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   817篇
  免费   11篇
教育   688篇
科学研究   18篇
各国文化   10篇
体育   36篇
综合类   1篇
文化理论   2篇
信息传播   73篇
  2023年   5篇
  2022年   7篇
  2021年   9篇
  2020年   12篇
  2019年   28篇
  2018年   29篇
  2017年   30篇
  2016年   35篇
  2015年   23篇
  2014年   34篇
  2013年   199篇
  2012年   18篇
  2011年   21篇
  2010年   19篇
  2009年   19篇
  2008年   21篇
  2007年   28篇
  2006年   24篇
  2005年   19篇
  2004年   20篇
  2003年   15篇
  2002年   18篇
  2001年   21篇
  2000年   21篇
  1999年   14篇
  1998年   13篇
  1997年   25篇
  1996年   5篇
  1995年   10篇
  1994年   9篇
  1993年   10篇
  1992年   5篇
  1991年   4篇
  1990年   9篇
  1989年   10篇
  1988年   2篇
  1987年   7篇
  1986年   7篇
  1985年   5篇
  1984年   6篇
  1983年   2篇
  1982年   3篇
  1981年   1篇
  1980年   1篇
  1979年   2篇
  1978年   1篇
  1975年   1篇
  1974年   1篇
排序方式: 共有828条查询结果,搜索用时 24 毫秒
111.
112.
The impact of family background on academic achievement, educational trajectories and life chances more generally has been a point of interest among academics for many years. The issue has been researched both quantitatively and qualitatively, with the two traditions generating quite different pictures of family-level ‘variables’ and processes related to child outcomes and boarder inequalities in education. This paper presents evidence of how parenting aspirations, strategies and practices vary according to social class gradients and work together in a holistic way to (re)produce social advantage and disadvantage during the primary school years.  相似文献   
113.
114.
Abstract

Previous research indicates that young athletes as well as athletic administrators hold gender-role stereotypical beliefs about coaches that disfavor females. The validity of two such beliefs (lack of qualified female coaches and time constraints due to family responsibilities) was examined in a statewide survey of 256 female and 296 male interscholastic coaches and a nationwide survey of 2,719 male and 1,449 female interscholastic coaches. Statistical analyses (p < .001) indicated that female coaches were (a) more qualified than their male counterparts with respect to coaching experience with female teams, professional training, and professional experience; (b) as qualified as male coaches with regard to intercollegiate playing experience; and (c) less qualified than male coaches with respect to high school playing experience and coaching experience with male teams. Findings also indicated that male rather than female coaches more often experienced time constraints due to family responsibilities.  相似文献   
115.
Abstract

Our purpose was to determine the aerobic capacities (VO2max) of a group of black female adolescents (age = 11.4 ? 15.8 years) randomly chosen from a single urban school. Of 91 girls selected, 64 performed an incremental treadmill running test to volitional exhaustion and achieved VO2max as determined from expired gas measures. Other measures included height (m), weight (kg), and calf and triceps skinfolds (for % fat estimates). Girls were also asked whether they had achieved menarche. VO2max averaged 37.3 ± 6.2 ml·kg?1 ·min?1 and was significantly correlated (r[62]) with height (?.32, p < .01), body mass index (?.63, p < .001), and % fat (?.65, p < .001) but not with age (?.16, p > .10). Postmenarchal girls were significantly taller and older than premenarchal girls. Contrary to previous studies, the girls' VO2max values were not related to biological age. Our subjects' aerobic capacity values averaged 14% less than those of nonblack U.S. female adolescents previously reported in the literature. This difference in VO2max was primarily a function of body weight. Study implications support the possibility that overweight in adult black women may originate prior to or during early adolescence. Future longitudinal studies should be designed to investigate the effects of aerobic fitness on cardiovascular risk factor reduction in black adolescent girls.  相似文献   
116.
Abstract

