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Langasite-based SAW high-temperature vibration sensor with temperature decoupling

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Science China(Technological Sciences) 2024年第6期67卷 1946-1956页

作者： ZHANG Juan CHENG WenHua WANG Hao ZHANG Lei LI XiangRong MA HongShuai PANG JunQi TAN QiuLin State Key Laboratory of Dynamic Measurement Technology North University of ChinaTaiyuan030051China Department of Mechanical Engineering Taiyuan Institute of TechnologyTaiyuan030008China

Monitoring high-temperature vibrations is critical in aerospace engineering,industrial manufacturing,and energy production,where harsh conditions necessitate robust vibration sensors for detecting anomalous ***,the accuracy of such sensors is often compromised by crosstalk between temperature and vibration *** study introduces a high-temperature vibration sensor based on langasite(LGS)surface acoustic wave(SAW)technology,designed to withstand temperatures up to 500℃.The sensor demonstrates high sensitivity,ranging from 12.54 kHz/g at 25℃ to 15.63 k Hz/g at 500℃.A comprehensive mechanical and electrical coupling model for the SAW vibration sensor was developed by integrating theoretical equations with numerical simulations to optimize the sensor's ***,a novel decoupling algorithm for temperature and vibration was established,achieving thermomechanical decoupling with precise vibration *** results indicated a maximum relative deviation of 4.67%for the *** conclusion,the proposed LGS SAW vibration sensor emerges as a promising solution for the accurate detection of multiple parameters in high-temperature vibration monitoring.

关键词： high temperature langasite(LGS) surface acoustic wave(SAW) piezoelectric vibration sensor temperature decoupling

Forecast for peak infections in the second wave of the Omicron after the adjustment of zero-COVID policy in the mainland of China

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Infectious Disease Modelling 2023年第2期8卷 562-573页

作者： Sheng-Tao Wang Yong-Ping Wu Li Li Yong Li Gui-Quan Sun Complex Systems Research Center Shanxi UniversityTaiyuan030006China College of Physical Science and Technology Yangzhou UniversityYangzhou225002China School of Computer and Information Technology Shanxi UniversityShanxiTaiyuan030006China School of Information and Mathematics Yangtze UniversityJingzhou434023China School of Mathematics North University of ChinaShanxiTaiyuan030051China

On December 7,2022,the Chinese government optimized the current epidemic prevention and control policy,and no longer adopted the zero-COVID policy and mandatory quarantine *** on the above policy changes,this paper establishes a compartment dynamics model considering age distribution,home isolation and *** estimation was performed using improved least squares and Nelder-Mead simplex algorithms combined with modified case ***,using the estimated parameter values to predict a second wave of the outbreak,the peak of severe cases will reach on 8 May 2023,the number of severe cases will reach 206,***,it is proposed that with the extension of the effective time of antibodies obtained after infection,the peak of severe cases in the second wave of the epidemic will be delayed,and the final scale of the disease will be *** the effectiveness of antibodies is 6 months,the severe cases of the second wave will peak on July 5,2023,the number of severe cases is 194,***,the importance of vaccination rates is demonstrated,when the vaccination rate of susceptible people under 60 years old reaches 98%,and the vaccination rate of susceptible people over 60 years old reaches 96%,the peak of severe cases in the second wave of the epidemic will be reached on 13 July 2023,when the number of severe cases is 166,000.

关键词： Omicron Parameter estimation The zero-COVID policy The severe cases Nelder-Mead Simplex direct search algorithm

细胞电拉伸方法的优化和阿霉素对白血病NB4细胞的硬度影响分析（英文）

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生物化学与生物物理进展 2018年第3期45卷 363-374页

作者：白国花王文玺谭秋林中北大学仪器科学与动态测试教育部重点实验室

研究表明,细胞的变形能力能够作为一个有效的生物标志,用来指示疾病的发展状况.由于细胞异质性的障碍,发现利用已报道的实验条件对新细胞进行电拉伸很困难.本论文中,一种基于介电泳-微流控的细胞电拉伸方法得到优化,并利用此优化方法进... 详细信息

研究表明,细胞的变形能力能够作为一个有效的生物标志,用来指示疾病的发展状况.由于细胞异质性的障碍,发现利用已报道的实验条件对新细胞进行电拉伸很困难.本论文中,一种基于介电泳-微流控的细胞电拉伸方法得到优化,并利用此优化方法进行了阿霉素对白血病NB4细胞硬度影响的调查.首先,用于细胞捕获的正向介电泳(pDEP)方法被优化和证实.结果指出,如果细胞缓冲液的电导率足够地低,低至细胞的截止频率能够出现,同时,电场的频率被调至高低截止频率范围之间时,细胞的pDEP效应容易实现.其次,系统地讨论了影响细胞变形量的三个参数.结果指出,细胞缓冲液的电导率低于细胞质的电导率是细胞电变形的先决条件,此外,增大电压或减小频率也能促使细胞变形.最后,借助优化的细胞电拉伸方法,调查了细胞机械特性和细胞功能变化之间的关系.结果表明,阿霉素使NB4细胞产生凋亡而变硬.总之,本文提出了一种新的细胞电拉伸方法,以便对细胞的变形能力进行简单有效的检测.

