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   10920篇
  免费   1526篇
  国内免费   44篇
耳鼻咽喉   105篇
儿科学   133篇
妇产科学   61篇
基础医学   570篇
口腔科学   416篇
临床医学   2485篇
内科学   3167篇
皮肤病学   45篇
神经病学   1391篇
特种医学   136篇
外科学   403篇
综合类   314篇
一般理论   2篇
预防医学   2267篇
眼科学   77篇
药学   458篇
  1篇
中国医学   35篇
肿瘤学   424篇
  2024年   39篇
  2023年   519篇
  2022年   509篇
  2021年   813篇
  2020年   777篇
  2019年   884篇
  2018年   762篇
  2017年   761篇
  2016年   640篇
  2015年   546篇
  2014年   644篇
  2013年   1276篇
  2012年   469篇
  2011年   456篇
  2010年   369篇
  2009年   415篇
  2008年   399篇
  2007年   345篇
  2006年   290篇
  2005年   252篇
  2004年   212篇
  2003年   176篇
  2002年   220篇
  2001年   180篇
  2000年   79篇
  1999年   73篇
  1998年   58篇
  1997年   58篇
  1996年   45篇
  1995年   28篇
  1994年   30篇
  1993年   18篇
  1992年   26篇
  1991年   17篇
  1990年   12篇
  1989年   13篇
  1988年   7篇
  1987年   6篇
  1986年   9篇
  1985年   7篇
  1984年   7篇
  1983年   7篇
  1982年   10篇
  1981年   8篇
  1979年   4篇
  1978年   4篇
  1977年   3篇
  1975年   3篇
  1971年   1篇
  1967年   1篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
22.
23.
24.
BackgroundGrowing research documents associations between neighborhood social cohesion with better health and well-being. However, other work has identified social cohesion's “dark side” and its ability to promote negative outcomes. It remains unclear if such diverging findings are attributable to differences in study design, or other reasons. To better capture its potential heterogeneous effects, we took an outcome-wide analytic approach to examine perceived neighborhood social cohesion in relation to a range of health and well-being outcomes.MethodsData were from 12,998 participants in the Health and Retirement Study—a large, diverse, prospective, and nationally representative cohort of U.S. adults age >50. Multiple regression models evaluated if social cohesion was associated with physical health, health behavior, psychological well-being, psychological distress, and social well-being outcomes. All models adjusted for sociodemographics, personality, and numerous baseline health and well-being characteristics. To evaluate the effects of change in cohesion, we adjusted for prior social cohesion. Bonferroni correction was used to account for multiple testing.ResultsPerceived neighborhood social cohesion was not associated with most physical health outcomes (except for reduced risk of physical functioning limitations and better self-rated health) nor health behavior outcomes (except for more binge drinking). However, it was associated with numerous subsequent psychosocial well-being (i.e., higher: positive affect, life satisfaction, optimism, purpose in life, mastery, health mastery, financial mastery; reduced likelihood of infrequent contact with friends) and psychological distress outcomes (i.e., lower depression, hopelessness, negative affect, loneliness) over the 4-year follow-up period.ConclusionsWith further research, these results suggest that perceived neighborhood social cohesion might be a valuable target for innovative policies aimed at improving well-being.  相似文献   
25.
Ageing in place raises pressing questions about medication practices at home. Understanding how medication practices are integrated into older adults’ domestic settings requires an interest in where activities linked to medication take place and why. This study aimed to describe the medication practices and spatial dimensions of medication management for home-dwelling older adults after hospital discharge, using a qualitative research design. Semi-structured interviews were carried out with ten older adults aged 65 years old or more and discharged home from hospital, together with nine informal caregivers. Thematic content analysis identified two main themes dealing with the spatial dimensions of medication management in this specific context: the process of integrating medication changes into routines and familiar spaces, and the individual and collective management of medication changes linked to a renegotiation of the boundaries between public and private spaces.  相似文献   
26.
27.
  1. Download : Download high-res image (227KB)
  2. Download : Download full-size image
  相似文献   
28.
Using the SF-12 to measure physical and mental functioning, the authors examine the intra-individual changes in health-related quality of life (HRQOL) 6 months post-discharge for depressed older adults. In addition, they examine three sets of predictors that might influence these changes. The sample of depressed older adults was recruited from an inpatient geropsychiatry unit. Although their physical and mental health scores on the SF-12 were lower than comparable norms, the sample showed an average increase in their mental functioning but a decrease in the physical functioning over the 6 months. Negative life-events were significant predictors of people who reported no change in their mental health functioning and decreases in their physical health functioning. Interestingly, those who experienced positive life events were more likely to report declines and younger participants were more likely to report no change in their physical functioning. The findings indicate that the effects of depression on HRQOL can have enduring effects on a sample of previously hospitalized older adults. The significance of life event changes might signify the importance of taking into account non-traditional areas of medical interventions. Further, the findings indicate the usefulness of the SF-12 quantifying HRQOL outcomes.  相似文献   
29.
Reluctance to use kidneys from older donors (>50 years of age) is based on reports of inferior results. We reviewed our experience with 45 kidneys transplanted from older donors. Primary nonfunction, immediate graft function, and 1-, 2- and 3-year graft survival rates were similar to those obtained with kidneys transplanted from donors aged between 20 and 40 years. Renal function at 1 year (as measured by serum creatinine) was poorer in kidneys from older donors. No beneficial effect with respect to graft survival was noted with cyclosporin therapy compared to conventional immunosuppression; however, the numbers are small. We conclude that kidneys from older donors are a valuable source for transplantation.  相似文献   
30.
The objective of this study is to determine whether a normal fetal morphology ultrasound scan in women older than 35 years reduces the risk of aneuploidy. We reviewed the results of amniocentesis and second trimester sonogram in all women older than 35 years from 1991 to 1995. None had prior screening. We excluded fetuses with structural anomalies. We determined the sensitivity and specificity of minor markers in detecting Down syndrome and also determined the reduction in risk of a normal sonogram. Among the 2060 women older than 35 years giving birth during the study period, 16 (0.78%) delivered an infant with Down syndrome. Of the 16 fetuses, two had no prenatal testing or ultrasound, two had invasive testing but no second trimester sonogram, five had a normal sonogram and seven had one or more sonographic markers of Down syndrome. At least 17% of women older than 35 years did not participate in prenatal testing or ultrasound. Ultrasound detected Down syndrome with a sensitivity of 59% (95% confidence interval: 45–72%), a false‐positive rate of 10.6% (9.4–11.8%) and a positive predictor value of 1 in 9. The likelihood of having normal karyotype if the sonogram was normal was 0.46 (0.31–0.61). In women older than 35 years, a normal second trimester sonogram reduces the risk of Down syndrome by more than 50%. At least 17% of women older than 35 years do not participate in prenatal testing or ultrasound.  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