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Self-Powered,Long-Durable,and Highly Selective Oil-Solid Triboelectric Nanogenerator for Energy Harvesting and Intelligent Monitoring

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Nano-Micro Letters 2022年第10期14卷 95-107页

作者： Jun Zhao Di Wang Fan Zhang Jinshan Pan Per Claesson Roland Larsson Yijun Shi Division of Machine Elements Department of Engineering Sciences and MathematicsLuleåUniversity of Technology97187 LuleåSweden Department of Engineering and Design School of Engineering and InformaticsUniversity of SussexBrighton BN19RHUK Division of Surface and Corrosion Science Department of ChemistryKTH Royal Institute of Technology10044 StockholmSweden

Triboelectric nanogenerators(TENGs)have potential to achieve energy harvesting and condition monitoring of oils,the“lifeblood”of ***,oil absorption on the solid surfaces is a great challenge for oil-solid TENG(O-TENG).Here,oleophobic/superamphiphobic O-TENGs are achieved via engineering of solid surface wetting *** designed O-TENG can generate an excellent electricity(with a charge density of 9.1μC m^(−2) and a power density of 1.23 mW m^(−2)),which is an order of magnitude higher than other O-TENGs made from polytetrafluoroethylene and *** also has a significant durability(30,000 cycles)and can power a digital thermometer for self-powered sensor ***,a superhigh-sensitivity O-TENG monitoring system is successfully developed for real-time detecting particle/water contaminants in *** O-TENG can detect particle contaminants at least down to 0.01 wt%and water contaminants down to 100 ppm,which are much better than previous online monitoring methods(particle>0.1 wt%;water>1000 ppm).More interesting,the developed O-TENG can also distinguish water from other contaminants,which means the developed O-TENG has a highly water-selective *** work provides an ideal strategy for enhancing the output and durability of TENGs for oil-solid contact and opens new intelligent pathways for oil-solid energy harvesting and oil condition monitoring.

关键词： Oil Triboelectric nanogenerator Energy harvesting Intelligent monitoring

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Diabolical ironclad beetle elytra-inspired flexible WE43 magnesium endovascular stent structures and their biomechanical potential

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Journal of Magnesium and Alloys 2025年第2期13卷 709-718页

作者： Il Won Suh Jinwoo Kim Sieb Chanchamnan Se Rim Jang Esensil Man Hia Chan Hee Park Cheol Sang Kim Division of Mechanical Design Engineering College of EngineeringJeonbuk National UniversityJeonjuJeonbuk 54896Republic of Korea Department of Bionanosystem Engineering Jeonbuk National UniversityJeonjuJeonbuk 54896Republic of Korea Department of Energy Storage Conversion Engineering of Graduate SchoolJeonbuk National UniversityJeonjuJeonbuk 54896Republic of Korea Department of Bionanotechnology and Bioconvergence Engineering Jeonbuk National UniversityJeonjuJeonbuk 54896Republic of Korea Eco-friendly Machine Parts Design Research Center Jeonbuk National UniversityJeonju 561756Republic of Korea Department of R&BD CMIT Co.Ltd.JeonjuJeonbuk-do 54920Republic of Korea

Nature-inspired designs have increasingly influenced biomedical engineering by providing superior biomechanical performance and structural *** this study,the diabolical ironclad beetle elytra structure was applied to stent strut designs and thoroughly evaluated through various computational simulations to assess their potential to enhance the mechanical performance of WE43 magnesium alloy *** elliptical structures with a vertical-to-horizontal length ratio of 1:1.8 were incorporated in varying numbers and then compared to conventional laser-cut stents using 3-point bending,crush,crimping,and expansion tests,internal carotid artery insertion simulations,and computational fluid dynamics *** results demonstrated that the biomimetic stents exhibited significantly improved stress distribution and reduced applied stress while maintaining hemodynamic *** fluid dynamics simulations further confirmed that the biomimetic could reduce wall shear stress and improve blood flow,thereby potentially minimizing the risk of restenosis and *** findings suggest that diabolical ironclad beetle-inspired stent structures may offer enhanced biomechanical performance and clinical safety in magnesium-based endovascular interventions.

