全文获取类型
收费全文 | 384篇 |
免费 | 84篇 |
国内免费 | 12篇 |
专业分类
耳鼻咽喉 | 7篇 |
儿科学 | 5篇 |
妇产科学 | 4篇 |
基础医学 | 79篇 |
口腔科学 | 11篇 |
临床医学 | 57篇 |
内科学 | 28篇 |
皮肤病学 | 1篇 |
神经病学 | 29篇 |
特种医学 | 14篇 |
外科学 | 49篇 |
综合类 | 85篇 |
预防医学 | 36篇 |
眼科学 | 5篇 |
药学 | 24篇 |
中国医学 | 35篇 |
肿瘤学 | 11篇 |
出版年
2024年 | 3篇 |
2023年 | 30篇 |
2022年 | 37篇 |
2021年 | 46篇 |
2020年 | 34篇 |
2019年 | 18篇 |
2018年 | 16篇 |
2017年 | 23篇 |
2016年 | 19篇 |
2015年 | 12篇 |
2014年 | 21篇 |
2013年 | 15篇 |
2012年 | 18篇 |
2011年 | 32篇 |
2010年 | 24篇 |
2009年 | 18篇 |
2008年 | 18篇 |
2007年 | 16篇 |
2006年 | 13篇 |
2005年 | 12篇 |
2004年 | 11篇 |
2003年 | 8篇 |
2002年 | 4篇 |
2001年 | 6篇 |
2000年 | 3篇 |
1999年 | 2篇 |
1998年 | 3篇 |
1997年 | 3篇 |
1996年 | 3篇 |
1995年 | 2篇 |
1994年 | 3篇 |
1993年 | 3篇 |
1991年 | 1篇 |
1986年 | 1篇 |
1982年 | 1篇 |
1979年 | 1篇 |
排序方式: 共有480条查询结果,搜索用时 0 毫秒
51.
汤敏 《生物医学工程学杂志》2010,(2)
在网格计算基础上,研究利用医院内部局域网和普通配置计算机,实现超大规模医学图像并行可视化的关键技术,包括系统硬件构成、软件框架、负载平衡以及虚拟现实可视化等问题。在普通计算机群上,编程实现大规模医学图像的最大密度投影重建算法,并在虚拟现实构造语言(virtual reality modeling language,VRML)基础上,设计人机交互控制面板,实现虚拟可视化操作。仿真结果表明,该方法较好地解决了运算速度和内存空间这两大难题,效果良好,实时性强,对医生诊断治疗具有很好的辅助作用。 相似文献
52.
OBJECTIVE: Our objective was to examine patients' experiences of taking orlistat as a means to explore adherence and behavior change. METHOD: We performed qualitative interviews with 12 participants who had taken orlistat in the past 2 years. RESULTS: Their experiences were described in terms of beliefs about the causes of their obesity, their motivations for taking orlistat, and highly visual side effects. These themes have implications for understanding adherence and behavior change. For some, the side effects led to nonadherence and absence of behavior change. These individuals seemed to be motivated by routine effects of being overweight, such as lowered self-esteem. In contrast, those who were motivated by a life crisis seemed to tolerate the side effects of the drug, leading to adherence. In turn, these highly visual side effects enabled them to make an explicit link between food consumed and weight, creating a shift in their beliefs about the causes of obesity and making behavior change more likely. CONCLUSION: Orlistat use illustrates how treatment and illness beliefs interact to create both adherence and behavior change, particularly in the context of a life crisis and particularly when symptoms can be visualized. 相似文献
53.
Min Joo Choi Sitaramanjaneya Reddy Guntur Kang IL Lee Dong Guk Paeng Andrew Coleman 《Ultrasound in medicine & biology》2013
An optically transparent tissue-mimicking (TM) phantom whose acoustic properties are close to those of tissue was constructed for visualizing therapeutic effects by high intensity focused ultrasound (HIFU). The TM phantom was designed to improve a widely used standard bovine serum albumin (BSA) polyacrylamide hydrogel (PAG), which attenuated ultrasound far less than tissue and, unlike tissue, did not scatter ultrasound. A modified recipe has been proposed in the study by adding scattering glass beads with diameters of 40–80 μm (0.002% w/v) and by raising the concentration of acrylamide (30% v/v). The TM BSA-PAG constructed has an acoustic impedance of 1.67 MRayls, a speed of sound of 1576 m/s, an attenuation coefficient of 0.52 dB/cm at 1 MHz, a backscattering coefficient of 0.242 × 10−3 1/sr/cm at 1 MHz and a nonlinear parameter (B/A) of 5.7. These parameters are close to those of liver. The thermal and optical properties are almost the same as the standard BSA-PAG. The characteristic features of the thermal lesions by HIFU were observed to be more accurately visualized in the TM BSA-PAG than in the standard BSA-PAG. In conclusion, the proposed TM BSA-PAG acoustically mimics tissue better than the standard BSA-PAG and is expected to be preferentially used for assuring if a clinical HIFU device produces the thermal lesion as planned. 相似文献
54.
When complex data is distributed in a biased manner between disease classes, classification accuracy can be increased with a network set of perceptron neural networks developed by us. A novel projection method is also introduced for the visual classification of the data to elucidate its features and disease class distribution. The set of the perceptron neural networks and the projection method were tested with otoneurological data and they improved average sensitivity and positive predictive value at least 10% up to 85% and 83%, compared to our earlier neural network classifications with the same data. The methods were also experimented with two additional data sets, which included diagnostically very difficult cases. 相似文献
55.
