Plasma sheet stretching accompanied by field aligned energetic ion fluxes observed by the NUADU instrument aboard TC-2

The NUADU (NeUtral Atom Detector Unit) instrument aboard TC-2 recorded 4л solid angle images of charged particles (E >180 keV) spiraling around the magnetic field lines in the near-Earth plasma sheet (at ~ -7 RE, equatorial dawn-to-night side) during a geomagnetic storm (Dst =-219 nT) on August 24, 2005. Energetic ion beam events characterized by symmetrical, ring-like, solid angle distributions around ambient magnetic field lines were observed during a 34-minute traversal of the plasma sheet by the TC-2 spacecraft. Also, observations during these multiple crossings of the plasma sheet were monitored by the magnetometer experiment (FGM) aboard the same spacecraft. During each crossing, a whistler-mode chorus enhancement was observed in the anisotropic area by the TC-2 low frequency electromagnetic wave detector (LFEW/TC-2) at a frequency just above that of the local lower hybrid wave. A comparison of the ion pitch angle distribution (PAD) map with the ambient magnetic field shows that an enhancement in the field aligned energetic ion flux was accompanied by tailward stretching of the magnetic field lines in the plasma sheet. In contrast, the perpendicular ion-flux enhancement was accompanied by a signature indicating the corresponding shrinkage of the magnetic field lines in the plasma sheet. Since both parallel ion-flux and perpendicular ion-flux enhancements occurred intermittently, the data were interpreted to imply a dynamical, oscillatory process of the magnetic field line (stretching and shrinking) in the near-Earth plasma sheet, which might have acted to help establish an interaction region in this area which would support continuous aurora-substorm triggering during the ongoing magnetic storm. The whistler-mode chorus may have been produced due to ion gyro-resonance during particle pitch angle diffusion after the plasma sheet compression.     

射频PECVD方法生长含氢非晶碳膜的结构及摩擦学性能

利用射频等离子体增强化学气相沉积技术在不锈钢表面制备了含氢非晶碳膜.采用Raman光谱、红外光谱、X射线光电子能谱和原子力显微镜等研究了薄膜的微观结构和表面形貌,在栓盘摩擦磨损试验机上考察了薄膜在不同载荷与滑动速度下的摩擦学性能.结果表明:所制备的含氢非晶碳膜具有典型的类金刚石结构特征,薄膜均匀、致密,表面粗糙度小;薄膜与不锈钢球对磨时显示出良好的抗磨减摩性能;薄膜的抗磨减摩性能同对磨件表面上形成的转移膜以及摩擦过程中薄膜结构的石墨化相关.     

Microstructure and Corrosion Resistance of Cr7C3/γ-Fe Ceramal Composite Coating Fabricated by Plasma Cladding

A new type in situ Cr7C3/γ-Fe ceramal composite coating was fabricated on substrate of hardened and tempered grade C steel by plasma cladding with Fe-Cr-C alloy powders. The ceramal composite coating has a rapidly solidified microstructure consisting of primary Cr7C3/γ- and the Cr7C3/γ-Fe eutectics, and is metallurgically bonded to the degree C steel substrate. The corrosion resistances of the coating in water solutions of 0.5 mol/L H2SO4 and 3.5% NaCl were evaluated utilizing the electrochemical polarization corrosion-test method. Because of the inherent excellent corrosion-resisting properties of the constituting phase and the rapidly solidified homogeneous microstructure, the plasma clad ceramal composite coating exhibits excellent corrosion resistance in the water solutions of 0.5 mol/L H2SO4 and 3.5% NaCl.     

ICP-AES法测定铁精矿中硅、磷、砷含量

本文试验研究了电感耦合等离子体发射光谱分析方法测定铁精矿中的硅、磷、砷含量的仪器工作条件及分析谱线,考查了酸碱加入量及基体对测定结果准确度的影响,加标回收率分别为硅99.1%、磷102%、砷101.5%,RSD值均小于5%。分析方法应用于生产,收到了提高检测数据准确度和指导生产实效性的好效果。     

等离子体物理学与核聚变能

在过去的十余年里，随着石油价格的一路飚升，以及过渡使用化石燃料对环境造成的污染和破坏，人们越来越意识到，寻找干净、环保并且可以满足人类未来发展需求的替代能源已经刻不容缓。在世界范围内有越来越多的人已经明白这样一个现实：只有受控核聚变才能真正满足人类社会未来对能源和环境的需求。     

超细TiO2粉末的应用和制备

根据国内外发表的有关研究成果，并结合作者使用高频等离子化学气相沉积法制制备超细ＴｉＯ２的工作，简要综述了超细ＴｉＯ２粉末的性能，应用及各种制备方法。     

矩阵显示单元旁路电容分析

矩阵显示旁路电容、杂散电容和电容变化都会对显示元件的地址码脉冲、维持电压波形以及邻近单元的初始状态产生影响。在研究过程中通常采用对模拟器件进行测量比较的方法来估算这些电容。对于旁路电路，还可以采用分析旁路系统对电位点的方法进行成功的估算。     

离子注入机高压舱参数光纤隔离遥控方法的研究

２８０ｋＶ全离子注入机由处于高压舱内的离子源、磁分析器及其与高压电极相连的加速管、四极透镜、扫描装置和靶室等部件组成，如图１所示．从离子源引出的离子束先经磁分析器分选，经高压加速系统使带电粒子加速到一定能量后，再经四极透镜传输到扫描系统，最后轰击到靶...     

离子注入过程中金属间化合物的生长模型

给出了在离子注入过程中金属间化合物生长的一个数学模型。在准静态近似下,利用分区处理和引入快、慢变量的方法,给出了该模型的近似解。得到了生长速率与微缺密度、注量率、热发射率之间的定量关系。