铝电解电容器用低压箔接触电阻超标分析

通过金相分析和铝箔铆接后的接触电阻对比,研究了铝箔的腐蚀形貌、铝箔表面粉状物、氧化膜厚度、引线质量、铆接工序控制等对接触电阻的影响。提出了降低接触电阻的几点建议:①采用多级变频复合腐蚀工艺,以得到“乔木状”的蚀孔。②改进处理工艺,减少粉状物的产生。③调整工艺控制条件,改善腐蚀形貌。     

Determination of Thermal Conductivity of Liquids by a Multi-Point Laser Pump Method

As an advanced optical method, a multi-point pump method is presented for measurements of thermo-physical properties of liquids. Meanwhile, based on the laser-induced thermal grating method, a new theory model is presented and used to analyse the thermal effects caused by the multi-point laser pump, by which the thermal conductivity of liquids can be obtained. The results of some typical liquids, such as water, ethanol and acetone, are presented and are consistent with those of acknowledged values, demonstrating that the multi-point method is simple and useful for characterizing thermal properties of liquids.     

RSA算法中的代数结构

本文首次应用二次剩余理论对RSA中的代数结构进行了研究.计算出了Zn中模n的二次剩余和二次非剩余的个数,对它们之间的关系进行了分析,并用所有二次剩余构成的群对Zn进行了分割,证明了所有陪集构成的商群是一个Klein四元群.对强RSA的结构进行了研究,证明了强RSA中存在阶为φ(n)/2的元素,并且强RSA中Zn可由三个...     

一种新的可调频等离子体辐射源

本文介绍了一种频率连续可调的等离子体辐射源。它是利用波与相对论等离子体前沿相互作用产生多普勒频移来产生辐射的。针对ＴＥ波与圆波导内低密度等离子体前沿相互作用，本文推导了所产生的辐射脉冲的上移频率、反射效率、传输效率和脉冲长度等计算公式。     

High-mobility germanium p-MOSFETs by using HCl and(NH_4)_2S surface passivation

To achieve a high-quality high-κ/Ge interfaces for high hole mobility Ge p-MOSFET applications,a simple chemical cleaning and surface passivation scheme is introduced,and Ge p-MOSFETs with effective channel hole mobility up to665 cm2/V·s are demonstrated on a Ge(111) substrate.Moreover,a physical model is proposed to explain the dipole layer formation at the metal–oxide–semiconductor(MOS) interface by analyzing the electrical characteristics of HCl- and(NH4)2S-passivated samples.     

机抖激光陀螺检测电路前置放大器的设计与分析

首先简单介绍了激光陀螺信号特点,在此基础上设计一种实用的低噪声、大动态范围的激光陀螺前置放大整形电路。分析了该放大电路的基本工作原理,计算了放大电路的传递函数、相对误差和噪声。理论分析和实验结果表明：该放大整形电路完全能够满足激光陀螺的实用要求,并成功应用于机抖激光陀螺检测系统上,取得了良好的效果。     

Forward acceleration and generation of femtosecond megaelectronvolt electron beams by an ultrafast intense laser pulse

We present a new mechanism of energy gain of electrons accelerated by a laser pulse.It is shown thatwhen the intensity of an ultrafast intense laser pulse decreases rapidly along the direction of propagation,electrons leaving the pulse experience an action of ponderomotivc deceleration at the descending part ofa lower-intensity laser field than acceleration at the ascending part of a high-intensity field, thus gain netenergy from the pulse and move directly forward. By means of such a mechanism, a megaelectronvoltelectron beam with a bunch length shorter than 100 fs could be realized with an ultrafast(≤30 fs),intense (>10~(19)W/cm~2)laser pulse.     

一种起始点无关的小波轮廓描述符

针对现有小波轮廓描述符依赖于起始点的问题,提出一种自相关小波轮廓描述符.首先对经过平移和尺度归一化后的轮廓进行小波变换,再将各个频段小波系数进行自相关变换,消除起始点变化对描述结果的影响,得到最终的自相关小波轮廓描述符.该描述符彻底摆脱了对起始点的依赖,同时具有较高的描述精度.实验结果证明了自相关小波轮廓描述符的有效性.     

提高感应电能传输效率的研究

非接触式感应电能传输系统（ICPT）是一种新型的电能传输技术,通过感应电磁耦合向负载提供电能。ICPT的关键部件是松耦合变压器（也叫可分离变压器）它的耦合系数较低,制约着传输效率。本文对非接触感应电能传输系统进行了系统的介绍,并且分析了磁芯材料、工作频率、气隙大小等关键参数对传输效率的影响,着重讨论了可分离变压器的初次级绕组的补偿问题,并且给出了补偿电路的设计方案。     

液晶光阀的双稳态特性研究

测量了TB3639型液晶光阀在电压驱动下的光谱特性及其光学双稳态特性,并讨论其产生光学双稳态特性的非线性效应物理机制,分析了液晶光阀的光学双稳态特性不明显的原因.分析结果表明,扭曲角对液晶光阀的光学双稳态特性影响较大,由于TN型液晶光阀的扭曲角只有90°,导致其双稳态特性不是很明显,TB3639型液晶光阀在某一电压范围内存在光学双稳态特性.