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Low frequency wide bandwidth MEMS energy harvester based on spiral-shaped PVDF cantilever

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Science China(Technological Sciences) 2014年第6期57卷 1068-1072页

作者： LIU Wen HAN MengDi MENG Bo sun xuming HUANG XianLiang ZHANG HaiXia Institute of Microelectronics Peking University Peking University Shenzhen Graduate School Samsung Advanced Institute of Technology

In this paper,a piezoelectric energy harvester based on spiral-shaped polyvinylidene fluoride(PVDF)cantilever is designed and fabricated for harvesting low frequency vibration energy in the *** this design,the spiral-shaped PVDF cantilever is major for lowering the resonant frequency by increasing the length of the cantilever;Copper and silicon proof masses on both sides are working on further decreasing the resonant frequency and widen its *** to the high flexibility of the PVDF cantilever,this device is extremely sensitive to vibration and can harvest weak vibration *** simulation and experimental results have approved that this device can operate at very low frequency which is about 20 Hz and can effectively harvest energy from 15–50 *** peak of the output voltage can reach 1.8 V with the acceleration of 0.2 *** is a promising harvester for powering the wireless sensors in the future.

关键词： piezoelectric energy harvester PVDF low frequency wide bandwidth

Micro Fabry Perot light modulator for flat panel display

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Frontiers of Optoelectronics 2008年第Z2期1卷 210-214页

作者： Jiyong sun Shanglian HUANG Jie ZHANG Yi QIN xuming sun The Key Laboratory for Optoelectronic Technology and System Education Ministry of China Optoelectronic Engineering DepartmentChongqing University

A new type of Fabry Perot light modulator for displays based on micro-electro-mechanical system technology is proposed. Multiple beam interference theory is used to design the modulator and analyze its characteristics. If Fabry Perot cavity length is one-quarter of the incident wavelength, the transmitted light is blocked by the modulator, and the modulator, which is illuminated from its backside, appears black. If the Fabry Perot cavity length is 0 or one-half of the incident wavelength, light may transmit the Fabry Perot modulator from its backside, and the modulator appears bright. Hence, the modulator may be used for flat panel displays. In this paper one Fabry Perot light modulator based on surface micromachining technology is introduced. The designed modulator has a contrast ratio of 150 and can theoretically be driven by a voltage of 2.4 V.

关键词： optical micro-electro-mechanical system (optical MEMS) Fabry Perot light modulator interference display

Extraction, detection, and profiling of serum biomarkers using designed Fe3O4@SiO2@HA core-shell particles

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Nano Research 2018年第1期11卷 68-79页

作者： Chandrababu Rejeeth Xuechao Pang Ru Zhang Wei Xu xuming sun Bin Liu Jiatao Lou Jingjing Wan Hongchen Gu Wei Yan Kun Qian School of Biomedical Engineering Shanghai Center for System Biomedicine Shanghai Chest Hospital and Med-X Research Institute Shanghai Jiao Tong University Shanghai 200030 China Department of Chemistry Shanghai University Shanghai200444 China

Serum biomarkers in the form of proteins （e.g. cluster of differentiation-44 （CD44）） have been demonstrated to have high clinical sensitivity and specificity for disease diagnosis and prognosis. Owing to the high sample complexity and low molecular abundance in serum, the detection and profiling of biomarkers rely on efficient extraction by materials and devices, mostly using immunoassays via antibody-antigen recognition. Antibody-free approaches are promising and need to be developed for real-case applications in serum to address the limitations of antibody-based techniques in terms of robustness, expense, and throughput. In this work, we demonstrated a novel approach using hyaluronic acid （HA）-modified materials/devices for the extraction, detection, and profiling of serum biomarkers via ligand-protein interactions. We constructed Fe304@SiOa@HA particles with different sizes through layer-by-layer assembly and for the first time applied HA-functionalized particles in the facile extraction and sequence identification of CD44 in serum by mass spectrometry. We also first validated HA-CD44 binding through electrochemical sensing using HA- modified electrodes in both standard solutions and diluted serum samples, achieving a detection limit of -0.6 ng/mL and a linear response range from I ng/mL to 10 ~tg/mL. Furthermore, we performed profiling of HA-binding serum proteome, providing a new preliminary benchmark for the construction of future databases, and we investigated selected surface chemistries of particles for the capture of proteins in serum. Our work not only resulted in the development of a platform technology for CD44 extraction/detection and HA-binding proteome identification, but also guided the design of ligand affinity-based approaches for antibody-free analysis of serum biomarkers towards diagnostic applications.

