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   1048篇
  免费   28篇
  国内免费   2篇
教育   823篇
科学研究   64篇
各国文化   23篇
体育   78篇
文化理论   7篇
信息传播   83篇
  2023年   7篇
  2022年   4篇
  2021年   16篇
  2020年   25篇
  2019年   33篇
  2018年   45篇
  2017年   48篇
  2016年   57篇
  2015年   25篇
  2014年   46篇
  2013年   251篇
  2012年   26篇
  2011年   40篇
  2010年   30篇
  2009年   32篇
  2008年   29篇
  2007年   32篇
  2006年   21篇
  2005年   23篇
  2004年   24篇
  2003年   16篇
  2002年   19篇
  2001年   13篇
  2000年   14篇
  1999年   11篇
  1998年   9篇
  1997年   10篇
  1996年   11篇
  1995年   8篇
  1994年   14篇
  1993年   9篇
  1992年   7篇
  1991年   7篇
  1990年   5篇
  1989年   8篇
  1988年   7篇
  1987年   7篇
  1986年   9篇
  1985年   6篇
  1984年   5篇
  1982年   8篇
  1981年   4篇
  1980年   6篇
  1979年   6篇
  1978年   4篇
  1977年   5篇
  1976年   7篇
  1973年   4篇
  1972年   4篇
  1967年   3篇
排序方式: 共有1078条查询结果,搜索用时 15 毫秒
991.
992.
993.
994.
Recently our group has reported experiments using an obstacle array to precondition the conformations of DNA molecules to facilitate their stretch in a microcontraction. Based upon previous successes simulating electrophoretic stretching in microcontractions without obstacles, we use our simulation model to study the deformation of DNA chains in a microcontraction preceded by an array of cylindrical obstacles. We compare our data to the experimental results and find good qualitative, and even quantitative, agreement concerning the behavior of the chains in the array; however, the simulations overpredict the mean stretch of the chains as they leave the contraction. We examine the amount of stretch gained between leaving the array and reaching the end of the contraction and speculate that the differences seen are caused by nonlinear electrokinetic effects that become important in the contraction due to a combination of field gradients and high field strengths.  相似文献   
995.
996.
997.
998.
美国湿地保护制度变迁研究   总被引:1,自引:0,他引:1  
本文提出了分析湿地保护制度变迁的理论框架,使不同国家的湿地保护制度研究能在统一语境下比较。首先基于科学计量学和系统研究方法筛选出公众、科学、政府和法律为影响湿地保护制度变迁的四个关键要素,并依赖博弈论工具建立了分析美国湿地保护制度的理论架构。基于这一架构,本文对包括关键利益相关者、政策执行路径、政策工具和管理挑战等内容的美国湿地政策史进行了讨论。对美国湿地保护制度的演化进行了四阶断之划分:“西进运动”与全民开垦(1900年之前)、“水鸟保护”与公众参与(1900-1970年)、核心法律与科学研究(1971-1980年)和完善制度与新的挑战(1980年至今)。分析得出如下结论:在湿地保护制度中,公众是源头、科学是前提、有效的政府管治和将湿地保护的规则和与政策制度化是关键。通过借鉴美国湿地保护制度变迁研究,本文构建了湿地保护制度变迁的“竹节模式”经验性模型,揭示了各动因之间的作用机理。虽然美国湿地保护制度也面临着公众教育、科学定义和政府管辖权等挑战,但中国的湿地管理者与政策制定者仍可从美国湿地政策执行的历史背景中吸取经验。同时本文的理论分析结构也可为自然资源及管理策略的研究提供参考。  相似文献   
999.
The prominence afforded to literacy in the Irish Primary School Curriculum has received considerable attention in recent years, spurred by Programme for International Student Assessment (PISA) rankings, governmental priorities, public commentary and academic debate. At times, this discourse has presented literacy as a separate and distinct entity to the other areas of the curriculum, including the arts, social and scientific education. The current paper proposes a more integrated view of literacy’s role in the curriculum. Recent research on the teaching of literacy in the content areas has emphasised the potential of a disciplinary approach, which embraces the key skills, dispositions and forms of knowledge connected with reading, writing, speaking and listening in different disciplines. This paper examines some of the key features of disciplinary literacy, including its underpinning rationale and learning implications. It also highlights the potential for a disciplinary literacy lens in the review of the Primary School Curriculum, as well as associated opportunities and challenges.  相似文献   
1000.
We used a comparative interrupted time series design to examine the impact of the Massachusetts' Wraparound Zone Initiative on student achievement, attendance, retention, and suspension. This initiative was designed to create coordinated district systems that allow schools to proactively and systematically address students' nonacademic needs. The state education agency awarded grants to seven high-need districts, each of which used the funds to support a select group of schools in implementing strategies that focused on school climate and culture, family engagement, systems to identify and address student needs, and community partnerships. Results from this study showed that students in Wraparound Zone schools performed better on state academic assessments than students in comparison schools, when considering prior achievement trends. Effects were statistically significant in the 3rd year of implementation. The impact on academic achievement was greatest for third- and fourth-grade students, and was particularly strong for English learners. There was no statistically significant overall impact on attendance, retention, or suspension.  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