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   57804篇
  免费   3477篇
  国内免费   391篇
耳鼻咽喉   206篇
儿科学   1735篇
妇产科学   827篇
基础医学   3392篇
口腔科学   1185篇
临床医学   7489篇
内科学   7305篇
皮肤病学   462篇
神经病学   3003篇
特种医学   634篇
外科学   3084篇
综合类   6139篇
现状与发展   2篇
一般理论   4篇
预防医学   20169篇
眼科学   295篇
药学   2852篇
  52篇
中国医学   941篇
肿瘤学   1896篇
  2024年   524篇
  2023年   1200篇
  2022年   2276篇
  2021年   2927篇
  2020年   2741篇
  2019年   3574篇
  2018年   3134篇
  2017年   2249篇
  2016年   1679篇
  2015年   1834篇
  2014年   4095篇
  2013年   4085篇
  2012年   3562篇
  2011年   3845篇
  2010年   2960篇
  2009年   2832篇
  2008年   2770篇
  2007年   2598篇
  2006年   1957篇
  2005年   1348篇
  2004年   1115篇
  2003年   898篇
  2002年   752篇
  2001年   641篇
  2000年   549篇
  1999年   461篇
  1998年   392篇
  1997年   292篇
  1996年   212篇
  1995年   232篇
  1994年   166篇
  1993年   164篇
  1992年   149篇
  1991年   107篇
  1990年   84篇
  1989年   86篇
  1988年   78篇
  1985年   306篇
  1984年   399篇
  1983年   320篇
  1982年   329篇
  1981年   317篇
  1980年   256篇
  1979年   245篇
  1978年   215篇
  1977年   157篇
  1976年   142篇
  1975年   122篇
  1974年   104篇
  1973年   80篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
91.
The main purpose of the National Nutrition and Health Systematic Survey for children 0-17 years of age in China (CNHSC) was to collect basic data on the nutrition, development, and health status for children in different regions across China using evidence-based, reliable, and cost-effective approaches. Children and their parents or guardians from seven regions (south, southwest, north, northwest, eastern, central, and northeast China) in China were recruited. A multi-stage stratified randomized sampling method was used. Two provinces were randomly sampled from each of the seven regions, from which one urban district and one rural country were also randomly sampled, resulting in a total of 28 survey counties/districts. Dietary surveys, health examinations, laboratory testing, and questionnaires were used to collect dietary intake, nutritional status, child development, and health status information. Nutrition, health, and lifestyle assessment of children and their parents was determined using the Knowledge Attitude Practice (KAP) survey. Greater than 100,000 children (38,000 children < 6 years of age and 66,000 children 6-17 years of age) completed the survey. The survey provided comprehensive data on child nutrition and health status for future studies and will serve as the basis for an integrated nutrition and health improvement strategies proposal for children in China.  相似文献   
92.
93.
Objectives: The Center for Disease Control began to assess Perceived Cognitive Impairment in 2009, yet there has been no in-depth study of how perceived decline in thinking or memory skills may be associated to the health and lifestyle of an independent community-dwelling older person. Among urban-dwelling older African Americans who are at elevated risk for cognitive impairment and dementia, we know even less regarding the interaction of these risk factors.Method: Five hundred and one African American elders (n = 501) between the ages of 55 and 95 with an average age of 70.73 years (SD = 8.6 years) participated in telephone interviews.Results: Approximately one-third of the elders reported that their memory, thinking skills, or ability to reason was worse than a year ago (n = 150; 29.9%) and 25% of this group (n = 38) reported that this Perceived Cognitive Impairment impacted their daily activities and/or warranted a consultation with their doctor. Bivariate analyses indicated that Perceived Cognitive Impairment was associated with increased health problems, mobility limitations, depressed mood, and lower social functioning.Conclusion: Elders who reported that cognitive problems impacted their daily functioning reported the greatest health and mental health problems. Perceived Cognitive Impairment is an important health variable with implications for an older adult's overall health, mobility, and mental health.  相似文献   
94.
目的探讨对独生子女精神分裂症患者进行健康教育干预,以期减少疾病复发,改善社会功能。方法通过阳性阴性量表及护理观察量表(NOSIE)对38例独生子女精神分裂症患者和38例非独生子女患者进行健康教育前后调查比较,利用灵活多变的护理健康教育形式对独生子女精神分裂症患者及其家属进行科学的健康教育。结果教育计划与治疗能降低患者住院时间,提高疗效,提高社会功能提高服药依从性。结论对独生子女进行科学的个性化健康教育方式,可提高患者的服药依从性与社会功能,降低复发率,对患者的回归社会有积极的影响。  相似文献   
95.
目的:研究亚低温治疗对心肺复苏后幸存者神经功能和预后的影响。方法118例心肺复苏幸存患者随机分入实验组和对照组,给予亚低温治疗和常规治疗,统计治疗数据,评价不同治疗方法对患者神经功能和预后效果的影响。结果实验组复苏后第1天、第2天、第4天和第6天的格拉斯哥昏迷指数及综合评分分别为2.31±0.24、3.09±0.32、3.75±0.52、4.62±0.65和3.76±0.45;对照组对应得分分别为0.87±0.13、1.54±0.42、2.46±0.63、2.96±0.58和2.74±0.52。结论亚低温疗法能够有效缓解患者心肺复苏后高灌注造成的二次伤害,促进患者神经功能的恢复,提高患者生活质量。  相似文献   
96.

Objective

EuroSCORE has been used in cardiac surgery operative risk assessment, despite important variables were not included. The objective of this study was to validate EuroSCORE on mortality prediction in a Brazilian cardiovascular surgery center, defining the influence of type of procedure and surgical team.

Methods

Between January 2006 and June 2011, 2320 consecutive adult patients were studied. According to additive EuroSCORE, patients were divided into low risk (score<2), medium risk (3 - 5), high risk (6 - 11) and very high risk (>12). The relation between observed mortality (O) and expected mortality (E) according to logistic EuroSCORE was calculated for each of the groups, types of procedures and surgeons with > 150 operations, and analyzed by logistic regression.

Results

EuroSCORE correlated to the observed mortality (O/E=0.94; P<0.0001; area under the curve 0.78). However, it overestimated the mortality in very high risk patients (O/E=0.74; P=0.001). EuroSCORE tended to overestimate isolated myocardial revascularization mortality (O/E=0.81; P=0.0001) and valve surgery mortality (O/E=0.89; P=0.007) and it tended to underestimate combined procedures mortality (O/E=1.09; P<0.0001). EuroSCORE overestimated surgeon A mortality (O/E=0.46; P<0.0001) and underestimated surgeon B mortality (O/E=1.3; P<0.0001), in every risk category.

Conclusion

In the present population, EuroSCORE overestimates mortality in very high risk patients, being influenced by type of procedure and surgical team. The most appropriate surgical team may minimize risks imposed by preoperative profiles.  相似文献   
97.
98.
99.
100.
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