机电产品面向拆卸回收的绿色设计结构模型的比较

本文通过无向图、有向图和与或图三种以图论为基础的拆卸回收模型的比较,指出了各种模型存在的优缺点,为完善面向拆卸回收的绿色设计结构模型提供依据.     

高校学籍管理系统的设计与应用

依托高校现有的数字化校园网络平台和办公自动化系统等硬软件资源,融入ASP编程技术、Web万维网技术、Access数据库技术、MIS管理信息系统、B/S开发模式等综合应用,以ASP编程技术来开发系统管理软件。通过对系统运行环镜、整体架构、数据库逻辑结构ER图的全面设计,实现对学生学籍管理相关数据的查询、修改、添加、删除等功能操作。在性能方面实现系统的全面性、可靠性、安全性、兼容性、高效性和可维护性。实验证明,系统性能稳定、功能齐全、应用效果显著,具有较高的推广应用价值。     

基于Web的B／S模式网络管理信息系统的设计与实现

随着Internet/Intranet技术的发展,基于Web的企业计算和信息管理将逐步取代传统的PC计算机和信息管理系统。本文基于Web技术,在Internet/Intranet上为襄樊某设计院(以下简称设计院)设计与实现了管理信息系统,该系统以B／S模式实现数据信息的管理,具有简洁、高效、使用方便等特点,具有良好的可扩充性、可维护性。     

电器实验系统网络架构及其通信技术开发

为了克服传统电器实验室系统的不足,构建了基于真实实验设备的网络化电器实验系统.该实验系统分为客户端、服务器端和现场设备层3个部分,采用UDP自定义协议及MODBUS/RTU协议实现客户端与服务器、服务器与现场设备之间的通信.文章最后还介绍了温升实验在网络化实验平台中的应用.     

MEASUREMENT OF THE DIELECTRIC PROPERTIES OF BIOLOGICAL TISSUE

An open-ended coaxial line reflection method especially suitable for meas-uring the dielectric properties of biological tissue in vivo is described.This method offersthe advantage of not requiring any special preparation of the samples to be measured but aclose contact with the open end of a coaxial line.It is,therefore,very convenient to acquirea large number of measurement data in broad band rapidly.The method may also be usedto measure the properties of other substances.The measuring system consists of a networkanalyzer controlled by a microcomputer and calibrated by using ANA procedure to elimi-hate the influnce of error network introduced by the adapter,some connectors,etc.In or-der to reach higher accuracy,the iterative method is used to determine the parameters ofthe equivalent circuit.Measurements of permeativities of some living tissues have been per-formed in the frequency band of 0.5-2GHz.Compared with the results known in somepapers,the validity of this method has been confirmed.The difference in dielectric proper-ties between living and dead tissues,and the tissue permeativites(ε)versus frequency andduration of measurement after death have also been measured.     

Role of CD97stalk and CD55 as molecular markers for prognosis and therapy of gastric carcinoma patients

Objectives: To explore the mechanism of development and aggressiveness in gastric carcinomas by investigating the expression and role of CD97 and its cellular ligand CD55 in gastric carcinomas. Methods: Tumor and corresponding normal mucosal tissue, collected from 39 gastric carcinoma patients, were examined by immunohistochemistry and RT-PCR for the expression of CD97 and CD55. Results: CD97stalk was strongly stained on scattered tumor cells or small tumor cell clusters at the invasion front of gastric carcinomas. The expression of CD97stalk was frequently observed in tumors of stage Ⅰ and T1 gastric carcinoma patients. The expression of CD97stalk between Stage Ⅰ and Stage Ⅱ, Ⅲ, Ⅳ specimens showed significant difference (P＜0.05), between T1 and T2, T3, T4 specimens also showed significant difference (P＜0.05). Specimens with tumor invasion depth limited in mucosa of T 1 specimens showed higher positive CD55 expression than specimens with the same tumor invasion depth in T2, T3, T4 specimens, the expression of CD55 between T1 and T2, T3, T4 specimens was significantly different (P＜0.05).There was strong correlation between the distribution patterns of CD97stalk and CD55 on tumor tissues (r=0.73, P＜0.05). Signet ring cell carcinomas frequently contained strong CD97stalk and CD55-staining. Conclusions: Our results suggest that CD97stalk is probably involved in the growth, invasion and aggressiveness of gastric carcinomas by binding its cellular ligand CD55. CD97stalk and CD55 could be useful as molecular markers for prognosis and therapy of gastric carcinoma patients.     

Pro/ENGINEER常见问题解答

本文主要针对Pro/E学习中常见、易混淆的问题,以问答的形式做了较详细的解答,旨在帮助大家更快地掌握软件的使用。     

K/T界线的研究进展——兼论元素演化与恐龙灭绝的可能关系

本文通过总结近一、二十年来K/T界线的研究进展和恐龙绝灭的相关假说，认为前人在K/T界线和恐龙灭绝的研究方面确实取得了很大的成果，但同时,大多数的研究都是集中在对灾变大环境的求证上。只有少数学者注意到Co、Cr、Ni、Mn、V等这些在界线处变化较大的元素同时也是生物必需微量元素，而另外一些异常元素（如REE、Pb、Sr等）也可能对生物的正常生理机能产生重要影响，这些元素的异常变化很可能与恐龙灭绝存在着一定的关系，但这方面的系统研究还相当缺乏，今后应加强元素的生物机能和与生命活动密切相关的元素在K/T界线附近的演化与恐龙灭绝的关系等方面的研究。     

我国内容产业资源整合及发展趋势

内容产业作为信息社会的一个新亮点在我国开始流行。文章讨论了我国内容产业资源整合的必要性以及存在的困难，提出了对资源的各个方面进行整合的策略，并介绍了当今国外内容产业的发展势态。     

大学图书馆读者阅读素质教育研究

阐述了读者阅读素质的涵义,并从大学图书馆读者阅读素质教育中存在的问题和阅读素质教育的意义、原则、方法、步骤、特征与作用等几个方面阐述了阅读素质教育的模式,目的在于帮助读者提高阅读素质,进而提高其情报调研的能力,为今后从事科学研究与创新打下坚实的基础。