全文获取类型
收费全文 | 24004篇 |
免费 | 1416篇 |
国内免费 | 46篇 |
专业分类
耳鼻咽喉 | 175篇 |
儿科学 | 765篇 |
妇产科学 | 858篇 |
基础医学 | 3034篇 |
口腔科学 | 409篇 |
临床医学 | 3727篇 |
内科学 | 3955篇 |
皮肤病学 | 225篇 |
神经病学 | 2526篇 |
特种医学 | 472篇 |
外科学 | 2145篇 |
综合类 | 263篇 |
一般理论 | 32篇 |
预防医学 | 3435篇 |
眼科学 | 326篇 |
药学 | 1448篇 |
中国医学 | 24篇 |
肿瘤学 | 1647篇 |
出版年
2024年 | 15篇 |
2023年 | 169篇 |
2022年 | 248篇 |
2021年 | 462篇 |
2020年 | 311篇 |
2019年 | 480篇 |
2018年 | 575篇 |
2017年 | 448篇 |
2016年 | 488篇 |
2015年 | 586篇 |
2014年 | 795篇 |
2013年 | 1184篇 |
2012年 | 1761篇 |
2011年 | 1922篇 |
2010年 | 993篇 |
2009年 | 893篇 |
2008年 | 1622篇 |
2007年 | 1750篇 |
2006年 | 1639篇 |
2005年 | 1633篇 |
2004年 | 1625篇 |
2003年 | 1459篇 |
2002年 | 1459篇 |
2001年 | 271篇 |
2000年 | 192篇 |
1999年 | 235篇 |
1998年 | 279篇 |
1997年 | 235篇 |
1996年 | 162篇 |
1995年 | 183篇 |
1994年 | 160篇 |
1993年 | 120篇 |
1992年 | 120篇 |
1991年 | 97篇 |
1990年 | 72篇 |
1989年 | 79篇 |
1988年 | 67篇 |
1987年 | 69篇 |
1986年 | 53篇 |
1985年 | 67篇 |
1984年 | 61篇 |
1983年 | 58篇 |
1982年 | 67篇 |
1981年 | 59篇 |
1980年 | 35篇 |
1979年 | 24篇 |
1978年 | 23篇 |
1977年 | 16篇 |
1972年 | 17篇 |
1969年 | 16篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
Weimin Hu Deborah Kelly Barnard Esther Parker Ann Thomas 《环境与职业医学》2007,24(1):117-119
A drinking water supply is a complicated system in its construction,operation,maintenance and need for public health surveillance. 相似文献
22.
23.
Deborah E Meyers Jo Maddicks-Law David M Seaton Andrew J Galbraith Ross C Cuneo 《The Journal of heart and lung transplantation》2005,24(1):110-114
It has been reported that growth hormone (GH) deficiency induced cardiomyopathy responds to growth hormone replacement therapy. We describe the case of a middle-aged male with cardiomyopathic heart failure and growth hormone deficiency of the adult secondary to surgical panhypopituitarism. We demonstrate clinical and hemodynamic improvement of cardiac function with growth hormone replacement therapy despite underlying structural heart disease. 相似文献
24.
Deborah A Cahn-Weiner Sarah Tomaszewski Farias Laura Julian Danielle J Harvey Joel H Kramer Bruce R Reed Dan Mungas Margaret Wetzel Helena Chui 《Journal of the International Neuropsychological Society》2007,13(5):747-757
Impaired ability to conduct daily activities is a diagnostic criterion for dementia and a determinant of healthcare services utilization and caregiver burden. What predicts decline in instrumental activities of daily living (IADLs) is not well understood. This study examined measures of episodic memory, executive function, and MRI brain volumes in relation to baseline IADLs and as predictors of rate of IADL change. Participants were 124 elderly persons with cognitive function between normal and moderate dementia both with and without significant small vessel cerebrovascular disease. Random effects modeling showed that baseline memory and executive function (EXEC) were associated with baseline IADL scores, but only EXEC was independently associated with rate of change in IADLs. Whereas hippocampal and cortical gray matter volumes were significantly associated with baseline IADL scores, only hippocampal volume was associated with IADL change. In a model including cognitive and neuroimaging predictors, only EXEC independently predicted rate of decline in IADL scores. These findings indicate that greater executive dysfunction at initial assessment is associated with more rapid decline in IADLs. Perhaps executive function is particularly important with respect to maintaining IADLs. Alternatively, executive dysfunction may be a sentinel event indicating widespread cortical involvement and poor prognosis. 相似文献
25.
