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   66848篇
  免费   5440篇
  国内免费   1951篇
耳鼻咽喉   475篇
儿科学   1405篇
妇产科学   2282篇
基础医学   6887篇
口腔科学   1729篇
临床医学   6428篇
内科学   6683篇
皮肤病学   861篇
神经病学   4246篇
特种医学   1643篇
外国民族医学   7篇
外科学   4683篇
综合类   9867篇
现状与发展   4篇
一般理论   26篇
预防医学   10288篇
眼科学   1740篇
药学   7509篇
  84篇
中国医学   4694篇
肿瘤学   2698篇
  2024年   130篇
  2023年   1083篇
  2022年   1399篇
  2021年   2738篇
  2020年   2585篇
  2019年   2365篇
  2018年   2263篇
  2017年   2250篇
  2016年   2203篇
  2015年   2147篇
  2014年   3980篇
  2013年   5056篇
  2012年   3924篇
  2011年   4352篇
  2010年   3496篇
  2009年   3076篇
  2008年   3003篇
  2007年   3001篇
  2006年   2700篇
  2005年   2395篇
  2004年   2044篇
  2003年   1992篇
  2002年   1487篇
  2001年   1413篇
  2000年   1137篇
  1999年   1100篇
  1998年   943篇
  1997年   917篇
  1996年   837篇
  1995年   812篇
  1994年   674篇
  1993年   568篇
  1992年   523篇
  1991年   470篇
  1990年   498篇
  1989年   417篇
  1988年   315篇
  1987年   262篇
  1986年   329篇
  1985年   460篇
  1984年   427篇
  1983年   264篇
  1982年   344篇
  1981年   274篇
  1980年   296篇
  1979年   216篇
  1978年   184篇
  1977年   171篇
  1976年   162篇
  1975年   116篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
目的:对上海市一所国有民营医院的平价病房进行案例调查,了解运行状况、经验及存在问题。方法:相关人员访谈和现场观察。结果:该院设立了14张床位的平价病房,收治对象是低保户、特困户及经济困难的外来务工人员。对医保病人和自费病人设定不同的减免优惠方案,包括减免50.0%的床位费和10.0%的护理、检查、治疗及手术等劳务费用(药费除外)。以收治急性病为主,住院时间原则上不超过2周。出院病人总费用的实际减免率约为6.0% ̄10.0%。结论:创办平价病房的方向应予肯定。是民营机构委托管理医院的一种公益性(非营利性)的表现,对其他公立医疗机构具有促进作用。  相似文献   
82.
肝癌间质及癌旁病变的病理分析   总被引:2,自引:0,他引:2  
目的 研究肝癌间质及癌旁病变的临床病理意义。方法 在 2 0例肝癌组织标本中取 45个癌结节 ,分别在癌结节中间、癌旁肝组织等部位取组织 4块 ,连续切片 ,显微镜下观察。结果  19个结节有完整窦内皮细胞围绕癌巢 ,其中癌结节肉眼小于3cm者 13个 ,大于 3cm者 6个。 2 6个癌结节无完整窦内皮细胞围绕癌巢 ,其中癌结节直径大于 3cm者 2 4个 ,小于 3cm者 2个。2 0例中有 13例合并肝硬化 ,17例有乙型肝炎病毒感染和HBsAg阳性。 结论 病理连续切片 ,显微镜下观察肝癌间质及癌旁病变是预测肝癌患者预后的重要病理学指标  相似文献   
83.
目的探讨治疗下肢静脉溃疡有效、简单的方法。方法清除下肢静脉溃疡分泌物及坏死组织,创面以胰岛素与庆大霉素混合液湿敷,创面清洁后行常规手术,术后继续用上述方法处理创面。结果全部溃疡创面在1 ̄6周内愈合,术后35例随诊最短4个月,最长6年无溃疡复发。结论下肢静脉性溃疡应早期手术,术前、术后用胰岛素和庆大霉素混合液湿敷溃疡创面是一种简单、安全、经济、治疗时间短的有效方法。  相似文献   
84.
为了解临床医学专业留学生和民族生较为严重的功课不及格的原因并寻求相应的对策,课题组于2005年12月进行了学生问卷调查,2006年4月对教师进行了半结构式访谈调查和访谈发现,学生的汉语水平和原有的学习基础、学习生活习惯、对学校教学管理制度和管理系统的熟悉程度、自学时间和学习努力程度、学校学院教师对待他们方式等是主要的影响因素;根据调查与访谈,课题组针对影响因素归纳出了相应的对策,  相似文献   
85.
