三维表面微观形貌的等高图绘制及粗糙度3-D评定参数计算方法研究

针对零件表面质量的要求愈来愈高，而机加工表面微观形貌的粗糙度3-D评定方法却相对滞后。针对这一问题，本文就三维表面微观形貌的等高图的绘制方法、粗糙度3-D评定参数的计算提出了一些具体编程实现方法。重点阐述了三维表面等高图的绘制方法、3-D支承率和液体滞留性能指数的计算方法。利用JB-4C测量仪，开发了粗糙度3-D评定参数计算系统，验证了该方法的可行性。     

一种新式背负型支撑装置的结构设计

随着武器装备的小型化,便携式装备应用越来越广,进而对便携式装备的体积、重量等指标方面的要求也越来越高。在单兵背负便携设备进行作战架设时,结构巧妙的支撑装置会给整个系统的背负、架设、撤收带来较好的实战效果。文章从支撑装置的选材、结构形式、功能等方面加以阐述,体现了该结构设计的新颖与实用性。     

Researching Internet Communities: Proposed Ethical Guidelines for the Reporting of Results

Communication researchers and social scientists are quickly discovering the value of data that exists in the postings of members of Internet e-mail, Usenet, and real-time groups. The ability to communicate with one's peers, no matter how esoteric the interests, is causing an explosion in the number of new virtual communities. The interpersonal dynamics of these groups are increasingly coming under the scrutiny of academic research. The publicly available archived records of Internet virtual communities are being analyzed for a wide variety of research interests. The ability to do naturalistic observations of group dynamics, as they are exhibited in these exchanges of text, has captured the attention of many researchers. The institutional review boards of major universities are granting researchers exempt or expedited (exempt from full review) status for this work, due to the public nature of the notes being analyzed. These studies often involve the lack of informed consent, where the group members under study are unaware they are being monitored. There is a potential for psychological harm to the members of these groups, depending on the way results are reported. This article explores the ethical considerations that must be taken into account to protect cyberspace participants. The guidelines proposed are based on the American Psychological Association ethical guidelines for use of human subjects in research. An explanation is offered as to how such guidelines can best be applied to the study of Internet communities. The constructs of Group Accessibility (the public/private nature of the actual cyberspace occupied by a group) and Perceived Privacy (the level of privacy that group members assume they have) are defined and proposed as two dimensions by which individual Internet communities may be evaluated in order to assure the ethical reporting of research findings.     

开放教育往届生学习支持服务的实践和探索

优质的学习支持服务是解决开放教育学生工学矛盾,帮助学生顺利完成学业的关键。本研究试图通过对广州电大开放教育往届生数据的整理分析,查找开放教育往届生的基本特点及其学习困难因素,从而为提高开放教育往届生学习支持服务的针对性和有效性,帮助往届生克服学习困难,促进自主学习提供相关支持。     

浅论高校图书馆对研究性学习的支持

高校研究性学习的开展与实施离不开高校图书馆各方面的支持与服务。本文从我国的《教育改革与发展规划纲要》出发,阐明了在当今的知识经济时代研究性学习开展的必要性与紧迫性;通过对研究性学习涵义与特征的分析,提出了高校图书馆研究性学习的支持措施。     

《决策内参》二十春秋省思

在21世纪的今天,作为广东省立中山图书馆文献信息开发品牌的《决策内参》,已经走过了20个春秋,它能否与日新月异的时代同步,保持一种领潮争先的可持续发展状态,成为我们必须认真探讨和研究梳理的现实课题。     

基于运营支撑系统的广电统筹综合运营

数字电视整体转换给广电运营商带来前所未有的历史机遇,＂三网融合＂政策为广电综合业务的开展拓展了更宽阔的途径。通过技术和政策的推动,广电运营商彻底改变了以往业务单一、经营粗放的困境。运营支撑系统由于其自身的灵活性和可扩展性,作为广电整体转换后,所有业务统一接入和管理的综合平台,在广电实际运营过程中扮演着越来越重要的角色。本文通过介绍现代广电运营支撑系统的基础＂eTOM模型＂和一个实际建设的案例,说明在实际运营中,系统所起到的重要作用。     

武汉成品油穿江管道中变频调速系统应用的探讨

本文介绍了武汉成品油穿江管道输送的特点,分析了该段管道在作业时系统流量和扬程的变化情况,对变频调速系统在该段管道中的应用进行了探讨,并对其节能效果及提高输油泵使用寿命方面进行了分析,为武汉成品油穿江管道运行的优化提供了一定的参考。