A novel on-chip three-dimensional micromachined calorimeter with fully enclosed and suspended thin-film chamber for thermal characterization of liquid samples     

Benyamin Davaji  Hye Jeong Bak  Woo-Jin Chang  Chung Hoon Lee 《Biomicrofluidics》2014,8(3)

A microfabricated calorimeter (μ-calorimeter) with an enclosed reaction chamber is presented. The 3D micromachined reaction chamber is capable of analyzing liquid samples with volume of 200 nl. The thin film low-stress silicon nitride membrane is used to reduce thermal mass of the calorimeter and increase the sensitivity of system. The μ-calorimeter has been designed to perform DC and AC calorimetry, thermal wave analysis, and differential scanning calorimetry. The μ-calorimeter fabricated with an integrated heater and a temperature sensor on opposite sides of the reaction chamber allows to perform thermal diffusivity and specific heat measurements on liquid samples with same device. Measurement results for diffusivity and heat capacitance using time delay method and thermal wave analysis are presented.  相似文献   

Fast and reliable droplet transport on single-plate electrowetting on dielectrics using nonfloating switching method     

Jun Kwon Park  Seung Jun Lee    Kwan Hyoung Kang 《Biomicrofluidics》2010,4(2)

In a droplet transport based on electrowetting on dielectrics, the parallel-plate configuration is more popular than the single-plate one because the droplet transport becomes increasingly difficult without cover plate. In spite of the improved transport performance, the parallel-plate configuration often limits the access to the peripheral components, requesting the removal of the cover plate, the single-plate configuration. We investigated the fundamental features of droplet transport for the single-plate configuration. We compared the performance of several switching methods with respect to maximum speed of successive transport without failure and suggested nonfloating switching method which is inherently free from the charge-residue problem and exerts greater force on a droplet than conventional switching methods. A simple theory is provided to understand the different results for the switching methods.  相似文献   

Analysis of Open Access Landscape   总被引：4，自引：0，他引：4  

Helen Doyle Andy Gass Debra Lappin Rebecca Kennison 《图书情报工作》2005,49(12):6-13

This paper is created by bounding 5 editorials of Public Library of Science （PLoS） which have written on various aspects of open access. It covers wide range topics of important open access issues, such as from paying for open access to copyright to open access as a public issue, which may be more or less of interest of our audience.  相似文献   

专业元数据词表研究     

杉本重雄  李沅淑  室谷美佳  永森光晴  森山光良  张春景  刘炜 《图书馆杂志》2004,23(9):60-66

因特网已成为全球性的信息环境，我们可以跨越时空获取信息资源。然而，当用户使用自身社区的术语和元数据方案来检索信息时，现在的因特网技术还没有成熟到能提供专业信息设施。元数据担任很重要的角色来帮助实现社区导向的信息环境。本文进行了两项案例研究，包括建立专业主题词表(用于图书馆和图书馆信息科学资源主题网关(LIS)的核心主题词表)和用于地方社区门户网站的主题词表。从这两个案例可以看出小型的主题词表对专业服务是非常有用的，并且维护工作对词表的建立和应用是至关紧要的。为了在网络上建立专业信息环境，我们必须解决对元数据方案来说相悖的两个需求——社区中的专业化(或者本地化)和社区之间的互操作。这篇文章提供了一个概念模型来理解解决这个问题所要涉及的诸多方面。  相似文献   

The user friendly card catalog     

Lee SK  Ekstrand NL 《Medical reference services quarterly》1984,3(3):49-63

The changing roles and relationships of professional staff in Reference and Cataloging departments in the catalog creation process are discussed. Specific examples are given for handling classification, subject headings and cross references. The article stresses the importance of interface between the two departments in making the catalog more accessible to the users of the library.  相似文献   

承德的深秋     

Helen  李连成 《承德职业学院学报》2005,10(1)

蒙古的秋风, 在广意的原野上款款而行。 带走了夏日的绿荫, 森林与河岸涂上了彩色的清冷。 秋叶飘零。 幽静的小路上不见了情侣的身影。不要叹惋秋的寂静,树林中处处深藏着心的秘密,甜美而晶莹。 Mogollan Winds Aweep down the shade chasing away the shade lnom the lonest and the nlvenbanks Loves qulckly escape only theln secnets they leave behind 承德的深秋@Helen @李连成…  相似文献   

Annual report of the chemical section, 1898     

Lee K. Frankel 《Journal of The Franklin Institute》1899,147(2):162-163

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SCI citation analysis and impact factor prediction of JZUS-B in 2008     

Han-feng LIN  Xiu-fang WU  Yue-hong Helen ZHANG 《Journal of Zhejiang University. Science. B》2009,10(1)

In 2005, Journal of Zhejiang University-SCIENCE was split formally into two distinct sections making them in fact two separate journals: Journal of Zhejiang Uni-versity-SCIENCE A (JZUS-A) focused on Applied Physics and Engineering; Journal of Zhejiang Univer-sity-SCIENCE B (JZUS-B) focused on Biomedicine, Biochemistry and Biotechnology.  相似文献   

Editorial     

Helen M. Gunter  Tanya Fitzgerald 《Journal of educational administration and history》2009,41(4):307-310

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Erratum to: Effectiveness of government's occupational skills development strategies for small- and medium-scale enterprises: A case study of Korea” by Kye Woo Lee, 2005. International Journal of Education Development 26(3), 278–294     

K.W. Lee 《International Journal of Educational Development》2008

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