32例后房型人工晶体植入术临床分析

３２例后房型人工晶体植入术临床分析兰化医院眼科孙宏忠，王永昌，张永莲近年来，随着眼科显微手术的逐渐开展，后房型人工晶体植入手术在我国已开展应用，人工晶体植入治疗白内障，具有恢复视力快，物象放大率好和周边视野正常等显著优点。我院从１９９２年３月至１９９...     

Delphi 中 Windows 系统注册表的应用

目的　研究 Delphi软件开发环境对 Windows系统注册表的支持 .方法　分析 Windows系统注册表及使用 Delphi操纵 Windows系统注册表 .结果　给出使用 Delphi操纵 Windows系统注册表的一些成熟范例和程序代码 .结论　应用程序可以通过对 Windows系统注册表的灵活应用提供丰富的功能     

电力工程中电气自动化技术的运用分析

我国的电气自动化专业在上个世纪五十年代就开设了,最开始的名称是工业企业电气自动化,经过多次的调整,拓宽了其专业面,也增加了其实用性,这就使得电气自动化在电力工程中应用越来越广泛。本文先分析了电子自动化概述,接着从微电子技术、全控型电力电子开关、变化器电力的发展、交流调速控制理论的成熟这几个方面对电子自动化技术的运用做了分析。     

Rare earth ceramic cutting tool and its cutting behavior when machining hardened steel and cast iron

The addition of rare earth element yttrium played an important role in the improvement of both mechanical properties and wear resistance of Al2O3/(W,Ti)C ceramic cutting tool material.Mechanical properties especially the fracture toughness and flexural strength were obviously increased when a suitable amount of the yttrium were added.Wear resistance of the developed rare earth ceramic cutting tool material was higher than that of the corresponding materials without rare earth in the machining of the hardened 45# carbon steel and cast iron HT20-40.Wear modes of the Al2O3/(W,Ti)C rare earth ceramic tool materials were mainly flank wear and crater wear accompanied with slight notch wear when machining the hardened carbon steel.Wear mechanisms were major abrasive wear at low cutting speed and adhesive wear at high cutting speed.Wear modes were nearly the same except that the adhesion phenomenon in the crater area was intensified when machining cast iron.The flank wear area was relatively smooth with no obvious plowing phenomenon which was possibly concerned with the workpiece of low hardness and the adhesion phenomenon at high cutting temperature.     

多元梯度自润滑陶瓷刀具材料的研制

针对均质自润滑陶瓷刀具材料不能合理兼顾减摩性能及耐磨性能的难题,运用功能梯度材料的设计思想研制出一种梯度自润滑陶瓷刀具材料。这种新型自润滑刀具材料的特征是固体润滑剂由其表层向内层梯度减少,并且材料表层存在残余压应力。提出多元梯度材料的组成分布模型,按该模型得出的组分梯度设计结果,采用粉末叠层铺填与真空热压烧结工艺制备Al2O3/TiC/CaF2梯度自润滑陶瓷刀具材料。该梯度自润滑陶瓷刀具材料的显微结构呈现出与组成分布一致的梯度变化,表层形成了残余压应力,其抗弯强度、硬度和断裂韧度分别比相应的均质材料提高了21%、16%和5.9%。材料强度的提高主要是由于CaF2由表层到中间层梯度减少,硬度和断裂韧度的提高归因于材料表层的残余压应力。以Al2O3/TiC/CaF2梯度自润滑陶瓷刀具和相应的均质自润滑陶瓷刀具对45钢进行干切削试验,结果表明,梯度刀具的耐磨性能优于均质刀具。     

一种快速的多媒体视频解码算法

目的找出一种对多媒体视频流的快速解码方案. 方法对多媒体信息流的编码解码过程进行剖析, 提出粗跳、细跳算法定位视频流中的I图像. 结果找到了一种快速搜索I图像的算法.结论多媒体信息流的解码可以用较快的算法实现, 从而提高解码速度、节省解码用时间.