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High Density 3D Carbon Tube Nanoarray Electrode Boosting the Capacitance of Filter Capacitor

Nano-Micro Letters 2024年第11期16卷 242-254页

作者： Gan Chen Fangming Han Huachun ma Pei Li Ziyan Zhou Pengxiang Wang Xiaoyan Li Guowen Meng Bingqing Wei Key Laboratory of materials Physics and Anhui Key Laboratory of Nanomaterials and NanotechnologyInstitute of Solid State PhysicsHFIPSChinese Academy of SciencesHefei 230031People’s Republic of China department of materials Science and engineering University of Science and Technology of ChinaHefei 230026People’s Republic of China department of mechanical engineering University of DelawareNewarkDE 19716USA Mechano‑X Institute Applied Mechanics LaboratoryDepartment of Engineering MechanicsTsinghua UniversityBeijing 100084People’s Republic of China

Electric double-layer capacitors(EDLCs)with fast frequency response are regarded as small-scale alternatives to the commercial bulky aluminum electrolytic *** carbon-based nanoarray electrodes with precise alignment and smooth ion channels is crucial for enhancing EDLCs’***,controlling the density of macropore-dominated nanoarray electrodes poses challenges in boosting the capacitance of line-filtering ***,a simple technique to finely adjust the vertical-pore diameter and inter-spacing in three-dimensional nanoporous anodic aluminum oxide(3D-AAO)template is achieved,and 3D compactly arranged carbon tube(3D-CACT)nanoarrays are created as electrodes for symmetrical EDLCs using nanoporous 3D-AAO template-assisted chemical vapor deposition of *** 3D-CACT electrodes demonstrate a high surface area of 253.0 m^(2) g^(−1),a D/G band intensity ratio of 0.94.and a C/O atomic ratio of *** a result,the high-density 3D-CT nanoarray-based sandwich-type EDLCs demonstrate a record high specific areal capacitance of 3.23 mF cm^(-2) at 120 Hz and exceptional fast frequency response due to the vertically aligned and highly ordered nanoarray of closely packed CT *** 3D-CT nanoarray electrode-based EDLCs could serve as line filters in integrated circuits,aiding power system miniaturization.

关键词： Compactly arranged Three-dimensional carbon tube nanoarray Dimensional carbon tube nanoarray Fast frequency response Electric double-layer capacitors Layer capacitors AC line-filtering Filtering

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Neural Network Robust Control Based on Computed Torque for Lower Limb Exoskeleton

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Chinese Journal of mechanical engineering 2024年第2期37卷 83-99页

作者： Yibo Han Hongtao ma Yapeng Wang Di Shi Yanggang Feng Xianzhong Li Yanjun Shi Xilun Ding Wuxiang Zhang School of mechanical engineering and Automation Beihang UniversityBeijing 100191China Beihang Goer(WeiFang)Intelligent Robot Co. Ltd.Beihang UniversityWeifangChina Research Center of Satellite Technology Harbin Institute of TechnologyHarbinChina Beijing Xinfeng aerospace Equipment Co. LtdBeijingChina

The lower limb exoskeletons are used to assist wearers in various scenarios such as medical and industrial *** modeling errors of the exoskeleton in different application scenarios pose challenges to the robustness and stability of its control *** Radial Basis Function(RBF)neural network is used widely to compensate for modeling *** order to solve the problem that the current RBF neural network controllers cannot guarantee the asymptotic stability,a neural network robust control algorithm based on computed torque method is proposed in this paper,focusing on trajectory *** innovatively incorporates the robust adaptive term while introducing the RBF neural network term,improving the compensation ability for modeling *** stability of the algorithm is proved by Lyapunov method,and the effectiveness of the robust adaptive term is verified by the *** wearing the exoskeleton under different walking speeds and scenarios were carried out,and the results show that the absolute value of tracking errors of the hip and knee joints of the exoskeleton are consistently less than 1.5°and 2.5°,*** proposed control algorithm effectively compensates for modeling errors and exhibits high robustness.

