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   872篇
  免费   37篇
  国内免费   8篇
耳鼻咽喉   10篇
儿科学   32篇
妇产科学   28篇
基础医学   77篇
口腔科学   6篇
临床医学   65篇
内科学   141篇
皮肤病学   12篇
神经病学   48篇
特种医学   146篇
外科学   57篇
综合类   54篇
预防医学   47篇
眼科学   41篇
药学   83篇
中国医学   1篇
肿瘤学   69篇
  2022年   6篇
  2021年   12篇
  2020年   11篇
  2019年   9篇
  2018年   9篇
  2017年   7篇
  2016年   5篇
  2015年   7篇
  2014年   14篇
  2013年   22篇
  2012年   35篇
  2011年   34篇
  2010年   26篇
  2009年   24篇
  2008年   34篇
  2007年   41篇
  2006年   39篇
  2005年   32篇
  2004年   33篇
  2003年   31篇
  2002年   17篇
  2001年   16篇
  2000年   25篇
  1999年   17篇
  1998年   34篇
  1997年   25篇
  1996年   24篇
  1995年   13篇
  1994年   20篇
  1993年   19篇
  1992年   19篇
  1991年   24篇
  1990年   23篇
  1989年   35篇
  1988年   25篇
  1987年   9篇
  1986年   10篇
  1985年   15篇
  1984年   7篇
  1983年   5篇
  1982年   6篇
  1981年   10篇
  1980年   8篇
  1978年   9篇
  1976年   4篇
  1966年   4篇
  1947年   4篇
  1943年   4篇
  1929年   3篇
  1926年   3篇
排序方式: 共有917条查询结果,搜索用时 15 毫秒
1.
This study qualitatively examined factors that influenced contraceptive choices in a sample of young, HIV-infected women. Individual qualitative interviews were conducted among 30 vertically and horizontally HIV-infected women (= 26 African American) from the ages of 14 to 24 years (Mean age = 20.9 years). We recruited sample groups with the following characteristics: (a) current contraceptive/condom use with ≥1 child (= 11); (b) current contraceptive/condom use with no children (= 12); and (c) no current contraceptive/condom use with no children (= 7). A semi-structured interview guide was used to ask participants about factors influencing past and current contraceptive choices. Individual interviews were digitally recorded and transcribed verbatim; analyses to identify core themes were informed by the Grounded Theoretical approach. Young, HIV-infected women did not identify their HIV serostatus or disease-related concerns as influential in their contraceptive decisions. However, they reported that recommendations from health-care providers and input from family and friends influenced their contraceptive choices. They also considered a particular method’s advantages (e.g., menstrual cycle improvements) and disadvantages (e.g., increased pill burden) when selecting a method. Findings suggested that HIV-infected young women’s contraceptive decisions were influenced by factors other than those related to their infection.  相似文献   
2.
3.
4.
5.
The receiver operating characteristic (ROC) method is a useful and popular tool for testing the efficiency of various diagnostic tests applicable to functional MRI (fMRI) data. Typically, the diagnostic tests are applied on simulated and pseudo-human fMRI data, and the area under the ROC curve is used as a measure of the efficiency of the diagnostic test. The effectiveness of such a method depends on how well the simulated data approximate the real data. For multivariate statistical methods, however, this technique is usually inadequate, as the spatial dependence among voxels is ignored for simulated data. In this work a modified ROC method using real fMRI data with a broader scope is proposed. This method can be applied to most fMRI postprocessing techniques, including multivariate analyses such as canonical correlation analysis (CCA). Also, the relationship of the modified ROC method with the conventional ROC method is discussed in detail.  相似文献   
6.
7.
8.
9.
10.
The incidence (%) of hyperbilirubinemia (serum bilirubin ≥257 μmol/l) was similar in neonates with a combination of ABO incompatibility and glucose-6-phosphate dehydrogenase (G-6-PD) deficiency (45%), with ABO incompatibility (54%) or G-6-PD deficiency (37%), alone (ns). Carboxyhemoglobin values, corrected for inspired CO, were similarly elevated in all three groups (0.87 ± 0.32%, 0.82 ± 0.29%, 0.76 ± 0.18%, respectively, ns), but correlated with bilirubin only in those with ABO incompatibility alone. ABO-incompatible/G-6-PD-deficient neonates, compared with those with either condition alone, are not at increased risk for hemolysis or hyperbilirubinemia.  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