分析了科研课题申报书中在研究目标的选择、研究主题的表达、研究方法和技术路线
的设计、主要技术指标的确立、预期效果即研究价值的表述等方面存在的问题,介绍了作者
在长期从事医学文献检索查新和教学中得出的经验,为研究人员申报科研课题提供参考
价值。
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介绍了图书馆系统软件资源的主要保护方法,分析了系统加密、硬件保护、软
件保护和备份还原保护等方法的技术特点和存在的问题,指出软件保护法和备份还原保护法
的综合应用是保护图书馆系统的最简单实用方法。
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采用依据主题词表的聚类数据挖掘技术对基于可扩展标识语言(Extensible Markup
Language,XML)的PubMed生物医学工程方面的文献进行分析,实现PubMed生物医学工程文
献的概念导航,建立生物医学工程专题文献数据库,并利用加权的词频统计方法分析其文献
主题分布。
相似文献提高图书流通借阅工作的质量,不仅要有先进的馆舍条件,而且要有优良的流通借阅环境。构建良好的流通借阅环境,需要从文化环境、人际环境和服务质量三个方面进行。
相似文献Agriculture is both the site of development of important new technologies and a key area of application of technologies developed elsewhere. It is little wonder, then, that many thinkers believe that progress in the science and engineering of robotics may soon change the face of farming. This paper surveys the prospects for agricultural robotics, discusses its likely impacts, and examines the ethical and policy questions it may raise. Along with the environmental and economic impacts of robots, political, social, cultural, and security implications of the introduction of robots that have received little attention in the larger literature on agricultural robotics are considered. Key policy choices necessary to meet the ethical challenges likely to arise as agricultural robots start to become used more widely, and to maximise the social, environmental, and economic benefits of robotics in agriculture, are highlighted.
相似文献Agricultural sprayers are utilized in applying pesticides to control pests and diseases in crops. The increase in machine size and a better control system have been associated with increased productivity, improved efficiency and minimized the impact of the chemical on the environment. However, wider booms may contribute to application error due to the difference in speed between the inner and outer boom section when applying in curvilinear passes. Field tests were conducted in three irregular shaped fields with varying terrain using a 36.6-m self-propelled sprayer with a turn compensation technology. The results showed that turning occurred near the grassed waterways, boundaries and end of headlands. The product was applied during turning to 19.0% of Field 1, 17.8% of Field 2 and 22.5% of Field 3. These could have been the percentage of field areas that may receive more or less product if the sprayer was not equipped with turn compensation technology. As expected, the speed difference between the inner and outer boom increases as the radius of turn decreases. The speed difference could translate to an under-application on the outer boom section where the speed is much faster and over-application on the inner boom section where the speed is slower. The application errors from such speed differential could vary from ??48.2 to +?1058.0%, depending on the turning radius. However, the pulse width modulation system implemented duty cycles based on turning speeds, which resulted to a 90.0% application rate uniformity across the field regardless of the travel path during operation.
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