全文获取类型
收费全文 | 1452篇 |
免费 | 11篇 |
国内免费 | 33篇 |
专业分类
教育 | 634篇 |
科学研究 | 359篇 |
各国文化 | 3篇 |
体育 | 352篇 |
综合类 | 9篇 |
文化理论 | 5篇 |
信息传播 | 134篇 |
出版年
2024年 | 6篇 |
2023年 | 3篇 |
2022年 | 8篇 |
2021年 | 4篇 |
2020年 | 3篇 |
2016年 | 2篇 |
2015年 | 5篇 |
2014年 | 18篇 |
2013年 | 13篇 |
2012年 | 75篇 |
2011年 | 149篇 |
2010年 | 48篇 |
2009年 | 25篇 |
2008年 | 65篇 |
2007年 | 84篇 |
2006年 | 99篇 |
2005年 | 97篇 |
2004年 | 106篇 |
2003年 | 98篇 |
2002年 | 56篇 |
2001年 | 58篇 |
2000年 | 81篇 |
1999年 | 39篇 |
1998年 | 28篇 |
1997年 | 24篇 |
1996年 | 27篇 |
1995年 | 20篇 |
1994年 | 19篇 |
1993年 | 15篇 |
1992年 | 24篇 |
1991年 | 27篇 |
1990年 | 15篇 |
1989年 | 26篇 |
1988年 | 8篇 |
1987年 | 15篇 |
1986年 | 21篇 |
1985年 | 5篇 |
1984年 | 13篇 |
1983年 | 9篇 |
1982年 | 14篇 |
1981年 | 10篇 |
1980年 | 2篇 |
1978年 | 2篇 |
1977年 | 2篇 |
1975年 | 2篇 |
1974年 | 2篇 |
1973年 | 2篇 |
1959年 | 6篇 |
1956年 | 2篇 |
1948年 | 3篇 |
排序方式: 共有1496条查询结果,搜索用时 8 毫秒
61.
62.
63.
64.
LaBeause J Van de Water N Carey P Fielder M Sorrow B Woolbright C 《Medical reference services quarterly》1999,18(2):81-89
Health sciences librarians are being called upon to be more proactive in their institutions' continuing education efforts. In an effort to identify whether search requests indicated CE needs, a study was conducted by a group of members of GaIN (Georgia Interactive Network for Medical Information). MEDLINE requests from health care professionals for subject specific clinical topics were collected during a six-month period via a standard search request form created for the study. Copies of all completed requests were collected and broad ICD-9 codes assigned to the search topics. Institutional reports were generated for each participating library to share with hospital CE coordinators. They were also compiled for the group as a whole, and reflected the "hottest" topics requested during the study period for physicians and for non-physicians (nurses, allied health, administrators). A survey to hospital librarians and CE educators showed some value in the reports, but greater potential for further collaboration between librarians and CE coordinators. 相似文献
65.
This paper documents the evolving uses of the Internet made by public health graduate students and traces the development of their search methods and critical evaluative criteria. Early in the first semester and again six months later, twenty-four graduate students in a problem-based learning curriculum, which emphasizes evidence-based critical thinking skills, were required to describe their most helpful resources and to evaluate these resources critically. The answers were coded for the types of resources the students used, how frequently they were used, and why they were used. Student perception of the usefulness of resources, especially the Internet, and ability to evaluate these resources critically changed greatly. Initially, 96% of the students stated that the Internet was their most helpful resource. Six months later, these students continued to use the Internet; however, it was not their most useful source. At the later point, students had very specific uses for the Internet. Their most frequently used evaluation criterion was the reliability and objectivity of the source of the information. By the end of the first year of study, the majority of the students demonstrated an understanding of the principles of evidence-based practice and applied them to their research and analysis of information resources. 相似文献
66.
67.
68.
69.
The objectives of this study were to determine nurses' use of electronic databases to inform practice. A questionnaire survey of 114 nurses working on five acute wards in a large inner city teaching hospital investigated their general use of computers and the three databases, CINAHL, MEDLINE and the Cochrane Library. Eighty-two qualified nurses responded (response rate 72%). The results show limited confidence and low frequency in using the databases. Thirty-four per cent expressed low confidence using CINAHL. Twenty-seven per cent used CINAHL on a regular basis. Twenty-two per cent never used it. Eighteen per cent were unaware that it was available locally. Knowledge and use of MEDLINE was even lower with only 18% using it regularly. Knowledge of the Cochrane Library was extremely limited, with 75% unaware of its existence. Use of a home computer and higher education were associated with higher frequency of use of CINAHL and MEDLINE. If nurses are to make use of electronic resources to contribute to evidence-based practice, effort needs to be put into ensuring that already qualified nurses have basic computer skills and specific knowledge of available resources. More emphasis should be placed on 'evidence-based' resources, such as the Cochrane library, as sources of information for practice. 相似文献
70.
The aim of this study was to determine the influence of breathing frequency and tidal volume on resting heart rate variability in children aged 9 years (n = 29) and 16 years (n = 19). Heart rate variability was measured in four conditions: (1) without the control of ventilation followed at random by (2) a fixed breathing frequency of 12 breaths x min(-1), (3) a breathing frequency of 12 breaths x min(-1) but with a fixed tidal volume of 30% vital capacity and (4) a fixed breathing frequency of 6 breaths x min(-1) and a tidal volume of 30% vital capacity. A total of 128 RR intervals (the time between two spikes in the heart rate) were detected and absolute high- and low-frequency spectral components were calculated using autoregressive modelling. The younger children were unable to control ventilation to achieve conditions 3 and 4; therefore, a 2 x 2 (group x condition) analysis of variance was used to analyse conditions 1 and 2. There were significant interactions between group and heart rate variability conditions for the low-frequency component and the ratio of low to high frequencies (P < 0.001). The main effect for condition showed that at 12 breaths x min(-1) with no fixed tidal volume there was a significantly higher standard deviation of the RR interval, total power and high-frequency (P< 0.01) and low-frequency spectral components (P < 0.05) than in the condition with no ventilatory control. Across the four breathing conditions for the older participants, the high-frequency spectral component was significantly higher in the condition at 6 breaths x min(-1) with a fixed tidal volume than in that with no ventilatory control (P < 0.005); the ratio of high to low frequencies was significantly lower for the spontaneous condition than those performed at 12 breaths x min(-1) (P < 0.001). The results provide evidence of the need for ventilatory control when assessing short-term resting heart rate variability in children. 相似文献