Development of grain boundary allotriomorphic ferrite/granular bainite duplex steel

A new hot-rolled low alloy high strength steel with grain boundary allotriomorphic ferrite/granular bainite duplex micro-structure has been developed through novel microstructure and alloying designs without any noble metal elements such as nickel and molybdenum. Its as-rolled microstructure and mechanical properties, fatigue crack propagation behavior compared with single granular bainitic steel as well as continuous cooling transformation, were investigated in detail. The measured result of CCT (continuous cooling transformation) curve shows that such duplex microstructure can be easily obtained within a wide air-cooling rate range. More importantly, this duplex microstructure has much better combination of toughness and strength than the single granular bainite microstructure. It is found that the grain boundary allotriomorphic ferrite in this duplex microstructure can blunt the rni-crocrack tip, cause fatigue crack propagation route branching and curving, and thus it increases the resistance to fati     

A general simulation model developing process based on five-object framework

0　INTRODUCTIONAsimulationmodelisarepresentationofthecon structionandworkingofsomesystemofinterestandtheresultisoftenusedfordecisionmaking .Ifthesimulationmodelisnotanaccuraterepresentationoftherealsystemitwillresultinsignificantfinancialorsocialcosts .Thepeopleaffectedbydecisionsbasedonsuchmodelsareallrightlyconcernedwithwhetherthemodelanditsresultare“correct” .Thisconcernisaddressedthroughmodelverifi cationandvalidation[1] .Differentparadigmsthatrelateverificationandvali dationtosimul…     

Decentralized adaptive output regulation for a class of large-scale nonlinear systems

We address the output regulation problem for a class of large-scale nonlinear systems with a neutrally stable uncertain exosystem via a decentralized error feedback adaptive control strategy.     

HL-2A Tokamak Edge Modeling with B2

The outer divertor plasma of HL-2A and its associated scrape-off plasma have been simulated using a two-dimensional multi-species fluid code of Braams with a simplified neutral gas model. HL-2A has a double-null closed divertor in separate divertor chambers above and below the nearly circular plasma tours. The computed numerical grid is developed according to an ideal magnetic surface. The calculation is involved only with pure hydrogen plasma. The emphasis has been focused on parametric studies involving variation of the assumptions made for the core plasma. The peak temperatures and the heat flux near the target are of the principal concern。     

逆向云在定性评价中的应用

现有的定性评价存在主观性和随意性大的缺点，缺乏客观性和精确性,云模型是一种定性与定量之间相互转换的有效工具，逆向云可以实现定量数值与定性概念的自然转换，从而得出一个用精确数值表示的定性概念．该文分析并给出了逆向云发生器的具体算法，并对还原的各特征值进行了误差分析．最后将该算法应用到射击评判上，评价结果不仅有射击准确度的评价，而且有运动员心理素质的分析，比仅仅用环数来评价一个运动员更准确、更具体．     

一种新型的大功率电镀电源

国内生产的１０００Ａ以上的晶闸管与同容量二极管的价格相近，采用晶闸管研制出一种整流和控制结合为一体的大功率电镀电源，打破了传统的整流和控制分离而使用两种半导体器件及两种电磁部件的方法．这种新型的大功率电镀电源的特点是造价低，输出电流能力强，可靠性高，控制特性好且能量损失小．     

居住区环境设计新思维初探──跨世纪住宅设计竞赛的思考与研究

本文结合’96上海国际住宅设计竞赛方案，就居住区环境设计的理论与方法进行了探讨。     

空气离心式离合器主要结构参数的确定

以传递和扭矩和工作转速为设计条件，推导并建立了空气离心式离合器的承载能力方程式及其求解方法，并在此基础上提出了确定该种离合器主要结构参数的具体设计方法和步骤。使其更便于在实际中推广和应用。     

简论产品定价法

随着社会主义的不断完善，在企业的经营决策中，产品的价格确定是一个十分重要的内容．售价决策正确与否，直接关系到企业经济效益的好坏．本文对产品定价的方法作一探讨，试图找到一种对企业来说比较实用的方法．     

基于局部域拟合的二维数据生成

1 引言 在图像处理中,常利用内插与外推方法从若干已知象元的数据(线性或非线性)组合,生成邻近的一个象元数据的估值,以代替实际值便于进一步处理.如常见的平滑去噪[1]和相关预测[2],其主要特点是用多点数据生成一个估值.然而,如何从多点数据一次生成多点数据,并且要求所生成的数据与原数据分布一致且连续.例如在对电影胶片检测时[3],因某种缘故胶片有损,缺损的像元往往是几十个甚至几百个以上的连同区域,用上述的多点对一点的估值方法是无法弥补图像的缺损,需要用其他方法.文献[4]利用前后幅图像的相关性,对当前图像进行插值计算,以补充缺损部位的数据.其中还考虑到运动估值的问题.