全文获取类型
| 收费全文 | 20305篇 |
| 免费 | 108篇 |
| 国内免费 | 8篇 |
专业分类
| 教育 | 15018篇 |
| 科学研究 | 2206篇 |
| 各国文化 | 53篇 |
| 体育 | 1021篇 |
| 综合类 | 3篇 |
| 文化理论 | 444篇 |
| 信息传播 | 1676篇 |
出版年
| 2022年 | 56篇 |
| 2021年 | 119篇 |
| 2020年 | 161篇 |
| 2019年 | 225篇 |
| 2018年 | 2458篇 |
| 2017年 | 2334篇 |
| 2016年 | 1842篇 |
| 2015年 | 294篇 |
| 2014年 | 439篇 |
| 2013年 | 1649篇 |
| 2012年 | 431篇 |
| 2011年 | 916篇 |
| 2010年 | 1036篇 |
| 2009年 | 623篇 |
| 2008年 | 855篇 |
| 2007年 | 1316篇 |
| 2006年 | 254篇 |
| 2005年 | 547篇 |
| 2004年 | 615篇 |
| 2003年 | 480篇 |
| 2002年 | 257篇 |
| 2001年 | 209篇 |
| 2000年 | 230篇 |
| 1999年 | 191篇 |
| 1998年 | 98篇 |
| 1997年 | 139篇 |
| 1996年 | 102篇 |
| 1995年 | 78篇 |
| 1994年 | 92篇 |
| 1993年 | 68篇 |
| 1992年 | 153篇 |
| 1991年 | 128篇 |
| 1990年 | 113篇 |
| 1989年 | 141篇 |
| 1988年 | 123篇 |
| 1987年 | 98篇 |
| 1986年 | 106篇 |
| 1985年 | 102篇 |
| 1984年 | 77篇 |
| 1983年 | 90篇 |
| 1982年 | 61篇 |
| 1981年 | 60篇 |
| 1980年 | 57篇 |
| 1979年 | 99篇 |
| 1978年 | 63篇 |
| 1977年 | 61篇 |
| 1976年 | 51篇 |
| 1975年 | 48篇 |
| 1974年 | 58篇 |
| 1973年 | 52篇 |
排序方式： 共有10000条查询结果，搜索用时 15 毫秒
1.
2.
David Kaldewey 《Minerva》2018,56(2):161-182
This article analyzes the concept of “grand challenges” as part of a shift in how scientists and policymakers frame and communicate their respective agendas. The history of the grand challenges discourse helps to understand how identity work in science and science policy has been transformed in recent decades. Furthermore, the question is raised whether this discourse is only an indicator, or also a factor in this transformation. Building on conceptual history and historical semantics, the two parts of the article reconstruct two discursive shifts. First, the observation that in scientific communication references to “problems” are increasingly substituted by references to “challenges” indicates a broader cultural trend of how attitudes towards what is problematic have shifted in the last decades. Second, as the grand challenges discourse is rooted in the sphere of sports and competition, it introduces a specific new set of societal values and practices into the spheres of science and technology. The article concludes that this process can be characterized as the sportification of science, which contributes to self-mobilization and, ultimately, to self-optimization of the participating scientists, engineers, and policymakers. 相似文献
3.
4.
5.
6.
7.
8.
Anthony J. Sadar 《Science & Education》2018,27(1-2):233-235
9.
Piret Luik Reelika Suviste Marina Lepp Tauno Palts Eno Tõnisson Merilin Säde Kaspar Papli 《British journal of educational technology : journal of the Council for Educational Technology》2019,50(1):153-165
Learners who enrol in massive open online courses (MOOCs) have different backgrounds and tend to have different motivations than learners in traditional courses. Based on value-expectancy theory, an instrument was developed to measure motivation for enrolling in a programming MOOC. A study with 1229 adult participants in Estonian-language programming course “About Programming” was conducted to validate the instrument. Results of confirmatory factor analysis validated the 7-factor scale named factors influencing enrolment in MOOC (FIEM). FIEM comprises three factors of expectancies, three factors of values and one factor of social influence. The highest and lowest rated motivational factors influencing enrolment in programming MOOC are discussed in the paper. Interest in and expectations for the course, personal suitability of distance learning and suitability for family and work are the highest-rated motivational factors for those who enrol in MOOC. Usefulness related to own children, social influence and usefulness to related to certification were the lowest rated. The results of this study can be useful for designers of programming MOOCs and the developed scale might be used in future studies. 相似文献
10.
Megan K. Schraedley Hamilton Bean Sarah E. Dempsey Mohan J. Dutta Kathleen P. Hunt Sonia R. Ivancic 《Journal of Applied Communication Research》2020,48(2):166-185
ABSTRACTThis forum brings together food, (in)security, and communication. The authors participating in this forum center communication as both process and tool for understanding, mitigating, and making meaning of food (in)security. The nine authors together discuss the role of communication in food (in)security, the central challenges for scholars and practitioners working on food (in)security, and the creative possibilities and impacts influencing the future of food (in)security. The forum produces a call for applied scholars to re-imagine communication frameworks in order to make meaningful differences in their communities. 相似文献