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   15880篇
  免费   1591篇
  国内免费   153篇
耳鼻咽喉   36篇
儿科学   552篇
妇产科学   188篇
基础医学   1531篇
口腔科学   293篇
临床医学   2744篇
内科学   1710篇
皮肤病学   45篇
神经病学   2764篇
特种医学   128篇
外科学   759篇
综合类   946篇
一般理论   22篇
预防医学   4469篇
眼科学   36篇
药学   817篇
  11篇
中国医学   95篇
肿瘤学   478篇
  2024年   76篇
  2023年   444篇
  2022年   498篇
  2021年   836篇
  2020年   860篇
  2019年   896篇
  2018年   792篇
  2017年   893篇
  2016年   758篇
  2015年   768篇
  2014年   965篇
  2013年   1936篇
  2012年   746篇
  2011年   747篇
  2010年   544篇
  2009年   587篇
  2008年   622篇
  2007年   594篇
  2006年   549篇
  2005年   442篇
  2004年   382篇
  2003年   366篇
  2002年   310篇
  2001年   247篇
  2000年   211篇
  1999年   174篇
  1998年   172篇
  1997年   144篇
  1996年   116篇
  1995年   110篇
  1994年   87篇
  1993年   99篇
  1992年   79篇
  1991年   72篇
  1990年   59篇
  1989年   66篇
  1988年   54篇
  1987年   44篇
  1986年   54篇
  1985年   45篇
  1984年   27篇
  1983年   23篇
  1982年   27篇
  1981年   12篇
  1980年   17篇
  1979年   15篇
  1977年   10篇
  1976年   12篇
  1975年   12篇
  1974年   8篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
Since 2010, adult social care spending in England has fallen significantly in real terms whilst demand has risen. Reductions in social care supply may also have impacted demand for NHS services, particularly for those whose care is provided at the interface of the health and care systems. We analyzed a panel dataset of 150 local authorities (councils) to test potential impacts on hospital utilization by people aged 65 and over: emergency admission rates for falls and hip fractures (“front‐door” measures); and extended stays of 7 days or longer; and 21 days or longer (“back‐door” measures). Changes in social care supply were assessed in two ways: gross current expenditure (per capita 65 and over) adjusted by local labor costs and social care workforce (per capita 18 and over). We ran negative binomial models, controlling for deprivation, ethnicity, age, unpaid care, council class, and year effects. To account for potential endogeneity, we ran instrumental variable regressions and dynamic panel models. Sensitivity analysis explored potential effects of funding for integrated care (the Better Care Fund). There was no consistent evidence that councils with higher per capita spend or higher social care staffing rates had lower hospital admission rates or shorter hospital stays.  相似文献   
72.
医学是什么?—对现代医学归属的思考   总被引:1,自引:1,他引:0  
什么是医学,从人的属性的多元化,医学的整体化、综合化发展趋势,以及现代医学与人文社会医学和艺术的密切关系,认为现代医学不应该属于自然科学;从医学的本质和人文社会医学的局限性来看,现代医学也不可能属于人文社会科学。提出:为了使生物医学和人文社会医学更好地交叉、融合,协调发展,从而达到医学的目的,完成医学所面临的任务,现代医学应该属于与自然科学和人文社会科学平行的,能独立发展又能相互渗透的科学领域。  相似文献   
73.
Percutaneous occlusion of the left atrial appendage is increasingly being used as an alternative for stroke prevention in patients with non‐valvular atrial fibrillation at high risk of complications from long term anticoagulation. We describe a case of left atrial appendage perforation during Watchman device implantation requiring emergency repair of the left atrium using sternotomy and cardiopulmonary bypass. Technical considerations for surgical decision making are discussed; in hemodynamically unstable patients as well as those at high risk for embolization.  相似文献   
74.
The buffering effect of social support on the negative effects of racism exposure on health outcomes has been mixed in prior studies regarding Asian Americans. Based on the stress-coping framework and using structural equation modelling (SEM) methods, we tested a theoretical model portraying simultaneous mediational paths from racism exposure to general physical and mental health through racism-related stress. Bootstrap analysis was used to test the indirect effects present in the model. Additionally, multi-group SEM analysis was conducted to investigate the moderation effect of social support from family and friends on the paths in the model. The sample consisted of 310 Asian American adults who completed an online survey. The results from the two-step SEM analysis and bootstrap analysis supported the theoretical model—racism exposure can simultaneously have a negative indirect effect on Asian Americans' physical and mental health via racism-related stress. Multi-group SEM analysis showed that there were no differences in model path coefficients based on having varying levels of social support from friends or family.  相似文献   
75.
76.
