全文获取类型
收费全文 | 2155篇 |
免费 | 34篇 |
国内免费 | 4篇 |
专业分类
教育 | 1573篇 |
科学研究 | 264篇 |
各国文化 | 25篇 |
体育 | 103篇 |
综合类 | 1篇 |
文化理论 | 34篇 |
信息传播 | 193篇 |
出版年
2021年 | 20篇 |
2020年 | 29篇 |
2019年 | 48篇 |
2018年 | 67篇 |
2017年 | 55篇 |
2016年 | 53篇 |
2015年 | 36篇 |
2014年 | 41篇 |
2013年 | 575篇 |
2012年 | 44篇 |
2011年 | 43篇 |
2010年 | 35篇 |
2009年 | 26篇 |
2008年 | 46篇 |
2007年 | 26篇 |
2006年 | 34篇 |
2005年 | 29篇 |
2004年 | 34篇 |
2003年 | 32篇 |
2002年 | 37篇 |
2001年 | 18篇 |
2000年 | 24篇 |
1999年 | 27篇 |
1998年 | 18篇 |
1997年 | 22篇 |
1996年 | 24篇 |
1995年 | 18篇 |
1994年 | 13篇 |
1993年 | 23篇 |
1992年 | 21篇 |
1991年 | 17篇 |
1990年 | 19篇 |
1989年 | 22篇 |
1988年 | 15篇 |
1987年 | 27篇 |
1986年 | 17篇 |
1984年 | 18篇 |
1983年 | 18篇 |
1982年 | 19篇 |
1981年 | 21篇 |
1980年 | 22篇 |
1979年 | 20篇 |
1978年 | 21篇 |
1976年 | 14篇 |
1974年 | 16篇 |
1972年 | 14篇 |
1971年 | 16篇 |
1968年 | 14篇 |
1967年 | 16篇 |
1966年 | 16篇 |
排序方式: 共有2193条查询结果,搜索用时 15 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.
An effect size of about .70 (or .40–.70) is often claimed for the efficacy of formative assessment, but is not supported by the existing research base. More than 300 studies that appeared to address the efficacy of formative assessment in grades K‐12 were reviewed. Many of the studies had severely flawed research designs yielding uninterpretable results. Only 13 of the studies provided sufficient information to calculate relevant effect sizes. A total of 42 independent effect sizes were available. The median observed effect size was .25. Using a random effects model, a weighted mean effect size of .20 was calculated. Moderator analyses suggested that formative assessment might be more effective in English language arts (ELA) than in mathematics or science, with estimated effect sizes of .32, .17, and .09, respectively. Two types of implementation of formative assessment, one based on professional development and the other on the use of computer‐based formative systems, appeared to be more effective than other approaches, yielding mean effect size of .30 and .28, respectively. Given the wide use and potential efficacy of good formative assessment practices, the paucity of the current research base is problematic. A call for more high‐quality studies is issued. 相似文献
9.
Mary Nash 《Higher Education Quarterly》2011,65(3):308-324
In 1963, the University of Sussex inaugurated an innovative Early Leavers Scheme in response to two government reports which confirmed that it was still the norm for talented working‐class children to leave school aged 15 or 16 and indicated that the hopes of the 1944 Education Act were as yet unfulfilled. This article explores what the scheme has meant to some of the people who got to university because of it. Research on relevant documentation of the scheme and its outcomes held in the University of Sussex archives and information gathered from four people admitted to the scheme and its impact on them inform this article. The scheme is contextualised with relevant policy documents, government reports and academic publications to provide a framework for the accounts of those who took part in it and it is tentatively suggested that these have implications for higher education policy today. 相似文献
10.