全文获取类型
收费全文 | 23482篇 |
免费 | 208篇 |
专业分类
23690篇 |
出版年
2024年 | 7篇 |
2023年 | 24篇 |
2022年 | 20篇 |
2021年 | 52篇 |
2020年 | 86篇 |
2019年 | 94篇 |
2018年 | 3582篇 |
2017年 | 2908篇 |
2016年 | 2357篇 |
2015年 | 299篇 |
2014年 | 198篇 |
2013年 | 534篇 |
2012年 | 762篇 |
2011年 | 2543篇 |
2010年 | 2591篇 |
2009年 | 1583篇 |
2008年 | 1844篇 |
2007年 | 2296篇 |
2006年 | 184篇 |
2005年 | 330篇 |
2004年 | 264篇 |
2003年 | 229篇 |
2002年 | 148篇 |
2001年 | 66篇 |
2000年 | 92篇 |
1999年 | 61篇 |
1998年 | 62篇 |
1997年 | 53篇 |
1996年 | 40篇 |
1995年 | 32篇 |
1994年 | 32篇 |
1993年 | 43篇 |
1992年 | 19篇 |
1991年 | 22篇 |
1990年 | 24篇 |
1989年 | 9篇 |
1988年 | 15篇 |
1987年 | 11篇 |
1986年 | 12篇 |
1985年 | 14篇 |
1984年 | 25篇 |
1983年 | 12篇 |
1982年 | 17篇 |
1981年 | 11篇 |
1980年 | 14篇 |
1979年 | 12篇 |
1977年 | 9篇 |
1976年 | 13篇 |
1973年 | 6篇 |
1972年 | 6篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
71.
72.
It has been recently shown that in the early stages of erection, the human penis undergoes a substantial length change that is not detected using circumferential measurement devices. The present report introduces a relatively simple device that can assess changes in both length and circumference. The device promises to provide a low-cost alternative to the precision and sensitivity associated with plethysmography. 相似文献
73.
Christopher M. Massad Michael Hubbard Darren Newtson 《Journal of experimental social psychology》1979,15(6):513-532
Two hundred and twelve subjects were given one of two interpretive sets prior to viewing an event. Following observation, the first interpretation was discredited, and subjects were asked to interpret the event they had seen under the contrasting set. Some subjects were only provided with the alternate interpretation, while others were also given an opportunity to view the event a second time. Both the perceptual segmentation and the subjects' impressions of the participants in the event were assessed. Results disclosed that (1) the two sets produced both differing perceptual organization and differing impressions of the participants; (2) reversing the sets produced a reversal of the impressions of the participants only when accompanied by a second viewing; and (3) the reversal of the impressions was accompanied by a shift in the perceptual organization of the event. It was concluded that observers may differ in their initial perception of an event as the result of differences in prior expectations, and that the resulting biased sample of information they acquire may limit their retrospective reinterpretation of the event. 相似文献
74.
Christopher Dare 《Journal of Family Therapy》1979,1(2):137-151
This paper describes three frames of reference for understanding family function. The three frames are (1) The Life-cycle of the Family, (2) The Intergenerational, Historical Aspects of the Family, (3) The Interactional Structure of the Family. It is suggested that these three frames can provide a detailed formulation of family functioning and disturbance in order to plan rational foci, strategies, techniques and aims of family therapy. 相似文献
75.
76.
77.
Two levels of confinement duration (5 or 60 sec) in either startbox or goalbox were factorially combined with presence or absence of shock during extinction of a runway escape response in a self-punitive paradigm under a spaced-trials procedure. All groups were equated for amount and temporal spacing of handling before and after each trial. Shocked rats were more resistant to extinction than nonshocked rats only when startbox confinement was short. When startbox confinement was long, shock facilitated extinction. Long goalbox confinement enhanced running speed for shocked rats, but only in the presence of shock. It was suggested that duration of startbox confinement affects strength of conditioned fear, with long confinement leading to its extinction. 相似文献
78.
79.
80.