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   3681篇
  免费   17篇
  国内免费   3篇
教育   2777篇
科学研究   172篇
各国文化   53篇
体育   305篇
文化理论   56篇
信息传播   338篇
  2022年   24篇
  2021年   26篇
  2020年   49篇
  2019年   103篇
  2018年   92篇
  2017年   126篇
  2016年   106篇
  2015年   62篇
  2014年   105篇
  2013年   835篇
  2012年   83篇
  2011年   85篇
  2010年   70篇
  2009年   90篇
  2008年   106篇
  2007年   86篇
  2006年   73篇
  2005年   68篇
  2004年   61篇
  2003年   64篇
  2002年   69篇
  2001年   59篇
  2000年   80篇
  1999年   56篇
  1998年   48篇
  1997年   40篇
  1996年   43篇
  1995年   36篇
  1994年   36篇
  1993年   46篇
  1992年   46篇
  1991年   45篇
  1990年   42篇
  1989年   38篇
  1988年   34篇
  1987年   38篇
  1986年   36篇
  1985年   43篇
  1984年   31篇
  1983年   27篇
  1982年   33篇
  1981年   40篇
  1980年   29篇
  1979年   44篇
  1978年   38篇
  1977年   33篇
  1976年   31篇
  1975年   18篇
  1974年   18篇
  1973年   15篇
排序方式: 共有3701条查询结果,搜索用时 0 毫秒
981.
    
To examine the reproducibility of three measurement techniques used to determine creatine kinase, interleukin-6 and high-sensitivity C-reactive protein, 50 participants had blood samples taken on two occasions. Fingertip plasma samples were analysed using the Reflotron for CK determination. Venous blood samples collected into serum separator tubes were used for IL-6 and hs-CRP analyses. IL-6 was measured using an enzyme linked immune assay development kit. The hs-CRP was measured by an in-house ELISA method. Dependent t-tests showed no systematic bias between samples. The interdian CV was 20.0% for CK, 15.3% for IL-6 and 44.2% for hs-CRP. The intraclass correlation coefficient was 0.90 for CK, 0.98 for IL-6 and 0.70 for hs-CRP. The 95% limits of agreement were ?69.7 to 63.5 IU/L for CK, ?1.48 to 1.80 pg/ml for IL-6 and ?1.10 to 0.91 µg/L for hs-CRP. The results demonstrate low absolute reproducibility, which may obscure a true experimental effect.  相似文献   
982.
    
  相似文献   
983.
    
The aim of this study is to examine the prevalence and correlates of adolescents’ resistance training (RT) skill competence. Participants were 548 adolescents (14.1 ± 0.5 years) from 16 schools in New South Wales, Australia. RT skills were assessed using the Resistance Training Skills Battery. Demographics, BMI, muscular fitness, perceived strength, RT self-efficacy, and motivation for RT were also assessed. The proportion demonstrating “competence” and “near competence” in each of the six RT skills were calculated and sex differences explored. Associations between the combined RT skill score and potential correlates were examined using multi-level linear mixed models. Overall, the prevalence of competence was low (range = 3.3% to 27.9%). Females outperformed males on the squat, lunge and overhead press, whereas males performed better on the push-up (< .05). Significant associations were seen for a number of correlates, which largely differed by sex. Muscular fitness was moderately and positively associated with RT skills among both males (β = 0.34, 95%CIs = 0.23 to 0.46) and females (β = 0.36, 95%CIs = 0.23 to 0.48). Our findings support a link between RT skills and muscular fitness. Other associations were statistically significant but small in magnitude, and should therefore be interpreted cautiously.  相似文献   
984.
    
