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   4103698篇
  免费   287944篇
  国内免费   9351篇
耳鼻咽喉   57200篇
儿科学   134155篇
妇产科学   112437篇
基础医学   583815篇
口腔科学   117041篇
临床医学   376536篇
内科学   792698篇
皮肤病学   94940篇
神经病学   332616篇
特种医学   154426篇
外国民族医学   1152篇
外科学   610628篇
综合类   84460篇
现状与发展   15篇
一般理论   1635篇
预防医学   324338篇
眼科学   95386篇
药学   300970篇
  16篇
中国医学   8265篇
肿瘤学   218264篇
  2021年   33739篇
  2019年   34285篇
  2018年   47430篇
  2017年   35867篇
  2016年   40734篇
  2015年   46017篇
  2014年   64326篇
  2013年   96476篇
  2012年   130810篇
  2011年   139036篇
  2010年   82976篇
  2009年   78520篇
  2008年   128722篇
  2007年   136898篇
  2006年   138325篇
  2005年   133797篇
  2004年   128677篇
  2003年   123654篇
  2002年   118557篇
  2001年   184290篇
  2000年   189009篇
  1999年   159894篇
  1998年   47750篇
  1997年   41948篇
  1996年   42077篇
  1995年   40385篇
  1994年   37117篇
  1993年   34967篇
  1992年   125342篇
  1991年   121507篇
  1990年   118157篇
  1989年   114546篇
  1988年   105420篇
  1987年   103317篇
  1986年   97277篇
  1985年   93223篇
  1984年   69705篇
  1983年   59334篇
  1982年   35394篇
  1979年   63238篇
  1978年   44920篇
  1977年   37936篇
  1976年   35699篇
  1975年   38182篇
  1974年   45503篇
  1973年   43374篇
  1972年   40784篇
  1971年   38321篇
  1970年   35315篇
  1969年   33979篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
21.
22.
Vaccination is a vital health care initiative to prevent individual and population infection. To increase vaccination rates the federal government implemented the ‘No Jab, No Pay’ policy, where eligibility for several government benefits required children to be fully vaccinated by removing ‘conscientious objections’ and expanding the age range of children whose families receive benefits. This study assesses the impact of this policy at a local area within a single medical practice community in NSW, Australia. A retrospective clinical audit was performed between 2012 and 2017 on a single general practice's vaccination records for children ≤19 years. Catch-up vaccinations were assessed based on age at vaccination. Incidence of catch-up vaccinations was assessed for each of four years before and two years after the implementation of the ‘No Jab, No Pay’ policy in January 2016, along with the age of children and vaccination(s) given. Catch-up vaccinations were assessed temporally either side of implementation of ‘No Jab, No Pay’. Comparing the average annual vaccination catch-up incidence rate of 6.2% pre-implementation (2012–2015), there was an increase to 9.2% in 2016 (p < .001) and 7.8% in 2017 (p = .027). Secondary outcome measurement of catch-up vaccination incidence rates before (2012–2015) and after (2016–2017) ‘No Jab, No Pay’ implementation showed statistically significant increases for children aged 8–11 years (3.2%–5.6%, p = .038), 12–15 years (7.5%–14.7%, p < .001) and 16–19 years (3.3%–10.2%, p < .001) along with a statistically significant reduction in children aged 1–3 years (11.4%–6.2%, p = .015). Also, catch-up rates for DTPa significantly increased after program implementation. This study demonstrates that the Australian federal government vaccination policy ‘No Jab, No Pay’ was coincident with an increase in catch-up vaccinations within a rural NSW community served by one medical practice, especially for older children.  相似文献   
23.

Female Genital mutilation/cutting (FGM/C) is associated with enduring psychiatric complications. In this study, we investigate the rates of co-morbid abuses and polyvictimization experienced by survivors of FGM/C. This is a sub-analysis of a cohort study examining the patient population at the EMPOWER Center for Survivors of Sex Trafficking and Sexual Violence in New York City. A retrospective chart-review of electronic medical records was conducted for all consenting adult patients who had FGM/C and had an intake visit between January 16, 2014 and March 6, 2020. Of the 80 participants, ages ranged from 20 to 62 years with a mean of 37.4 (SD?=?9.1) years. In addition to FGM/C, participants were victims of physical abuse (43; 53.8%), emotional abuse (35; 43.8%), sexual abuse (35; 43.8%), forced marriage (20; 25%), child marriage (13; 16.3%), and sex trafficking (1; 1.4%). There was a high degree of polyvictimization, with 41 (51.2%) experiencing 3 or more of the aforementioned abuses. Having FGM/C on or after age 13 or having a higher total abuse score was also found to be strong predictors of depression and PTSD. The high rates of polyvictimization among survivors of FGM/C are associated with development of depression and PTSD. Despite co-morbid abuses, patients still attribute substantial psychiatric symptoms to their FGM/C. Health care providers should understand the high risk of polyvictimization when caring for this patient population.

  相似文献   
24.
Cancer Causes & Control - Congenital malformations are strong risk factors for childhood cancer. Our objective was to determine whether cancer survival differs by birth defect status among...  相似文献   
25.
26.
European Surgery - Treatment of pilonidal sinus disease (PSD) requires a&nbsp;tailored approach. A&nbsp;national guideline was published in 2014. The current status of surgical PSD therapy...  相似文献   
27.
In this paper we present a coupled Finite Element Method – Boundary Element Method (FEM-BEM) approach for the solution of the free-boundary axi-symmetric plasma equilibrium problem. The proposed method, obtained from an improvement of the Hagenow-Lackner coupling method, allows to efficiently model the equilibrium problem in unbounded domains by discretizing only the plasma region; the external conductors can be modelled either as 2D or 3D models, according to the problem of interest. The paper explores different iterative methods for the solution of the nonlinear Grad-Shafranov equation, such as Picard, Newton-Raphson and Newton-Krylov, in order to provide a robust and reliable tool, able to handle large-scale problems (e.g. high resolution equilibria). This method has been implemented in the FRIDA code (FRee-boundary Integro-Differential Axisimmetric – https://github. om/matteobonotto/ FRIDA), together with a suitable Adaptive Integration Technique (AIT) for the computation of the source term. FRIDA has been successfully tested and validated against experimental data from RFX-mod device, and numerical equilibria of an ITER-like device.  相似文献   
28.
29.
Journal of Neuro-Oncology - Adjuvant radiation is often used in patients with low grade gliomas with high-risk characteristics with a recommended dose of 45–54&nbsp;Gy. We used the...  相似文献   
30.
Maternal and Child Health Journal - Early life exposures can have an impact on a child’s developmental trajectory and children born late preterm (34–36&nbsp;weeks gestational age)...  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