CO_2激光光栅式扫描修复熔石英表面缺陷的实验研究与数值模拟

基于熔石英材料对波长为10.6μm的CO2激光具有强吸收作用这一特点,提出采用CO2激光光栅式多次扫描修复熔石英光学元件表面密集分布的划痕和抛光点等缺陷的方法.实验结果表明,在合理的扫描参数下,元件表面的划痕和抛光点等缺陷可被充分地消除.损伤阈值测试结果表明,表面划痕和抛光点等缺陷被完全消除的元件的损伤阈值可回复到或超过基底的损伤阈值.同时结合有限元软件Ansys的模拟结果分析了CO2激光扫描修复及消除元件表面划痕和抛光点等缺陷的过程.本文为消除元件表面划痕和抛光点等缺陷提供了非常有意义的参考.     

ZrO2/SiO2溶胶-凝胶薄膜膜层间的渗透行为

分别以丙醇锆和正硅酸乙酯为原料,采用溶胶-凝胶工艺制备了性能稳定的ZrO2和SiO2溶胶。用旋转镀膜法在K9玻璃上分别制备了单层SiO2薄膜、单层ZrO2薄膜、ZrO2/ SiO2双层膜和SiO2/ZrO2双层膜。采用原子力显微镜观察了薄膜的表面形貌,用椭偏仪测量薄膜的厚度与折射率,用紫外-可见光分光光度计测量了薄膜的透射率。对薄膜的透射光谱和椭偏仪模拟的数据进行分析,发现SiO2/ZrO2双层膜之间的渗透十分明显,而ZrO2/SiO2双层膜之间几乎不发生渗透。利用TFCalc模系设计软件,采用三层膜模型对薄膜的透射率进行模拟,得出的透射曲线与用紫外-可见光分光光度计测量的透射曲线十分符合。     

Near threshold photodetachment cross section of negative atomic oxygen ions

A 40-target state close-coupling calculation for the photodetachment cross section of negative atomic oxygen near threshold is carried out with core－valence electron correlation by using the R-matrix method. It was shown that after considering the excitations of two electrons from the 2s shell, the electron affinity of O^- (2s^22p^5{}^2P°) agrees with the experimental result much better than that just considering the excitations of electrons only from the 2p shell as well as only one electron from the 2s shell. Total cross section as well as the main contribution of the ionization channels to the partial cross section are illustrated to show the structure near threshold clearly.     

一些新的含连三唑环的Aza-Wittig试剂的合成与表征

报道以取代芳胺为原料经重氮化,叠氮化,1,3-偶极环加成反应得到1-代芳基-4-乙氧羰基-5-胺基-1,2,3-三唑,并以此为原料合成了一些新的Aza-Wittig试剂---1-取代芳基-4-乙氧羰基-5-三苯膦化亚胺基-1,2,3-三唑。     

40J激光装置研制

 报道了一台输出能量在40J量级的激光装置。该装置从星光Ⅱ激光装置分光作为光源,由放大器链、能源系统和支撑桁架等三大部分构成。对整个激光装置的模拟计算结果表明：装置的增益能力足够输出40J,B积分满足ΔB小于1.8的要求。研制了一种全腔水冷新型放大器,对其小信号增益系数和增益均匀性进行了测量,实验得出增益系数β为0.034cm ^-1,增益均匀性为91.84%。结果表明这种放大器完全能满足此激光装置的设计要求。     

利用点在圆锥曲线内(外)部解“范围”问题

利用点在圆锥曲线内（外）部解“范围”问题袁兴发（陕西镇巴县中学７２３６００）已知圆锥曲线Ｃ上存在不同的两点关于直线ｌ（含参数）对称，求参数的范围，对这类问题，这里介绍一种解法，即利用点在曲线内部或外部导出不等式，从而确定参数的取值范围．圆锥曲线的含焦...     

Spectra and Spin Polarization of the Valence Band Auger Emission from Cr （100） Surface

Calculations have been carried out on spin-polarized Auger electron emission from a seven-layer chromium (lO0)-film. The core and valence states concerning the Auger transition are obtained from a self-consistent full-potential linearized augmented plane wave calculation by using a repeated slab geometry. The calculations refer to experiments on the L3M23 V- and L3 VV-transRions that have recently been carried out by Heinzmann et al. The Auger spectrum obtained for the L3VV transition agrees relatively well with our calculations, whereas the observed L3M23V-Auger structure is considerably wider than that predicted by our theory. Nevertheless, the spin-polarization in the latter case, which is about -13%, is in fair agreement with the experiment, different from the L3VV-transition where the experiment yields -10% as opposed to the theoretical value of -25%. We give possible reasons for the origin of these discrepancies.     

Laminar boundary layer between two planes perpendicular to each other

In this paper, we obtain a third-order approximate solution for the laminar boundary layer between two planes perpendicular to each other.In boundary layer equations, the viscous and the inertial terms have the same quantity step. In this paper, at first, supposing that the inertial terms are bigger than the viscous terms, we solve the boundary layer equations, and then we suppose that the viscous terms are bigger than the inertial terms. At last, we take the mean value as the valid solution of the boundary layer equations.The first- and the second-order approximate solutions obtained in this paper coincide with the results in ref. [1], while the third-order solution obtained in this paper is better than that in ref. [1].     

固相微萃取研究进展

对固相微萃取的发展背景，应用及其研究进展作了综述。引用文献 145篇。     

间接原子吸收法测定乳酸环丙沙星

研究了在弱酸性介质中，乳酸环丙沙星与雷氏盐定量生成缔合物的反应条件，以及通过原子吸收法测定沉淀中Cr的含量而间接测定乳酸环丙沙星含量的分析方法。线性范围在5－40mg/L，相对标准偏差为2．5％，回收率在98％－101％之间。