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   8973篇
  免费   213篇
  国内免费   174篇
教育   6197篇
科学研究   1273篇
各国文化   17篇
体育   909篇
综合类   727篇
文化理论   12篇
信息传播   225篇
  2024年   10篇
  2023年   30篇
  2022年   85篇
  2021年   155篇
  2020年   184篇
  2019年   175篇
  2018年   140篇
  2017年   164篇
  2016年   176篇
  2015年   264篇
  2014年   572篇
  2013年   667篇
  2012年   747篇
  2011年   709篇
  2010年   533篇
  2009年   462篇
  2008年   561篇
  2007年   607篇
  2006年   656篇
  2005年   604篇
  2004年   494篇
  2003年   367篇
  2002年   304篇
  2001年   271篇
  2000年   132篇
  1999年   65篇
  1998年   44篇
  1997年   32篇
  1996年   40篇
  1995年   32篇
  1994年   16篇
  1993年   26篇
  1992年   18篇
  1991年   6篇
  1990年   6篇
  1989年   3篇
  1988年   1篇
  1979年   1篇
  1978年   1篇
排序方式: 共有9360条查询结果,搜索用时 15 毫秒
61.
Abstract

This paper examines the confluence of global, regional, and national politics in the lead up to the 1991 Pan-American Games hosted by Cuba. Cuba’s contentious selection as host was wholly underpinned by the international politics of the time. Once selected, the preparations for the Games in Havana were surrounded by an unprecedented domestic economic crisis fueled by shifts in global politics. This paper analyzes how international politics informed the hosting of the 1991 Pan-American Games, and shaped the political challenge the Cuban government faced in hosting such an event. The Revolution’s use of sport domestically and internationally came to the forefront in its efforts as host and the results of those efforts proved to be providential given the emerging political economic contexts during and in the ensuing years after the Games.  相似文献   
62.
Abstract

Physical exercise, beyond the mere physical aspect, is very much a social construct. But it is as well a means of constructing the social and as such it can be used in different ways. The contribution, taking a broad comparative perspective, will reflect on two major possibilities: the one may be called social inclusion as subordination and the other can be looked at as a matter of social inclusion by strengthening individuals. This also allows an understanding of new dangers of exclusion in the era of liquid modernity.  相似文献   
63.
中国传统的文化背景始终存在大传统与小传统的对立与交融。其中大传统始终是历史的主流 ,是历史学家的关注所在。而小传统则相对处在话语弱势与忽略之中。然而小传统下的世俗社会的发展始终延续着 ,是没有被历史记录的另一条历史线索。将小传统纳入历史话语权力中 ,从而呈现历史与社会的全貌 ,是史学发展的新方向 ,也是现代历史学家面临的课题与挑战  相似文献   
64.
针对具有非期望输出决策单元DMU的相对有效性 ,提出对其进行评价的非径向FDEA模型 ,并给出模型的相对有效性理论证明 .结合实际算例 ,指出FDEA模型在实际生产过程中对于节约生产资源 ,提高期望输出 ,降低非期望输出 ,特别是减少环境污染有重要应用价值 .  相似文献   
65.
哲学社会科学成果与自然科学成果同样重要,哲学社会科学成果也是综合国力的体现,这是由哲学社会科学的地位所决定的,是由改革开放20多年坚持理论创新取得巨大成就的事实和中国历史史实所证明了的。而以美国为首的西方敌对势力推行的思想化渗透政策的巨大危害,又从反面证明了哲学社会科学成果对综合国力的影响。  相似文献   
66.
汉语"道歉"话语模式   总被引:2,自引:1,他引:2  
道歉是交际中的一种补救性施事言语行为,也是一种礼貌的社会行为。其基本功能是为一项冒犯行为提供补救办法,恢复社会平衡与和谐。从语言形式来看,道歉具有语义句法程式化和规约化的普遍特征。本用语篇补全测试的问卷形式通过对汉语中道歉行为实施的调查、对所选策略进行了分类统计,结果表明道歉的话语模式包括多种策略和手段的组合,但策略的选用在很大程度上受到如权势、距离等因素的制约,说明道歉行为对化等因素的依赖。  相似文献   
67.
在国内外的研究基础上,结合安徽特有的基本情况,建立了一套评价安徽省各市R&D投入产出综合水平指 标体系,运用主成分分析和聚类分析,客观的评价了安徽省各地市R&D投入产出水平。评价结果表明,“合芜蚌”试验 区引领带动着全省R&D投入产出水平,“皖江带”城市R&D投入产出水平两极分化严重,而“皖北”地区则有崛起的势 头,从而为各市提升R&D投入产出水平提供参考依据。  相似文献   
68.
通过构建科技创新体系评价指标,研究山东省会城市群经济圈科技投入与发展现状。运用熵值法确定指标 权重,对科技创新的核心因素进行深入分析,结合聚类分析法对经济圈内各地市的科技投入与产出情况进行比较评价 和分类研究,并给出提升经济圈科技投入与产出水平的对策建议。  相似文献   
69.
Caffeine and coffee are widely used among active individuals to enhance performance. The purpose of the current study was to compare the effects of acute coffee (COF) and caffeine anhydrous (CAF) intake on strength and sprint performance. Fifty-four resistance-trained males completed strength testing, consisting of one-rep max (1RM) and repetitions to fatigue (RTF) at 80% of 1RM for leg press (LP) and bench press (BP). Participants then completed five, 10-second cycle ergometer sprints separated by one minute of rest. Peak power (PP) and total work (TW) were recorded for each sprint. At least 48 hours later, participants returned and ingested a beverage containing CAF (300?mg flat dose; yielding 3–5?mg/kg bodyweight), COF (8.9?g; 303?mg caffeine), or placebo (PLA; 3.8?g non-caloric flavouring) 30 minutes before testing. LP 1RM was improved more by COF than CAF (p?=?.04), but not PLA (p?=?.99). Significant interactions were not observed for BP 1RM, BP RTF, or LP RTF (p?>?.05). There were no sprint?×?treatment interactions for PP or TW (p?>?.05). 95% confidence intervals revealed a significant improvement in sprint 1 TW for CAF, but not COF or PLA. For PLA, significant reductions were observed in sprint 4 PP, sprint 2 TW, sprint 4 TW, and average TW; significant reductions were not observed with CAF or COF. Neither COF nor CAF improved strength outcomes more than PLA, while both groups attenuated sprint power reductions to a similar degree. Coffee and caffeine anhydrous may be considered suitable pre-exercise caffeine sources for high-intensity exercise.  相似文献   
70.
The cadence that maximises power output developed at the crank by an individual cyclist is conventionally determined using a laboratory test. The purpose of this study was two-fold: (i) to show that such a cadence, which we call the optimal cadence, can be determined using power output, heart-rate, and cadence measured in the field and (ii) to describe methodology to do so. For an individual cyclist's sessions, power output is related to cadence and the elicited heart-rate using a non-linear regression model. Optimal cadences are found for two riders (83 and 70 revolutions per minute, respectively); these cadences are similar to the riders’ preferred cadences (82–92?rpm and 65–75?rpm). Power output reduces by approximately 6% for cadences 20?rpm above or below optimum. Our methodology can be used by a rider to determine an optimal cadence without laboratory testing intervention: the rider will need to collect power output, heart-rate, and cadence measurements from training and racing sessions over an extended period (>6 months); ride at a range of cadences within those sessions; and calculate his/her optimal cadence using the methodology described or a software tool that implements it.  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