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   25310篇
  免费   932篇
  国内免费   10篇
  2018年   345篇
  2017年   371篇
  2016年   383篇
  2015年   271篇
  2014年   351篇
  2013年   1838篇
  2012年   602篇
  2011年   653篇
  2010年   437篇
  2009年   408篇
  2008年   638篇
  2007年   571篇
  2006年   550篇
  2005年   474篇
  2004年   470篇
  2003年   479篇
  2002年   494篇
  2001年   651篇
  2000年   654篇
  1999年   517篇
  1998年   260篇
  1997年   282篇
  1996年   283篇
  1995年   259篇
  1992年   501篇
  1991年   456篇
  1990年   458篇
  1989年   422篇
  1988年   437篇
  1987年   416篇
  1986年   456篇
  1985年   436篇
  1984年   379篇
  1983年   341篇
  1982年   256篇
  1981年   269篇
  1979年   404篇
  1978年   325篇
  1977年   284篇
  1976年   298篇
  1975年   348篇
  1974年   437篇
  1973年   471篇
  1972年   351篇
  1971年   374篇
  1970年   340篇
  1969年   366篇
  1968年   435篇
  1967年   403篇
  1966年   418篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
901.
Guidance and counseling in the schools lack focus and direction. Some attribute this confusion within guidance and counseling to a lack of a philosophical foundation. Little is known about the philosophical assumptions of counselors functioning in secondary schools. In this study, the counselors in the secondary schools of Iowa identified most frequently with the phenomenological orientation. The experience of the counselors was related to their philosophical orientation. Counselors with less experience subscribed to an existential orientation.  相似文献   
902.
An adult, with a puppet held at shoulder height on either side (within the infant's visual field), interacted with 3- to-6-month-olds, turning her head intermittently to talk to a puppet. Seventy- three percent of infants' first eye-turns were in the direction of the adult head-turn.  相似文献   
903.
Dienes and Berry (1997) argue that there really are two kinds of knowledge, implicit and explicit, that can be characterized through a subjective threshold. We argue that the subjective threshold does not separate two forms of knowledge, but instead two uses of knowledge, for two different purposes. With Neal and Hesketh (1997), we suggest that an understanding of learning will be better served by investigating the processing that occurs under various circumstances than by attempting to isolate learning that occurs with awareness from that which occurs without it.  相似文献   
904.
This study investigated the personality and family-of-origin differences in male and female alcoholics. Results indicated that, regarding personality, men (both type 1 and type 2) were less troubled than were women. Implications for treatment based on these results are included.  相似文献   
905.
906.
Compositional semantics for a language of imperfect information   总被引:3,自引:0,他引:3  
  相似文献   
907.
Because the World-Wide Web has features that are not found in traditional information systems, it has some unique problems pertaining to human use, such as the difficulty of searching for specific information. This paper describes human cognitive limitations pertinent to the design of Web browsers and provides a conceptual model for human information processing on the Web. It also compares user strategies and use of browser functions for two tasks that differ in the specificity of the information that is to be retrieved. General principles and specific recommendations for the design of Web browsers are derived from these considerations.  相似文献   
908.
Homographs and homophones have interesting linguistic properties that make them useful in many experiments involving language. To assist researchers in the elicitation of homophones, this paper presents a set of 93 line-drawn pictures of objects with homophonic names and a set of 108 questions with homophonic answers. Statistics are also included for each picture and question: Picture statistics include name-agreement percentages, dominance, and frequency statistics of depicted referents, and picture-naming latencies both with and without study of the picture names. For questions, statistics include answer-agreement percentages, difficulty ratings, dominance, frequency statistics, and naming latencies for 60 of the most consistently answered questions.  相似文献   
909.
Nonparametric regression techniques, which estimate functions directly from noisy data rather than relying on specific parametric models, now play a central role in statistical analysis. We can improve the efficiency and other aspects of a nonparametric curve estimate by using prior knowledge about general features of the curve in the smoothing process. Spline smoothing is extended in this paper to express this prior knowledge in the form of a linear differential operator that annihilates a specified parametric model for the data. Roughness in the fitted function is defined in terms of the integrated square of this operator applied to the fitted function. A fastO(n) algorithm is outlined for this smart smoothing process. Illustrations are provided of where this technique proves useful.  相似文献   
910.
The integration of binocular stereopsis and kinetic depth was measured for two distinct aspects of 3-Dstructure: (1)shape index, which is a measure of scale-independent structure, and (2)curvedness, which is a measure of scale-dependent structure. We found that motion contributes significantly more to judged shape index than it does to judged curvedness, and stereo contributes significantly more to judged curvedness than it does to judged shape index. This suggests that the differences in the relative contribution of motion and stereo reported here occurred because these two sources do not equally specify the scale-dependent and scale-independent aspects of surface structure. Furthermore, these results seem to be inconsistent with integration models in which the different visual cues all initially contribute to the same single representation of 3-Dstructure.  相似文献   
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