全文获取类型
收费全文 | 13372篇 |
免费 | 144篇 |
国内免费 | 14篇 |
专业分类
教育 | 8771篇 |
科学研究 | 2227篇 |
各国文化 | 136篇 |
体育 | 1024篇 |
综合类 | 6篇 |
文化理论 | 99篇 |
信息传播 | 1267篇 |
出版年
2021年 | 113篇 |
2020年 | 177篇 |
2019年 | 276篇 |
2018年 | 363篇 |
2017年 | 346篇 |
2016年 | 283篇 |
2015年 | 201篇 |
2014年 | 277篇 |
2013年 | 2440篇 |
2012年 | 289篇 |
2011年 | 268篇 |
2010年 | 236篇 |
2009年 | 229篇 |
2008年 | 244篇 |
2007年 | 233篇 |
2006年 | 205篇 |
2005年 | 201篇 |
2004年 | 178篇 |
2003年 | 192篇 |
2002年 | 189篇 |
2001年 | 209篇 |
2000年 | 203篇 |
1999年 | 187篇 |
1998年 | 103篇 |
1997年 | 125篇 |
1996年 | 146篇 |
1995年 | 112篇 |
1994年 | 112篇 |
1993年 | 112篇 |
1992年 | 152篇 |
1991年 | 170篇 |
1990年 | 162篇 |
1989年 | 187篇 |
1988年 | 134篇 |
1987年 | 128篇 |
1986年 | 179篇 |
1985年 | 168篇 |
1984年 | 142篇 |
1983年 | 146篇 |
1982年 | 138篇 |
1981年 | 109篇 |
1980年 | 110篇 |
1979年 | 160篇 |
1978年 | 128篇 |
1977年 | 117篇 |
1976年 | 112篇 |
1974年 | 117篇 |
1973年 | 95篇 |
1972年 | 88篇 |
1971年 | 110篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
993.
We investigated the effects of hand paddles and parachute on the relative duration of stroke phases and index of coordination of competitive crawl-strokers. Eleven male-swimmers (age: 21.9 ± 4.5 years; 50-m best time: 24.23 ± 0.75 s) were evaluated in four maximal-intensity conditions: without equipment, with hand paddles, with parachute, and with both hand paddles and parachute. Relative stroke phase duration of each arm, swimming velocity, and stroke rate were analysed from video (60 Hz). The index of coordination was quantified based on the lag time between propulsive phases of each arm, which defined the coordination mode as catch-up, opposition or superposition. The stroke rate decreased in all conditions (P < 0.05) and swimming velocity decreased with parachute and with paddles + parachutes (P < 0.05). The coordination mode changed from catch-up in free swimming (-2.3 ± 5.0%) to opposition with paddles (-0.2 ± 3.8%), parachute (0.1 ± 3.1%), and paddles + parachute (0.0 ± 3.2%). Despite these variations, no significant differences were observed in relative duration of right and left arm-stroke phases, or in index of coordination. We conclude that the external resistances analysed do not significantly influence stroke phase organization, but, as a chronic effect, may lead to greater propulsive continuity. 相似文献
994.
Souvik Ghosh H.N. Verma Dinesh Chandra P. Nanda 《The Journal of Agricultural Education and Extension》2013,19(1-4):17-26
The key to agricultural development in the eastern region of India, where problems of excess water and water scarcity coexist, is the scientific management of water resources with the adoption of recommended water-management technologies. A vast networking of infrastructure for the development and dissemination of water- management technologies have been designed since the very inception of planned economic change. Despite these concerted efforts, a large number of recommended technologies are either being adopted in piece-meal or not at all. The research and extension systems have been generating and disseminating technologies, therefore, it was felt worthwhile to assess the feasibility and appropriateness of recommended tecnologies as perceived in the first instance by the personnel of the research system and followed by the extension personnel. These steps were felt to be a precursor to screen the recommended technologies for their dissemination and evaluation in different farming systems. The assessment of recommended water-management technologies was performed after their documentation from different organisations working in the field of water management in two eastern India states viz. Orissa and West Bengal. The perception of 30 personnel members of the research system regarding the feasibility of these technologies elucidated that out of 86 documented recommended water-management technologies, 40 were having feasibility scores of ≥ 4.0; 8 technologies with score £ 3.0 and the rest of the 38 technologies with a score between 3.0 and 4.0 on a feasibility continuum range from 1.0 (not feasible) to 5.0 (highly feasible). Out of 40 recommended technologies (already assessed as highly feasible by the research personnel), extension personnel have perceived 16 and 10 technologies as highly appropriate and feasible, respectively. While six and four technologies were found to be less appropriate and feasible, respectively. Correlation of all nine indicators of appropriateness with feasibility of technologies was significant. Five indicators of appropriateness viz. simplicity, physical compatibility, production sustainability, cultural compatibility and cost together constituted 36.8 per cent of the total variation in feasibility with the ‘t’ values and ‘F’ values being significant. It indicates that not appropriateness of technologies alone but other factors influence the feasibility of technologies. 相似文献
995.
