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   29030篇
  免费   1701篇
  国内免费   1316篇
耳鼻咽喉   163篇
儿科学   190篇
妇产科学   372篇
基础医学   2533篇
口腔科学   886篇
临床医学   2551篇
内科学   3531篇
皮肤病学   336篇
神经病学   767篇
特种医学   894篇
外国民族医学   5篇
外科学   1972篇
综合类   7327篇
现状与发展   3篇
一般理论   1篇
预防医学   2346篇
眼科学   637篇
药学   2531篇
  2篇
中国医学   3139篇
肿瘤学   1861篇
  2024年   31篇
  2023年   190篇
  2022年   379篇
  2021年   588篇
  2020年   429篇
  2019年   381篇
  2018年   420篇
  2017年   407篇
  2016年   380篇
  2015年   571篇
  2014年   702篇
  2013年   700篇
  2012年   1122篇
  2011年   2034篇
  2010年   1310篇
  2009年   930篇
  2008年   1175篇
  2007年   1101篇
  2006年   1085篇
  2005年   1486篇
  2004年   2882篇
  2003年   2516篇
  2002年   2009篇
  2001年   1693篇
  2000年   1077篇
  1999年   1101篇
  1998年   753篇
  1997年   715篇
  1996年   416篇
  1995年   361篇
  1994年   436篇
  1993年   590篇
  1992年   521篇
  1991年   420篇
  1990年   213篇
  1989年   191篇
  1988年   156篇
  1987年   147篇
  1986年   149篇
  1985年   120篇
  1984年   61篇
  1983年   23篇
  1982年   16篇
  1981年   9篇
  1979年   8篇
  1978年   5篇
  1977年   6篇
  1975年   4篇
  1974年   5篇
  1965年   3篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
人工智能(Artificial Intelligence,AI)的蓬勃兴起为现代社会带来了前所未有的机遇,中医药是中华民族传承千年的文化瑰宝。随着人工智能技术不断在中医药领域的科技创新中崭露头角,二者的融合不断加深,人工智能在中医药领域的发展前景、争议挑战也引发了诸多思考。本文将从人工智能在中医药领域的应用入手,对人工智能辅助中医诊断、智能决策与数据挖掘、健康管理及中草药现代化研究等方面,就近年来国内外研究进展进行总结与分析,以期为AI视域下实现中医药现代化、智能化赋能。  相似文献   
2.
3.
4.
5.
目的 探讨阿戈美拉汀联合乙哌立松治疗青年慢性紧张性头痛(Chronictention-typeheadache,CTTH)的疗效及安全性.方法 80例青年慢性紧张性头痛患者依据是否倒班随机分为对照组和治疗组,对照组口服乙哌立松治疗,治疗组在对照组基础上联合阿戈美拉汀治疗,评估2组患者治疗前匹兹堡睡眠量表评分(PSQI)评估治疗6周后两组的头痛疗效以及不良反应.结果 倒班人员的入组前PSQI的总评分、睡眠质量、入睡时间、催眠药物及睡眠障碍因子分高于非倒班人员;治疗组的疗效优于对照组,有统计学意义(P<0.05);治疗组内,倒班患者疗效优于非倒班患者(P<0.05).两组不良反应无明显差异.结论 阿戈美拉汀联合乙哌立松治疗慢性紧张性头痛的的疗效确切,安全性高.  相似文献   
6.
本文回顾了Er:YAG激光活化根管冲洗技术的最新研究进展,包括光子诱导光声流(photon initiated photoacoustic streaming,PIPS)技术和冲击波增强发射光声流(shock wave enhanced emission photoacoustic streaming,SWEEPS)技术,探讨Er:YAG激光预处理桩道的原理、优点以及对纤维桩粘接强度的影响,以期为临床选择适宜的桩道处理方法提供新思路。  相似文献   
7.
Profilin 1 (PFN1) is a critical actin-regulatory protein; however, its functional role in hepatocellular carcinoma (HCC) progression remains to be further elucidated. In the present study, we observed that the expression levels of PFN1 were significantly decreased in HCC tissues and cell lines. Low PFN1 expression was significantly correlated with aggressive clinicopathological characteristics and poor prognosis of HCC patients. Further in vitro experiments demonstrated that overexpression of PFN1 remarkably inhibited the proliferation, migration, invasion and EMT of HCC cells. Moreover, we also found that PFN1 was a direct target gene of miR-19a-3p, and in HCC tissues, and there was a significantly inverse correlation between PFN1 mRNA and miR-19a-3p expression. Collectively, our results showed that PFN1 functions as a tumor suppressor in HCC, and might serve as a diagnostic and therapeutic target for HCC patients.  相似文献   
8.
9.
10.
Multidisciplinary predialysis education and team care (MDC) may slow the decline in renal function in patients with chronic kidney disease (CKD). However, associations between unexpected return during MDC and progression of renal dysfunction have not been characterized in patients with CKD. Our study aimed to determine the association between exacerbation of renal dysfunction and the frequency of unexpected return during follow-up.A total of 437 patients with CKD receiving multidisciplinary care between January 2009 and June 2013 at the Shin-Kong Wu Ho-Su Memorial Hospital were included in this retrospective observational cohort study, and multiple imputations were performed for missing data. The predictor was the frequency of unexpected return for follow-up during the first year after entering MDC. Main outcome was monthly declines in estimated glomerular filtration rates (eGFR). Moreover, the demographic data, comorbidities, history of medication, and routine laboratory data for patients with CKD were collected.Among all patients, 59.7% were male, the mean age at initiation of MDC was 69.4 ± 13.2 years, and the duration of follow-up was 21.4 ± 3.3 months. The subjects were divided into 2 groups according to frequencies of follow-up (≤4 and > 4 visits) during the 1st year of MDC. The patients with CKD were regularly followed up every 3 months as a part of MDC in our hospital, and patients who returned for more than 4 follow-up visits were included in the unexpected return group. In crude regression analyses, unexpected return was significantly associated with higher monthly declines of eGFR (β = 0.092, 95% confidence interval, 0.014–0.170). This association remained after adjustments for multiple variables, and subgroup analyses of unexpected return showed that male gender, older age, CKD stage 1 to 3, hypertension, history of coronary artery disease, and use of renin–angiotensin system blockade were significantly associated with declines in renal function.In conclusion, unexpected return for follow-up during the 1st year of MDC was significantly associated with the deterioration of renal function.  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