超高压下CsBr的结构与相变

采用金刚石对顶压砧高压装置（DAC）、同步辐射X光源和能散法，对CsBr粉末样品进行了原位高压X光衍射实验，最高压力115GPa。观测到在53GPa左右压力下，CsBr的最强衍射峰（110）劈裂成两个峰，标志简单立方结构向四方结构的转变；在0至最高压力范围内（相应于V／V0为1至0.463)测量了晶轴比c/a；在115GPa内未观测到样品的金属化现象。     

Dynamic Current Sharing in Paralleling Power MOSFET

By combining the theory with the practice,the dynamic current shar-ing in paralleling power MOSFET is analysed.The principles of choosing parameters in-fluencing dynamic current sharing are described,and some experiment results are given on the basis of these steps.     

植物蛋白系列冰淇淋

植物蛋白系列冰淇淋刘忠义，卢其斌，曾虹燕，谢放华（湘潭大学湘潭，４１１１０５）０前言冰淇淋是一种用奶油和脱脂乳作为要原料，配以其它辅料，经溶解、杀菌、均质、老化、搅拌凝冻、灌装、冻结成形等工序加工出来的优质冷食品，营养丰富，口感细腻，四时宜食。由于我...     

托板控制下开采沉陷的阶段性和板裂性

本文以四川杉木树矿山区开采为例，介绍了采场上方厚硬岩层对开采沉陷的托板式控制作用，分析了一级、二级托板控制作用下开采沉陷所呈现的阶段性特征及地表裸露基岩的板裂性特征。     

RADIOACTIVE OR NATURAL TRACER。TECHNIQUES FOR LEAK DETERMINING OF DAM ABUTMENT

Infiltration and localization of preferential infiltration zones at the dam abutment are measured using radioactive tracer tests of flow in boreholes,meanwhile interconnection between boreholes and the energing water points is analysed.The theory and practice of radioactive tracer synthetic detective method are described to give methods and calculation formulae used under the condition of stable flow in single well to measure permeability coefficient and hydrostatic heads.Major single hole techniques including measurement for seepage line,velocity,rate of seepage flow and relationship of recharge of groundwater in aquifers are introduced briefly.The possibilities offered by natureal tracers are analysed,uincluding electric-conduct,pH-value and temperature of water as well as stable isotopes(D,^18O) and tritium.Furthermore,the sensibilities of this theory and methods were confirmed by detecting seepage flow field of Xinanjiang Dam.