全文获取类型
收费全文 | 14336篇 |
免费 | 972篇 |
国内免费 | 141篇 |
专业分类
耳鼻咽喉 | 68篇 |
儿科学 | 150篇 |
妇产科学 | 89篇 |
基础医学 | 705篇 |
口腔科学 | 197篇 |
临床医学 | 1204篇 |
内科学 | 1032篇 |
皮肤病学 | 116篇 |
神经病学 | 323篇 |
特种医学 | 144篇 |
外科学 | 474篇 |
综合类 | 2734篇 |
预防医学 | 3784篇 |
眼科学 | 73篇 |
药学 | 3403篇 |
31篇 | |
中国医学 | 626篇 |
肿瘤学 | 296篇 |
出版年
2024年 | 26篇 |
2023年 | 168篇 |
2022年 | 331篇 |
2021年 | 418篇 |
2020年 | 460篇 |
2019年 | 348篇 |
2018年 | 327篇 |
2017年 | 303篇 |
2016年 | 395篇 |
2015年 | 449篇 |
2014年 | 1212篇 |
2013年 | 1393篇 |
2012年 | 1546篇 |
2011年 | 1479篇 |
2010年 | 1271篇 |
2009年 | 940篇 |
2008年 | 773篇 |
2007年 | 740篇 |
2006年 | 553篇 |
2005年 | 454篇 |
2004年 | 309篇 |
2003年 | 247篇 |
2002年 | 195篇 |
2001年 | 166篇 |
2000年 | 137篇 |
1999年 | 127篇 |
1998年 | 92篇 |
1997年 | 79篇 |
1996年 | 63篇 |
1995年 | 50篇 |
1994年 | 47篇 |
1993年 | 32篇 |
1992年 | 22篇 |
1991年 | 38篇 |
1990年 | 20篇 |
1989年 | 30篇 |
1988年 | 18篇 |
1987年 | 20篇 |
1986年 | 15篇 |
1985年 | 20篇 |
1984年 | 20篇 |
1982年 | 16篇 |
1980年 | 9篇 |
1979年 | 7篇 |
1975年 | 9篇 |
1974年 | 11篇 |
1973年 | 15篇 |
1971年 | 8篇 |
1970年 | 6篇 |
1969年 | 6篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
92.
J. Alfonso Sanchez B. Sanchis Noguera M. J. Prado Del Baño A. Sabater Pons C. Saiz Sanchez P. Cortina Greus 《European journal of epidemiology》1993,9(1):33-39
The concept of avoidable cause of death serves as the basis for measuring the quality and diversity of a health care system. In this study the authors propose a new way to use this kind of mortality by combining with the concept of life expectancy to obtain what they call life expectancy free of avoidable mortality (LEFAM).This indicator was 76.9 in 1986 in Spain while life expectancy was 75.83. If these deaths were avoidable there would be a gain of 1.09 years per person born. There is an important difference between the would-be male gain of 1.76 years and the would-be female gain of 0.6. In the ecological study, LEFAM would better explain the year to year changes of the resources in the health sector, measured in terms of the human resources (R = 0.96), the hospital beds per thousand persons (R = –0.86), and would also increase the relation with other health indicators such as infant mortality rate (R = –0.98) and mortality rate (R = 0.59) as compared with life expectancy alone. 相似文献
93.
94.
Factor analysis, causal indicators and quality of life 总被引:1,自引:0,他引:1
Exploratory factor analysis (EFA) remains one of the standard and most widely used methods for demonstrating construct validity of new instruments. However, the model for EFA makes assumptions which may not be applicable to all quality of life (QOL) instruments, and as a consequence the results from EFA may be misleading. In particular, EFA assumes that the underlying construct of QOL (and any postulated subscales or factors) may be regarded as being reflected by the items in those factors or subscales. QOL instruments, however, frequently contain items such as diseases, symptoms or treatment side effects, which are causal indicators. These items may cause reduction in QOL for those patients experiencing them, but the reverse relationship need not apply: not all patients with a poor QOL need be experiencing the same set of symptoms. Thus a high level of a symptom item may imply that a patient's QOL is likely to be poor, but a poor level of QOL need not imply that the patient probably suffers from that symptom. This is the reverse of the common EFA model, in which it is implicitly assumed that changes in QOL and any subscales cause or are likely to be reflected by corresponding changes in all their constituent items; thus the items in EFA are called effect indicators. Furthermore, disease-related clusters of symptoms, or treatment-induced side-effects, may result in different studies finding different sets of items being highly correlated; for example, a study involving lung cancer patients receiving surgery and chemotherapy might find one set of highly correlated symptoms, whilst prostate cancer patients receiving hormone therapy would have a very different symptom correlation structure. Since EFA is based upon analyzing the correlation matrix and assuming all items to be effect indicators, it will extract factors representing consequences of the disease or treatment. These factors are likely to vary between different patient subgroups, according to the mode of treatment or the disease type and stage. Such factors contain little information about the relationship between the items and any underlying QOL constructs. Factor analysis is largely irrelevant as a method of scale validation for those QOL instruments that contain causal indicators, and should only be used with items which are effect indicators. 相似文献
95.
