全文获取类型
收费全文 | 786篇 |
免费 | 18篇 |
国内免费 | 2篇 |
专业分类
教育 | 454篇 |
科学研究 | 66篇 |
各国文化 | 33篇 |
体育 | 136篇 |
文化理论 | 7篇 |
信息传播 | 110篇 |
出版年
2023年 | 10篇 |
2022年 | 8篇 |
2021年 | 14篇 |
2020年 | 29篇 |
2019年 | 47篇 |
2018年 | 48篇 |
2017年 | 51篇 |
2016年 | 49篇 |
2015年 | 24篇 |
2014年 | 21篇 |
2013年 | 153篇 |
2012年 | 20篇 |
2011年 | 22篇 |
2010年 | 18篇 |
2009年 | 15篇 |
2008年 | 15篇 |
2007年 | 20篇 |
2006年 | 22篇 |
2005年 | 22篇 |
2004年 | 7篇 |
2003年 | 9篇 |
2002年 | 12篇 |
2001年 | 5篇 |
2000年 | 10篇 |
1999年 | 5篇 |
1998年 | 6篇 |
1997年 | 5篇 |
1996年 | 8篇 |
1995年 | 10篇 |
1994年 | 5篇 |
1993年 | 8篇 |
1992年 | 4篇 |
1991年 | 7篇 |
1990年 | 9篇 |
1989年 | 4篇 |
1988年 | 3篇 |
1987年 | 3篇 |
1986年 | 6篇 |
1984年 | 3篇 |
1982年 | 3篇 |
1981年 | 5篇 |
1978年 | 9篇 |
1977年 | 4篇 |
1976年 | 5篇 |
1975年 | 6篇 |
1972年 | 3篇 |
1969年 | 3篇 |
1968年 | 3篇 |
1964年 | 4篇 |
1957年 | 3篇 |
排序方式: 共有806条查询结果,搜索用时 0 毫秒
21.
David R. Lubans Philip Morgan Robin Callister Ronald C. Plotnikoff Narelle Eather Nicholas Riley 《Journal of sports sciences》2013,31(7):685-693
Abstract The main aim of this study was to determine the test–retest reliability of existing tests of health-related fitness. Participants (mean age 14.8 years, s = 0.4) were 42 boys and 26 girls who completed the study assessments on two occasions separated by one week. The following tests were conducted: bioelectrical impedance analysis (BIA) to calculate percent body fat, leg dynamometer, 90° push-up, 7-stage sit-up, and wall squat tests. Intra-class correlation (ICC), paired samples t-tests, and typical error expressed as a coefficient of variation were calculated. The mean percent body fat intra-class correlation coefficient was similar for boys (ICC = 0.95) and girls (ICC = 0.93), but the mean coefficient of variation was considerably higher for boys than girls (22.2% vs. 12.2%). The boys' coefficients of variation for the tests of muscular fitness ranged from 9.0% for the leg dynamometer test to 26.5% for the timed wall squat test. The girls' coefficients of variation ranged from 17.1% for the sit-up test to 21.4% for the push-up test. Although the BIA machine produced reliable estimates of percent body fat, the tests of muscular fitness resulted in high systematic error, suggesting that these measures may require an extensive familiarization phase before the results can be considered reliable. 相似文献
22.
Abstract The aim of this study was to quantify the changes in locomotive rates across the duration of senior elite rugby league matches. A semi-automated image recognition system (ProZone 3, ProZone®, Leeds, England) was used to track the movements of 59 players from six teams during three competitive matches. The players were classified into one of four positional groups: props (n = 9), back row (n = 9), pivots (n = 14) or outside backs (n = 27). Players' movements were classified as low, high or very high intensity running and reported as locomotive rates (distance covered per minute played) for successive quarters of each match. Analysis of variance revealed that only the outside backs showed a significantly lower overall locomotive rate during the final quarter compared to the first (P < 0.05). However, locomotive rates for high and very high intensity running during the final quarter were significantly lower (P < 0.05) than the first quarter among outside backs, pivots and props despite no change in the rate of involvements in contact. On the basis of these findings, it is suggested that high and very high intensity running locomotive rates may be more affective methods of detecting fatigue during competitive matches than overall locomotive rate. 相似文献
23.
