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微米级PZT驱动器尺度相关的自由振动分析
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作者 陈明 郑世杰 +2 位作者 田志昌 杨志军 冯鑫 《压电与声光》 CAS 北大核心 2020年第2期235-239,共5页
根据修正偶应力理论和哈密顿原理,并结合经典的层合梁理论,推导出具有层合结构、考虑力-电耦合作用的微米级均质、非均质锆钛酸铅(PbZrTiO3,PZT)智能驱动器尺度相关的运动控制方程和固有频率。通过引入的材料内禀特征尺寸参数,成功捕获... 根据修正偶应力理论和哈密顿原理,并结合经典的层合梁理论,推导出具有层合结构、考虑力-电耦合作用的微米级均质、非均质锆钛酸铅(PbZrTiO3,PZT)智能驱动器尺度相关的运动控制方程和固有频率。通过引入的材料内禀特征尺寸参数,成功捕获了微米级PZT智能驱动器的尺寸效应。数值分析显示,不同基体材料对微米级均质、非均质PZT智能驱动器归一化固有频率影响较小;压电层厚度不变,随着基体厚度增加,微米级PZT驱动器尺寸效应逐渐变小;随着结构特征尺寸逐渐增大,尺寸效应逐渐消失。 展开更多
关键词 修正偶应力理论 特征尺寸参数 锆钛酸铅(PbZrTiO3 PZT) 尺寸效应 微米层合结构
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Applications and challenges for single-bacteria analysis by flow cytometry 被引量:3
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作者 lina wu shuo wang +2 位作者 yiyi song xu wang xiaomei yan 《Science China Chemistry》 SCIE EI CAS CSCD 2016年第1期30-39,共10页
Flow cytometry(FCM)is a powerful technique for single-bacteria analysis via simultaneous light-scattering and fluorescence measurements.By offering high-throughput,quantitative,and multiparameter analysis at the singl... Flow cytometry(FCM)is a powerful technique for single-bacteria analysis via simultaneous light-scattering and fluorescence measurements.By offering high-throughput,quantitative,and multiparameter analysis at the single-cell level,FCM has gained an increased popularity in microbiological research,food safety monitoring,water quality control,and clinical diagnosis.Here we will review the recent applications of flow cytometry in areas such as(1)total bacterial cell count,(2)bacterial viability analysis,(3)specific bacterial detection and identification,(4)characterization of physiological changes under environmental perturbations,and(5)biological function studies.Nevertheless,despite these widespread applications,challenges still remain for the detection of small sizes of bacteria and biochemical features that cannot be brightly stained via fluorescence.Recent improvement in FCM instrumentation will be discussed,and particularly the development of high sensitivity flow cytometry for advanced analysis of single bacterial cells will be highlighted. 展开更多
关键词 flow cytometry single-bacteria analysis light scattering bacterial count bacterial viability
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