关键词： Lower limb exoskeleton Model compensation RBF neural network Computed torque method

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Design,Testing and Control of a magnetorheological Damper for Knee Prostheses

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Journal of Bionic engineering 2024年第4期21卷 1788-1800页

作者： Hounan Song Yu Cao Wei Chen Lei Ren Yongxin ma Kunyang Wang Xu Wang Yao Zhang Luquan Ren Key Laboratory of Bionic engineering Ministry of EducationJilin UniversityChangchun130022People’s Republic of China department of mechanical Aerospace and Civil EngineeringThe University of ManchesterManchesterM139PLUK

This study aims to develop a magnetorheological(MR)damper for semi-active knee prostheses to restore the walking ability of transfemoral *** core dimensions of the MR damper were determined via theoretical magnetic field calculations,and the theoretical relationship between current and joint torque was derived through electromagnetic ***,a physical prototype of the semi-active prosthetic knee equipped with the MR damper was *** on the data obtained from angle sensor,pressure sensor(loadcell),and inertial measurement unit(IMU)on the prosthesis,a matching control algorithm is *** joint torque of the MR damper can be adaptively adjusted according to the walking speed of the amputee,allowing the amputee to realize a natural *** effectiveness of the control program was verified by the ADAMS and maTLAB *** results of the test and simulation show that the MR damper can provide sufficient torque needed for normal human activities.

关键词： Semi-active knee prosthesis magnetorheological damper Theoretical analysis ADAMS and maTLAB co-simulation

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Li-Zn alloy patch for defect-free polymer interface film enables excellent protection effect towards stable Li metal anode

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Chinese Chemical Letters 2024年第10期35卷 447-451页

作者： Zihao Wang Jing Xue Zhicui Song Jianxiong Xing Aijun Zhou Jianmin ma Jingze Li School of materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731China School of mathematics and Physics Weinan Normal UniversityWeinan 714099China School of Chemistry TiangongUniversityTianjin 300387China Huzhou Key Laboratory of Smart and Clean Energy Yangtze Delta Region Institute(Huzhou)University of Electronic Science and Technology of ChinaHuzhou313001China

Constructing a smart polymer film with favorable lithium(Li)transport capability and mechanical flexibility for suppressing Li dendrite growth is an effective ***,the porosity and the swelling of the polymer membrane cannot completely prevent liquid electrolyte from sweeping through the artificial protection film,severely deteriorating the cyclic ***,we propose a defectfree hybrid film that consists of Li+conductive lithium polyacrylate(LiPAA)polymer interface layer and Li-Zn alloy patch to tackle the critical problems of traditional polymer composite passivation *** pinhole leaks of the polymer matrix are self-filled by Li-Zn alloy patches,enhancing the integrity of LiPAA ***,a defect-free hybrid film is nailed flat against the Li metal anode,exhibiting extraordinary stability in the liquid electrolyte and enabling perfect protection *** facile strategy produces a promising anode for next generation Li batteries.

关键词： Limetal anode Patch Li-Zn alloy LiPAA Hybrid film

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SECOND ORDER TRANSIENT WAVES AROUND A VERTICAL CYLINDER IN A TANK

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Journal of Hydrodynamics 1995年第4期7卷 72-81页

作者： Q. W. ma, G. X. Wu(department of mechanical engineering university College London Torrington Place london WCIE 7JE )

The free surface problem bound by two cylinders is analysed based on the velocity potential theory. An analytical solution in the take domain is obtained up to the second order in the perturbation expansion. The results are compared with those obtainal from the fully nonlinear theory based on a finite element *** is found that the second order solutiongives a fsr better agreement with the fully nonlinear solution.

关键词： velocity potential analytical solution time domain fully nonlinear theory,transient waves vertical cylinder

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Efficient Electromagnetic Wave Absorption and Thermal Infrared Stealth in PVTMS@MWCNT Nano‑Aerogel via Abundant Nano‑Sized Cavities and Attenuation Interfaces

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Nano-Micro Letters 2024年第1期16卷 370-383页

