沟道宽度对有机静电感应三极管工作特性的影响

对于实际有机静电感应晶体管(Organic Static Induction Transistor,简称OSIT)器件,采用Marc有限元法建立物理模型,选取合适的结构参数,对OSIT导电沟道内的电势进行离散化数值分析.依据导电沟道内的电势分布,分析沟道宽度变化对OSIT工作特性的影响.在恒定栅压和漏压下,宽度的增大会使栅极对鞍部点控制能力减弱,沟道内势垒降低,从而导致工作电流的增大.该结论可为如何获取良好的OSIT输出特性提供依据.     

单极型有机静电感应三极管沟道纵向电势分析

研究了单极型有机半导体酞菁铜静电感应三极管（OSIT）导电沟道内纵向电势分布．依据电磁场理论,应用有限元法对其导电沟道内的电势分布进行了数值计算与解析．解析结果证明,导电沟道内鞍部点附近纵向的一维电势分布满足二次方关系．     

单极型有机半导体酞菁铜晶体管的工作特性

根据试制的Au／CuPc／Al／CuPc／Au结构的垂直导电沟道有机薄膜晶体管的测试结果,分析了该晶体管的工作机理．由实验结果可知,驱动电压低,呈不饱和电流-电压特性．晶体管的工作特性依赖于栅极电压和铝电极的结构,垂直导电沟道有利于改善有机晶体管的工作特性．     

多场耦合下压电圆筒的热电弹性瞬态响应

提出一种求解在热冲击和电势激励载荷作用下,正交各向异性压电圆筒结构的热电弹性动力学耦合问题的解析方法.通过实例给出在热冲击和电势激励载荷作用下,正交各向异性压电圆筒内的应力、电位移和电势的瞬态响应历程及其分布规律.     

浅析地下管线施工过程各专业间的科学协调

地下管线综合部署是火力发电厂总布置的重要组成部分之一.厂区地下管线综合布置应与总平面布置、管线之间竖向布置,以及交通运输与绿化设施统一考虑,使厂区内沟道与沟道之间、沟道与管线之间、沟道与道路之间、沟道与各建（构）筑物之间在平面及竖向上科学协调,紧凑合理,减少后期设计与前期设计的矛盾,使人力、物力、财力得到充分的利用,既有利于安全文明生产,又方便日后维护维修.     

电势法测定溶液的PH值——玻璃电极导电机理

用电势分析法测定溶液的PH值是目前国内外广为采用的方法。以玻璃电极作为H~ 离子指示电极、饱和甘汞电极为参比电极。使用酸度计测量电池的电动势,可以直接显示出溶液的PH值。方法简便、迅速、准确。但关于电势法测定溶液PH值的导电机理,尤其是玻璃电极的导电机理,目前国内外虽有些论述,但说法不尽一致。所以研究其导电机理对教学、科研是十分重要的。     

表面Ge沟道pMOSFET阈值电压模型

基于MOS器件的短沟道效应和漏致势垒降低效应理论,通过求解泊松方程,建立了表面Ge沟道pMOSFET的阈值电压模型.基于该模型对表面Ge沟道MOSFET器件的沟道长度、栅氧化层厚度、衬底掺杂浓度、SiGe虚拟衬底中的Ge含量等结构参数以及漏源电压对阈值电压的影响进行了模型模拟分析.模拟结果表明,当沟道长度小于200nm时,短沟道效应和漏致势垒降低效应对阈值电压影响较大,而当沟道长度超过500nm时,短沟道效应和漏致势垒降低效应对阈值电压的影响可以忽略.模型计算结果与实验结果吻合较好.     

削弱永磁风力发电机电势谐波的极宽调制方法

为削弱永磁风力发电机电势谐波的影响,提出一种极宽调制方法,通过优化发电机结构,提高气隙磁场的正弦化程度来改善发电机电势波形的质量.用ANSOFT软件分别对传统贴面式永磁发电机和新型极宽调制式永磁发电机进行有限元分析,研制了两种转子结构的永磁风力发电机样机,并构建电势波形检测系统进行实验研究.通过实验分析表明,有限元分析结果与样机实验结果一致,极宽调制永磁风力发电机能明显削弱电势谐波,从而证明了利用极宽调制方法削弱永磁风力发电机电势谐波是有效和可行的.     

横向脉冲磁场下悬臂导电薄板的动力屈曲

针对处于外加横向强脉冲磁场下的悬臂导电薄板,建立了计及面内电磁体力、磁场、涡电流场和变形场的理论模型.对空间部分采用有限元法,对涡电流、导电薄板的时间部分分别采用Crank-Nicolson法和Newmark法,给出了计算程序的求解步骤,定量模拟了强脉冲磁场对面内磁体力和薄板最大挠度的影响.仿真结果表明,由涡电流与磁场相互作用所产生的面内磁体压力直接导致了悬臂导电薄板发生动力屈曲,导电薄板发生屈曲时临界磁场值随着脉冲参数的减小而减小,但随着电导率的增大而减小.     

