全文获取类型
收费全文 | 49573篇 |
免费 | 1975篇 |
国内免费 | 27篇 |
出版年
2020年 | 629篇 |
2019年 | 774篇 |
2018年 | 1049篇 |
2017年 | 1111篇 |
2016年 | 1135篇 |
2015年 | 792篇 |
2014年 | 1001篇 |
2013年 | 4302篇 |
2012年 | 1780篇 |
2011年 | 1810篇 |
2010年 | 1143篇 |
2009年 | 1140篇 |
2008年 | 1615篇 |
2007年 | 1623篇 |
2006年 | 1521篇 |
2005年 | 1349篇 |
2004年 | 1256篇 |
2003年 | 1226篇 |
2002年 | 1227篇 |
2001年 | 1374篇 |
2000年 | 1305篇 |
1999年 | 1059篇 |
1998年 | 545篇 |
1997年 | 560篇 |
1996年 | 513篇 |
1995年 | 501篇 |
1994年 | 479篇 |
1993年 | 477篇 |
1992年 | 858篇 |
1991年 | 780篇 |
1990年 | 822篇 |
1989年 | 710篇 |
1988年 | 716篇 |
1987年 | 700篇 |
1986年 | 722篇 |
1985年 | 688篇 |
1984年 | 647篇 |
1983年 | 601篇 |
1982年 | 464篇 |
1981年 | 451篇 |
1980年 | 449篇 |
1979年 | 662篇 |
1978年 | 505篇 |
1975年 | 536篇 |
1974年 | 588篇 |
1973年 | 606篇 |
1972年 | 442篇 |
1969年 | 436篇 |
1968年 | 497篇 |
1967年 | 453篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
992.
993.
Group sessions with wives of aphasic patients 总被引:1,自引:0,他引:1
J L Bardach 《International journal of group psychotherapy》1969,19(3):361-365
994.
995.
996.
This article describes an electronic switch that allows presentation of sine wave stimuli without the often undesirable transient thump, thud, or click usually caused by ordinary electromechanical switches. 相似文献
997.
Lawrence L. Feth 《Behavior research methods》1970,2(4):169-171
A noise generator that is capable of delivering long-duration samples of reproducible noise is described. The noise is generated as a pseudorandom telegraph waveform but may be filtered so that its amplitude distribution is approximately Gaussian. The design and construction of the generator are detailed and a few possible applications are given. 相似文献
998.
An electronic aid to assist in administering concept-identification problems with floating solutions is described. Digital circuitry generates all combination pairs from four selection switches, presents a particular comparison of these pairs, and, on command of the E, eliminates selected pairs from future comparisons. Each comparison is designed to minimize the information fed back to the S. The apparatus is used to administer and evaluate performance on conjunctive and disjunctive problems that are matched for information gain. 相似文献
999.
L. J. Herberg J. E. Blundell 《Quarterly journal of experimental psychology (2006)》1970,22(2):133-141
Lesions of the hypothalamic ventromedial nucleus (VMN) led to an immediate increase in food intake but not to any increase in hoarding activity. Later, when subjects were very obese, they failed to hoard even in response to a 16-hr. deprivation schedule, although this schedule did produce hoarding if body weights were held at, or were brought down to, preoperative levels. These results indicate that the lateral hypothalamic mechanism responsible for hoarding and feeding responds to long-term nutritional factors, and that it is not directly affected by the short-term satiety mechanisms in the VMN. These findings support the hypothesis (a) that even “non-physiological” activities (e.g. hoarding, exploration) are motivated by physiological needs, and (b) that the reason these activities do not ordinarily covary with physiological drives is that, unlike the physiological drives, they are not subject to inhibition by the hypothalamic satiety mechanisms. 相似文献
1000.