全文获取类型
收费全文 | 26664篇 |
免费 | 469篇 |
国内免费 | 306篇 |
专业分类
教育 | 17970篇 |
科学研究 | 3059篇 |
各国文化 | 202篇 |
体育 | 1968篇 |
综合类 | 732篇 |
文化理论 | 138篇 |
信息传播 | 3370篇 |
出版年
2022年 | 245篇 |
2021年 | 531篇 |
2020年 | 458篇 |
2019年 | 483篇 |
2018年 | 613篇 |
2017年 | 699篇 |
2016年 | 645篇 |
2015年 | 700篇 |
2014年 | 956篇 |
2013年 | 4009篇 |
2012年 | 1164篇 |
2011年 | 1238篇 |
2010年 | 1151篇 |
2009年 | 1055篇 |
2008年 | 1085篇 |
2007年 | 1100篇 |
2006年 | 1070篇 |
2005年 | 941篇 |
2004年 | 570篇 |
2003年 | 536篇 |
2002年 | 538篇 |
2001年 | 634篇 |
2000年 | 437篇 |
1999年 | 402篇 |
1998年 | 288篇 |
1997年 | 251篇 |
1996年 | 256篇 |
1995年 | 196篇 |
1994年 | 208篇 |
1993年 | 182篇 |
1992年 | 254篇 |
1991年 | 224篇 |
1990年 | 253篇 |
1989年 | 227篇 |
1988年 | 178篇 |
1987年 | 182篇 |
1986年 | 189篇 |
1985年 | 180篇 |
1984年 | 184篇 |
1983年 | 171篇 |
1982年 | 135篇 |
1981年 | 138篇 |
1980年 | 134篇 |
1979年 | 190篇 |
1978年 | 162篇 |
1977年 | 113篇 |
1976年 | 119篇 |
1975年 | 111篇 |
1973年 | 104篇 |
1971年 | 116篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
Medicine has made increasing use of meta-analysis, largely as a quantitative procedure for combining results of clinical trials. Meta-analysis begins with a comprehensive review of the literature. The next step is a systematic analysis of the quality and content of each study. Finally, results are combined statistically and conclusions are drawn from this new overview of the data. This paper presents a brief historical perspective on the use of meta-analysis in medicine with emphasis on the medical library. The authors conclude that in the future, medical librarians will play a significant role in the application of this useful technique. 相似文献
52.
Chaos theory, informational needs, and natural disasters 总被引:2,自引:0,他引:2
Timothy L. Sellnow Matthew W. Seeger Robert R. Ulmer 《Journal of Applied Communication Research》2002,30(4):269-292
This study applies chaos theory to a system-wide analysis of crisis communication in a natural disaster. Specifically, we analyze crisis communication during the 1997 Red River Valley flood in Minnesota and North Dakota. This flood, among the worst in modern American history, consumed entire metropolitan areas, displacing thousands of people. The conditions and decisions leading to the disaster, and the subsequent reactions are retraced. Communication related to river crest predictions (fractals), the shock at the magnitude of the crisis (cosmology episode), novel forms of reorganizing (self-organization), and agencies that aided in establishing a renewed order (strange attractors) are evaluated. Ultimately, we argue that preexisting sensemaking structures favoring rationalized, traditional views of a complex system led officials to make inappropriately unequivocal predictions and ultimately diminished the effectiveness of the region's crisis communication and planning. 相似文献
53.
54.
55.
56.
Maureen L. Mackenzie 《Library & information science research》2002,24(4):611
Executives recognize the value of maintaining access to information. More managers filter their own e-mail rather than have assistants do this task. Organizing and storing data for future use are left to the personal preference of the individual manager. Is this in the best interest of the organization? Are data being stored in a manner causing them to be irretrievable in the future? Are irrelevant data being stored? This study investigates the strategies used to store and retrieve e-mail. The results revealed that the primary search strategy was a reliance on memory. The labels assigned to the e-mail folders triggered the user's memory. Although, in the short term, memory is sufficient for organizing and retrieving information, the lack of transferability and preservation of this information poses a danger. The association between the electronic file label and the stored information is unique to the manager and may lead to inaccessibility of relevant corporate knowledge in the future. 相似文献
57.
我国体育经纪人发展状况概述 总被引:3,自引:0,他引:3
对我国经纪人的出现及其产生的社会历史背景做简要的回顾,进而对体育经纪人在中国的兴起及学科研究的现状进行分析总结,并提出对该领域发展前景的看法。 相似文献
58.
This article reviews the literature pertaining to the written composing ability of students with learning disabilities that was published primarily in the decade from 1980 to 1990. The papers included are either reports of research or discussions of instructional procedures that are based on research. The topics addressed include story composition, expository writing, training/intervention research, and rationales/procedures for instruction. 相似文献
60.
TFPS 教学用运动技术影片分析系统(Teaching's Film Processing System)的应用,彻底改变了以往影片分析方法教学的一般性介绍的状况,以实验部分为核心,采用新的教学方法,借助新的教学仪器,使理论与实践相结合,大大加深了学生对这一方法的理论知识的理解和掌握,同时使学生亲自动手实验,掌握实际实验技能,大大提高了进行运动技术分析的研究能力,填补了这一教学领域的空白,使这一领域的教学水平和教学质量达到了国内领先水平和国际先进水平。 相似文献