首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   8515篇
  免费   845篇
  国内免费   84篇
耳鼻咽喉   34篇
儿科学   90篇
妇产科学   48篇
基础医学   440篇
口腔科学   157篇
临床医学   1966篇
内科学   1162篇
皮肤病学   42篇
神经病学   539篇
特种医学   146篇
外科学   297篇
综合类   1201篇
一般理论   2篇
预防医学   2385篇
眼科学   62篇
药学   570篇
  6篇
中国医学   216篇
肿瘤学   81篇
  2024年   23篇
  2023年   228篇
  2022年   253篇
  2021年   411篇
  2020年   402篇
  2019年   430篇
  2018年   384篇
  2017年   414篇
  2016年   347篇
  2015年   309篇
  2014年   569篇
  2013年   688篇
  2012年   527篇
  2011年   546篇
  2010年   446篇
  2009年   467篇
  2008年   506篇
  2007年   467篇
  2006年   394篇
  2005年   314篇
  2004年   222篇
  2003年   190篇
  2002年   180篇
  2001年   145篇
  2000年   104篇
  1999年   94篇
  1998年   52篇
  1997年   56篇
  1996年   52篇
  1995年   32篇
  1994年   33篇
  1993年   26篇
  1992年   21篇
  1991年   21篇
  1990年   19篇
  1989年   13篇
  1988年   8篇
  1987年   14篇
  1986年   8篇
  1985年   6篇
  1984年   3篇
  1983年   2篇
  1982年   6篇
  1981年   4篇
  1980年   3篇
  1979年   1篇
  1978年   3篇
  1977年   1篇
排序方式: 共有9444条查询结果,搜索用时 31 毫秒
81.
82.
农村老年人心理健康状况的调查分析   总被引:10,自引:2,他引:10  
随着经济的发展和社会的进步 ,人口老龄化已经成为当今世界人口发展的一种必然趋势。因此 ,老龄问题日益受到关注。研究老年人的心理健康状况及其影响因素对如何提高老年人的生活质量具有重要的指导意义。国内已有一些学者对老年人的心理健康状况进行了研究[1- 7] ,但研究的对象主要是城市老年人 ,关于农村老年人的心理健康状况的研究极少。因此 ,本文想就这一问题作些探讨。1 对象与方法1.1 对象在湖州市所辖三县三区各抽取 9个行政村 ,每个行政村随机抽取 13~ 14个年龄在 6 0岁以上 (包括 6 0岁 )的老年农民进行调查 ,其中有 16人资料…  相似文献   
83.
84.
All citizens (N = 22066) aged 16 to 65 of a medium-sized Belgiantown were personally invited to CPR training sessions held intheir neighbourhood. 1152 responded by attending a trainingsession. Those who did not so respond were surveyed (randomsample N=600) for reasons of their not coming. The sample fittedwell with census data for gender, age and suburb location butnot for job, because retired persons and women at home wereover represented. 123 persons did not want to answer the questions. 116 personssaid they were already trained in CPR, 276 said they would accepton a future occasion and 82 said they would not. Three personsdid not answer this question. There was no discrimination for job, gender and suburb locationbetween those who did and did not accept a future training opportunity,nor was the existence of a heart patient among relatives. Theolder the person, the less inclined was that person to participatein CPR training (age effect x2 = 17.17, d.f. = 9, P<0.05).The 276 who accepted future training, chose their workplace(221) and/or their social meeting place (club etc.) as the placewhere this future training should be held. We suggest that CPR training is well accepted and that the trainingopportunities should be given at places of work and social gatherings.  相似文献   
85.
摘 要: 目的:探究中老年人颈动脉斑块与血清25羟维生素D (25-OH-D) 的相关性。 方法:选取2019年1月—2020 年 12 月自愿参与该研究的上海市浦东新区北蔡社区常住居民 412 人为研究对象,测定及记录其一般临床资料及血清 25-OH-D 等实验室检测结果。依据血管 B 超结果将研究对象分为有斑块组 268 人和无斑块组 144 人,比较两组人群血清 25-OH-D水平差异,用Pearson相关性分析各变量的关系,采用logistic回归分析颈动脉斑块形成的危险因素。结果:有斑块 组血清 25-OH-D 为 (45.18±18.71) nmol/L,无斑块组为 (56.12±19.54) nmol/L,两组差异有统计学意义 (χ2=5.573,P< 0.05)。相关性分析显示颈动脉斑块与收缩压、HbA1c、年龄呈正相关 (r值分别为0.388、0.119和0.128,P值均<0.05);与 血清 25-OH-D 呈负相关 (r=-0.365,P<0.01)。血清 25-OH-D 是颈动脉斑块形成的独立相关因素 (OR=0.973,95%CI: 0.960,0.985,P<0.05)。结论:低水平血清25-OH-D是颈动脉斑块形成的独立危险因素。  相似文献   
86.
