全文获取类型
收费全文 | 73262篇 |
免费 | 7186篇 |
国内免费 | 1339篇 |
专业分类
耳鼻咽喉 | 373篇 |
儿科学 | 1446篇 |
妇产科学 | 747篇 |
基础医学 | 4569篇 |
口腔科学 | 1672篇 |
临床医学 | 11296篇 |
内科学 | 12497篇 |
皮肤病学 | 580篇 |
神经病学 | 4871篇 |
特种医学 | 1856篇 |
外国民族医学 | 6篇 |
外科学 | 4463篇 |
综合类 | 9820篇 |
现状与发展 | 5篇 |
一般理论 | 2篇 |
预防医学 | 11528篇 |
眼科学 | 625篇 |
药学 | 6333篇 |
131篇 | |
中国医学 | 5341篇 |
肿瘤学 | 3626篇 |
出版年
2024年 | 185篇 |
2023年 | 1610篇 |
2022年 | 2198篇 |
2021年 | 3512篇 |
2020年 | 3360篇 |
2019年 | 2986篇 |
2018年 | 2922篇 |
2017年 | 2907篇 |
2016年 | 2914篇 |
2015年 | 2866篇 |
2014年 | 6292篇 |
2013年 | 6410篇 |
2012年 | 5241篇 |
2011年 | 5274篇 |
2010年 | 3905篇 |
2009年 | 3513篇 |
2008年 | 3605篇 |
2007年 | 3641篇 |
2006年 | 3048篇 |
2005年 | 2480篇 |
2004年 | 1956篇 |
2003年 | 1713篇 |
2002年 | 1314篇 |
2001年 | 1184篇 |
2000年 | 917篇 |
1999年 | 792篇 |
1998年 | 575篇 |
1997年 | 594篇 |
1996年 | 482篇 |
1995年 | 467篇 |
1994年 | 403篇 |
1993年 | 326篇 |
1992年 | 325篇 |
1991年 | 287篇 |
1990年 | 238篇 |
1989年 | 212篇 |
1988年 | 211篇 |
1987年 | 163篇 |
1986年 | 128篇 |
1985年 | 118篇 |
1984年 | 103篇 |
1983年 | 70篇 |
1982年 | 67篇 |
1981年 | 61篇 |
1980年 | 58篇 |
1979年 | 34篇 |
1978年 | 29篇 |
1977年 | 26篇 |
1976年 | 18篇 |
1975年 | 18篇 |
排序方式: 共有10000条查询结果,搜索用时 125 毫秒
1.
《Journal of the Academy of Nutrition and Dietetics》2022,122(11):2060-2071
BackgroundVoices for Food was a longitudinal community, food pantry–based intervention informed by the social ecological model, and designed to improve food security, dietary intake, and quality among clients, which was carried out in 24 rural food pantries across 6 Midwestern states.ObjectiveOur objective was to evaluate changes in adult food security, dietary intake, and quality from baseline (2014) to follow-up (2016), and to assess the role of adult food security on dietary outcomes.DesignA multistate, longitudinal, quasi-experimental intervention with matched treatment and comparison design was used to evaluate treatment vs comparison group changes over time and changes in both groups over time.Participants/settingAdult food pantry clients (n = 617) completed a demographic food security survey, and up to three 24-hour dietary recalls at baseline (n = 590) and follow-up (n = 160).InterventionCommunity coaching served as the experimental component, which only “treatment” communities received, and a food council guide and food pantry toolkit were provided to both “treatment” and matched “comparison” communities.Main outcome measuresChange in adult food security status, mean usual intakes of nutrients and food groups, and Healthy Eating Index-2010 scores were the main outcome measures.Statistical analyses performedLinear mixed models estimated changes in outcomes by intervention group and by adult food security status over time.ResultsImprovements in adult food security score (–0.7 ± 0.3; P = .01), Healthy Eating Index-2010 total score (4.2 ± 1.1; P < .0001), and empty calories component score (3.4 ± 0.5; P <.0001) from baseline to follow-up were observed in treatment and comparison groups, but no statistically significant changes were found for adult food security status, dietary quality, and usual intakes of nutrients and food groups between the 2 groups over time. The intervention effect on dietary quality and usual intake changes over time by adult food security status were also not observed.ConclusionsFood pantry clients in treatment and comparison groups had higher food security and dietary quality at the follow-up evaluation of the Voices for Food intervention trial compared with baseline, despite the lack of difference among the groups as a result of the experimental coaching component. 相似文献
2.