S.J. McGregor C.W. Nicholas H.K.A. Lakomy C. Williams 《Journal of sports sciences》2013,31(11):895-903
The aim of this study was to examine the effect of intermittent high-intensity shuttle running and fluid ingestion on the performance of a soccer skill. Nine semi-professional soccer players volunteered to participate in the study. Their mean (± sx ) age, body mass and maximal oxygen uptake were 20.2 ± 0.4 years, 73.2 ± 1.8 kg and 59.1 ± 1.3 ml·kg-1 ·min-1 respectively. The players were allocated to two randomly assigned trials: ingesting or abstaining from fluid intake during a 90 min intermittent exercise protocol (Loughborough Intermittent Shuttle Test:LIST).This test was designed to simulate the minimum physical demands faced by soccer players during a game. Before and immediately after performance of the test,the players completed a soccer skill test and a mental concentration test. Performance of the soccer skill test after the 'no-fluid' trial deteriorated by 5% (P ? 0.05),but was maintained during the fluid trial. Mean heart rate, perceived exertion, serum aldosterone, osmolality, sodium and cortisol responses during the test were higher (P ? 0.05) in the 'no-fluid' trial than in the fluid trial. The results of this study suggest that soccer players should consume fluid throughout a game to help prevent a deterioration in skill performance. 相似文献
24.
Over the next decade, Baby Boomers will be reaching retirement age in large numbers and the U.S. will be undergoing one of the most significant demographic shifts in its history. This demographic shift has important implications for the role of higher education as a provider of lifelong learning and for the changing composition of postsecondary institutions. Using data from the 2005 National Household Education Survey, the results of this study informs the higher education community about this emerging student market segment as a way to help us better respond to older adults?? demand for formal learning in postsecondary institutions. 相似文献
25.
David Nicholas Director of CIBER Professor at Director of the School of Library Paul Huntington Senior Researcher a founder member of CIBER SLAIS University College London WCE BT UK Hamid R. Jamali a researcher in CIBER SLAIS University College London WCE BT UK 《The Journal of Academic Librarianship》2007,33(6):629-638
The logs of four universities using the OhioLINK journal system were evaluated for a period of fifteen months using deep log analysis methods in order to compare and contrast the information seeking behaviour of their users. Large differences were found, especially between the research and teaching universities. Methodological problems associated with making the comparisons are discussed in some detail especially in terms of defining online sessions. 相似文献
26.
Metrics derived from user visits or sessions provide a means of evaluating Websites and an important insight into online information seeking behaviour, the most important of them being the duration of sessions and the number of pages viewed in a session, a possible busyness indicator. However, the identification of session (termed often ‘sessionization’) is fraught with difficulty in that there is no way of determining from a transactional log file that a user has ended their session. No one logs out. Instead a session delimiter has to be applied and this is typically done on the basis of a standard period of inactivity. To date researchers have discussed the issue of a time out delimiter in terms of a single value and if a page view time exceeds the cut-off value the session is deemed to have ended. This approach assumes that page view time is a single distribution and that the cut-off value is one point on that distribution. The authors however argue that page time distribution is composed of a number of quite separate view time distributions because of the marked differences in view times between pages (abstract, contents page, full text). This implies that a number of timeout delimiters should be applied. Employing data from a study of the OhioLINK digital journal library, the authors demonstrate how the setting of a time out delimiter impacts on the estimate of page view time and the number of estimated session. Furthermore, they also show how a number of timeout delimiters might apply and they argue that this gives a better and more robust estimate of the number of sessions, session time and page view time compared to an application of a single timeout delimiter. 相似文献
27.
28.
Nicholas Houghton 《The International Journal of Art & Design Education》2016,35(1):107-120
This article reports historical research which sought to understand the present‐day post‐secondary art curriculum through analysing its history in terms of changes in conceptions of art. It found that there have been six distinctive curricula: Apprentice, Academic, Formalist, Expressive, Conceptual and Professional. As a new curriculum has been introduced, it has co‐existed with much contained in a previous one. Most of the curriculum changes have taken place in the past 65 years. During this time, there has been a massive expansion in the education of artists and at the same time art schools accommodated first modernism and then post‐Duchampian aesthetics. A conclusion is that this has made for a very crowded curriculum. Moreover, despite there being an ever increasing choice of things a student might learn, it appears that there is nothing which all students have to learn. It can be problematic that one part of the curriculum is in contradiction to another part, and moreover this lack of a core raises fundamental, ontological questions about what art as a discipline is. 相似文献
29.
Inger Andersen Naoko Ishii Thomas Brooks Cynthia Cummis Gustavo Fonseca Astrid Hillers Nicholas Macfarlane Nebojsa Nakicenovic Kevin Moss Johan Rockstr?m Andrew Steer Dominic Waughray Caroline Zimm 《国家科学评论(英文版)》2021,(7):12-15
The 2015 Paris Agreement to keep global warming well below 2℃above pre-industrial levels and aim towards limiting warming to 1.5℃marked a wa-tershed in planetar... 相似文献
30.