低负荷维氏硬度法的负荷选择

本文按照维氏硬度测定的技术条件,将基本公式H_v=1854P/D~2加以变换,从而得到一些较为简单的数学关系式.利用这些关系式,可以对不同金属薄带材料,很容易计算出较合理的负荷大小,既能保证不被"打穿",也使视场内有一个适合观测的压痕图象.     

CAD与CAPP集成研究回转体类零件特征识别

本文研究了回转体轴类,轴套类零件的特征识别。对这类零件常用的特征单元进行了定义,描述了这类零件的特征模型:介绍了它的识别方法和特征参数定义方法。     

RFID技术在智能交通管理中应用

本文主要介绍RFDI技术定义及系统工作原理,并重点关注RFID技术在智能交通领域的实际应用方式。同时RFID技术也成功解决了车辆自动识别和信息采集问题,为智能交通管理和服务系统的建立提供了强大的信息支撑和保障。     

磁性材料产业现状与展望

介绍磁性材料的主要品种，如永磁体、软磁体和磁记录介质材料的行业现状及技术进步。     

Surface morphology and nodule formation mechanism of cellulose acetate membranes by atomic force microscopy

By the use of atomic force microscopy (AFM), formation mechanism of nodular structure in cellulose acetate membranes was systematically investigated. Elementary factors affecting the nodule formation were delineated on the basis of both kinetic and thermodynamic considerations. It was shown that (1) the exact nature of nodular structure is thermodynamic equilibrium glassy state; nodular structure will vanish in the rubbery state; (2) the thermodynamic factor affecting nodule formation is the membrane formation temperature; with the membrane formation temperature decreasing, more chain segments are able to form nodular structures; (3) nodule formation is dependent on the segment rearrangement; variation of the solvent environment is the major kinetic factor affecting the segment rearrangement and nodule formation. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 88: 1328–1335, 2003     

添加物对ZrO2系快离子导体烧结性能的影响

本文介绍了１３２０℃下，ＣａＯ，Ｙ２Ｏ３等稳定剂，低融物组成及１－６价阳离子化合物对ＺｒＯ２烧结性能的影响并列举出材料的晶型及某些主要性能。     

Mathematical model of deoxidization with post stirring in a combined blowing converter

Dissolved oxygen in the steel at the terminal of the converter smelting process is the main cause for the formation of oxide inclusions, and the high terminal oxygen content worsens the steel cleanness. However, post stirring in a combined blowing converter can promote the carbon-oxygen reaction in the liquid steel and reduce the dissolved oxygen content at the terminal of the converter smelting process. Thus, the mathematical model of deoxidization in the post stirring process was obtained, and the rationa...     

基于NIOSⅡ的数字电子钟设计与实现

以NioslCycloneEPIC20F400C7开发板为硬件平台,利用OuartusⅡ、SOPCBuilder和NiosⅡIDE软件设计来实现一个基于SOPC的多功能数字电子钟,该电子钟系统由FPGA部分（包括Nios11CPU核、内部定时器、Avalon总线等）、存储器部分（包括SRAM、FLASH）和外围元件部分（按键、LCD显示器）三大部分构成,经过C语言编程使该电子钟具有能够在液晶屏上显示帮助信息,具有时问、日期、状态提示的功能,并可利用4个按键对时间（小时和分钟）、日期（年月日）进行设置（包括退出设置）。经测试该电子钟具有较好的时间精度。