γ射线辐照Ce：LiNbO3晶体光折变增强的研究

通过吸收光谱的研究，确诊γ射线辐照引起民的ＬｉＮｂＯ３晶体内出现Ｖｏ等缺陷。经过γ射线辐照处理后的Ｃｅ：ＬｉＮｂＯ３晶体型人二波耦合指数增益系数比处理前有所提高，我们认为这各光折变增强的原因是晶体现内缺陷浓度增大，使载流子的电离和迁移运动更为有利。     

Limit cycle oscillation suppression of 2-DOF airfoil using nonlinear energy sink

This paper presents a novel mechanical attachment, i.e., nonlinear energy sink （NES）, for suppressing the limit cycle oscillation （LCO） of an airfoil. The dynamic responses of a two-degree-of-freedom （2-DOF） airfoil coupled with an NES are studied with the harmonic balance method. Different structure parameters of the NES, i.e., mass ratio between the NES and airfoil, NES offset, NES damping, and nonlinear stiffness in the NES, are chosen for studying the effect of the LCO suppression on an aeroelastic system with a supercritical Hopf bifurcation or subcritical Hopf bifurcation, respectively. The results show that the structural parameters of the NES have different influence on the supercritical Hopf bifurcation system and the subcritical Hopf bifurcation system.     

NO2的自增宽及N2O4和CO2外加气体压致增宽系数的激光磁共振方法测量

激光磁共振光谱方法被用来研究NO₂的v₃振转带谱线的线宽及压致增宽。通过实验测量及数据分析得到了NO₂的自增宽系数及外来气体N₂O₄和CO₂对它的压致增宽系数,γ_{NO2-NO2N2O4CO2}⁰=0.043±0.005,0.014±0.003,0.013±0.003MHz/Pa(HWHM),并由此得到了相应的碰撞截面。这些参数的获得对大气污染监测具有十分重要的意义。     

GeoGebra软件与高中数学教学融合——构建可视化高效课堂

信息化时代之下,信息技术被广泛运用于教育当中,在教师的素养教育上发挥出很好的推动效力.特别是在数学教学当中,对GeoGebra软件的良好应用,可以大幅增强课堂教学水平,提升教学成效.GeoGebra软件有助于教师更有效地完成数学的可视化课堂教学,创新了数学课程的教学模式,有着十分重要创新价值与融和意义.本文与实际教学案例相结合,探讨了应怎样借助GeoGebra软件和高中数学的教学融合,建立可视化高效课堂,增强学生在数学方面的核心素养.     

三角形弯晶单色器的分光及聚焦特性研究

北京同步辐射装置(BSRF)的4W1C光束线用斜切角为12.16°的三角形Si(111)、Si(220)和Si(422)晶体在衍射角为23.65°时选择0.252nm、0.154nm和0.089nm波长的单色X光.三角形晶体压弯成柱面,可实现单色光水平方向的聚焦,为漫散射实验站提供聚焦的单色X光.解析计算和SHADOW软件包进行追踪的结果与实验测试结果符合得很好.     

Diode Stack End-Pumped Nd：GdVO4 Continuous Wave Slab Laser

We report a diode stack end-pumped Nd：GdV04 slab laser with a near-diffraction-limited beam. The output power of 45.8 W at 1064nm is obtained under the pumping power of 147 W, with the optical-optical conversion efficiency of 31.2%, and the slope efficiency is 39.6%.     

Passively Mode-Locked Quasi-Three-Level Nd:LuVO4Laser with Semiconductor Saturable Absorber Mirror

We demonstrate a passively a Z-folded resonator. Using device, we achieve stable cw average output power under cw mode-locked Nd：LuVO4 laser operating on the quasi-three-level at 916nm with a semiconductor saturable absorber mirror （SESAM） as the passive mode-locking mode locking with 6.7ps pulse duration at repetition rate of 133 MHz and 88mW the pump power of 17.1 W.     

气体动力学中Гриб-Рябинин方法在水力学中的应用与推广

本文将气体力学中方法(以下简称方法)应用到水力学中去,得到了比气体力学中更好的结果。此外,本文对该法近似解的应用范围以及解的误差作了详细地分析和讨论,扩大了方法的应用范围,提高了解的精度。