关键词：电拉伸微流控细胞硬度正向介电泳截止频率

ON THE GRAPHS OF PRODUCTS OF CONTINUOUS FUNCTIONS AND FRACTAL DIMENSIONS

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Acta Mathematica Scientia 2023年第6期43卷 2483-2492页

作者：刘佳石赛赛张远 Institute of Statistics and Applied Mathematics Anhui University of Finance and Econo Bengbu233030China

In this paper,we consider the graph of the product of continuous functions in terms of Hausdorff and packing *** precisely,we show that,given a real number 1≤β≤2,any real-valued continuous function in C([0,1])can be decomposed into a product of two real-valued continuous functions,each having a graph of Hausdorff dimensionβ.In addition,a product decomposition result for the packing dimension is *** work answers affirmatively two questions raised by Verma and Priyadarshi[14].

关键词： Hausdorff dimension packing dimension graph of function product of functions

Alumina Ceramic Based High-Temperature Performance of Wireless Passive Pressure Sensor

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Photonic Sensors 2016年第4期6卷 328-332页

作者： Bo WANG Guozhu WU Tao GUO Qiulin TAN School of Computer Science and Control Engineering North University of China Taiyuan 030051 China Key Laboratory of Instrumentation Science & Dynamic Measurement Ministry of Education North University of China Taiyuan 030051 China Science and Technology on Electronic Test and Measurement Laboratory North University of China Taiyuan 030051 China

A wireless passive pressure sensor equivalent to inductive-capacitive （LC） resonance circuit and based on alumina ceramic is fabricated by using high temperature sintering ceramic and post-fire metallization processes. Cylindrical copper spiral reader antenna and insulation layer are designed to realize the wireless measurement for the sensor in high temperature environment. The high temperature performance of the sensor is analyzed and discussed by studying the phase-frequency and amplitude-frequency characteristics of reader antenna. The average frequency change of sensor is 0.68 kHz/℃ when the temperature changes from 27℃ to 700℃ and the relative change of twice measurements is 2.12%, with high characteristic of repeatability. The study of temperature-drift characteristic of pressure sensor in high temperature environment lays a good basis for the temperature compensation methods and insures the pressure signal readout accurately.

关键词： Pressure sensor wireless passive high temperature zero drift resonant frequency

Thermodynamic descriptions of quaternary Mg-Al-Zn-Bi system supported by experiments and their application in descriptions of solidification behavior in Bi-additional AZ casting alloys

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Journal of Magnesium and Alloys 2020年第4期8卷 1238-1252页

作者： Ying Tang Yongsheng Li Weimin Zhao Irina Roslyakova Lijun Zhang School of Materials Science and Engineering.Hebei University of Technology Tianjin 300130PR China ICAMS Ruhr-Universitat BochumUniversitdtsstrasse15044801 BochumGermany State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083PR China

16 Mg-Al-Zn-Bi quaternary alloys were utilized to measure the phase equilibria and transformation temperatures in the Mg-rich Mg-Al-Zn-Bi quaternary system by means of the X-ray diffraction,electron probe micro-analysis and differential scanning calorimetry *** isothermal section at 400℃and three vertical sections along Mg-8 wt%Al-0.75 wt%Zn-vBi,Mg-3.4 wt%Al-0.5 wt%Zn-ABi and Mg-6.9 wt%Al-2.3 wt%Zn-xBi in the Mg-Al-Zn-Bi quaternary system were *** on the literature data,the ternary Mg-Al-Bi and Mg-Bi-Zn systems were re-assessed using the CALculaiton of PHAse Diagram(CALPHAD)*** calculated phase equilibria agree well with the measured *** directly extrapolating the constituent sub-ternary systems,the thermodynamic database for the Mg-Al-Zn-Bi quaternary system was *** remarkable consistency between the predicted phase equilibria and the presently measured data in Mg-Al-Zn-Bi quaternary system further demonstrated the accuracy and reliability of the established thermodynamic *** that,by using the newly developed thermodynamic database,the growth restrict factors and the solidification curves in Bi-containing AZ series magnesium alloys were calculated and *** was confirmed that the grain size of AZ alloys can be refined with the addition of Bi,and the comp on ent Al had larger grain refinement effect than ***,the amount of Bi had also no ticeable effect on the solidification sequence of the AZ alloys.

关键词： Mg-Al-Zn-Bi quaternary system Phase equilibira CALPHAD Thermodynamics Solidification behavior.

