全文获取类型
收费全文 | 20268篇 |
免费 | 736篇 |
国内免费 | 493篇 |
专业分类
教育 | 11452篇 |
科学研究 | 4062篇 |
各国文化 | 17篇 |
体育 | 2531篇 |
综合类 | 1330篇 |
文化理论 | 15篇 |
信息传播 | 2090篇 |
出版年
2024年 | 30篇 |
2023年 | 94篇 |
2022年 | 313篇 |
2021年 | 586篇 |
2020年 | 652篇 |
2019年 | 518篇 |
2018年 | 421篇 |
2017年 | 420篇 |
2016年 | 555篇 |
2015年 | 681篇 |
2014年 | 1296篇 |
2013年 | 1766篇 |
2012年 | 1815篇 |
2011年 | 1820篇 |
2010年 | 1230篇 |
2009年 | 1027篇 |
2008年 | 1244篇 |
2007年 | 1398篇 |
2006年 | 1317篇 |
2005年 | 1056篇 |
2004年 | 903篇 |
2003年 | 687篇 |
2002年 | 518篇 |
2001年 | 409篇 |
2000年 | 255篇 |
1999年 | 129篇 |
1998年 | 84篇 |
1997年 | 61篇 |
1996年 | 48篇 |
1995年 | 27篇 |
1994年 | 26篇 |
1993年 | 19篇 |
1992年 | 27篇 |
1991年 | 15篇 |
1990年 | 7篇 |
1989年 | 6篇 |
1988年 | 1篇 |
1981年 | 1篇 |
1979年 | 11篇 |
1978年 | 7篇 |
1977年 | 5篇 |
1976年 | 11篇 |
1957年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
151.
[目的/意义] 探讨Altmetrics指标对学术图书影响力进行评价的有效性,为学术图书评价工作提出合理建议。[方法/过程] 获取Twitter提及量、Mendeley阅读量、在线书评数量以及馆藏量指标数据,对数据集的覆盖率、分位数等统计量分析后,将被引频数与Altmetrics指标进行了指标间相关系数检验,再对高Altmetrics指标值的学术图书进行年份分布、学科差异及图书主题等实证分析,探究各指标在学术图书影响力评价中的应用。[结果/结论] 传统计量指标被引频数与Altmetrics指标之间的相关性较低,说明Altmetrics可以作为学术图书评价的一个新视角,不同Altmetrics指标反映了学术图书影响力的不同维度。未来的学术图书影响力评价建议结合学术图书的年份、学科等特征,将传统的引文与Altmetrics指标相结合,探索更全面有效的评价机制。 相似文献
152.
Heather E. Canary Kris May Marc D. Rinehart Jahn B. Barlow 《Journal of Applied Communication Research》2018,46(2):202-222
Organizational communication scholars are increasingly called upon to use theoretical knowledge to address problematic processes in public institutions. This article reports a process improvement project focused on a university conflict of interest (COI) policy as an example of how scholars can engage theory to improve ongoing policy processes. The project team included communication scholars and research administration staff who designed, implemented, and evaluated the mixed-methods project guided by structurating activity theory. Baseline survey results were used to design the process improvement project. Results of the follow-up survey indicate that researchers who participated in some aspect of the process improvement project (i.e. attending a policy café, using the redesigned website, or reading the new Quick Reference Guide) reported higher levels of policy communication and knowledge and more positive attitudes toward the COI policy than researchers who had not engaged with process improvement efforts. We offer theoretical and practical implications of results for organizational communication scholars and practitioners. 相似文献
153.
期刊评价中文献老化理论视角的研究相对薄弱。本文探究生存分析法在学术期刊评价上的应用,在理论上
克服了因领域差异导致的壁垒,并选取CSTPCD中30家中文物理学科期刊作为样本数据集进行实证研究。通过对论文
被引时序数据进行分析,研究物理学科文献老化规律,并选取样本期刊进行对比分析,以探究期刊评价的新思路。 相似文献
154.
As one of the largest active academic social networking sites, ResearchGate (RG) has been utilized by scholars to share publications, seek collaborators, communicate work in progress, and build scholarly reputation. This study collects data from RG users from 61 U.S. research universities at different research activity levels, as categorized by the Carnegie Classification of Institutions of Higher Education, to examine the impact of institutional differences on RG reputational metrics. The results confirm that RG is a research-oriented academic social networking site that closely and realistically mirrors the research activity level of institutions. With an increase in the research activity level of a university, its affiliated RG users tend to have higher RG scores, more publications and citations, and more profile views and followers, while the average number of reads of their publications and followees tend to be lower and fluctuant. In addition, RG users primarily follow others from institutions of a higher research activity level, forming virtual social networks centered around esteemed institutions. The study suggests academic social networks can serve as indicators in evaluation of research activities among research institutions, and such sites can be helpful and credible for acquiring resources, keeping informed about research, and promoting academic influence. 相似文献
155.
We have studied the efficiency of research in the EU by a percentile-based citation approach that analyzes the distribution of country papers among the world papers. Going up in the citation scale, the frequency of papers from efficient countries increases while the frequency from inefficient countries decreases. In the percentile-based approach, this trend, which is uniform at any citation level, is measured by the ep index that equals the Ptop 1%/Ptop 10% ratio. By using the ep index we demonstrate that EU research on fast-evolving technological topics is less efficient than the world average and that the EU is far from being able to compete with the most advanced countries. The ep index also shows that the USA is well ahead of the EU in both fast- and slow-evolving technologies, which suggests that the advantage of the USA over the EU in innovation is due to low research efficiency in the EU. In accord with some previous studies, our results show that the European Commission’s ongoing claims about the excellence of EU research are based on a wrong diagnosis. The EU must focus its research policy on the improvement of its inefficient research. Otherwise, the future of Europeans is at risk. 相似文献
156.
157.
针对观赏园艺公司存在的主要问题,引入增值管理的理念,从市场预测、供求风险、产品生产、产品养护、产品高附加值和人力资本等6个方面,详细阐释了增值管理的措施;探讨并建立了评价体系和指标,为优化观赏园艺公司的管理提供了新思路。 相似文献
158.
无形资产评估存在的问题及对策 总被引:1,自引:0,他引:1
针对无形资产的评估定价不被多数人了解和重视的问题,在分析无形资产评估的基础上,着重从无形资产评估中的几个问题进行理论分析和研究,并提出了评估师应加强理论的学习和研究,拓宽无形资产的界定范围,建立完善评估准则,建立健全无形资产评估的法律体系,规范无形资产评估报告的披露等建议及对策。 相似文献
159.
160.
深入研究区域协同创新的理论机制,对于提高区域创新效率、提升区域发展竞争力具有重要意义。从系统
论的角度出发,论述区域协同理论及机制,分析国内外协同创新模式,综合借鉴已有的相关评价指标体系,确立了4 项
一级指标、11项二级指标、32个三级指标,采用层次分析法和专家咨询法确定指标权重,构建了区域性协同创新能力
评价指标体系。对15个副省级城市区域性协同创新能力进行实证分析和评价,找出影响区域性协同创新能力的主要因
素,分析济南市协同创新存在的主要问题,提出推动当地协同创新发展的对策与建议。 相似文献