共查询到20条相似文献,搜索用时 15 毫秒
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陆玲娣 《中国科学院研究生院学报》2000,38(3):276-281
在修订和编写《中国植物志)英文版过程中,依据标本材料(主要是模式标本)和文献考证,对蔷薇科一些属的种进行了修正,并发表了新组合和两个新变种。 相似文献
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网站影响力的定量评价指标——网络影响因子述评 总被引:8,自引:0,他引:8
本文将对网络影响因子(WIFs)这种基于链接的分析方法的产生,发展及其应用进行讨论。从网络计量学诞生到现在,这种分析方法不仅仅有了很重要的发展,而且与之有关的网络数据搜索技术也不断提高。目前WIFs也已经被认为与传统的文献计量学研究存在很强的相关性。从本文分析中可以发现文献计量学通过对超链接的分析已经被应用到网络信息的研究。此外本文对未来的此项研究提供一些建议和经验总结。 相似文献
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R. Shukia S. B. Sharma D. Puri K. M. Prabhu P. S. Murthy 《Indian journal of clinical biochemistry : IJCB》2000,15(1):169-177
Many plants have been used for the treatment of diabetes mellitus in Indian system of medicine and in other ancient systems of the world. Out of these only a few have been evaluated as per modern system of medicine. From many such plants only extracts have been prepared and their usefulness evaluated in experimental diabetes in animals. In some plants likeAllium cepa, Allium sativum, Ficus bengalensis, Gymnema sylvestre, Pterocarpus marsupium etc. active hypoglycemic principles have been isolated and their mechanism of action studied. Most of them seem to act directly on pancreas (pancreatic effect) and stimulate insulin level in blood. Some have extra pancreatic effect also by acting directly on tissues like liver, muscle etc. and alter favourably the activities of the regulatory enzymes of glycolysis, gluconeogenesis and other pathways. Since the plant products have less side effects, they have the potential as good hypoglycemic drugs. They may also provide clues for the development of new and better oral drugs for diabetes. 相似文献
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随着全日制专业学位研究生规模的快速扩张,工程硕士专业学位研究生培养中存在的一些问题日益突出。文章针对当前经济欠发达地区工程硕士专业学位研究生培养过程中存在的主要问题进行分析,探讨了相关对策。 相似文献
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1957年,前苏联发射了世界上第一颗人造地球卫星,标志着人类进入空间时代。空间时代的到来使人类有能力突破大气层的干扰与屏障,以全新的角度探索和研究宇宙空间。近60年来,通过空间科学探测与研究,人类关于宇宙的教科书不断被改写,重大科学发现与突破不断涌现,彻底改变了人类对宇宙和自然的认识;同时,通过空间科学卫星计划,带动了航天技术和相关技术的革命性进展,开辟了多项新的技术与产业领域,激励和鼓舞了数代年轻人追寻科技梦想。空间科学被公认为是"财富的发电机"、"创新的驱动器"和"新理论新知识的源泉",是各科技强国竞相发展、寻求革命性突破的领域,对国家发展具有重要的战略作用。 相似文献
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选择5类要素、25个指标构建了油田勘探开发研究院竞争力指标体系。利用专家调查法和多元线性综合判别函数方法对中国石化各油田研究院的综合竞争力进行评价。根据评价结果将五个油田研究院划分为三类研究院,并运用一个九区矩阵对三类研究院进行核心竞争力定位。最后指出了各油田研究院提升核心竞争力的努力方向和目标。 相似文献
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目的:针对目前国内护理高职专业英语教学中存在的问题,在实践中改革教学方法,激发学生学习专业英语的兴趣,从而取得良好效果。方法:分析护理高职学生学习专业英语的现状,在教学中采用“任务驱动型”方法,组织学生以学习小组形式进行课后练习。结果:学生在有限课时内学到实用的专业英语知识,同时学习专业英语的信心和兴趣都有所提升。 相似文献
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国有企业改革与法人治理结构建设 总被引:2,自引:0,他引:2
本文首先就完善法人治理结构是我国国有企业建立现代企业制度的核心环节进行了分析,然后对法人治理结构的内涵进行了详细的阐述,对国有企业改制、建立法人治理结构的过程中出现的问题进行了深层次探讨,对目前国际上普遍认同的、并值得我国企业借鉴的“OECD《公司治理结构原则》”作了介绍,对国有企业改制过程中如何完善法人治理结构提出了若干对策建议。 相似文献