Patricia Lye Charlotte Heidenreich Rebekah Wang-Cheng Dawn Bragg Deborah Simpson 《Ambulatory Pediatrics》2003,3(2):93-97
OBJECTIVES: To determine if experienced clinical educators (CEs) can improve their teaching by incorporating 4 literature-based teaching methods into their instruction. METHODS: We trained 7 experienced CEs on the teaching methods during a monthly faculty development program. Each CE recorded use of these methods during 10 months on a personal digital assistant. We compared the CEs' teaching evaluations with those of nonparticipating faculty by analysis of variance at baseline, during the study period, and for 1 year after the study. RESULTS: Reported use of 2 teaching methods (priming and feedback) increased significantly over use at baseline; use of 2 other methods (teaching in the patient's presence and 1-2 focal teaching points) remained constant. Scores on the CEs' teaching evaluations were significantly higher during the study period on 1 item, whereas the comparison group showed no changes. The changes persisted during the follow-up period. CEs reported that the teaching methods focused the learner and teacher, making subsequent encounters more productive. They also found that the act of entering data daily prompted them to reflect on their teaching. CONCLUSIONS: Experienced teachers can be persuaded to incorporate new methods into their daily teaching. Reflection on teaching is enhanced with group support and daily reminders. With these interventions, teaching effectiveness of these experienced educators improved. 相似文献
26.
Michael W Ross Amy Jo Harzke Deborah P Scott Kelly McCann Michael Kelley 《AIDS education and prevention》2006,18(6):504-517
We report select outcomes from an evaluation of Project Wall Talk, a community-based, peer-led HIV prevention education program implemented in 36 Texas State prison units. Peer educators completed questionnaires prior to receipt of a 40-hour intensive training (N = 590) and at 9-month follow-up (N = 257). Students (N = 2506) completed questionnaires pre- and post-receipt of peer educator-led HIV education sessions. Peer educators and their students showed significant increases in HIV-related knowledge. Peer educators showed significant increases in assessment of their skills as educators. For both peer educators and students, significant differences in HIV-related knowledge were indicated across categories of prior educational level attained and race/ethnicity; no such differences were indicated at follow-up. Compared with baseline, a significantly greater proportion of peer educators reported ever having had an HIV test. After receiving peer-led education, a significantly smaller proportion of students reported they knew their HIV status and more indicated plans to take an HIV test. Additionally, in months 12 and 18 following program implementation, the numbers of HIV tests at the five units that implemented the peer education program were roughly twice that of five, matched comparison units without the peer education program. Based on peer educator reports, we projected that peer educators (N = 257) may have as many as 84,000 or more annual opportunities to share HIV-related knowledge with other prisoners outside the classroom. 相似文献
27.
28.
29.
Christine Roberts Deborah Turnbull Les Irwig 《Australian and New Zealand journal of public health》1992,16(1):58-65
Abstract: The aim of this study was to determine changes in Sydney general practitioners' (GPs) knowledge about, attitude towards and intention to recommend screening mammography over the two years since a screening mammography program was first implemented in the Central Sydney Health Service (CSHS) area. 123 GPs from the CSHS area were selected from a list maintained by the Breast X-ray Programme, while 127 GPs from the rest of Sydney were selected from the Yellow Pages telephone directory. The overall response rate was 84 per cent. Outcomes were assessed by a self-administered questionnaire covering knowledge, attitudes and beliefs, self-report of recent referral practice, intention to recommend, and sources of information about mammography screening. Demographic data were also collected. Results showed that overall knowledge has increased both inside and outside the CSHS area, but important deficiencies in knowledge remain in both areas. Attitudes to screening mammography have improved in the CSHS area, especially regarding the efficacy of screening mammography and patient compliance. Importantly, positive views of screening mammography have declined outside the CSHS area, especially about whether screening mammography can save women's lives. GPs in both areas remain concerned about costs. The presence and strategies of the Breast X-ray Programme have had some positive effect on the attitudes of GPs towards, but not knowledge of, screening mammography. 相似文献
30.
Robin E. Clark Ph.D. Philip W. Bush M.B.A. Deborah R. Becker M.Ed. Robert E. Drake M.D. Ph.D. 《Administration and policy in mental health》1996,24(1):63-77
Recent research suggests that, for some people with severe mental illness, supported employment could improve vocational outcomes for little additional expense. This study describes the costs and client outcomes in one mental health center that converted two rehabilitative day treatment programs to supported employment. Converting from day treatment to supported employment improved vocational outcomes significantly without increasing costs. Although total costs for community treatment were lower in both sites after implementing supported employment, differences appeared to be due to decreasing unit costs over the study period. Results illustrate the importance of testing the effects of cost estimation methods on findings.This study was supported by West Central Services, the New Hampshire Division of Mental Health and Developmental Services, and NIMH grant K02-MH-00839. The authors are grateful to Jesse Turner and Phil Wyzik for facilitating the research. 相似文献