激光诱导击穿光谱法连续测定高炉流道中的组分和温度

介绍了用于炼铁和炼钢领域过程控制的传感器。用激光诱导击穿光谱法（LIBS）连续测定高炉（BF）流道中的组分和温度,此传感器主要用于高炉流道的在线测量,监测了两次浇铸过程中元素硅、锰和碳的浓度,结果满意。     

GIS壳体振动机理和局部放电优化诊断与应用

为探究气体绝缘组合电器(GIS)电磁感应振动和局部放电(partial discharge,PD)引发电力设备异常振动的机理,建立计及集肤效应的GIS感应涡流及其电磁力的分布模型,设置GIS金属尖端PD发展实验.同步测取GIS局部放电发生时的脉冲电流和GIS壳体振动信号,融合机电信号发掘GIS局部放电的振动特征和机理....     

X80管线钢氢致开裂研究

通过电化学充氢法研究了X80管线钢氢致裂纹(HIC)的种类及开裂特征,探讨了氢致开裂规律,对X80管线钢的氢致开裂影响因素进行了分析.结果表明:随充氢时间的延长和电流密度的增大,氢鼓泡的密度逐渐增大,体积先增大后趋于稳定;形成的氢致裂纹主要呈阶梯状,由直线型裂纹和“S型裂纹”组成,多以穿晶方式扩展,裂纹尖端沿着晶界萌生;X80管线钢中的带状组织是氢致裂纹萌生和扩展的聚集场所;非金属夹杂物是氢致裂纹萌生的裂纹源,其中较大尺寸的A1和Si的氧化物易于诱发“S型裂纹”形成,对管线钢抗氢致开裂的敏感性有很大影响.     

The Void and Hole Effect in D2 Moderated Reactor

The reactivity cbange due to increase in the radius of empty hole was measured in a D₂O moderated reactor and some results differing from experiments with ZEEP were obtained. It can be concluded that the streaming in a hole is not so effective for reactivity. In measuring neutron flux in a void, a flat thermal neutron flux distribution was obtained and it has been concluded that the neutrons leaking through the empty hole or the void do not consist of thermal neutrons but fast neutrons for the most part. The experimental result of reactivity change due to the void location in the core indicates that the relation between the void location and the reactivity change is independent of the neutron flux distribution.     

基于曲面诱导滚动运动原理的胶带输送机转弯装置

为了减小掘进巷道中胶带输送机的数目,文章根据胶带曲面诱导滚动运动原理,对胶带输送机进行了技术设计改造,加装了转弯装置,从而实现利用一台胶带输送机完成整条巷道的掘进。经长期实践证实,装置安全可靠,经济效益显著。     

聚偏氟乙烯中空纤维医用膜的研制

利用非溶剂相转化法,制备不同聚偏氟乙烯(PVDF)改性膜.研究PVDF与聚乙二醇(PEG)-400固含量对膜性能的影响,并将PVDF改性膜与市售血液透析膜F60S的性能进行了对比分析.结果表明,随着PVDF固含量的增加,膜分离孔径和纯水通量逐渐减小,BSA截留率和机械性能提高;随着PEG-400固含量的增加,膜分离孔径先减小后增大,BSA截留率先增加后减小,纯水通量逐渐提高,机械性能下降.PVDF/PEG膜分离孔径与纯水通量比F60S膜略低,BSA截留率、机械性能、血液相容性与F60S膜相比均具优势.     

Currents and Electric Fields Induced in Anatomically Realistic Human Models by Extremely Low Frequency Electric Fields

There is increasing public concern about biological interactions with and the potential health effects of low frequency electric and magnetic fields. Recently, the ICNIRP （International Commission on Non-Ionizing Radiation Protection） has published new exposure guidelines with regard to these fields. The aim of this paper is to demonstrate the calculation of the currents and electric fields induced in the human body by external electric fields at 60 Hz, using numerical human models of anatomically-realistic human bodies, and to compare those results with the basic restrictions proposed by the new guidelines. As a result, in the case that a human is exposed to an electric field of 1 kV/m at 60 Hz the short-circuit current of 18 μA flows though the ankles. Furthermore, the electric field of 40 mV/m in the nervous tissue of the adult model is induced by exposure to external electric fields at the reference level, which is enough smaller than the basic restrictions established in the ICNIRP guidelines for occupational exposure.     

Phase separation time/temperature dependence of thermoplastics-modified thermosetting systems

The cure-induced phase separation processes of various thermoplastics(TP)-modified thermosetting systems which show upper critical solution temperature (UCST) or lower critical solution temperature (LCST) were studied with emphasis on the temperature dependency of the phase separation time and its potential application in the cure time-temperature processing window. We found that the phase separation time/temperature relationship follows the simple Arrhenius equation. The cure-induced phase separation activation energy E _a(ps) generated from the linear fitting of the Arrhenius equation is irrelevant to the detection means of phase separation time. We also found that E _a(ps) is insensitive to TP content, TP molecular weight and curing rate, but it changes with the cure reaction kinetics and the chemical environment of the systems. With the established phase separation time-temperature dependence relation, we can easily establish the whole cure time-temperature transformation (TTT) diagram with morphology information which is a useful map for the TP/TS composites processing industry. __________ Translated from Acta Polymerica Sinica (China), 2007, (8): 725–730 [译自: 高分子学报]     

力／触觉再现虚拟现实系统的实现方法研究

力／触觉再现技术通过提供给操作者作用力的感觉,极大地增强了虚拟现实系统的真实感,并且拓展了虚拟现实技术的应用领域。该文论述了由力／触觉设备、操作者和计算机仿真环境组成的力／触觉再现虚拟现实系统体系结构,分析了系统实现过程中需要着重注意的系统稳定性问题,包括操作系统引入误差、作用力计算刷新率和速度估算等。最后,结合Delta力／触觉设备,实现了基于PC机的力／触觉再现虚拟现实原型系统并进行了实验。对于力／触觉再现的深入研究具有指导意义。