作者： Haoyu ma maryam Fashandi Zeineb Ben Rejeb Xin Ming Yingjun Liu Pengjian Gong Guangxian Li Chul B.Park College of Polymer Science and engineering State Key Laboratory of Polymer Materials EngineeringSichuan University24 Yihuan RoadNanyiduanChengdu 610065SichuanPeople’s Republic of China Microcellular Plastics manufacturing Laboratory Department of Mechanical and Industrial EngineeringUniversity of Toronto5 King’s College RoadTorontoON M5S 3G8Canada Jiangsu JITRI Advanced Polymer materials Research Institute Tengfei Building88 Jiangmiao RoadJiangbei New DistrictNanjing 211800JiangsuPeople’s Republic of China MOE Key Laboratory of macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringInternational Research Center for X PolymersZhejiang University38 Zheda RoadHangzhou 310027People’s Republic of China

Pre-polymerized vinyl trimethoxy silane(PVTMS)@MWCNT nano-aerogel system was constructed via radical polymerization,sol-gel transition and supercritical CO_(2)*** fabricated organic-inorganic hybrid PVTMS@MWCNT aerogel structure shows nano-pore size(30-4. nm),high specific surface area(559 m^(2)g^(−1)),high void fraction(91.7%)and enhanced mechanical property:(1)the nano-pore size is beneficial for efficiently blocking thermal conduction and thermal convection via Knudsen effect(beneficial for infrared(IR)stealth);(2)the heterogeneous interface was beneficial for IR reflection(beneficial for IR stealth)and MWCNT polarization loss(beneficial for electromagnetic wave(EMW)attenuation);(3)the high void fraction was beneficial for enhancing thermal insulation(beneficial for IR stealth)and EMW impedance match(beneficial for EMW attenuation).Guided by the above theoretical design strategy,PVTMS@MWCNT nano-aerogel shows superior EMW absorption property(cover all Ku-band)and thermal IR stealth property(ΔT reached 60.7℃).Followed by a facial combination of the above nano-aerogel with graphene film of high electrical conductivity,an extremely high electromagnetic interference shielding material(66.5 dB,2.06 mm thickness)with superior absorption performance of an average absorption-to-reflection(A/R)coefficient ratio of 25.4.and a low reflection bandwidth of 4.1 GHz(A/R ratio more than 10)was experimentally obtained in this work.

关键词： Nano-pore size Heterogeneous interface Electromagnetic wave absorption Thermal infrared stealth Nano-aerogel

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Design and optimization of the seed conveying system for belt-type highspeed corn seed guiding device

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International Journal of Agricultural and Biological engineering 2024年第2期17卷 123-131页

作者： Yifei Li Wenqi Zhou Chengcheng ma Zhaohua Feng Jinwu Wang Shujuan Yi Song Wang College of engineering Northeast Agricultural UniversityHarbin 150030China College of engineering Heilongjiang Bayi Agricultural UniversityDaqing 163000HeilongjiangChina Agricultural engineering department Qitaihe Vocational Technician CollegeQitaihe 154600HeilongjiangChina

Seeding is an important part of improving corn ***,seed guide tubes are mostly used as transport *** the existing seed guide tubes cannot meet the requirements or achieve the goal of fixing the seed falling trajectory.A seed collision phenomenon occurs ***,in response to the problems that the seeds and seed guide tube collide or bounce under high speed operation,which results in a lower sowing qualification rate and poor spacing uniformity,a seed receiving and conveying system comprising a belt-type high-speed corn seed guiding device was designed and optimized,to meet the needs of high-speed precision sowing operations and improve the spacing *** factors affecting the seed conveying performance were obtained by analyzing the mechanical properties of the seeds at various movement *** factors were the number of seed cavities between adjacent seeds,the forward speed,the height from the ground,and the installation *** factor simulation experiments were conducted by selecting the paddle spacing as the test factor and using the pass rate,reseeding rate,omission rate and coefficient of variation as the evaluation indexes to investigate the influence of the paddle spacing on the seed guide performance of the device and further determine the structural parameters of the paddle *** rotation combination tests of three factors and five levels were also conducted through bench *** the test outcomes were *** results indicated that the best results were obtained when the number of seed cavity intervals between adjacent seeds was 5.16,the installation angle was 79.4.°,and the height from the ground was 31.84.*** this time,the qualified rate was 98.4.%,the repeated sowing rate was 0.4.%,the missed sowing rate was 1.03%,and the coefficient of variation was 6.80%.Experiments were used to validate the optimization results,and all of the obtained index data satisfied the criteria for accurate