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Assuring the quality control of publications in the scientific literature is one of the main challenges of the peer review process. Consequently, there has been an increasing demand for computing solutions that will help to maintain the quality of this process. Recently, the use of Artificial Intelligence techniques has been highlighted, applied in the detection of plagiarism, bias, among other functions. The assessment of the reviewer’s review has also been considered as important in the process, but, little is known about it, for instance, which techniques have been applied in this assessment or which criteria have been assessed. Therefore, this systematic literature review aims to find evidence regarding the computational approaches that have been used to evaluate reviewers' reports. In order to achieve this, five online databases were selected, from which 72 articles were identified that met the inclusion criteria of this review, all of which have been published since 2000. The result returned 10 relevant studies meeting the evaluation requirements of scientific article reviews. The review revealed that mechanisms to rank review reports according to a score, as well as the word analysis, are the most common tools, and that there is no consensus on quality criteria. The systematic literature review has shown that reviewers’ report assessment is a valid tool for maintaining quality throughout the process. However, it still needs to be further developed if it is to be used as a resource which surpass a single conference or journal, making the peer review process more rigorous and less based on random choice. 相似文献
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The lifetime of polyester resin samples has been determined with the ASTM D2303 inclined plane tracking test method (IPTTM) for different environmental effects. Most of the external factors have a unique degradation effect, hence the tracking image observed on polyester resin highly depends on these factors. The structure and topography of the tracking patterns generated on the surface of polyester resin have been examined using the fractal dimension model. The accuracy and success of the fractal dimension model can significantly improve the possibility of determining the variety of aging processes that an insulator has been subjected to over a long time period. In order to verify the results, the structures have also been analyzed by using Markov random fields (MRF) and cellular neural networks (CNN). 相似文献
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科技中介在国家创新系统中的功能及其体系构建 总被引:35,自引:0,他引:35
完善科技中介体系对于国家创新系统结构的优化和效能的提高具有十分重要的意义。本文对科技中介组织从广义和狭义两个方面进行了界定,并进行了分类。分析了我国科技中介体系存在的问题,从转变政府科技管理职能、完善法律政策环境、为科技中介组织创造发展空间和营造公平竞争的社会环境等方面提出了对策建议。 相似文献
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工业革命以来,科学技术的成就和经济的发展使人类的物质生活水平有了很大提高,但同时也出现了环境污染、资源短缺两大问题,威胁着人类的生存甚至地球的命运。本文综述了人类面临资源环境问题所进行的思考和可持续发展战略的诞生,可持续发展战略的定义和实施途径以及我国在改变发展模式方面取得的成绩和目前面临的严峻挑战,在此基础上提出了呼吁和建议。 相似文献
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在对区域科技创新能力本质、内涵理解的基础上,建立了陕西省科技创新能力评价指标体系;运用因子分析模型,构建出区域科技创新能力评价模型;运用模型对陕西省三大区域的10个地级市的科技创新能力做了定量评价,提出了相应的政策建议。 相似文献
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本文总结了浙江医科大学等单位近8年来用艾姆斯(Ames)试验检测各类化学品和混合物58种,发现其中12种为诱变剂或含诱变成分物质(胺菊酯、三氯杀虫酯、2,5-二氯硝基苯、非氨化焦糖、氨化焦糖、茶色素、电烤鸡和鸭、炭烤鸭、熏鱼和叉烧硷提物,高效液体冰箱除臭剂);监测古运河杭州段水源,发现其中有诱变剂污染,并进行诱变与SOS反应相关的研究.同时介绍了测试中遇到的一些问题(如含组氨酸、易挥发、难溶性样品,菌株变异,标准诱变剂选择等等),并提出相应对策. 相似文献
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本文指出高校图书馆的服务重心应由“为人找书”转移成“为书找人”,并阐述了实现这种服务模式重心转移的重要性和必要性,同时也分析了实现“为书找人”这一服务模式的条件和应采取的措施。 相似文献