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   2422篇
  免费   64篇
  国内免费   4篇
教育   1809篇
科学研究   118篇
各国文化   60篇
体育   246篇
综合类   1篇
文化理论   28篇
信息传播   228篇
  2022年   16篇
  2021年   20篇
  2020年   43篇
  2019年   62篇
  2018年   96篇
  2017年   103篇
  2016年   93篇
  2015年   61篇
  2014年   87篇
  2013年   531篇
  2012年   78篇
  2011年   74篇
  2010年   59篇
  2009年   69篇
  2008年   86篇
  2007年   63篇
  2006年   69篇
  2005年   61篇
  2004年   46篇
  2003年   62篇
  2002年   64篇
  2001年   43篇
  2000年   31篇
  1999年   35篇
  1998年   22篇
  1997年   36篇
  1996年   35篇
  1995年   35篇
  1994年   19篇
  1993年   21篇
  1992年   22篇
  1991年   31篇
  1990年   20篇
  1989年   25篇
  1988年   16篇
  1987年   13篇
  1986年   24篇
  1985年   16篇
  1984年   15篇
  1983年   19篇
  1982年   25篇
  1981年   18篇
  1980年   8篇
  1979年   23篇
  1978年   9篇
  1977年   14篇
  1976年   12篇
  1974年   7篇
  1972年   6篇
  1967年   5篇
排序方式: 共有2490条查询结果,搜索用时 31 毫秒
991.
This study explores the factors influencing the dissent behavior and perceptions of workplace freedom of speech among young Chinese professionals who are intra-urban migrants. It attempts to grasp the role of the Chinese household registration system, referred to as Hukou, in migrants’ professional and everyday life. Fourteen interviews were conducted with young, well-educated intra-urban migrants who possessed middle-income jobs but did not possess a Shanghai registration (Hukou). This study reveals that traditional Confucian values are significant in shaping Chinese migrant workers’ expressions of dissent and perceptions of workplace freedom of speech. Findings from this study demonstrate that further attention to professional migrants is warranted to understand their unique position in Chinese society. Internal migration is a global phenomenon particularly prominent in developing countries. This study is an attempt to shed light on internal migrant’s social and organizational life in developing economies.  相似文献   
992.
ABSTRACT

The purpose of this study was to determine the influence of different wheel size diameters on indicators of cross-country mountain bike time trial performance. Nine competitive male mountain bikers (age 34.7 ± 10.7 years; stature 177.7 ± 5.6 cm; body mass 73.2 ± 8.6 kg) performed 1 lap of a 3.48 km mountain bike (MTB) course as fast as possible on 26″, 27.5″ and 29″ wheeled MTB. Time (s), mean power (W), cadence (revs · min?1) and velocity (km · h?1) were recorded for the whole lap and during ascent and descent sections. One-way repeated measure ANOVA was used to determine significant differences. Results revealed no significant main effects for any variables by wheel size during all trials, with the exception of cadence during the descent (F(2, 16) = 8.96; P = .002; P2 = .53). Post hoc comparisons revealed differences lay between the 26″ and 29″ wheels (P = .02). The findings indicate that wheel size does not significantly influence performance during cross-country when ridden by trained mountain bikers, and that wheel choice is likely due to personal choice or sponsorship commitments.  相似文献   
993.
994.
A multidimensional, time-dependent model of the thermocline degradation in a packed bed thermal storage tank is presented. The formulation includes the effects of finite tank length, multidimensional thermal conduction, heat transfer between the fluid and solid portions of the bed, and heat losses across all tank surfaces. The technique used to solve the coupled pair of parabolic partial differential equations describing the degradation of the thermocline is based on a vectorized separation of variables approach. Assuming cylindrical geometry, the analysis leads to separate eigenvalue problems for the radial, angular, and axial spatial dependencies of the fluid and solid temperatures in the bed. The eigenvalues are readily calculated and the corresponding eigenfunctions are shown to form a complete set of spatial basis functions for the solution space. The method and results are illustrated by several examples.  相似文献   
995.
996.
60 Ss took a program in one of three ways: writing the answer, “thinking” the answer without writing it, or reading a program with the answers filled in. Results indicated no significant differences among the groups on two measures of amount learned. Low positive correlations were obtained between amount learned and IQ and reading comprehension of the Ss. Percent error on test frames within the program was negatively correlated with adjusted gain scores (r = −0.71). Results were also related to possible pragmatic applications.  相似文献   
997.
998.
This paper describes briefly a methodology for developing multiple-choice critical thinking tests which attempts to overcome certain problems of validity and fairness facing such tests. The paper proposes that direct evidence on test validity be gathered using verbal reports of students' thinking on trial items.  相似文献   
999.
1000.
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