关键词： ligand-protein interaction magnetic particles serum biomarkers cluster of differentiation44(CD44) sensors mass spectrometry

A Plasmonic Mass Spectrometry Approach for Detection of Small Nutrients and Toxins

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Nano-Micro Letters 2018年第3期10卷 155-163页

作者： Shu Wu Linxi Qian Lin Huang xuming sun Haiyang Su Deepanjali D.Gurav Mawei Jiang Wei Cai Kun Qian School of Biomedical Engineering Med-X Research Institute Shanghai Jiao Tong University Xinhua Hospital Shanghai Institute for Pediatric ResearchShanghai Jiao Tong University

Nutriology relies on advanced analytical tools to study the molecular compositions of food and provide key information on sample quality/safety. Small nutrients detection is challenging due to the high diversity and broad dynamic range of molecules in food samples, and a further issue is to track low abundance toxins. Herein, we developed a novel plasmonic matrix-assisted laser desorption/ionization mass spectrometry(MALDI MS)approach to detect small nutrients and toxins in complex biological emulsion samples. Silver nanoshells(SiO_2@-Ag) with optimized structures were used as matrices andachieved direct analysis of ~ 6 n L of human breast milk without any enrichment or separation. We performed identification and quantitation of small nutrients and toxins with limit-of-detection down to 0.4 pmol(for melamine) and reaction time shortened to minutes, which is superior to the conventional biochemical method currently in use. The developed approach contributes to the near-future application of MALDI MS in a broad field and personalized design of plasmonic materials for real-case bio-analysis.

关键词： Plasmonic materials Laser desorption/ionization Mass spectrometry Small nutrients Toxins

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增强增韧聚乳酸纤维的制备及其性能

纺织学报 2017年第4期38卷 12-16页

作者：李旭明孙西超师利芬绍兴文理学院纺织服装学院浙江绍兴312000 绍兴市出入境检验检疫局浙江绍兴312000

为增强增韧聚乳酸纤维,采用聚酰胺(PA)与聚乳酸(PLA)制备了PLA/PA共混纤维,并对其热学性能、结晶、热稳定性、PA的分散性以及PLA/PA共混纤维的力学性能进行了研究。研究结果表明:PA的加入对PLA的玻璃化转变温度及熔融温度没有显著影响,... 详细信息

为增强增韧聚乳酸纤维,采用聚酰胺(PA)与聚乳酸(PLA)制备了PLA/PA共混纤维,并对其热学性能、结晶、热稳定性、PA的分散性以及PLA/PA共混纤维的力学性能进行了研究。研究结果表明:PA的加入对PLA的玻璃化转变温度及熔融温度没有显著影响,但改善了PLA的结晶行为,结晶度提高了551.6%;PLA热稳定性随着PA含量的增加而提高;PA在PLA中分散均匀;随着牵伸倍数的增加,PLA/PA共混纤维的取向度提高,力学性能得到改善,当牵伸倍数从1.5增加到3.0时,取向度提高了30.88%,同时纤维的断裂强度提高了48.58%;当PA质量分数为1%和20%时,PA/PLA共混纤维的断裂强度分别提高了8.6%和25%,断裂伸长率分别提高了10.9%和55.9%。

关键词：增强增韧聚乳酸聚酰胺共混纤维

不同抗旱性小麦品种内生细菌群落结构及功能预测

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麦类作物学报 2024年第3期44卷 399-406页

作者：张昊张荣涛吴魏位孙旭明岳红西北农林科技大学农学院陕西杨凌712100

为探究不同抗旱性小麦品种内生细菌的群落结构及多样性,采用高通量测序技术对抗旱小麦品种运旱618和干旱敏感品种中国春在杨凌和宿迁两个地区的根内生细菌进行测序及生物信息学分析,分析基因型和环境对内生菌群落结构与功能的影响。从Si... 详细信息

