Marangoni effect of cracked liquid film of an aqueous electrolyte flowing over a vertical heated plate

An experimental investigation was performed on Marangoni effect of cracked liquid film of aqueous Na_2SO_4 flowing over a vertical heated plate by using a sensitive infrared imaging technique. The results show that the thermal and solutal Marangoni effects, which result from the non-uniform distributions of surface temperature and concentration of the film, respectively, occur in the streamwise and transverse directions of the film, generating different influences on the film heat transfer. Taking account of the Marangoni number (Ma) and the solution concentration (c_0), a correlation of the Nusselt number (Nu) for the cracked liquid film is proposed.     

红外成像中的微扫描技术研究

微扫描技术是在现有红外探测器基础上提升空间分辨率的一种有效方法。详细地分析了微扫描过程和减小图像频谱混淆的原理。在此基础上研究了实际应用中选取合适微扫描级数的方法。     

井旁地质界面的反射波模拟及f-k偏移成像研究

本文针对现有阵列声波测井仪器,对井旁不同角度和不同位置井旁地质界面的全波波列进行了物理和数值模拟。结果表明,在现有仪器源距范围内,可以从全波波形中观测到清晰的反射纵波。在此基础之上,针对阵列声波全波数据特点,对Stolt的f-k偏移方法进行了改进,使其更适应于阵列声波测井需要,该方法不受地质界面倾角的限制,而且一次可以有效地处理大量现场数据,可以分别得到上倾和下倾井旁地质界面图像。最后,应用该方法对一个倾斜井的阵列声波数据进行了处理,有效的得到了井旁地层界面成像图,验证了该方法的可靠性。     

对医疗领域中的认知不公正论证的反思

卡瑞尔和基德认为弗里克提出的"认知不公正"概念在医疗领域中也存在,她们论证了这一领域的证言不正义和阐释不正义.然而本文认为,医疗领域与认知不公正问题的典型领域存在显著差异,其差异主要在于专业知识的不对称,病人证言依赖于知识语境和医生能力.因而用认知不公正的概念来表述这些问题会一定程度掩盖其中更为深层的两类知识之间的交互...     

面向医疗物联网的一种行为规则入侵检测方法

物理世界的复杂性和多样性,给医疗物联网系统的安全检测带来了困难。为了解决该问题,研究了恶意攻击行为对检测行为的影响,提出了一种行为规则的入侵检测方法,可应用于医疗物联网系统。实验验证:与其它方法相比,检测率更高、生存周期更长、能量消耗更低,能够应对复杂攻击和隐蔽攻击,保障医疗物联网系统的安全性。     

一体化医学语言系统及其对我国的借鉴作用

由美国国立卫生院开发创立的一体化医学语言系统已成为世界上最全面的医学术语系统,它包括四个组成部分：元叙词表、语义网络、专家词典与相关词典项目、支持性软件工具,并拥有17个语言版本。一体化医学语言系统不仅为全球使用者搜索文献提供便捷,也为我国电子病历的实施提供术语学基础。     

长株潭地区医学类院校学生体育运动情况的现状及对策研究

通过调查长株潭地区医学类院校学生的体育态度、参与体育运动的价值取向、体育运动项目的选择和学生的体育运动频率四个方面的情况,可以指导学生科学地进行体育锻炼,促进医学类院校体育工作的开展。     

CT和MRI在梅尼埃病诊断中的应用

目的探讨CT与MRI对梅尼埃病的诊断价值。方法通过复习文献,分析CT和MRI在内耳成像特点及其在梅尼埃病中的应用价值。结果CT对内耳的骨性结构、乳突的气化情况及面神经管形态方面,CT优于MRI;而MRI对软组织结构显示清楚,二者各有所长。将CT和MRI影像结合起来对内耳结构骨与软组织关系显示清晰可应用于梅尼埃病临床诊断。结论CT和MRI对梅尼埃病的诊断优势互补。     

Development of microwave-induced thermo-acoustic tomography prototype system

Due to its advantages in both contrast and resolution compared with conventional microwave or ultrasound imaging system, microwave-induced thermo-acoustic tomography （MITAT） has received more and more concerns in biologic tissue image field. In this paper, an integrated prototype of MITAT system is presented. Using this system, some basic experiments for biologic tissue objects with high water-content imbedded in fatty material have been done. In the MITAT experiments, the signals generated by two porcine muscle tissue strips with millimeter order scale in cross-section were collected. Images with both good contrast and resolution were obtained. In order to demonstrate the advantages of MITAT, some ultrasonic experiments were studied using a commercial ultrasonic linear array system. The comparisons of the results of both systems show the good performance of the MITAT prototype system for the detection of high water content targets, which is generally the same as the tumor in biologic tissue.     

A new method for imaging faint objects nearby a bright source

In astronomical observation, it is difficult to obtain the image of faint objects in the peripheral area around a bright celestial body. In order to solve the problem, a new method is designed and experimented, which is called the separation readout technique (SRT). SRT is different from either the traditional coronagraphy or the newly-developed anti-blooming CCD technique, and allows an enough-long exposure to the faint objects in the area around a bright celestial body with the well-preserved bright body’s image in one frame. This paper describes in detail the principle of SRT, the computer simulation, the experimental devising and result of SRT observation on a telescope.