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   10994篇
  免费   1039篇
  国内免费   56篇
耳鼻咽喉   99篇
儿科学   372篇
妇产科学   322篇
基础医学   1464篇
口腔科学   195篇
临床医学   1086篇
内科学   2462篇
皮肤病学   158篇
神经病学   936篇
特种医学   311篇
外科学   1402篇
综合类   282篇
一般理论   11篇
预防医学   1102篇
眼科学   235篇
药学   670篇
中国医学   28篇
肿瘤学   954篇
  2024年   13篇
  2023年   128篇
  2022年   154篇
  2021年   457篇
  2020年   292篇
  2019年   442篇
  2018年   474篇
  2017年   310篇
  2016年   313篇
  2015年   385篇
  2014年   536篇
  2013年   645篇
  2012年   921篇
  2011年   938篇
  2010年   499篇
  2009年   397篇
  2008年   643篇
  2007年   677篇
  2006年   600篇
  2005年   546篇
  2004年   454篇
  2003年   411篇
  2002年   386篇
  2001年   168篇
  2000年   146篇
  1999年   99篇
  1998年   62篇
  1997年   47篇
  1996年   43篇
  1995年   37篇
  1994年   34篇
  1993年   43篇
  1992年   69篇
  1991年   66篇
  1990年   87篇
  1989年   57篇
  1988年   54篇
  1987年   58篇
  1986年   43篇
  1985年   56篇
  1984年   43篇
  1983年   34篇
  1982年   24篇
  1981年   17篇
  1980年   22篇
  1979年   17篇
  1978年   21篇
  1976年   17篇
  1974年   13篇
  1973年   13篇
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
1.
2.
While peer support has been investigated in multiple clinical contexts, its application to the postpartum setting is unknown. The aim was to assess acceptability of a postpartum peer support program for women with diabetes. Observational survey-based needs assessment of forty low-income women with diabetes, receiving care at a major medical institution. Mean age and gravidity were 30.7 years and 3.15 ± 1.67 respectively. 45 % expressed interest in a “buddy.” There was no significant difference between groups desiring and not desiring this program. A majority of respondents desired telephone, text messaging, and in-person contacts (79.2, 72.1, 83.8 %), with 72.5 % of patients desiring diabetes-related activities during clinic waiting time. Many women desire a postpartum diabetes reciprocal peer program for support outside of clinician visits. Patients are receptive to educational services during their wait and outside of clinic time, a potentially valuable opportunity to share important health information.  相似文献   
3.
4.
5.
Maternal and Child Health Journal - Background Prenatal substance use screening is recommended. The 4 P’s Plus screener includes questions on perceived problematic substance use in parents...  相似文献   
6.
7.
8.
9.
10.
Motion is a major confound in diffusion‐weighted imaging (DWI) in the body, and it is a common cause of image artefacts. The effects are particularly severe in cardiac applications, due to the nonrigid cyclical deformation of the myocardium. Spin echo‐based DWI commonly employs gradient moment‐nulling techniques to desensitise the acquisition to velocity and acceleration, ie, nulling gradient moments up to the 2nd order (M2‐nulled). However, current M2‐nulled DWI scans are limited to encode diffusion along a single direction at a time. We propose a method for designing b‐tensors of arbitrary shapes, including planar, spherical, prolate and oblate tensors, while nulling gradient moments up to the 2nd order and beyond. The design strategy comprises initialising the diffusion encoding gradients in two encoding blocks about the refocusing pulse, followed by appropriate scaling and rotation, which further enables nulling undesired effects of concomitant gradients. Proof‐of‐concept assessment of in vivo mean diffusivity (MD) was performed using linear and spherical tensor encoding (LTE and STE, respectively) in the hearts of five healthy volunteers. The results of the M2‐nulled STE showed that (a) the sequence was robust to cardiac motion, and (b) MD was higher than that acquired using standard M2‐nulled LTE, where diffusion‐weighting was applied in three orthogonal directions, which may be attributed to the presence of restricted diffusion and microscopic diffusion anisotropy. Provided adequate signal‐to‐noise ratio, STE could significantly shorten estimation of MD compared with the conventional LTE approach. Importantly, our theoretical analysis and the proposed gradient waveform design may be useful in microstructure imaging beyond diffusion tensor imaging where the effects of motion must be suppressed.  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