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Proposal of a novel peeling of nano-particle (PNP) process for localized material removal on a hard material surface by controllable magnetic fields 22

Proposal of a novel peeling of nano-particle (PNP) process f...

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22nd International Conference of the European Society for Precision engineering and Nanotechnology, EUSPEN 2022

作者： Permpatdechakul, Thitipat Khajornrungruang, Panart Suzuki, Keisuke Kutomi, Shotaro Graduate School of Computer Science and System Engineering Mechanical Information Science and Technology Course Kyushu Institute of Technology Fukuoka Japan Department of Intelligent and Control Systems Avanced Mechanical Division Kyushu Institute of Technology Fukuoka Japan School of Computer Science and System Engineering Advanced Mechanical Course Kyushu Institute of Technology Fukuoka Japan

ISBN: (纸本)9781998999118

This article proposes a novel Peeling of Nano-Particle (PNP) process to locally remove material on a hard material surface using controllable magnetic fields. Fe3O4 particles in the size range of 50-100 nm in aqueous solution (pH value 11 adjusted by KOH) were magnetically controlled to adhere and remove from a 4H-SiC surface by two electromagnetic coils, which were sandwiched between the substrate. The particle controlling phenomenon on the surface was experimentally observed and verified by our developed apparatus applying an evanescent field. According to the results, particles could be controlled to approach and remove from the substrate surface with 12mT of magnetic field at the selective area on the substrate surface to realise the proposed PNP process. © European Society for Precision engineering and Nanotechnology, Conference Proceedings - 22nd International Conference and Exhibition, EUSPEN 2022. All rights reserved.

关键词： Magnetic fields

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Absolute longitudinal distance measurement verification of a standard polystyrene nanoparticle near a surface in water by means of multi-wavelength evanescent field 22

Absolute longitudinal distance measurement verification of a...

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22nd International Conference of the European Society for Precision engineering and Nanotechnology, EUSPEN 2022

作者： Blattler, Aran Khajornrungruang, Panart Suzuki, Keisuke Baba, Akiyoshi Goto, Daiki Graduate School of Computer Science and System Engineering Mechanical Information Science and Technology Course Kyushu Institute of Technology Fukuoka Japan Department of Intelligent and Control Systems Advanced Mechanical Division Kyushu Institute of Technology Fukuoka Japan Center of Microelectronic System Kyushu Institute of Technology Fukuoka Japan School of Computer Science and System Engineering Advanced Mechanical Course Kyushu Institute of Technology Fukuoka Japan

ISBN: (纸本)9781998999118

In the wet semiconductor process, abrasive nanoparticles are widely used in the chemical mechanical polishing (CMP) process to polish wafer surfaces for high planarization. During polishing, nanoparticles move with a high-speed three-dimensional (3D) position in the solution. In the 3D particles's moving positions, Z is a perpendicular longitudinal distance between the surface to the nanoparticle that plays a significant role in polishing, which could not be measured by general microscopy without longitudinal scanning. To understand nanoparticle phenomena near-surface, we have proposed and developed the apparatus with real-time fastmotion tracking on optical multi-wavelength evanescent fields microscopy to measure the 3D motion of the nanoparticle in water without scanning. In euspen's 2020, we could verify the relative distance ?Z of nanoparticles in water, but the absolute distance Z is unknown yet. In this manuscript, we have therefore developed an invisible nano-step height in water to verify the absolute height Z of an individual nanoparticle. The invisible nano-step height in water is made from an optical resin with a refractive index of 1.35 that is close to a refractive index of water to avoid unnecessary light during experimental verification. The nano-step height was less than 100 nm on a glass surface, fabricated using nanoimprint lithography. Polystyrene f100 nm standard particles in water were used to verify the height Z. The results of height Z of nanoparticles could be measured less than 100 nm with the measurement uncertainty ±10 nm (2s), which is related to the interferometer result of the nano-step height. © European Society for Precision engineering and Nanotechnology, Conference Proceedings - 22nd International Conference and Exhibition, EUSPEN 2022. All rights reserved.

关键词： Nanoparticles

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Research on Metamaterial Technology for Microwave Wireless Power Transfer

Research on Metamaterial Technology for Microwave Wireless P...

