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   14759篇
  免费   1567篇
  国内免费   206篇
耳鼻咽喉   201篇
儿科学   410篇
妇产科学   257篇
基础医学   828篇
口腔科学   762篇
临床医学   2312篇
内科学   1945篇
皮肤病学   273篇
神经病学   894篇
特种医学   222篇
外国民族医学   1篇
外科学   971篇
综合类   1517篇
现状与发展   1篇
一般理论   1篇
预防医学   3882篇
眼科学   323篇
药学   884篇
  32篇
中国医学   451篇
肿瘤学   365篇
  2024年   37篇
  2023年   285篇
  2022年   409篇
  2021年   699篇
  2020年   677篇
  2019年   611篇
  2018年   585篇
  2017年   622篇
  2016年   531篇
  2015年   549篇
  2014年   999篇
  2013年   1327篇
  2012年   926篇
  2011年   1001篇
  2010年   778篇
  2009年   785篇
  2008年   792篇
  2007年   796篇
  2006年   658篇
  2005年   547篇
  2004年   383篇
  2003年   343篇
  2002年   295篇
  2001年   257篇
  2000年   195篇
  1999年   153篇
  1998年   169篇
  1997年   174篇
  1996年   136篇
  1995年   93篇
  1994年   114篇
  1993年   91篇
  1992年   85篇
  1991年   71篇
  1990年   52篇
  1989年   42篇
  1988年   51篇
  1987年   34篇
  1986年   22篇
  1985年   35篇
  1984年   17篇
  1983年   15篇
  1982年   17篇
  1981年   13篇
  1980年   13篇
  1979年   12篇
  1978年   15篇
  1977年   6篇
  1976年   6篇
  1975年   3篇
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
51.
Assessment of autonomic dysfunction in Parkinson's disease: the SCOPA-AUT.   总被引:2,自引:0,他引:2  
We developed a questionnaire to assess autonomic symptoms in patients with Parkinson's disease (PD) and evaluated its reliability and validity. Based on the results of a postal survey in 46 PD patients, 21 multiple system atrophy patients, and 8 movement disorders specialists, items were included according to their frequency, burden, and clinical relevance. The questionnaire was evaluated in 140 PD patients and 100 controls, and test-retest reliability was established in a sample of 55 PD patients. The SCOPA-AUT consists of 25 items assessing the following regions: gastrointestinal (7), urinary (6), cardiovascular (3), thermoregulatory (4), pupillomotor (1), and sexual (2 items for men and 2 items for women) dysfunction. Test-retest reliability was good. Autonomic problems increased significantly with increasing disease severity for all autonomic regions, except sexual dysfunction. We conclude that SCOPA-AUT is a reliable and valid questionnaire that evaluates autonomic dysfunction in PD.  相似文献   
52.
三峡地区大学生膳食调查与分析   总被引:7,自引:0,他引:7  
目的:为开展大学生膳食营养教育提供依据。方法:采用记录和询问相结合的方法对301名大学生进行膳食调查。结果:男生的膳食营养状况比女生好。男生对热能、磷、铁、维生素A和维生素B1的摄入量均超过推荐量(Recommended Nutrient Intake,RNI),蛋白质达到RNI的94%,但钙、维生素B2和维生素C摄入不足,分别达到RNI的54%、71%、69%。女生磷、铁、维生素B1的摄取量超过RNI,维生素A达到RNI的90%,基本满足需要,但蛋白质、能量、钙、维生素B2和维生素C分别达到RNI量的76%、78%、57%和54%。男女生摄入的优质蛋白质均达到总摄入量的41%。男女生均有早上餐能量过低,晚餐量过高的现象。结论:大学生的膳营养水平比以往有所提高,但某些营养素仍严重缺乏,应加强对大学生的膳食营养教育。  相似文献   
53.
