全文获取类型
收费全文 | 6481篇 |
免费 | 330篇 |
国内免费 | 4篇 |
出版年
2023年 | 66篇 |
2022年 | 102篇 |
2021年 | 122篇 |
2020年 | 169篇 |
2019年 | 170篇 |
2018年 | 345篇 |
2017年 | 329篇 |
2016年 | 279篇 |
2015年 | 173篇 |
2014年 | 197篇 |
2013年 | 848篇 |
2012年 | 451篇 |
2011年 | 473篇 |
2010年 | 302篇 |
2009年 | 203篇 |
2008年 | 366篇 |
2007年 | 314篇 |
2006年 | 265篇 |
2005年 | 257篇 |
2004年 | 159篇 |
2003年 | 159篇 |
2002年 | 150篇 |
2001年 | 75篇 |
2000年 | 91篇 |
1999年 | 66篇 |
1998年 | 31篇 |
1997年 | 32篇 |
1996年 | 33篇 |
1995年 | 25篇 |
1994年 | 23篇 |
1993年 | 22篇 |
1992年 | 36篇 |
1991年 | 28篇 |
1990年 | 31篇 |
1989年 | 32篇 |
1988年 | 30篇 |
1987年 | 19篇 |
1986年 | 16篇 |
1985年 | 23篇 |
1984年 | 20篇 |
1983年 | 22篇 |
1982年 | 14篇 |
1981年 | 16篇 |
1979年 | 20篇 |
1978年 | 14篇 |
1976年 | 17篇 |
1974年 | 16篇 |
1973年 | 12篇 |
1968年 | 13篇 |
1965年 | 13篇 |
排序方式: 共有6815条查询结果,搜索用时 0 毫秒
41.
42.
43.
Stig Fhanér 《Psychometrika》1966,31(2):267-269
It is shown that certain correlation measures suggested by information theory are simple functions of the determinants of the correlation matrices involved, if multivariate normality is assumed. This illuminates and in a sense strengthens Rozeboom's point in [3], that information theoretical statistics have classical correlational counterparts. 相似文献
44.
45.
Rodolphe Gasché 《Argumentation》1990,4(1):85-100
In the Critique of Judgement, Kant, despite his strong condemnation of rhetoric, introduces the figure of hypotyposis at the very moment he sets out to tackle the philosophical problem of presentation as such. This study holds that this choice of the rhetorical term is not fortuitous. Its connotations of vivid illustration, synopsis, and moral grandeur serve Kant in arguing that, on a transcendental level, presentation secures the mind's life, unity, and self-affection. Although of rhetorical origin, hypotyposis is thus shown to link up with a specifically philosophical meaning of the term in the writings of Aristotle. 相似文献
46.
G. A. Nesvetailov’s 《Knowledge, Technology, and Policy》1993,6(1):38-51
In this paper a method is outlined for measuring the diversity of the results of applied R&D with the use of IPC (International
Patent Classification). The method has been tested in the contexts of the academic physical, engineering, and chemical institutes.
The trend of applied research at a given institute increases both at the level of classes and subclasses, and at the IPC level.
Inventions developed within specializations at each institute have a greater efficiency than other forms of inventive activity.
The objective was to seek the optimal extent of diversification of applied R&D, which would simultaneously ensure the preservation
of the scientific specialization of an institute, the high level of scientific research associated with developing innovations,
and the high overall efficiency of each institute. 相似文献
47.
Marja Alestalo’s 《Knowledge, Technology, and Policy》1993,6(1):52-66
Finland has followed the Scandinavian model of the welfare state in which the level of state activism is high, the economic
pressures on the scientific activities are strong, and the left-wing parties and the Center Party have formulated the main
ideas. In the 1970s welfare ideology was adopted in science policy by emphasizing the promotion of socially relevant scientific
activities and the expansion of the university system as a means of effecting equal opportunity. Currently, the trend is toward
a mixed welfare economy. Programs have been prepared in spite of the radical cut in government expenditure, and without a
consideration of the long-term consequences. 相似文献
48.
Lindsay St. Claire 《Journal of community & applied social psychology》1993,3(3):183-195
Briefs about mentally retarded people are more negative than briefs about other social categories; professionals, such as medical doctors evaluate them most negatively of all. It was hypothesized (a) that medics' beliefs about mentally retarded people are mediated by psychological salience of their clinical social identification, rather than by personal characteristics that medics happen to share and (b) that such beliefs will bias decisions, rather than enhance accuracy. Forty-five doctors and medical students were randomly assigned to conditions designed to enhance salience of their shared clinical social identification or individual self-perceptions. Subjects completed semantic differentials about mentally retarded people and distinguished between slides of ‘mentally retarded’ and ‘normal’ children. Beliefs of subjects in the medical condition were significantly more negative than those in the personal condition. A signal detection analysis revealed no difference between conditions in subjects' ability to distinguish between children but showed that subjects in the medical condition were significantly more likely to judge a child ‘mentally retarded’ when in doubt. Results were discussed within an information processing framework and supported the idea that a salient clinical social identity can mediate beliefs that are likely to handicap patients. 相似文献
49.
When an observer views a moving scene binocularly, both motion parallax and binocular disparity provide depth information. In Experiments lA-1C, we measured sensitivity to surface curvature when these depth cues were available either individually or simultaneously. When the depth cues yielded comparable sensitivity to surface curvature, we found that curvature detection was easier with the cues present simultaneously, rather than individually. For 2 of the 6 subjects, this effect was stronger when the component of frontal translation of the surface was vertical, rather than horizontal. No such anisotropy was found for the 4 other subjects. If a moving object is observed binocularly, the patterns of optic flow are different on the left and right retinae. We have suggested elsewhere (Cornilleau-Pérès & Droulez, in press) that this motion disparity might be used as avisual cue for the perception of a 3-D structure. Our model consisted in deriving binocular disparity from the left and right distributions of vertical velocities, rather than from luminous intensities, as has been done in classical studies on stereoscopic vision. The model led to some predictions concerning the detection of surface curvature from motion disparity in the presence or absence of intensity-based disparity (classically termedbinocular disparity). In a second set of experiments, we attempted to test these predictions, and we failed to validate our theoretical scheme from a physiological point of view. 相似文献
50.
Two visual half-field experiments tested Moscovitch’s (1979) proposition that cerebral asymmetry does not concern the earliest perceptual stages but only later processing. Subjects were briefly shown displays that included one (Experiment 1) or two (Experiment 2) types of forms differing in size and which, according to previous evidence, might lead to opposite laterality effects. Laterality effects were assessed for correct detections and for illusory conjunctions, both in terms of raw detection scores and in terms of perceptual discriminability (dr scores). In Experiment 1, displays included either rectangles or triangles. In the first case, the target was a cross; in the second case, it was a Star of David. A hemifield x size interaction was observed both on correct detections and on associated discriminability. Yet, no such interaction was obtained for illusory conjunctions or for associated d’ scores. In Experiment 2, the two types of forms were presented simultaneously, with the small ones either inside or outside the large ones. No laterality effects were observed. Some implications of these data for both hemispheric asymmetry and feature integration issues are discussed. The results suggest that early preattentive processes of feature extraction are not lateralized, whereas some integrative mechanisms, such as Treisman’s (1988) focal attention, may operate differently in the two hemispheres. 相似文献