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   4945531篇
  免费   381870篇
  国内免费   15629篇
耳鼻咽喉   69257篇
儿科学   158204篇
妇产科学   130189篇
基础医学   741647篇
口腔科学   137243篇
临床医学   454556篇
内科学   902368篇
皮肤病学   117242篇
神经病学   413867篇
特种医学   193629篇
外国民族医学   968篇
外科学   740779篇
综合类   139001篇
现状与发展   24篇
一般理论   2810篇
预防医学   413268篇
眼科学   115890篇
药学   352059篇
  26篇
中国医学   12985篇
肿瘤学   247018篇
  2021年   56923篇
  2019年   59367篇
  2018年   76192篇
  2017年   58440篇
  2016年   64823篇
  2015年   77302篇
  2014年   111761篇
  2013年   177481篇
  2012年   140458篇
  2011年   148387篇
  2010年   131059篇
  2009年   131048篇
  2008年   133718篇
  2007年   143550篇
  2006年   151137篇
  2005年   145337篇
  2004年   146153篇
  2003年   136015篇
  2002年   124555篇
  2001年   197257篇
  2000年   194218篇
  1999年   174325篇
  1998年   75887篇
  1997年   70603篇
  1996年   68774篇
  1995年   64345篇
  1994年   58187篇
  1993年   54006篇
  1992年   128579篇
  1991年   123387篇
  1990年   118828篇
  1989年   115371篇
  1988年   106269篇
  1987年   104323篇
  1986年   98428篇
  1985年   95832篇
  1984年   77794篇
  1983年   68476篇
  1982年   51629篇
  1981年   47719篇
  1980年   44740篇
  1979年   67694篇
  1978年   53056篇
  1977年   46617篇
  1976年   43244篇
  1975年   44064篇
  1974年   48996篇
  1973年   46942篇
  1972年   43935篇
  1971年   40622篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
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   
52.

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   
53.
54.
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   
55.
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   
56.
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   
57.
58.
59.
60.
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