齿轮磨前滚刀的齿形研究

本文介绍了磨前滚刀滚切齿轮的最大根切量和磨后的渐开线长度计算,并建立了数学模型。为更加直观起见,还建立了模拟滚齿的数学模型。并在实验的基础上提出了参考标准。     

Object-extending class transformations

Reorganisation and evolution of class hierarchies is important for object-oriented system development and has received considerable attention in the literature. The contributions of this paper are: (1) a formal study of a set of extension relations and transformations on class hierarchies; (2) a presentation of a small set of primitive transformations which form a minimal and complete basis for the extension relations; and (3) an analysis of the impact of these transformations at the object level.The study leads to a better understanding of evolution and reuse of object-oriented software and class hierarchies. It also provides a terminology and a means of classification for design reuse. The theory presented in this paper is based on the Demeter data model, which gives a concise mathematical foundation for classes and their inheritance and part-of relationships. Parts of the theory have been implemented in the Demeter System ^TM C++, a CASE tool for object-oriented design and programming.     

X射线衍射线形Fourier变换

采用计算机辅助实验技术，研究X射线衍射线开在仪器宽化修正过程中Fourier系数变化的规律及其影响，结果表明，只要实测线形接近Gauss 分布，Fourier变换就会导致弯勾效应；Forier变换可引起真实线形的尾部波动及大于实际值的宽化，引入边界条件可予以消除，Kα双线形经过Fourier变换后，Fourier纱数与真实Fourier系数存在着一定的差异。通过真实线形的Fourier变换可以修正。     

Temperature effects on the mass flow rate in the SBI and similar heat‐release rate test equipment

In various medium‐to‐large‐scale fire test equipments like the ISO room corner test (RC), and more recently, the single burning item test (SBI) the mass flow rate measurement of the combustion gases plays a key role in the determination of the heat‐release rate and smoke‐production rate. With the knowledge of the velocity profile and the temperature of the flow, the mass flow rate is obtained by measuring the velocity on the axis of the duct. This is done by means of a bi‐directional probe based on the pitot principle. However, due to the variation of the mean temperature and the temperature gradient in any cross section of the duct, introduced by ever changing combustion gas temperatures, the velocity nor the density profile are constant in time. This paper examines the resulting uncertainty on the mass flow rate. Copyright © 2006 John Wiley & Sons, Ltd.     

Study on axiomatic rules for building up relationships between requirement and source programs

The purpose of our study is to build up relationships between requirement and source programs with our originally thought-out rules. When other rules to be derived from these original rules are applied to software development, even a single instruction in a programming language could be determined, and the program would satisfy the requirement. More specifically speaking, these rules will turn into a formula or a prototype of software programs. Hence, when the variables in the requirement are placed in the formula, we can get a required program in an automatic way.     

田5-斜19五段制剖面定向井钻井技术

五段制剖面定向井施工难度较大，主要介绍了田5—斜19井的井眼轨迹控制、相关安全钻井及钻井液技术，并对施工中发生的复杂情况进行了分析，总结了一些经验，对五段制剖面类型定向井施工具有一定的参考价值。     

注入剖面双相态放射性测井方法研究

文章结合注入剖面同位素示踪和放射性相关流量两种测井方法的特点,提出了固态微球同位素和液态同位素同时使用的综合测井方法.应用放射性相关流量测井的直观性,量化同位素示踪测井中的不确定因素,达到提高测井成功率和资料解释精度的目的.     

铝型材推弯工艺

通过铝型材圆环的推弯实验,研究了推弯工艺原理、变形过程,结合有限元模拟得到了和实验结果相吻合的型材厚度分布、成形零件卸载回弹后的曲率半径及型材截面畸变.结果表明:推弯零件曲率及截面畸变一致性高,成形模具结构简单且便于调整,数值模拟可以用于推弯工艺的优化分析.     

基于电报编码的"电子喉"系统

本文介绍一种能够解决有语言障碍的人汉语发音问题的计算机软件系统，此系统采用电报和五笔画编码方案作为汉字输入方法，自建了一套汉字录入和检索体系，并利用Microsoft公司的Speech SDK4.0和Concatenated Text-to-Speech Engine建立了专用的语音库，本系统使得有语言障碍的人可以与其他正常人之间进行正常的交流，从而避免了使用哑语带来的不便。