各向异性导电胶膜的导电粒子电性能研究

各向异性导电胶膜(ACF)连接线路的导电性能对导电粒子的变形影响很大.对ACF粘接后的导电粒子电阻进行了理论模型的建立,分析了导电粒子变形程度对其导电电阻的影响,并与实验结果进行了比较,吻合很好;在高温、高湿环境下,通过对导电粒子回弹进行有限元模拟,得到了导电粒子回弹量;并分析了回弹粒子对导电电阻的影响以及导电粒子的数量对总电阻的影响,得到了各向异性导电胶膜连接的线路最佳的导电粒子变形量和湿热环境对其的导电性能的影响程度.     

Studying the operation characteristics and structure of vertical channel copper-phthalocyanine organic semiconductor transistor

The creation of Au/CuPe/Al/CuPc/strueture is a perpendicular type electricity found in the channel of organic static induction transistor. In the following we analyze transistor operation characteristics and machine structural relation. The results express that the transistor drives the voltage low and has no-saturation currentvoltage characteristics. Its operation characteristics are dependant on gate bias voltage and the construction of the aluminum eleetrode. The vertical ehannel of organic static induction transistor （OSIT） , with structure of Au/CuPc/Al/CuPc/ Cu, has been determined. According to the test results, the relation of its operation characteristics aud device structure was analyzed. The results show that this transistor has a low driving voltage and unsaturation Ⅰ-Ⅴ characteristies. Its operation characteristics are dependant on gate bias voltage and the structure of the aluminum electrode.     

复合相导电陶瓷的阻抗谱研究

用低频交流阻抗分析法对相复合导电化陶瓷的导电机构进行了研究，结果表明：导电通路虽由导电相粒子连接而成，但导电相粒子间的接触电阻也是构成样品电阻的重要部分，它随温度上升而下降，使样品呈半导体性。     

Evolutionary Topology Optimization for Heat Conduction Fields

An effective evolutionary method for solving the structural topology design problems of heat conductive fields is presented in this paper. The topology optimization model based on minimizing the heat transport potential capacity dissipation of heat conductive field is then established and the corresponding sensitivity of objective function is derived to determine which elements would be removed of the heat conductive field for having the increment of the objective heat transport potential capacity dissipation minimized. A Filtering technique is employed in sensitivity field to eliminate numerical instabilities in the evolutionary procedure. Numerical examples are presented to demonstrate the validity and the engineering applicability of the evolutionary method by contrast with SIMP method, meanwhile we can come to a conclusion that higher speed of convergence and clearer optimal topology distribution without intermediate elements can be attained by using evolutionary strategy, with the results laying a reliable foundation for the subsequent shape and size optimizations in thermal engineering.     

汇源集团产品销售渠道的管理研究

市场竞争的日趋增强激烈,要求企业经营更加深入化和细致化,提高市场资源的可控程度。而销售渠道作为汇源集团最重要的资源之一,通过整合营销手段,充分地挖掘了市场潜力;通过对分销商进行培育和支持,提高了网点的覆盖率和渗透率,从而提高了市场占有率和品牌影响力,也提高了企业的经营效率、竞争力和经营安全。     

Analytical Modeling of Dual Material Gate SOI MOSFET with Asymmetric Halo

A dual material gate silicon-on-insulator MOSFET with asymmetrical halo is presented to improve short channel effect and carder transport efficiency for the first time. The front gate consists of two metal gates with different work functions by making them contacting laterally, and the channel is more heavily doped near the source than in the rest. Using a three-region polynomial potential distribution and a universal boundary condition, a two-dimensional analytical model for the fully depleted silicon-on-insulator MOSFET is developed based on the explicit solution of two-dimensional Poisson＇s equation. The model includes the calculation of potential distribution along the channel and subthreshold current. The performance improvement of the novel silicon-on-insulator MOSFET is examined and compared with the traditional silicon-on-insulator MOSFET using the analytical model and two-dimensional device simulator MEDICI. It is found that the novel silicon-on-insulator MOSFET could not only suppress short channel effect, but also increase cartier transoort efficiency noticeably. The derived analytical model agrees well with MEDICI.     

防火用电缆隧道隔断门的传热性能研究

防火隔断是电力、冶金、通讯等行业电缆隧道防火的一项重要措施.根据电缆隧道火灾事故特点,利用机械力学和传热学原理,设计了一种新型防火用电缆隧道隔断门,选用冷轧钢板和硅酸铝纤维毡作为主要材料,耐火极限＞72min.通过对门的传热性能的研究,为防火门的设计和改进提供了理论依据.     

一种新的单根垂直接地极冲击特性计算方法

基于电磁场积分方程和插值方法,建立反映接地极上固定节点传导电流变化的状态方程组,用欧拉方法得出状态方程的数值解,进而计算冲击阻抗变化曲线和地面电位的分布情况,提出分析单根垂直接地极冲击特性的新方法。