Our aim was to assess the association between a priori defined dietary patterns and incident depressive symptoms. We used data from The Maastricht Study, a population-based cohort study (n = 2646, mean (SD) age 59.9 (8.0) years, 49.5% women; 15,188 person-years of follow-up). Level of adherence to the Dutch Healthy Diet (DHD), Mediterranean Diet, and Dietary Approaches To Stop Hypertension (DASH) were derived from a validated Food Frequency Questionnaire. Depressive symptoms were assessed at baseline and annually over seven-year-follow-up (using the 9-item Patient Health Questionnaire). We used Cox proportional hazards regression analyses to assess the association between dietary patterns and depressive symptoms. One standard deviation (SD) higher adherence in the DHD and DASH was associated with a lower hazard ratio (HR) of depressive symptoms with HRs (95%CI) of 0.78 (0.69–0.89) and 0.87 (0.77–0.98), respectively, after adjustment for sociodemographic and cardiovascular risk factors. After further adjustment for lifestyle factors, the HR per one SD higher DHD was 0.83 (0.73–0.96), whereas adherence to Mediterranean and DASH diets was not associated with incident depressive symptoms. Higher adherence to the DHD lowered risk of incident depressive symptoms. Adherence to healthy diet could be an effective non-pharmacological preventive measure to reduce the incidence of depression.  相似文献   
87.
BackgroundThe healthy eating index-2015 (HEI-2015) reflects diet quality in reference to the 2015-2020 Dietary Guidelines for Americans (DGA). Little is known regarding its application in individuals with chronic spinal cord injury (SCI).ObjectiveTo explore the relationship between diet quality as assessed by the HEI-2015 and cardiovascular risk factors among individuals with chronic SCI.DesignThis is a cross-sectional analysis of baseline data collected from August 2017 through November 2019 for an interventional study that evaluates the effects of a high-protein/low-carbohydrate diet on cardiovascular risk factors in individuals with chronic SCI at the University of Alabama at Birmingham.Participants/settingTwenty-four free-living adults with SCI (mean age, 45 ± 12 y; 8F/16M, level of injury: nine cervical, 15 thoracic; mean duration of injury: 20 ± 13 y) were included.Main outcome measuresParticipants underwent a 2-hour oral glucose tolerance test (OGTT) and a dual-energy x-ray absorptiometry scan. Dietary intake was assessed by three, 24-hour multiple-pass dietary recalls to calculate the HEI-2015 using the simple HEI scoring algorithm method.Data analysisMultiple linear regression analyses were performed to predict indices of lipid metabolism and glucose homeostasis and C-reactive protein (CRP) from the HEI-2015. Principal component analysis was used to reduce the number of covariates (level of injury, sex, and body fat percentage).ResultsOn average, participants’ diets were of low quality (HEI-2015, 47.2 ± 10.8). The regression models for fasting glucose (FG), cholesterol, high-density lipoprotein cholesterol, low-density lipoprotein cholesterol, and CRP had moderate to large effect sizes (adjusted R2 ≥ 13%), suggesting good explanatory abilities of the predictors. Small or limited effect sizes were observed for glucose tolerance, fasting insulin, triglycerides, and Matsuda index (adjusted R2 < 13%). The HEI-2015 accounted for a moderate amount of variation in FG (partial omega-squared, ωP2 = 13%). Each 10-point HEI-2015 score increase was associated with a 3.3-mg/dL decrease in FG concentrations. The HEI-2015 accounted for a limited amount of variation in other indices (ωP2 < 5%).ConclusionsAmong participants with SCI, higher conformance to the 2015-2020 DGA was 1) moderately associated with better FG homeostasis; and 2) trivially associated with other cardiovascular risk factors. Because of the small sample size, these conclusions cannot be extrapolated beyond the study sample. Future larger studies are warranted to better understand the relationship between diet quality and cardiovascular disease risks in this population.  相似文献   
88.
Within the United States South, the socio-religious norms that shape life for many residents may have public health implications. Drawing from 12 key informant interviews, this study explores the role of religious institutions in HIV care and prevention access among transgender people of color in Southern cities. Findings suggest that while religious anti-transgender stigma is pervasive, the regional importance of faith-based beliefs and institutions necessitates targeted faith-based initiatives for the population. Broadly, findings suggest regional environments may demand interventions that negotiate historically marginalizing relationships between at-risk groups and dominant cultural institutions.  相似文献   
89.
Using a relational approach, this study investigates whether shopping close to home moderates the relationship between the proximate food environment and diet. To address this question, we develop the proximate food retail quality (PFRQ) score, an inverse-distance weighted measure of all food retailers within a resident's neighborhood that incorporates audit data of each food retailer. This study relies on data collected through 24-h dietary recalls and psychosocial surveys administered to 449 adults in two socioeconomically matched neighborhoods. Food retailer audits collected data on the availability, price, and quality of healthful foods. Seventy-one percent of study participants report conducting at least 50% of their food shopping within approximately one mile of their home. Household income and education are associated with likelihood to shop close to home, while access to a personal vehicle is not. Finally, results suggest that, for residents who shop primarily close to home, a one unit increase in proximate food retail environment score is associated with a 17.2-point increase in HEI-2010 score, a measure of overall diet quality that ranges from zero to 100. This study suggests that the food environment matters for those who use it and that a low-quality proximate food environment can amplify individual disadvantage.  相似文献   
90.
在健康中国视域下,推进全科医学教育有着十分重要的意义,作为医疗院校以及医疗机构应当推进全科医学教育的人才培养,规范学科建设与发展。当下,全科医学教育健康机制刚刚起步,因此,作为教育工作者应当进一步完善教育体系,通过遵循市场和政策的引导,从而在健全全科医疗教育制度的同时,推动全科医学的发展,确保人民群众的生命健康。该文就健康中国视域下,全科医学教育发展方式进行探究,希望能够推动医疗服务可持续发展。  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号