贺利平 《实用中西医结合临床》2022,22(14)
目的 探讨胆囊结石合并胆总管结石(CBDS)术后患者复发情况及危险因素。方法 纳入114例2019年1月~2020年12月在本院行ECRP联合LC治疗的胆囊结石合并CBDS患者,回顾性分析其临床资料,根据所选患者ECRP联合LC术后随访1年内是否复发(REC)将其分为REC组(32例)和未REC组(82例)。回顾性统计胆囊结石合并CBDS术后患者REC情况,比较REC组和未REC组的临床资料,并分析胆囊结石合并CBDS术后患者REC的危险因素。结果 114例胆囊结石合并CBDS术后患者REC32例,发生率28.07%。胆囊结石合并CBDS术后患者REC的危险因素为胆道感染、胆道口括约肌切开、术者经验≤3年、胆道括约肌功能障碍(OR=4.170、4.047、3.568、3.367,P<0.05)。结论 胆囊结石合并CBDS术后患者REC的危险因素与胆道感染、胆道口括约肌切开、术者经验≤3年、胆道括约肌功能障碍密切相关,可据此针对性制定临床治疗及护理干预措施方案,以降低胆囊结石合并CBDS术后患者REC率。 相似文献
3.
4.
5.
目的:探讨经皮冠状动脉介入(PCI)术后病人的体力活动水平及其影响因素。方法:选择常州市三级甲等综合医院心内科接受PCI治疗的冠心病病人,收集资料,分析PCI术后冠心病病人体力活动动机、体力活动和自我效能现状;冠心病病人自我效能、体力活动动机与体力活动的相关性,并分析影响PCI术后病人体力活动水平的相关危险因素。结果:共发放调查问卷400份,回收400份,有效率为94.75%(379/400);379例冠心病病人术后每周体力活动为(3570.85±314.19)MET-min,以低、中强度为主;冠心病病人术后自我效能总分、体力活动动机总分与体力活动呈正相关(P<0.05);体质指数(BMI)、PCI次数≥2次、年龄、PCI支架数量≥3枚、自我效能、体力活动动机是影响PCI术后冠心病病人体力活动水平的高危因素(OR>1且P<0.05)。结论:PCI术后病人体力活动水平处于较低的水平,PCI次数、BMI、年龄、PCI支架数量、自我效能、体力活动动机是影响PCI术后冠心病病人体力活动水平的高危因素,临床需针对各高危因素制定相应的干预措施,提高病人体力活动水平。 相似文献
6.
Virginija Pokut Rta Kazlauskait Irmina Matonyt 《Health & social care in the community》2022,30(1):193-202
Demographic situation, changes in the role of women in society and growing demand for long-term care (LTC) of older people have challenged the ability to meet the growing LTC needs in most developed countries. In countries where responsibility for LTC is still largely laid on families, it is, however, even more critical and calls for improvements in formal LTC systems. More intensive stakeholder collaboration in LTC policy development, organising and delivery are of primary importance in improving LTC systems. Such collaboration, however, is not always successful; thus, it is critical to understand what makes it effective and efficient. In this paper, we specifically look into multistakeholder collaboration in LTC in Lithuania, one of the fastest ageing countries in the EU, with the demand for LTC services growing fast and exceeding the supply despite rising business and NGO engagement. To determine facilitators of such collaboration, we build on the data obtained through eight focus group discussions with all key stakeholder representatives (LTC policymakers, organisers and service providers [public, private and NGOs], 54 participants in total). Our findings indicate that in addition to national and organisational level facilitators studied in prior research, there are important individual level factors, such as meaningfulness at work, concern and care for others, possibility for personal growth and development, satisfaction with supervision, a sense of belonging and role clarity. On the other hand, our results show that collaboration is constrained by a shortage of human resources, increased workload caused by growing LTC demand, bureaucratic requirements, legal restrictions, lack of awareness of LTC service availability among elder persons, and prevailing social norms and attitudes to institutionalised care. Interestingly, a lack of financial resources is not perceived as a major constraint. 相似文献
7.
8.
9.