全文获取类型
收费全文 | 635篇 |
免费 | 4篇 |
专业分类
教育 | 499篇 |
科学研究 | 27篇 |
各国文化 | 7篇 |
体育 | 40篇 |
文化理论 | 7篇 |
信息传播 | 59篇 |
出版年
2022年 | 4篇 |
2021年 | 7篇 |
2020年 | 12篇 |
2019年 | 8篇 |
2018年 | 13篇 |
2017年 | 17篇 |
2016年 | 13篇 |
2015年 | 15篇 |
2014年 | 14篇 |
2013年 | 164篇 |
2012年 | 14篇 |
2011年 | 9篇 |
2010年 | 11篇 |
2009年 | 4篇 |
2008年 | 14篇 |
2007年 | 9篇 |
2006年 | 15篇 |
2005年 | 15篇 |
2004年 | 6篇 |
2003年 | 16篇 |
2002年 | 9篇 |
2001年 | 4篇 |
2000年 | 4篇 |
1999年 | 7篇 |
1998年 | 5篇 |
1997年 | 6篇 |
1996年 | 11篇 |
1995年 | 12篇 |
1994年 | 12篇 |
1993年 | 7篇 |
1991年 | 7篇 |
1990年 | 5篇 |
1989年 | 5篇 |
1988年 | 4篇 |
1987年 | 4篇 |
1985年 | 11篇 |
1984年 | 8篇 |
1983年 | 11篇 |
1982年 | 5篇 |
1981年 | 16篇 |
1980年 | 8篇 |
1979年 | 8篇 |
1978年 | 6篇 |
1977年 | 9篇 |
1976年 | 7篇 |
1975年 | 9篇 |
1974年 | 7篇 |
1973年 | 13篇 |
1968年 | 3篇 |
1967年 | 3篇 |
排序方式: 共有639条查询结果,搜索用时 62 毫秒
31.
32.
33.
34.
35.
36.
37.
Andrea L. Chapman Laura C. Morgan Gerald Gartlehner 《Health information and libraries journal》2010,27(1):22-27
Background: To minimise retrieval bias, manual literature searches are a key part of the search process of any systematic review. Considering the need to have accurate information, valid results of the manual literature search are essential to ensure scientific standards; likewise efficient approaches that minimise the amount of personnel time required to conduct a manual literature search are of great interest. Objective: The objective of this project was to determine the validity and efficiency of a new manual search method that utilises the scopus ? database. Methods: We used the traditional manual search approach as the gold standard to determine the validity and efficiency of the proposed scopus method. Outcome measures included completeness of article detection and personnel time involved. Using both methods independently, we compared the results based on accuracy of the results, validity and time spent conducting the search, efficiency. Results: Regarding accuracy, the scopus method identified the same studies as the traditional approach indicating its validity. In terms of efficiency, using scopus led to a time saving of 62.5% compared with the traditional approach (3 h versus 8 h). Conclusions: The scopus method can significantly improve the efficiency of manual searches and thus of systematic reviews. 相似文献
38.
Sim Barhoum 《Community College Journal of Research & Practice》2013,37(12):791-808
ABSTRACTStudents at community colleges are being placed into developmental writing classes at significantly high rates, as high as 80% at some colleges. Many of these students are students of color, and the need to help them persist and succeed is of increasing importance. The purpose of this study was to investigate the most promising practices by community college developmental writing programs. This article presents a review of more than 245 publications from over 450 authors, synthesized down to 36 validated studies with the goal of informing scholars and practitioners of the current state of the field. Themes emerging from these studies and a conceptual model through which findings can be viewed are presented. The analysis, with a focus on the structural, curricular, andragogical, and relational domains, documents only validated studies about the most promising practices. This article supports, challenges, and recommends how to better serve students in the developmental writing context. This author hopes to change how colleges implement developmental writing practices so that practitioners will be given the best tools to help all students succeed. 相似文献
39.
Taran Cardone Elizabeth Stoll Turton Gerald Olson Marcia Baxter Magolda 《About Campus》2013,18(5):2-9
Committed to improving how their various programs serve student learning, Taran Cardone, Elizabeth Stoll Turton, Gerald Olson, and Marcia Baxter Magolda describe how their participation in Miami University's Community of Practice on Engaged Learning (COPEL) helped them create developmentally appropriate, learning‐centered approaches that support the complex task of student self‐authorship. 相似文献
40.
Xuan paper is a type of Chinese handmade paper produced for traditional calligraphy and painting in China since the Tang Dynasty (618–907 AD), and is therefore an important cultural heritage material. In this study, the fluorescence and photochemical properties of Xuan paper were investigated. Xuan paper exhibits auto-fluorescence in the blue spectral range (450–500 nm) and UVA photolysis of the paper resulted in a substantial reduction in the blue fluorescence together with the formation of chromophores absorbing in the visible spectrum, resulting in photoyellowing of the paper. A more significant yellowing of paper was observed when irradiated in the dry state than under wet conditions. The associated photogeneration of hydrogen peroxide and superoxide from three types of Xuan paper samples during irradiation showed a correlation between the yields of reactive oxygen species and their relative yellowing rates. The results are interpreted in terms of sensitised photooxidation via a mechanism of electron transfer involving the fluorophores in their excited singlet states being responsible for the photodegradation of Xuan paper. SEM/EDS analyses were performed on the Xuan paper samples to investigate their morphological and elemental characteristics. Silica-containing fibres characteristic of a special rice straw that grows in siliceous soil were observed in all types of Xuan paper. Micron-sized calcium precipitates possibly formed from the “lime-steaming” manufacture process were shown to protect against the acidification of paper during accelerated thermal ageing. 相似文献