关键词： corn high-speed sowing belt-type seed guide device test

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基于模糊逻辑的拥塞控制研究

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计算机科学 2004年第6期31卷 33-35,111页

作者：徐跃东关治洪王华华中科技大学控制科学与工程系武汉430074 波士顿大学航空与机械工程系

本文针对Internet拥塞控制提出一种新的基于模糊逻辑的主动队列管理策略。队列的状态转换成为语言变量输入,通过依据经验定义的模糊推理计算数据包的丢弃率。仿真结果表明采用模糊逻辑的主动队列管理策略具有良好的性能和鲁棒性。

关键词：模糊逻辑拥塞控制主动队列管理语言变量输入 TCP 鲁棒性

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Nonlinear Finite Element Analysis of Paper Movement in Air

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International Journal of Plant engineering and management 2000年第2期5卷 55-61页

作者： ma Junxing Yang Shengjun Xue Jijun and He Zhengiia (department of mechanical engineering, Xi’an Jiaotong university, China)

In order to improve the office paper feeder design, and eliminate paper jam fault in running office equipment, the static deformation and dynamic response of paper were analyzed by use of the Finite Element Method (FEM). In the analysis, the three nodes mangle plate and shell element were employed, and finite element incremental formulations were derived on the basis of Updated Lagrangian (U.L) description. The newmark method was used to analyze the transient response of paper. All the results calculated in this article coincide with those by experiments.

关键词： paper office equipment geometrically nonlinear finite element method dynamic analysis

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Research on Nanofabrication Technology of Micro-/Nano-Stereo Rapid Prototyping of PCVD

Research on Nanofabrication Technology of Micro-/Nano-Stereo...

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第十届国际制造工程与管理会议

作者： ZHENG Wei, Sandy TO, WANG Er-qi, LIN Yu-yi(1. department of Mechatronics, Xiamen university, Xiamen 361005, China 2. Ultra-Precision machining Centre, department of Industrial and Systems engineering,The Hong Kong Polytechnic university, Hung Hom, Kowloon, Hong Kong, China 3. College of Computer and Information engineering,Xiamen university, Xiamen 361005, China 4. department of mechanical and aerospace engineering,university of Missouri-Columbia, Columbia, MO 65211, usa)

＜正＞ At present, the most common micro/nano-scale fabrication processes include the plane silicon process based on IC technology, stereo silicon process, LIGA, quasi-LIGA based on near ultra violet deep lithography, MEMS, energy beam etching and micro/nano-machining, etc. A common problem for these processes is the difficulty to fabricate arbitrary form for 3-dimensional micro/nano-parts, devices or mechanisms. To develop advanced MEMS manufacturing technology, and to achieve fabrication of true 3-dimensional parts, devices or mechanisms, this paper proposes a nanofabrication technology for rapid prototyping of 3-dimensional parts, using plasma chemical vapor deposition （PCVD）. This process can be describes as follows;A laser beam is produced by a low power, quasi molecule laser. It enters the vacuum chamber through a window, and is focused on with the substrate surface. A gas in the chamber is ionized by the laser beam to produce PCVD on the substrate surface, and forms a particle of the size of Φ100 nm （its thickness is about 100 nm）. When the laser beam moves along X-axis, many particles form a line. Then the laser beam moves one step in Y-axis to form a new line. A plane is completed by many lines. Then the substrate moves in Z-axis to form new plane. Eventually, many planes form a 3-dimensional component. Using available CAD/CAM software with this process, rapid prototyping of complex components can be achieved. A nanometer precision linear motor, such as that described in Chinese national patent （patent No. ZL 98 2 16753. 9）, can be used to obtain the nanometer precision movements in the process. The process does not require mask, can be used for various rapid prototyping materials, to obtain high fabrication precision （its scale precision is 15 nm）, and larger ratio of height to width of micro/nano-structure. It can find widespread applications in the fabrication of micro-mechanism, trimming IC, and fabricating minilens, etc.

关键词： plasma nanofabrication rapid prototyping advanced manufacturing technology micro/nano-technology

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