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2024 International Symposium on Antennas and Propagation, ISAP 2024

作者： Yamamoto, Tsunayuki Kobashi, Takeo Maruyama, Tamami Department of Integrated Science and Technology National Institute of Technology Tsuyama College Tsuyama-shi Japan Advanced Electronics and Information System Engineering Course National Institute of Technology Tsuyama College Tsuyama-shi Japan Department of Production Systems Engineering Institute of Technology Hakodate College Hakodate-shi Japan

ISBN: (纸本)9798350364774

In this paper, two technologies of metamaterial for microwave wireless power transfer are shown. One is a zeroth-order resonance for a microwave snow melting system, and another one is a focusing reflector for realizing of a highly efficient wireless power transfer space. A zeroth-order resonance leads a uniformed microwave heating and a flexibility of feeding in a snow melting system. Focusing reflector can make some electromagnetic hot and null points in a space. These are expected to be required technologies for highly efficient wireless power transfer. © 2024 IEEE.

关键词： Reflection

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Numerical Simulation of Flow Field around NACA 0012 Airfoil at Low Reynold’s Number Assuming Mars Environment using OpenFoam

Numerical Simulation of Flow Field around NACA 0012 Airfoil ...

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AIAA science and Technology Forum and Exposition, AIAA SciTech Forum 2025

作者： Okamoto, Atsushi Yamada, Takafumi Advanced Mechanical and Control System Engineering Course National Institute of Technology Tsuyama College 624-1 Okayama Numa Tsuyama708-8509 Japan Associate Professor Department of Integrated Science and Technology National Institute of Technology Tsuyama College 624-1 Okayama Numa Tsuyama708-8509 Japan

ISBN: (数字)9781624107238

ISBN: (纸本)9781624107238

In this study, incompressible flow fields around a NACA0012 airfoil were numerically simulated at low Reynolds number for a Mars environment. For mesh generation, the standard Open FOAM utilities block Mesh and snappy HexMesh were used. Using those meshes and pisoFoam, which is PISO method-based analysis solver, NASA wind tunnel test conditions were numerically simulated in the Earth environment and obtained a similar lift gradient as in the experiment up to the stall. Then, the flow field of 12,000 Reynolds number, which simulates the Martian environment, was calculated. The variation of lift coefficient with increasing angle of attack was almost consistent with the experimental value in the Earth environment, and the stall angle was 16°. From the results of pressure distribution on the wing surface, it is suggested that compared to the Earth environment, the separation point movesfrom the leading edge to aft of the wing upper surface in the Martian environment. The flow field at the stall angle was similar to that of the Earth environment, and vortices were formed, however, their velocity vectors were very small, and dead water regions were observed near the trailing edge of the wing upper surface. More detailed aerodynamic characteristics should be clarified by evaluating the results using drag and moment coefficients until the SciTech Forum 2025. © 2025, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： NASA

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Optical Evanescent Field for Direct Observation of Sub-100nm Particle Motion on Glass Surface 1

Optical Evanescent Field for Direct Observation of Sub-100nm...

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1st International Conference on Robotics, engineering, science, and Technology, RESTCON 2024

作者： Khajornrungruang, Panart Permpatdechakul, Thitipat Suzuki, Keisuke Blattler, Aran Terayama, Yutaka Goto, Daiki Phaisalpanumas, Pipat Bun-Athuek, Natthaphon Phunopas, Amornphun Kyushu Institute of Technology Iizuka-Shi Mechanical Science and Technology Division Dept. of Intelligent and Control System Faculty of Computer Science and Systems Engineering Fukuoka Japan Kyushu Institute of Technology Iizuka-Shi Mechanical Information Science and Technology Division Dept. of Interdisciplinary Informatics Graduate School of Computer Science and Systems Engineering Fukuoka Japan King Mongkut's University of Technology North Bangkok Bangsue Faculty of Engineering Dept. of Production and Robotics Engineering Bangkok Thailand Kyushu Institute of Technology Iizuka-Shi Mechanical Science and Technology Course Dept. of Intelligent and Control System Graduate School of Computer Science and Systems Engineering Fukuoka Japan King Mongkut's University of Technology North Bangkok Bangsue Faculty of Engineering Dept. of Industiral Engineering Bangkok Thailand King Mongkut's University of Technology North Bangkok Bangsue College of Industrial Technology Dept. of Mechanical Engineering Technology Bangkok Thailand

