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   1757篇
  免费   101篇
  国内免费   23篇
耳鼻咽喉   1篇
儿科学   161篇
妇产科学   17篇
基础医学   216篇
口腔科学   47篇
临床医学   166篇
内科学   371篇
皮肤病学   23篇
神经病学   76篇
特种医学   470篇
外科学   112篇
综合类   28篇
预防医学   58篇
眼科学   14篇
药学   57篇
中国医学   3篇
肿瘤学   61篇
  2022年   4篇
  2021年   7篇
  2020年   10篇
  2019年   8篇
  2018年   18篇
  2017年   11篇
  2016年   25篇
  2015年   29篇
  2014年   28篇
  2013年   66篇
  2012年   27篇
  2011年   32篇
  2010年   76篇
  2009年   59篇
  2008年   42篇
  2007年   30篇
  2006年   35篇
  2005年   28篇
  2004年   21篇
  2003年   20篇
  2002年   23篇
  2001年   14篇
  2000年   23篇
  1999年   28篇
  1998年   133篇
  1997年   118篇
  1996年   126篇
  1995年   93篇
  1994年   74篇
  1993年   83篇
  1992年   24篇
  1991年   25篇
  1990年   20篇
  1989年   68篇
  1988年   53篇
  1987年   54篇
  1986年   52篇
  1985年   48篇
  1984年   25篇
  1983年   32篇
  1982年   34篇
  1981年   20篇
  1980年   36篇
  1979年   14篇
  1978年   15篇
  1977年   17篇
  1976年   23篇
  1975年   24篇
  1971年   2篇
  1966年   2篇
排序方式: 共有1881条查询结果,搜索用时 187 毫秒
1.
2.
BACKGROUND: Our aims in the present study were to estimate the influences of pain and urinary symptoms on quality of life, and to determine which of these two variables has the most predictive power with respect to quality of life in young men with chronic prostatitis-like symptoms. METHODS: Chronic prostatitis-like symptoms were measured by the National Institutes of Health-Chronic Prostatitis Symptom Index. Of the 28,841 men aged 20 years who lived in the study community, 18,495 men (a response rate 64.1%) agreed to participate in the study. A total of 1057 men who complained of symptoms indicative of chronic prostatitis were included in the study. The influences of pain and urinary symptoms on quality of life were determined using logistic regression analysis. The receiver operating characteristic (ROC) curve was used to estimate the predictive ability of each of these variables with respect to quality of life. RESULTS: Results from multivariate analysis showed that both pain and urinary symptoms were associated with an increased likelihood of impaired quality of life, although pain contributed more to a reduced quality of life than urinary symptoms. Relative to men who experienced mild pain, men who experienced moderate pain had a 3.9-fold risk of poor quality of life (odds ratio [OR], 3.87; 95% confidence interval [CI], 2.86-5.23; P < 0.001) and those who experienced severe pain had a 15.7-fold risk of reduced quality of life (OR, 15.68; 95% CI, 6.59-37.35; P < 0.001). Moderate urinary symptoms were associated with a 1.4-fold risk of bother (OR, 1.41; 95% CI, 1.01-1.99; P < 0.001) and severe urinary symptoms were associated with 2.4-fold risk (OR, 2.39; 95% CI, 1.37-4.12; P < 0.001), relative to mild urinary symptoms. Comparison of the effects of pain and urinary symptoms showed that pain severity had the most predictive power for bother, quality of life, and quality-of-life impact. The areas under the ROC curves for bother, quality of life, and quality-of-life impact were 71.3%, 69.3% and 72.5%, respectively. CONCLUSION: Urinary symptoms and pain might be associated with an increased likelihood of impaired quality of life in young men with chronic prostatitis-like symptoms. In addition, our findings suggest that pain severity is the most influential variable for determining quality of life in this population.  相似文献   
3.
4.
The recent literature on economic issues of hospice care leaves several questions unanswered. The most important issue concerns how this type of care can be made financially attractive to patients and families for whom it is a medical option. A major study of a home-based pediatric hospice program permitted a more careful analysis than was previously feasible of the charges for hospice care and how those charges are paid. Data on provider utilization and duration in the program were obtained retrospectively on 177 patients. Costs of incidental expenditures and indirect costs were obtained prospectively from the families of 27 patients. A cost model was developed which is general enough to be used by other hospitals that might contemplate establishing a similar hospice program. Our findings are that insurance coverage, especially for publicly funded patients, is likely to be a major impediment for families deciding whether or not to use a hospice program at home.  相似文献   
5.
6.
Evaluation of an on-line patient exposure meter in neuroradiology   总被引:1,自引:0,他引:1  
  相似文献   
7.
Pediatric knee MR imaging: pattern of injuries in the immature skeleton   总被引:3,自引:0,他引:3  
  相似文献   
8.
9.
10.
Inversion recovery (IR), commonly considered a pulse sequence capable of producing T1-weighted images with excellent display of normal anatomy, is versatile: The null point and peak time provide a useful, succinct summary of the properties of IR and its capacity for producing both T1- and T2-weighted images. Shortening of the inversion time (TI) and creation of a short-TI inversion-recovery (STIR) pulse sequence increases sensitivity to malignancy and other abnormalities by making the effects of prolonged T1 and T2 on signal intensity additive and by nulling the signal from fat. The authors examined over 300 patients with various malignancies and compared STIR images with T1- and T2-weighted images obtained at 0.5 T. In 43 cases, signal-difference-to-noise ratios (SD/Ns) were calculated between tumor, fat, and muscle. In general, STIR images demonstrated tumor as a conspicuously high-intensity area in a background of muted, discernible anatomic detail. The good contrast achieved with STIR sequences between tumor and fat (SD/N = 18.1) and tumor and muscle (SD/N = 12.9) consolidated into a single image the information contained separately on T1- and T2-weighted images, which facilitates efficient detection and localization of malignancy.  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