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1.
通过整理SCI数据库中中国和印度农业科学方面的国际合著论文,从国际合著论文数量、国际合著论文篇均合著国家数、国际合著论文篇均被引频次、国际合著网及国际合著论文的学科分布,比较了两国农业科学领域的国际合作.结果是,中国农业科学领域的国际合著论文自2000年开始超过印度,且差距越来越大;中国国际合著论文的篇均被引频次高于印度;中国更注重加强已有的国际合著关系,印度更注重建立新的国际合著关系;中国农业科学领域国际合作的重点学科依次是食品科技、农艺学、土壤学,印度依次是农艺学、食品科技、多学科农学. 相似文献
2.
[目的/意义]为优化科研资源配置及完善学科布局提供参考。[方法/过程]以ESI数据库中国产出的高被引论文为样本,用文献计量学和社会网络分析法对论文的产出、国际合作率和集中度、国际合作类型及其影响力差异、国际合作倾向以及合作主导性等方面开展分析。[结果/结论]中国ESI高被引论文的产出仅次于美国,国际合作论文现已成为产出的重要组成部分;中国国际合作广度不断增加,但与不同国家合作产出高质量论文的数量差异较大;国际合作的主要类型为双边合作,但多边合作产出引用增长量最高;虽然中国在各学科主导率差异较大,但在大部分国际合作论文中处于主导地位。 相似文献
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[目的/意义]探索国际合作下世界主要国家/地区高被引论文的产出情况及影响力水平。[方法/过程]以2008-2018年ESI中22个学科领域186 474篇高被引论文为基础研究数据，以高被引论文总数排名前10的国家/地区为主要研究对象，对样本国家/地区高水平、高影响力的科技文献产出、产出影响力及合作情况进行分析，重点分析我国进入ESI学科所属高被引文献的国际合作情况及影响力特征。[结果/结论]国际合作对不同国家/地区的科研产出影响不同；国际合作强度与成果产出影响力不存在显著的正相关关系；国际合作对我国大部分学科领域的高被引论文均有积极的正面影响，但部分学科领域国际合作高被引论文的总体影响力却低于我国自主研发高被引论文。 相似文献
4.
【目的】 分析不同学科学术性论文和综述评论性论文的零被引率。【方法】 选取4个被引半衰期相差较大的学科,从Web of Science中获取各学科2008年发表的学术性论文和综述评论性论文在发表后10年间的被引频次,研究其零被引率的变化情况。【结果】 所选4个学科学术性论文和综述评论性论文在发表当年的零被引率均高于60%,随后逐年下降并趋于平稳,发表10年后零被引率稳定在10%以下;不同类型文献的零被引率差异明显;不同学科的零被引率均有所不同,被引半衰期越长的学科,其学术性论文零被引率越高。【结论】 不同学科学术性论文和综述评论性论文的零被引率变化规律存在差异。 相似文献
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郭永正 《科学学与科学技术管理》2013,34(2):70-79
采用SCI数据库中国的和印度的国际合作论文,从国际合作论文的结构、国际合作的主导——从属率、国际合作的劳动规模、国际合作最多的五个国家和地区,在学科层面上比较了两国的国际科学合作,展示了两国的国际科学合作的异同点.从而也说明ESI的学科分类是国际科学合作研究中比较理想的方法. 相似文献
6.
采用SCI-E数据库中的中国论文数据和印度论文数据,从中离析出中国和印度物理学领域的国际合作论文分别为19148和11048篇,依此为样本分析两国物理学领域国际合作的发展状况。发现两国具有不同的增长模式和不同的合作重点,印度国际合作论文的引文率高于中国。建议学界和相关部门关注我国物理学领域的国际合作状况,为我国物理学的快速发展提供政策支持。 相似文献
7.