ISBN: (纸本)9798350348842

To directly investigate the dynamic nanoscale phenomenon on the surface being processed in wet conditions such as precision polishing, and cleaning in semiconductor industrial, an optical method for visualization and observation of each sub-100 nm sized particle that is moving on an interface such as a silica glass surface by applying an evanescent field have been proposing. Subsequently, we developed an experimental apparatus equipped with an optical microscopy system for verifying the moving particle observation method in a laboratory scale. This article introduces some experimentally direct observation results of duplicated wet processes. © 2024 IEEE.

关键词： Visualization

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Automatic drawing of complex metro maps

Automatic drawing of complex metro maps

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作者： Onda, Masahiro Moriguchi, Masaki Imai, Keiko Information and System Engineering Course Graduate School of Science and Engineering Chuo University Tokyo112-8551 Japan Department of Information and System Engineering Faculty of Science and Engineering Chuo University Tokyo112-8551 Japan NTT Communications Corporation

The Tokyo subway is one of the most complex subway networks in the world and it is difficult to compute a visually readable metro map using existing layout methods. In this paper, we present a new method that can generate complex metro maps such as the Tokyo subway network. Our method consists of two phases. The first phase generates rough metro maps. It decomposes the metro networks into smaller subgraphs and partially generates rough metro maps. In the second phase, we use a local search technique to improve the aesthetic quality of the rough metro maps. The experimental results including the Tokyo metro map are shown. Copyright © 2021 The Institute of Electronics, Information and Communication Engineers

关键词： Subways

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A 4D printed self-assembling PEGDA microscaffold fabricated by digital light processing for arthroscopic articular cartilage tissue engineering

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Progress in Additive Manufacturing 2024年第1期9卷 3-14页

作者： Hao, Yunjie Wu, Chuanyung Su, Yuchuan Curran, Jude Henstock, James R. Tseng, Fangang Department of Engineering and System Science National Tsing Hua University Hsinchu 30013 Taiwan Department of Engineering and System Science Frontier Research Centre On Fundamental and Applied Sciences of Matters National Tsing Hua University Hsinchu 30013 Taiwan Research Centre for Applied Sciences Academia Sinica No. 128 Sec. 2 Academia Rd. Taipei Nankang 11529 Taiwan Department of Mechanical Materials and Aerospace School of Engineering Harrison Hughes Building University of Liverpool Liverpool L69 3GH United Kingdom Institute of Life Course & Medical Sciences William Henry Duncan Building University of Liverpool Liverpool L7 8TX United Kingdom

Articular cartilage in synovial joints such as the knee has limited capability to regenerate independently, and most clinical options for focal cartilage repair merely delay total joint replacement. Tissue engineering presents a repair strategy in which an injectable cell-laden scaffold material is used to reconstruct the joint in situ through mechanical stabilisation and cell-mediated regeneration. In this study, we designed and 3D-printed millimetre-scale micro-patterned PEGDA biomaterial microscaffolds which self-assemble through tessellation at a scale relevant for applications in osteochondral cartilage reconstruction. Using simulated chondral lesions in an in vitro model, a series of scaffold designs and viscous delivery solutions were assessed. Hexagonal microscaffolds (750 μm x 300 μm) demonstrated the best coverage of a model cartilage lesion (at 73.3%) when injected with a 1% methyl cellulose solution. When chondrocytes were introduced to the biomaterial via a collagen hydrogel, they successfully engrafted with the printed microscaffolds and survived for at least 14 days in vitro, showing the feasibility of reconstructing stratified cartilaginous tissue using this strategy. Our study demonstrates a promising application of this 4D-printed injectable technique for future clinical applications in osteochondral tissue engineering. © 2022, The Author(s).

关键词： Articular cartilage DLP-3D printing PEGDA hydrogel Self-assembly scaffold Tissue engineering

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EVALUATION ON JOINING BEHAVIOR OF UD-CF/EPOXY LAMINATES AND ALUMINUM PLATE USING ULTRASONIC HEATING 23

EVALUATION ON JOINING BEHAVIOR OF UD-CF/EPOXY LAMINATES AND ...

