In Situ Synthesis of Nanocrystalline Intel-metallic Compound Layer during Surface Mechanical Attrition Treatment of Zirconium

THE FABRICATION of the nanocrystalline(NC)surface layer on bulk metallic materials has beenattracting rapidly increasing interest because excitingnew mechanical and physical properties can beexpected.A recently developed technique,the surfacemechanical attrition treatment(SMAT)[1],has shownto be capable of generating the NC surface layer invarious metals and alloys[2-5].This kind of surfacenanocrystallization is achieved through creatinglocalized severe plastic deformation,leading toco…     

Impact toughness and fracture toughness of austempered ductile iron

1.IntFOdUction AustemPered Duetile Iron(ADI)15 a relatively newmaterial in east alloy family.Its mierostrueture eonsists ofaeieular ferrite in a high earbon austenite matrix ealledausferrite.This very fine mierostrueture offers     

长江重要堤防隐蔽工程2000至2001年度第一、第二批项目设备采购及施工开标

20 0 0年 10月 6日 ,长江重要堤防隐蔽工程 2 0 0 0～ 2 0 0 1年度第一批项目设备采购及施工开标 ,数百名前来投标的施工单位代表及有关人员目睹了开标的全过程。开标活动由湖北长江招投标有限公司主持、,本着公平、公开、公正的原则 ,长江委招标办、稽查办、监察局派员对开标过程进行监督 ,武汉市公证处进行了公证。此次开标共计湖北洪湖监利长江干堤加固工程、湖北粑铺大堤樊口大闸加固工程土建及安装、樊口大闸金属结构及机电设备采购 3个项目 4个标段 ,当天吸引了来自全国各地的 90余家施工企业前来投标 ,场面十分火爆。2 0 0 0年 11月 …     

Separation of indium(Ⅲ),gallium(Ⅲ),and zinc(Ⅱ) with Levextrel resin containing di(2-ethylhexyl) phosphoric acid (CL-P204):Part Ⅱ.Mechanism and kinetics of adsorbing indium(Ⅲ)

The mechanism of adsorbing indium(Ⅲ) from sulfate solutions with CL-P204 Levextrel resin containing di(-2-ethylhexyl) phosphoric acid was examined by batch operation and infrared spectra. The results showed that the P204 adsorbed on the resin behaved in the similar way to solvent extraction except that it was as a monomer in resin adsorbing but in dimeric form in solvent extraction. Three factors including temperature, indium(Ⅲ) concentration of solution, and the size of resin particles which influence the In3 /H exchange on CL-P204 Levextrel resin were investigated by the modified limited batch technique in order to determine the kinetics of In3 /H exchange. It was found that the rate of ion exchange increased with the temperature and the concentration of solution increasing and with the size of the resin particles decreasing. According to the expression developed by Boyd et al, the controlling factor of In3 /H exchange on CL-P204 Levextrel resin was the diffusion through the resin particles. The     

Morphology Simulation for Ion-Assisted Deposition Process

THE PLASMA PROCESSING and technology[1-5]iswidely used in the semi-conductor fabrication for avariety of applications including sputtering,etching[6]and implantation[7].The main feature of these plasmaapplications is the utilization of highly energeticparticles,usually the ioned gases,to bombard thedestined target.However,there is an incidental effectcalled bombardment damage.To avoid this damage,the energetic ion must be careful processed in theassistance of the film growth with contro…     

Surface Modification of PVD-TiN Films Using MEVVAIon Implantation

IN severe working and operating conditions tin filmsfabricated by conventional methods may also fail.Therefore,the investigations were towards furthersurface treatments,aiming at modifying the wearresistance of TiN films.Among the post surfacetreatment methods,MEVVA ion implantation hasshown to be particularly promising for surfacemodification|2l Some studies have shown that the wearand friction of implanted TiN films were improved afterMEVVA ion implantation,irrespective of the type ofi…     

精彩暑期,游戏为伴——体验“力反馈”技术

现代游戏除了引人入胜的情节外,特别注重给玩家营造一个逼真的环境氛围,诸如“EAX环境音效”、“三维立体贴图”、“全屏抗锯齿”等新技术的运用使得游戏的声光效果登峰造极。与此同时,游戏周边设备也进行着深刻的技术革命,从而让玩家获得更真实的游戏体验。“力反馈”技术就是其中最具代表性、能真实模拟游戏情境的交互式多媒体技术之一。