热释电系数测试系统的研究

介绍了热释电系数的测量原理,建立了一套热释电系数的测量系统,并就热动态电流法中恒定温度变化率的温控系统进行了深入的讨论。     

新颖的有限双极性控制ZVZCS PWM全桥变换器

讨论了一种新颖的有限双极性控制ZVZCS PWM DC／DC全桥变换器,通过在次级增加一个小电容和两个小二极管组成的简单辅助电路,为主开关提供实现ZVZCS开关条件,也为副边整流提供箝位电压．与以往的移相ZVS PWM全桥变换器相比,文中所提出的变换器具有辅助电路简单,负载范围宽、环流自适应调整等优点．详细分析了该变换器的工作原理及参数设计,通过一台2．5kW、100kHz模型的仿真实验,验证了变换器工作原理的正确性．     

用丝电流方法快速识别HL-2A等离子体边界

利用等离子体外部测量的磁场信号,使用丝电流方法对HL-2A等离子体边界进行了快速识别。介绍了该方法的原理、相关的测量系统配置和该程序的研制进展。对识别结果进行了讨论。     

自适应控制在HL-2A等离子体电流控制中的应用

研究了一种新型的坚实可靠的自适应控制算法在HL-2A装置等离子体电流控制中的应用,并使用MATLAB进行了计算机仿真。结果表明,该控制方法与典型的PID控制相比,能显著地提高系统的动态响应性能。且具有较好的抗干扰性。     

新型钕铁硼电磁阻尼演示仪

利用稀土永磁材料钕铁硼（Ｎｄ－Ｆｅ－Ｂ）设计制作出一种新型电关演示仪,可演示阻尼振动的三种状态（欠阻尼状态、临界阻尼状态、过阻尼状态）,配合投影仪使用,演示效果显著。     

Exact Stationary States of a Two-Dimensional Transport Model

Previous calculations of transport coefficients of particle systems in two or more dimensions have used computer simulations or various approximations, like those implicit in the Boltzmann equation or in the standard probability theory of diffusion. Here an exactly solved model of crystal growth in three dimensions is transformed into a 2D model of steady particle transport. Then the exact, many-body stationary distribution and exact transport coefficients can be found as well as correlation functions. The model is highly asymmetric. In the transverse direction, particles are strongly attracted, so that long transverse rows of particles tend to form at low temperature. Kinks in these rows are rare, so the transverse positions of kinks effectively move continuously on a large distance scale.     

纵向耦合对垂直腔面发射激光器的影响

考虑到垂直腔面发射激光器中的光子与载流子的纵向耦合,在行波速率方程中引入了纵向耦合因子。利用这个速率方程,讨论了阀值电流与量子阱数目的关系,计算结果表明光子与载流子的纵向耦合是不容忽视的。给出了阀值电流表达式,它表明纵向耦合因子越大,阀值电流越低。     

A Simple Derivation of Josephson's Formulae in Superconductivity

A simple and general derivation of Josephson's formulae for the tunneling currents is presented on the basis of Sewell's general formulation of superconductivity in relation to off-diagonal long-range order (ODLRO).     

Cathodoluminescence of Eu2+ in EuGa2S4 and Ga2S3:Eu2O3

We present the results of an investigation of the cathodoluminescence of the Eu²⁺ ion in gallium chalcogenides (Ga₂S₃) and europium thiogallate (EuGa₂S₄). We show that the intense wide-band radiation of these compounds is due to the 4f-5d transitions of the Eu²⁺ ions. With increase in the Eu²⁺ percent composition from 0.1 to 5.0 mol.% the luminescence brightness increases and then decreases. Translated from Zhurnal Prikladnoi Spektrskopii, Vol. 67, No. 2, pp. 268–270, March–April, 2000.     

稳态装置中的尘埃等离子体状态

介绍了用于研究尘埃等离子体中波的直流放电的尘埃等离子体装置,该装置能产生长约３０ｃｍ,直径约８．４ｃｍ的尘埃等离子体柱。在等离了体中加入尘埃后,朗缪尔探针的饱和电流明显降低。尘埃所带负电量与电机转速成正比,可达到等离子体负电量的４０％。