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一种机械设备用起吊装置的设计
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作者 韩海敏 韩一庆 光孟坷 《机械工程与自动化》 2024年第5期123-124,共2页
针对起吊装置在使用过程中存在的功能单一、能耗大、取放效率低、需要人工查找等问题,设计了一种适用于机械设备的改进型起吊装置。基于轻量化、自动化、安全化的设计要求,确定了起吊装置的机械整体结构,详细介绍了装置中的升降机构、... 针对起吊装置在使用过程中存在的功能单一、能耗大、取放效率低、需要人工查找等问题,设计了一种适用于机械设备的改进型起吊装置。基于轻量化、自动化、安全化的设计要求,确定了起吊装置的机械整体结构,详细介绍了装置中的升降机构、放置机构及工作原理。该装置升降稳定、控制精准,可节省人工成本,并降低了安全隐患,实现了自动化取放,有利于提高起吊作业的工作效率。 展开更多
关键词 起吊装置 机械设备 自动化取放
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Open Access and the Developing World 被引量:4
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作者 Subbiah Arunachalam 《图书情报工作》 CSSCI 北大核心 2006年第1期34-37,40,共5页
Till about 15 years ago, almost all information exchange among scientists and scholars was mediated by print and even then researchers in the developing countries were at a great disadvantage as their libraries did no... Till about 15 years ago, almost all information exchange among scientists and scholars was mediated by print and even then researchers in the developing countries were at a great disadvantage as their libraries did not have the resources to subscribe in comparison with even a small fraction of journals libraries in advanced countries. But the Internet and the World Wide Web initially exacerbated the gap between the rich and the poor countries, as many poor countries were slow to acquire these technologies and the infrastructure (especially bandwidth). Soon it became clear that thanks to these technologies we now have the unprecedented opportunity of having a level playing field in the matter of accessing scientific and scholarly information. Transforming this opportunity into reality is entirely in the hands of the researchers themselves. Imagine a world where every scientist places his/ her research papers, which (s)he wants to give away so others can read and make use of, in a public archive. Anyone anywhere in the world, of course having an Internet connection, can access, download, and read those papers. This is a win-win situation for all: the reader gets to read what he wants to read at very little cost; the author gains greater visibility for his work and the work reported is likely to have greater impact than if it were to be made available only through a toll-access journal. Although the logic is so simple, in reality such archives were not coming up for a very long time. In spite of the fact that computer scientists and physicists had shown about 15 years ago the great advantages of such archives. Recent studies by Alma Swan and others have shown that a very large proportion of scientists are not aware of open access and therefore what we need is focused advocacy. Even among those who know of OA, many are not depositing their papers in archives but say they would if they are asked by their bosses or their funding agencies. Clearly the ball is in the court of scientists and policy makers. OA is especially advantageous to the developing countries as the current access to literatures is poorest in these countries. 展开更多
关键词 open access india developing country
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