偏磁式消弧线圈自动调谐新原理及应用

通过对偏磁式消弧线圈原有控制方法的分析,提出了新的电网电容电流自动跟踪测量方法,即通过测量中性点电流及其相角差来检测,进而提出了消弧线圈的双机控制原理,并对该方法进行了仿真分析。研制出基于上述原理的调谐控制器。给出了控制器的软硬件框图,并在低压模拟电网上进行了实验。实验结果表明该方法电容电流检测误差小于2%,动态过程的时间小于2个周期。该方法显著提高了电容电流的计算精度,并将进一步在实践中应用。     

基于短路功率方向和通信方法的自适应电流速断保护

传统的电流速断保护和现有的自适应电流速断保护不能保护线路全长,且其保护范围会随系统运行方式的变化而改变。在分析这两种保护的保护范围的基础上,给出了一种可保护线路全长的自适应电流速断保护原理:借助于通信手段发送相邻保护的短路功率方向信号以确保选择性的自适应电流速断保护,并将其性能与前两种电流速断保护的性能进行了比较。     

架空避雷线分流变电站入地电流的简易计算

高压送电线路的架空避雷线因防雷直接联接到变电站和线路杆塔的接地网,从而也将变电站内接地故障的入 地电流分流到站外,减少站内的入地电流。本文对分流作用提出一个简易的计算方法,可供变电站设计时作参考。     

The Relationship Between Witnessing Parental Conflict During Childhood and Later Psychological Adjustment Among University Students: Disentangling Confounding Risk Factors.

The purpose of the current study was to examine in detail the association between witnessing domestic violence (DV) and long-term psychological adjustment. Important limitations of past research were addressed, including controlling for several associated risk factors. Special attention was paid to whether the perpetrator of the violence was the maternal or paternal figure, as well as to whether the witness to the violence was male or female. Participants completed measures examining DV witnessed, direct child abuse experienced, and current psychopathology. Following screening for physical and sexual abuse, a sample of 351 individuals was selected. Four groups of participants were compared. Results indicated that individuals who had witnessed either physical DV or major psychological DV had higher levels of psychopathology than individuals who reported witnessing minor psychological DV or controls. After controlling for direct psychological abuse experienced, witnessing DV remained a significant predictor of psychopathology for males but not for females. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

基于虚拟仪器的电流互感器校验仪的研制

以LabVIEW为开发工具研制出一种新型电流互感器校验仪,它发挥虚拟仪器灵活、可自定义、具有强大数据处理和分析功能、易于嵌入数字补偿等特点。该校验仪利用离散Fourier变换(DFT)方法和数字补偿技术,能准确地测定出电子式电流互感器及传统电流互感器的比差、角差、频率、谐波等多个技术性能指标,并且具有便于携带、易于拓展功能、开发周期短、检定工作效率高等优点。     

功率集成电路中过热保护电路的设计

过热保护电路对于功率集成电路而言无疑是十分重要的。在集成电路中的过热保护电路一般利用二极管、三极管的温度特性来做传感器。阐明这种电路的优缺点、工作原理,并对其进行分析。该保护电路主要应用于功率集成电路中,也可以应用于一般的数字或模拟芯片中。     

CMOS图像传感器关键技术及其新进展

阐述了CMOS图像传感器芯片的基本现状,给出了目前应用在民用相机上存在的固定图形噪声、暗电流噪声以及像素间串扰等问题的解决方法与对策。并通过对CMOS图像传感器的新技术进行探讨,预测了CMOS图像传感器的应用前景与发展前途。     

钛合金在高温高压过热蒸汽中的腐蚀机理研究

研究了T225NG和T42NG合金在高温、高压、过热蒸汽中长时间的氧化腐蚀规律。对试样表面氧化膜元素、相组成及表面形貌进行了测试与分析，给出了两种合金的腐蚀动力学模型．并对两种合金的腐蚀机理进行了初步分析。结果表明，两种钛合金中主元素Ti优先产生氧化腐蚀，合金元素Al和Fe及N、H、C等杂质元素对腐蚀起到促进作用，并在合金表面呈现出典型的结晶学特征。两种钛合金的腐蚀动力学规律均服从Wagner理论中的近抛物线规律。     

Analysis of NEA C5MOX benchmark with computer code “cohint” based on interface current approach

Interface current approach to solution of neutron transport equation has been earlier used for LWR lattice problems. The analysis of the C5MOX benchmark is a opportunity to test its applicability to heterogeneous reactor problem. Computer code COHINT, which incorporates a routine for solution of neutron transport equation in X-Y geometry by interface current approach was used for this analysis by representing the fuel rod as a square one. Region interface angular fluxes are represented by a four-term expansion. It is found that the average pin power error is about 2.28 % (peak pin error 4.1 %) relative to reference calculations. Further improvement is possible by introduction of the capability to represent circular rods with in a square cell in COHINT.     

钛合金薄壁轴套类工件的切削加工

从刀具的选用、切削用量、冷却等几方面对钛合金切削中的一些规律进行研究.以切削表面的几何参数和断屑情况等因素为评价指标,以薄壁轴套零件为加工对象,推荐适合该种零件加工的刀具和切削用量.经实际生产应用,所推荐的切削参数可以满足生产要求.