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   24341篇
  免费   418篇
  国内免费   32篇
教育   17629篇
科学研究   2045篇
各国文化   241篇
体育   1820篇
综合类   34篇
文化理论   201篇
信息传播   2821篇
  2022年   140篇
  2021年   256篇
  2020年   414篇
  2019年   567篇
  2018年   793篇
  2017年   861篇
  2016年   793篇
  2015年   469篇
  2014年   658篇
  2013年   4660篇
  2012年   618篇
  2011年   680篇
  2010年   518篇
  2009年   506篇
  2008年   568篇
  2007年   541篇
  2006年   489篇
  2005年   419篇
  2004年   403篇
  2003年   369篇
  2002年   408篇
  2001年   467篇
  2000年   431篇
  1999年   428篇
  1998年   228篇
  1997年   241篇
  1996年   270篇
  1995年   227篇
  1994年   223篇
  1993年   205篇
  1992年   315篇
  1991年   313篇
  1990年   339篇
  1989年   328篇
  1988年   321篇
  1987年   267篇
  1986年   269篇
  1985年   335篇
  1984年   275篇
  1983年   260篇
  1982年   210篇
  1981年   215篇
  1980年   181篇
  1979年   250篇
  1978年   221篇
  1977年   202篇
  1976年   168篇
  1975年   135篇
  1974年   129篇
  1973年   153篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
Fifty-nine children in kindergarten, first, and second grade were given the WISC information and arithmetic subtest. Approximately three weeks later, the subjects were presented with the same questions, and four multiple choice answers were shown and read to them. The number of correct responses on each subtest for each presentation method was recorded. The multiple choice method of presentation response yielded significantly higher scaled scores than did the standard WISC presentation with the free response mode of testing.  相似文献   
992.
993.
Self-esteem was found to have a moderate relationship with, but not a strong independent effect on, school achievement and behavior for a sample of 530 twelve-year-olds. From multiple correlation coefficients predicting school outcomes from measures of socioeconomic status, IQ, and self-esteem, it was concluded that much of the relationship between self-esteem and school performance for the general school population can best be explained as reflecting common underlying factors such as ability and background.  相似文献   
994.
995.
BackgroundIndividuals with diabetes have greater central arterial stiffness, wave reflections, and hemodynamics, all of which promote the accelerated cardiovascular pathology seen in this population. Acute aerobic exercise has been shown to be an effective strategy for reducing central arterial stiffness, wave reflections, and hemodynamics in healthy individuals; however, the effects of acute aerobic exercise in reducing these outcomes is not well established in people with diabetes. Recently, implementation of high-intensity interval exercise (HIIE) has shown superior improvements in cardiovascular health outcomes when compared to traditional aerobic exercise. Yet, the effect of HIIE on the aforementioned outcomes in people with diabetes is not known. The purpose of this study was to (i) describe the central arterial stiffness, wave reflections, and hemodynamic responses to a bout of HIIE and moderate-intensity continuous exercise (MICE) in adults with diabetes; and (ii) compare the effects of HIIE and MICE on the aforementioned outcomes.MethodsA total of 24 adult men and women (aged 29–59 years old) with type 1 (n = 12) and type 2 (n = 12) diabetes participated in a randomized cross-over study. All participants completed the following protocols: (i) HIIE: cycling for 4 × 4 min at 85%–95% of heart rate peak (HRpeak), interspersed with 3 min of active recovery at 60%–70%HRpeak; (ii) MICE: 33 min of continuous cycling at 60%–70%HRpeak; and (iii) control (CON): lying quietly in a supine position for 30 min.ResultsA significant group × time effect was found for changes in central systolic blood pressure (F = 3.20, p = 0.01) with a transient reduction for the HIIE group but not for the MICE or CON groups. There was a significant group × time effect for changes in augmentation index at a heart rate of 75 beats/min (F = 2.32, p = 0.04) with a decrease following for HIIE and MICE but not for CON. For all other measures of central arterial stiffness and hemodynamics, no significant changes were observed (p > 0.05).ConclusionA bout of HIIE appears to lead to a greater transient reduction in central systolic blood pressure than the reduction observed following MICE; however, both HIIE and MICE improved augmentation index at a heart rate of 75 beats/min in people with diabetes. There was no significant difference in response to HIIE and MICE in all outcomes. This provides preliminary evidence on the role of HIIE on such outcomes in people with diabetes.  相似文献   
996.
997.
Kerlinger's theory of social attitudes asserts that attitudes toward educational practices can be represented by the independent dimensions of progres-sivism and traditionalism. This study focused on the relationship between these attitudes and the philosophies of realism and pragmatism. A sample of 152 graduate students in education completed three instruments measuring educational attitudes and the basic and applied philosophies. Factor analytic results supported a dualistic theory rather than a bipolar theory for attitudes and philosophies. Pragmatists supported the progressive referents of children's interests and social development as educational goals, while realistsy supported traditional concepts emphasizing structure and the learning of content. The results are discussed in terms of the consistency between educational attitudes and a teacher's philosophy.  相似文献   
998.
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