全文获取类型
| 收费全文 | 1420篇 |
| 免费 | 13篇 |
| 国内免费 | 1篇 |
专业分类
| 教育 | 1031篇 |
| 科学研究 | 82篇 |
| 各国文化 | 14篇 |
| 体育 | 134篇 |
| 文化理论 | 24篇 |
| 信息传播 | 149篇 |
出版年
| 2021年 | 13篇 |
| 2020年 | 21篇 |
| 2019年 | 33篇 |
| 2018年 | 36篇 |
| 2017年 | 42篇 |
| 2016年 | 52篇 |
| 2015年 | 21篇 |
| 2014年 | 29篇 |
| 2013年 | 357篇 |
| 2012年 | 43篇 |
| 2011年 | 40篇 |
| 2010年 | 28篇 |
| 2009年 | 26篇 |
| 2008年 | 36篇 |
| 2007年 | 39篇 |
| 2006年 | 34篇 |
| 2005年 | 36篇 |
| 2004年 | 34篇 |
| 2003年 | 27篇 |
| 2002年 | 32篇 |
| 2001年 | 21篇 |
| 2000年 | 23篇 |
| 1999年 | 23篇 |
| 1998年 | 13篇 |
| 1997年 | 21篇 |
| 1996年 | 14篇 |
| 1995年 | 15篇 |
| 1994年 | 14篇 |
| 1993年 | 22篇 |
| 1992年 | 14篇 |
| 1991年 | 31篇 |
| 1990年 | 8篇 |
| 1989年 | 9篇 |
| 1988年 | 20篇 |
| 1987年 | 15篇 |
| 1986年 | 12篇 |
| 1985年 | 14篇 |
| 1984年 | 11篇 |
| 1983年 | 12篇 |
| 1982年 | 11篇 |
| 1981年 | 15篇 |
| 1980年 | 10篇 |
| 1979年 | 13篇 |
| 1978年 | 11篇 |
| 1977年 | 10篇 |
| 1976年 | 12篇 |
| 1974年 | 6篇 |
| 1972年 | 6篇 |
| 1969年 | 6篇 |
| 1967年 | 6篇 |
排序方式： 共有1434条查询结果，搜索用时 15 毫秒
1.
Objective: To determine whether information retrieval might be enhanced by making each component of a structured abstract a separately searchable field. Design: Parallel searches on records arranged so that each abstract could either be searched in its entirety or as a collection of structured fields. Subjects: Records about cardiovascular disease downloaded from MEDLINE and tested against clinical questions derived from a concurrent survey of CD-ROM use in three health science libraries. Intervention: The investigators identified terms used to structure abstracts on MEDLINE and imported the abstracts into an Idealist database prior to searching using keywords from clinical questions. Measurements and main results: recall and precision rates are given for each question in the ‘structured’ and the ‘unstructured’ set of records. Conclusions: Use of structured, rather than unstructured, abstracts improves precision at the ex-pense of recall and places heavier demands upon the searcher’s skill in choosing the correct fields within the abstract to search. Further investigation requires more accurate simulation of MEDLINE software that utilizes features such as MeSH terms, explode, facilities and delimiters. 相似文献
2.
3.
4.
5.
This research analyzed a dataset of academic libraries' posts on Facebook. It applied a text and data analytics approach to a dataset collected from the Facebook posts of academic libraries at the top 100 English-speaking universities, as listed by the 2014 Shanghai World University Rankings. The dataset is from a two-year posting history of 18,333 unique posts, 113,621 likes, and 3401 comments. Less than a quarter of the libraries had more than 2000 post-related likes, and only seven received more than 100 comments on their postings. Content analysis identified the most prevalent single word (unigrams), bigrams (two-word sequences), and trigrams (three-word sequences) in high and low engagement content. Semantic analysis identified the semantic categories for posts with high and low engagement. The findings can assist academic libraries in their social media strategies for engagement, marketing, and visibility. 相似文献
6.
Increased genetic testing in personalized medicine presents unique challenges for couples, including managing disease risk and potential discrimination as a couple. This study investigated couples’ conflicts and support gaps as they coped with perceived genetic discrimination. We also explored the degree to which communal coping was beneficial in reducing support gaps and ultimately stress. Dyadic analysis of married adults (N?=?266, 133 couples), in which one person had the genetic risk for serious illness, showed that perceived discrimination predicted more frequent conflicts about alpha-1 antitrypsin deficiency-related treatment, privacy boundaries, and finances, which, in turn, predicted wider gaps in emotion and esteem support, and greater stress for both spouses. Communal coping predicted lower support gaps for both partners and marginally lower stress. 相似文献
7.
Joseph J. Murphy Marie H. Murphy Ciaran MacDonncha Niamh Murphy Alan M. Nevill Catherine B. Woods 《Measurement in physical education and exercise science》2017,21(3):134-141
The purpose of this study was to compare the validity and reliability of three short physical activity self-report instruments to determine their potential for use with university student populations. The participants (N = 155; 44.5% male; 22.9 ± 5.13 years) wore an accelerometer for 9 consecutive days and completed a single-item measure, the a brief two item measure and the International Physical Activity Questionnaire—Short Form questionnaires on day 1 and 9. Correlations between self-reported and accelerometer derived moderate-to-vigorous physical activity levels were moderate for the International Physical Activity Questionnaire—Short Form, while poor for the single-item measure and the a brief two item measure. The agreement level was high with the International Physical Activity Questionnaire—Short Form (77.4%) and moderate for both the single-item measure (45.2 %) and a brief two item measure (44.5 %). The intraclass correlations between the two administrations were moderate to strong across all measures (0.52–0.70) in 133 participants. The International Physical Activity Questionnaire—Short Form is the most suitable of these three self-report instruments for use with this population due to higher correlations and levels of agreement with accelerometry. 相似文献
8.
9.
10.
Alan M. Schwitzer Shana Pribesh Amanda Ellis‐O'Quinn Patricia B. Huber Elizabeth C. Wilmer 《Journal of College Counseling》2016,19(1):76-95
This article focuses on counseling research in the community college context. The article suggests the need for a robust community college knowledge base, describes some limitations of the current community college literature, and suggests a framework for more effective work in this area. The authors’ own experiences and selected examples of published studies are used as illustrations of the hurdles encountered and solutions available when examining counseling theories, practices, and outcomes in 2‐year settings. 相似文献