全文获取类型
收费全文 | 4630篇 |
免费 | 208篇 |
国内免费 | 1篇 |
出版年
2023年 | 29篇 |
2022年 | 25篇 |
2021年 | 53篇 |
2020年 | 78篇 |
2019年 | 94篇 |
2018年 | 134篇 |
2017年 | 150篇 |
2016年 | 181篇 |
2015年 | 110篇 |
2014年 | 141篇 |
2013年 | 570篇 |
2012年 | 256篇 |
2011年 | 245篇 |
2010年 | 175篇 |
2009年 | 137篇 |
2008年 | 212篇 |
2007年 | 215篇 |
2006年 | 182篇 |
2005年 | 152篇 |
2004年 | 161篇 |
2003年 | 142篇 |
2002年 | 112篇 |
2001年 | 93篇 |
2000年 | 81篇 |
1999年 | 54篇 |
1998年 | 54篇 |
1997年 | 60篇 |
1996年 | 55篇 |
1995年 | 59篇 |
1994年 | 41篇 |
1993年 | 52篇 |
1992年 | 56篇 |
1991年 | 38篇 |
1990年 | 51篇 |
1989年 | 36篇 |
1988年 | 46篇 |
1987年 | 34篇 |
1986年 | 17篇 |
1985年 | 30篇 |
1984年 | 31篇 |
1983年 | 24篇 |
1982年 | 43篇 |
1981年 | 23篇 |
1980年 | 20篇 |
1979年 | 27篇 |
1978年 | 27篇 |
1977年 | 21篇 |
1974年 | 23篇 |
1971年 | 16篇 |
1970年 | 16篇 |
排序方式: 共有4839条查询结果,搜索用时 15 毫秒
101.
Abstract— When two shapes that differ in orientation or size have to be compared or objects have to be recognized from different viewpoints, the response time and error rate art systematically affected by the size of the geometric difference. In this report, we argue that these effects are not necessarily solid evidence for the use of mental transformations and against the use of invariants by the visual system. We report an experiment in which observers were asked to give affine-invariant coordinates of a point located in an affine frame defined by three other points. The angle subtended by the coordinate axes and the ratio of the lengths of their unit vectors systematically affected the measurement errors. This finding demonstrates that the visual system's measurement of invariants need not itself be invariant. 相似文献
102.
103.
104.
105.
This report explores the relationship between philosophy and medicine in the Netherlands. In Section 1 we outline the ups and downs of medico-philosophical research in our country: pre-war flourishing, post-war decline, and modern renaissance. In Section 2 we review recent Dutch literature in the philosophy of medicine. The topics dealt with include methodology of medical science, alternative medicine, the basic concepts of medicine, anthropological medicine, medicalization, medicine and culture, and health care ethics. 相似文献
106.
107.
This paper describes a computational method for weighted euclidean distance scaling which combines aspects of an analytic solution with an approach using loss functions. We justify this new method by giving a simplified treatment of the algebraic properties of a transformed version of the weighted distance model. The new algorithm is much faster than INDSCAL yet less arbitrary than other analytic procedures. The procedure, which we call SUMSCAL (subjectivemetricscaling), gives essentially the same solutions as INDSCAL for two moderate-size data sets tested.Comments by J. Douglas Carroll and J. B. Kruskal have been very helpful in preparing this paper. 相似文献
108.
109.
A theoretical framework is proposed for understanding perceptual skills in their functional context. Pictorial perception is construed as a functionally specialised skill whose pervasive importance in modern education derives from the proliferation of pictorial materials in Western culture. Drawing on cross-cultural research, the major components of the skill are identified as (1) detection of appropriate contexts for its application, (2) selection of a limiting frame of reference, (3) use of conventional criteria of fidelity to recognise depicted items, (4) sensitivity to impoverished depth cues, (5) an expectation of finding in the picture most of the information necessary for its disambiguation, and (6) various assumptions about the range of cognitive inferences that may legitimately be made ‘beyond the information given’. Training studies are interpreted as suggesting that the skill can be enhanced through guided experience. 相似文献
110.