全文获取类型
| 收费全文 | 221篇 |
| 免费 | 5篇 |
专业分类
| 教育 | 142篇 |
| 科学研究 | 52篇 |
| 各国文化 | 2篇 |
| 体育 | 8篇 |
| 文化理论 | 4篇 |
| 信息传播 | 18篇 |
出版年
| 2021年 | 6篇 |
| 2020年 | 8篇 |
| 2019年 | 5篇 |
| 2018年 | 8篇 |
| 2017年 | 7篇 |
| 2016年 | 7篇 |
| 2015年 | 3篇 |
| 2014年 | 7篇 |
| 2013年 | 62篇 |
| 2012年 | 5篇 |
| 2011年 | 2篇 |
| 2010年 | 4篇 |
| 2009年 | 3篇 |
| 2007年 | 2篇 |
| 2006年 | 3篇 |
| 2005年 | 2篇 |
| 2004年 | 5篇 |
| 2003年 | 3篇 |
| 2002年 | 4篇 |
| 2001年 | 4篇 |
| 1997年 | 2篇 |
| 1994年 | 2篇 |
| 1993年 | 5篇 |
| 1992年 | 3篇 |
| 1987年 | 2篇 |
| 1984年 | 3篇 |
| 1982年 | 2篇 |
| 1978年 | 2篇 |
| 1974年 | 3篇 |
| 1969年 | 2篇 |
| 1962年 | 2篇 |
| 1961年 | 2篇 |
| 1960年 | 1篇 |
| 1942年 | 1篇 |
| 1927年 | 1篇 |
| 1926年 | 1篇 |
| 1925年 | 2篇 |
| 1924年 | 1篇 |
| 1922年 | 1篇 |
| 1921年 | 1篇 |
| 1920年 | 1篇 |
| 1919年 | 1篇 |
| 1918年 | 2篇 |
| 1910年 | 1篇 |
| 1908年 | 3篇 |
| 1905年 | 2篇 |
| 1900年 | 1篇 |
| 1895年 | 1篇 |
| 1890年 | 5篇 |
| 1889年 | 8篇 |
排序方式： 共有226条查询结果，搜索用时 37 毫秒
51.
52.
This paper presents results of a study of corporate library selection activity performed to support four global corporations. The firms examined are involved in providing communication, knowledge in its different forms, and computing. Using these results, this paper synthesizes literature on selection and collection development to present an approach to developing an eventual theory of collection development. Using this approach, such a theory would predict the performance of selection activity; the operation of its attributes, such as its cost, centralization, and formalization; and the operation of other collection development activities. Concurrently, it would explain these predictions using dynamics such as the need to include specified ideas within selected content, the need to cope with selector's abilities to choose vast amounts of content, the need to contain selection cost, and the need to gather material together so as to support browsing and its resulting impromptu development of ideas. 相似文献
53.
54.
55.
56.
57.
58.
This paper deals with real-time discrete adaptive output trajectory tracking for induction motors in the presence of bounded disturbances. A recurrent high order neural network structure is used to design a nonlinear observer and based on this model, a discrete-time control law is derived, which combines discrete-time block control and sliding modes techniques. Applicability of the scheme is illustrated via experimental results in real-time for a three phase induction motor. 相似文献
59.
German Journal of Exercise and Sport Research - 相似文献
60.
In order to plan appropriate cooperative programs for particular higher education consortia, it is necessary to identify the characteristics of these organizations. The spatial configuration technique was used to illustrate the impact of eleven variables of the member institutions in differentiating among four consortia. Six of the variables — Control, Highest Degree Awarded, Percentage of Males, Math SAT Scores, Conventional Orientation, Scientific Orientation, and Endowment — were found to be significant in differentiating among the consortia. It was concluded that the spatial configuration technique was an effective way of visually comparing those consortia composed of member institutions, which as groups had similar and dissimilar characteristics. 相似文献