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Flexible pressure sensors with ultrahigh stress tolerance enabled by periodic microslits

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Microsystems & Nanoengineering 2024年第1期10卷 301-311页

作者： Song wang chenying wang Yifan Zhao Yujing Zhang Yaxin Zhang Xiangyue Xu Qijing Lin Kai Yao Yuheng wang Feng Han Yu Sun Zhuangde Jiang State Key Laboratory for Manufacturing Systems Engineering International Joint Laboratory for Micro/Nano Manufacturing and Measurement TechnologiesSchool of Mechanical EngineeringXi’an Jiaotong UniversityXi’anChina State Key Laboratory for Manufacturing Systems Engineering International Joint Laboratory for Micro/Nano Manufacturing and Measurement TechnologiesSchool of Instrument Science and TechnologyXi’an Jiaotong UniversityXi’anChina The Faculty of Electrical Engineering and Computer Science Ningbo UniversityNingboChina Department of Mechanical and Industrial Engineering University of TorontoTorontoCanada

Stress tolerance plays a vital role in ensuring the effectiveness of piezoresistive sensing films used in flexible pressure sensors.However,existing methods for enhancing stress tolerance employ dome-shaped,wrinkle-shaped,and pyramidal-shaped microstructures in intricate molding and demolding processes,which introduce significant fabrication challenges and limit the sensing performance.To address these shortcomings,this paper presents periodic microslits in a sensing film made of multiwalled carbon nanotubes and polydimethylsiloxane to realize ultrahigh stress tolerance with a theoretical maximum of 2.477 MPa and a sensitivity of 18.092 kPa−1.The periodic microslits permit extensive deformation under high pressure(e.g.,400 kPa)to widen the detection range.Moreover,the periodic microslits also enhance the sensitivity based on simultaneously exhibiting multiple synapses within the sensing interface and between the periodic sensing cells.The proposed solution is verified by experiments using sensors based on the microslit strategy for wind direction detection,robot movement sensing,and human health monitoring.In these experiments,vehicle load detection is achieved for ultrahigh pressure sensing under an ultrahigh pressure of over 400 kPa and a ratio of the contact area to the total area of 32.74%.The results indicate that the proposed microslit strategy can achieve ultrahigh stress tolerance while simplifying the fabrication complexity of preparing microstructure sensing films.

关键词： robot shaped stress

Constrained multiobjective robust optimization of a bistable mechanism for inertial switch

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Science China(Technological Sciences) 2023年第11期66卷 3186-3196页

作者： LIU Min wang WeiDong ZHU YingMin YUAN YangBo NIU YanXu DONG LinXi wang chenying JIANG Kyle CHEN GuiMin School of Mechano-Electronic Engineering Xidian UniversityXi’an 710071China School of Electronic Information Hangzhou Dianzi UniversityHangzhou 310018China Collaborative Innovation Center of High-End Manufacturing Equipment Xi’an Jiaotong UniversityXi’an 710049China School of Mechanical Engineering University of BirminghamBirmingham B152TTUK School of Mechanical Engineering Xi’an Jiaotong UniversityXi’an 710049China

This paper proposes an optimization method for finding the optimal design of a bistable mechanism with a desired performance that is robust to structural and material uncertainties.Using interval numbers to characterize the uncertainties in the structural parameters and materials,we present a nonprobabilistic multiobjective optimization model and transform it into a single objective optimization model using a penalty function.The sensitivity of the mechanical performance of bistable structures to uncertain parameters was analyzed,and the design parameters with notable effects on the bistable performance were identified as optimization variables.A neural network-based proxy model for the nonlinear characteristics of the bistable mechanism was established,and its accuracy was validated through finite element outcomes.Based on this model,a two-layer nested genetic algorithm was employed to solve the multiobjective robust optimization problem of the bistable structures with critical forces and a second stable position.The effectiveness of the optimization method was verified by comparing it with the finite element and experimental results.The proposed method was applied in the design of silicon-based inertial switches.

关键词： multiobjective robust optimization uncertainty interval analysis bistable mechanism

Fingerprint Study of Polygonati Rhizoma with Steaming and Exposing to the Sun Alternatively for Different Times

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Medicinal Plant 2024年第2期15卷 18-20页

作者： Min wang chenying YE Qian wang Ting HE Shenggao YIN Gailian ZHOU Guangxi University of Chinese Medicine Nanning 530200China

