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   1747篇
  免费   31篇
  国内免费   1篇
教育   1250篇
科学研究   162篇
各国文化   39篇
体育   87篇
综合类   4篇
文化理论   14篇
信息传播   223篇
  2024年   5篇
  2023年   16篇
  2022年   16篇
  2021年   43篇
  2020年   57篇
  2019年   88篇
  2018年   114篇
  2017年   122篇
  2016年   107篇
  2015年   81篇
  2014年   103篇
  2013年   356篇
  2012年   78篇
  2011年   91篇
  2010年   63篇
  2009年   68篇
  2008年   47篇
  2007年   48篇
  2006年   54篇
  2005年   18篇
  2004年   31篇
  2003年   31篇
  2002年   25篇
  2001年   14篇
  2000年   14篇
  1999年   14篇
  1998年   9篇
  1997年   6篇
  1996年   4篇
  1995年   7篇
  1994年   4篇
  1993年   2篇
  1992年   5篇
  1991年   6篇
  1990年   3篇
  1989年   3篇
  1988年   1篇
  1987年   3篇
  1986年   1篇
  1985年   5篇
  1984年   4篇
  1983年   2篇
  1982年   1篇
  1980年   2篇
  1979年   1篇
  1978年   1篇
  1977年   3篇
  1975年   1篇
  1974年   1篇
排序方式: 共有1779条查询结果,搜索用时 15 毫秒
81.
Applying the Theory of Planned Behavior (TPB), this study examines parents’ attitudes, social norms, self-efficacy, and intentions regarding parental mediation of children’s smartphone use. A survey conducted with parents of young smartphone users aged 10–17 shows that parents tend to perceive discussion-based active mediation to be more desirable, as compared to rule-making restrictive mediation. Findings also indicate that the extent to which parents believe that they have control over their parental mediation practices plays an important role in forming positive intentions to practice parental mediation, regardless of the mediation domain.  相似文献   
82.

Objective  

In order to overcome the defects of chemical hydrolysis approach to prepare glucosamine, an enzymatic hydrolysis method was developed.  相似文献   
83.
As soft news shows in television present politics in an entertaining format, they are likely to attract and grab the attention of people who do not have a high interest in politics. Consequently, soft news might mobilize these citizens to engage in politics. This study tests this potential by using a 2-wave panel survey among a national sample of voters (N = 2,680) collected in relation to the 2015 National Election in Denmark. The results show that people with lower political interest were indeed more likely to increase their use of soft news during the election campaign and that, as a consequence, these low-motivated people also increased their passive participation, such as seeking additional information about the election. Further, the results show that this type of passive participation is likely to function as a stepping-stone to active forms of participation, such as attending political events or contacting politicians.  相似文献   
84.
The studies pertaining to expertise development are diverse and broad (Bjork, 1994; Einstein & McDaniel, 2005; Schneider, Healy, & Bourne, 2002), yet empirical research that bridges expertise development into instructional design theories is still in its very formative stages (Ertmer et al., 2008; Fadde, 2009). This article is intended to identify the instructional principles that are effective in accelerating the performance of journeymen, considering the significant impact of the journeyman stage and the need for hastening performance in that stage. With the introduction to the major scholarly works and principles that have led to the elaboration of training methods, strategies, and materials, this review of literature proposes a learning model that has four components: (1) development plan, (2) action, (3) reflection‐on‐action, and (4) remedies.  相似文献   
85.
86.
This study examined the actual practice and effectiveness of a satellite educational TV program in Ethiopian secondary schools. Participants in the survey were 228 students and 63 teachers from secondary schools. The results of the data analysis indicate that Ethiopian students and teachers scored highly in the evaluation areas. Levels of students’ general satisfaction with the satellite educational TV program were not equal for the variables of location and gender. It was also found that for students, learning demand, learning content, and class management were factors affecting their satisfaction with the satellite educational TV programs. For teachers, learning content and class management were the factors. The statistical mean difference in the satisfaction with the satellite educational TV program was between students and teachers. These findings suggest that the satellite educational TV program has the possibility of improving the quality of education in Ethiopian secondary schools.  相似文献   
87.
88.
89.
This study explores the impact of governmental support policies on the innovation of SMEs in the regional strategic industries in South Korea. We use the technological development assistance funds as a proxy for governmental support policies for SMEs in the regional industries in Korea. The innovation of SMEs is measured by technological innovation: patent, utility model, trademark, and new design registrations. Before empirically testing the impact of governmental support policies on the innovation of SMEs, this study reviews the literature concerning the innovation and the governmental support policies of SMEs in regional industries. Results from empirical models, which simultaneously control for factors which were thought to affect the innovation of regional SMEs, indicate that a positive relationship exists among the technological development assistance by the Korean government and patent acquisitions and new design registrations of regional SMEs. Networks with universities also have a positive relationship with patent acquisitions and new design registrations of regional SMEs. This study suggests there is an importance to governmental financial aids for regional SME innovations, and there is an importance to the need to build a strong social relationship in today's networked economy.  相似文献   
90.
This paper reports a method to control the fluid flow in paper-based microfluidic devices simply by pressing over the channel surface of paper, thereby decreasing the pore size and permeability of a non-woven polypropylene sheet. As a result, fluid resistance is increased in the pressed region and causes flow rate to decrease. We characterize the decrease of flow rate with respect to different amounts of pressure applied, and up to 740% decrease in flow velocity was achieved. In addition, we demonstrate flow rate control in a Y-shaped merging paper and sequential delivery of multiple color dyes in a three-branched paper. Furthermore, sequential delivery of multiple fluid samples is performed to demonstrate its application in multi-step colorimetric immunoassay, which shows a 4.3-fold signal increase via enhancement step.  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