractal dimension for VF in fractal space has been introduced. The topology and geometry of the porous media are found to have strong effects on displacement process. The fractal dimension D can be reasonably regarded as a useful parameter to evaluate the sweep efficiency and oil recovery.

A positive limiter biasing on the CT-6B tokamak resulted in a slight increase of edge density and an obvious drop of electron temperature, which is in the temperature range where the rate coefficients for ionization processes are strongly temperature dependent. Concomitantly, edge fluctuations are enhanced, suggesting that the presence of neutral particles may play an important role in modifying edge turbulence.

The time evolutions for the magnetic energy U_m, the magnetic helicity K, and the total helicity K_total with high pinch factor operation of reversed field pinch experiments on S WIP-RFP device are quantitatively calculated. It is shown that U_m and K increase with increasing plasma current but K_total decreases. The results are analyzed and valuable information for the operation is obtained.

The 4×10¹⁶ /cm² H⁺ and 9×10¹⁶/cm² He⁺ have been implanted into the silicon substrate of separation-by-implantation-of oxygen (SIMOX) wafers, respectively, followed by a 700°C annealing to form nanocavities beneath the buried oxide (BOX) layer. The SIMOX wafers were intentionally contaminated with Cu impurities by implanting different doses of Cu in the top Si layer. Secondary ion mass spectroscopy and cross-sectional transmission electron microscopy technologies have been employed to investigate the gettering effect of nanocavities to the Cu impurities. The cavities induced either by H⁺ or He⁺ implantation are effective gettering centers for Cu in SIMOX wafers. After annealing at 1000°C for 90 min, up to 4 ×10¹⁵ /cm² Cu has diffused through the BOX layer and been captured by the cavities. The gettering efficiency of cavities increases with the decrease of Cu implantation doses. The nanocavities provide an attractive method for gettering transition metal impurities in SIMOX materials.

A 10-InAs-island-layer vertically coupled quantum dot structure on (001) GaAs was grown and investigated by molecular beam epitaxy and transmission electron microscopy. The result shows that the vertically aligned InAs islands are asymmetrical along the two < 110 > directions on the (001) growth plane. Such an asymmetry in the vertically coupled quantum dot structure can be explained with the chemical polarity in the III-V compound semiconductors.

The thermal and chemical stabilities of Mo/Si multilayer structure used in Bragg-Fresnel optics were studied to get optimal technological parameters of pattern generation. Mo/Si multilayers were annealed at temperature ranging from 360 to 770 K, treated with acetone and 5‰ NaOH solution, and characterized by small-angle x-ray diffraction technique as well as x-ray photoelectron spectroscopy and Olympus microscopy.

The electronic structure of Y_1-xPr_xBa₂Cu₃O₇ is described by a tight-binding Hamiltonian in which the Pr-O hybridization and the 2p_σ - 2p_π Coulomb repulsion are taken into account. The dependence of planar hole-density, localized hole-density and chemical potential of holes on Pr concentration is calculated by a coherent potential approximation. The result shows that the insensitivity of hole-density on the CuO₃ chains with the Pr-doping is due to the 2p_σ - 2p_π repulsion. Some other experimental facts can also be well interpreted.

The valences of Cu in Y_1-xCa_xBa₂Cu₃O_6+y have been investigated by using complex chemical bond theory. The results for the valences of Cu(1) and Cu(2) in the calculation suggest that the holes introduced by calcium substitution only reside in CuO₂ planes, and there is a competition mechanism for the hole density in CuO₂ planes between Ca doping and oxygen depletion. These conclusions are satisfactorily in agreement with experiments.

La_2-xSr_xCu_l+yO₄(LSCO) thin films sputtered from a Cu-rich target on a LaAIO₃ substrate showed a columnar structure. The columnar grains penetrated the full thickness of the film, nucleating at the substrate surface defects. Transmission electron microscopy revealed two kinds of lattice images: one with a lattice spacing of 0.66 nm and the other with a spacing of 0.61 nm. The 0.66 nm spacing denotes a c-axis oriented LSCO film matrix. The 0.61 nm spacing has two categories: one with short white dashes, the phase of which is not yet identified, the other with no additional structure, which could correspond to the c-axis deviated LSCO.

A sequence of Ti_l-xAI_xN films has been prepared by rf reactive magnetron sputtering. The optical and electric properties versus aluminum content x have been studied. Values suitable for magneto-optic protective layers have been achieved in Ti_l-xAI_x N thin films with aluminum content x > 0.75. X-ray diffraction results show that Ti_l-xAI_x N thin films in this study are a bcc structure up to x = 0.75, further increase in the aluminum content gives a wurtzite structure. All of the results show that the optical and electric properties of Ti_l-xAI_x N films might be related to the crystal structure.

Nanometer-sized ZnFe₂O₄ particles capped with a layer of surfactant are synthesized and their optical absorption is investigated. Such capped ZnFe₂O₄ particles present a strong band edge absorption in visible region and their energy band gap is estimated to be about 1.53eV. It is also found that the capped nanoparticles have a significant red shift of optical absorption band edge in contrast with that of uncapped ZnFe₂O₄ nanoparticles, which is mainly related to the trapped and self-trapped excitons absorption resulting from an interfacial dipole layer formed on the surface of ZnFe₂O₄ nanoparticles.

The improvement of indium tin oxide (ITO) anode contact to organic electroluminescent devices via oxygen plama-treatment is investigated. Enhanced hole-injection efficiency improved the performance of organic light-emitting devices. The injection current increased by 1-2 orders of magnitude and the turn-on voltages droped several volts. Much higher injection current could be applied to achieve much higher brightness. Maximum brightness and luminous efficiency can reach to about 4000 cd/m² and 0.31m/W for the structure of ITO/TPD/Alq₃/Al, respectively.

Significant field emission has been observed from thin (< 1000 Å) amorphous-carbon-nitride (a-CN) films. X-ray photoelectron spectroscopy, infrared spectrometry, and UV-visible optical absorption spectrometry have been used to characterize the films. The field emission properties of the thin film have been studied by using a transparent anode imaging system. It is proposed that this class of films should be studied as candidates of coating material for cold cathode emitter, in order for one to benefit from their very high thermal conductivity and super hardness.

The conventional thermal instability criterion cannot be applied to the advection-dominated accretion disks around black holes where the radiative cooling is insufficient to balance the viscous heating. The surface density change associated with the temperature perturbations, which was usually neglected in deriving the conventional criterion, was recently shown to be much significant in the advection-dominated disks. Considering both advection and surface density change, a generalized thermal instability criterion is suggested. By applying it to the optically thin and optically thick advection-dominated disks, it is found that the former one is thermally stable and the latter one is thermally unstable against short wavelength perturbations, which agrees well to those found recently by both analytic and quantitative stability analyses.

The very long baseline interferometry result of a superluminal radio source PKS 0420-014 at 5 GHz with Shanghai (China), Urumqi (China), Noto (Italy), and HartRAO (South Africa) telescopes is presented. Proper motions of the relativistic jet components in the source are calculated. Based on the Self-Compton emission in a uniform spherical model, the beaming parameters of the source are estimated. The results show that PKS 0420-014 has a high Doppler factor of 9.3, a Lorentz factor of 6.5, and a small angle of 5.5^º to the line of sight.