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23rd International Conference on Composite Materials, ICCM 2023

作者： Urano, A. Tanabe, D. Nishiyabu, K. Advanced Course of Mechanical System Engineering Kobe City College of Technology 8-3 Gakuen-Higashimachi Nishi-ku Kobe651-2194 Japan Department of Mechanical Engineering Kobe City College of Technology 8-3 Gakuen-Higashimachi Nishi-ku Kobe651-2194 Japan Faculty of Science and Engineering Kindai University 3-4-1 Kowakae Higashiosaka city Osaka577-8502 Japan

This study aims to reveal the ultrasonic joining behavior and joining strength of aluminium and carbon fiber reinforced plastics (CFRP) by using ultrasonic heating. The material used for experiment was unidirectional carbon fiber reinforced epoxy (UD-CF/Epoxy) laminates and aluminium (Al) plate. In order to improve the tensile shear strength of joining part, polishing and surface-modified phenoxy polymer coating were performed on the joining surface of the Al plates and UD-CF/Epoxy laminates. In this study, UD-CF/Epoxy laminates and Al plates were bonded by the ultrasonic welding method using phenoxy polymer sheet as energy director. The effects of processing conditions such as oscillation time, pressing force and surface treatment methods were investigated to improve the tensile shear strength. In this study, the various processing condition was investigated to improve the tensile shear strength. The contents for evaluation were single lap tensile share strength, cross-sectional and fracture surface observation. From the experimental results, it was found that the joining strength was depended on the difference in the surface treatment of joining surface. © 2023 International Committee on Composite Materials. All rights reserved.

关键词： Surface treatment

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An attention mechanism extension of automatic HTML generation from web page design images

IEEJ Transactions on Electronics, Information and Systems

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IEEJ Transactions on Electronics, Information and systems 2020年第12期140卷 1393-1401页

作者： Chinen, Hiroki Ohki, Hidehiro Gyohten, Keiji Takami, Toshiya Computer Science and Intelligent System Course Graduate School of Engineering Oita University 700 Dannoharu Oita870-1192 Japan

The purpose of this study is to improve the accuracy of automatic HTML generation from web page design images. pix2code is the state of art in this field. It is consist of design image learning part by CNN and HTML learning part by LSTM. We propose three improvements of adding a word embedding layer, applying VGG16 fine tuning to CNN, replacing LSTM to Bidirectional LSTM or GRU, and introducing attention mechanism. In the experiment, we employed a conventional data set which was used in pix2code and evaluated by a standard natural language generation metric called BLEU. As the results, the one of proposed models that contained the word embedding layer and the attention mechanism scored the accuracy of 99%. It overcomes the result of state of art scored 88%. © 2020 The Institute of Electrical Engineers of Japan.

关键词： HTML

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Robot Visual Place Recognition Method Based on Scan-Descriptors and Optimization Algorithms

Research Square

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Research Square 2024年

作者： Liu, Yu Ye, Minying Zhao, Jinwei Jin, Yongze Shangguan, Anqi Liang, Jonathan Tay Yu School of computer science and engineering Xi' an University of Technology Shannxi Xi’an710048 China Human and Artificial Intelligent System Course Graduate School of Engineering The University of Fukui Fukui910-8507 Japan School of Automation and Information Engineering Xi' an University of Technology Shannxi Xi’an710048 China

Visual place recognition using 3D lidar in robotics is a popular research topic. Feature representation descriptors, such as scan-context descriptors, which are 2D descriptors obtained from 3D point clouds, are one of the research directions with great in-depth research value. This paper proposes a new method to improve the robot visual place recognition method based on scan-context descriptors. Our approach focuses on using a combination of loss functions and optimizers to improve the accuracy and robustness of the recognition system. Specifically, we introduce a custom loss function that encourages the network to learn more discriminative features and a Heun optimizer that enables faster and more stable convergence during training. To evaluate the effectiveness of our method, we conduct experiments on the NCLT benchmark dataset. The results show that our method outperforms some existing methods in terms of recognition accuracy and computational efficiency. Our proposed method provides a promising solution for improving robot place recognition, which has significant implications for a wide range of robotic applications, including autonomous navigation, mapping, and localization. © 2024, CC BY.

关键词： Robots

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