采用前驱体法合成了钙钛矿型B位离子氧化物固溶体,以此作为B位先驱体与碳酸铅通过固相反应在740℃合成A位缺铅的亚稳态钙钛矿型锆钛酸铅(PZT)固溶体.烧结过程中纳米级四方和单斜ZrO2纳米粒子从固溶体中析出.借助X射线衍射仪、扫描电镜和透射电镜对物相、组成和微观结构进行了分析.随ZrO2的加入量增加,断口从沿晶穿晶混合断裂变为穿晶断裂.研究表明,采用聚合物B位前驱体法成功制备出内晶型锆钛酸铅纳米复相陶瓷

本文研究了新型高磁能铁铬15钴-2钼-0.5钛柱晶永磁合金。该合金最佳磁性为:Br=14900高斯,Hc=680奥斯特,(BH)m=7.4×106高奥,达到了国内先进水平。在扬声器、测振仪传感器、电表、自动控制仪表上试用效果良好。研究了添加元素钼、钛、硫对磁性及柱晶的影响,发现添加钼未增加磁晶各向异性,而回火则大大提高合金的单轴各向异性。本文研究了柱晶合金斯皮诺达分解产物α1相的形貌和分布与热处理工艺的关系,给出了透射电镜照片

1. Information Processing Definition of Information processing All operations exerted to the information itself for its better utilization Information processing is necessary because most of the information in its original form may not be good for use. Thus information processing is the basis of later operations Two categories of information processing: 1)Shallow Level of Information Processing 2)Deeper level of Information Processing

Nationality: German. Born: Helma Sanders in Emden, Germany, 20 By SANDERS-BRAHMS: articles- November 1940: added her mothers maiden name to her own to differentiate herself from another New german Cinema filmmaker Helke Sander. Education: Studied acting in Hanover, Germany: Misunderstood Mother and Forgotten Father. interview with g studied drama and literature at Cologne University Career: Worked

HAANSTRA. Bert 1952 Dijkbourw( Dike Builders)(+ sc, ed) 1954 Ont staan en vergaan (The Changing Earth)(+ sc); De Nationality: Dutch. Born: Holten, Holland, 31 May 1916. Educa- opsporing van aardolie (The Search for Oil)(+ sc); De tion: Academy of Arts, Amsterdam. Career: Painter and press erkenningsboring(The Wildcat)(+ sc) Het olieveld (The Oilfield)(+ sc) photographer, from late 1930s; joined

2.1误差来源及其分类 2.2误差的表示方法 2.3随机误差的估算 2.4粗大误差的判断准则 2.5系统误差及其减小方法 2.6测量数据的处理 2.7误差的合成与分配 2.8最佳测量条件的确定

1概述 2频谱分析仪的工作原理 3频谱分析仪性能参数的基本概念 4频谱分析仪的测量准确度 5频谱分析仪使用中应注意的问题 6频谱分析仪使用实例一E4405B

Michelle Banks, Erin Bealmear, Laura Standley Berger, Joann Cerrito, Jim Craddock, Steve Cusack, Nicolet V. Elert, Miranda H. Ferrara, Kristin Hart Melissa Hill, Laura S Kryhoski, Margaret Mazurkiewicz, Carol Schwartz, and Christine Tomassini, St James Press Staff laria Franklin, Permissions Manager Debra J. Freitas. Permissions assistant Mary Grimes, Leitha Etheridge-Sims, Image Catalogers

本文对电镀锡和含64～76%Sn的铅锡镀层的铜导线进行了铜锡金属间化合物生长速度的研究。在100±1℃和155±2℃的温度下,经不同的老化时间后测定了化合物层的厚度,并得到了化合物生长厚度与时间、温度的关系式。实验测得在共晶成分附近的铅锡镀层其化合物生长速度快于纯锡镀层。引线在室温下放置近一年未发现可见的化合物层。本文还讨论了剩余镀层厚度与引线可焊性的关系

本文提供了应用电子计算机进行星轮系齿数选择的方法。文章介绍了齿数选择电算法的基本原理、框图、程序及计算实例,比较完满地解决了2K—H行星轮系（非变位齿轮）的齿数选择问题