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   641篇
  免费   14篇
教育   520篇
科学研究   13篇
各国文化   7篇
体育   54篇
文化理论   4篇
信息传播   57篇
  2023年   6篇
  2022年   6篇
  2021年   5篇
  2020年   14篇
  2019年   32篇
  2018年   36篇
  2017年   30篇
  2016年   30篇
  2015年   17篇
  2014年   26篇
  2013年   187篇
  2012年   14篇
  2011年   15篇
  2010年   20篇
  2009年   16篇
  2008年   10篇
  2007年   28篇
  2006年   14篇
  2005年   9篇
  2004年   12篇
  2003年   14篇
  2002年   7篇
  2001年   10篇
  2000年   13篇
  1999年   7篇
  1998年   3篇
  1997年   5篇
  1996年   3篇
  1995年   7篇
  1994年   4篇
  1993年   2篇
  1992年   4篇
  1991年   7篇
  1990年   2篇
  1989年   5篇
  1987年   6篇
  1985年   3篇
  1984年   3篇
  1981年   3篇
  1979年   2篇
  1974年   1篇
  1971年   1篇
  1970年   1篇
  1969年   1篇
  1966年   1篇
  1965年   1篇
  1962年   1篇
  1961年   1篇
  1955年   1篇
  1920年   1篇
排序方式: 共有655条查询结果,搜索用时 15 毫秒
1.
Abstract

Carnosine was originally discovered in skeletal muscle, where it exists in larger amounts than in other tissues. The majority of research into the physiological roles of carnosine have been conducted on skeletal muscle. Given this and the potential for muscle carnosine content to be increased with supplementation, there is now a large body of research examining the ergogenic effects (or otherwise) of carnosine. More recent research, however, points towards a potential for carnosine to exert a wider range of physiological effects in other tissues, including the brain, heart, pancreas, kidney and cancer cells. Taken together, this is suggestive of a potential for carnosine to have therapeutic benefits in health and disease, although this is by no means without complication. Herein, we will provide a review of the current literature relating to the potential therapeutic effects of carnosine in health and disease.  相似文献   
2.
Book reviews     
Association of Research Libraries  相似文献   
3.
4.
5.
Field work and structured interviews with 139 foreign sojourners in India were analyzed to describe the socialization of aliens into their role. Attitude scales measuring favorability toward the host country and people were also examined in relation to the respondent's occupational status and elapsed time in India. The results from the field work and interviews suggest that the privileges and high status accorded many Western visitors may contribute to the visitors' derogation of their hosts, a process which is often subtle but unmistakable. The visitors appear to become socialized into the world of aliens rather than the world of their hosts. The higher the visitor's status and the longer the elapsed time in India, the more pronounced these patterns appear. While the correlational nature of the study makes it impossible to determine whether persons with initially unfavorable attitudes are selected into the high status positions or whether the positions themselves create such attitudes, it appears reasonable to conclude that there would be less derogation and alienation if the lures of status and money were removed; persons would be neither selected nor influenced by such factors.  相似文献   
6.
7.
8.
The aims of this study were to describe normative values and seasonal variation of body composition in female cyclists comparing female road and track endurance cyclists, and to validate the use of anthropometry to monitor lean mass changes. Anthropometric profiles (seven site skinfolds) were measured over 16 years from 126 female cyclists. Lean mass index (LMI) was calculated as body weight?×?skinfolds?x. The exponent (x) was calculated as the slope of the natural logarithm of body weight and skinfolds. Percentage changes in LMI were compared to lean mass changes measured using dual-energy X-ray absorptiometry (DXA) in a subset of 25 road cyclists. Compared to sub-elite and elite cyclists, world class cyclists were (mean [95% CI]) 1.18?kg [0.46, 1.90] and 0.60?kg [0.05, 1.15] lighter and had skinfolds that were 7.4?mm [3.8, 11.0] and 4.6?mm [1.8, 7.4] lower, respectively. Body weight (0.41?kg [0.04, 0.77]) and skinfolds (4.0?mm [2.1, 6.0]) were higher in the off-season compared to the early-season. World class female road cyclists had lower body weight (6.04?kg [2.73, 9.35]) and skinfolds (11.5?mm [1.1, 21.9]) than track endurance cyclists. LMI (mean exponent 0.15 [0.13, 0.18]) explained 87% of the variance in DXA lean mass. In conclusion, higher performing female cyclists were lighter and leaner than their less successful peers, road cyclists were lighter and leaner than track endurance cyclists, and weight and skinfolds were lowest early in the season. LMI appears to be a reasonably valid tool for monitoring lean mass changes.  相似文献   
9.
This study examined how one academic framed the enablements and constraints to her project of being and becoming an academic. Complexity facilitated reflection in that it provided a visual representation of data, which was used to generate a concept map, which represented as equal all the component parts of her landscape. Five spaces with emancipatory potential to assist the academic in her professional development emerged, namely: communities of practice, academic freedom, position statements, development opportunities and a supportive environment. Rather than suggesting any generalisability in the findings, the authors argue that the significance of this study is theoretical and methodological. Complexity theory has the potential to help academic development practitioners understand the landscapes in which their academics operate, and guide appropriate development opportunities.  相似文献   
10.
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