多导脑部磁刺激仪的设计与仿真

大脑神经系统可由外部的时变磁场加以无创刺激，考虑到要对大脑多个不同部位同时进行刺激的情况，提出了一种由多线圈组成的多导脑部磁刺激系统．用有限元分析软件ANSYS模拟了线圈阵列工作时所产生的磁场，并与实验测得的磁场进行了比较．结果表明，软件仿真的数据精度误差在6％以内，并总结出变化规律：随着刺激线圈个数的增加，中心线圈轴线上同位置处的磁感应强度逐渐加大，与单线圈工作时相比，磁刺激深度得到了有效改善．     

蒸发冷却+干式风机盘管半集中式空调系统探讨

在温湿度独立控制的原理基础之上，根据西北地区的气候特点，提出了干式风机盘管与蒸发冷却相结合的半集中式空调系统，并对该系统的设计过程进行了分析．实例表明，它不仅解决了目前蒸发冷却空调系统中存在的风管尺寸大、难以分室控制等问题，还比直流式全新风系统节省能耗21．9％以上．     

磁性研磨感应器电磁线圈的两种计算

对用电压线圈法和电流线圈法计算电磁线圈参数两种方法进行了比较,并建议电磁感应器的电磁线圈应尽量采用电流线圈.     

桥路型超导故障限流器的数字仿真研究

桥式超导故障限流器,它由超导磁体、二极管桥路和直流偏压源组成.将其接入电网,当电力系统正常运行时,超导体电阻几乎为零,对电力系统运行无影响;当电网发生短路故障,超导线圈被自动串入线路,从而限制了短路电流,使得轻型断路器可以正常动作.本文通过PSCAD对超导故障限流器的运行特性进行仿真,证明超导故障限流器可以在电力系统中应用.     

一种新型可连续调节的消弧线圈

采用可连续调节的消弧线圈不仅解决了高压电感调节系统的价格昂贵和调节系统十分复杂的问题，还可以使经消弧线圈接地系统的优越性充分发挥。文中着重介绍了如何采用低耐压的晶闸管连续调节6-66kV的消弧线圈的一种新方法。对新型消弧线圈的电感调节量的计算进行了理论推导，并对其产生的稳态电流谐波分量进行了分析，用Saber软件对所设计的消弧线圈的理论依据进行了仿真实验验证和实物实验验证。     

In vivo Dynamic Studies of Brain Metabolism

Nuclear magnetic resonance （NMR） can noninvasively monitor intracellular concentrations and kinetic properties of numerous inorganic and organic compounds. A ^31p NMR surface coil was used in vivo to dynamically measure phosphocreatine （PCr）, adenosine triphosphate （ATP）, and intracellular inorganic phosphate （Pi） levels in mouse brain during ischemia-reperfusion to study the damage of cerebral tissues caused by ischemia and effects of herbs on cerebral energy metabolism during ischemia-reperfusion. The study provides dynamic brain energy metabolism data during different periods. The data show that some herbs more rapidly increase the PCr level during the recovery phase than in the control group.     

Protein folding revisited. A polypeptide chain at the folding – misfolding – nonfolding cross-roads: which way to go?

The structure-function paradigm claims that a specific function of a protein is determined by its unique and rigid three-dimensional (3D) structure. Thus, following its biosynthesis on the ribosome, a protein must fold to be functional. This idea represents one of the cornerstones of modern biology. Numerous cases when, due to the effect of environmental factors or because of genetic defects (mutations), a polypeptide chain has lost its capability to gain a proper functional 3D structure (i.e. became misfolded), seem to confirm this concept. Consequences of such misfolding are well known and represent lost of function, aggregation, development of conformational disorders and cell death. However, the recent revelation of countless examples of intrinsically disordered proteins has cast doubt on the general validity of the structure-function paradigm and revealed an intriguing route of functional disorder. Thus, in a living cell, a polypeptide chain chooses between three potential fates – functional folding, potentially deadly misfolding and mysterious nonfolding. This choice is dictated by the peculiarities of amino acid sequence and/or by the pressure of environmental factors. The aim of the present review is to outline some interesting features of these three routes.Received 5 March 2003; received after revision 28 March 2003; accepted 31 March 2003     

1Cr18Ni9Ti不锈钢的双频电磁约束成形工艺参数优化

根据高频磁场利于感应加热、低频磁场利于熔体成形的特点，针对不锈钢(1Cr18Ni9Ti)密度大、熔点高和约束成形的熔体高度低等成形困难的特点，提出了利用低频磁场约束成形、高频磁场在不影响成形磁场的条件下辅助加热的不锈钢双频电磁约束成形方法，以便温度场和成形力场的最佳耦合．通过实验和理论分析，设计了不锈钢双频电磁约束成形的成形感应器和预热感应器，并确定了感应器间的距离和屏蔽罩的放置方式，研究了预热感应器对温度场的影响规律，从而建立了不锈钢的双频电磁约束成形系统．在对熔体的稳定成形分析的基础上，利用双频电磁成形系统成功抽拉出圆形不锈钢样件．     

断路器跳闸线圈烧毁的原因分析及预防

文章分析了电磁操动机构的断路器跳不开闸、跳闸线圈烧毁的原因、现象及预防措施。     

磁共振成像中磁体的匀场线圈设计与磁场计算

根据静磁场的基本特征及有源匀场的方法，分析了具有柱面形状的两类匀场线圈的结构设计与优化方法，并导出线圈磁场的高精度数值算法．以此设计的匀场线圈成功应用于超低场ＭＲＩ的０．０４Ｔ常导磁体的匀场中．