全文获取类型
收费全文 | 25155篇 |
免费 | 410篇 |
国内免费 | 19篇 |
专业分类
教育 | 18028篇 |
科学研究 | 2138篇 |
各国文化 | 276篇 |
体育 | 2114篇 |
综合类 | 14篇 |
文化理论 | 198篇 |
信息传播 | 2816篇 |
出版年
2022年 | 196篇 |
2021年 | 278篇 |
2020年 | 420篇 |
2019年 | 660篇 |
2018年 | 916篇 |
2017年 | 897篇 |
2016年 | 777篇 |
2015年 | 475篇 |
2014年 | 738篇 |
2013年 | 4923篇 |
2012年 | 706篇 |
2011年 | 708篇 |
2010年 | 527篇 |
2009年 | 544篇 |
2008年 | 614篇 |
2007年 | 532篇 |
2006年 | 488篇 |
2005年 | 465篇 |
2004年 | 410篇 |
2003年 | 412篇 |
2002年 | 400篇 |
2001年 | 517篇 |
2000年 | 422篇 |
1999年 | 392篇 |
1998年 | 223篇 |
1997年 | 245篇 |
1996年 | 271篇 |
1995年 | 265篇 |
1994年 | 198篇 |
1993年 | 219篇 |
1992年 | 341篇 |
1991年 | 326篇 |
1990年 | 314篇 |
1989年 | 322篇 |
1988年 | 270篇 |
1987年 | 314篇 |
1986年 | 288篇 |
1985年 | 320篇 |
1984年 | 259篇 |
1983年 | 232篇 |
1982年 | 217篇 |
1981年 | 180篇 |
1980年 | 161篇 |
1979年 | 279篇 |
1978年 | 192篇 |
1977年 | 180篇 |
1976年 | 164篇 |
1975年 | 144篇 |
1974年 | 155篇 |
1971年 | 144篇 |
排序方式: 共有10000条查询结果,搜索用时 8 毫秒
81.
Wondwossen M. Beyene 《Journal of Web Librarianship》2018,12(2):121-140
Digital inclusion is a strategy pursued to foster social inclusion of those who have been sidelined from the mainstream of information society due to lack of access to digital technologies and the skills to use them. Libraries have been working to close the gap by providing access to computers, the Internet, digital content, and digital literacy programs. However, research reveals a new type of divide where digitally competent people could be digitally excluded. This shows the need for a better conceptualization of access and literacy. This paper commits to exploring the concept of access to digital content from the perspective of people with print disability. It involved in-depth interviews with ten participants with print disability where the International Classification of Functioning, Disability, and Health was used as a framework for data analysis. The overall analysis shows that digital inclusion would be more meaningful if it involved providing content in alternative formats and empowering users to make informed choices. Issues such as flexibility and adaptability in content presentation and design of content discovery tools are among those discussed. 相似文献
82.
Yanyao Hu Ling Fan Apparao M Rao Weijian Yu Caixiang Zhuoma Yanhong Feng Zhihui Qin Jiang Zhou Bingan Lu 《国家科学评论(英文版)》2022,9(10)
Electrolyte anions are critical for achieving high-voltage stable potassium-metal batteries (PMBs). However, the common anions cannot simultaneously prevent the formation of ‘dead K’ and the corrosion of Al current collector, resulting in poor cycling stability. Here, we demonstrate cyclic anion of hexafluoropropane-1,3-disulfonimide-based electrolytes that can mitigate the ‘dead K’ and remarkably enhance the high-voltage stability of PMBs. Particularly, even using low salt concentration (0.8 M) and additive-free carbonate-based electrolytes, the PMBs with a high-voltage polyanion cathode (4.4 V) also exhibit excellent cycling stability of 200 cycles with a good capacity retention of 83%. This noticeable electrochemical performance is due to the highly efficient passivation ability of the cyclic anions on both anode and cathode surfaces. This cyclic-anion-based electrolyte design strategy is also suitable for lithium and sodium-metal battery technologies. 相似文献
83.
Stephen L. Yelon 《Psychology in the schools》1969,6(2):155-157
84.
85.
86.
87.
88.
89.
90.