HMO model of scalar field in vacuum

In this paper, the HMO model of scalar field in vacuum is developed using the covariant field theory, in which the so-called current density and mass density of optical fluid are obtained and analyzed.     

一种产生理想均匀磁场的经典电流分布结构的现代发展和应用

针对经典电动力学中“正弦分布表面电流可产生理想均匀磁场”这一概念，沿着技术发展的思路，不仅追溯其历史渊源，而且简要介绍了它在磁体工程、加速器、核磁共振及医学磁共振成像等现代活跃技术领域中的新发展、新应用。     

惠斯登电桥测电阻的误差分析

本文较系统地分析了用惠斯登电桥测电阻实验中的系统误差，并提出了代换法消除系统误差的方法．     

采用脉冲悬丝法测量强流加速腔聚焦场磁轴

 介绍了利用脉冲悬丝法校正、测量加速腔磁轴，以及对10MeV LIA束输运系统中40cm长聚焦线圈磁轴偏差的测量，详细描述了实验装置和实验方法。从测得的电压波形可区分出磁轴的倾斜与偏移，并可辨别出倾斜与偏移的方向，在聚焦线圈轴向磁场最强为0.072T的条件下，通过多次实验改变悬丝电流从0 .3A到3.8A，并改变电流脉冲宽度从0.3ms到1.5ms，测出了40cm聚焦线圈磁轴的偏差，并给出了磁轴偏差分布的对应波形。测试灵敏度估计为磁轴倾斜1mrad, 偏移0.2mm。     

Thermally stimulated current study of the molecular movements in bone

Thermally Stimulated Current (TSC) has been used for investigating the interface and interphase in a natural composite, bone. Young adult male femoral diaphysis has been studied at different stages of demineralization by EDTA. Analysis of the fine structure of complex TSC spectra has shown that in the early stages of demineralization, dielectric relaxations are due to the hydroxyl reorientations in the mineral apatite structure. After a certain stage of demineralization, the mineral response disappears and organic matrix mobility is observed. A dissociative buffer has been used to identify collagen relaxations. The contribution of the mineral-organic interface/interphase has been isolated.     

Limiting Current of Copper Electrodeposition from a Copper Sulfate Solution under Conditions of Natural Convection: The Space Charge Effect

Copper electrodeposition from a copper sulfate solution under conditions of natural convection is analyzed theoretically and examined experimentally. The space charge, which forms in the near-cathode layer, is shown to affect the limiting current density and to change its concentration dependence.     

Tunneling Dynamics of the Halves of a Double-Well Trap Containing a Bose-Einstein Condensate

In this paper, we have studied tunneling dynamics of the halves of a double-well trap containing a Bose-Einstein condensate. It is found that there exist step structure and macroscopic quantum self-trapping of populationdifference of atoms, and exist Shapiro-like steps of atomic tunneling current. Both the population difference and theatomic tunneling current depend strongly on the total number of atoms and the initial phase difference.     

反射相移对光学玻璃电流传感器抗电磁干扰能力的影响

在光学玻璃电流传感器中，如果光线反射转向时在光的ｐ，ｓ分量之间引入反射相移，则会对该传感器的抗电磁干扰能力产生不良影响，本文对这种情况进行了理论上的分析，并给出了数值模拟和实验的结果。     

A grain boundary defect model for ZnO ceramic varistors by deep heat treatment

Studies on ZnO ceramic varistors by deep heat treatment at 650–900 C are reported. The current creep time curve exhibits a peak during the continuous action of a dc biasing voltage; the forwardV-l characteristic is improved rather than degraded after the action of the biasing voltage. We assume that the zinc interstitial cations Zn_i are out diffused rapidly and the concentration of Zn_i in the depletion layer is decreased rapidly during deep heat treatment; the oxygen anions O’_o could be accumulated at the grain interface if the out diffusion quantity of Zn_i is not enough to react with the O’_o; the current creep phenomenon above results from the migration of the interface O’_o by the biasing voltage. We suggest an improved grain boundary defect model for the ZnO varistors by deep heat treatment, and examine the model using the experimental data of lifetime positron-annihilation spectroscopy. Project supported by the National Natural Science Foundation of China.     

ASYMPTOTIC BEHAVIOR OF ECKHOFF＇S METHOD FOR FOURIER SERIES CONVERGENCE ACCELERATION

The current paper considers the problem of recovering a function using a limited number of its Fourier coefficients. Specifically, a method based on Bernoulli-like polynomials suggested and developed by Krylov, Lanczos, Gottlieb and Eckhoff is examined. Asymptotic behavior of approximate calculation of the so-called ＂jumps＂ is studied and asymptotic L2 constants of the rate of convergence of the method are computed.