特征因子与其他文献计量指标关系研究——基于面板数据的估计

为了研究期刊特征因子与其他文献计量指标间的关系,克服简单相关系数和普通回归分析的缺陷,本文基于汤森路透JCR纯数学期刊数据,采用面板数据(Panel Data)研究特征因子分值(Eigenfactor Score)及论文影响分值(Article Influence Score)与其他文献计量指标的关系。研究发现:特征因子分值和论文影响分值互为高度相关。即年指标及影响因子与特征因子分值无关,但和论文影响分值正相关。被引半衰期及5年影响因子与特征因子分值负相关,与论文影响分值正相关。总被引频次及期刊论文数量与特征因子分值正相关,与论文影响分值负相关。研究认为,特征因子的推出有利于期刊重视提高学术质量而不是提高文献计量指标值,对文献计量指标的相关关系的研究方法要重新审视,对于其他学科特征因子与文献计量指标的关系有待进一步研究。     

The relationship between eigenfactor and other bibfiometric indicators based on panel data

为了研究期刊特征因子与其他文献计量指标间的关系,克服简单相关系数和普通回归分析的缺陷,本文基于汤森路透JCR纯数学期刊数据,采用面板数据（Panel Data）研究特征因子分值（Eigenfactor Score）及论文影响分值（Article InfluenceScore）与其他文献计量指标的关系。研究发现：特征因子分值和论文影响分值互为高度相关。即年指标及影响因子与特征因子分值无关,但和论文影响分值正相关。被引半衰期及5年影响因子与特征因子分值负相关,与论文影响分值正相关。总被引频次及期刊论文数量与特征因子分值正相关,与论文影响分值负相关。研究认为,特征因子的推出有利于期刊重视提高学术质量而不是提高文献计量指标值,对文献计量指标的相关关系的研究方法要重新审视,对于其他学科特征因子与文献计量指标的关系有待进一步研究。     

高校学报载文特征对文献指标影响的量化研究——以《中国矿业大学学报》为例

【目的】 提出用数学方法定量分析高校学报载文特征信息对其文献指标的影响,为优选稿件提供依据。 【方法】 以2005—2014年《中国矿业大学学报》载文特征信息和中信所、中国知网公布的期刊主要文献指标为样本,通过建立互信息（MI）对高校学报载文特征信息与高校学报文献指标的相关性进行定量分析;利用偏最小二乘（PLS）方法构建高校学报载文特征因子与文献指标的数学模型,然后引入MIV的计算策略,获得各载文因子对某文献指标MIV的累积贡献率(ACR)。 【结果】 高校学报载文学科因子的互信息MI值高于作者因子的互信息MI值,揭示优选学科方向是提升高校学报文献指标的关键;PLS模型能够准确地表达载文特征因子与文献指标之间的数学关系,与MIV策略相结合可有效评估载文特征因子对文献指标的影响。 【结论】 用基于互信息的直接分析方法和基于平均影响值模型评估的间接分析方法,有助于优选稿件以提升高校学报学术影响力。     

单篇学术论文对影响因子的贡献率研究——基于Nature的定量分析

【目的】分析单篇学术论文对影响因子的贡献率,为相关研究者提供一个新的视角理解影响因子。【方法】 以Nature作为数据样本,采用文献计量法建立单篇论文的影响因子贡献率和绝对标准距离的测度指标,并利用回归分析研究其分布特征。【结果】结果表明,25%左右的论文对Nature影响因子的贡献程度达到了60%以上,单篇论文与影响因子的绝对标准距离符合指数分布,且多数论文位于基准线以下。【结论】学术期刊中的大多数论文与影响因子绝对标准距离较远,并对期刊影响因子做出负贡献。     

掠夺性期刊特征标准述评

【目的】对国际掠夺性期刊特征标准进行总结研究,找出其内容规律和研究方向,并为我国预警期刊名单制定提供有益参考。【方法】通过数据库文献调研和网络调研,利用Excel、引文网络等工具选取期刊黑名单列表、研究文献、期刊评价工具和高校图书馆四大方面的标准进行系统研究。【结果】国际掠夺性期刊特征标准内容集中在期刊与编委会信息、同行评议、商业实践、存档访问与版权、索引和指标、文章、网站、文章处理费和出版实践等方面,研究开始注重对标准有效性的评估和标准编制。【结论】国际掠夺性期刊研究可以为我国预警期刊特征标准研究的内容、方法方向和研究主体提供有益参考。     

