全文获取类型
收费全文 | 1389篇 |
免费 | 18篇 |
国内免费 | 3篇 |
专业分类
教育 | 1143篇 |
科学研究 | 61篇 |
各国文化 | 11篇 |
体育 | 56篇 |
综合类 | 2篇 |
文化理论 | 4篇 |
信息传播 | 133篇 |
出版年
2023年 | 5篇 |
2022年 | 10篇 |
2021年 | 29篇 |
2020年 | 32篇 |
2019年 | 38篇 |
2018年 | 51篇 |
2017年 | 67篇 |
2016年 | 52篇 |
2015年 | 43篇 |
2014年 | 55篇 |
2013年 | 284篇 |
2012年 | 54篇 |
2011年 | 51篇 |
2010年 | 36篇 |
2009年 | 40篇 |
2008年 | 48篇 |
2007年 | 34篇 |
2006年 | 35篇 |
2005年 | 22篇 |
2004年 | 25篇 |
2003年 | 30篇 |
2002年 | 26篇 |
2001年 | 19篇 |
2000年 | 29篇 |
1999年 | 18篇 |
1998年 | 14篇 |
1997年 | 17篇 |
1996年 | 23篇 |
1995年 | 20篇 |
1994年 | 19篇 |
1993年 | 20篇 |
1992年 | 18篇 |
1991年 | 10篇 |
1990年 | 13篇 |
1989年 | 6篇 |
1988年 | 10篇 |
1987年 | 6篇 |
1986年 | 5篇 |
1985年 | 9篇 |
1984年 | 13篇 |
1983年 | 9篇 |
1982年 | 9篇 |
1981年 | 10篇 |
1980年 | 8篇 |
1979年 | 5篇 |
1978年 | 9篇 |
1977年 | 5篇 |
1976年 | 6篇 |
1975年 | 3篇 |
1973年 | 3篇 |
排序方式: 共有1410条查询结果,搜索用时 46 毫秒
101.
Kenneth J. Leising Jared Wong Chad M. Ruprecht Aaron P. Blaisdell 《Learning & behavior》2014,42(4):357-364
Many studies investigating cue competition have focused on the blocking effect. We investigated the blocking effect with pigeons using a landmark-based spatial search task in both a touchscreen preparation (Exp. 1a) and an automated remote environmental navigation apparatus (Exp. 1b). In Phase 1, two landmarks (LMs: A and Z) appeared on separate trials as colored circles among a row of eight (touchscreen) or six (ARENA) identical response units. Subjects were rewarded for pecking at a target response unit to the right of LM A and to the left of an extraneous LM, Z. During the blocking trials in Phase 2, LM X was presented in compound with a second LM (A) that had been previously trained. On control trials, LM Y was presented in compound with LM B and a target in the same manner as in the trials of AX, except that neither landmark had previously been trained with the target. All subjects were then tested with separate trials of A, X, B, and Y. Testing revealed poor spatial control by X relative to A and Y. We report the first evidence for a spatial-blocking effect in pigeons and additional support for associative effects (e.g., blocking) occurring under similar conditions (e.g., training sessions, spatial relationships, etc.) in 3-D and 2-D search tasks. 相似文献
102.
Sandra S. Liu 《Higher Education Quarterly》1995,49(1):4-16
British universities have always been the market leader in recruiting Hong Kong students to study overseas or to take part in learning programmes. As the transfer of Hong Kong's sovereignty to the People's Republic of China (PRC) in 1997 approaches, some changes in market demands and incoming competitors have complicated the external environment of the market for higher education in Hong Kong. A major impetus for the incoming rivalry of the PRC is the recognition of qualifications obtained in PRC by the Hong Kong Government and continuing economic growth which in turn creates a tremendous demand for professional and managerial personnel in PRC. With the current sophisticated marketing practices and quality services to potential customers, this article attempts to provide information that may help British universities to discover their competitive edge in capitalizing on the experience and strengths of their higher education tradition and system. 相似文献
103.
104.
105.
106.
107.
108.
109.
Requests for monographs generated within an interlibrary loan network are analyzed for half-life statistics. It is suggested that demand represents use of the literature more completely than satisfied requests or circulation statistics. Demand in this study is characterized as either regional demand or statewide demand and is related to the level of the network where final processing of the request occurs. A negative exponential distribution is found to adequately characterize both levels of demand as a function of publication date for four subject categories. Corrected demand data is obtained by removing the growth rate of most of the available literature represented by American book publisher output. Based on over 10,000 interlibrary loan requests, negative exponential distributions describe the raw data as well as the corrected data. A shorter half-life was found for regional library demand (10.47 yr) than that found for statewide library demand (15.75 yr). Applying the correction factor to reflect the growth rate of the available literature tends to increase the half-life when compared to the raw data, and changes the ordering of subject classes with respect to ascending half-lives. 相似文献
110.