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   23558篇
  免费   1966篇
  国内免费   849篇
耳鼻咽喉   191篇
儿科学   166篇
妇产科学   572篇
基础医学   1532篇
口腔科学   564篇
临床医学   3092篇
内科学   1472篇
皮肤病学   95篇
神经病学   839篇
特种医学   748篇
外科学   1532篇
综合类   4314篇
一般理论   5篇
预防医学   3710篇
眼科学   177篇
药学   3727篇
  76篇
中国医学   3206篇
肿瘤学   355篇
  2024年   170篇
  2023年   527篇
  2022年   1121篇
  2021年   1357篇
  2020年   1186篇
  2019年   887篇
  2018年   915篇
  2017年   978篇
  2016年   1041篇
  2015年   957篇
  2014年   1890篇
  2013年   2343篇
  2012年   1775篇
  2011年   1770篇
  2010年   1300篇
  2009年   1106篇
  2008年   1153篇
  2007年   1029篇
  2006年   864篇
  2005年   682篇
  2004年   571篇
  2003年   504篇
  2002年   348篇
  2001年   302篇
  2000年   254篇
  1999年   188篇
  1998年   161篇
  1997年   137篇
  1996年   125篇
  1995年   106篇
  1994年   85篇
  1993年   66篇
  1992年   80篇
  1991年   51篇
  1990年   52篇
  1989年   49篇
  1988年   36篇
  1987年   43篇
  1986年   21篇
  1985年   25篇
  1984年   20篇
  1983年   17篇
  1982年   18篇
  1981年   15篇
  1980年   15篇
  1979年   8篇
  1978年   7篇
  1977年   6篇
  1976年   3篇
  1973年   4篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
82.
The purpose of this study was to acquire a theoretical understanding of what it is like to work as a tactile massage therapist (TMT). There is insufficient knowledge in this area—despite increasing demand and implementation of tactile massage; so 26 female TMTs were interviewed (6 interview groups in Stockholm County). Grounded theory was used to analyse the data. The analysis resulted in a theoretical model that explains how TMTs individually underwent a transformation in which they learned about the energy-controlling system (energy takers, energy returners, and energy controllers) and managed to implement this demanding treatment, while maintaining health and inner balance in order to have total presence during treatment sessions. Results showed that total presence was crucial for implementing high-quality treatment, and inability to control energy may pose a risk to inner balance and health among TMTs.  相似文献   
83.
目的:比较冷牙胶侧加压充填技术与高温热塑充填技术根尖封闭效果。方法:选取离体颌牙40颗,随机分为A组(16颗牙)、B组(16颗牙)、实验阳性组(4颗牙)、实验阴性组(4颗牙),A组采用冷牙胶侧加压充填技术,B组采用高温热塑充填技术,比较分析不同组剐渗漏现象、顺应性、封闭性能。结果:高温热塑充填技术组渗入长度[(1.01±0.16)mm]明显少于冷牙胶侧方加压充填组;1.5、3.5mm横截面封闭能力、顺应性(0.9448±0.0221、0.9543±0.0200;0.9558±0.0164、0.9722±0.0142)、1.5、3.5mm横截面100~250封闭能力(0.9496±0.0168、0.95884-0.0176)、≥250封闭能力(0.9421±0.0165、0.9516±0.0214)明显高于冷牙胶侧方充填技术(P均〈0.05)。结论:高温热塑充填技术可以增强填充材料的顺应性,减少渗漏现象,提高封闲效果。  相似文献   
84.
介绍网真技术的特点,医院网真系统的设计架构和QoS的相关技术,讨论了在多院区环境下如何设计园区网络QoS,给出了配置参考方案,保障网真视频系统端到端的IP网络服务质量,充分发挥网真系统的先进性。  相似文献   
85.
乙烯装置的模拟需要有准确的裂解炉进料信息,而通过对进料系统的模拟计算可以从较易测得的原料信息得到所需的裂解炉进料信息。通过对某石化企业乙烯装置进料系统进行模拟,根据体系特点集成数据校正以解决流量测量数据的不平衡和不完整的问题,利用数据的空间冗余提高了模拟计算所用数据的准确性和可靠性,并针对体系的特殊性提出了数据校正过程中出现几类负值的处理方法,最后模拟得到所需的裂解炉进料性质数据。  相似文献   
86.
