首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   8438篇
  免费   145篇
  国内免费   7篇
教育   6190篇
科学研究   500篇
各国文化   167篇
体育   697篇
综合类   3篇
文化理论   130篇
信息传播   903篇
  2023年   25篇
  2022年   48篇
  2021年   78篇
  2020年   152篇
  2019年   216篇
  2018年   298篇
  2017年   315篇
  2016年   297篇
  2015年   225篇
  2014年   242篇
  2013年   1884篇
  2012年   230篇
  2011年   236篇
  2010年   209篇
  2009年   192篇
  2008年   282篇
  2007年   213篇
  2006年   209篇
  2005年   198篇
  2004年   161篇
  2003年   185篇
  2002年   168篇
  2001年   133篇
  2000年   119篇
  1999年   113篇
  1998年   106篇
  1997年   109篇
  1996年   118篇
  1995年   123篇
  1994年   118篇
  1993年   92篇
  1992年   115篇
  1991年   110篇
  1990年   99篇
  1989年   89篇
  1988年   78篇
  1987年   69篇
  1986年   56篇
  1985年   67篇
  1984年   56篇
  1983年   70篇
  1982年   73篇
  1981年   71篇
  1980年   75篇
  1979年   67篇
  1978年   47篇
  1977年   41篇
  1976年   49篇
  1975年   40篇
  1974年   32篇
排序方式: 共有8590条查询结果,搜索用时 93 毫秒
81.
82.
Using a participatory learning approach, we report on the delivery and evaluation of a climate change and risk assessment tool to help manage water risks within the agricultural sector. Post-graduate water-professional students from a range of countries, from both developed and emerging economies were involved in using this tool. Our approach included participative learning tools – group discussion, software, and risk matrices. The materials developed met the needs of the students, allowing these students to incorporate their learning and adapt the package of materials for use in their home countries. Analysis of evaluations show that the tools and materials are particularly useful and emphasizes the need for sound learning materials and tools, funding to deliver training, and policy support to accelerate education and adoption of authentic climate change adaptation practices. The expected benefits for water professionals about climate change will be translated into improved socioeconomic and environmental outcomes if adopted.  相似文献   
83.
84.
85.
David Demortain 《Minerva》2017,55(2):139-159
Regulating technologies, innovations and risks is an activity that, as much as scientific research needs proofs and evidence. It is the site of development of a distinct kind of science, regulatory science. This special issue addresses the question of the standards of knowledge governing how we test, assess and monitor technologies and their effects. This topic is relevant and timely in the light of problematics of regulation of innovation, regulatory failure and capture. Given the enormous decisions and stakes regulatory science commends, it becomes crucial to ask where its standards come from and gain credibility, but also what valuations of technology and appreciations of their risks or benefits do they embed, and who controls them? This paper introduces the four contributions comprising the special issue, and outlines a perspective from which to question the construction of regulatory science or, in the terminology adopted here, the authorization and standardization of regulatory knowledge, particularly the role of networks of scientific experts therein.  相似文献   
86.
87.
Since Cronbach's (1951) elaboration of α from its introduction by Guttman (1945), this coefficient has become ubiquitous in characterizing assessment instruments in education, psychology, and other social sciences. Also ubiquitous are caveats on the calculation and interpretation of this coefficient. This article summarizes a recent contribution (Andrich, 2015) on the use of coefficient α which complements these many caveats. It shows that in the presence of a simple bifactor structure of a scale where unique components of variance are homogeneous in magnitude, three components of variance and the common latent common correlation among the subscales can be calculated from the ratio of two calculations of α, one at the level of the items, the other at the level of the subscales. It was suggested that these two ready calculations and their interpretation, and the reporting of all four indices in the analysis of scales with a subscale structure, would reduce the misinterpretation of this coefficient. An illustrative example of the application of the calculations is also shown.  相似文献   
88.
The library channel is often underappreciated as a key part of a publisher’s business strategy. In an age where publishers are constantly seeking new revenue and marketing opportunities, presence in the library—digitally—can yield significant growth. This paper examines the library channel, its business model based on library lending, the performance of eBooks and audiobooks across all subjects, and consumer reading behavior. Digital Book Clubs, a relatively new phenomenon, are also defined and illustrated with examples demonstrating the library’s valuable role in increasing discoverability and ultimately sales.  相似文献   
89.
近年来,在收购或兼并后整合两个公司已变成一种高度复杂化的操作。尽管出现了“科学的”进步,高管们仍对自己收购艺术的能力深感沮丧。  相似文献   
90.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号