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.     

冰淇淋风味、营养和保健添加物探讨

冰淇淋风味、营养和保健添加物探讨杨湘庆，沈悦玉，宋春发（天津商学院，３０００００，天津）（天津裕元饮料食品厂，３００１２２，天津）冰淇淋的发展历史，虽然各家说法不一，但基本一致的观点如下：１）我国唐代已有类似冰棍的“御冰”，６２７～６４９年间，唐皇李...     

混沌信号的主要测量特性分析

初步分析了混沌信号(以Logistic为例)应用于测量中的主要特性。仿真分析了Logistic信号的频谱特性、相关特性、模糊函数。说明了混沌信号在具有较高的距离速度分辨力,同时具备强抗干扰性。对比分析了混沌码和伪随机码的多普勒容限能力。初步分析Logistic信号的抗干扰特性。