CiteScore、CiteScore百分位与常用期刊评价指标的相关性分析

【目的】 分析CiteScore、CiteScore百分位与常用期刊评价指标的相关性,评价其文献计量学特征,为指标的进一步应用提供参考。【方法】 以2016年数据为基础,在Scopus和Web of Science数据库共同拥有的学科中,考虑学科规模以及影响力的差异,选择4个学科的期刊为研究对象,分别在学科内分析CiteScore、CiteScore百分位与期刊常用文献计量学指标(SNIP、SJR、影响因子、特征因子、论文影响分值、影响因子百分位、标准特征因子、即年指标等)的相关性,在学科间分析CiteScore百分位与SNIP、影响因子百分位、标准特征因子的相关性。【结果】 在学科内,CiteScore、CiteScore百分位与上述指标均呈现显著正相关(P均小于0.05);在学科间,CiteScore百分位与影响因子百分位、SNIP、标准特征因子均呈现显著正相关(P均小于0.001)。【结论】 CiteScore可以和影响因子等文献计量学指标一样用于学术期刊的评价,CiteScore百分位也适用于期刊的跨学科评价。     

期刊引用行为与影响因子的关系

【目的】 探索期刊的文献引用行为与影响因子之间的关系,帮助编辑提高期刊影响力,帮助作者通过改进引用行为获得较高的被引潜力。【方法】 收集2014—2015年荒漠化与水土保持领域的8种中文核心期刊的文献,分析引文内容,包括期刊文献的平均参考文献数量、引文的情感倾向,以及不同引用功能的引用行为重要性加权差异情况与影响因子的相关性。【结果】 期刊文献的平均参考文献数量与影响因子存在显著相关关系;文献引文中的负向情感占比与影响因子无直接关系;基于不同引用功能的引用行为重要性加权与影响因子存在显著的相关关系。【结论】 参考文献数量较多以及引用方法、相关研究、数据、结论、观点较多的文章被引潜力较高。     

入选百种杰出学术期刊的特征分析与持续影响力对策

【目的】对2012-2014年高校主办科技期刊入选"百种中国杰出学术期刊" 的典型特征进行研究。【方法】 分析入选期刊重要文献指标的变化。【结果】 指出在所属学科中期刊综合评价总分领先和影响因子、学科影响指标、他引率等文献计量指标居前是科技期刊入选百种杰出学术期刊的关键,用影响因子当量值可预测今后入选的期刊。结合《中国矿业大学学报》蝉联百种杰出学术期刊的工作实践,提出编辑在初审来稿创新时应注重的3个层次和关注的3个方面因素。【结论】 把握期刊组稿优先方向,注重在稿源、评审质量、编辑水平和传播速度4个方面提高期刊的竞争力,有助于期刊今后入选百种杰出学术期刊。     

基于文献类型矫正影响因子在信息科学与图书馆学期刊中的实证分析

【目的】基于不同文献类型,对信息科学与图书馆学期刊的5年影响因子（5IF）进行矫正,以期明确基于文献类型矫正影响因子在信息科学与图书馆学期刊中的应用价值。 【方法】 以SSCI信息科学与图书馆学30种期刊为研究对象,在分析文献类型的基础上,提出5种矫正5IF,传统5IF也由计算获得;将各刊的传统5IF、矫正5IF与总被引频次、2年影响因子、特征因子、SJR值、SNIP值做Spearman相关性分析。【结果】 各矫正5IF与传统5IF在期刊评价中有较强的一致性,各矫正5IF之间也有强相关性;传统5IF和各矫正5IF与期刊其他各评价指标间均呈显著正相关,且相关系数差异很小。【结论】基于文献类型矫正影响因子的方法不建议应用于信息科学与图书馆学期刊。     

中文学术论文的外文文献引用特征分析

【目的/意义】对中文学术论文中的外文文献引用特征的充分挖掘和系统分析是了解国内学者的外文文献 资源使用规律,从而促进外文资源合理利用的有效手段,也是完善论文质量评价体系和制订文献保障战略的重要 研究课题之一。【方法/过程】从论文审稿人和指标评价角度,对外文文献利用的主观意愿、期刊质量相关性、研究主 题特征等要素进行了深入分析。【结果/结论】实证研究结果显示,期刊审稿人对外文文献的价值一致持肯定态度, 期刊外文引文率和影响因子之间存在显著的正相关关系。不同的研究主题因国际化程度不同,外文引文率有较大 差异。【创新/局限】通过定量方法发现和解释了中文学术论文中外文参考文献的引用模式。     

Students' Reactions to the Introduction of Videoconferencing for Classroom Instruction

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.     

Cooler temperatures inductive to locust outbreaks

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.     

Exploring Multiplexity: Social Network Structures in a Computer-Supported Distance Learning Class

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.     

Low doses of a red wine ingredient figh diabetes in mice

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.     

The Role of Intermediating Institutions in the Diffusion of Electronic Data Interchange (EDI): How Industry Associations Intervened in Denmark, Finland, and Hong Kong

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.     

How Electronic Publishers are Protecting Against Piracy: Doubts About Technical Systems of Protection

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.     

Rough Justice: A Statistical Assessment of ICANN's Uniform Dispute Resolution Policy

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.     

Prevalence of soft neurological signs in Chinese people

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.     

Molecular motor assembly of a biomimetic system

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.     

Monoculture Rubber Plantations Have Negative Ef ects on Controlling Splash Erosion

<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