Microstructures and evolution mechanism of highly undercooled Ni-Pb hypermonotectic alloy

The microstructures and evolution mechanism of the undercooled Ni-20%Pb(molar fraction) alloy were investigated systematically by high undercooling solidification technique. The experiment results indicate that the morphology of α-Ni phase and the distribution of Pb element in undercooled Ni-20% Pb alloys change with the in-crease of undercooling. The main evolution mechanisms of α-Ni are dendrite remelting and recrystallization. Pb phase in the microstructure of Ni-20% Pb hypermonotectic alloy originates from L2 phase separated from the parent melt during the cooling process through immiscible gap and L2 phase formed at the temperature of monotectic trans-formation. The solubility of Ph element in α-Ni phase under high undercooling condition is up to 5.83% which is ob-viously higher than that under equilibrium solidification condition. The real reason that causes the solubility difference is distinct solute trapping.     

BCD智能功率集成技术简述

简述了BCD智能功率集成技术的构成及其特点,着重介绍了现阶段BCD智能功率集成技术在国内外的发展状况,以及其在军事领域中的广泛用途,简单介绍了BCD智能功率集成技术的未来发展方向以及研究BCD智能功率集成技术的重要性。     

THE AUTOMATIC CRYSTALLIZATION OF MgO DURING THE SINTERING Si_3N_4-MgO-CeO_2 CERAMICS

The automatic crystallization of MgO duringthe sintering of Si_3N_4-MgO-CeO_2 is first discovered.ForSi_3N_4-MgO-CeO_2,ceramics,the MgO-CeO_2 would reactwith SiO_2 to form liquid at 1450℃ and then transform intoglassy phase in the sintered bodies after cooling down.Above1550℃,MgO would crystallize automatically during sinter-ing.So the glassy phase which is harmful to the high temper-ature properties is then eliminated.The present work is ofgreat value for theoretical study and application.     

天然气供暖方式与天然气的高效利用

本文分析了天然气供暖方式及其特点,探讨了天然气高效利用的途径、烟气热能利用的技术关键、天然气利用设备的发展趋势及既有天然气锅炉房改造方案。     

当前引进热处理设备的国产化途径

在社会主义市场经济条件下,通过热处理协会中介协调,以及引进、消化、吸收国外先进技术,以实现引进设备国产化,并结合国情加以创新。     

钙基复合固硫剂硫化特性的热重研究

利用热重分析方法研究了钙基固硫剂的硫化反应特性，对影响钙利用率的几个因素进行了探讨。表明添加剂的加入改善了ＣａＯ的高温固硫性能，提高了固硫产物的热稳定性，使最佳固硫温度向高温区移动约１００℃，热分析条件下钙利用率达６５％。     

国际招标项目土建标书的筹划和编写

本文通过介绍作者参与的一部分国际竞争项目的招投标文件的编写工作,总结了国内外招标文件技术部分的各自特点及差异,阐述了火力发电厂项目的土建技术标书的编写模式、通用和特殊技术要求部分的编写要点及对编写同类型标书文件的一些借鉴意义。     

Java语言国际化的设计与实现

指出本地化的缺点.深入分析了Java语 言的内部编码,设计并实现了支持国际化的编译器,采用字符编码转换的方案,使多语种字符 、字符串的操作达到了与英文字符、字符串完全一致的目标,并节省了类文件的存储空间,也 使程序具备了有条件的字符集无关性,在一定程度上解决了“万码奔腾”的问题.采用编译信 息和与语境无关的程序代码分离的方案解决了提示信息的国际化问题.提出了采用小字库方 案来解决含有本地字符的程序的真正跨平台问题.通过在加载类时采用对类名进行字符编码 转换的方案解决了JDK(Java development kit)所未能解决的含有本地字符的类名的支持问 题;针对JDK不同版本间的兼容性问题,提出采用根据字符编码特点来选用不同编码转换机制 的解决方案.测试结果证明,采用所设计的国际化方案可实现彻底的国际化支持.     

生活废热水余热利用的实验研究

理论研究显示,以生活废热水为热源的热泵热水器比空气源热泵热水器有更好的节能效果和更广的应用区域,但对非公共浴室的生活废热水源热泵热水器的实践研究和应用仍较少。以仲恺农业工程学院学生生活废水的使用和排放情况为基础,设计了可用于家庭、集体宿舍和宾馆房间的户式生活废热水源热泵热水系统,并模拟多种运行工况进行了实验研究,为生活废热水源热泵热水器的工程设计提供依据。研究表明,该系统能效比高,节能效果优于其他热水加热方式。     

Simultaneous stabilization of full state information Linear Time‐Invariant systems

Single necessary and sufficient stability conditions, are presented, for a common Linear Time‐Invariant (LTI) controller that simultaneously stabilizes each of a given family of LTI plants. It is assumed that the strictly proper, lumped and LTI plants have stabilizable realizations and are strongly stabilizable, and that the state‐space dimensions of the plants do not change, are even and are double the input‐space dimensions of the plants. The stabilizing controller is designed for a nominal plant and its free parameter is fixed assuring stability for all the plants, and assuring a stable controller. The stability conditions for simultaneous stabilization are based on the parity interlacing property, on a matrix that must be unimodular and on an analytical expression of the stabilizing controllers. Copyright © 2011 John Wiley and Sons Asia Pte Ltd and Chinese Automatic Control Society