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Differential Quasi-Yagi Antenna and Array

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ZTE Communications 2023年第3期21卷 37-44页

作者： zhu zhihao ZHANG Yueping Key Laboratory of Ministry of Education of Design and Electromag-netic Compatibility of High-Speed Electronic Systems Shanghai Jiao Tong UniversityShanghai 200240China Nanyang Technological University Singapore 639798Singapore

A novel differential quasi-Yagi antenna is first presented and compared with a normal single-ended *** simulated and measured results show that the differential quasi-Yagi antenna outperforms the conventional single-ended *** differential quasi-Yagi antenna is then used as an element for linear arrays.A study of the coupling mechanism between the two differential and the two singleended quasi-Yagi antennas is conducted,which reveals that the TE0 mode is the dominant mode,and the driver is the decisive part to account for the mutual ***,the effects of four decoupling structures are respectively evaluated between the two differential quasi-Yagi ***,the arrays with simple but effective decoupling structures are fabricated and *** measured results demonstrate that the simple slit or air-hole decoupling structure can reduce the coupling level from−18 dB to−25 dB and meanwhile maintain the impedance matching and radiation patterns of the array over the broad *** differential quasi-Yagi antenna should be a promising antenna candidate for many applications.

关键词： differential quasi-Yagi antenna and array mutual coupling surface wave

Effect of combined electromagnetic fields on surface quality and structure of a HDC casting 5182 Al alloy ingot

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Acta Metallurgica Sinica(English Letters) 2012年第6期25卷 453-460页

作者： Qingfeng zhu zhihao ZHAO Yubo ZUO Xiangjie WANG Jianzhong CUI Key Laboratory of Electromagnetic Processing of Materials Ministry of Education Northeastern University Shenyang 110819 China

5182 Al alloy ingots with the diameters of 100 mm are produced by conventional and combined electromagnetic fields （CEMF） horizontal direction chill （HDC） cast- ing process. The effect of CEMF on the ingot surface quality and floating grains is investigated. The results show that the CEMF is effective in reducing the segregation layer in both top and bottom sub-surfaces. Big floating grains with coarse dendrite arms mainly distribute in the crescent-shaped area near the bottom in the conven- tional HDC casting ingot. With the application of the CEMF, they disappear in the whole cross section of the HDC casting ingot and the equiaxed grains are significantly refined.

关键词： Aluminum alloy Combined electromagnetic field Horizontaldirect chill casting Structure Surface quality

Investigation of Out-Phase Electromagnetic Casting of Aluminum Alloy

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稀有金属材料与工程 2009年第A3期38卷 73-77页

作者： Zhao zhihao zhu Qingfeng Wang Xiangjie Cui Jianzhong Key Laboratory of Electromagnetic Processing of Materials Ministry of Education Northeastern University Shenyang 110004 China

The influences of out-phase electromagnetic field on the as-cast structure of horizontal direct chill casting aluminum alloy ingot were experimental by and numerical by studied. The results of numerical analysis show that the interaction of the out-phase electromagnetic field and the melt can generate an electromagnetically induced forced flow in the melt, which, in turn, changes flow pattern and temperature field in the mold. The as-cast structure of the ingot can be greatly improved by the changes of flow pattern and temperature field. The results of experimental analysis show that with application of out-phase electromagnetic field, temperature distribution in the melt is more uniform, grain morphology changes from columnar grains to equiaxed grains and grain size decreases.

关键词：铝合金异相电磁场电磁感应温度

Effect of polytetrafluoroethylene hollow fiber microstructure on formaldehyde carbonylation performance in membrane contactor

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Chinese Journal of Chemical Engineering 2023年第3期55卷 148-155页

作者： zhihao zhu Ying Sun Haijun Yu Meng Li Xingming Jie Guodong Kang Yiming Cao Dalian National Laboratory for Clean Energy(DNL) Dalian Institute of Chemical Physics(DICP)Chinese Academy of Sciences(CAS)Dalian 116023China School of Chemistry and Chemical Engineering Anqing Normal University(AQNU)Anqing 246011China

