全文获取类型
收费全文 | 23730篇 |
免费 | 203篇 |
专业分类
23933篇 |
出版年
2024年 | 7篇 |
2023年 | 39篇 |
2022年 | 41篇 |
2021年 | 73篇 |
2020年 | 81篇 |
2019年 | 114篇 |
2018年 | 3573篇 |
2017年 | 2920篇 |
2016年 | 2365篇 |
2015年 | 302篇 |
2014年 | 202篇 |
2013年 | 511篇 |
2012年 | 748篇 |
2011年 | 2554篇 |
2010年 | 2610篇 |
2009年 | 1567篇 |
2008年 | 1856篇 |
2007年 | 2280篇 |
2006年 | 152篇 |
2005年 | 305篇 |
2004年 | 280篇 |
2003年 | 232篇 |
2002年 | 150篇 |
2001年 | 102篇 |
2000年 | 133篇 |
1999年 | 69篇 |
1998年 | 60篇 |
1997年 | 51篇 |
1996年 | 28篇 |
1995年 | 24篇 |
1994年 | 22篇 |
1993年 | 15篇 |
1992年 | 37篇 |
1991年 | 27篇 |
1990年 | 52篇 |
1989年 | 43篇 |
1988年 | 37篇 |
1987年 | 21篇 |
1986年 | 30篇 |
1985年 | 29篇 |
1984年 | 22篇 |
1983年 | 18篇 |
1982年 | 16篇 |
1981年 | 10篇 |
1980年 | 8篇 |
1979年 | 15篇 |
1978年 | 11篇 |
1972年 | 11篇 |
1966年 | 6篇 |
1938年 | 6篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
92.
G. M. van der Molen M. A. van den Hout J. Vroemen H. Lousberg E. Griez 《Behaviour research and therapy》1986,24(6):677-680
The effects of lactate infusion on subjective mood change were studied in two differently instructed groups, in a double-blind, placebo-controlled, cross-over study. Ss who were told that infusions would produce anxiety reported a significant change in the expected direction after lactate but not after glucose. Ss who were told that infusions would produce a state of pleasant excitement showed no change after either infusion. The possible role of cognitive parameters in experimentally-induced anxiety is discussed. 相似文献
93.
Substance P facilitation of memory: effects in an appetitively motivated learning task 总被引:1,自引:0,他引:1
K Schlesinger M A Pelleymounter J van de Kamp D L Bader J M Stewart T N Chase 《Behavioral and neural biology》1986,45(2):230-239
Food deprived, heterogeneous strain (HS/IBG) mice were trained on two different discrimination tasks for food reinforcement. In one experiment animals were trained to make spatial discriminations in a T maze. Immediately after training they were given subcutaneous injections of either substance P (1 ng/g) or vehicle. Twenty-four hours later the animals were given reversal training in the same maze. The results showed that substance P-treated animals took significantly longer to acquire the reversal habit than did control mice. In a second experiment, animals were trained to make visual discriminations in a T maze. Immediately after reaching acquisition criterion animals were injected with either substance P (1 ng/g) or vehicle. Different groups of mice were retrained on the same task either 1, 2, 3, or 7 days after original learning. Savings scores were calculated and, at every interval, substance P-treated mice retained the task better than control animals. One interpretation of these data is that substance P-treated mice remembered the original task significantly better than vehicle-injected control animals. 相似文献
94.
95.
96.
97.
Synthese - The paradox of phase transitions raises the problem of how to reconcile the fact that we see phase transitions happen in concrete, finite systems around us, with the fact that our best... 相似文献
98.
99.
100.
Mary Jo Neitz 《Review of religious research》2016,58(4):573-574