管壳式换热器强化传热技术研究综述     

杨程  李奇军  时立民  罗海玉 《天水师范学院学报》2015,(2):60-65

在分析管壳式换热器传热强化途径的基础上,主要从管程和壳程两方面介绍了传热强化结构及其强化传热机理,综述了近年来国内外高效节能管壳式换热器的研究进展,列举了一些应用于管壳式换热器中管程和壳程强化传热的典型换热管和壳程支撑结构,为未来换热器的研究指明了方向。  相似文献   

独立学院学生国际交流现状与对策研究——以苏州大学文正学院为例     

梅莹  施盛威 《湖北函授大学学报》2015,(2):5-6

积极开展学生国际交流活动是独立学院教育国际化战略的重要组成部分。本文根据近一年来苏州大学文正学院学生参与国际交流项目情况以及学生出国留学意向调查结果,对独立学院学生国际交流现状与困境进行分析,并提出相应对策和建议。  相似文献   

Quantitative detection of cells expressing BlaC using droplet-based microfluidics for use in the diagnosis of tuberculosis     

Fengjiao Lyu  Manqi Xu  Yunfeng Cheng  Jinghang Xie  Jianghong Rao  Sindy K. Y. Tang 《Biomicrofluidics》2015,9(4)

This paper describes a method for the quantitative detection of cells expressing BlaC, a β-lactamase naturally expressed by Mycobacterium tuberculosis, intended for the diagnosis of tuberculosis. The method is based on the compartmentalization of bacteria in picoliter droplets at limiting dilutions such that each drop contains one or no cells. The co-encapsulation of a fluorogenic substrate probe for BlaC allows the quantification of bacteria by enumerating the number of fluorescent drops. Quantification of 10 colony forming units per milliliter is demonstrated. Furthermore, the encapsulation of single cell in drops maintains the specificity of the detection scheme even when the concentration of bacteria that do not express BlaC exceeds that expressing BlaC by one million-fold.  相似文献   

Homogeneous agglutination assay based on micro-chip sheathless flow cytometry     

Zengshuai Ma  Pan Zhang  Yinuo Cheng  Shuai Xie  Shuai Zhang  Xiongying Ye 《Biomicrofluidics》2015,9(6)

Homogeneous assays possess important advantages that no washing or physical separation is required, contributing to robust protocols and easy implementation which ensures potential point-of-care applications. Optimizing the detection strategy to reduce the number of reagents used and simplify the detection device is desirable. A method of homogeneous bead-agglutination assay based on micro-chip sheathless flow cytometry has been developed. The detection processes include mixing the capture-probe conjugated beads with an analyte containing sample, followed by flowing the reaction mixtures through the micro-chip sheathless flow cytometric device. The analyte concentrations were detected by counting the proportion of monomers in the reaction mixtures. Streptavidin-coated magnetic beads and biotinylated bovine serum albumin (bBSA) were used as a model system to verify the method, and detection limits of 0.15 pM and 1.5 pM for bBSA were achieved, using commercial Calibur and the developed micro-chip sheathless flow cytometric device, respectively. The setup of the micro-chip sheathless flow cytometric device is significantly simple; meanwhile, the system maintains relatively high sensitivity, which mainly benefits from the application of forward scattering to distinguish aggregates from monomers. The micro-chip sheathless flow cytometric device for bead agglutination detection provides us with a promising method for versatile immunoassays on microfluidic platforms.  相似文献   

Microscale flow propulsion through bioinspired and magnetically actuated artificial cilia     

Chia-Yuan Chen  Ling-Ying Cheng  Chun-Chieh Hsu  Karthick Mani 《Biomicrofluidics》2015,9(3)

Recent advances in microscale flow propulsion through bioinspired artificial cilia provide a promising alternative for lab-on-a-chip applications. However, the ability of actuating artificial cilia to achieve a time-dependent local flow control with high accuracy together with the elegance of full integration into the biocompatible microfluidic platforms remains remote. Driven by this motive, the current work has constructed a series of artificial cilia inside a microchannel to facilitate the time-dependent flow propulsion through artificial cilia actuation with high-speed (>40 Hz) circular beating behavior. The generated flow was quantified using micro-particle image velocimetry and particle tracking with instantaneous net flow velocity of up to 10¹μm/s. Induced flow patterns caused by the tilted conical motion of artificial cilia constitutes efficient fluid propulsion at microscale. This flow phenomenon was further measured and illustrated by examining the induced flow behavior across the depth of the microchannel to provide a global view of the underlying flow propulsion mechanism. The presented analytic paradigms and substantial flow evidence present novel insights into the area of flow manipulation at microscale.  相似文献   

