Yan, Jiwang



Faculty of Science and Technology, Department of Mechanical Engineering (Yagami)



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Profile Summary 【 Display / hide

  • To create new products with high added value, we are conducting R&D on high-accuracy, high-efficiency, resource-saving manufacturing technologies through micro/nanometer-scale material removal, deformation, and property control. Our recent research focuses on ultra-precision mechanical fabrication, micro-nano forming/imprinting, micro electrical machining, laser machining, laser recovery, and laser Raman spectroscopy.

Career 【 Display / hide

  • 2000.04

    Research Associate, Tohoku University, Graduate School of Engineering

  • 2001.10

    Associate Professor, Kitami Institute of Technology

  • 2005.04

    Associate Professor, Tohoku University, Graduate School of Engineering

  • 2007.04

    Associate Professor, Tohoku University, Graduate School of Engineering

  • 2008.02

    Sydney University, Japan-Australia Exchange Researcher

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Academic Background 【 Display / hide

  • 1991.07

    Jilin University, Faculty of Engineering, Department of Mechanical Engineering

    University, Graduated

  • 1994.03

    Jilin University, Graduate School, Division of Engineering, Department of Mechanical Engineering

    Graduate School, Completed, Master's course

  • 1996.01

    Tsinghua University, Graduate School, Division of Engineering, Department of Precision Instruments and Mechanology

    Graduate School, Withdrawal before completion, Doctoral course

  • 2000.03

    Tohoku University, Graduate School, Division of Engineering, Department of Mechatronics and Precision Engineering

    Graduate School, Completed, Doctoral course

Academic Degrees 【 Display / hide

  • Ph.D., Tohoku University, Coursework, 2000.03


Research Areas 【 Display / hide

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Manufacturing and production engineering (Precision Engineering/Mechanical manufacturing)

  • Nanotechnology/Materials / Material processing and microstructure control (Material Processing/Treatment)

  • Nanotechnology/Materials / Nano/micro-systems (Micro/Nanodevice)

  • Nanotechnology/Materials / Composite materials and interfaces (Applied Physical Properties/Crystal Engineering)

Research Keywords 【 Display / hide

  • Ultraprecision machining

  • Micro/nano manufacturing

  • Laser processing

  • Electrical discharge machining

  • Nanomechanics


Books 【 Display / hide

  • Multidisciplinary Science in Micro/Nanoscale Manufacturing

    J. Yan (Guest editor), Elsevier B.V., 2020.12

    Scope: International Journal of Machine Tools and Manufacture, Volume 159 (Special Issue)

  • Micro and Nanoscale Laser Processing of Hard Brittle Materials

    J. Yan and N. Takayama, Elsevier B.V., 2019.11,  Page: 242

    Scope: 1-242

  • Recent Developments of Silicon Anodes for Lithium Ion Batteries

    J. Yan, CMC Publishing CO., LTD. , 2019.11,  Page: 251

    Scope: Chapter 3: Micro Pillar Generation by Laser Irradiation on Waste Silicon Powder and Its Electrode Characteristics, 20-33

  • Micro and Nano Fabrication Technology

    J. Yan (ed.), Springer Nature Singapore Pte Ltd., 2018.05

    Scope: 1-959

  • Micro and Nano Fabrication Technology, J. Yan (ed.)

    M. Mukaida, J. Yan, Springer Nature Singapore Pte Ltd., 2018.05

    Scope: Chapter 7: Tool-Servo Driven Diamond Turning for Structured Surface, 215-244

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Papers 【 Display / hide

  • Microstructures and mechanical properties of Zr-based metallic glass ablated by nanosecond pulsed laser in various gas atmospheres

    Y Qian, M Jiang, Z Zhang, H Huang, J Hong, J Yan

    Journal of Alloys and Compounds, 163717 (Journal of Alloys and Compounds)  901 2022.04

    ISSN  09258388

     View Summary

    The surface with micro-convex prepared by laser ablation is beneficial to improving the functional properties of metallic glasses (MGs). However, accompanied by the formation of micro-convex, surface hardness of the ablated area generally decreases due to the softening effect caused by laser thermal shock. Previous studies have shown that the mechanical properties of laser-ablated MG surface are significantly different when using different gas atmospheres. In this study, a comparative investigation was performed to analyze the influence of gas atmosphere (i.e. argon, nitrogen, and air) on the formation of micro-convex as well as its surface characteristics and mechanical properties. Experimental results showed that the atmosphere type did not affect the formation of micro-convex, but significantly affected the surface morphology and element composition of the laser-ablated area. The element analysis and Raman spectral measurements indicated that laser ablation in nitrogen or air atmosphere resulted in local nitridation or oxidation. The results of nanoindentation tests demonstrated that laser ablation in nitrogen or air atmosphere also resulted in surface hardness inhomogeneity, i.e., softening and hardening effects coexist in the ablated area, which could be attributed to the combined influence of laser thermal shock, the introduction of secondary phase as well as laser ablation induced loose structure.

