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   137966篇
  免费   11487篇
  国内免费   6975篇
耳鼻咽喉   1262篇
儿科学   2262篇
妇产科学   1477篇
基础医学   15516篇
口腔科学   2791篇
临床医学   16221篇
内科学   19698篇
皮肤病学   2206篇
神经病学   7261篇
特种医学   5244篇
外国民族医学   28篇
外科学   13434篇
综合类   23750篇
现状与发展   23篇
一般理论   15篇
预防医学   11808篇
眼科学   3033篇
药学   14423篇
  83篇
中国医学   6617篇
肿瘤学   9276篇
  2024年   221篇
  2023年   1055篇
  2022年   2721篇
  2021年   3872篇
  2020年   2959篇
  2019年   2671篇
  2018年   3091篇
  2017年   3136篇
  2016年   3210篇
  2015年   4852篇
  2014年   6322篇
  2013年   7066篇
  2012年   10177篇
  2011年   10698篇
  2010年   8206篇
  2009年   7112篇
  2008年   8618篇
  2007年   8677篇
  2006年   8012篇
  2005年   7086篇
  2004年   5695篇
  2003年   5756篇
  2002年   4581篇
  2001年   5374篇
  2000年   4586篇
  1999年   3405篇
  1998年   1546篇
  1997年   1384篇
  1996年   937篇
  1995年   818篇
  1994年   697篇
  1993年   530篇
  1992年   1340篇
  1991年   1176篇
  1990年   1048篇
  1989年   1087篇
  1988年   971篇
  1987年   894篇
  1986年   807篇
  1985年   728篇
  1984年   449篇
  1983年   369篇
  1982年   219篇
  1981年   168篇
  1980年   137篇
  1979年   238篇
  1978年   117篇
  1973年   120篇
  1971年   111篇
  1970年   103篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Moderate sedatives have been increasingly used to improve patient comfort during flexible bronchoscopy (FB). However, routine use of moderate sedation during FB is controversial because its efficacy and safety are not well established.This study aims to evaluate the efficacy and safety of moderate sedation during FB.A search was made of Medline, EMBASE, and the Cochrane Library to May 2014.Randomized controlled trials (RCTs) and quasi-RCTs were included.The main analysis was designed to examine the efficacy of moderate sedation during FB in sedation than no-sedation.The willingness to repeat FB was significantly more in sedation than no-sedation (odds ratio [OR] 2.30; 95% confidence interval [CI] 1.11–4.73; P = 0.02; I2 = 22.5). The duration of FB was shorter in sedation group than no-sedation group (standardized mean difference [SMD] −0.21; 95% CI −0.38 to −0.03; P = 0.02; I2 = 78.3%). Event of hypoxia was not significantly different between sedation and no-sedation groups (OR 0.86; 95% CI 0.42–1.73; P = 0.67; I2 = 0%). The SpO2 during procedure was not different between sedation and no-sedation groups (SMD −0.14; 95% CI −0.37 to 0.08; P = 0.21; I2 = 49.9%). However, in subgroup analysis without supplemental oxygen, the SpO2 was significantly lower in sedation than no-sedation group (SMD −0.45; 95% CI −0.78 to −0.11; P = 0.01; I2 = 0.0%).According to this meta-analysis, moderate sedation in FB would be useful in patients who will require repeated bronchoscopies as well as safe in respiratory depression. To our knowledge, although the various sedative drugs are already used in the real field, this analysis was the first attempt to quantify objective results. We anticipate more definite and studies designed to elucidate standardized outcomes for moderate sedation in FB.  相似文献   
2.
3.
2013年5月至2014年2月对解放军107医院收治的80例腺样体肥大患者采用吸痰管牵拉软腭暴露鼻咽部,并在70°鼻内镜辅助下行肥大腺样体切除术,效果良好,现报告如下。1资料与方法1.1临床资料本组80例中,男43例,女37例,5~13岁,平均7岁,病程9个月~4年。临床症状均有不同程度夜寐打鼾、张口呼吸,伴有鼻塞。其中  相似文献   
4.
5.
BackgroundHepatopancreatobiliary (HPB) surgery fellowship training has multiple paths. Prospective trainees and employers must understand the differences between training pathways. This study examines self-reported fellowship experiences and current scope of practice across three pathways.MethodsAn online survey was disseminated to 654 surgeons. These included active Americas Hepato-Pancreato-Biliary Association (AHPBA) members and recent graduates of HPB, transplant–HPB and HPB–heavy surgical oncology fellowships.ResultsA total of 416 (64%) surgeons responded. Most respondents were male (89%) and most were practising in an academic setting (83%). 290 (70%) respondents underwent formal fellowship training. Although fellowship experiences varied, current practice was largely similar. Minimally invasive surgery (MIS) and ultrasound were the most commonly identified areas of training deficiencies and were, respectively, cited as such by 47% and 34% of HPB-, 49% and 50% of transplant-, and 52% and 25% of surgical oncology-trained respondents. Non-HPB cases performed in current practice included gastrointestinal (GI) and general surgery cases (56% and 49%, respectively) for HPB-trained respondents, transplant and general surgery cases (87% and 21%, respectively) for transplant-trained respondents, and GI surgery and non-HPB surgical oncology cases (70% and 28%, respectively) for surgical oncology-trained respondents.ConclusionsFellowship training in HPB surgery varies by training pathway. Training in MIS and ultrasound is deficient in each pathway. The ultimate scope of non-transplant HPB practice appears similar across training pathways. Thus, training pathway choice is best guided by the training experience desired and non-HPB components of anticipated practice.  相似文献   
6.
This study utilizes a psychophysical approach to examine the effects on carrying capacity for bi-manual carrying tasks involving different handle positions and carrying ranges. A total of 16 female subjects participated in the experiment in groups of two people, and each group of subjects performed the tasks in a random order with 12 different combinations of carrying task. The independent variables are handle position (upper, middle, lower) and carrying range (F–F: floor height carried to floor height, F–W: floor height carried to waist height, W–W: waist height carried to waist height, W–F: waist height carried to floor height), the dependent variable is the maximum acceptable carried weight (MAWC), heart rate (HR), and the rating of perceived exertion (RPE). The results show that the handle position has a significant effect on MAWC and overall RPE but no significant effect on HR. Carrying range has a significant effect on the MAWC and HR, but no significant effect on overall HR. The handle position and carrying range have a significant interaction on the MAWC and HR. The RPE for different body parts shows significant differences, and the hands feel the most tired. Overall, this study confirms that the lower handle position with the W–W carrying range is the best combination for a two-person carrying task.  相似文献   
7.
8.
9.
10.
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