全文获取类型
| 收费全文 | 10843篇 |
| 免费 | 130篇 |
| 国内免费 | 7篇 |
专业分类
| 教育 | 7257篇 |
| 科学研究 | 1298篇 |
| 各国文化 | 351篇 |
| 体育 | 782篇 |
| 综合类 | 5篇 |
| 文化理论 | 81篇 |
| 信息传播 | 1206篇 |
出版年
| 2021年 | 103篇 |
| 2020年 | 136篇 |
| 2019年 | 198篇 |
| 2018年 | 255篇 |
| 2017年 | 281篇 |
| 2016年 | 250篇 |
| 2015年 | 171篇 |
| 2014年 | 223篇 |
| 2013年 | 2106篇 |
| 2012年 | 231篇 |
| 2011年 | 226篇 |
| 2010年 | 205篇 |
| 2009年 | 205篇 |
| 2008年 | 271篇 |
| 2007年 | 259篇 |
| 2006年 | 213篇 |
| 2005年 | 190篇 |
| 2004年 | 205篇 |
| 2003年 | 151篇 |
| 2002年 | 158篇 |
| 2001年 | 172篇 |
| 2000年 | 204篇 |
| 1999年 | 194篇 |
| 1998年 | 107篇 |
| 1997年 | 108篇 |
| 1996年 | 101篇 |
| 1995年 | 81篇 |
| 1994年 | 75篇 |
| 1993年 | 91篇 |
| 1992年 | 160篇 |
| 1991年 | 145篇 |
| 1990年 | 160篇 |
| 1989年 | 170篇 |
| 1988年 | 124篇 |
| 1987年 | 127篇 |
| 1986年 | 129篇 |
| 1985年 | 171篇 |
| 1984年 | 132篇 |
| 1983年 | 112篇 |
| 1982年 | 106篇 |
| 1981年 | 82篇 |
| 1980年 | 97篇 |
| 1979年 | 147篇 |
| 1978年 | 107篇 |
| 1977年 | 89篇 |
| 1976年 | 94篇 |
| 1975年 | 73篇 |
| 1974年 | 96篇 |
| 1973年 | 83篇 |
| 1971年 | 80篇 |
排序方式： 共有10000条查询结果，搜索用时 234 毫秒
1.
2.
Children are sensitive to a number of considerations influencing distributions of resources, including equality, equity, and reciprocity. We tested whether children use a specific type of reciprocity norm—market norms—in which resources are distributed differentially based strictly on amount offered in return. In two studies, 195 children 5–10 years and 60 adults distributed stickers to friends offering same or different amounts of money. Overall, participants distributed more equally when offers were the same and more unequally when offers were different. Although sensitive to why friends offered different amounts of money, children increasingly incorporated market norms into their distributions with age, as the oldest children and adults distributed more to those offering more, irrespective of the reasons provided. 相似文献
3.
ABSTRACT This article offers a textual analysis and semiotic reading of the Rich Kids of Tehran's (RKOT’s) Instagram page. Contributing to scholarship on Iranian youth media practices, this article interrogates how the RKOT navigate urban and rural space to engage in everyday processes of resistance against global and local systemic oppression. Grounding their visual representations on Instagram in historical and cultural context, the author questions how and when quotidian actions are transformed into political transgressions when posted on social media. This article emphasizes the RKOT's agency in shaping their brand by analyzing representations of gender performance, intertextuality, and national identity on Instagram. 相似文献
4.
In the IR field it is clear that the value of a system depends on the cost and benefit profiles of its users. It would seem obvious that different users would prefer different systems. In the TREC-9 filtering track, systems are evaluated by a utility measure specifying a given cost and benefit. However, in the study of decision systems it is known that, in some cases, one system may be unconditionally better than another. In this paper we employ a decision theoretic approach to find conditions under which an Information Filtering (IF) system is unconditionally superior to another for all users regardless of their cost and benefit profiles.It is well known that if two IF systems have equal precision the system with better recall will be preferred by all users. Similarly, with equal recall, better precision is universally preferred. We confirm these known results and discover an unexpected dominance relation in which a system with lower recall will be universally preferred provided its precision is sufficiently higher. 相似文献
5.
6.
7.
8.
9.
10.
Sports Engineering - A Monark cycle ergometer is a device globally used in physiological studies to measure the work and energy levels of exercising humans. In this paper a rope-braked cycle... 相似文献