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   15037篇
  免费   643篇
  国内免费   210篇
教育   9289篇
科学研究   3053篇
各国文化   127篇
体育   660篇
综合类   756篇
文化理论   21篇
信息传播   1984篇
  2024年   3篇
  2023年   105篇
  2022年   391篇
  2021年   586篇
  2020年   588篇
  2019年   430篇
  2018年   246篇
  2017年   289篇
  2016年   299篇
  2015年   437篇
  2014年   1165篇
  2013年   1435篇
  2012年   1434篇
  2011年   1109篇
  2010年   792篇
  2009年   826篇
  2008年   820篇
  2007年   953篇
  2006年   1123篇
  2005年   1012篇
  2004年   507篇
  2003年   474篇
  2002年   369篇
  2001年   202篇
  2000年   85篇
  1999年   62篇
  1998年   34篇
  1997年   18篇
  1996年   35篇
  1995年   6篇
  1994年   6篇
  1993年   2篇
  1992年   10篇
  1991年   3篇
  1990年   2篇
  1989年   1篇
  1985年   5篇
  1984年   5篇
  1983年   5篇
  1982年   5篇
  1981年   3篇
  1980年   1篇
  1979年   2篇
  1978年   5篇
排序方式: 共有10000条查询结果,搜索用时 203 毫秒
1.
As one of the potential contextual factors for creativity development, children’s museum has been introduced to China from the western world in recent years, with the aim to offer a new informal educational environment to enhance children’s creativity. Based on experimental data for two groups of 4-year-old preschoolers (218 for the family mode and 202 for the preschool mode) from Beijing with an appropriately one-year long intervention (September 2017 to July 2018), this study examines the effect of regular visits to a children’s museum and other education environmental factors on young children’s creativity measured by Torrance’s Thinking Creatively in Action and Movement (TCAM) test. Results indicate that in terms of family visit, compared to the control group, the intervention that offers 18 times free tickets to visit a children’s museum significantly improved the experiment group’s originality (a sub-measure of creativity) by an additional 34.51 %. A beneficial effect of this intervention was also found in improving children’s fluency from the sample of preschool group visit (46.80 %). In addition, family education environment factors such as public preschool attendance, frequency of visits to science museums, and the degree of parents’ latitude were also found to positively affect creativity. Children’s personal features such as sex and geographic location of the family are also found to be related with children’s creativity.  相似文献   
2.
在国际化趋势的带动下,人类命运共同体的构建延伸渗透到了各个领域中。体育文化作为中西方存在明显差异的一个部分,如何在新的时代背景下打破原有区隔,树立新的定位和方向,并进一步实现融合是当前发展的关键。为此,文章采用文献资料法等,将围绕命运共同体的构建对中西方体育文化从区隔到融合展开探讨。  相似文献   
3.
高职院校视唱练耳教学追求课堂活动的生动性、教学内容的丰富性以及教学效果的实用性。笔者结合教学实践,从在系统的音乐分析中强化识谱训练、在旋律背唱中加强音高的准确性训练、在音乐旋律的听写中加强节奏训练、在多声部音乐中加强色彩性听辩训练4个方面,对高职院校视唱练耳教学进行了新的诠释,以期推进视唱练耳教学的创新发展。  相似文献   
4.
Semantic knowledge accumulates through explicit means and productive processes (e.g., analogy). These means work in concert when information explicitly acquired in separate episodes is integrated, and the integrated representation is used to self-derive new knowledge. We tested whether (a) self-derivation through memory integration extends beyond general information to science content, (b) self-derived information is retained, and (c) details of explicit learning episodes are retained. Testing was in second-grade classrooms (children 7–9 years). Children self-derived new knowledge; performance did not differ for general knowledge (Experiment 1) and science curriculum facts (Experiment 2). In Experiment 1, children retained self-derived knowledge over one week. In Experiment 2, children remembered details of the learning episodes that gave rise to self-derived knowledge; performance suggests that memory integration is dependent on explicit prompts. The findings support nomination of self-derivation through memory integration as a model for accumulation of semantic knowledge and inform the processes involved.  相似文献   
5.
