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Fabrication and measurement of high-g MEMS accelerometer

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仪器仪表学报 2008年第7期29卷 1345-1349页

作者： shi yunbo Liu Jun Qi Xiaojin Meng Meiyu National Key Lab for Electronic Measurement and Technology North University of China Taiyuan 030051 China Department of Mechanical Engineering University of California Berkeley. Berkeley CA 94720 USA

A high-g beam-mass structure accelerometer was *** this structure,by means of KOH back etching on the mass,V-groove structure was fabricated on the backside of the mass,so the weight of the mass and also the relative distance between the mass center and the neutral plane were all *** the thin mass structure,we can take advantage of both beam-mass structure and flat film structure;the fabrication process is also *** means of Hopkinson shock test system,we did the accelerometer *** to the test result,the sensitivity of the MEMS accelerometer is 0.71 μV/g,which keeps in accordance with the theoretical *** a 200 000 g shocking test,the micro structure worked as usual,so this design can satisfy the requirements of high shock,seriously vibration test environment.

关键词：测量方法加速度计冲击实验振动实验

Optimization design of extensor for improving locomotion efficiency of inchworm-like capsule robot

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Science China(Technological Sciences) 2019年第11期62卷 1930-1938页

作者： GAO JinYang YAN GuoZheng shi yunbo CAO HuiLiang HUANG Kun LIU Jun Science and Technology on Electronic Test and Measurement Laboratory North University of ChinaTaiyuan 030051China Shanxi Key Laboratory of Advanced Manufacturing Technology North University of ChinaTaiyuan 030051China Department of Instrument Science and Engineering Shanghai Jiaotong UniversityShanghai 200240China

An inchworm-like capsule robot(ILCR) is a promising device for a minimally invasive diagnosis and treatment of colon diseases. It consists of two expanders and one extensor, the former provides a traction force by expanding the colon and the latter can elongate and retract to enable active locomotion. However, the locomotion efficiency of the ILCR can be seriously lowered by the complex colon environment featuring slippery, viscoelastic, and suspend properties, which has been a main obstacle to its clinical application. This paper aims at improving the locomotion efficiency of the ILCR by optimizing its extensor design. To do this, the locomotion resistance of the ILCR in the colon is analyzed, and complying with a requirement that the traction force must be larger than the locomotion resistance to avoid slipping, a restriction on the extensor design is obtained. Then under the restriction and with reference to the Hyperelastic model which correlates stress and strain of colon tissue, a model for analyzing the influence of the design parameters of the extensor on the locomotion efficiency of the ILCR is built. With this model, the extensor has been optimized and the optimized results have been used to guide the development of a novel extensor, which employs two pairs of lead-screws and nuts and is actuated by one motor. Ex-vivo experiment has shown that the novel extensor can improve the locomotion efficiency of an ILCR prototype by 57%, without changing its total length.

关键词： inchworm-like capsule robot extensor design locomotion resistance locomotion efficiency

Integrated Gas Sensor Based on MEMS

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稀有金属材料与工程 2006年第A03期35卷 173-175页

作者： Hongquan Zhang Tong Zhang Likai Sun yunbo shi Jianying Guo Harbin University of Science and Technology Harbin 150080 China Automobile Electronic Engineering Technology Research and Development Center Harbin 150001 China Northeast Transducer Technology Research Institute Harbin 150001 China

Integrated gas sensor suspending bridge style micro-structure has been developed on Al_2O_3 new type membrane based on ***_4 gas sensing unit and CO gas sensing unit were fabricated separately on 4 unit array style suspending bridge *** have studied on time-sequence modulation form voltage pulse heating method which forms different work temperature

关键词： Al2O3 membrane micro-structure gas sensor

Suppression of low-frequency ultrasound broadband vibration using star-shaped single-phase metamaterials

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Defence Technology（防务技术） 2024年第4期34卷 217-224页

作者： Rui Zhao Jian Zheng Jin Guo yunbo shi Hengzhen Feng Jun Tang Jun Liu Science and Technology on Electronic Test&Measurement Laboratory North University of ChinaTaiyuan 030051ShanxiChina School of Mechatronical Engineering Beijing Institute of TechnologyBeijing 100081China

In order to suppress the low-frequency ultrasound vibration in the broadband range of 20 k Hz—100 k Hz,this paper proposes and discusses an acoustic metamaterial with low-frequency ultrasound vibration attenuation properties,which is configured by hybrid arc and sharp-angle convergent star-shaped *** effect of the dispersion relation and the bandgap characteristic for the scatterers in star-shaped are simulated and *** target bandgap width is extended by optimizing the geometry parameters of arc and sharp-angle convergent *** proposed metamaterial configured by optimized hybrid lattices exhibits remarkable broad bandgap characteristics by bandgap complementarity,and the simulation results verify a 99%vibration attenuation amplitude can be obtained in the frequency of20 k Hz—100 k *** the fabrication of the proposed hybrid configurational star-shaped metamaterial by 3D printing technique,the transmission loss experiments are performed,and the experimental results indicate that the fabricated metamaterial has the characteristics of broadband vibration attenuation and an amplitude greater than 85%attenuation for the target *** results demonstrate that the hybrid configurational star-shaped metamaterials can effectively widen the bandgap and realize high efficiency attenuation,which has capability for the vibration attenuation in the application of highprecise equipment.