  • Flexible fabrication of fresnel micro-lens array by off-spindle-axis diamond turning and precision glass molding

    L Zhang, YY Allen, J Yan

    Precision Engineering (Elsevier {BV})  74   186 - 194 2022.03

    Research paper (scientific journal), Joint Work, Accepted,  ISSN  01416359

     View Summary

    Fresnel micro-lens arrays with close-to-wavelength features have significant advantages in minimization of optical systems. However, in the fabrication of a Fresnel micro-lens array by conventional diamond turning, the discontinuous features of the surface profile cause interference between the tool flank face and the finished surface. In this manuscript, a novel off-spindle-axis diamond turning method is proposed to fabricate Fresnel micro-lens array mold insert and a toolpath generation algorithm is developed. The generation of each lenslet is treated as an independent turning operation, and the whole fabrication of a Fresnel micro-lens array is completed by a succession of repetitive turning operations. With this approach, the interference between the tool and the finished surface is avoided, and the form accuracy and surface integrity are improved for each lenslet. Then, the Fresnel micro-lens array mold insert is further utilized in precision glass molding to replicate the micro-lens structures onto transparent polymer substrates. The experimental results indicate that both the diamond-turned and molded Fresnel micro-lens arrays are achieved with homogeneous quality. As an application, a compact imaging system based on the molded Fresnel micro-lens array is demonstrated. The proposed machining method in this study can be employed in the fabrication of Fresnel micro-lens arrays and other micro-optics with discontinuous profiles with high accuracy and machining efficiency.

  • Development of High-Sensitivity Electrically Conductive Composite Elements by Press Molding of Polymer and Carbon Nanofibers

    S Aikawa, Y Zhao, J Yan

    Micromachines 13 (2), 170 ({MDPI} {AG})  13 ( 2 ) 170 2022.01

    Research paper (scientific journal), Joint Work, Accepted

     View Summary

    Carbon nanofibers (CNFs) have various excellent properties, such as high tensile strength, electric conductivity and current density resistance, and thus have great application potential in electrical sensor development. In this research, electrically conductive composite elements using CNFs sandwiched by thermoplastic olefin (TPO) substrates were developed by press molding. The metal mold used for press molding was processed by a femtosecond laser to generate laser-induced periodic surface structures (LIPSS) on the mold surface. The aggregate of CNFs was then flexibly fixed by the LIPSSs imprinted on the TPO substrate surface to produce a wavy conductive path of CNFs. The developed composite elements exhibited a sharp increase in electrical resistance as strain increased. A high gauge factor of over 47 was achieved, which demonstrates high sensitivity against strain when the composite element is used as a strain gauge. Scanning electron microscope observation revealed that the TPO filled the spaces in the aggregate of CNFs after press molding, and the conductive path was extended by the tensile strain. The strain-induced dynamic changes of contact states of CNFs and CNFs networks are discussed based on the electrical performance measurement and cross-sectional observation of the elements. This research provides a new approach to the production of flexible and high sensitivity strain sensors.

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Reviews, Commentaries, etc. 【 Display / hide

  • EDM/Grinding Hybrid Machining of Single-crystal SiC using Poly-crystal Diamond Tools

    J. Yan

    Journal of the Japan Society for Abrasive Technology 65 ( 12 ) 650 - 653 2021.12

    Article, review, commentary, editorial, etc. (scientific journal), Single Work

  • EDM/ECM hybrid machining for generating microgrooves

    R. Kishi, J. Yan

    Electrical Machining Technology 45 ( 140 ) 1 - 6 2021.06

    Article, review, commentary, editorial, etc. (scientific journal), Joint Work

  • Effects of ultrasonic vibration on groove grinding of CFRP

    T. Yamazaki, J. Yan

    Ultrasonic Technology 32 ( 6 ) 1 - 6 2020.12

    Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media), Joint Work

  • Surface quality improvement of additive-manufactured metal parts by ultrasonic vibration-assisted burnishing