[Objectives]To explore the influence of different times of steaming and exposing to the sun on the fingerprint of Polygonati Rhizoma by studying the HPLC fingerprint of Polygonati Rhizoma processed products with different times of steaming and exposing to the sun,and to provide a basis for the determination of the best processing technology of Polygonati Rhizoma.[Methods]SETSAIL II AQ-C 18(5μm×250 mm×4.6 mm)was used as the column,the column temperature was 30℃,pure water(A)and acetonitrile(B)were eluted gradually,0-10 min,B(5%-10%),10-30 min,B(10%-35%),30-40 min,B(35%-60%),40-45 min,B(60%-100%),flow rate 1 mL/min,absorption wavelength 200 nm.[Results]The relative retained peak area RSDs of the common peaks in the precision,reproducibility and stability tests were all less than 5%.There were 17 common peaks in the fingerprint of nine batches of samples,and the retention time of Peak 2 was basically the same as that of the reference peak of 5-HMF.Peak 4 mainly existed in the chromatogram of Sample 3 to Sample 5,peaks 5 and 11 mainly existed after Sample 3,peaks 9,14 and 16 mainly existed after Sample 6,and peaks 12 and 17 mainly existed after Sample 4.[Conclusions]A total of 17 common peaks were obtained,and the Peak 2 was the designated peak,and the chemical components of each processed product were different.

关键词： Polygonati Rhizoma Processing HPLC Fingerprint

Abel’s lemma on summation by parts and partial q-series transformations

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Science China Mathematics 2009年第4期52卷 720-748页

作者： CHU WenChang wang chenying Department of Applied Mathematics Dalian University of TechnologyDalian 116024China

The partial sums of basic hypergeometric series are investigated by means of the modified Abel lemma on summation by parts. Several transformation and summation formulae for well-poised, quadratic, cubic and quartic q... 详细信息

关键词： Abel’s lemma on summation by parts basic hypergeometric series well-poised series quadratic series cubic series quartic series reciprocal relation

An ocean acidification-simulated system and its application in coral physiological studies

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Acta Oceanologica Sinica 2018年第12期37卷 55-62页

作者： ZHENG Xinqing wang chenying HADI Tri Aryono YE Youyin PAN Ke Third Institute of Oceanography Ministry of Natural Resources Research Center for Oceanography Indonesian Institute of Sciences Institute for Advanced Study Shenzhen University

Due to the elevated atmospheric carbon dioxide, ocean acidification(OA) has recently emerged as a research theme in marine biology due to an expected deleterious effect of altered seawater chemistry on calcification. A system simulating future OA scenario is crucial for OA-related studies. Here, we designed an OA-simulated system(OASys) with three solenoid-controlled CO_2 gas channels. The OASys can adjust the pH of the seawater by bubbling CO_2 gas into seawaters via feedback systems. The OASys is very simple in structure with an integrated design and is new-user friendly with the instruction. Moreover, the OASys can monitor and record real-time pH values and can maintain pH levels within 0.02 pH unit. In a 15-d experiment, the OASys was applied to simulate OA in which the expected target pH values were 8.00, 7.80 and 7.60 to study the calcifying response of Galaxea fascicularis. The results showed daily mean seawater pH values held at pH 8.00±0.01, 7.80±0.01 and 7.61±0.01 over15 d. Correspondingly, the coral calcification of G. fascicularis gradually decreased with reduced pH.

关键词： ocean acidification OASys coral Galaxea fascicularis

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平菇在医药、化工、环境保护领域的研究进展

食品与发酵工业 2024年第1期50卷 351-358页

作者：李坤鹏郭杨子王俊明王晨莹任喜东齐鲁工业大学(山东省科学院)生物基材料与绿色造纸国家重点实验室山东济南250353 齐鲁工业大学(山东省科学院)山东省微生物工程重点实验室山东济南250353 齐鲁工业大学(山东省科学院)食品科学与工程学院山东济南250353

平菇是一种具有多种突出优点的大型真菌,受到研究人员的广泛关注,并在医药、食品、化工、环境保护等领域得到了广泛的应用。主要原因是平菇中含有丰富的多糖、蛋白质、脂质、维生素、矿物质等营养成分,并且平菇中的某些营养成分还具有... 详细信息

平菇是一种具有多种突出优点的大型真菌,受到研究人员的广泛关注,并在医药、食品、化工、环境保护等领域得到了广泛的应用。主要原因是平菇中含有丰富的多糖、蛋白质、脂质、维生素、矿物质等营养成分,并且平菇中的某些营养成分还具有抗氧化、抗菌、抗炎、降血糖、免疫调节等活性,以及具有降解纤维素、吸附其生长环境中的有害污染物、富集重金属离子等特性。目前,平菇的研究热点主要集中在医药领域,如抗氧化药物、抗菌药物、抗炎药物、降血糖药物、免疫调节剂等药物的研制;化工领域,如化妆品、柔性材料、农药等的开发;环境保护领域,如木质纤维素的利用、土壤和水系的修复。该文就平菇营养成分及其在医药、化工、环境保护领域应用的最新研究进展作综述,为平菇在各领域的开发利用提供参考。未来应在开发利用平菇营养成分活性的同时,基于平菇自身及其生长特性探索在其他领域的应用。