This study contrasted prepractice modeling with either the perceptual component (perceptual modeling) or the motor component (movement pattern) of a coincident-timing task to determine whether experiencing the modalities singly or in combination enhanced timing performance on initiation of active practice. The motor component was a 60-cm right-to-left arm movement coincident with the illumination of lights on a Bassin timer runway to displace a barrier as the final runway light was illuminated. Four groups were compared (n = 12 per group). A perceptual modeling group passively viewed stimulus runway lights prior to attempting the task. A motoric modeling group viewed a videotape prior to practice of a model performing the motor component of the skill with zero timing error. A perceptual modeling plus motoric modeling group experienced both modeling modalities prior to performance. Finally, a no modeling group simply initiated practice on the task without modeling. Results indicated that the groups experiencing perceptual modeling initiated practice with significantly less average timing error and variability. Thus, perceptual modeling appeared to be at least as important as motoric modeling as a source of prepractice information to make available to a learner to optimize coincident-timing skill acquisition.  相似文献   
117.
Abstract

The purpose of this study was to investigate differences between the oversized racquet and the standard-sized racquet in (1) a tennis shot accuracy test on four basic strokes (ground strokes, volley, return of serve, and serve), and (2) a measure of players' subjective evaluation of playability (control, accuracy, power, and feel). Research participants (n = 57) were undergraduate students separated into two skill levels, intermediate (n = 29) and beginners (n = 28). Data were analyzed using a two-factor ANOVA with repeated measures on one factor. Result from the skills tests indicated that both beginning and intermediate groups scores significantly higher when using the oversized racquet. The scores received when using the oversized racquet tended to reflect a general increase in all four components of the skill test, particularly the return of serve. Data indicated that the subjective evaluation of the playing characteristic of each racquet was influenced by the player's skill level. Beginning players favored the oversized racquet, yet intermediate players rated the two racquet types about equal. The investigation suggests that beginning and intermediate tennis players, educators, and tennis teaching professionals should consider using and encouraging the use of oversized racquets.  相似文献   
118.
This paper examines how the relationship between firm value and patent-based indicators of inventive activity has changed over time. We use data from more than 33,000 mergers and acquisitions deals between 1985 and 2007, and distinguish between American (USPTO) and European (EPO) patents. Our results indicate that over time EPO patents have become the dominant indicator of innovative activity, while USPTO patents have no effect on firm value near the end of the sample period. The results are robust to controlling for citations and are especially strong for small firms, for firms operating in the drug and chemical industries, and when target and acquiring firms operate in different industries or countries.  相似文献   
119.
ABSTRACT

Class-related parenting cultures and ideologies have been of considerable interest to academics over the last two decades. Much of the research thus far has focused on exploring Annette Lareau's conceptualisations of ‘natural growth’ and ‘concerted cultivation’ and the implications for outcomes in relation to education. The focus of the present article is organised activities, which are a central but as yet relatively under-researched feature of middle-class parenting. The findings are based upon 73 semi-structured interviews with parents and children from 48 middle-class families living in and around a small city in northern England. The article reveals that initiating and facilitating children's organised activities is considered a central aspect of ‘good’ parenting in middle-class social networks. It is shown how this is a consequence of several developments within society over the past three decades or so, including the rising levels of maternal employment, the growing competitiveness of the labour market and the increasing concerns related to children's health and safety. It is argued that these developments have heightened middle-class parents’ predisposition to not only be involved with and invest in their children's leisure biographies, but to do so in a more deliberate, rigorous and rational manner.  相似文献   
120.
Children in child-centered preschools and kindergartens were compared to children in didactic, highly academic programs in terms of their basic skills achievement and a set of motivation variables. The study included 227 poor, minority, and middle-class children between the ages of 4 and 6 years. Children in didactic programs that stressed basic skills had significantly higher scores on a letters/reading achievement test but not on a numbers achievement test. Being enrolled in a didactic early childhood education program was associated with relatively negative outcomes on most of the motivation measures. Compared to children in child-centered programs, children in didactic programs rated their abilities significantly lower, had lower expectations for success on academic tasks, showed more dependency on adults for permission and approval, evidenced less pride in their accomplishments, and claimed to worry more about school. Program effects were the same for economically disadvantaged and middle-class children, and for preschoolers and kindergartners.  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