Genetic variation in the angiotensin II type 1 receptor (AT1R) has an important effect on the outcome of acute coronary syndrome (ACS) initiated treatment with captopril. This study aims to investigate the impact of genetic polymorphism of AT1R (rs5186 and rs275651) on the ACS outcome in Iraqi patients treated with captopril. A total of 250 Iraqi individuals with ACS were included in this case—control study and they were divided into two study groups; Study group 1 included 125 participants who were prescribed captopril, 25 mg twice daily and study group 2 included 125 participants who received no captopril as part of their ACS treatment (control study). The AT1R gene (rs5186) CC genotype was found to be associated with ST-elevation myocardial infarction (STEMI) (Odd’s ratio (O.R) = 1.2, P = 0.7), while AC was associated with Non-ST-elevation myocardial infarction (NSTEMI) and unstable angina (UA) (O.R = 1.2, P = 0.8). AC genotype is more prone to have Percutaneous coronary intervention (PCI) after ACS attack (O.R = 1.2, P = 0.6). CC genotype had a risk to get less improvement (O.R = 1.6, P = 0.5), so might require higher doses of captopril during acute coronary insult. The AT1R gene (rs275651) AA genotype was associated with UA (O.R = 1.3, P = 0.9). AA and AT genotypes were more prone to have PCI after ACS attack (O.R = 3.9 P = 0.2, O.R = 3.5, P = 0.3 respectively) and thus requiring higher doses of captopril. We conclude that the AT1R rs5186, rs275651 genetic polymorphisms might partially affect the clinical outcome of ACS patients treated with captopril and might have captopril resistance which requires higher doses.  相似文献   
6.
本文通过在CNKI数据库中搜索了来源期刊为《科技管理研究》(2003-2016.9)的相关文献,运用科学计量分析方法,对其现状和研究热点进行了分析。研究发现,技术创新、影响因素、知识产权、产业集聚、指标体系、科技创新等都是近年来研究的热门话题。  相似文献   
7.
基于供应链集成化管理理论与军民融合供应链理论,界定了军民融合供应链集成化管理的概念,构建了以管理集成为核心,要素集成和职能集成为支撑的军民融合供应链集成化管理概念模型,详细分析了管理集成、要素集成和职能集成的内涵,探讨了实施军民融合供应链管理的核心、基础和重点,为实施军民融合供应链集成化管理提供一定的实践指导。  相似文献   
8.
冯泽  陈凯华  戴小勇 《科研管理》2019,40(10):73-86
现有关税收优惠政策对企业创新活动影响的文献缺乏从整个创新链的全角度揭示税收优惠政策是否真正提高企业创新能力的探索。基于中关村科技型企业数据,本文选取税收优惠政策中典型的政策工具“研发费用加计扣除”作为研究对象,有别于已有主要从“投入”视角关注研发费用加计扣除引导作用的研究,从“投入-产出-收益”的创新链全视角,将创新过程分为技术研发阶段与技术转化阶段,以揭示研发费用加计扣除政策是否真的提升了企业创新能力。基于PSM-DID方法的实证研究结果发现:在投入端,研发费用加计扣除政策显著提高了企业的研发投入规模与强度;在产出端,研发费用加计扣除政策仅促进了研发产出规模的提升,而对于产出强度则无显著影响;在收益端,研发费用加计扣除对收益规模与强度同样有显著的促进作用。本文的发现肯定了我国研发费用加计扣除政策的引导作用,以及其在企业创新能力提升中发挥的积极作用。本文的研究思路为揭示政府创新激励政策的效果提供了新视角,研究发现为从创新链与企业创新能力的角度思考和改善政府研发税收优惠政策的管理和实施提供了新证据。  相似文献   
9.
外部网络关系对企业双元创新的影响结果存在较大争议,企业维持何种状态的外部网络关系会促进双元创新,影响机理中知识吸收能力起到怎样的作用,这是亟需研究的问题。对387家企业为样本进行问卷调查,运用结构方程模型法,以知识获取能力和知识实现能力为双重中介,探析外部网络关系对企业双元创新的影响。研究结果表明:外部网络关系不同维度对双元创新具有差异化影响;网络关系强度和网络关系密度的提高以及网络关系深度的适度降低有利于渐进性创新,网络关系深度和网络关系密度的提高以及网络关系强度的适度降低更有利于突破性创新;知识吸收能力在外部网络关系对双元创新的影响中发挥部分中介作用。  相似文献   
10.
With greater access to computational resources, people use search to address many everyday challenges in their lives, including solving technology problems. Although there are now many useful ‘how-to’ resources online (especially videos on YouTube), it can still be difficult to identify, understand, and resolve certain kinds of technical problem. While research tasks have been studied for many years and we know the tactics people use, we know far less about searchers’ tactics for how-to technical tasks that involve actually being able to apply found information to resolve a problem. Crucial to our study was developing and studying a highly realistic, how-to technical task, for which there was no single guidance resource: making a phone safe for a child. After providing 39 participants with an actual phone to fix, and a search engine to perform the task, we analysed their search tactics using retrospective cued think aloud interviews. Our primary contribution is a set of 77 tactics used, in three categories, along with detail of how common they were. We conclude that people had a lot of tactics in their repertoire. Although it was not hard for participants to find relevant information, what was hard was for participants to find information they could use; indeed only 23% of participants successfully completed the entire task. Domain knowledge affected the choice of tactics used (although not necessarily towards better task success). We discuss these influences and make design recommendations for how future search systems can support those in resolving how-to technical tasks.  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