全文获取类型
收费全文 | 2148篇 |
免费 | 31篇 |
国内免费 | 4篇 |
专业分类
教育 | 1548篇 |
科学研究 | 267篇 |
各国文化 | 27篇 |
体育 | 115篇 |
综合类 | 1篇 |
文化理论 | 34篇 |
信息传播 | 191篇 |
出版年
2022年 | 17篇 |
2021年 | 20篇 |
2020年 | 35篇 |
2019年 | 50篇 |
2018年 | 76篇 |
2017年 | 62篇 |
2016年 | 52篇 |
2015年 | 35篇 |
2014年 | 44篇 |
2013年 | 568篇 |
2012年 | 44篇 |
2011年 | 48篇 |
2010年 | 36篇 |
2009年 | 24篇 |
2008年 | 44篇 |
2007年 | 27篇 |
2006年 | 36篇 |
2005年 | 28篇 |
2004年 | 34篇 |
2003年 | 34篇 |
2002年 | 33篇 |
2001年 | 19篇 |
2000年 | 24篇 |
1999年 | 24篇 |
1998年 | 18篇 |
1997年 | 20篇 |
1996年 | 24篇 |
1995年 | 17篇 |
1994年 | 12篇 |
1993年 | 22篇 |
1992年 | 20篇 |
1991年 | 17篇 |
1990年 | 18篇 |
1989年 | 22篇 |
1988年 | 16篇 |
1987年 | 26篇 |
1986年 | 14篇 |
1985年 | 12篇 |
1984年 | 16篇 |
1983年 | 15篇 |
1982年 | 20篇 |
1981年 | 24篇 |
1980年 | 22篇 |
1979年 | 20篇 |
1978年 | 22篇 |
1976年 | 14篇 |
1974年 | 16篇 |
1972年 | 12篇 |
1967年 | 14篇 |
1966年 | 12篇 |
排序方式: 共有2183条查询结果,搜索用时 46 毫秒
1.
2.
3.
4.
5.
Governments worldwide are increasingly using Web-based business models to enhance their service delivery. Yet the concept of the business model is unexplored within the context of e-government. Drawing upon the literature on e-commerce, we develop a taxonomy for analyzing Web-based business models for e-government. Based on a systematic survey of 59 e-government Web sites in the Netherlands, our findings indicate that most of the Web sites use the content provider or direct-to-customer business models, while only a few are using novel business models. Overall, the concept of business model is appealing and useful in the public sector. Specifically it compliments research on Web site quality by analyzing and describing Web sites using atomic e-government business models and suggesting improvements by using combinations of business models. 相似文献
6.
George Machovec 《图书馆管理杂志》2018,58(1):81-90
Academic libraries and consortia are spending the vast majority of their material budgets on digital content, including ebooks. A review of ebook preservation activities for the North American library consortia is provided along with a look at the major preservation services such as Portico, CLOCKSS and HathiTrust. Publishers and ebook aggregators are also examined to provide a broad environmental scan of the current ebook preservation activities and risks. 相似文献
7.
8.
9.
The N1 effect is an electrophysiological marker of visual specialization for print. The phonological mapping hypothesis (Maurer & McCandliss, 2007) posits that the left-lateralized effect reflects grapheme-phoneme integration. In this event-related potential study, first (age = 7.06 years, N = 32) and third-grade readers (age = 9.29 years, N = 28) were presented with pairs of pseudowords and Armenian character strings in a novel implicit same-different paradigm. To test the phonological mapping hypothesis, stimuli were presented in visual-only and audiovisual conditions. The results demonstrated that tuning for print already emerges in first grade. Moreover, the parallel presentation of auditory stimuli enhanced the N1 effect suggesting a role of orthographic-phonological mapping in the development of specialization for print. 相似文献
10.
David Alan George Poh-Ling Tan Jeffrey Frank Clewett 《Environmental Education Research》2016,22(1):62-88
Using a participatory learning approach, we report on the delivery and evaluation of a climate change and risk assessment tool to help manage water risks within the agricultural sector. Post-graduate water-professional students from a range of countries, from both developed and emerging economies were involved in using this tool. Our approach included participative learning tools – group discussion, software, and risk matrices. The materials developed met the needs of the students, allowing these students to incorporate their learning and adapt the package of materials for use in their home countries. Analysis of evaluations show that the tools and materials are particularly useful and emphasizes the need for sound learning materials and tools, funding to deliver training, and policy support to accelerate education and adoption of authentic climate change adaptation practices. The expected benefits for water professionals about climate change will be translated into improved socioeconomic and environmental outcomes if adopted. 相似文献