关键词：平菇营养成分抗氧化药物免疫调节剂柔性材料生物发酵

Fabrication of Nanoscale Step Height Structure Using Atomic Layer Deposition Combined with Wet Etching

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Chinese Journal of Mechanical Engineering 2016年第1期29卷 91-97页

作者： wang chenying YANG Shuming JING Weixuan REN Wei LIN Qijing ZHANG Yijun JIANG Zhuangde State Key Laboratory for Manufacturing Systems Engineering Xi'an Jiaotong University Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education & International Center for Dielectric Research Xi'an Jiaotong University

The current techniques used for the fabrication of nanosteps are normally done by layer growth and then ion beam thinning. There are also extra films grown on the step surfaces in order to reduce the roughness. So the whole process is time consuming. In this paper, a nanoscale step height structure is fabricated by atomic layer deposition （ALD） and wet etching techniques. According to the traceable of the step height value, the fabrication process is controllable. Because ALD technology can grow a variety of materials, aluminum oxide （Al2O3） is used to fabricate the nanostep. There are three steps of Al2O3 in this structure including 8 nm, 18 nm and 44 inn. The thickness of Al2O3 film and the height of the step are measured by anellipsometer. The experimental results show that the thickness of Al2O3 film is consistent with the height of the step. The height of the step is measured by AFM. The measurement results show that the height is related to the number of cycles of ALD and the wet etching time. The bottom and the sidewall surface roughness are related to the wet etching time. The step height is calibrated by Physikaliseh-Technische Bundesanstalt （PTB） and the results were 7.5±1.5 nm, 15.5±2.0 nm and 41.8±2.1 nm, respectively. This research provides a method for the fabrication of step height at nanoscale and the nanostep fabricated is potential used for standard references.

关键词： atomic layer deposition （ALD） wet etching step height

Fault Ride-through Hybrid Controller for MMC-HVDC Transmission System via Switching Control Units Based on Bang-bang Funnel Controller

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Journal of Modern Power Systems and Clean Energy 2023年第2期11卷 599-610页

作者： Yang Liu Zehui Lin chenying Xu Lei wang School of Electric Power Engineering South China University of TechnologyGuangzhou510640China

This paper proposes a fault ride-through hybrid controller(FRTHC)for modular multi-level converter based high-voltage direct current(MMC-HVDC)transmission systems.The FRTHC comprises four loops of cascading switching control units(SCUs).Each SCU switches between a bang-bang funnel controller(BBFC)and proportional-integral(PI)control loop according to a state-dependent switching law.The BBFC can utilize the full control capability of each control loop using three-value control signals with the maximum available magnitude.A state-dependent switching law is designed for each SCU to guarantee its structural stability.Simulation studies are conducted to verify the superior fault ride-through capability of the MMC-HVDC transmission system controlled by FRTHC,in comparison to that controlled by a vector controller(VC)and a VC with DC voltage droop control(VDRC).

关键词： Bang-bang funnel controller(BBFC) fault ride-through hybrid controller modular multi-level converter based high-voltage direct-current(MMC-HVDC) switching control unit

2~10μm台阶高度标准物质候选物的研制和质量评价

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计量学报 2024年第3期45卷 305-310页

作者：柳迪王琛英张雅馨王云祥王松陈伦涛王永录朱楠蒋庄德西安交通大学机械工程学院陕西西安710049 西安交通大学仪器科学与技术学院陕西西安710049 西安交通大学机械制造系统工程国家重点实验室陕西西安710049 苏州计量测试院江苏苏州215128

微米台阶高度标准物质用于校准仪器z轴性能,传递准确的微米高度量值。利用光刻结合干法刻蚀工艺实现公称高度为2,5,10μm台阶高度标准物质候选物的制备,并对台阶高度、粗糙度和上下表面平行度进行表征。使用激光共聚焦显微镜和非球面测... 详细信息

微米台阶高度标准物质用于校准仪器z轴性能,传递准确的微米高度量值。利用光刻结合干法刻蚀工艺实现公称高度为2,5,10μm台阶高度标准物质候选物的制备,并对台阶高度、粗糙度和上下表面平行度进行表征。使用激光共聚焦显微镜和非球面测量仪进行测量,基于双边算法、直方图法、ISO算法和光学显微解耦合准则(LEL)法对台阶高度进行评定,对于同一标准物质候选物各评定方法间的标准差均不超过0.024μm,台阶高度评定值的相对偏差均在5%以内,表明不同算法的评定结果一致性水平较高且量值可靠;不同仪器的评定结果对比,说明了评定方法之间也具有良好的一致性;同时,粗糙度不超过0.04μm,上下表面平行度不超过0.03°,验证了标准物质候选物制备效果良好。

关键词：微米计量台阶高度标准物质干法刻蚀粗糙度平行度