全文获取类型
收费全文 | 5652篇 |
免费 | 391篇 |
国内免费 | 23篇 |
专业分类
耳鼻咽喉 | 30篇 |
儿科学 | 178篇 |
妇产科学 | 73篇 |
基础医学 | 701篇 |
口腔科学 | 95篇 |
临床医学 | 736篇 |
内科学 | 1246篇 |
皮肤病学 | 60篇 |
神经病学 | 539篇 |
特种医学 | 363篇 |
外科学 | 637篇 |
综合类 | 108篇 |
一般理论 | 2篇 |
预防医学 | 490篇 |
眼科学 | 90篇 |
药学 | 423篇 |
1篇 | |
中国医学 | 10篇 |
肿瘤学 | 284篇 |
出版年
2023年 | 26篇 |
2022年 | 57篇 |
2021年 | 136篇 |
2020年 | 87篇 |
2019年 | 125篇 |
2018年 | 139篇 |
2017年 | 99篇 |
2016年 | 113篇 |
2015年 | 146篇 |
2014年 | 181篇 |
2013年 | 240篇 |
2012年 | 384篇 |
2011年 | 383篇 |
2010年 | 240篇 |
2009年 | 229篇 |
2008年 | 317篇 |
2007年 | 286篇 |
2006年 | 298篇 |
2005年 | 329篇 |
2004年 | 294篇 |
2003年 | 258篇 |
2002年 | 250篇 |
2001年 | 82篇 |
2000年 | 71篇 |
1999年 | 61篇 |
1998年 | 117篇 |
1997年 | 108篇 |
1996年 | 115篇 |
1995年 | 90篇 |
1994年 | 70篇 |
1993年 | 58篇 |
1992年 | 42篇 |
1991年 | 42篇 |
1990年 | 34篇 |
1989年 | 63篇 |
1988年 | 51篇 |
1987年 | 52篇 |
1986年 | 37篇 |
1985年 | 43篇 |
1984年 | 35篇 |
1983年 | 33篇 |
1982年 | 25篇 |
1981年 | 22篇 |
1980年 | 15篇 |
1979年 | 16篇 |
1978年 | 14篇 |
1977年 | 17篇 |
1976年 | 14篇 |
1975年 | 16篇 |
1973年 | 15篇 |
排序方式: 共有6066条查询结果,搜索用时 31 毫秒
991.
992.
Gavin R McCormack Billie Giles-Corti Anna Timperio Georgina Wood Karen Villanueva 《The international journal of behavioral nutrition and physical activity》2011,8(1):30
Background
Children who participate in regular physical activity obtain health benefits. Preliminary pedometer-based cut-points representing sufficient levels of physical activity among youth have been established; however limited evidence regarding correlates of achieving these cut-points exists. The purpose of this study was to identify correlates of pedometer-based cut-points among elementary school-aged children. 相似文献993.
994.
Mariane Sentenac Aoife Gavin Catherine Arnaud Michal Molcho Emmanuelle Godeau Saoirse Nic Gabhainn 《The Journal of adolescent health》2011,48(5):461-466
PurposeTo explore bullying victimization among French and Irish students with a disability or chronic illness (D/CI), considering individual, social, and family factors. We investigated this issue in France and Ireland because of the documented differences between these two countries on relevant contextual factors.MethodsData from 12,048 students aged 11, 13, and 15 years (50.1% were boys) as part of the cross-national study 2006 Health Behaviour in School-aged Children were analyzed. Self-completion questionnaires were administered in classrooms; information on socio-demographic characteristics, bullying involvement, D/CI, school participation, social network, and family were collected. Multivariate logistic regressions were performed with individual, social, and family cofactors.ResultsOverall, the prevalence of bullying victimization was significantly higher in France compared with Ireland (34.2% [33.1–35.5] and 25.9% [24.5–27.4, respectively]). Youngest were more likely to report victimization; however, no gender differences were observed. In both countries, students with D/CI were significantly more likely to report that they have been bullied compared with students without D/CI, and a significant additional risk of being bullied was found when students reported D/CI with restriction in school participation. Regardless of country and D/CI status, being bullied was significantly associated with weaker social support and difficulty of communication with fathers, with even stronger associations found among students with D/CI.ConclusionAdolescents with D/CI are more likely to be victimized than their peers, with a similar risk in both countries. Besides individual, social and family factors are consistently associated to bullying victimization across countries. These results will guide future antibullying prevention programs. 相似文献
995.
