全文获取类型
收费全文 | 3010篇 |
免费 | 50篇 |
国内免费 | 1篇 |
专业分类
教育 | 2266篇 |
科学研究 | 147篇 |
各国文化 | 40篇 |
体育 | 255篇 |
文化理论 | 34篇 |
信息传播 | 319篇 |
出版年
2022年 | 25篇 |
2021年 | 25篇 |
2020年 | 50篇 |
2019年 | 107篇 |
2018年 | 105篇 |
2017年 | 117篇 |
2016年 | 110篇 |
2015年 | 63篇 |
2014年 | 104篇 |
2013年 | 754篇 |
2012年 | 67篇 |
2011年 | 69篇 |
2010年 | 65篇 |
2009年 | 64篇 |
2008年 | 72篇 |
2007年 | 81篇 |
2006年 | 58篇 |
2005年 | 53篇 |
2004年 | 47篇 |
2003年 | 55篇 |
2002年 | 52篇 |
2001年 | 51篇 |
2000年 | 68篇 |
1999年 | 48篇 |
1998年 | 30篇 |
1997年 | 25篇 |
1996年 | 25篇 |
1995年 | 30篇 |
1994年 | 22篇 |
1993年 | 34篇 |
1992年 | 40篇 |
1991年 | 40篇 |
1990年 | 31篇 |
1989年 | 27篇 |
1988年 | 21篇 |
1987年 | 30篇 |
1986年 | 19篇 |
1985年 | 28篇 |
1984年 | 20篇 |
1983年 | 14篇 |
1982年 | 21篇 |
1981年 | 27篇 |
1980年 | 16篇 |
1979年 | 24篇 |
1978年 | 23篇 |
1977年 | 14篇 |
1976年 | 19篇 |
1975年 | 11篇 |
1969年 | 10篇 |
1968年 | 10篇 |
排序方式: 共有3061条查询结果,搜索用时 15 毫秒
161.
162.
163.
Tove Faber Frandsen Christina Louise Lindhardt Mette Brandt Eriksen 《Journal of the Medical Library Association》2021,109(3):388
Objective:A growing volume of studies address methods for performing systematic reviews of qualitative studies. One such methodological aspect is the conceptual framework used to structure the review question and plan the search strategy for locating relevant studies. The purpose of this case study was to evaluate the retrieval potential of each element of conceptual frameworks in qualitative systematic reviews in the health sciences.Methods:The presence of elements from conceptual frameworks in publication titles, abstracts, and controlled vocabulary in CINAHL and PubMed was analyzed using a set of qualitative reviews and their included studies as a gold standard. Using a sample of 101 publications, we determined whether particular publications could be retrieved if a specific element from the conceptual framework was used in the search strategy.Results:We found that the relative recall of conceptual framework elements varied considerably, with higher recall for patient/population (99%) and research type (97%) and lower recall for intervention/phenomenon of interest (74%), outcome (79%), and context (61%).Conclusion:The use of patient/population and research type elements had high relative recall for qualitative studies. However, other elements should be used with great care due to lower relative recall. 相似文献
164.
165.
166.
167.
A multivariate, theoretical model is developed and tested topredict household telephone ownership. Factors theorized topredict telephone ownership are 1) socio-economic status/resources,2) household composition, 3) cultural background, 4) attachments,includinga) community/mobility ties, b) civic/politicalties, c) group ties, d) personal ties, e) social and institutionalalienation, and of misanthropy, 5) counter-normative behavior,6) psychological well-being, and 7) physical well-being. Theanalysis, indicates that the socio-economic factor in generaland income in particular has the largest impact. All other factorsalso have significant, independent effects with the exceptionthat some, but not all, of the attachment factors and psychologicaland physical well-being are not related to telephone ownership.Overall, non-telephone households can be characterized as marginaloutsiders. 相似文献
168.
169.
170.