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MEMS红外光源定向辐射结构设计与分析 被引量:3
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作者 孔龄婕 贺婷 +3 位作者 陈东红 燕乐 张鹏 丑修建 《红外技术》 CSCD 北大核心 2015年第6期492-495,共4页
红外光源辐射利用率是制造高性能红外系统的关键,准直透镜因其减少红外光源的广角散射而大幅提高红外光源利用率。针对MEMS红外光源设计CaF2高红外透射材料的双凸曲面结构准直辐射透镜,使红外光线收敛呈准直辐射;由MEMS红外光源封装确... 红外光源辐射利用率是制造高性能红外系统的关键,准直透镜因其减少红外光源的广角散射而大幅提高红外光源利用率。针对MEMS红外光源设计CaF2高红外透射材料的双凸曲面结构准直辐射透镜,使红外光线收敛呈准直辐射;由MEMS红外光源封装确定透镜最佳口径r=6.48 mm,透镜焦距f=7.2 mm,透镜厚度d'≤2 mm,用Zemax光学软件仿真优化,得出中间层厚度d=0.309 mm。并进行透镜的聚光光路仿真分析和效果验证,为定向辐射MEMS红外光源研发提供最优的原型尺寸参数,极大提高设计效率。 展开更多
关键词 MEMS红外光源 准直透镜 聚光封装 收敛辐射
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A microfluidic photolithography for controlled encapsulation of single cells inside hydrogel microstructures 被引量:4
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作者 JiangJiang Liu Dan Gao +1 位作者 SiFeng Mao Jin-Ming Lin 《Science China Chemistry》 SCIE EI CAS 2012年第4期494-501,共8页
A microfluidic approach to generate hydrogel microstructures inside microchannels for controlled encapsulation of single cells was developed. The method was based,on a modified microscope projection photolithography w... A microfluidic approach to generate hydrogel microstructures inside microchannels for controlled encapsulation of single cells was developed. The method was based,on a modified microscope projection photolithography which allowed for the photopolymerization of poly(ethylene glycol) diacrylate (PEGDA) inside microchannels. Uniformsized hydrogel microstmctures (-50 pan in diameter) were generated one by one with determined positions to encapsulate single cells without losing the viability. Cells of interest could be identified by any kinds of visible labels to be selectively encapsulated inside the formed hydrogel microstructures. Large-scale encapsulation of single cells was achieved with a relatively high efficiency of 80% and the viability of encapsulated cells could be guaranteed by removing the dead cells identified with Trypan blue. This method is simple, fast and convenient to pattern the microchannels with single cells for a wide range of cell-based applications. For demonstration, two intracellular enzyme assays of carboxylesterase were performed to investigate the distribution of enzyme concentrations and the kinetic information within the encapsulated single HepG2 cells. 展开更多
关键词 microfluidic single cells hydrogel microstructures HepG2 cells enzyme assay
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