全文获取类型
收费全文 | 33765篇 |
免费 | 6813篇 |
国内免费 | 100篇 |
专业分类
耳鼻咽喉 | 725篇 |
儿科学 | 904篇 |
妇产科学 | 914篇 |
基础医学 | 2324篇 |
口腔科学 | 1322篇 |
临床医学 | 5339篇 |
内科学 | 9853篇 |
皮肤病学 | 791篇 |
神经病学 | 1780篇 |
特种医学 | 1024篇 |
外国民族医学 | 1篇 |
外科学 | 4583篇 |
综合类 | 145篇 |
现状与发展 | 3篇 |
一般理论 | 4篇 |
预防医学 | 4813篇 |
眼科学 | 770篇 |
药学 | 1461篇 |
中国医学 | 96篇 |
肿瘤学 | 3826篇 |
出版年
2024年 | 173篇 |
2023年 | 1239篇 |
2022年 | 848篇 |
2021年 | 1569篇 |
2020年 | 1688篇 |
2019年 | 1007篇 |
2018年 | 1783篇 |
2017年 | 1660篇 |
2016年 | 1953篇 |
2015年 | 1933篇 |
2014年 | 2684篇 |
2013年 | 2907篇 |
2012年 | 1893篇 |
2011年 | 1777篇 |
2010年 | 1798篇 |
2009年 | 2068篇 |
2008年 | 1563篇 |
2007年 | 1325篇 |
2006年 | 1522篇 |
2005年 | 1081篇 |
2004年 | 910篇 |
2003年 | 776篇 |
2002年 | 700篇 |
2001年 | 787篇 |
2000年 | 711篇 |
1999年 | 642篇 |
1998年 | 447篇 |
1997年 | 353篇 |
1996年 | 326篇 |
1995年 | 267篇 |
1994年 | 220篇 |
1993年 | 169篇 |
1992年 | 267篇 |
1991年 | 194篇 |
1990年 | 229篇 |
1989年 | 193篇 |
1988年 | 162篇 |
1987年 | 132篇 |
1986年 | 128篇 |
1985年 | 102篇 |
1984年 | 92篇 |
1983年 | 74篇 |
1982年 | 38篇 |
1981年 | 24篇 |
1980年 | 34篇 |
1979年 | 32篇 |
1978年 | 24篇 |
1977年 | 34篇 |
1975年 | 26篇 |
1974年 | 25篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Kuo-yi Jade Chang MHealthEc MHM BSc Lisa Lorraine Dillon MSpecEd BPsych Lil Deverell COMS PhD MEd GradDipO&M BEd Mei Ying Boon PhD BOptom FAAO Lisa Keay PhD MPH BOptom 《Clinical & experimental optometry》2020,103(4):434-448
Despite orientation and mobility (O&M) being a significant factor determining quality of life of people with low vision or blindness, there are no gold standard measures or agreement on how to measure O&M performance. In the first part of this systematic review, an inventory of O&M outcome measures used by recent studies to assess the performance of orientation and/or mobility of adults with vision impairment (low vision and blindness) is presented. A wide variety of O&M outcome measures have been implemented in different fields of study, such as epidemiologic research and interventional studies evaluating training, assistive technology, vision rehabilitation and vision restoration. The most frequent aspect of outcome measures is efficiency such as time, distance, speed and percentage of preferred walking speed, followed by obstacle contacts and avoidance, and dis/orientation and veering. Other less commonly used aspects are target identification, safety and social interaction and self-reported outcome measures. Some studies employ sophisticated equipment to capture and analyse O&M performance in a laboratory setting, while others carry out their assessment in real-world indoor or outdoor environments. In the second part of this review, the appropriateness of implementing the identified outcome measures to assess O&M performance in clinical and functional O&M practice is evaluated. Nearly a half of these outcome measures meet all four criteria of face validity (either clinical or functional), responsiveness, reliability and feasibility and have the potential to be implemented in clinical or functional O&M practice. The findings of this review confirm the complicated and dynamic nature of O&M. Multiple measures are required in any evaluation of O&M performance to facilitate holistic assessment of O&M abilities and limitations of each individual. 相似文献
2.
3.
Interprofessional collaboration and communication in nursing homes: a qualitative exploration of problems in medical care for nursing home residents – study protocol 下载免费PDF全文
4.
5.
6.
7.
8.
Elizabeth A. Mosley PhD MPH Amy J. Schulz PhD MPH MSW Lisa H. Harris MD PhD Barbara A. Anderson PhD 《Women & health》2020,60(7):806-820
ABSTRACT Abortion is legal in South Africa, but negative abortion attitudes remain common and are poorly understood. We used nationally representative South African Social Attitudes Survey data to analyze abortion attitudes in the case of fetal anomaly and in the case of poverty from 2007 to 2016 (n = 20,711; ages = 16+). We measured correlations between abortion attitudes and these important predictors: religiosity, attitudes about premarital sex, attitudes about preferential hiring and promotion of women, and attitudes toward family gender roles. Abortion acceptability for poverty increased over time (b = 0.05, p < .001), but not for fetal anomaly (b = ?0.008, p = .284). Highly religious South Africans reported lower abortion acceptability in both cases (Odds Ratio (OR)anomaly = 0.85, p = .015; ORpoverty = 0.84, p = .02). Premarital sex acceptability strongly and positively predicted abortion acceptability (ORanomaly = 2.63, p < .001; ORpoverty = 2.46, p < .001). Attitudes about preferential hiring and promotion of women were not associated with abortion attitudes, but favorable attitudes about working mothers were positively associated with abortion acceptability for fetal anomaly ((ORanomaly = 1.09, p = .01; ORpoverty = 1.02, p = .641)). Results suggest negative abortion attitudes remain common in South Africa and are closely tied to religiosity, traditional ideologies about sexuality, and gender role expectations about motherhood. 相似文献
9.
10.
HIV risk in vulnerable groups such as itinerant male street labourers is often examined via a focus on individual determinants. This study provides a test of a modified Information-Motivation-Behavioral Skills (IMB) model to predict condom use behaviour among male street workers in urban Vietnam. In a cross-sectional survey using a social mapping technique, 450 male street labourers from 13 districts of Hanoi, Vietnam were recruited and interviewed. Collected data were first examined for completeness; structural equation modelling was then employed to test the model fit. Condoms were used inconsistently by many of these men, and usage varied in relation to a number of factors. A modified IMB model had a better fit than the original IMB model in predicting condom use behaviour. This modified model accounted for 49% of the variance, versus 10% by the original version. In the modified model, the influence of psychosocial factors was moderately high, whilst the influence of HIV prevention information, motivation and perceived behavioural skills was moderately low, explaining in part the limited level of condom use behaviour. This study provides insights into social factors that should be taken into account in public health planning to promote safer sexual behaviour among Asian male street labourers. 相似文献