Nonlocality Property of Three—Mode Correlated Fields

Four three-mode correlated states are generated by two beam splitters.We show that,by means of parity measurement,those light fields exhibit the nonlocality represented by the violation of the Bell inequality.The conditions fo the maximum violation are also studied.     

A New Method for the Raman Spectra Calculation of Vitreous or Molten Silicate

A new method is deduced to calculated the Raman spectra of vitreous or molten silicate.This method includes five steps:(i) molecular dynamics simulation to generate thousands of vitreous or molten configurations in equilibrium;(ii)decomposing the configurations into five kinds of defined tetrahedral units;(iii) normal vibrational analysis with Wilson‘s GF matrix method for the eigenfrequencies and eigenvectors of each tetrahedral unit;(iV) Raman intensity calculations for each vibrational mode by utilizing the electro-optical parameter method and bond polarizability model;(v)accumulating the data of frequencies and corresponding intensities to form the prtial Raman spectral line of each defined tetrahedral unit and finally the envelope.     

Theoretical Study of the Opacity for Mixture Materials at High Temperatures

Using a detailed configuration accounting model with term structures treated by the umresolved transition array model,we have extensively investigated the opacitiesof mixture materials.For plasmas at the temperature of 250 eV and density of 1 g/cm^3,our calculated Rosseland mean opacities are in good agreement with other theoretical results.A high increase in the Rosseland mean opacity to 2944cm^2/g is achieved for a multi-element mixture compared to the value of 1729cm^2/g for pure gold.Various mixtures at other plasma conditions are also studied.     

Monitoring the Aggregation of Dansyl Chloride in Acetone through Fluorescence Measurements

The aggregation of dansyl chloride (DNS-Cl) in acetone has been studied in detail by steady-state fluorescence techniques.It has been demonstrated that DNS-Cl is stable in acetone during purification and aggregation study processes.The aggregates are not solvolyzed in acetone,and do not take part n any chemical reactions either.It has been found that DNS-Cl tends to aggregate even when its concentration is much lower than its solubility in acetone.The aggregation is reversible,and both the aggregation and the deaggregation are very slow processes.Introduction of SDS has a positive effect upon the formation and stabilization of the aggregates.     

A Novel Contactless Method for Characterization of Semiconductors：Surface Electron Bean Induced Voltage in Scanning Electron Microscopy

We present a novel contactless and nondestructive method called the surface electron beam induced voltage (SEBIV) method for characterizing semiconductor materials and devices.The SEBIV method is based on the detection of the surface potential induced by electron beams of scanning electron microscopy (SEM).The core part of the SEBIV detection set-up is a circular metal detector placed above the sample surface.The capacitance between the circular detector and whole surface of the sample is estimated to be about 0.64pf.It is large enough for the detection of the induced surface potential.The irradiation mode of electron beam (e-beam) influences the signal generation When the e-beam irradiates on the surface of semiconductors continuously,a differential signal is obtained.The real distribution of surface potentials can be obtained when a pulsed e-beam with a fixed frequency is used for irradiation and a lock-in amplifier is employed for detection.The polarity of induced potential depends on the structure of potential barriers and surface states of samples.The contrast of SEBIV images in SEM changes with irradiation time and e-beam intensity.     

二阶非线性微分方程的斜周期边值问题

In this paper a uniqueness theorem for a skewperiodic boundary value problem is obtained. By using the optimal control method, we derive the best estimate for the integration mean ensuring that the results hold.     

Can Quintessence Be the Rolling Tachyon？

In the light of the recent works by Sen(hep-th/o203211,hep-th/0203265,hep-th/0204143)and Gibbons(hepth/0204008),we present a phase-plane analysis on the cosmology containing a rolling tachyon field in a potential resulting from string theory.we show that there is no stable point on the phase-plane,which indicates that there is a coincidence problem if we consider the tachyon as a candidate for quintessence.Furthermore,we also analyse the phase-plane of the cosmology cotaining a rolling tachyon field for an exactly solvable toy potential in which the critical point is stable.Therefore,it is possible for the rolling tachyon to be a candidate for quintessence if we give up the strict constraint on the potential or find a more appropriate effective potential for the tachyon from M/String theory.     

Fabrication of Intrinsic Josephson Junctions on BI2Sr2CaCu2O8＋δ Single Crystals with Reproducible Surface Junctions

Intrinsic Josephson junctions on Bi2Sr2CaCu2O8 δ single crystals are successfully fabricated using photolithography and Ar jon milling .Here we discuss the properties of the surface CuO2/metal bilayers and surface junctions prepared with different crystal cleavage conditions and metal film deposition techniques.We show that,by cleaving the crystal at liquid nitrogen temperature in vacuum,the contents of the (interstitial) oxygen in the Bi-O layers become stable upon cleavage,leading to a CuO2/metal bilayer and to surface junctions with reproducible properites,These results can be useful for practical device fabrications as well as for the studies of the contact properties between high Tc superconductors and normal metals.     

关于“长阵方程AXB＋CYD＝E的通解”的注记

文[1]利用矩阵的加逆给出了矩阵方程AXB＋CYD＝E解的相容性，唯一性及通解，本文指出，文[1]的结果可利用矩阵的减号逆写得更一般些，而且纠正了文[1]的几处错误。     

运用多种教学方式方法提高《法律基础》课教学效果

在《法律基础》课的教学中，以“以案说法”的启发式教学为主导，综合运用案例分析、学生演讲、学生讲课、电化教学等多种教学方式方法，并在考试出题方式上注重考学生的理解分析能力，较好地克服了传统的、单一的教学方式方法的弊端，提高了教学效果。