医院信息系统现有模式存在的问题是信息化在病房最终20米环节断裂导致信息的准确性难以保证,容易发生医疗行为偏差。通过对医院原来 HIS 系统功能进行加减法操作,实施移动医疗系统,引进全流程医疗数据“闭环”管理模式,能够有效优化操作流程、降低病房最终20米环节出现的医疗差错,提升患者服务水平。  相似文献   
87.
This articles serves as a guide to using cost-effectiveness analysis (CEA) to address health equity concerns. We first introduce the "equity impact plane," a tool for considering trade-offs between improving total health—the objective underpinning conventional CEA—and equity objectives, such as reducing social inequality in health or prioritizing the severely ill. Improving total health may clash with reducing social inequality in health, for example, when effective delivery of services to disadvantaged communities requires additional costs. Who gains and who loses from a cost-increasing health program depends on differences among people in terms of health risks, uptake, quality, adherence, capacity to benefit, and—crucially—who bears the opportunity costs of diverting scarce resources from other uses. We describe two main ways of using CEA to address health equity concerns: 1) equity impact analysis, which quantifies the distribution of costs and effects by equity-relevant variables, such as socioeconomic status, location, ethnicity, sex, and severity of illness; and 2) equity trade-off analysis, which quantifies trade-offs between improving total health and other equity objectives. One way to analyze equity trade-offs is to count the cost of fairer but less cost-effective options in terms of health forgone. Another method is to explore how much concern for equity is required to choose fairer but less cost-effective options using equity weights or parameters. We hope this article will help the health technology assessment community navigate the practical options now available for conducting equity-informative CEA that gives policymakers a better understanding of equity impacts and trade-offs.  相似文献   
88.
提出环境污染健康损害判定工作程序及步骤,给出已知污染物或未知污染物造成健康损害判定工作框图,并提出健康损害判定:①必须经环境保护主管部门进行资质认定的环境污染健康损害判定机构承担;②具有健康损害判定资质的机构应建立相应专家组;③健康损害判定专家组按相关标准根据医学诊断、环境证据及因果关系进行健康损害判定。  相似文献   
89.
The article presents the results of research on abrasive and tribocorrosion wear of boron steel. This type of steel is used in the automotive and agricultural industries for the production of tools working in soil. The main goal of the article is the evaluation of tribocorrosion and abrasive wear for hot-formed 22MnCrB5 steel and a comparison of the obtained results with test results for steel in a cold-formed state. The spinning bowl method to determine the wear of samples working in the abrasive mass was used. Furthermore, a stand developed based on the ball-on-plate system allows to determine the wear during the interaction of friction and corrosion. After the hot-forming process, 22MnCrB5 steel was three times more resistant for the abrasive wear than steel without this treatment. The average wear intensity for 22MnCrB5 untreated steel was 0.00046 g per km, while for 22MnCrB5 hot-formed steel it was 0.00014 g per km. The tribocorrosion tests show that the wear trace of hot-formed 22MnCrB5 steel was about 7.03 µm, and for cold-formed 22MnCrB5 steel a 12.11 µm trace was noticed. The hot-forming method allows to obtain the desired shape of the machine element and improves the anti-wear and anti-corrosion properties for boron steel.  相似文献   
90.
Sustainable fabrication of protective cotton, using bio-extracts, is becoming increasingly attractive. However, many shortcomings—including the introduction of potentially hazardous mordants or modifiers to cotton, annoying colour changes after finishing, and low processing efficiency—require further melioration. Therefore, an efficient ultrasonic-assisted colourless finishing process was developed in this study, to fabricate ultraviolet-proof and antimicrobial cotton. A pair of oppositely charged bio-based substances, i.e., tannin acid (TA) and hydroxypropyltrimethyl ammonium chloride chitosan (HACC) were introduced during the ultrasonic process. The results reveal that cationic HACC significantly promotes the adsorption of TA to cotton. The apparent colour of the cotton remained almost unchanged after finishing. Based on Pesudo first-/second-order kinetic models, chemisorption was verified as the dominant mechanism. Efficiency under ultrasound was enhanced by 5.3% (70 °C) and 27% (90 °C), respectively. A mathematical modelling study established the factors to be in the following order of significance: concentration > pH > temperature. Under optimal conditions, a theoretical maximum UPF of 380.8 was achieved. TA (8 g/L)-treated cotton deactivated up to 98% of Escherichia coli, and also provided excellent UV-shielding performance. In general, the ultrasonic-assisted eco-dyeing and finishing process for cotton was explored in depth from practical and theoretical perspectives, which should push forward the development of the sustainable textile industry.  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