发表时滞与论文影响力关系研究——以图书情报学中文核心期刊为例     

韩牧哲  李秀霞  王冬  刘超 《中国科技期刊研究》2016,27(7):785-792

【目的】探析发表时滞与论文影响力的关系,寻找使论文影响力最大化的理想时滞区间,构建了发表时滞与论文影响力关系数学模型。【方法】采集2013年图书情报学中文核心期刊论文的发表时滞和被引频次数据,利用双参数威布尔分布的概率密度函数,分别对采集到的3785篇论文的发表时滞的概率分布、发表时滞与论文影响力的关系曲线进行拟合。【结果】2013年能使论文影响力最大化的理想发表时滞区间为31至210天,当年论文发表时滞的实际分布区间与理想状态尚存差距。【结论】进一步分析认为论文的影响力与其发表时滞的长短存在相关关系,存在能使论文影响力最大化的理想时滞区间,但发表时滞并非越短越好,预测国内期刊论文发表时滞有进一步缩短的趋势。  相似文献   

全球变化对我国脆弱生态区经济开发的影响   总被引：5，自引：3，他引：5  

冉圣宏  唐国平  薛纪渝 《资源科学》2001,23(3):24-28

脆弱生态区是指对环境因素的改变反映敏感、而维持自身稳定的可塑性较小的生态环境系统,内部结构的不稳定性和对外界干扰的敏感性是它的两个最主要的特征。全球变化和经济开发活动是对脆弱生态区产生影响的最重要的两种外界干扰活动。全球环境变化会严重影响脆弱生态系统的结构,并进而影响到其经济开发活动。目前我国生态环境急剧恶化,全国脆弱生态区的面积占国土总面积的1/5,且其中的北方地区为全球变暖的高敏感区,因此讨论全球变化对我国脆弱生态经济开发的影响具有重要的现实意义。该文在前人工作的基础上,结合我国生态环境的现状、特点及全球变化对我国脆弱生态区的影响,利用国际应用系统分析研究所发展并改进的农业生态地带模型（AEZ).评估了全球变化对我国土地生产潜力的影响,分析了全球变化对我国脆弱生态区经济开发活动的可能影响,并对其适应性特别是全球变化背景下我国脆弱生态区的经济开发对策进行了探讨。  相似文献   

国际期刊撤销论文引证特征及其自身净化效果分析     

付中静 《中国科技期刊研究》2016,27(4):346-351

【目的】分析Web of Science（WoS）数据库近十年撤销论文的引证特征,探究撤销行为对学术界的净化效果。【方法】分析撤销论文数量、被引频次等信息和期刊影响因子（impact factor,IF）的相关性,撤销时滞与论文被引频次的相关性;计算高被引撤销论文对IF的贡献率;评价撤销时滞对撤销前、后被引频次的影响。【结果】 76种期刊（撤销论文数量≥5篇）IF和撤销论文数量、总被引频次、撤销后被引频次、篇均被引频次相关(均为P<0.05)。撤销时滞和撤销论文总被引频次相关（P=0.000）。随撤销时滞延长,撤销前被引频次逐渐增大。高被引撤销论文对期刊IF的贡献率为0.00%～2.00%。【结论】高IF期刊发表的、撤销时滞长的撤销论文对学术界的负影响较大;肯定期刊进行自我净化效果的同时,建议科研管理部门、期刊编辑和科研人员等加强对撤销论文及其不良影响的关注。  相似文献   

浅谈老庄消极思想中的积极因素     

高婷婷 《辽宁教育行政学院学报》2011,(5)

道家思想自从杨朱立派就在世人心中奠定了消极的思想基调。作为一种哲学思想,道家思想经历了不同阶段的发展,其中最重要也是最熟知的就是老子和庄子这两个阶段。从本质上讲,老庄思想的产生背景决定了其难免带有消极的因素,应用起来也与社会现实有偏差,但这不妨碍我们正确认识和积极应用老庄思想中的积极因素。  相似文献   

Can Google Scholar and Mendeley help to assess the scholarly impacts of dissertations?     

