全文获取类型
收费全文 | 44240篇 |
免费 | 1868篇 |
国内免费 | 14篇 |
出版年
2020年 | 457篇 |
2019年 | 588篇 |
2018年 | 836篇 |
2017年 | 817篇 |
2016年 | 844篇 |
2015年 | 611篇 |
2014年 | 739篇 |
2013年 | 3294篇 |
2012年 | 1346篇 |
2011年 | 1438篇 |
2010年 | 875篇 |
2009年 | 823篇 |
2008年 | 1235篇 |
2007年 | 1193篇 |
2006年 | 1128篇 |
2005年 | 999篇 |
2004年 | 960篇 |
2003年 | 872篇 |
2002年 | 917篇 |
2001年 | 1393篇 |
2000年 | 1287篇 |
1999年 | 970篇 |
1998年 | 524篇 |
1996年 | 419篇 |
1992年 | 752篇 |
1991年 | 766篇 |
1990年 | 731篇 |
1989年 | 734篇 |
1988年 | 725篇 |
1987年 | 682篇 |
1986年 | 677篇 |
1985年 | 739篇 |
1984年 | 611篇 |
1983年 | 553篇 |
1982年 | 483篇 |
1981年 | 446篇 |
1979年 | 678篇 |
1978年 | 481篇 |
1977年 | 421篇 |
1976年 | 461篇 |
1975年 | 574篇 |
1974年 | 650篇 |
1973年 | 692篇 |
1972年 | 553篇 |
1971年 | 521篇 |
1970年 | 501篇 |
1969年 | 538篇 |
1968年 | 650篇 |
1967年 | 545篇 |
1966年 | 552篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
21.
22.
Lewis E. Gilbert 《Knowledge, Technology, and Policy》1998,11(1-2):4-15
As the complexity of the challenges presented by our interactions with our planet continues to grow, we must develop new modes
of knowledge production. In these modes, distinctions between multidisciplinary and inter-disciplinary activities and processes
have renewed importance. There are at least two distinct types of interdisciplinary activities distinguished by the disciplinary
breadth they attempt to bridge. In the narrow case, reductionist processes reveal a common underlying principle or process
which can serve as a Rosetta stone. In the broad case, no such common arbiter exists. Investigators must develop integrating
vocabulary in the context of the full breadth of their work.
His primary activities are the fostering of university-wide interdisciplinary research and curriculum programs focused on
global change with the goal of developing Columbia into a world leader in issues related to global stewardship. 相似文献
23.
Relationship of anxiety and depression to age and sex in an acute psychiatric population 总被引:1,自引:0,他引:1
R E Correll 《Psychological reports》1984,55(3):979-986
24.
Convergent and divergent stereo mechanisms were compared in their ability to recover structure from motion. Contrary to a recent result reported by Richards and Lieberman, no difference in their performance was found; both mechanisms appeared equally capable of supporting the perception of good structure from motion. Possible reasons for the disparate results are discussed. 相似文献
25.
26.
The intuition that we have privileged and unrestricted access to ourselves – that we inevitably know who we are, how we feel, what we do, and what we think – is very compelling. Here, we review three types of evidence about the accuracy of self-perceptions of personality and conclude that the glass is neither full nor empty. First, studies comparing self-perceptions of personality to objective criteria suggest that self-perceptions are at least tethered to reality – people are not completely clueless about how they behave, but they are also far from perfect. Second, studies examining how well people’s self-perceptions agree with others’ perceptions of them suggest that people’s self-views are not completely out of synch with how they are seen by those who know them best, but they are also far from identical. Third, studies examining whether people know the impressions they make on others suggest that people do have some glimmer of insight into the fact that others see them differently than they see themselves but there is still a great deal people do not know about how others see them. The findings from all three approaches point to the conclusion that self-knowledge exists but leaves something to be desired. The status of people’s self-knowledge about their own personality has vast implications both for our conception of ourselves as rational agents and for the methods of psychological inquiry. 相似文献
27.
28.
Brain mapping studies using dynamic imaging methods demonstrate areas regional cerebral blood flow (rCBF) decreases, as well as areas where increases, during performance of various experimental tasks. Task holds for both sets of cerebral blood flow changes (CBF), providing the opportunity to investigate areas that become and “activated” in the experimental condition relative to control state. Such data yield the intriguing observation that in areas in emotional processing, such as the amygdala, the posteromedial cortex, and the ventral anterior cingulate cortex, although flow as expected during specific emotion-related tasks, flow decreases performance of some attentionally demanding, cognitive tasks. Conversely, in some of the areas that appear to subserve cognitive functions, as the dorsal anterior cingulate and the dorsolateral prefrontal cortices, increases while performing attentionally demanding cognitive tasks, but during some experimentally induced and pathological emotional Although the specific nature of such reciprocal patterns of regional remains unclear, they may reflect an important cross-modal interaction during mental operations. The possibility that neural activity is less in areas required in emotional processing during some higher cognitive processes holds implications for the mechanisms underlying interactions cognition and emotion. Furthermore, the possibility that neural in some cognitive-processing areas is suppressed during intense states suggests mechanisms by which extreme fear or severe may interfere with cognitive performance. 相似文献
29.
A. N. WILLIAMS 《Modern Theology》2004,20(4):505-526
The essay examines intellectual virtue in the Summa theologiae, taking it as an interpretative key to the epistemology of the Summa theologiae as a whole. Because Aquinas blurs the line between the acquired and the theological virtues, and between virtues and the gifts of the Spirit, it becomes impossible to maintain the distinction between the realms of nature and grace, or between natural reason and revealed truth: grace permeates the most ordinary activities of human reasoning. This reading of the Summa theologiae raises questions about many contemporary debates, particularly those concerning natural law. 相似文献
30.
A. G. Baker Hannah Steinwald Mark E. Bouton 《The Quarterly Journal of Experimental Psychology Section B: Comparative and Physiological Psychology》1991,43(2):199-218
In three experiments we studied the relationship between contextual conditioning and the reinstatement of extinguished lever pressing that occurs when noncontingent food is introduced following extinction. In all three experiments the non-contingent food was presented off-baseline (with the response levers not present). On subsequent tests, with the response levers present, animals that had been exposed to food showed more reinstatement of lever pressing than control animals. This finding rules out alternative mechanisms for the reinstated responding that rely on the interaction of non-contingent food and responding, such as superstitious reinforcement or the discriminative after-effects of food. In addition, in each experiment we demonstrated that manipulations known to affect contextual conditioning (signalling the food in Experiment 1, context extinction in Experiment 2, and switching contexts in Experiment 3) reduced the reinstatement. These results are consistent with the claim that contextual conditioning is important in controlling instrumental conditioning and closely parallel findings concerning the reinstatement of Pavlovian responsing following extinction. 相似文献