Generation of nondestructive unipolar strong pulsed magnetic fields

An example of a three-coil pulsed magnet is used to describe a method for generating nondestructive strong unipolar pulsed magnetic fields with an induction higher than the Kapitsa limit. This method can be used by a wide circle of experimentalists.     

A bolometer with thermal feedback: Testing of a prototype on the T-11M facility

A prototype of a bolometer with a deep thermal feedback (TF) is described. It allows stabilization of the temperature of an absorbing film at a level of 700–800°C by the control of its thermal radiation. The prototype was tested on a light-ion accelerator and a T-11M tokamak. The results obtained confirm the possibility of practically realize such advantages of the TF bolometer over conventional devices as a fast response, direct measurement of the incident power, improved stability, and a reduced influence of the drift of the intrinsic parameters of the sensor. The questions of the selection of optimal structural parameters of such bolometers and calculation of their threshold characteristics are considered.     

An automated dilatometric system

A setup for studying dilatometric characteristics of metals and alloys in a 20 to 1350°C temperature range in vacuum or an inert gas medium is described. The built-in mass spectrometer is intended to monitor the composition and dynamics of gas release in the process of sample heating. Results obtained during sintering powdered compacts from titanium hydride are given.     

一种有效的数据共享环境多数据源选择算法

针对数据共享环境多数据源选择MDSS(multiple data sources selection)问题,基于Pareto最优理论提出了MDSSA(MDSS algorithm)算法.该算法借助崭新的基于法线测量的非线性路径代价方程计算出到每个数据源的最优路径集合,进而通过代价对比确定实施数据访问的最佳数据源及路径,极大地缩小了搜索空间,在搜索到有效路径的同时,确保了算法的响应时间.大量仿真实验表明,MDSSA算法是有效的.     

钢筋与混凝土粘结力及其施工措施

介绍了粘结力的定义和组成,并分析了各类型钢筋的粘结力及影响钢筋粘结强度的因素,在此基础上,阐述了保证可靠粘结力的施工措施,从而保证混凝土结构体系的安全性、适用性及耐久性。     

惯量和刚度对电动负载模拟器频宽影响的分析

给出了一种电动负载模拟器的系统结构，分析了系统惯量和轴系刚度与系统加载频宽之间的关系并进行了仿真实验研究。结果表明，对于电动负载模拟系统，在选择负载惯量和轴系刚度时，既要考虑使转矩伺服系统有较高的频响，又要考虑系统的稳定性和多余力矩的抑制效果。     

基于直接转矩控制的高性能磁链观测与速度观测

提出了一种高性能的定子磁链和转子磁链的观测方法，并在转子磁链的基础上估算出电机转速，最后将结合磁链观测的速度估计器应用到无速度传感器直接转矩控制系统中。仿真和实验结果表明，这种观测方法能够提高速度的观测精度，增强系统的鲁棒性，并使直接转矩控制系统的低速性能得到较大提高。     

采用三电平拓扑结构的广义有源电力滤波器

提出一种采用三电平拓扑结构的广义有源电力滤波器(GAPF),其具有更高的等效开关频率和电压等级,适合在高压大功率领域中应用.详述了三电平GAPF的拓扑结构、工作原理和控制方法.为克服特定消谐技术实时性差且不利于中性点电压的调节等缺点,采用空间矢量调制技术,并提出一种定量计算小矢量占空比的方法,可实现三电平逆变器直流侧电容电压的精确平衡.仿真结果证明三电平GAPF可以有效地实现无功补偿、谐波抑制、负序滤波等功能,并大幅降低对网侧滤波电抗容量的要求.     

青藏±400 kV格尔木换流站户内直流场厂房屋面结构型式论证

通过对格尔木±400 kV换流站工程中户内直流场厂房屋面采用不同的结构型式,从结构受力、造价预算和施工工期等方面的分析比较,提出经济可行的屋面结构型式,为同行进行类似设计时提供参考。