This study was designed to assess the reliability and validity of a Quality of Life (QOL) instrument on a sample of 179 allogeneic Bone Marrow Transplant (BMT) survivors. The QOL-BMT tool was developed specifically for this population and was based on the investigators' prior research and a conceptual model of Quality of Life. Patients who were at least 100 days post BMT completed the 30 item visual analogue questionnaire. The instrument measured physical symptoms (e.g., weight loss, frequent colds, skin changes, cataracts, sexual problems), psychological to illness, social concerns (e.g., relationship adjustment, return to work), and spiritual well-being (e.g., sense of control, future goals). Psychometric analysis of the instrument included measures of reliability and validity. The study findings demonstrate the unique aspects of QOL dimensions in BMT survivors and the value of QOL assessment in clinical practice and research.This study was supported by the City of Hope National Medical Center, NCI Cancer Center Core Grant, R30 CA 33572 and the City of Hope BRSG Grant Support.  相似文献   
54.
目的调查女性服刑人员精神创伤的特征。方法在湖南新路职业学校中,采用多级随机整群抽样的原则抽取471个女性服刑人员,分青少年组(年龄≤25岁)和成年组(〉25岁)。运用创伤性生活事件问卷(TLEQ)和访谈相结合的技术评估她们的精神创伤经历。结果(1)90.4%的女性服刑人员至少经历1件创伤性事件,63.7%至少经历3件或以上的多重创伤。青少年组的事件数量多于成年组(平均为4和3件,P〈0.01)。暴力和毒品相关犯罪组的事件数量相当(平均4件),都多于经济犯罪组(2件);中学或相当教育程度者的事件数量最多(4件),大专或以上者最少(2件);未婚、离婚/丧偶2组经历的事件数量最多(4件),已婚组最少(2件),均差异有显著性(P〈0.05)。(2)最多见的创伤类型是机动车祸(46.9%)、目睹家庭暴力(46.1%)和被抢劫(38.9%)。16.7%的女犯在18岁以前遭遇过性虐待。与成年组相比,青少年组经历了更多的创伤类型为被抢劫、目睹被惨打、目睹家庭暴力,以及儿童期性虐待。结论我国文化背景下,女性服刑人员的精神创伤经历相当普遍,是精神创伤的潜在受害者。  相似文献   
55.
抑郁症常见中医证候类型第一轮专家问卷分析   总被引:3,自引:0,他引:3  
目的 :调查抑郁症常见中医证候类型。方法 :根据文献资料和预试结果 ,编制抑郁症常见中医证候类型专家问卷 ,向全国范围内遴选出的 10 2位专家发放问卷调查。结果 :在回收的 92份问卷中 ,5 0 %以上的专家认定五类常见证候。结论 :肝郁气滞证、肝郁脾虚证、肝郁痰阻证、心脾两虚证、肝郁血瘀证是抑郁症的备选常见中医证候。  相似文献   
56.
医学生营养知识与膳食状况调查   总被引:7,自引:1,他引:6  
①目的了解医学生营养知识的掌握情况及对教育传播方式的需求意见,以加强营养知识教育,改善大学生的健康素质。②方法对762名在校大学生进行问卷调查。③结果医学院在校生对营养知识及常识掌握深度和广度都不够,但渴求得到营养知识的欲望比较高,对营养知识的重要性认识正确。有73.6%的学生认为营养知识对生活很重要。87.2%的学生愿意接受营养知识的教育,对营养知识教育的传播方式也表现出特有的需求意向。大学生的膳食结构不够合理,奶类、薯类、鱼虾禽类、豆制品摄入不足。④结论应加强医学生营养知识教育,使医学生做到科学合理的安排膳食,改善饮食行为,促进身体健康。  相似文献   
57.