为探究不同抗旱性小麦品种内生细菌的群落结构及多样性,采用高通量测序技术对抗旱小麦品种运旱618和干旱敏感品种中国春在杨凌和宿迁两个地区的根内生细菌进行测序及生物信息学分析,分析基因型和环境对内生菌群落结构与功能的影响。从Simpson和Shannon指数看,运旱618根内生菌在杨凌和宿迁均具有较高的群落多样性,能够特异招募微单孢子菌属(Micromonosporaceae)。两个小麦品种间的优势菌有所差异,运旱618的内生优势菌为黄杆菌属(Flavobacterium)、假单胞菌属(Pseudomonas)、泛菌属(Pantoea)和芽孢杆菌属(Bacillus);中国春的优势菌为马赛菌属(Massilia)、原小单胞菌属(Promicromonospora)、草酸杆菌属(Oxalobacteraceae)和类诺卡氏菌属(Nocardioides)等。功能预测表明,运旱618内生细菌的功能主要为调控碳代谢、脂肪酸代谢、氨基酸代谢通路,中国春内生细菌的功能主要为调控细菌趋药性、生物膜形成、叶酸生物合成通路。

关键词：小麦抗旱性内生细菌群落结构功能预测

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边界层的小波数值探测

武汉大学学报（自然科学版） 1998年第1期44卷 24-28页

作者：羿旭明叶碧泉孙建华沈远彤武汉大学数学系中国地质大学

为了对边界层问题进行奇异性数值探测，基于基数Ｂ－样条的全正特性和基数Ｂ－小波ψｍ（ｘ）的完全震荡特性，提出了小波配点计算格式，并对具有边界层的常微分方程进行了数值计算，验证了方法的有效性．

关键词：边界层小波分析配点法

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浅谈辊道窑炉结构的改进及节能

中国陶瓷工业 2007年第6期14卷 46-47页

作者：丁志坚余春生孙绪明黄冈市华窑中瓷窑炉有限公司 438000

针对目前辊道窑存在的窑顶结构、砌筑材料、余热利用、燃空比等几方面所存在的问题,提出了相应的改进意见。

关键词：辊道窑改进节能

碳纤维双微电极对H_(2)O_(2)和NO的同步检测

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分析科学学报 2022年第1期38卷 31-36页

作者：韦相宇王昌李振新杨巧玉孙旭明任琼琼新乡医学院医学工程学院河南新乡453003

H_(2)O_(2)与NO是在多种生理条件下产生的强氧化剂和硝化剂,二者的平衡与过量产生与多种神经退行性疾病的发生有关。因此,同时监测生物系统中H_(2)O_(2)与NO的浓度对了解二者在生理条件下的作用机制具有重要意义。基于电化学方法快速、... 详细信息

H_(2)O_(2)与NO是在多种生理条件下产生的强氧化剂和硝化剂,二者的平衡与过量产生与多种神经退行性疾病的发生有关。因此,同时监测生物系统中H_(2)O_(2)与NO的浓度对了解二者在生理条件下的作用机制具有重要意义。基于电化学方法快速、准确、灵敏度高等优点,本研究提出了一种可在体同步检测H_(2)O_(2)和NO的双微电极。将铂纳米颗粒(PtNPs)和邻苯二胺(OPD)用于修饰碳纤维(CF)电极,以提高电极的灵敏度和选择性。同时将参比电极与工作电极集成在一起,减小电极体积,减轻电极对组织细胞的损伤。测得H_(2)O_(2)电极的线性检测范围为2.0~96.9μmol/L(R^(2)=0.9904),检测限为1.7μmol/L;NO电极的线性检测范围为2.1~279.3μmol/L(R^(2)=0.9983),检测限为0.5μmol/L。该电极对抗坏血酸、多巴胺等体内常见干扰物没有响应,具有较强的抗干扰能力。

关键词：碳纤维 H_(2)O_(2) NO 同步检测