浅谈油田开发钕铁硼永磁体温度和环境对其性能的影响

本文简述了工作温度和环境对油田开发用钕铁硼永磁体磁性能的影响，并探讨了改善钕铁硼永磁体耐热、耐蚀性的方法。     

南京电子工业发展战略研究

南京电子工业发展战略研究范汾涤，沐志成，徐士钰，许金龙，张文炽一、南京电子工业发展现状南京素以“电子城”著称。作为南京的一大优势，其生产规模、产品水平、科技开发能力均在全国居领先地位。以１９９２年为例，在全国３７个中心城市（不包括３个直辖市）中，南京...     

Brick Walls for Nonstationary Black Holes

The validity condition of the brick-wall model is analysed in nonstationary space-time.It is shown that the model holds only in thin regions,only by using tortoise coordinates near the event horizon of a slowly varying(quasistationary)black hole.The reason for the use of tortoise cooridnates is that the stationary state solutions of quantum field equations in other coordinates do not exist for any region in nonstationary space-time.Meanwhile,the quantum corrections to the entropy of the Vaidya-Bonner black hole due to the spin fields are calculated in terms of the brick-wall model.     

大型爆轰实验示波器组群控制系统

针对爆轰实验中示波器的应用特点，介绍大型爆轰实验示波器组群控制系统。分析了基于GPIB接口的示波器组群的硬件连接方式，控制软件的组成，示波器的实验过程控制方式，数据存储格式和示波器组群控制系统的安全措施。     

D—Wave Kondo Problem in a Square Tight—Bounding Lattice

A Kondo model in a square tight-bonding lattice of conduction electrons is considered.The Kondo interaction takes a d-wave.Using mean-field theory and numerical simulations,it is found that there is a pseudo-gap for the impurity density of states at the Fermi level.Numerical results also show that the exponents of the lowtemperature thermodynamic quantities are non-universal but dependent on the interaction.     

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.