全文获取类型
收费全文 | 115798篇 |
免费 | 1860篇 |
国内免费 | 234篇 |
专业分类
教育 | 79737篇 |
科学研究 | 13261篇 |
各国文化 | 1972篇 |
体育 | 9248篇 |
综合类 | 171篇 |
文化理论 | 1052篇 |
信息传播 | 12451篇 |
出版年
2021年 | 897篇 |
2020年 | 1653篇 |
2019年 | 2541篇 |
2018年 | 3013篇 |
2017年 | 3302篇 |
2016年 | 3349篇 |
2015年 | 2290篇 |
2014年 | 3165篇 |
2013年 | 27181篇 |
2012年 | 2319篇 |
2011年 | 2646篇 |
2010年 | 2291篇 |
2009年 | 2591篇 |
2008年 | 2329篇 |
2007年 | 2050篇 |
2006年 | 2306篇 |
2005年 | 2289篇 |
2004年 | 2970篇 |
2003年 | 2308篇 |
2002年 | 2021篇 |
2001年 | 1890篇 |
2000年 | 1476篇 |
1999年 | 1335篇 |
1998年 | 1266篇 |
1997年 | 1334篇 |
1996年 | 1543篇 |
1995年 | 1353篇 |
1994年 | 1335篇 |
1993年 | 1334篇 |
1992年 | 1343篇 |
1991年 | 1241篇 |
1990年 | 1273篇 |
1989年 | 1170篇 |
1988年 | 1020篇 |
1987年 | 971篇 |
1986年 | 983篇 |
1985年 | 1226篇 |
1984年 | 1140篇 |
1983年 | 1074篇 |
1982年 | 1065篇 |
1981年 | 998篇 |
1980年 | 960篇 |
1979年 | 1035篇 |
1978年 | 1028篇 |
1977年 | 942篇 |
1976年 | 862篇 |
1975年 | 690篇 |
1974年 | 687篇 |
1973年 | 661篇 |
1972年 | 495篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
Jeroen C.M. Barte Arne Nieuwenhuys Sabine A.E. Geurts Michiel A.J. Kompier 《Journal of sports sciences》2019,37(10):1189-1196
Recent theories suggest that negative effects of fatigue on performance are determined by perception of effort and motivation rather than being directly caused by reaching physiological limits. In the current experiment, the influence of motivation on fatigue-induced decrements in soccer performance was experimentally investigated. Sixty amateur soccer players performed a validated soccer-passing test before and after a fatigue protocol. Results showed that players’ motivation and performance decreased after the fatigue protocol for players in the control group. In contrast, players in the motivation group (i.e., with motivation experimentally induced after the fatigue protocol) were able to uphold their motivation and increase their performance. These results indicate that motivation plays a crucial role in performance under fatigue, as fatigue-induced decrements in soccer passing performance can be counteracted by high levels of motivation. Future research may explore the limits of this counteracting effect and extend findings to other relevant performance aspects. 相似文献
52.
53.
54.
Hypocalcemia is a laboratory and clinical abnormality that is observed especially in neonates and paediatric patients. Laboratory hypocalcaemia is often asymptomatic but it can manifest as central nervous system irritability, paraesthesia, tetany (i.e. contraction of hands, arms, feet, larynx, bronchioles), seizures, and even psychiatric changes in children. Cardiac function may also be impaired because of poor muscle contractility. We report a unique case of an eleven year old male child who presented with chronic kidney disease associated with severe hypocalcemia, tonic-clonic seizures, hypovitaminosis D but normal electroencephalogram and electrocardiography. The child required prolonged intravenous calcium gluconate therapy to correct his ionised calcium levels. 相似文献
55.
56.
Purpose: Overuse injuries are common in sport, but complete understanding of injury risk factors remains incomplete. Although biomechanical studies frequently examine musculoskeletal injury mechanisms, human movement variability studies aim to better understand neuromotor functioning, with proposed connections between overuse injury mechanisms and changes in motor variability. Method: In a narrative review, we discuss the variability-overuse injury hypothesis, which suggests repeated load application leads to mechanical tissue breakdown and subsequent injury when exceeding the rate of physiological adaptation. Due to the multidisciplinary nature of this hypothesis, we incorporate concepts from motor control, neurophysiology, biomechanics, as well as research design and data analysis. We therefore summarize multiple perspectives while proposing theoretical relationships between movement variability and lower extremity overuse injuries. Results: Experimental data are presented and summarized from published experiments examining interactions between experimental task demands and movement variability in the context of drop landing movements, along with comparisons to previous movement variability studies. Conclusion: We provide a conceptual framework for sports medicine researchers interested in predicting and preventing sports injuries. Under performance conditions with greater task demands, we predict reduced trial-to-trial movement variability that could increase the likelihood of overuse injuries. 相似文献
57.
Michael S. Brady 《体育哲学杂志》2019,46(2):115-128
ABSTRACTNearly everyone agrees that physical pain is bad. Indeed, if anything merits the status of a platitude in our everyday thinking about value, the idea that pain is bad surely does. Equally, it seems clearly true that emotional suffering – despair, loneliness, grief, disappointment, guilt, shame, lovesickness, and the like – are all bad as well. We are strongly inclined to pity and feel sorry for those who suffer emotionally in these ways; we are motivated, at least some of the time, to do what we can to alleviate their suffering. Given this, it might seem curious that pain and suffering are so integral to sport – whether one is a participant or a spectator. There’s nothing particularly puzzling about pain and suffering that is inadvertently related to sport – as when an athlete injures her hamstring and has to miss her chance at Olympic glory, or when supporters face the misery of getting up at 6am because an away game has been scheduled to start at noon. But there does seem to be something curious about the extent to which pain and suffering are voluntarily embraced by participants and spectators, as the quotation from Nick Hornby aptly illustrates. Why do people willingly engage in something that brings about so much suffering? In this paper, I’ll attempt to answer this question.1 相似文献
58.
Experience is Not The Whole Story: The Integral Role of the Situation in Dewey's Democracy and Education 下载免费PDF全文
DAVID L. HILDEBRAND 《Journal of Philosophy of Education》2018,52(2):287-300
The central objective of Dewey's Democracy and Education is to explain ‘what is needed to live a meaningful life and how can education contribute?’ While most acquainted with Dewey's educational philosophy know that ‘experience’ plays a central role, the role of ‘situations’ may be less familiar or understood. This essay explains why ‘situation’ is inseparable from ‘experience’ and deeply important to Democracy and Education’s educational methods and rationales. First, a prefatory section explores how experience is invoked and involved in pedagogical practice, especially experience insofar as it is (a) experimental, (b) direct, and (c) social‐moral in character. The second and main section on situations follows. After a brief introduction to Dewey's special philosophical use of ‘situation’, I examine how situations are implicated in (a) student interest and motivation; (b) ‘aims’ and ‘criteria’ in problem‐solving; and (c) moral education (habits, values, and judgements). What should become abundantly clear from these examinations is that there could be no such thing as meaningful education, as Dewey understood it, without educators’ conscious, intentional, and imaginative deployment of experience and situations. 相似文献
59.