996.
School site and the potential to walk to school: the impact of street connectivity and traffic exposure in school neighborhoods 总被引:2,自引:0,他引:2
Giles-Corti B Wood G Pikora T Learnihan V Bulsara M Van Niel K Timperio A McCormack G Villanueva K 《Health & place》2011,17(2):545-550
The impact of neighborhood walkability (based on street connectivity and traffic exposure) within 2 km of public primary schools on children regularly walking to school was examined. The most (n=13) and least walkable (n=12) schools were selected using a school-specific 'walkability' index and a cross sectional study undertaken of Year 5, 6 and 7 children (n=1480) and consenting parents (n=1332). After adjustment, regularly walking to school was higher in children attending schools in high walkable neighborhoods (i.e, high street connectivity and low traffic volume) (Odds ratio (OR) 3.63; 95% Confidence Interval (CI) 2.01-6.56), and less likely in neighborhoods with high connectivity but high traffic volume (OR 0.32; 95% CI 0.22-0.47). Connected street networks provide direct routes to school but when designed for heavy traffic, the potential for children to walk to school is reduced. This highlights the importance of carefully considering school siting and, particularly, street design in school neighborhoods. 相似文献
997.
Jacqui Webster PhD Sarah Asi Faletoese Su'a MHM Merina Ieremia Severine Bompoint BSc Claire Johnson BA MIPH Gavin Faeamani MPH Miraneta Vaiaso Wendy Snowdon BSc MA MIPH PhD Mary‐Anne Land MPH PhD Kathy Trieu BAppSc MPH Satu Viali Marj Moodie PhD Colin Bell BSc MSc PhD Bruce Neal MBChB MRCP PhD Mark Woodward BSc MSc PhD 《Journal of clinical hypertension (Greenwich, Conn.)》2016,18(9):884-891
This project measured population salt intake in Samoa by integrating urinary sodium analysis into the World Health Organization's (WHO's) STEPwise approach to surveillance of noncommunicable disease risk factors (STEPS). A subsample of the Samoan Ministry of Health's 2013 STEPS Survey collected 24‐hour and spot urine samples and completed questions on salt‐related behaviors. Complete urine samples were available for 293 participants. Overall, weighted mean population 24‐hour urine excretion of salt was 7.09 g (standard error 0.19) to 7.63 g (standard error 0.27) for men and 6.39 g (standard error 0.14) for women (P=.0014). Salt intake increased with body mass index (P=.0004), and people who added salt at the table had 1.5 g higher salt intakes than those who did not add salt (P=.0422). A total of 70% of the population had urinary excretion values above the 5 g/d cutoff recommended by the WHO. A reduction of 30% (2 g) would reduce average population salt intake to 5 g/d, in line with WHO recommendations. While challenging, integration of salt monitoring into STEPS provides clear logistical and cost benefits and the lessons communicated here can help inform future programs. 相似文献
998.
Shawn R. Lin John G. Ladas Gavin G. Bahadur Saba Al-Hashimi Roberto Pineda 《Seminars in ophthalmology》2019,34(4):317-326
ABSTRACTVarious machine learning techniques have been developed for keratoconus detection and refractive surgery screening. These techniques utilize inputs from a range of corneal imaging devices and are built with automated decision trees, support vector machines, and various types of neural networks. In general, these techniques demonstrate very good differentiation of normal and keratoconic eyes, as well as good differentiation of normal and form fruste keratoconus. However, it is difficult to directly compare these studies, as keratoconus represents a wide spectrum of disease. More importantly, no public dataset exists for research purposes. Despite these challenges, machine learning in keratoconus detection and refractive surgery screening is a burgeoning field of study, with significant potential for continued advancement as imaging devices and techniques become more sophisticated. 相似文献
999.
1000.