Currently, portable ultrasound units lack three-dimensional (3D) image display, limiting their potential usefulness especially under remote and hostile operating environments where information must be intuitive and objective. A freehand 3D image processing and visualization software package, Ultra3D, has been developed and tested, especially to work with a miniaturized linear-array transducer probe that is connected to a laptop PC. This paper presents the software design and method to integrate Ultra3D into Terason's miniaturized SmartProbe for freehand 3D ultrasound imaging. Since images generated by Ultra3D are in a digital imaging and communications in medicine (DICOM) format, data sharing with others is easy. 相似文献
56.
国际视野下中医研究的可视化分析 总被引:1,自引:0,他引:1
以Web of Knowledge为数据来源,利用信息可视化软件CiteSpace对所采集的中医研究相关文献进行可视化分析,直观地展现中医研究的主要国家或地区、机构、期刊、高被引文献,揭示近些年来国际中医研究的热点领域并探索其发展趋势。 相似文献
57.
钱学翰 《中华医学教育杂志》2011,31(1)
本文分析了在眼科斜弱视教学中实施以问题为基础学习(problem-based learning,PBL)为导向的要点形象化教学的意义,介绍了该教学方法的具体内容,即教学内容整合重组、利用影像资源将教学要点形象化、创建特色教学形式,以及教学的具体实施过程,激发学生的学习兴趣与欲望,提高学生的学习主动性,达到理解性学习、运用所学知识解决临床实际问题的目的.Abstract: This article analyzed the necessity and advantages of practice of key point visualization teaching oriented by problem-based learning(PBL) in strabismus and amblyopia courses,introduced the specific contents of the teaching procedure,including reorganization of the contents, visualization of learning key point,creating a distinctive teaching style.All the efforts helped inspiring the students'interest and desire in learning,improving their initiative in learning,developing their ability to synthesize and achieve the purpose of comprehension-based learning and to resolve the strabismus and amblyopic problem in real clinic practices. 相似文献
58.
【目的】 从差异性视角提出期刊区分度(Journal Discriminative Capacity,JDC)测算方法,并对期刊内容的差异性进行定量测算及分析,以探测不同期刊个体之间的区分性特征及不同学科期刊总体的差异化程度。【方法】 以2015—2017年SCI、SSCI、A&HCI收录期刊的题录信息为数据源,首先通过层次聚类和JDC测算对LIS学科23种期刊内容的差异性进行深入分析;然后通过计算不同学科的JDC并结合多维尺度降维分析法来探测学科间期刊的差异性特征,同时利用学科期刊个体的JDC均值来探讨不同学科期刊的差异性。【结果】 LIS学科期刊的区分性出现明显分层,图书馆类期刊的区分性最强,评价与评述类期刊的区分性最弱;不同学科期刊具有鲜明的学科性特征,SCI收录期刊的区分性最为显著,SSCI收录期刊次之,A&HCI收录期刊的区分性最弱。【结论】 在单学科中区分度越低的期刊,其综合性特征越显著;而在多学科中,理工类期刊的内容差异性更为显著,其学科特色较人文社科类期刊更为突出。 相似文献
59.
Petra A. van den Elsen Max A. Viergever Alexander C. van Huffelen Wil van der Meij George H. Wieneke 《Brain topography》1991,3(4):425-432
Interpretation of EEG (electroencephalography) or MEG (magnetoencephalography) derived three-dimensional dipole localizations is hampered by poor visualization. This paper describes a method for combining dipole data with structural image data of the same patient. To ensure high precision this method utilizes external markers that are easy to apply. These markers can achieve subslice accuracy and can even be used to pinpoint reference points outside the scanned volume. Accurate matching is thus provided even in standard imaging protocols employing thick slices and/or large interslice gaps. The results of the matching method are presented in 2D and 3D visualizations. The hybrid images facilitate the interpretation of dipole localizations with respect to the patient's anatomy. 相似文献
60.
目的展现中国关于婴儿胆汁淤积性肝病的研究情况,描绘该领域的研究趋势,提供未来研究的可能方向。方法采用共词分析法,于2016年10月以"胆汁淤积"及"婴儿"等关键词在中国知网(CNKI)及万方数据库进行文献检索及筛选,通过Excel2010建立高频关键词共现矩阵,使用Ucinet 6.0及Netdraw绘制高频关键词可视化网络图。结果共纳入相关文献383篇。共现分析图显示,在整个国内研究领域中以"婴儿""胆汁淤积"为核心,"婴儿肝炎综合征""新生儿""肝内""胆道闭锁""遗传代谢""肝炎""巨细胞病毒""黄疸""结合胆红素"为主要研究热点,其余大部分研究集中在"肠外营养""肝胆显像""(基因)突变""肝活检"等方面,而关于疾病的外科诊断技术以及疾病的治疗的研究较少。结论中国关于婴儿胆汁淤积性肝病的研究热点集中于病因学及鉴别诊断,基因诊断是近年来的关注点,有关治疗的研究尚有待加强,新的诊断技术是未来主要的研究方向。 相似文献