Perform kicking with or without jumping: joint coordination and kinetic differences between Taekwondo back kicks and jumping back kicks     

Kuangyou B. Cheng  Ying-Hsun Wang  Shih-Yu Kuo  Kuan-Mao Wang  Yi-Chang Huang 《Journal of sports sciences》2015,33(15):1614-1621

We investigated joint coordination differences between Taekwondo back kicks and jumping back kicks, and how jumping (in performing the latter) would alter engaging ground reaction forces (GRF) in executing kicking. Ten skilful athletes volunteered to perform both kinds of kicking within the shortest time for three successful trials. Three high-speed cameras and two force platforms were used for data collection, and the trial with the shortest execution time was selected for analysis. Movements were divided into the rotation and attack phases. With comparable execution time and maximum joint linear/angular speeds, back kicks and jumping back kicks differ mainly in larger GRF in the latter, and in greater target acceleration in the former probably because the support leg prevented athletes’ rebounding after impact. In addition, more prominent antiphase and in-phase coordination between the shoulder segment and knee joint, and elongated rotation phase were found in jumping back kicks. Larger GRF values in jumping back kicks were generated for jump take-off rather than for a more powerful attack. In back kicks although the support leg remained ground contact, greatly decreased GRF in the attack phase suggested that the support leg mainly served as a rotation axis.  相似文献   

体育城市本土创建的社会病理分析     

王成  张鸿雁 《武汉体育学院学报》2015,(3):24-28

现代体育作为一项社会文化活动,是特色和软实力的鲜明体现,在城市文化创建中发挥独特的价值功效。国内城市热衷通过体育提高城市竞争力,为谋求城市转型发展注入生机活力,宣告城市崛起。但是在"办大赛促发展"、"体育搭台、经济唱戏"的外表之下,体育城市创建往往存在本土特色缺失与体育城市类型定位模糊、城市契约精神和法权意识淡薄、误读与曲解奥林匹克理念和体育精神、市民社会发育不成熟、体育氛围无意识、城市文化生态破坏、城市公共体育空间缺失、城市人的主体感受被忽视等深层次问题,这些城市社会病理并未得到真正解决,体育与城市难以内在融合。  相似文献   

日本职业足球联赛市场营销研究     

郑骋 《湖北体育科技》2015,(2):149-152

日本足球在国内的推广与国际营销经验、国内政策和国家的理想抱负是紧密交织在一起的。正是因为它的多重角色和利益,日本足球并不是被动地服从全球化进程,相反就游戏规则、踢球风格、组织模式和市场机会而言,它形成了自己的特点,大部分与欧洲的经历形成鲜明对比。  相似文献   

优秀赛艇运动员测功仪2000m模拟比赛供能特征研究     

毛承 《浙江体育科学》2015,37(1)

研究的目的在于运用测功仪模拟赛艇2 000m比赛,以探究赛艇项目比赛过程中的供能特征.10名某省优秀赛艇运动员(男6女4)自愿参加赛艇测功仪6.5min的全力划.运用便携式气体代谢仪(CosMed,K4b2)所测得的摄氧量数据和血乳酸分析仪(Diagnostic C-line,EKF)所测得的血乳酸数据进行能量供应量的计算.结果表明,赛艇项目2 000m三大供能系统的比例分别为6.2％(无氧无乳酸)、10.1％(无氧乳酸)、83.7％(有氧).研究结果与前人研究相似,并进一步明确了有氧供能对于赛艇比赛的重要性.三大供能系统比例的确定为教练员安排训练负荷和评价运动员的运动能力提供了理论依据.  相似文献   

长拳与太极拳对大学生体质影响对比研究     

阮孝欣  程馨  张静丽 《搏击·武术科学》2015,(7)

近年来,中国大学生体质的逐渐下降,已经成了大家普遍关注的问题,提高大学生身体素质已迫在眉睫。文章运用实验法、对比分析法对长拳和太极拳对大学生体质的影响进行比对,将受试学生分成四组,进行不同内容的教学,实验结果得出：长拳和太极拳对大学生的体质都有干预作用。太极拳在对大学生呼吸系统的影响比长拳更显著;对大学生身体素质影响方面长拳的干预作用要优于太极拳。  相似文献