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   26222篇
  免费   442篇
  国内免费   36篇
教育   19150篇
科学研究   2177篇
各国文化   278篇
体育   1948篇
综合类   35篇
文化理论   243篇
信息传播   2869篇
  2021年   251篇
  2020年   404篇
  2019年   568篇
  2018年   783篇
  2017年   879篇
  2016年   798篇
  2015年   506篇
  2014年   661篇
  2013年   5174篇
  2012年   622篇
  2011年   713篇
  2010年   547篇
  2009年   542篇
  2008年   613篇
  2007年   584篇
  2006年   531篇
  2005年   467篇
  2004年   440篇
  2003年   413篇
  2002年   448篇
  2001年   485篇
  2000年   460篇
  1999年   459篇
  1998年   262篇
  1997年   285篇
  1996年   309篇
  1995年   269篇
  1994年   256篇
  1993年   241篇
  1992年   344篇
  1991年   351篇
  1990年   374篇
  1989年   359篇
  1988年   330篇
  1987年   286篇
  1986年   297篇
  1985年   371篇
  1984年   296篇
  1983年   282篇
  1982年   231篇
  1981年   245篇
  1980年   205篇
  1979年   299篇
  1978年   239篇
  1977年   237篇
  1976年   190篇
  1975年   156篇
  1974年   154篇
  1973年   169篇
  1972年   139篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
52.
Ordinary markets allow parties, not the state, to value property and projects. But they do not account for subjective value in such traditional contexts as condemnation. An awareness of these nonmarket values helps overcome any categorical opposition to the use of the contingent valuation method (CVM) to value cultural and environmental resources. But accurate CVM should measure all values, positive or negative, tononowners; it should apply generally to any substitute projects; and it should seek to account for diminishing marginal value of additional resource units. CVM should be used only to aggregate nonmarket preferences, not to skew the political debate to cultural or environmental objectives.  相似文献   
53.
The purpose of this study was to determine test-retest reliability for the 1-mile, 3/4-mile, and 1/2-mile distance run/alk tests for children in Grades K-4. Fifty-one intact physical education classes were randomly assigned to one of the three distance run conditions. A total of 1,229 (621 boys, 608 girls) completed the test-retests in the fall (October), with 1,050 of these students (543 boys, 507 girls) repeating the tests in the spring (May). Results indicated that the 1-mile run/walk distance, as recommended for young children in most national test batteries, has acceptable intraclass reliability (.83 less than R less than .90) for both boys and girls in Grades 3 and 4, has minimal (fall) to acceptable (spring) reliability for Grade 2 students (.70 less than R less than .83), but is not reliable for children in Grades K and 1 (.34 less than R less than .56). The 1/2 mile was the only distance meeting minimal reliability standards for boys and girls in Grades K and 1 (.73 less than R less than .82). Results also indicated that reliability estimates remained fairly stable across gender and age groups from the fall to spring testing periods, with the exception of the noticeably improved values for Grade 2 students on the 1-mile run/walk test. Criterion-referenced reliability (P, percent agreement) was also estimated relative to Physical Best and Fitnessgram run/walk standards. Reliability coefficients for all age group standards were acceptable to high (.70 less than P less than .95), except for Fitnessgram standards for 5-year-old girls on the 1-mile test for both fall and spring and for 6-year-old boys and girls on the 1-mile test administered in the spring.  相似文献   
54.
55.
This study was designed to examine the magnitude and duration of excess postexercise oxygen consumption (EPOC) following upper body exercise, using lower body exercise for comparison. On separate days and in a counterbalanced order, eight subjects (four male and four female) performed a 20-min exercise at 60% of mode-specific peak oxygen uptake (VO2) using an arm crank and cycle ergometer. Prior to each exercise, baseline VO2 and heart rate (HR) were measured during the final 15 min of a 45-min seated rest. VO2 and HR were measured continuously during the postexercise period until baseline VO2 was reestablished. No significant difference between the two experimental conditions was found for magnitude of EPOC (t [7] = 0.69, p greater than .05). Mean (+/- SD) values were 9.2 +/- 3.3 and 10.4 +/- 5.8 kcal for the arm crank and cycle ergometer exercises, respectively. Duration of EPOC was relatively short and not significantly different (t [7] = 0.24, p greater than .05) between the upper body (22.9 +/- 13.7 min) and lower body (24.2 +/- 19.4 min) exercises. Within the framework of the chosen exercise conditions, these results suggest EPOC may be related primarily to the relative metabolic rate of the active musculature, as opposed to the absolute exercise VO2 or quantity of active muscle mass associated with these two types of exercise.  相似文献   
56.
57.
58.
The number of books and journals published about philanthropy is growing. This article examines that growth, looks at which book and journal publishers are most active in the field, and explores the publishing environment. Philanthropy's interdisciplinary nature raises questions about audience and markets, as well as authors and publishers.  相似文献   
59.
Peer Observation of Teaching (POT) is a little used way of stimulating reflection on and improvement of teaching. It is an unusual form of staff development [SD] that emphasises continuous processes and peer feedback rather than course attendance. This paper describes the principles and practice of POT, including potential benefits and drawbacks and discusses the conditions necessary for it to flourish in departments and institutions. It argues that POT overcomes the problem of staff ownership'of SD by connecting with peer culture but may be promoted, implemented and supported by SD functions linked to personnel departments. Thus SD functions may play a more substantial role in their organisations'development than hitherto.  相似文献   
60.
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