首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   33916篇
  免费   1369篇
  国内免费   8篇
  2019年   448篇
  2018年   584篇
  2017年   612篇
  2016年   619篇
  2015年   434篇
  2014年   555篇
  2013年   2514篇
  2012年   1011篇
  2011年   1109篇
  2010年   635篇
  2009年   632篇
  2008年   937篇
  2007年   923篇
  2006年   861篇
  2005年   780篇
  2004年   781篇
  2003年   689篇
  2002年   719篇
  2001年   1044篇
  2000年   949篇
  1999年   726篇
  1998年   403篇
  1997年   324篇
  1996年   319篇
  1992年   567篇
  1991年   553篇
  1990年   542篇
  1989年   551篇
  1988年   548篇
  1987年   505篇
  1986年   531篇
  1985年   583篇
  1984年   464篇
  1983年   449篇
  1982年   364篇
  1981年   347篇
  1979年   539篇
  1978年   389篇
  1977年   323篇
  1976年   369篇
  1975年   440篇
  1974年   500篇
  1973年   517篇
  1972年   408篇
  1971年   384篇
  1970年   383篇
  1969年   411篇
  1968年   492篇
  1967年   433篇
  1966年   428篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
Suicides among older adults in the United States and Canada in the last decade have accounted for an increasing share of all suicides. In both countries the use of firearms among older adults has steadily increased. Despite these trends, little is known about the extent to which crisis centers are prepared to prevent elder suicide. A survey of AAS-listed crisis prevention centers examined the training, knowledge, and current practices relevant to elder suicide among personnel in 321 crisis prevention centers in both countries. Results revealed insufficient training, a lack of familiarity with recent suicide trends, and limited outreach to older adults.  相似文献   
42.
The country‐of‐origin effect is a topic central to the field of international marketing. Country of origin has been found to exert a particularly potent effect on consumer evaluation in situations where there is a strong link between a country and a particular product category. The present study provides further insight into how this particular effect can be understood. Drawing on a novel conceptualization of how country image and product categories interact, this study tested the relative evaluative relevance of product category with respect to estimates of brand equity across a variety of product categories. The findings suggest that facets of a country's image that are more closely related to the evaluation situation exert a greater influence on the evaluation of brands. This result encourages scholars as well as practitioners to re‐evaluate which situations might cause the country of origin effect to hold managerial relevance and paves the way for new paths toward a more comprehensive understanding of the effect. Copyright © 2015 John Wiley & Sons, Ltd.  相似文献   
43.
44.
45.
46.
A series of stereograms are presented which demonstrate that texture boundaries can strongly influence the perception of discontinuities between neighbouring three-dimensional (3-D) surfaces portrayed by means of stereo cues. In these demonstration figures, no stereo information is available in the immediate vicinity of the boundary between the two 3-D stereo surfaces because all texture in that region is removed in one eye's view. On the other hand, various forms of texture boundary information are provided in the resulting monocular region. This stimulus paradigm is used to explore the question: what influence does texture boundary information have on the nature of the perceived 3-D surface that is interpolated between two stimulus regions which carry stereo cues? It is shown that if a clear-cut texture boundary is present in the monocular region then this is used by the human visual system to fix the perceived location of 3-D crease and step surface discontinuities between the stereo regions. Collett (1985) explored this issue with a similar methodology and reported weak and unreliable assistance from monocular texture boundaries in helping shape 3-D stereo surface discontinuities. The strong and robust phenomena demonstrated here seem to rely on two main differences between the present stimuli and those of Collett. In the present stimuli, figurally continuous textures containing strong texture boundaries are used, together with a technique for minimising the complications, including binocular rivalry, that arise from the borders of the stimulus regions present in only one half of each stereogram.  相似文献   
47.
48.
49.
50.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号