Flexible artificial synapse based on single-crystalline BiFeO_(3) thin film

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Nano Research 2022年第3期15卷 2682-2688页

作者： Zhen Zhao Amr Abdelsamie Rui Guo Shu Shi Jianhui Zhao Weinan Lin Kaixuan Sun Jingjuan Wang Junling Wang Xiaobing Yan Jingsheng Chen Key Laboratory of Brain-like Neuromorphic Devices and Systems of Hebei province College of Electron and Information EngineeringHebei UniversityBaoding 071002China Department of Materials Science and Engineering Nanyang Technological UniversitySingapore 639798Singapore Department of Materials Science and Engineering National University of SingaporeSingapore 117576Singapore Department of Physics Southern University of Science and TechnologyShenzhen 518055China

Realization of functional flexible artificial synapse is a significant step toward neuromorphic ***,a flexible artificial synapse based on ferroelectric tunnel junctions(FTJs)is demonstrated,using BiFeO_(3)(BFO)thin film as the functional *** inorganic single crystalline FTJs grown on rigid perovskite substrates at high temperatures are integrated with the flexible plastic substrates,by using the water-soluble Sr_(3)Al_(2)O_(6)(SAO)as the sacrificial layer and the following *** transferred freestanding BFO thin film exhibits excellent ferroelectric ***,the memristive properties and the brain-like synaptic learning performance of the flexible FTJs are *** results show that multilevel resistance states were maintained well of the flexible artificial synapse,together with their stable synaptic learning *** work indicates the promising opportunity of ferroelectric thin film based flexible synapse used in the future neuromorphic computing system.

关键词： flexible ferroelectricity memristor artificial synapse

Potential application of radiant floor cooling systems for residential buildings in different climate zones

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Building Simulation 2024年第4期17卷 543-560页

作者： Mengying Cui Yang Song Yudong Mao Kaimin Yang Jiying Liu Zhe Tian School of Thermal Engineering Shandong Jianzhu UniversityJinan250101China School of Environmental Science and Engineering Tianjin UniversityTianjin300072China Key Lab of Building Environment and Energy of Tianjin Tianjin UniversityTianjin300072China

A radiant floor cooling system(RFCS)is a high-comfort and low energy consumption system suitable for residential *** floor systems usually work with fresh air,and their operating performance is affected by climatic *** and outdoor environmental disturbances and the system’s control strategy affect the indoor thermal comfort and energy efficiency of the ***,a multi-story residential building model was established in this *** system simulation program was used to study the operation dynamics of three control strategies of the RFCS based on the calibrated ***,the performance of the control strategies in five climate zones in China were compared using multi-criteria decision-making in *** results show that control strategy has a negligible effect on condensation risk,but the thermal comfort and economic performance differ for different control *** adaptability of different control strategies varies in different climate zones based on the consideration of multiple *** performance of the direct-ground cooling source system is better in Hot summer and warm winter *** variable air volume control strategy scores higher in Serve cold and Temperate zones,and the hours exceeding thermal comfort account for less than 3%of the total simulation ***,it is suggested to choose the RFCS control strategy for residential buildings according to the climate zone characteristics,to increase the energy *** results provide a reliable reference for implementing RFCSs in residential buildings.

关键词： control strategy radiant floor cooling system residential building energy efficiency climate zones

Effect of Corrosive Ions (Cl^-,SO4^2-,and Mg^2+) on the Nanostructure and Chloride Binding Property of C-A-S-H Gel

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Journal of Wuhan University of Technology(Materials Science) 2020年第6期35卷 1061-1072页

作者： JIN Shucheng LIU Kai ZHANG Gaozhan SHI Hua DING Qingjun XU Wenyuan School of Civil Engineering Northeast Forestry UniversityHarbin 150040China China Construction Ready Mixed Concrete Co. LtdWuhan 430200China School of Materials and Chemical Engineering Anhui Jianzhu UniversityHefei 230601China School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China

The nanostructure and chloride binding capacity evolution of C-A-S-H gel exposed to aggressive solutions were investigated,utilizing 29Si NMR,27Al NMR,SEM-EDS,and XRD *** experimental results show that while Cl-ions show a smaller effect on the microstructure of C-A-S-H sample,and SO4^2-ions can react with C-A-S-H,resulting in decreasing Ca/Si and Al[4]/Si for the C-A-S-H gel (i e,decalcification and dealuminization).The presence of Mg^2+ ions can aggravate the decalcifying and dealuminizing effects of SO4^2-ions on the *** decreasing Ca/Si ratio and aluminum substitution for the original C-A-S-H gel,the depolymerization degree of silicate tetrahedra increases and the calcium aluminosilicate skeleton strengthens.C-A-S-H gel with lower Ca/Si ratio and higher Al[4]/Si ratio shows gentler nanostructure evolution under chemical attack,i e,improving thermodynamic stability under chemical ***,the chloride binding capacity of C-A-S-H gel is decreased after the sulfate *** substitution can also help C-A-S-H gel resist the degraded chloride binding capacity induced by sulfate attack.

关键词： calcium-silicate-hydrate ions attack Ca/Si ratio Al/Si aluminum uptake