The goal of an offensive Rugby Union lineout is to throw the ball in a manner that allows your team to maintain possession. Typically, the player catching the ball jumps and is lifted upwards by two teammates, reaching above the opposing player who is competing for the ball also. Despite various beliefs regarding the importance of the jumper’s mass and attempted jump height, and lifters’ magnitude and point of force application, there is negligible published data on the topic. The squeeze technique is one lifting method commonly employed by New Zealand teams during lineout plays, whereby the jumper initiates the jump quickly and the lifters provide assistance only once the jumper reaches 20–30 cm. While this strategy may reduce cues to the opposition, it might also constrain the jumper and lifters. We developed a model to explore how changes in the jumper’s body mass and attempted jump height, and lifters’ magnitude and point of force application influence the time to reach peak catch height. The magnitude of the lift force impacted the time-to-reach peak catch height the most; followed by the jumper’s (attempted) jump height and body mass; and lastly, the point of lift force application.  相似文献   
985.
The Fédération Internationale de Football Association, or FIFA, is a non-governmental organization located in Switzerland that is responsible for overseeing the quadrennial World Cup football (soccer) competition in addition to its jurisdiction over other various international competitions and aspects of international football. The organization, long accused of corruption, has in recent years been increasingly criticized by observers and stakeholders for its lack of transparency and accountability. In 2011 FIFA initiated a governance reform process which will come to a close in May 2013. This paper draws on literature in the field of international relations to ask and answer the question: how can FIFA be held accountable? The paper's review finds that the answer to this question is “not easily.” The experience in reforming the International Olympic Committee (IOC) more than a decade ago provides one model for how reform might occur in FIFA. However, any effective reform will require the successful and simultaneous application of multiple mechanisms of accountability. The FIFA case study has broader implications for understanding mechanisms of accountability more generally, especially as related to international non-governmental organizations.  相似文献   
986.
    
  相似文献   
987.
Medical image retrieval can assist physicians in finding information supporting their diagnosis and fulfilling information needs. Systems that allow searching for medical images need to provide tools for quick and easy navigation and query refinement as the time available for information search is often short. Relevance feedback is a powerful tool in information retrieval. This study evaluates relevance feedback techniques with regard to the content they use. A novel relevance feedback technique that uses both text and visual information of the results is proposed. The two information modalities from the image examples are fused either at the feature level using the Rocchio algorithm or at the query list fusion step using a common late fusion rule. Results using the ImageCLEF 2012 benchmark database for medical image retrieval show the potential of relevance feedback techniques in medical image retrieval. The mean average precision (mAP) is used as the evaluation metric and the proposed method outperforms commonly-used methods. The baseline without feedback reached 16 % whereas the relevance feedback with 20 images reached up to 26.35 % with three steps and when using 100 images up to 34.87 % in four steps. Most improvements occur in the first two steps of relevance feedback and then results start to become relatively flat. This might also be due to only using positive feedback as negative feeback often also improves results after more steps. The effect of relevance feedback in automatically spelling corrected and translated queries is investigated as well. Results without mistakes were better than spell-corrected results but the spelling correction more than double results over non-corrected retrieval. Multimodal relevance feedback has shown to be able to help visual medical information retrieval. Next steps include integrating semantics into relevance feedback techniques to benefit from the structured knowledge of ontologies and experimenting on the fusion of text and visual information.  相似文献   
988.
989.
In 2010, the Association for the Advancement of Sustainability in Higher Education released, “Sustainability curriculum in higher education: A call to action,” encouraging infusion of sustainability topics into universities' teaching and research. Since then, academic programs and research related to social, economic, and environmental sustainability have enriched university curricula. An exploratory study was conducted to determine the position and engagements of academic libraries and information science schools in their contributions to scholarly sustainability activities and curricular initiatives. This article presents the results of the study which reveals a number of engagements by library professionals in the areas of sustainability, such as increasing open access to research, building sustainability-related collections and research guides, and incorporating sustainability content into information literacy. While academic libraries and information science schools are engaged in a broad spectrum of initiatives that support their institutions' sustainability research and curricular functions, this study indicates that such activities require a more targeted approach.  相似文献   
990.
The article considers current proposals for the contribution of central government departments towards the effective management of vocational education and training in The United Kingdom. Starting from some broad assumptions about the objectives of vocational education and training, an attempt is made to place discussions about what roles the Department of Education and Science and the Department of Employment/Manpower Services Commission should play in this field within the context of events that have occurred over the past forty years. Three alternative forms of management relationships are considered, two of which recommend the formation of a new department, either a Department of Education and Training or a Department of Employment and Vocational Training, while the third supports a refinement of present ad hoc inter‐departmental arrangements. After examining the perceived advantages and disadvantages of these proposals, it is suggested that a new central government management system is required in order to provide a more systematic response. The article concludes with the suggestions that such a system might have consequences for institutional change, individual freedom of choice and the improvement of opportunities for disadvantaged groups different from those that are usually predicted.  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