【目的】 了解综合性农业科学类中文核心期刊零被引论文特征,探讨该类期刊在提高影响力方面的措施。【方法】 收集《中文核心期刊要目总览》中13种综合性农业科学类期刊在2011年发表的零被引论文,对其作者数量、第一作者所属机构、第一作者职称、第一作者学历、基金资助情况以及论文下载频次、篇幅、类型及学科分布等进行统计分析。【结果】 各刊零被引论文数量与其发文量相关性不大,零被引率与期刊的影响因子呈负相关。高等院校的零被引论文占比最大;零被引论文随完成论文合作机构数量的减少而增加。基金资助论文的零被引率高于非基金资助论文;资助项目少的论文零被引率低于资助项目多的论文。篇幅短的文章或不系统的研究性论文较少被引用。摘要信息量存在一定程度的不完善。综述型论文零被引率小于研究型论文。【结论】 各刊发文量与零被引论文量间的关系视具体情况而定。针对零被引论文占比较大的稿件,即高等院校及任务类稿件,应在论文发表前的各环节进行协同控制。要加强及重视摘要信息的规范编辑。对来稿字数应作要求。编辑要及时掌握研究领域动向,加强与资深专家及学科带头人间的沟通,积极约稿。尽早发表并提高论文的显示度,进而减少零被引或低被引文献的产量。 相似文献
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医院在临床医学研究中发挥着重要作用,与其他基础学科、应用学科的合作也日益密切。分别以篇均被引频次和高被引论文占比为评价指标分析中国医院在2000年至2009年期间参与发表的研究论文。论文的被引用情况与合作单位数量具有一定的线性相关关系,医院与非医院的跨学科合作论文、国际合作发表的研究论文影响力要高于医院与医院合作、国内合作的论文。 相似文献
10.
《中国水稻科学》发表后两年内零被引论文分析 总被引：2，自引：2，他引：0
为了给编辑组稿和作者投稿提供依据,分析了《中国水稻科学》2000～2009年发表两年后零被引用论文的年度间数量变化、第一作者、第一单位、学科分布、栏目、页码、期号等信息.研究结果显示,《中国水稻科学》发表两年后零被引用论文比例最高为1992年的68.6％,最低为2006年的8.1％,大体上呈下降趋势,网络快速发展后,即2004年后保持在10％左右;《中国水稻科学》刊发的主流学科的论文的零被引篇数相应也较多;不同第一完成单位的论文零被引比例波动较大(5.7％～100.0％),中国水稻研究所等以水稻为研究对象的农业科研单位的论文,零被引比例较低;综述类文章的零被引比例较低、研究简报的零被引比例较高;另外,后半年发表论文的零被引篇数较多.发表后两年内零被引论文的在发表多年后的总引用次数和下载次数也较低,大多低于平均水平,仅有极个别论文下载量较大. 相似文献
11.
A research group led by Prof. ZHAI Qiwei from the Institute for Nutritional Sciences under the CAS Shanghai Institutes for Biological Sciences has discovered that even relatively low doses of resveratrol-a chemical found in the skins of red grapes in red wine-can improve the sensitivity of mice to the hormone insulin according to a report in the October issue of Cell Metabolism.…… 《中国科学院院刊(英文版)》2008,22(1):14-15
Aresearch group led by Prof. ZHAI Qiwei from the Institute for Nutritional Sciences under the CAS Shanghai Institutes for Biological Sciences has discovered that even relatively low doses of resveratrol--a chemical found in the skins of red grapes and in red wine--can improve the sensitivity of mice to the hormone insulin, according to a report in the October,2007 issue of Cell Metabolism. As insulin resistance is often characterized as the most critical factor contributing to the development of Type 2 diabetes, the findings“provide a potential new therapeutic approach for preventing or treating” both conditions, the researchers said. 相似文献
12.
《中国科学院院刊(英文版)》2008,22(1):2-3
CAS should stick to the principle of rendering service to, and giving impetus for, the development of China＇s science enterprise by making S＆T innovations, said CAS President LU Yongxiang. The CAS president made the remarks in a recent talk to communicate the gist of the winter session of the Party＇s Leading-member Group at CAS, which was held from 7 to 11 January in Beijing. 相似文献
13.
Marjorie Armstrong-Stassen Margaret Landstrom Ramona Lumpkin 《The Information Society》1998,14(2):153-164
This study examined how students who had no prior experience with videoconferencing would react to the use of videoconferencing as an instructional medium. Students enrolled in seven different courses completed a questionnaire at the beginning of the semester and again at the end of the semester. Students at the origination and remote sites did not differ in their reactions toward videoconferencing but there was a significant difference for gender. Women reacted less favorably to videoconferencing. Compared to the beginning of the semester, students reported significantly less positive attitudes toward taking a course through videoconferencing at the end of the semester. There were no significant differences in students' attitudes toward videoconferencing across courses at the beginning of the semester but there were significant differences across the courses at the end of the semester. The results suggest the need for better preparation for both students and instructors. 相似文献
14.