Membrane contactor is regarded as a promising method for reaction and process intensification. The feasibility of formaldehyde carbonylation to synthesize glycolic acid using polytetrafluoroethylene(PTFE)membrane contactor has been proved in our previous study. In this paper, the effect of membrane microstructure on process performance was further investigated. Three porous PTFE hollow fibers with different pore sizes and one polydimethylsiloxane(PDMS)/PTFE composite membrane with dense layer were fabricated for comparison. The physical and chemical properties of four membranes, including chemical composition, morphology, contact angle, liquid entry pressure, thermodynamic analysis and gas permeability, were systemically characterized. Experiments of formaldehyde carbonylation under different reaction conditions were conducted. The results indicated that the yield of glycolic acid increased with decreasing pore size for porous membranes, which was due to the improvement of wetting behavior. The dense layer of PDMS in composite hollow fiber could effectively prevent the solvent from entering membrane pores, thus the membrane exhibited the best performance. At reaction temperature of 120℃ and operation pressure of 3.0 MPa, the yield of glycolic acid was always higher than 90% as the mass ratio of trioxane and phosphotungstic acid increased from 0.2:1 to 0.8:1. The highest turnover frequency was up to 26.37 mol·g^(-1)·h^(-1). This study provided a reference for the understanding and optimization of membrane contactors for the synthesis of glycolic acid using solvent with low surface tension.

关键词： PTFE hollow fiber Microstructure Membrane contactor Membrane wetting Carbonylation of formaldehyde

The control system for SSRF injection and extraction

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Nuclear Science and Techniques 2007年第6期18卷 326-329页

作者： YUAN Qibing GU Ming WANG Ruiping CHENG zhihao FAN Xuerong zhu Haijun Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 China

This paper introduces the injection and extraction control system design for SSRF,which is a distributed control system aimed at stability and reliability of the pulse power supplies,PPS(Personnel Protection System)and MPS(Machine Protection System).The hardware environment is mainly based on PLC(Programmable Logic Con- troller),and ARM(Advanced RISC Machine)is also applied for studying stability of the power *** and EPICS(Experimental Physics and Industrial Control System)have been selected as the platforms of SCADA(Super- visory Control and Data Acquisition).For unifying the interfacing to the control computer,all front-end equipments are connected via Industrial Ethemet.

关键词：控制系统 PPS MPS PLC

Defect-rich and highly porous carbon nanosheets derived from Ti_(3)AlC_(2) MAX with good lithium storage properties

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Chinese Chemical Letters 2023年第2期34卷 618-622页

作者： zhihao zhu Peng Liu Yucheng Liu Xingxing Gu Zhi Su Zhong Su Chao Lai College of Chemistry and Chemical Engineering Xinjiang Normal UniversityUrumqi 830054China School of Chemistry and Materials Science Jiangsu Normal UniversityXuzhou 221116China Chongqing Key Laboratory of Catalysis and New Environmental Materials College of Environment and ResourcesChongqing Technology and Business UniversityChongqing 400067China National Research Base of Intelligent Manufacturing Service Chongqing Technology and Business UniversityChongqing 400067China

Defect-rich,highly porous two-dimensional carbon nanosheets(CNS) have attracted tremendous research interests in catalysis and environmental purification and other fields,because of their unique micromorphology,chemical stability and high specific surface ***,in this work,we report a new solution to synthesize an ultrathin two-dimensional CNS with rich defects and abundant pores via two-step etching the Ti_(3)AlC_(2)with the help of I2and *** CNS thickness,specific surface area and pore volume could be all tunable by adding the amount of *** the highest specific surface area and pore volume of the synthesized 2D CNS can be achieved 1134.4 m^(2)/g and 0.80 cm^(3)/g,with a thickness of only 0.64 nm and a yield of 35.9%.When employed as the anodes for lithium-ion batteries,the synthesized CNS anodes exhibit good cycling and rate *** work provides a novel and facile strategy for synthesizing highly porous and defective 2D carbon materials with good lithium storage properties.

