排序方式： 共有63条查询结果，搜索用时 15 毫秒
31.
煤矿机械的故障诊断和维修 总被引：2，自引：0，他引：2
张庆永 《安徽科技学院学报》2006,20(5):92-95
煤矿机械设备频繁的故障发生率在很大程度上取决于其自身的特点。本文简要介绍了机械设备维修的四种方式和目前我国煤矿企业采用的故障诊断技术,并探讨了提高煤矿机械设备可维修性的途径。 相似文献
32.
对2000年至2009年间有关数字资源长期保存的期刊论文从论文数量、关键词、期刊分布等几个方面进行了统计归纳,分析其研究内容和主题,并介绍了目前国外数字资源长期保存领域的主要研究项目、保存技术和系统方案的研究进展等。 相似文献
33.
分析了目前《现代教育技术》公共课程教学存在的问题,从课程内容设置、课程教学组织形式、课程评价方式等方面探讨了《现代教育技术》公共课教学优化策略。 相似文献
34.
《污水处理新技术》是环境科学专业的主要选修课之一。本文介绍了该课程的性质、目的及教学内容,提出了目前教学中存在的主要问题,并结合实际授课情况提出了应对的解决措施。 相似文献
35.
This article brings together two areas of research: studies on risk perception of technologies and studies on vocational/career choice. This is an important link since decisions concerning technologies are influenced by decision makers’ risk perceptions and these in turn may be related to educational and career paths.We analyze students of different academic disciplines with regard to their risk perception of four technologies. The aim is to find out whether there is a relationship between area of study (as a precursor of vocational and career choice) and risk perception of technologies regarding health, environment and society. The four technologies under study are renewable energies, genetic engineering, nanotechnology and information and communication technologies (ICT). Key results are: irrespective of academic discipline risk of genetic engineering on average is rated highest and renewable energies lowest. This holds for all the risks studied (environmental, health, societal risks). On average, students from different academic disciplines differ in their risk perception. Factor analyses show that common dimensions of risk are the technologies and not the kind of risk. Regression analyses show that the variables influencing perceived risks vary between the technological fields. 相似文献
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37.
《普罗米修斯》2012,30(1):101-119
This article investigates the take-up by universities of enterprise-wide computer systems and the development of a new module for the management and administration of students. Having its origins in Electronic Commerce, the system assumes the existence of a certain kind of user, one with particular roles and responsibilities--Aa self-service user. The notion of 'self-service' is deployed as an integral part of the system rollout where students are to view, input and modify administrative and financial information on themselves and their courses. Drawing from the sociology of science and technology, and material from a 3-year ethnographic study, we describe the system's implementation in a British university. While accepting of the need for an ERP system the campus community reject self-service. However, as we will show, because Campus Management is a 'global product' unwanted functionality can be difficult to resist outright and this can have important implications for the autonomy of the university and the reshaping of fundamental principles and relationships. 相似文献
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The present study investigated the effects on learning in a sheltered Internet environment using so-called WebQuests in elementary school classrooms in the Netherlands. A WebQuest is an assignment presented together with a series of web pages to help guide children's learning. The learning gains and quality of the work of 229 sixth graders participating in either a free-search Google condition or a closed-search WebQuest condition were compared. The closed-search condition showed the highest learning gains for boys. Children's information processing and linguistic skills generally influenced their learning gains and did not interact with condition. A difference in the quality of writing for the two conditions was also found with the language quality being higher in the free-search condition. 相似文献
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基于外部冲击、风险偏好视角,采用调研获取的农户数据,运用Heckman样本选择模型实证分析农户对低碳农业技术的决策选择与采用程度的影响因素,并引入交互项检验风险偏好对外部冲击的调节效应。研究结果表明:当前农户低碳农业技术采用率较低,风险厌恶程度较高者对各项低碳技术的采用率更低;外部冲击、风险偏好均负向显著影响农户采用低碳农业技术的决策选择及采用程度,风险偏好对外部冲击有增强型调节效应,即风险偏好强化外部冲击对低碳农业技术采用的负效应,通过增加农户对风险和不确定性的敏感程度从而间接负向影响农户对低碳农业技术的采用;个体特征、家庭特征对农户低碳农业技术决策选择和采用程度两阶段的影响同中存异,均受到是否党员或村干部的影响,而在性别、年龄、劳动力人数方面存在差异。 相似文献
40.
Puay Tang 《The Information Society》1998,14(1):19-31
The increasing prospects of digital piracy has prompted the perceived need by electronic publishers to adopt technical systems of protection, and governments to reform their copyright laws. This article is a preliminary study of the management of intellectual property by electronic publishers, defined as those involved in the production of online databases, and CD-ROMs. It focuses on three main issues: (1) how electronic publishers view the increasing threat of piracy; (2) the methods of protection employed to protect intellectual property in digital format; and (3) the importance of technological protection of intellectual property in electronic publications. The analysis is based on a sample of 23 UK electronic publishers. The interviews revealed an interesting assortment of protection methods and did not show that technological protection was a preferred way. Instead, the means of protection, in addition to copyright law, comprised niche markets, pricing, trust, bad publicity, and nontechnical and technical means. 相似文献