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主要基于Web of Science科技论文和Derwent专利文献,利用SATI、SPSS等分析工具,提取文本关键词并构建相异共现矩阵,采用多维聚类方法识别研究热点主题。在继承和发展Naoki Shibata技术机会理论的基础上,通过对比科技论文和专利文献研究热点主题的差异来识别金属3D打印的技术机会。研究得出,科技论文和专利文献分别有4个研究热点主题,识别了两大类共4个技术机会。首次基于专利和科技论文研究金属3D打印的技术机会,开拓了金属3D打印的研究视野,对金属3D打印行业的企业战略决策具有指导作用。 相似文献
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3D打印已经成为国际国内一个新的技术潮流,世界工业强国纷纷将其作为新的产业发展增长点进行培育。从CNKI中国期刊全文数据库中筛选7 288篇3D打印研究文献,利用SATI工具软件构建高频作者与高频关键词共现矩阵,并利用Ucinet和SPSS软件进行可视化分析,得出我国3D打印技术的发展趋势与4个主要研究主题,进而分析我国3D打印技术的多学科研究特征。 相似文献
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针对1995-2016年间SCI核心数据库中有关“3D打印”主题的2769条文献记录,借助CitespaceIII科学知识图谱软件,选用“聚类”、“标志性文献”、“突发文献”和“突现关键词”四大指标,综合性探索3D打印的研究热点及其演化过程,并展望未来的3D打印研究热点。研究发现：(1)3D打印的研究热点最早出现在1993年,从2005年开始迅猛增长,在2013年出现高峰；(2)热点主要集中在“医疗支架、器官与药品”、“快速成型”、“增材制造”和“化学合成反应”等领域,也出现在“超声波固化”、“激光烧结”和“金属基复合材料”等技术层面；(3)“医疗领域”的相关研究出现最早,并且至今保持异常活跃；(4)“增材制造”、“3D生物打印”、“钛合金”与“化学合成反应”等是近年来最新兴的研究热点；(5)“商业化运营”和“与大数据等新兴技术的融合”等有可能成为未来的研究热点。研究成果可以促进3D打印相关理论的发展,为科研人员确定3D打印领域的研究重点和方向提供参考,为企业掌握市场竞争主动权和政府规划3D打印产业发展提供借鉴。 相似文献
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为了解当前国际钛合金3D打印颠覆性创新研究的现状及趋势,以Web of Science中钛合金3D打印颠覆性创新的350篇文献为数据池,借助于CiteSpace软件进行文献科学计量分析。对三维分布、国家合作网络、机构分布、主要期刊、关键人物进行分析,以了解钛合金3D打印颠覆性创新研究领域的基本情况;对关键词、突显词共现分析进行研究,以了解钛合金3D打印颠覆性创新研究领域的热点;对高被引文献进行分析,以了解钛合金3D打印颠覆性创新研究领域的重要基础知识。研究表明:近几年来钛合金3D打印颠覆性创新研究处于快速发展阶段;核心机构是北京航空航天大学、西北工业大学等;核心期刊是MAT SCI ENG A-STRUCT、ACTA MATER等;核心作者是Murr、THIJSL等;热点主题是微观结构、增材制造等;一些作者的高被引文献构成学术研究的重要基础。分析结果有助于学者把握该研究领域的现状和发展趋势,还可为钛合金3D打印颠覆性创新的后续研究提供参考。 相似文献
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3D打印技术对我国新型工业化建设和促进传统产业转型升级具有重要作用。为综合全面地揭示3D打印技术的研究热点,研究首先以关键词为切入点将期刊论文与专利文献进行整合,然后对高频关键词进行多维尺度聚类,并引入时间维度对聚类确定的信息技术、精密机械、工艺方法和打印材料4个主题领域的关键词词频进行阶段统计,最后依据领域词频的阶段变化对研究现状及热点进行了分析,分析认为：3D打印技术研究热点主要集中在信息技术领域,其他主题领域的研究也均处于持续上升阶段,呈现出多元化的发展趋势。 相似文献
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本文对中国3D打印学术论文进行分析,总结研究特征与规律,将为后续研究指明方向。对于筛选出的1 145篇论文,本文主要运用文献计量学方法进行了研究,统计指标主要是百分比、频次等。现有文献中,关于3D打印工艺SLS、FDM、医学应用、产品开发应用方面的研究成果丰富,对3D打印的探索性研究、应用研究居多,解释性研究、基础研究偏少。国家自然科学基金对3D打印研究的支持时间最早、力度最大。高校、研究所是3D打印研究的主力军,企业的研究相对薄弱。下载频次靠前的文献的研究视角是产业经济学,被引频次、文献被引-下载比排名居前的均为华中科技大学的研究成果。 相似文献
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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
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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
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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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《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
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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
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《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
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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
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Milton Mueller 《The Information Society》2001,17(3):151-163
Long-standing conflict between domain name registrants and trademark holders prompted the Internet Corporation for Assigned Names and Numbers (ICANN) to create a global, mandatory arbitration procedure known as the Uniform Dispute Resolution Policy (UDRP). The UDRP has been used in 2166 cases involving 3938 domain names as of 1 November 2000. The policy gives the initiator of a complaint, generally a trademark holder, the right to choose which ICANN-accredited dispute resolution service provider (RSP) will handle the case. During the preparation of the UDRP,some feared that complainant selection would lead to "forum shopping" that might bias the results. This article performs a statistical assessment of the forum-shopping thesis and finds support for it. There are statistically significant differences in the various RSPs' propensity to take away names from defendants; there are also major differences in the number of cases brought to each RSP. RSPs who take away names have the larger share of cases. The study examines other variables that might explain differences in market share, such as price, the plaintiff's nationality, or the time taken to decide a case. It finds that nationality and time also are correlated with market share. The study concludes that shopping for a favorable outcome is an important factor in the UDRP. 相似文献
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Prof. Raymond C.K. Chen a neuropsychologist with the CAS Institute of Psychology has made novel progress in his studies of schizophrenia. His work has been reported by a recent issue of Behavioural Neurology.…… 《中国科学院院刊(英文版)》2008,22(1):15-15
Prof. Raymond C.K. Chen, a neuropsychologist with the CAS Institute of Psychology, has made novel progress in his studies of schizophrenia. His work has been reported by a recent issue of Behavioural Neurology. 相似文献
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《中国科学院院刊(英文版)》2014,(3)
<正>In Xishuangbanna,one of China’s most biodiverse regions,landscape has changed dramatically during the past three decades due to the conversion of tropical rainforest to rubber plantations.In steep areas,terraces are often constructed before planting rubber trees,which causes two important changes in the soil:the destabilization of soil in the bench terraces and the increased vulnerability of unvegetated riser faces to erosion.Few studies have documented the nature and intensity of erosion on bench terraces.Prof.LIU Wenjie and his colleagues from the Xishuangbanna Tropical Botanical Garden(XTBG)conducted a study in Menglun County(21°5′39″N,101°15′55″E),Xishuangbanna to evaluate the influence 相似文献