关键词： Star-shaped metamaterials Broadband Vibration attenuation Low-frequency ultrasound vibration Transmission loss

Study on Environmental Multi-parameter Sensor Based on MEMS

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稀有金属材料与工程 2006年第A03期35卷 377-380页

A new membrane type Al_2O_3 micromachining material is *** develop an environmental multi-parameter detection micro-system,which implements the detection to temperature,humidity,wind speed,and *** test results illustrate that the heat-release unit in micro-system intercross greatly affects other sensing units on the *** study the method of etching process,which formed cavity to reduce the heat exchange efficiency and decrease temperature intercross effect.

关键词： Al2O3 membrane sensing unit environmental multi-parameter microsystem

Research on the variation of dielectric properties of oil-paper insulation for power equipment over a wide temperature range

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High Voltage 2024年第3期9卷 648-658页

作者： Mingze Zhang Muhe Yu Wen Zhou Yilin Liang Shengjie Lei yunbo shi Limin Qu Key Laboratory of Engineering Dielectrics and Its Application Ministry of Education Harbin University of Science and TechnologyHarbinChina School of Measurement and Communication Engineering Harbin University of Science and TechnologyHarbinChina Electric Power Research Institute State Grid Heilongjiang Electric Power Company LimitedHarbinChina

The main part of oil-immersed power equipment is oil-paper *** lower ambient temperatures,transformer oil will become *** a result,compared to those at room temperature or operating temperature,the frequency domain dielectric properties of oil-paper insulation at low temperatures are drastically *** evaluating the insulation condition of electrical equipment,it is essential to accurately determine their dielectric *** paper described the FDS test,the DC conductivity test,and the transformer oil viscosity test,which was carried out in a laboratory environment for different ageing of oil-immersed pressboard and transformer oil at 233–373 *** ef-fects of temperature on the dielectric properties at the competing mechanisms of polarisation and conductivity loss were clarified based on variations of the FDS *** the viscosity change of ageing transformer oil at low temperatures,the Arrhenius and VFT viscosity equations were used to achieve a fitting calculation in the different temperature *** on the molecular/ion transition model in the force field and electric field,the characterisation relationships between the dynamic viscosity,DC conductivity,and test temperature of transformer oil were *** limita-tions of conventional transformer oil equivalent dielectric relaxation models over a wide temperature range were finally clarified by combining the test findings of the DC con-ductivity over a wide temperature range with observed and simulated *** paper provides an essential theoretical reference when using the FDS test to diagnose the insulation performance of oil-immersed power equipment in extremely cold regions.

关键词： insulation viscosity immersed

Exploration of Integrated Course Project Mode of the Internet of Things Engineering Based on the Relevance Theory

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国际计算机前沿大会会议论文集 2016年第2期 10-11页

作者： Qiaohua Feng Wenjie Zhao Xiaoyu Yu yunbo shi Institute of Measurement-Control Technology and Communications Engineering Harbin University of Science and TechnologyHarbin150080China

Based on analysis of the present situation and problems of course project of the Internet of Things engineering,we propose a relational integrated course project pattern around three levels of perception layer,network layer,application layer of the Internet of Things *** realization of a complete Internet of Things system is divided into three course projects to complete three key points,which may eventually make a complete system of *** the link among the three integrated course projects,knowledge of four years will be connected together and form an organic *** use a team performance and examination methods of the process-oriented examination,project paper and oral examination for the integrated course project in order to improve students’cooperation ability,expression ability,communication ability and other integrated quality.

关键词： The Internet of Things engineering Relevance Integrated course project Process inspection

Characterization of the current crowding effect on chip surface using a quantum wide-field microscope

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Chinese Optics Letters 2024年第6期22卷 123-128页

作者： Rui Zhao Ding Wang Huan Fei Wen yunbo shi Jun Tang Jun Liu Science and Technology on Electronic Test&Measurement Laboratory North University of ChinaTaiyuan 030051China

We characterize the current crowding effect for microwave radiation on a chip surface based on a quantum wide-field microscope combining a wide-field reconstruction technique. A swept microwave signal with the power of 0–30 d Bm is supplied to a dumbbell-shaped microstrip antenna, and the significant differences in microwave magnetic-field amplitudes attributed to the current crowding effect are experimentally observed in a 2.20 mm ×1.22 mm imaging area. The normalized microwave magnetic-field amplitude along the horizontal geometrical center of the image area further demonstrates the feasibility of the characterization of the current crowding effect. The experiments indicate the proposal can be qualified for the characterization of the anomalous area of the radio-frequency chip surface.

关键词： current crowding effect microwave field on chip surface quantum wide-field microscope nitrogen-vacancy center

探寻五四的传统渊源——余英时的五四观及文化重建论

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江苏大学学报（社会科学版） 2009年第3期11卷 29-33页

作者：史云波江苏大学人文社会科学学院江苏镇江212013

余英时在相对承认"外缘论"的基础上,独辟蹊径,采取"内在理路"的分析框架,揭示五四文化运动的传统渊源,实现了五四思想史研究范式的转变。由于时代背景和历史文化特点不同,余英时反对以西方的文艺复兴或启蒙运动比附五四新文化运动,认为... 详细信息

余英时在相对承认"外缘论"的基础上,独辟蹊径,采取"内在理路"的分析框架,揭示五四文化运动的传统渊源,实现了五四思想史研究范式的转变。由于时代背景和历史文化特点不同,余英时反对以西方的文艺复兴或启蒙运动比附五四新文化运动,认为中国不需要文艺复兴,启蒙之说在中国也是无根的。他一方面肯定五四的价值,一方面对五四的缺点给予无情的批判,主张继承五四,超越五四,在对中西文化正确认识的基础上,正确处理传统与现代、中学与西学的关系,潜心研究,以退而结网的精神重建中国文化。

关键词：余英时五四观内在理路文化重建