    A. Teramachi, J. Yan

    Ultrasonic Technology 32 ( 6 ) 7 - 11 2020.12

    Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media), Joint Work

  • Laser-Induced Periodic Surface Structure on Steel and Its Application to Mold Fabrication

    J. Yan

    Journal of the Japan Society for Abrasive Technology 64 ( 8 ) 399 - 402 2020.08

    Article, review, commentary, editorial, etc. (scientific journal), Single Work

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Presentations 【 Display / hide

  • Implementation of the Mathematical Model for Service Robot to Avoid Obstacles and Human

    Ngo H.Q.T., Tran A.S., Dong V.K., Yan J.

    6th Future Technologies Conference (FTC 2021) Online, 


    Oral presentation (general), Lecture Notes in Networks and Systems

  • 微細構造表面の超精密加工と機能付与

    閻 紀旺

    精密工学会第410回講習会「超精密 加工/計測技術 -光学部品の高精度要求に応える先端事例と最新動向」 (東京(オンライン開催)) , 


    Oral presentation (invited, special)

  • マイクロ加工技術の進展と研究動向

    閻 紀旺

    精密工学会マイクロ生産機械システム専門委員会2020年度総会兼第59回委員会 (東京(オンライン開催)) , 


    Oral presentation (invited, special)

  • Laser healing of machining-induced microcracks in single-crystal sapphire

    K. Adachi, Y. Nishide, N. Sugizaki, J. Yan

    The 18thInternational Conference on Precision Engineering (ICPE2020) (Kobe, Japan (Online)) , 


    Oral presentation (general)

  • Response of resin coating films containing fine metal particles to ultrashort laser pulses

    A. Nakajima, J. Yan

    The International Symposium on Precision Engineering and Sustainable Manufacturing (PRESM2020) (Seoul, Korea (Online)) , 


    Poster presentation

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Awards 【 Display / hide

  • Machine Tool Technology Promotion Award

    S. Kasai, T. Sodetai, J. Yan, 2021.06, 工作機械技術振興財団, 炭素拡散反応を用いた形彫り放電加工による多結晶ダイヤモンドの3次元形状創製

    Type of Award: Award from publisher, newspaper, foundation, etc.

  • Machine Tool Technology Promotion Award

    K. Nagayama, J. Yan, 2021.06, 工作機械技術振興財団, Measurement and Compensation of Tool Contour Error Using White Light Interferometry for Ultra-Precision Diamond Turning of Freeform Surfaces

    Type of Award: Award from publisher, newspaper, foundation, etc.

  • JSME Medal for Outstanding Paper

    T. Terabayashi, J. Yan, 2021.04, The Japan Society of Mechanical Engineers, Ultra-precision cutting of roll molds having two-directional wavy microstructures

    Type of Award: Award from Japanese society, conference, symposium, etc.

  • PRESM2020 Best Paper Award

    A. Nakajima, J. Yan, 2020.10, International Symposium on Precision Engineering and Sustainable Manufacturing (PRESM2020), Response of Resin Coating Films Containing Fine Metal Particles to Ultrashort Laser Pulses

    Type of Award: Award from international society, conference, symposium, etc.,  Country: Korea, Republic of

  • Outstanding Paper Award

    Z. Zhang, J. Yan, T. Kuriyagawa, 2020.09, International Journal of Extreme Manufacturing (IJEM), IoP publishing, Manufacturing technologies toward extreme precision

    Type of Award: Honored in official journal of a scientific society, scientific journal

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Courses Taught 【 Display / hide











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Memberships in Academic Societies 【 Display / hide

  • The Japan Society of Mechanical Engineers, 

  • The Japan Society for Precision Engineering, 

  • The Japan Society for Abrasive Technology, 

  • Japan Society for Applied Physics (JSAP), 

  • Japan Laser Processing Society (JLPS), 


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Committee Experiences 【 Display / hide

  • 2022.05

    Director, Japan Society of Laser Technology (JSLT)

  • 2022.03

    Director, Executive Director, Chairman of Publication Sector, Chairman of Journal Review Board, Japan Society of Precision Engineering (JSPE)

  • 2019.04

    Journal Editorial Commitee Member, 日本機械学会

  • 2019.01

    Editorial Board Member, International Journal of Extreme Manufacturing

  • 2018.04

    Editorial Board Member, Journal of Micromanufacturing

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