Kayvan Kousha  Mike Thelwall 《Journal of Informetrics》2019,13(2):467-484

Dissertations can be the single most important scholarly outputs of junior researchers. Whilst sets of journal articles are often evaluated with the help of citation counts from the Web of Science or Scopus, these do not index dissertations and so their impact is hard to assess. In response, this article introduces a new multistage method to extract Google Scholar citation counts for large collections of dissertations from repositories indexed by Google. The method was used to extract Google Scholar citation counts for 77,884 American doctoral dissertations from 2013 to 2017 via ProQuest, with a precision of over 95%. Some ProQuest dissertations that were dual indexed with other repositories could not be retrieved with ProQuest-specific searches but could be found with Google Scholar searches of the other repositories. The Google Scholar citation counts were then compared with Mendeley reader counts, a known source of scholarly-like impact data. A fifth of the dissertations had at least one citation recorded in Google Scholar and slightly fewer had at least one Mendeley reader. Based on numerical comparisons, the Mendeley reader counts seem to be more useful for impact assessment purposes for dissertations that are less than two years old, whilst Google Scholar citations are more useful for older dissertations, especially in social sciences, arts and humanities. Google Scholar citation counts may reflect a more scholarly type of impact than that of Mendeley reader counts because dissertations attract a substantial minority of their citations from other dissertations. In summary, the new method now makes it possible for research funders, institutions and others to systematically evaluate the impact of dissertations, although additional Google Scholar queries for other online repositories are needed to ensure comprehensive coverage.  相似文献   

Evaluating research and researchers by the journal impact factor: Is it better than coin flipping?     

Ricardo Brito  Alonso Rodríguez-Navarro 《Journal of Informetrics》2019,13(1):314-324

The journal impact factor (JIF) is the average of the number of citations of the papers published in a journal, calculated according to a specific formula; it is extensively used for the evaluation of research and researchers. The method assumes that all papers in a journal have the same scientific merit, which is measured by the JIF of the publishing journal. This implies that the number of citations measures scientific merits but the JIF does not evaluate each individual paper by its own number of citations. Therefore, in the comparative evaluation of two papers, the use of the JIF implies a risk of failure, which occurs when a paper in the journal with the lower JIF is compared to another with fewer citations in the journal with the higher JIF. To quantify this risk of failure, this study calculates the failure probabilities, taking advantage of the lognormal distribution of citations. In two journals whose JIFs are ten-fold different, the failure probability is low. However, in most cases when two papers are compared, the JIFs of the journals are not so different. Then, the failure probability can be close to 0.5, which is equivalent to evaluating by coin flipping.  相似文献   

试论职业联赛表演业产业链的构成要素特点     

王嵩  张超慧  丁建仁 《四川体育科学》2011,(2):33-36

随着我国提出从＂体育大国＂迈向＂体育强国＂的发展方针,联赛表演业的发展已成为引领我国迈向＂体育强国＂的关键之一。本文从联赛表演业的产业链视角出发,在找准其产业链构成要素的基础上,重点对产业链构成要素的特点进行分析,以求为联赛表演业产业链的良好运转提供理论依据。  相似文献   

舞蹈啦啦队运动竞技能力主导因素分析     

安磊 《哈尔滨体育学院学报》2011,29(5):90-93

从舞蹈啦啦队运动的项目特征出发,运用文献资料、问卷调查及专家访谈等研究方法,对影响舞蹈啦啦队运动竞技能力的主导因素进行系统的研究,研究结果表明：影响舞蹈啦啦队运动竞技能力主要有体能因素、技术因素、艺术表现力因素、音乐因素。旨在提高对舞蹈啦啦队运动专项本质特征和训练规律的认识,从而促进我国舞蹈啦啦队运动整体水平的提高。  相似文献   

浅析网络成瘾对中职生的危害及影响因素     

华莉 《临沧师范高等专科学校学报》2011,(1)

据资料显示,中国网络成瘾的人群以13岁到17岁的青少年最多,中职生大多属于这个年龄阶段,分析网络成瘾的影响因素,帮助中职生在青春期塑造健康的人格,树立正确的价值观和人生观,培养对社会有用的技能型人才。  相似文献   

大学图书馆成效评估及其指标体系构建探索     

向远媛  温国强 《大学图书馆学报》2011,29(3):11-16,21

大学图书馆成效评估是对用户在接触图书馆所提供的资源、服务和活动之后所发生的改变进行评估。绩效评估关注图书馆投入与产出的效率,成效评估关注图书馆服务的影响与效果。大学图书馆成效评估的内容主要包括对学习、研究、教学的影响评估。该文结合国外大学图书馆成效评估的实践案例,对大学图书馆成效评估的定义、内容、意义以及评估指标体系等进行探索。成效评估是基于用户为中心的新的评估理论和方法,有利于争取社会各界对图书馆的支持和提高图书馆服务质量。  相似文献