BACKGROUND/AIMS: The purpose of this work was to develop a new sensor for objective in vivo measurement of the cutaneous temperature based on micro-electro-mechanical systems (MEMS), and to compare these performances with those of a classical thermocouple. Research on this new sensor was carried out to allow the quantification of the thermal properties of the made-up skin. METHODS: Sixteen female subjects divided into two different age groups (18-35 and >50 years old) were recruited for this study. Several zones of the face and forearms were made up at random with foundations containing or not a thermoregulator raw material. The quantity of foundation applied on the skin was standardized and measurements were carried out first before make-up, and then 10 s and 5 min after make-up. The new sensor and the thermocouple were used successively on each zone. The cutaneous temperature was expressed in degrees celsius. RESULTS/CONCLUSION: The two systems are similar in terms of repeatability and reproducibility, with some differences in sensibility. The data measured by the MEMS sensor appear lower than those measured by the thermocouple. After make-up, the MEMS sensor detects a progressive increase of the temperature in time whereas the thermocouple detects a decrease. We found the same evolution on the face but in a more attenuated way. These results tend to show that the devices do not measure the same phenomenon. The thermocouple appears more sensitive to the thermal response of the made-up surface whereas the MEMS sensor appears more sensitive to the heat transfers in the interface between the skin and make-up.  相似文献   
86.
Development of autoimmune hepatitis in primary biliary cirrhosis.   总被引:1,自引:0,他引:1  
AIM/BACKGROUND: Primary biliary cirrhosis (PBC) is a chronic cholestatic liver disease of unknown aetiology. Up to 10% of patients with typical features of PBC will have additional features of autoimmune hepatitis (AIH). A subset, however, have no such features but go on to develop a 'sequential' AIH overlap syndrome. Objectives: Describe our experience with eight patients who developed AIH after the diagnosis of PBC was made. METHODS: We reviewed the charts of all PBC patients over a 9-year period (from 1996 to 2005). Only PBC patients with no features of AIH were included. RESULTS: There were 1476 patients with PBC. Of these, eight patients developed features of AIH overlap syndrome based on biochemical and histological parameters. Treatment included prednisone and azathioprine for 24 or more months. The majority of patients remained on ursodeoxycholic acid (UDCA) throughout treatment. Response to therapy was defined by improvement in enzymes, and was rapid for all patients. One patient was able to discontinue treatment with prednisone and azathioprine, while seven have continued on therapy to date. CONCLUSIONS: A 'sequential' overlap syndrome of AIH with PBC can occur. Treatment with prednisone and azathioprine may lead to a rapid improvement in aminotransferase levels.  相似文献   
87.
As a consequence of the time-varying magnetic field induced by eddy currents, frequency drifting occurs when the sampling window of localized spectroscopy continuously shifts. The frequency drifting and the concomitant phase variations can severely affect spectroscopy results when data are acquired with multiple echo times (TEs), such as in the measurement of glutamate (Glu) concentration using the TE-averaged method. Specifically, the averaged spectra are further broadened and distorted in the presence of residual eddy currents, and editing of the coupled spins of Glu C4 protons is affected, resulting in errors in the measured relative intensity ratio. Postacquisition correction using unsuppressed water as reference can effectively minimize this detrimental effect, as manifested by the significantly enhanced signal intensity. Also, it is demonstrated that the methyl signals of creatine (Cr) at 3.0 ppm and choline (Cho) at 3.2 ppm can be used as internal references in finding frequency and phase disparities between different TEs.  相似文献   
88.
OBJECTIVE: . The aim of this study was to assess clinical staff's opinions on the results of in-patient satisfaction surveys and their use within the quality improvement process. SETTING: The institution is a 2200-bed teaching hospital of tertiary health care employing 8000 professionals. Patient satisfaction surveys are carried out each year using a validated questionnaire mailed to a random sample of patients. The specific results of each department are sent to the medical and paramedical managers. METHODS: We conducted a questionnaire survey on 500 care providers randomly selected in every medical and surgical department. RESULTS: A total of 261 questionnaires were returned and analysed. Overall, 94% of responders had a favourable opinion of the patient satisfaction surveys. They considered that the patient was able to judge hospital service quality, especially in its relational, organizational, and environmental dimensions. The specific results for the department were less well known than the overall hospital results (60 versus 76%). These results were formally discussed in the department according to 40% of responders; 40% declared that these data resulted in improvement actions and considered that they led to modifications in their behaviour with patients. CONCLUSIONS: Despite a declared interest in satisfaction surveys, the results remain underused by hospital staff and insufficiently discussed within teams.  相似文献   
89.
90.
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