采用原子吸收分光光度法,测定了78 例肾小球疾病患儿血清铜、锌、铁、镁4 种元素。结果显示,单纯性肾病组、肾炎性肾病组、紫癜性肾病组及肾炎组血清锌均显著低于正常组( P< 005),血清铁、镁与正常组比较无显著差异。单纯性肾病组,肾炎性肾病组血清铜显著低于正常组( P< 005)。提示血清铜、锌、铁、镁含量的变化与疾病发生和疾病状态有关。 相似文献
96.
细菌L型的医院感染及其质粒谱分析研究 总被引:1,自引:0,他引:1
目的为了全面防止医院感染,我们对细菌L型的医院感染进行了研究。方法对医院内环境中800份标本及医院感染患者918份标本分离出的金黄色葡萄球菌L型、大肠埃希氏菌L型及铜绿假单胞菌L型进行了质粒谱分析和药敏试验。结果本院环境及医院感染患者细菌L型总检出率分别为19.0%和16.7%。不同来源的3种细菌L型的多重耐药性无显著性差异。不同来源3种细菌L型的同源性比例均较高,分别为90.3%、75.0%、84.2%。结论细菌L型医院感染患者的病原菌主要来自医院内环境 相似文献
97.
A G Lawthers B S Rózański R Nizankowski A Ry? 《International journal for quality in health care》1999,11(6):497-506
OBJECTIVE: To test the feasibility of using patient reported information to create indicators of quality (access, patient experience--including satisfaction, and clinical quality) with the goal of providing Kraków city clinic managers (and potentially other audiences) with information about the quality of outpatient care in selected clinics. Setting and methods. Almost 2,000 patients from 19 outpatient clinics in Kraków, Poland were surveyed in November and December 1997 and January 1998. We prepared a self-completed questionnaire to capture data about the patient's experience with access to services, interactions with registration staff, communication with the doctor, information received from the doctor, and receipt of preventive services. RESULTS: Access varied across clinics. For example, 84% of patients waited less than 10 minutes at registration, whereas only 53% of patients waited less than 30 minutes to see the doctor. Among those who tried to register by telephone, only 72% were successful. Satisfaction was highest with the doctor visit (satisfaction=79, on a scale of 1-100) and lowest with telephone registration (satisfaction = 59). Preventive health care screening was generally disappointing, particularly for Papanicolaou smear and clinical breast examination, although frequent users of a clinic (with more opportunities for screening) generally had higher rates of screening. CONCLUSION: We demonstrated the feasibility of constructing indicators of multiple dimensions of the quality of outpatient care using patient-reported information. Quality dimensions captured by survey included access, patient experience and clinical quality. Results were successfully summarized in easy to read and understand formats for clinic managers and city health department officials. 相似文献
98.
In this paper we use nonparametric mathematical programming models to compute and decompose Malmquist indices of productivity and quality change, which are used to evaluate the reforms in the UK National Health Service in the early nineties. We focus on acute hospitals and we study them over the first five years of the reforms. The findings of the study indicate that there was a productivity slowdown in the first year after the reforms but productivity progress in the subsequent years and thus, overall there was a net gain in productivity over the entire period considered. Productivity trends were dominated by technical change rather than hospital relative efficiency changes, as hospitals were already largely relatively efficient at the time of the introduction of the reforms. In fact, over the last four years in the period studied there was small relative efficiency regress and this does not bear out the argument that the reforms would increase hospital efficiency. The productivity changes are similar when service quality is incorporated in the analysis but the magnitude of these changes diminishes. Quality of service followed different trends to productivity change and this may have been the price for the productivity gains achieved. 相似文献
99.
目前临床检验中的固相化学法主要是多层膜法(Multiple Layer-Film),它集当代化学、光学、酶学、化学计量和计算机技术于一体,并已作为定量分析法达到常规湿化学法的测定水平。由于其具有准确度高、精密度高;标本量少;不需配制试剂操作简便、快速,可随时随地进行.无废液产生等优点,更适用于实验动物特别是小动物的体内生化成份测定。本项研究目的在于应用囿相化学法的优点以新西兰大耳兔为实验动物模型对兔血清中的ALT、AST、GLU、TB、BUN和Ca^2 进行分析测定,并应用临床化学分析法的选择和评价原理,在重复性实验、稀释实验、回收实验和方法比较实验等方面进行丁固相化学法对实验动物血清中生化成分测定的可行性实验探讨。 相似文献
100.
为探讨重复肝动脉化疗(TAE)对原发性肝癌(PHC)患者肝脏损伤的影响,对40例经3次TAE治疗的PHC患者和25例肝血管瘤患者(经1次TAE治疗)测定治疗前后透明质酸(HA),层粘连蛋白(LN),人Ⅲ型前胶原(HpcⅢ)和Ⅳ型胶原(Ⅳ·C)的含量。结果发现第2次TAE治疗后,上述4项指标TAE前后均有显著性差异(P<0.05),以第3次TAE后升高最为明显(P<0.01)。提示重复TAE治疗常可加重PHC患者的肝损害,应引起足够的重视。 相似文献