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   124583篇
  免费   1632篇
  国内免费   239篇
教育   86561篇
科学研究   13579篇
各国文化   2037篇
体育   9538篇
综合类   175篇
文化理论   1141篇
信息传播   13423篇
  2021年   965篇
  2020年   1715篇
  2019年   2625篇
  2018年   3139篇
  2017年   3440篇
  2016年   3477篇
  2015年   2373篇
  2014年   3244篇
  2013年   27742篇
  2012年   2420篇
  2011年   2766篇
  2010年   2379篇
  2009年   2656篇
  2008年   2449篇
  2007年   2171篇
  2006年   2394篇
  2005年   2373篇
  2004年   3059篇
  2003年   2389篇
  2002年   2189篇
  2001年   2048篇
  2000年   1735篇
  1999年   1562篇
  1998年   1478篇
  1997年   1554篇
  1996年   1730篇
  1995年   1493篇
  1994年   1490篇
  1993年   1491篇
  1992年   1507篇
  1991年   1406篇
  1990年   1407篇
  1989年   1334篇
  1988年   1188篇
  1987年   1121篇
  1986年   1137篇
  1985年   1422篇
  1984年   1296篇
  1983年   1288篇
  1982年   1265篇
  1981年   1183篇
  1980年   1170篇
  1979年   1231篇
  1978年   1215篇
  1977年   1111篇
  1976年   1011篇
  1975年   807篇
  1974年   804篇
  1973年   771篇
  1971年   627篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
Self-concept development and educational degree attainment   总被引:1,自引:0,他引:1  
The present study explores changes in the academic, social, and artistic self-concept of college students over a nine-year period. While the findings demonstrate a positive relationship between the educational degree attainment levels of students and their formation of a more healthy self-concept, the findings further indicate that the relationship is not consistent for males and females. In general, the findings suggest that the collegiate experience does not diminish self-concept gender differences that exist at the time of matriculation. The degree to which changes in students' self-concept is related to selected aspects of their collegiate experience and characteristics of their undergraduate institutions is also explored. The findings indicate that changes in students' self-concept is related to their level of social and academic integration during their undergraduate careers and to the size and selectivity of colleges they attend. The implications of these findings for enhancing students' self-concept during the college years are discussed.  相似文献   
992.
While much criticism has been leveled at graduate education in major United States colleges and universities in the recent past, this study investigated the style and format variables related to preparation of the dissertation and associated matters. The results of this study indicate that a significant amount of introspective evaluation of the dissertation process and product has taken place over the last five years. Technological advances, quality concerns, and increased student involvement in the preparation process have been recognized and incorporated into new dissertation requirements, and a trend toward decentralized monitoring of dissertation preparation is evident from the results. Also presented are comparative information and data contrasting current practices with those reported in a 1975–76 survey of the same population. In both cases the response rate for the survey was greater than 85%, thus providing a very definitive picture of the current status of dissertation preparation.  相似文献   
993.
994.
The example of teachers not seeking counselling was used. Some reasons for this situation were given as well as one possible way to change it by providing early information and training during the students' regular studies. My hope is that if teachers have the necessary information, abilities and positive experiences, when they have problems, it should be easier for them to use counsellors than it is for other today.Teachers were used as an example of how one group could be encounraged to make use of counsellors. However, similar strategies could be used with other groups whose jobs involve high personal stress (for example social workers, medical doctors etc.). The example of teachers was also used to show how change can be introduced within a system. Here it might be useful to develop the ability to work with a counsellor during the regular education, so that it becomes part of their understanding of their professional role.  相似文献   
995.
996.
There is increasing interest in the role of social support in determining risk for child abuse and neglect. The present study assessed the relationship between maternal social support and two areas: stress in the mother-child relationship: and level of stimulation provided in the home. Maternal social support was assessed prenatally and at a two-year follow-up, while the latter variables were compiled at the two-year follow-up. The data were obtained from 38 urban, low SES (80% on public assistance) mothers and their 2-year-old children. Maternal social support correlated positively with level of stimulation and negatively with level of mother-child stress, and was the best predictor of both, relative to any SES, mother or child variables. In addition, high stress, low support mothers provided significantly less stimulation to their children. The theoretical implications for social support as a mediator variable as well as its implications for early identification and prevention efforts in abuse and neglect are discussed.  相似文献   
997.
Linear conversions were developed relating scores on two recent forms of the homogeneous GRE Quantitative Test (GRE-Q) and the specially constituted heterogeneous GRE Verbal-plus-Quantitative Test (GRE-V+Q), using randomly equivalent groups of about 13, 000 taking each form. Specially defined homogeneous subpopulations were then identified, and conversions between scores on the two forms were again calculated, this time based on l000-case samples drawn at random from the subpopulations. Finally, in order to develop empirical measures of equating error, I00 samples of 1, 000 cases each were drawn at random from the two total groups and used to calculate 100 conversions between scores on the two forms. The conversions based on the specially selected subpopulations were then compared with the total-group conversions and evaluated in terms of the empirical standard errors. The results showed that the conversions for the subpopulations agreed with the total-group conversion quite satisfactorily for the GRE-Q and almost as well for the GRE-V+Q. It was concluded that the data clearly support the assumption of population independence for homogeneous tests, but not quite so clearly for heterogeneous tests.  相似文献   
998.
999.
Signaled avoidance was studied in individual honeybees that visited the laboratory regularly to take sucrose solution from a target set on the sill of an open window. During feeding, substrate vibration or airstream was used to signal a brief shock that could be avoided by breaking off contact with the food for a few seconds. Aversive conditioning of the context was measured in terms of return time (the time between successive visits). In Experiment 1, experience with unsignaled shock was found to lengthen return time—which experience with signaled shock did not—and to impair performance in subsequent avoidance training with signaled shock (the US-preexposure effect). In Experiment 2, experience with unsignaled shock given after signaled avoidance training lengthened return time but had no effect on response to the signal in a subsequent extinction test. These results closely resemble the results obtained in analogous experiments with vertebrates.  相似文献   
1000.
To be successful, an instructional video presentation needs to be effective, valued, liked and efficient, and educationalists and designers should strive (explicitly and implicitly) to satisfy these criteria. In the interests of optimum teaching effect, a didactical distinction is recommended between video presentations that have to ‘instruct’, ‘explain’, ‘tell’ and ‘let encounter’. A schema or frame of reference is proposed, the use of which (it is claimed) can help to optimise communication between video producer, teacher and instructional designer  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