浅析计算机多媒体技术在劳教场所教学过程中的运用

本文分析了在劳动教养场所教学过程中运用计算机多媒体技术的优势,并对目前计算机多媒体技术运用于教学过程中产生的问题进行了剖析。在此基础之上,笔者结合自身的教学实践和经验,对合理运用计算机多媒体技术进行课堂教学提出了几点建议。     

Absorption Related to Electrochromism in Cubic Boron Nitride Single Crystals

A unusual electrochromism is observed in amber cubic boron nitride （cBN） single crystals when breakdown possibly related to impurities and defects occurs. The electrochromism induces an abrupt increase in the absorption coefficient of the cBN crystals within the visible and infrared region. The change of the absorption coefficient of cBN crystal can be increased linearly by raising the current after the electrochromism occurs, whereas it is irrelevant to the polarization of the incident light. The absorption related to the electrochromism in the cBN single crystal has potential applications in designing and manufacturing electro-optical modulators, optical switches, and other optoelectric devices.     

用电调制反射光谱的方法确定能带中临界点的位置

本文用通常的仪器和简单的方法,测量了半导体材料的电调制反射光谱,从而确定出能带中临界点的位置。其特点是把半导体二极管作为光电倍增管的负载以自动实现交、直流两种讯号相除的方法,测量了反射的相对调制(ΔR)/(R),并给出了由测量过程本身自洽地确定二极管的有效动态电阻区的方法。     

Quadratic nonlinear response to 1.56-μm continuous wave laser in semi-insulating GaAs

The nonlinear photoresponse to a 1.56μm infrared continuous wave laser in semi-insulating （SI） galliu- marsenide （GaAs） is examined. The double-frequency absorption （DFA） is responsible for the nonlinear photoresponse based on the quadratic dependence of the photocurrent separately on the coupled optical power and bias voltage. The electric field-induced DFA remarkably affects the native DFA in SI GaAs. The surface electric field or the surface band-bending of SI GaAs significantly affects the magnitude variation of the Dhotocurrent and dark current     

Experimentally distinguishing electro-optic effects in silicon

Different electro-optic effects, such as Kerr effect, Pockels effect induced by the electric field or strain, and plasma dispersion effect exist in silicon. Experimentally distinguishing these effects is necessary for designing silicon-based electro-optic devices. According to their different polarization dependencies and frequency responses, these effects are measured and distinguished successfully via a transverse electro-optic modulation experiment based on the near-intrinsic silicon sample. The results indicate that Pockels effect induced by the electric field or strain is primary among these effects in the near-intrinsic silicon sample.     

立方氮化硼横向电光调制半波电压的测量

宽禁带半导体材料立方氮化硼(cBN)具有闪锌矿结构和43m点群对称性,因此cBN晶体也是电光晶体。用cBN晶体进行了横向电光调制,首次观察到cBN的电光效应,并且测得了样品的半波电压．     

立方氮化硼单晶紫外吸收光谱的研究

对于在高温、高压下合成的人工立方氮化硼(cBN)片状单晶进行了紫外吸收光谱和第一性原理的能带结构研究。实验中采用了UV WINLAB光谱分析仪,数据分析由MOLECULAR SPECTROSCOPY软件进行拟合运算,通过特殊的石英夹具对样品的测试表明cBN的紫外吸收波长限为198 nm,带隙为6.26 eV。结合第一性原理计算的cBN的能带结构和电子态密度的计算,可以证实导致紫外光吸收的过程是价带电子吸收光子到导带的间接跃迁。文章实验结果与目前报道的cBN能带结构中禁带宽度的吻合较好,表明cBN具有良好的紫外特性,是一种具有发展前景的紫外光电和高温半导体器件材料。     

浅析计算机多媒体技术在劳教场所教学过程中的运用

本文分析了在劳动教养场所教学过程中运用计算机多媒体技术的优势,并对目前计算机多媒体技术运用于教学过程中产生的问题进行了剖析。在此基础之上,笔者结合自身的教学实践和经验,对合理运用计算机多媒体技术进行课堂教学提出了几点建议。     

3CCM硅磁敏三极管工作机理

本文首次指出3CCM硅磁敏三极管的磁敏效应是载流子双注入效应和霍耳效应的结合。反向偏置的收集结允许空穴和阻挡电子通过。积累在收集结附近的电子产生霍耳电场。霍耳电场和劳仑兹力对空穴产生同一方向的作用力,所以这种磁敏管的磁敏电流的线性度和灵敏度都比较高。     

PCM160型锤式破碎机强制润滑装置制作

从实用角度出发,研究了PCM160系列锤式破碎机主轴轴承润滑不良的成因,并自制了一套简单可靠的强制注油装置,从根本上解决了这类破碎机的注油润滑问题。