全文获取类型
收费全文 | 291篇 |
免费 | 6篇 |
国内免费 | 2篇 |
专业分类
教育 | 179篇 |
科学研究 | 41篇 |
各国文化 | 4篇 |
体育 | 37篇 |
文化理论 | 5篇 |
信息传播 | 33篇 |
出版年
2024年 | 1篇 |
2022年 | 3篇 |
2021年 | 8篇 |
2020年 | 2篇 |
2019年 | 8篇 |
2018年 | 9篇 |
2017年 | 6篇 |
2016年 | 9篇 |
2015年 | 7篇 |
2014年 | 7篇 |
2013年 | 55篇 |
2012年 | 12篇 |
2011年 | 10篇 |
2010年 | 8篇 |
2009年 | 12篇 |
2008年 | 17篇 |
2007年 | 10篇 |
2006年 | 4篇 |
2005年 | 7篇 |
2004年 | 3篇 |
2003年 | 8篇 |
2002年 | 5篇 |
2001年 | 4篇 |
2000年 | 3篇 |
1999年 | 3篇 |
1998年 | 4篇 |
1997年 | 4篇 |
1996年 | 3篇 |
1995年 | 2篇 |
1994年 | 8篇 |
1993年 | 5篇 |
1992年 | 4篇 |
1991年 | 5篇 |
1990年 | 7篇 |
1989年 | 1篇 |
1988年 | 5篇 |
1987年 | 2篇 |
1986年 | 3篇 |
1985年 | 6篇 |
1984年 | 1篇 |
1983年 | 2篇 |
1982年 | 1篇 |
1981年 | 4篇 |
1979年 | 1篇 |
1977年 | 1篇 |
1974年 | 1篇 |
1973年 | 3篇 |
1960年 | 1篇 |
1943年 | 2篇 |
1847年 | 2篇 |
排序方式: 共有299条查询结果,搜索用时 328 毫秒
61.
Frank I. Michel Kai-Uwe Schmitt Richard M. Greenwald Kelly Russell Frank I. Simpson David Schulz Mike Langran 《Sports Engineering》2013,16(4):197-210
The wrist is the most frequently injured body region among snowboarders. Studies have shown that the risk of sustaining a wrist injury can be reduced by wearing wrist protection. Currently, there are a wide variety of wrist protection products for snowboarding on the market that offer a range of protective features. However, there are no minimum performance standards for snowboarding wrist protectors worldwide. The International Society for Skiing Safety convened a task force to develop a White Paper to evaluate the importance and necessity of a minimum performance for all wrist protectors used in snowboarding. The White Paper outlines the need for a general framework for a harmonized international standard and reviews the existing evidence. Therefore, this White Paper may serve as a common base for future discussions. The broader goal of developing and implementing such a standard is to reduce the incidence and the severity of wrist injuries in snowboarding without increasing the risk of adverse events, such as upper arm or shoulder injury. The European standard for inline skating wrist protectors (EN 14120) can serve as a starting point for efforts related to a standard for snowboard wrist protectors, but certain modifications to the standard would be required. It is hypothesized that implementation of a snowboarding wrist protector standard would result in fewer and less severe wrist injuries in the sport and could translate into more riding days for healthy snowboarders and significant health-care costs savings. 相似文献
62.
This review study focuses on knee injuries in recreational alpine skiing. The objectives of this study were (1) to provide selected knowledge derived from current and past knee injury epidemiology; (2) to outline the most important knee injury mechanisms; and (3) to review and discuss how modifications of the skiing equipment might alleviate the risk of knee injuries. This review represents the essence of a comprehensive research report and considers the content of more than 230 scientific papers, further “grey literature”, patents, international standards and other publications. Knee injuries are the most frequent injuries in alpine skiing and their incidence rate remained high despite a decline of the incidence of other skiing injuries in recent years. Women have a higher knee injury risk, but age and tiredness appear not to be significant factors. Apart from the commonly described injury mechanisms “phantom foot” and “boot-induced anterior drawer” other more sophisticated injury categorisations are given. The ski radius, the ski length and the standing height on the ski may be relevant ski parameters. For the binding, the release mechanisms in different mechanical degrees of freedom, the impact tolerance and the maintenance frequency are discussed. In the ski boot, the height of the upper, the boot liner, the shaft stiffness, and the position on the ski may play a role. The biggest challenge, but probably also the biggest opportunity for a reduction of knee injury rates seems to be the development of a mechatronic binding. The current strategies to develop these types of bindings are explained and illustrated by one example. Some of the possible parameters which may be essential for the necessary control algorithms are described. Finally, considerations regarding the strategic and operational implication of the analysed technical measures are given. 相似文献
63.
64.
65.
