平行板静电场法离子引出的对称收集

离子引出的研究在AVLIS工程中有重要的意义，离子引出量和引出时间直接关系到整个系统 的离子收集效率. 在静电场中，由于等离子体屏蔽效应的存在，等离子体电位要高于正、负 极板的电位，而且在靠近正、负极板的两侧均存在鞘层. 理论模拟表明在正极板一边也可以 引出离子. 选取铯（Cs）作为实验对象，研究静电场对Cs等离子体的离子引出，使用安装在 两个极板上的法拉第筒收集离子引出信号. 实验结果表明，正极板确实可以引出离子，随着 外加电压的升高，从正极板一边引出离子的比率降低. 关键词： AVLIS 离子引出 等离子体     

松香试样的预处理及痕量砷的测定方法研究

提出松香样品添加混合助剂MgCO3 Mg(NO3 ) 2 进行干灰化预处理 ,并将此法与硝酸 高氯酸的湿消解法和仅添加Mg(NO3 ) 2 的干灰化法进行了比较。结果表明 ,本法在抑制砷的挥发方面 ,比仅用Mg(NO3 ) 2作为灰化助剂的干灰化法效果更好 ,砷的回收率在 94 %～ 10 5 % ;比用硝酸 高氯酸湿消解法分解试样更彻底 ,可以避免剩余酸除去时引起的砷损失。试验还表明 ,HG AFS测As的检出限DL =0 31ng·mL-1,松香中的砷不用富集便可进行测量 ,对国家标准物质桃叶GBW 0 85 0 1中砷的测定结果与推荐值一致 ,方法的相对标准偏差RSD =2 6 %～ 4 4 %。     

Preparation of Cu（In,Ga）Se2 Thin Film Solar Cells by Selenization of Metallic Precursors in an Ar Atmosphere

Cu（In, Ga）Se2 thin films are deposited on Mo-coated glass substrates by Se vapour selenization of sputtered metallic precursors in the atmosphere of Ar gas flow under a pressure of about 10 Pa. The in situ heat treatment of as-grown precursor leads to the formation of a better alloy. During selenization, the growth of CuInSe2 phase preferably proceeds through Se-poor phases as CuSe and InSe at relatively low substrate temperature of 250℃, due to the absence of In2Se3 at intermediate stage at low reactor pressure. Subsequently, the Cu（In,Ga）Se2 phase is produced by the reactive diffusion of CuInSe2 with a Se-poor GaSe phase at high temperature of up to 560℃. The final film exhibits smooth surface and large grain size. The absorber is used to fabricate a glass/Mo/Cu（In, Ga）Se2/CdS/ZnO cell with the total-area efficiency of about 7%. The low open-circuit voltage value of the cell fabricated should result from the nonuniform distribution of In and Ga in the absorber, due to the diffusion-controlled reaction during the phase formation. The films, as well as devices, are characterized.     

圆锥曲线中一组平行弦的性质

笔者在认真阅读贵F刊2007年第7期时,对《抛物线中一个有趣的等差数列》一文颇感兴趣,在学习之后,试图类比研究椭圆、双曲线的相关性质,现将所得结果与读者共享.在文(1)中有定理F是抛物线的焦点,E是抛物准线与对称轴的交点,O是抛物线的顶点,过F的直线交抛物线于A、B两点,过点O的     

一道课本例题的研究性学习

课本例题是通过精心编拟的，它具有代表性、典型性和可塑性，故在学习中，我们要善于研究它们，为此，本文以一例说明，供同学们参考．     

Ground-State Properties of Ca Isotopes and the Density Dependence of the Symmetry Energy

A relativistic mean field model is used to study the ground-state properties of neutron-rich nuclei in Ca isotopes. An additional isoscalar and isovector nonlinear coupling has been introduced in the relativistic mean field model, which could soften the symmetry energy, while keep the agreement with the experimental data. The sensitivity of proton and neutron density distributions and single particle states in Ca isotopes to the additional isoscalarisovector nonlinear coupling term is investigated. We found that the binding energies, the density distributions of single particle levels are strongly correlated with the density dependence of the symmetric energy in nuclear matter.     

也谈一道高考题

2005年全国高考浙江卷理17（文19）题：     

计及风和湍流的热晕及其相位补偿的数值研究

本工作用包括热晕、湍流和风等效应的等压近似下四维激光传输程序，数值计算了激光大气传输中的整束热畸变效应及其理想相位补偿，得到了各种情况下的激光大气传输畸变图象，并分析了热晕和湍流的相互作用。另外，还讨论了时、空步长的选取原则。