Remote interventions are increasingly used in transplant medicine but have rarely been rigorously evaluated. We investigated a remote intervention targeting immunosuppressant management in pediatric lung transplant recipients. Patients were recruited from a larger multisite trial if they had a Medication Level Variability Index (MLVI) ≥2.0, indicating worrisome tacrolimus level fluctuation. The manualized intervention included three weekly phone calls and regular follow-up calls. A comparison group included patients who met enrollment criteria after the subprotocol ended. Outcomes were defined before the intent-to-treat analysis. Feasibility was defined as ≥50% of participants completing the weekly calls. MLVI was compared pre- and 180 days postenrollment and between intervention and comparison groups. Of 18 eligible patients, 15 enrolled. Seven additional patients served as the comparison. Seventy-five percent of participants completed ≥3 weekly calls; average time on protocol was 257.7 days. Average intervention group MLVI was significantly lower (indicating improved blood level stability) at 180 days postenrollment (2.9 ± 1.29) compared with pre-enrollment (4.6 ± 2.10), = .02. At 180 days, MLVI decreased by 1.6 points in the intervention group but increased by 0.6 in the comparison group (= .054). Participants successfully engaged in a long-term remote intervention, and their medication blood levels stabilized. NCT02266888.  相似文献   
77.
ObjectiveTo assess whether patient socioeconomic status (SES) moderates the effectiveness of coordinated specialty care for first‐episode psychosis and to investigate possible mechanisms.Data SourcesA secondary analysis of data from the RAISE‐ETP Trial, which was conducted from 2010‐2014.Study DesignRAISE‐ETP was a cluster‐randomized trial comparing a coordinated specialty care (CSC) intervention called NAVIGATE with usual community care. We constructed a patient SES index based on parental education, parental occupational prestige, and race/ethnicity. After identifying correlates of SES, we used OLS regression analysis to estimate treatment effects on the major study outcomes across quartiles of the index. We also examined whether correlates of SES including the duration of untreated psychosis (DUP), and participation in NAVIGATE might account for the observed difference in effectiveness of CSC by SES.Principal FindingsThe trial sample had a similar SES distribution to the US population, and SES was positively correlated with all mental health outcomes and several potential moderators at baseline. CSC substantially improved the main trial outcomes compared to community care for patients in the highest SES quartile but had small and statistically insignificant benefits for the remaining 75% of patients. Intervention participation rates and several potential moderators did not explain this disparity.ConclusionsCSC may be more effective for high‐SES patients with early psychosis than low‐SES patients. Additional research is needed to understand why CSC is less effective for low‐SES patients and to develop methods to increase effectiveness for this subgroup.  相似文献   
78.
ObjectiveTo examine characteristics that are associated with receipt of Aid and Attendance (A&A), an enhanced pension benefit for Veterans who qualify on the basis of needing daily assistance, among Veterans who receive pensions.Data sourcesSecondary data analysis of 2016‐2017 national VA administrative data linked with Medicare claims.Study designObservational study examining sociodemographic, medical, and healthcare utilization characteristics associated with receipt of A&A among Veterans receiving pension.Principal findingsIn 2017, 9.7% of Veterans with pension newly received the A&A benefit. The probability of receiving A&A among black and Hispanic pensioners was 4.6 percentage points lower than for white pensioners (95%CI = −0.051, −0.042). Married Veterans receiving pension had a 4.4‐percentage point higher probability of receiving A&A (95%CI = 0.039, 0.048). Most indicators of need for assistance (eg, home health utilization, dementia, stroke) were associated with significantly higher probabilities of receiving A&A, with notable exceptions: pensioners with a diagnosis of Post‐Traumatic Stress Disorder (marginal effect = −0.029 95%CI = −0.037, −0.021) or enrolled in Medicaid (marginal effect = −0.053, 95%CI = −0.057, −0.050) had lower probabilities of receiving A&A. Unadjusted and adjusted rates of receiving A&A among Veterans receiving pension varied by VA medical center.ConclusionsThis study identified potential inequities in receipt of the A&A enhanced pension among a sample of Veterans receiving pension. Increased Veteran outreach, provider education, and VA office coordination can potentially reduce inequities in access to this benefit.  相似文献   
79.
A growing but limited body of research has identified the college student population as one that is particularly vulnerable to food insecurity. Early estimates of food insecurity prevalence among college students range from 14 to 60 per cent. The present study utilises original survey data collected from a random sample (n = 300) of college students enrolled at an urban university in the Midwest region of the United States of America (USA). This study examines the impact of food insecurity on health outcomes and the mediation of this relationship by subjective social status among college students. Ordinary least squares (OLS) and logistic regression analyses find that food insecurity is related to worse self-rated, physical and mental health among college students, and Sobel-Goodman tests find that subjective social status plays a significant mediating role in the relationship between food insecurity and health among college students. The implications of these findings in a university context are discussed using a psychosocial framework and insights from the stress process model. In doing so, I discuss food insecurity among college students with an emphasis on the social significance of food and food insecurity.  相似文献   
80.
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