We evaluated the influence of individually estimated portion sizes on the estimate of nutrient related risk of colorectal cancer, using data from a Portuguese hospital based case-control study on diet and colorectal cancer. A total of 100 patients with colorectal adenocarcinoma (aged 15-92 years) and 211 controls (aged 36-89 years) were included. Two data sets were created for nutrient analysis, the first one allowed estimates of food intake using data on portion size as collected with visual aids during the interview. The second estimate substituted respondents' estimate with a standard portion size, as used in the semi-quantitative (SQ) food frequency approach. The two analytic approaches yielded similar energy and nutrient intakes in cases and controls. The percent range of concordance is acceptable, in the same quartile varying from 44 to 82% (mean: 56%) and very good in the same or adjacent (+/-1) quartile (mean: 91%, range: 85-97%). The two estimates lead to a similar pattern of multivariate odd's ratio, however the SQ estimates resulted in more significant findings. We conclude that little extra information is gained by including individual portion size information when assessing diet-related risk of colorectal cancer.  相似文献   
58.
Summary. There is a need to bridge key gaps between high‐ and low‐income countries and individuals; between health policy and clinical practice; and between producers and users of healthcare technology and scientific evidence. The objective of this report was to perform a diagnosis of the situation in the developing world through a survey. This survey was conducted to gather specific information on various aspects related to haemophilia. Countries were chosen by their comparability in infant and adult mortality rates according to the regionalization proposed by the World Health Organization. These indicators are very sensitive to socioeconomic conditions, and have been widely used to study health inequalities. All regions, except Africa and the East Mediterranean, were represented. Africa was excluded because its indicators were not comparable. The East Mediterranean was not represented because of difficulties in contacting investigators. Twenty‐one country representatives were contacted, and 11 answered the questionnaire. Successes obtained by developing countries are based more on the skills and creativity of the local professionals than on the availability of state‐of‐the‐art technology. Frustrations were related to disease underregistration and the limited availability of treatment products. Haemophilia care in the developing world is not as fair as we would like it to be. Governments do not always cover treatment costs, and a very small percentage of the national health budgets is alotted to haemophilia care. The role of the World Federation of Hemophilia was considered crucial by all the investigators surveyed. Training programmes and supply of factor concentrates were the main contributions identified by the respondents.  相似文献   
59.
Nonmotor symptoms (NMS) of Parkinson's disease (PD) are not well recognized in clinical practice, either in primary or in secondary care, and are frequently missed during routine consultations. There is no single instrument (questionnaire or scale) that enables a comprehensive assessment of the range of NMS in PD both for the identification of problems and for the measurement of outcome. Against this background, a multidisciplinary group of experts, including patient group representatives, has developed an NMS screening questionnaire comprising 30 items. This instrument does not provide an overall score of disability and is not a graded or rating instrument. Instead, it is a screening tool designed to draw attention to the presence of NMS and initiate further investigation. In this article, we present the results from an international pilot study assessing feasibility, validity, and acceptability of a nonmotor questionnaire (NMSQuest). Data from 123 PD patients and 96 controls were analyzed. NMS were highly significantly more prevalent in PD compared to controls (PD NMS, median = 9.0, mean = 9.5 vs. control NMS, median = 5.5, mean = 4.0; Mann-Whitney, Kruskal-Wallis, and t test, P < 0.0001), with PD patients reporting at least 10 different NMS on average per patient. In PD, NMS were highly significantly more prevalent across all disease stages and the number of symptoms correlated significantly with advancing disease and duration of disease. Furthermore, frequently, problems such as diplopia, dribbling, apathy, blues, taste and smell problems were never previously disclosed to the health professionals.  相似文献   
60.
A marked proportion of primary care patients have mental disorders and problems that remain unrecognized by the patients and their general practitioners. There is furthermore a great variation in the physicians’ ability to detect mental disorders. The aim of the present study was to find out the overall prevalence of mental disorders among patients receiving primary health care. The material consisted of 1000 randomly selected adult patients attending primary care facilities in Turku. The mental disorders were assessed by using the Symptom Checklist (SCL-25) and by general practitioners. According to the SCL-25, one fourth of the sample had a mental disorder. Only two fifths of them could be identified by the general practitioners.  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