关键词： Ti_(3)AlC_(2) Two-dimensional Carbon nanosheets Rich defect High specific surface area

Performance Evaluation of a Permanent Magnet Electric-Drive- Reconfigured Onboard Charger with Active Power Factor Correction

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CES Transactions on Electrical Machines and Systems 2019年第1期3卷 72-80页

作者： Feng Yu zhihao zhu Jingfeng Mao Juping Gu the School of Electrical Engineering Nantong UniversityNantong 226019China

This paper presents a comprehensive charging operation for an electric-drive-reconfigured onboard charger(EDROC)with active power factor correction(APFC).The charging topology exclusively utilizes the three-phase permanent magnet synchronous motor(PMSM)propulsion system as a three-channel boost-type converter in which only a contactor and a small diode bridge are ***,the operation scenario of the EDROC is ***,the relationship between electromagnetic torque and rotor position is ***,the current ripple cancellation of the EDROC is discussed in ***,to implement the single-phase APFC along with charging voltage/current regulation of propulsion battery,control strategies including current balancing and synchronous/interleaving PWM strategies are ***,200W proof-of-concept prototype-based tests are conducted under different operation scenarios.

关键词： Active power factor correction current balancing electric-drive-reconfigured electromagnetic torque interleaving onboard charger.

Study on Simhydraulics Modeling and Controlling of New Active Hydro-pneumatic Inerter-based Suspension System

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Study on Simhydraulics Modeling and Controlling of New Activ...

Review of precipitation strengthening in ultrahigh-strength martensitic steel

2020中国汽车工程学会年会暨展览会

作者： Wang Ruochen zhu zhihao Yang Lin School of Automotive and Traffic Engineering Jiangsu University

To solve the problem of unsatisfactory performance of passive hydro-pneumatic inerter-based suspension with three components in series:conventional container,damper valve and accumulator,an active control method based on passive hydro-pneumatic inerter-based suspension is *** Simhydraulics modeling and experimental validation of the hydro-pneumatic inerter-based suspension,a quarter dynamic model of vehicle active hydro-pneumatic inerter-based suspension（AHPIS） was established and then LQG algorithm was used to adjust the opening of electro-hydraulic servo valve to control the output force of active hydro-pneumatic inerter-based *** co-simulation with Simhydraulics and Simulink shows that compared with traditional active hydro-pneumatic suspension（AHPS）,the body acceleration mean square root of the AHPIS is decreased by 18.55%,the tire dynamic load mean square root is decreased by 9.91% and the suspension working space mean square root is deteriorated by 8.91%.The performance of ride comfort and handle stability has been improved *** addition,the engineering application value of hydro-pneumatic inerterbased suspension with three components in series has been improved.

关键词： active hydro-pneumatic suspension inerter LQG control Simhydraulics/Simulink co-simulation

来源： cnki会议评论

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 256-269页

作者： zhihao Tian Chunlei Shang Chaolei Zhang Xiaoye Zhou Honghui Wu Shuize Wang Guilin Wu Junheng Gao Jiaming zhu Xinping Mao Institute for Carbon Neutrality University of Science and Technology BeijingBeijing 100083China Institute of Steel Sustainable Technology Liaoning Academy of MaterialsShenyang 110004China Department of Materials Science and Engineering Shenzhen MSU-BIT UniversityShenzhen 518172China Institute of Materials Intelligent Technology Liaoning Academy of MaterialsShenyang 110004China School of Civil Engineering Shandong UniversityJinan 250061China

Martensite is an important microstructure in ultrahigh-strength steels,and enhancing the strength of martensitic steels often involves the introduction of precipitated phases within the martensitic *** considerable research efforts devoted to this area,a systematic summary of these advancements is *** review focuses on the precipitates prevalent in ultrahigh-strength martensitic steel,primarily carbides(e.g.,MC,M_(2)C,and M_(3)C)and intermetallic compounds(e.g.,Ni Al,Ni_(3)X,and Fe_(2)Mo).The precipitation-strengthening effect of these precipitates on ultrahigh-strength martensitic steel is discussed from the aspects of heat treatment processes,microstructure of precipitate-strengthened martensite matrix,and mechanical ***,a perspective on the development of precipitation-strengthened martensitic steel is presented to contribute to the advancement of ultrahigh-strength martensitic *** review highlights significant findings,ongoing challenges,and opportunities in the development of ultrahigh-strength martensitic steel.

关键词： ultrahigh-strength martensitic steel precipitation strengthening mechanical property carbide intermetallic compound