用等势面性质求解一类静电问题

本文从一般理论出发，利用等势面和场强垂上的性质，给出了求解一类静电问题的方法。这类问题是：其等势面是一系列与某坐标面平行的曲面。算例表明：该方法简单而有效，且便于掌握。     

正常金属/自旋三重态p波超导体结隧道谱的奇异性

利用Blonder，Tinkham和Klapwijk理论计算了正常金属/绝缘层/正常金属/自旋三重态的p波超导体结的隧道谱和平均电流.计算结果表明：在自旋三重态p波超导结的隧道谱中存在零偏压电导峰、零偏压电导凹陷和双凹陷结构，并有微分电导随偏压震荡的现象出现，在I-V曲线上出现电流台阶.这些结果在理论上支持Sr₂RuO₄的超导态是自旋三重态p波超导态. 关键词： 自旋三重态超导体 p波超导体 隧道谱     

求解格林函数的本征函数法

从本征函数理论出发，本文介绍了求解第一类格林函数的本征函数法。从而对格林函数的本征函数法建立进行一般的理论概括。最后举例说明应用。     

Removing paint from a metal substrate using a flattened top laser

In this paper,we investigate laser cleaning using a flattened top laser to remove paint coating from a metal substrate.Under the irradiation of a flattened top laser,the coating paint of the metal substrate can be removed efficiently by laser induced ablation,stress,and displacement force.The temperature distribution,stress,and displacement are calculated in the coating layer and substrate using finite element analysis.The effects of a Gaussian laser and a flattened top laser and the results of different diameters of laser spot are compared.The investigation shows that the flattened top laser can reduce the substrate damage and enhance the cleaning efficiency.This method meets the need of large area industrial cleaning applications by optimizing the flattened top laser parameters.     

Multipole resonance in the interaction of a spherical Ag nanoparticle with an emitting dipole

The effect of multipole resonance in the interaction between a spherical metallic nanoparticle （MNP） and an emitting dipole is studied with the Mie theory. The results show that the absorption peak of the MNP with respect to the field of the emitting dipole is blue-shifted with the decrease of the spacing between MNP and emitting dipole due to the enhanced multipole resonance. At a short distance, the enhanced multipole terms of scattering are not obvious compared with the dipole term. For the decay rate of the emitting dipole, multipole resonance brings about the enhancement of it largely at short spacing. For the radiative decay rate, the behavior is quite different. The dipole term is dominant at a short spacing, and the multipole term is dominant at a larger spacing.     

s/FI/d超导结的直流Josephson电流

在 s波超导体 /铁磁绝缘层 / d波超导体 Josephson结 (s/ FI/ d)中 ,考虑结界面铁磁绝缘层的磁散射和粗糙散射情况下 ,运用 Bd G方程和 FT的电流公式计算准粒子的输运系数及 s/ FI/ d结的直流 Josephson电流与温度 T、结两侧的相位差之间的关系。研究表明 :结界面的磁散射和粗造散射均抑制结中准粒子的 Andreev反射 ,降低了流过 s/ FI/ d结的直流 Josephson电流 ,直流Josephson电流 I随温度 T、相位差φ的变化曲线强烈地依赖于 d波超导体的晶轴方位     

A Passive Q-Switched Microchip Er/Yb Glass Laser Pumped by Laser Diode

A laser-diode-pumped 1.54-μm passive Q-switched erbium doped glass laser was reported. We utilize a laser diode with wavelength of 973nm to pump a 1-mm Er/Yb co-doped phosphate glass with the erbium and ytterbium concentrations of 1 wt.% and 21 wt.%, respectively. A Co^2＋ ：MgAl2O4 slab crystal was used as a passive Q- switcher. Q-switched pulses with repetition frequency of 800Hz, width of 7.4ns, peak power of 2.2kW and average power of 13.3 m W were obtained when absorbed pump power was 4 75 m W. A sandwich structure of the Q- switched microchip Er/Yb glass laser was demonstrated, which shows shorter pulse width of 6.8 ns. Dependences of pulse duration and repetition frequency on pump power were also investigated.     

狭义相对论时空观中"课程思政"的探索与实践

本文提出了“狭义相对论时空观”实施“课程思政”的具体方案.从狭义相对论时空观的知识出发,深入挖掘课程思政元素,通过多种教学方式将其恰当、自然地融入课堂,潜移默化地将正确的价值追求和理想信念传达给学生,达到提高学生思想政治水平、完善学生人格的目的.以问卷调查的方式对“课程思政”教学效果进行评价和反馈,及时改进教学设计,提升教师自身“课程思政”的能力和素养.本文实现了狭义相对论中“课程思政”的“备”“教”“学”“评”的全部教学环节,立足“思政元素”与专业知识的契合点,探索了有机互融的教学方式,促进了学生知识技能上的“成长”和精神上的“成人”同向同行.期望本次教学实践能对“课程思政”建设提供一点思路和参考.     

上转换对Er3+，Yb3+共掺磷酸盐玻璃激光器输出的影响

研究了激光二极管抽运的Er^３＋，Yb^３＋共掺磷酸盐玻璃激光器中共协上转换(cooperative upconversion)和累积能量转移(cumulative energy transfer)对激光输出的影响.通过对速率方程的数值模拟，定量计算并分析了共协上转换和累积能量转移对激光输出的影响，发现共协上转换对阈值抽运功率的影响可达到22%之多，实验结果和理论曲线相当符合.这有助于对Er^３＋，Yb^３＋共掺磷酸盐玻璃激光器进行优化. 关键词： 共协上转换 累积能量转移 ３＋')" href="#">Er^３＋ ３＋共掺磷酸盐玻璃激光器')" href="#">Yb^３＋共掺磷酸盐玻璃激光器 数值分析     

LD抽运Er3+，Yb3+共掺磷酸盐玻璃被动调Q激光器的理论分析和数值计算

研究了以Co²⁺:MgAl₂O₄晶体为饱和吸收体的LD抽运Er³⁺,Yb³⁺共掺磷酸盐玻璃激光器.针对双掺离子之间的能量传递和Er³⁺的多种跃迁过程，结合Co²⁺:MgAl₂O₄晶体中Co²⁺离子的饱和吸收特性，给出了详尽的速率方程，在其基础上进行了数值分析，分析了输出镜透过率、激光介质长度、谐振腔长度、腔内往返损耗、饱和吸收体长度对激光阈值、峰值功率、单脉冲能量以及脉冲宽度的影响.