Zr-4合金板α相高温区轧制的织构演化

用(0002)正极图和织构取向因子等方法,研究了a相高温区沿原板材的轧向和横向轧制63%的Zr-4合金板的织构。实验结果表明:Zr-4合金板材在a相高温区轧制后的织构与原料板材的织构有关,这是由它的形变机制决定的。Zr-4合金板在a相高温区轧制时,{10`11}<`2113>和{11`21}<`2113> 锥面滑移是主要的形变系统,所以轧制后形成基极取向集中于轧面法向的织构。沿原始板材的轧向进行轧制时,部分晶粒中的{`1010}<`12`10>柱面滑移开动,使轧制后的ft大于fl;沿原始板材的横向进行轧制时,{11`21}<`1`126>孪生的作用使基极沿轧面法向上的取向增强。     

退火对直流磁控溅射铬膜附着性的影响

为了利用铬膜改善锆的抗腐蚀性，研究了退火对Zr-2基体上制备的直流磁控溅射铬膜附着性的影响，使用扫描电镜（SEM）观察了界面形貌及锆，铬的界面的分布，用X－射线衍射仪（XRD）分析了膜层的组成，用划痕法测定了铬膜的附着，结果表明，锆／铬界面结合良好，边界可见；与现有文献比较，获得的铬膜附着性好――均超过20N；溅射后退火使Zr-Cr界面更像扩散界面，但X－射线衍射结果未发现有界面反应产物；退火提高铬膜与Zr-2基体的附着性约50％，扩散际着附着性增加的主要因素。     

机械的可靠度分析

通过对机械失效的分析，讨论了机械失效对可靠度的影响，提出了机械工作可靠度在设计时的计算方法和在设计时应采取的措施。     

Evaluation of Fracture Toughness of Al-Cu-Fe-B Quasicrystal

1　IntroductionTheapplicationsofthequasicrystals (QCs)haveal waysbeenemphasized ,astheyhaveaseriesofunusualphysicalandchemicalproperties (forexample ,highhard ness ,lowsurfaceenergyandfrictionalcoefficient) ,result ingfromitsaperiodicalstructure .Manystudies[1-3 ] indi catedthatmostQCsareverybrittleatroomtemperatureandveryeasilytobefracturedevenifhavingverysmalldeformation .Athightemperature ,Al Cu TMQCs (TM =Fe B ,Cr ,Si)showahighplasticityaftercompressiontesting .ForAl Cu FeQCs ,asm…     

HT-7U装置主机短路检测系统设计

本文介绍了国家大科学工程HT-7U核聚变实验装置主机短路检测系统的设计与实现。描述了系统的硬件组成、软件设计原则，流程图以及网络通讯。并阐述了有关的抗干扰技术。     

Microsoft .NET Framework结构解析

Microsoft.NET Framework是构造、配置和运行下一代XML Web服务和其它应用的核心组件。文章详细分析了NET Framework的体系结构,重点阐述了其跨语言、跨平台的特点。借助.NET Framework,可实现各种语言的无缝综合,从而可以方便地构建基于Internet标准的松散耦合的Web服务。     

Parameterized fuzzy operators in fuzzy decision making

The basic operations of fuzzy sets, such as negation, intersection, and union, usually are computed by applying the one‐complement, minimum, and maximum operators to the membership functions of fuzzy sets. However, different decision agents may have different perceptions for these fuzzy operations. In this article, the concept of parameterized fuzzy operators will be introduced. A parameter α will be used to represent the degree of softness. The variance of α captures the differences of decision agents' subjective attitudes and characteristics, which result in their differing perceptions. The defined parameterized fuzzy operators also should satisfy the axiomatic requirements for the traditional fuzzy operators. A learning algorithm will be proposed to obtain the parameter α given a set of training data for each agent. In this article, the proposed parameterized fuzzy operators will be used in individual decision‐making problems. An example is given to show the concept and application of the parameterized fuzzy operators. © 2003 Wiley Periodicals, Inc.     

一种基于神经网络集成的规则学习算法

将神经网络集成与规则学习相结合，提出了一种基于神经网络集成的规则学习算法．该算法以神经网络集成作为规则学习的前端，利用其产生出规则学习所用的数据集，在此基础上进行规则学习．在UCl机器学习数据库上的实验结果表明，该算法可以产生泛化能力非常强的规则．     

一种基于SPKI的匿名支付方案

SPKI is a proposed standard for public-key certificates. One important property of SPKI is that SPKI is key-oriented rather than name-oriented, and the public-key is globally unique. In this paper we propose an anonymous paymentscheme based on SPKI aiming at the problem of anonymous payment in B2C e-commerce. In the scheme we use the key-oriented characteristic of SPKI to link the public key to the account, and use authorization certificates to pay. The scheme achieves the anonymity very well.     

基于Notes的OA系统的通用设计方案研究

文章主要研究了基于LotusNotes的办公自动化系统的通用设计方案及整体框架,并且详细阐述了以工作流为基础的系统功能模块、数据组织模式、系统运行方式以及保证系统安全的一系列相应措施。