INVESTIGATION ON CRYSTALLIZATION KINETICS OF Pd-Cu-Si GLASS

The crystallization kinetics of Pd-Cu-Si glass was studied by means of diferential scanningcalorimetry-Ⅱ.According to Kissinger peak shift meth(?)d and Arrhenius equation,theapparent activation energy was calculated.The crystallization kinetics follows Johnson-Mehl-Avrami equation with n=3.0 within 0.15相似文献   

TEM IMAGING TECHNIQUE

This imaging technique is used for approximate interpretation of TEM data including ungrounded loopsource and grounded line source soundings.Loop source data can be collected as central-loop soundings or asout-of-loop soundings with a short or long offset configuration.The imaging method is based on the same princi-ple as that employed by Fullager(1989),with apparent resistivities computed directly from time-derivative data,db/d,and then associated with depths according to image theory.     

BREAKAGE MECHANISM OF TUNGSTEN BASED ALLOY BLOCK FOR ELECTRO-HEAT UPSETTING

The breakage mechanism of W-Ni-Fe alloy in the process of electro-heat upsetting studied both theoretically and experimetnally, and also the behaviors of crack formation and propagation were analysed. Alloy suffers from corrosion and thermal-mechanical fatigue mutual function. Simultaneously, the practical ways to improve the anvil life was discussed.     

CORRELATION BETWEEN STRUCTURE AND MAONETIC PROPERTIES OF AMORPHOUS Gd-Co FILMS

本文用电子衍射方法研究了非晶态Gd-Co薄膜(400—700A)的结构,测定了五个试样的径向分布函数,并把其中两个试样的径向分布函数与它们的磁性(一为垂直膜面单轴各向异性,另一为平面各向异性)联系,发现Gd-Co薄膜的垂直膜面磁各向异性可能与膜中异类原子的最近邻配位数较大有关。     

A SIMPLIFIED EXPRESSION OF m-n-δ RELATIONS FOR MATERIALS WITH PLASTICITY OR SUPERPLASTICITY

以Hart的微分型本构关系为基础,本文推导出了一个既包含应变硬化效应(n)又包含应变速率敏感效应(m)的m-n-δ关系式δ=[1/(1-(1-α(0))~(1/m))]~m×e~n-1当n=0时,它吻合于Ghosh和Ayres的现代分析,当m=0时,吻合于Considère的经典分析.该公式的计算结果和实验结果一致.     

企业漏洞扫描前应考虑的3个问题

企业漏洞扫描对于企业来说是十分重要的一个网络安全组成部分,做好漏洞扫描可以使企业网络安全程度得到很大程度的提升。但是企业漏洞扫描也是一项很复杂的工作,本篇文章就将介绍企业漏洞扫描应考虑的3个问题。     

移动安全策略制定必备五大要素

随着网络范围的不断扩大,IT部门不得不应对新的工作负担。根据Forrester公司的调查结果,全球已经有29％的企业员工以远程方式处理工作信息,他们常常利用三台或更多设备在不同地点处理日常事务,且在流程中往往涉及多种应用程序,这一状况已经引起了IT部门领导者的重视。     

Web浏览器扩展程序安全：缓解浏览器插件威胁

大多数Web浏览器用户都期望浏览器扩展程序、插件和浏览器帮助者对象（BHO）能提供一些便利。不幸的是,这些附加产品通过将组件添加到浏览器的默认功能来提高生产力的同时,也成为恶意攻击者的首要攻击目标。因为企业在修补和更新插件和扩展程序方面的能力普遍较差,所以浏览器就成为了终端最脆弱的攻击目标。对于终端环境来说,大多数企业的补丁周期是2～3个月,这个周期很长以至于企业不能及时地跟上利用浏览器扩展程序和插件漏洞的攻击组件。     

EFFECTS OF ENTRAINED AIR MANNER ON CAVITATION DAMAGE

Early in 1953 the experiments by Peterka proved that air entrainment has effects on decreasing cavitation damage.This technology has been widely used in the release works of high dams since the inception of air entrainment in the Grand Goulee Dam in 1960.Behavior,mechanism and application of air entrainment for cavitation damage control have been investigated for over half century.However,severe cavitation damage happened due to complex mechanism of air entrainment.The effects of air entrainment are related...     

发掘经济困难时期隐藏的IT机遇

今天,IT正面临史上最强的挑战。IT经理们正在承受巨大的成本削减压力,而且这种压力正随着当前严峻的经济形势而不断增加。许多研究员在近期的研究报告中指出．IT机构正在谋求减少员工人数以及他们在2009年的整体开支。为应对这一挑战,其他业务领域比以往任何时候都更加依赖IT．以求借此应对日益激烈的竞争和资金减少等情况。预算紧缩也使企业对效率寄予更高的要求。