Mathias Urban Michel Vandenbroeck Katrien Van Laere Arianna Lazzari Jan Peeters 《European Journal of Education》2012,47(4):508-526
The close connection between the quality of provision for young children and professionaliation of the field has long been supported by international research. That the two are inseparable aspects of one picture is beginning to become accepted at European policy level, as evident in recent high level EU policy documents. This article explores the reciprocal relationship between quality and professionalisation, drawing on the findings of the study on ‘competence requirements in early childhood education and care’ (CoRe), jointly conducted by the University of East London and the University of Gent, and funded by the European Commission. Based on a review of literature in several European languages and data from a 15-country survey and seven in-depth case studies, CoRe has identified systemic conditions for a professionalisation of the entire early childhood system, beyond the formal qualification levels of individual practitioners. The article argues for a critical and systemic reconceptualisation of professional practice in a competent system. 相似文献
66.
van Lier PA Vitaro F Barker ED Brendgen M Tremblay RE Boivin M 《Child development》2012,83(5):1775-1788
This study explored whether early elementary school aged children’s externalizing problems impede academic functioning and foster negative social experiences such as peer victimization, thereby making these children vulnerable for developing internalizing problems and possibly increasing their externalizing problems. It also explored whether early internalizing problems contributed to an increase in externalizing problems. The study examined 1,558 Canadian children from ages 6 to 8 years. Externalizing and internalizing problems, peer victimization, and school achievement were assessed annually. Externalizing problems lead to academic underachievement and experiences of peer victimization. Academic underachievement and peer victimization, in turn, predicted increases in internalizing problems and in externalizing problems. These pathways applied equally to boys and girls. No links from internalizing to externalizing problems were found. 相似文献
67.
68.
E.B. Ogle Stuart McFadyen Shirley Serafini Michel Andrieu 《Communication Booknotes Quarterly》2013,44(9)
E.B. Ogle, Long Distance Please: The Story of the TransCanada Telephone System (Toronto: Collins, 1979—$14.95) Stuart McFadyen, et al., Canadian Broadcasting: Market Structure and Economic Performance (Montreal: Institute for Research on Public Policy/available in U.S. from Renouf, Old Post Rd., Brookfield, Vt. 05036—$15.95, paper) The Information Revolution and its Implications for Canada by Shirley Serafini and Michel Andrieu (November 1980, 113 pp. —$4.95, paper) Telecommunications and Canada: Consultative Committee on the Implications of Telecommunications for Canadian Sovereignty (March 1979, 98 pp.—$6.00, paper) The 1980s: A Decade of Diversity–Broadcasting, Satellites, and Pay-TV (.July 1980, 94 pp.—$3.95, paper) Attitudes of Canadians Toward Advertising on Television (1978, 55 pp.—$2.00, paper) 相似文献
69.
Abstract The music business is facing hard times with declining CD sales and increasing piracy. Whereas the economic downturn is one reason for lower sales, the industry has decided to target the second factor, the fast diffusion of technologies such as CD burners and peer‐to‐peer networks like KaZaA allowing massive illegal distribution of music. Some labels focused on an offensive strategy to promote their artists. New services are being added to so called Enhanced CDs that create a new user experience. These CDs offer bonus content (i.e. videos, additional songs, pictures, or lyrics) stored directly on the CD that can be accessed on the PC. Other CDs offer (additionally) online access to actual bonus content or services (i.e. tour dates or news) if the CD is entered in the FC. The impact of these services on consumer experience has not yet been researched in depth and it remains unclear if consumers actually use the offered services on Enhanced CDs. The music label Arista has introduced several new albums on Enhanced CDs to the market providing more value to the user instead of reducing the utility by focusing only on copy protection. This article analyzes the usage of such services provided by Arista and focuses on Santana's new album “Shaman”;. Using a unique data set provided byfavakitty Media (Bandlirik) and Arista, we show for the first time what services are actually used by Santana fans and compare the results to albums of other artists such as TIC or Toni Braxton. Our results indicate that Enhanced CDs are used frequently by a relatively small group of fans, providing more value to the customer and creating a stronger relation between fans and artists. 相似文献
70.
Michael Pfau Ph.D. Michel M. Haigh Ph.D. Theresa Shannon Toni Tones Deborah Mercurio Raina Williams 《广播与电子媒介杂志》2013,57(2):303-322
Results of an experiment about the influence of network television news coverage of combat in Iraq on viewers indicated that, compared with a control condition which featured news stories about combat operations in Iraq described by news anchors, news reports also featuring footage of combat operations increased viewer involvement levels about the war and reduced viewer support for continued military presence in Iraq. Television news footage of combat operations also reduced viewers' pride in U.S. military presence but did not affect other emotions. However, regardless of how news stories were packaged, women experienced greater emotional response to network news stories about combat operations than men. The results also shed light on the potential of inoculation to deflect such influence. 相似文献