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   54461篇
  免费   1351篇
  国内免费   20篇
  2020年   342篇
  2019年   472篇
  2018年   3976篇
  2017年   3346篇
  2016年   2817篇
  2015年   664篇
  2014年   632篇
  2013年   2917篇
  2012年   1495篇
  2011年   3362篇
  2010年   3105篇
  2009年   2115篇
  2008年   2608篇
  2007年   3021篇
  2006年   868篇
  2005年   957篇
  2004年   838篇
  2003年   827篇
  2002年   717篇
  2001年   1256篇
  2000年   1258篇
  1999年   892篇
  1998年   440篇
  1997年   352篇
  1996年   341篇
  1994年   343篇
  1992年   762篇
  1991年   713篇
  1990年   700篇
  1989年   646篇
  1988年   615篇
  1987年   610篇
  1986年   585篇
  1985年   640篇
  1984年   524篇
  1983年   409篇
  1979年   498篇
  1978年   385篇
  1977年   377篇
  1976年   349篇
  1975年   461篇
  1974年   461篇
  1973年   527篇
  1972年   419篇
  1971年   351篇
  1970年   343篇
  1969年   355篇
  1968年   418篇
  1967年   357篇
  1966年   404篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
931.
The “disjuncture” between level of aspiration and means of accomplishing it can create serious difficulty for the person. The function of the 2-year college in helping the student to resolve this conflict has been described as a “cooling-out” process. Essentially, it involves a running evaluation of the student's capacities, and guidance in helping him to find the educational and vocational program for which he is best suited. Several ways of facilitating this process are presented. There is need for an integrated guidance program pervading the entire institution as well as the student's career at the institution.  相似文献   
932.
This paper examines the possibility of a closer relationship between the school counselor, the school psychologist, and the school social worker. It describes the background of each of the trio, then describes the various functions and the professional education of counselors, psychologists, and social workers. The various steps that might be taken to inaugurate an “ecumenical movement” between the three professional groups are then discussed. School counselors are described as being the logical individuals to take the initial steps in such a proposed movement, and the new functional title suggested for each of the three is “school counseling psychologist.”  相似文献   
933.
934.
Redundancy as a variable in pattern perception   总被引:1,自引:0,他引:1  
  相似文献   
935.
936.
937.
Judgments were made of the size of a small, luminous (inner) square appearing in the center of a somewhat larger, variable (outer) square, the whole pattern appearing in the dark. Accuracy of judgment was greatest when the outer square was constant from trial to trial but deteriorated when the outer square also varied in size, reaching a lower limit less than the accuracy produced under the absolute judgment condition (no outer square presented). An application of multiple discriminant analysis and the use of a maximum likelihood observer model provided estimates of the extent to which Os responded to inner and outer size variation as separate aspects of stimulation. Although Os differed markedly in this respect, their ability to identify inner square size under the various conditions did not reflect this difference.  相似文献   
938.
In both vision and hearing, a masking or inhibiting stimulus increases the slope (exponent) of the power function that relates sensation to stimulus. The power transformation applies only to the inhibited part of the function where the signal is fainter than the masking noise. Where the signal equals the noise, the function shows a discontinuous knee. Experiments were undertaken to see whether the loudness of a tone of 1000 Hz in a white noise would follow a model based on a constant signal-to-noise ratio at two locations, at the effective threshold and at the knee where the inhibited function meets the uninhibited function. The data accord with the slopes (exponents) generated by the model. The same model gives a fairly good account of the recruitment functions for ears suffering from cochlear involvement (e.g., Méniere’s disease). Regardless of degree of hearing loss, loudness recruitment reaches normal when the tone (1000 Hz) is about 30 dB above the affected threshold.  相似文献   
939.
The Pulfrich pendulum was evaluated as a potential screening device for the detection of anomalies of binocular vision. For this purpose, a booth was set up at the Kentucky State Fair (1964) and the general public invited to observe the pendulum and record their responses with the equipment provided. The obtained results indicate that a dichotomy can be achieved between those who have binocular vision and those who do not. However, gradations of binocular vision from poor to good cannot be achieved with the pendulum as presently understood. Contrary to explanatory theory the characteristic shape of the seen pendulum path was asymmetrical following the rule that the path was displaced away from the observer on the side of the filtered eye.  相似文献   
940.
The interval between exploratory trials was varied in experiments using simple elevated or enclosed mazes. Activity on the second trial was depressed for short intertrial intervals but had recovered after about 10 min.; the degree of recovery was different in the two types of maze. A second decrease in second trial activity was found with inter-trial intervals of more than 20 min., but a further experiment suggested this was due to the effects of delay itself, rather than to previous experience of the environment.  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