This paper introduces an interactive e-learning system that provides an integrated environment for web programming. The proposed system is web-based. It provides an online editor for writing, editing, updating, and executing programming code, so the learners can execute examples and practical exercises online. In addition, it provides auto complete and syntax highlighting in editing code, which could help learners to remember the syntax more easily. The proposed system provides communication and interactive tools including Chat-Room, E-Mail, and Discussion Board (Forum) among learners and instructors. Moreover, it provides the instructors with an online exam system. It monitors, collects and keeps information about learners’ performance and activities. Therefore, instructors can use the recorded information to keep tracking of the learner’s progress. The system is based on the common three-tier-architecture of web-based applications that is organized into presentation tier, logic tier, and data tier. 相似文献
996.
Jason Moran Gavin R. H. Sandercock Rodrigo Ramírez-Campillo César Meylan Jay Collison Dave A. Parry 《Journal of sports sciences》2017,35(11):1041-1051
This meta-analysis investigated the maturation-related pattern of adaptations to resistance training in boy athletes. We included studies examining the effects of 4–16-week resistance training programmes in healthy boy athletes aged 10–18 years. Pooled estimates of effect size for change in strength across all studies (n = 19) were calculated using the inverse–variance random effects model for meta-analyses. Estimates were also calculated for groups based on likely biological maturity status (“before”, “during” and “after” peak height velocity). Using the standardised mean difference, resistance training increased strength across all groups (effect size = 0.98, [CI: 0.70–1.27]). Strength gains were larger during (1.11 [0.67–1.54]) and after (1.01 [0.56–1.46]) peak height velocity than before (0.5 [?0.06–1.07]). Adaptations to resistance training are greater in adolescent boys during or after peak height velocity. These findings should help coaches to optimise the timing of training programmes that are designed to improve strength in boy athletes. 相似文献
997.
This paper reveals the complex diversity that underpins ostensibly similar transnational education programmes (TNE), through a comparison of UK TNE in Malaysia and Hong Kong. It draws on data from two different yet cognate studies on the role of UK universities in delivering higher education in Asia. Some fine-grained and informative differences between the ways in which ‘value’ in TNE is constructed in different host contexts is revealed. The paper brings to light the ‘voices’ of TNE students and graduates, which are very seldom heard. The arguments adapt and extend the concepts of education as a positional good, and as cultural capital. For various instrumental, intrinsic and personal reasons the authors discuss in detail, UK TNE is more highly valued in Malaysia than in Hong Kong. The paper makes a wider contribution to knowledge on the changing landscape of international higher education and the impact on social and personal (dis)advantage. 相似文献
998.
The Effective Teaching and Assessment Programme (ETAP) was commissioned and funded by the Higher Education Funding Councils for England, Scotland and Wales and ran during the academic year 1993–4. Its aim was to identify and disseminate best practice in specific subject areas, student support and resource based learning. ETAP supported five projects, each undertaken by a consortium of British higher education institutions. This paper reports an evaluation of the programme based on interviews with leaders of the individual projects, along with a questionnaire survey of potential users of the products of the programme. A framework is offered for interpreting the results of the evaluation. Six different meanings of the word dissemination are identified, corresponding to the different degrees to which users actively engage with the materials produced. These distinctions are applied to the data collected and the findings are summarised in terms of the key notions of awareness of what is available, the attitude of teaching staff towards centrally-produced materials, and the accessibility of those materials. The implications of these three concepts are discussed in relation to the technical, organisational and presentational issues which promote or hinder the effectiveness of the dissemination. A number of policy recommendations for Funding Councils and institutions are outlined. 相似文献
999.
Jan Håkansson 《School Leadership & Management》2016,36(3):292-310
Preschool managers’ responsibility for and leadership of systematic quality work has come to the fore in connection with changes made to the Swedish preschool curriculum. The aim of this study is to contribute to the understanding of preschool managers’ leadership and management of the systematic quality work in Swedish preschools with reference to three specific domains: (i) governance, leadership/management and organisation, (ii) content and methods and (iii) development work and collegiate learning. Using qualitative methods, 18 preschool managers’ perspectives of leading systematic quality work have been analysed in relation to previous research. The results show a tension between linear and interactive forms of governance in the systematic quality work, but also that knowledge gaps among the staff can lead to uncertainties that the preschool manager has to address. At the same time, the results show the diversity of and variation in how children’s development and increased proficiency are documented, while the documentation of the quality of the work focuses on learning environments rather than on teaching and teacher competence. In the study, there are traces of what can be characterised as leadership for learning. This needs to be investigated more closely using other methods in future research. 相似文献
1000.
Homework: a cross-cultural examination 总被引:5,自引:1,他引:5
Cultural differences in the amount of time spent on homework and in beliefs and attitudes about homework were investigated through interviews with more than 3,500 elementary school children, their mothers, and their teachers. The children lived in 5 cities: Beijing, Chicago, Minneapolis, Sendai (Japan), and Taipei. Chinese children were assigned more homework and spent more time on homework than Japanese children, who in turn were assigned more and spent more time on homework than American children. Chinese children also received more help from family members with their homework than American and Japanese children. Chinese children were found to have more positive attitudes about homework than American children; Japanese children's attitudes were between those of the Chinese and American children. Relations between amount of time spent on homework by children, amount of time parents spent assisting their children with homework, and children's achievement were also explored. The views of both parents and teachers about the value of homework are discussed. 相似文献