《中国科学院院刊(英文版)》2008,22(1)
With great care, Dr. ZHOU Zhonghe takes out a package wrapped by cotton tissue from a drawer and says: "This is the gem of our collections: the fossil of a bird that lived 125 million years ago!" Then, pointing at a tiny mound, he explains: "Look, this is the claw and that is the head. It was in the egg shell and ready to hatch ... The species fell into a family of waterside inhabitants." 相似文献
15.
A joint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology his co-workers from Norway US Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells suggesting that China's projected climate warming could decrease the pest's numbers. The study was published in Proceedings of the National Academy of Sciences on September .…… 《中国科学院院刊(英文版)》2008,22(1):6-7
Ajoint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology and his co-workers from Norway, US and Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells, suggesting that China＇s projected climate warming could decrease the pest＇s numbers. The study was published in Proceedings of theNational Academy of Sciences on 17 September, 2007. 相似文献
16.
Active biological molecules functional structures can be fabricated into a bio-mimetic system by using molecular assembly method. Such materials can be used for the drug delivery disease diagnosis therapy new nanodevice construction.…… 《中国科学院院刊(英文版)》2008,22(1):22-22
Active biological molecules and functional structures can be fabricated into a bio-mimetic system by using molecular assembly method. Such materials can be used for the drug delivery, disease diagnosis and therapy, and new nanodevice construction. 相似文献
17.
Caroline Haythornthwaite 《The Information Society》2001,17(3):211-226
A computer-mediated group is a complex entity whose members exchange many types of information via multiple means of communication in pursuit of goals specific to their environment. Over time, they coordinate technical features of media with locally enacted use to achieve a viable working arrangement. To explore this complex interaction, a case study is presented of the social networks of interactions and media use among members of a class of computer-supported distance learners. Results show how group structures associated with project teams dominated who communicated with whom, about what, and via which media over the term, and how media came to occupy their own communication niches: Webboard for diffuse class-wide communication; Internet Relay Chat more to named others but still for general communication across the class; and e-mail primarily for intrateam communication. Face-to-face interaction, occurring only during a short on-campus session, appears to have had a catalytic effect on social and emotional exchanges. Results suggest the need to structure exchanges to balance class-wide sharing of ideas with subgroup interactions that facilitate project completion, and to provide media that support these two modes of interaction. 相似文献
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Electronic data interchange (EDI) provides means for interorganizational communication, creates network externalities, requires an advanced information technology (IT) infrastructure, and relies on standards. In the diffusion of such innovations, institutional involvement is imperative. Such institutions contain governmental agencies, national and global standardization organizations, local government, and nonprofit private organizations like industry associations. The last type of organizations we call intermediating institutions. They intermediate or coordinate ("inscribe") the activities of a group of would-be adopters. Unfortunately, little is known of how these organizations shape the EDI diffusion trajectory. In this article we examine one specific type of intermediating organizations?industry associations?and how they advanced the EDI diffusion process in the grocery sectors of Hong Kong, Denmark and Finland. We identify six institutional measures, placed into a matrix formed by the mode of involvement (influence vs. regulation) and the type of diffusion force (supply push vs. demand pull), that can be mobilized to further the EDI diffusion. Industry associations were found to be active users of all these measures to varying degrees. Their role was critical especially in knowledge building, knowledge deployment, and standard setting. Furthermore, institutional involvement varied due to policy and cultural contingencies and power dependencies. 相似文献
19.
Leah A. Lievrouw 《The Information Society》2000,16(2):155-159
This essay focuses on universal service and the Internet as means to support social and political participation. The emphasis on access to telecommunications systems in conventional approaches to universal service is contrasted with access to content. A model of the information environment is described that accounts for the roles of content and conduit, both of which are necessary conditions to achieve true access. A method is outlined for employing information indicators to observe or measure the information environment. 相似文献
20.
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