关键词： Diabolical ironclad beetle WE43 magnesium alloy Endovascular interventions Biomechanical evaluation Computational fluid dynamics

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Biomechanical Test Setup for the Investigation of Forehead Suture Techniques

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Current Directions in Biomedical engineering 2023年第1期9卷 532-535页

作者： Micheler, Carina M. Lang, Jan J. Wilhelm, Nikolas J. Schaack, Victor G. Eisenhart-Rothe, Rüdiger Von Burgkart, Rainer H. H. Bäumlisberger, Anja Wachtel, Nikolaus Department of Orthopaedics and Sports Orthopaedics University Hospital Rechts der Isar School of Medicine Technical University of Munich Munich Germany Institute for Machine Tools and Industrial Management School of Engineering and Design Technical University of Munich Garching near Munich Germany Non-destructive Testing School of Engineering and Design Technical University of Munich Munich Germany Munich Institute of Robotics and Machine Intelligence Department of Electrical and Computer Engineering Technical University of Munich Munich Germany Division of Hand Plastic and Aesthetic Surgery University Hospital LMU Munich Munich Germany

Wound healing can be delayed if the biomechanical stability of the wound closure is inadequate. Therefore, it is necessary to investigate different suturing techniques for their biomechanical stability. In this study, suturing techniques suitable for the forehead area were investigated. For this application, a special test setup was developed to simulate the curvature of the forehead and the corresponding physiological configuration. The average forehead curvature is 62.24 ± 4.11 mm in radius. To simulate this curvature, the skin specimens are subjected to tensile stress over the spherical surface using a standard uniaxial testing machine. For the evaluation, an automated evaluation tool for MATLAB was also developed. Three different suturing techniques (Straight, Lazy-S, Zigzag) were investigated and tested for their biomechanical stability. Of the three suturing techniques, the Zigzag suture proved to be the most stable with the highest stiffness of 44.23 ± 8.18 % and the highest final failure of 32.60 ± 4.95 % (relative to the control sample without incision). The study has shown that the test setup can be used to investigate different forehead suture techniques. © 2023 the author(s), published by Walter de Gruyter Berlin/Boston.

关键词： MATLAB

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PROPOSITION OF A STRUCTURAL HEALTH MONITORING MODEL FOR A CONCEPT OF AN INNOVATIVE VARIABLE MASS PENDULAR TUNED MASS DAMPER

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Diagnostyka 2024年第2期25卷

作者： Radomski, Amadeusz Sierociński, Damian Jacek Chiliński, Bogumil Daniel Faculty of Automotive and Construction Machinery Engineering Warsaw University of Technology Poland Division of Computer Techniques Institute of Machine Design Fundamentals Faculty of Automotive and Construction Machinery Engineering Warsaw University of Technology Poland

The article focuses on the proposal of a model of a skyscraper equipped with a semi-active pendular vibration eliminator utilizing the phenomenon of fluid transfer, which could be used in monitoring the condition of slender structures. The proposed model consists of two main elements: an upper member, representing the dynamic mass of a skyscraper in the form of a trolley, and a lower member - a pendulum attached to the trolley. To consider the fluid transfer, a variable mass factor represented by an inverse tangent function was included in the equation of motion. Simulation studies in a dimensionless time domain were performed to investigate the influence of mass distribution on changes in the system’s response. Three dynamic states of the system were considered, during which the system’s total mass remained constant. Diagnostic parameters enabling the detection of changes in the mass of the eliminator and stiffness of a damped structure have been proposed. © 2024 by the Authors.

关键词： Tall buildings

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Biomechanical Test Setup for the Investigation of Forehead Suture Techniques

Biomechanical Test Setup for the Investigation of Forehead S...

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关键词： MATLAB

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Experimental analysis of chemical removal effect in RISA grinding of optical glass 7

Experimental analysis of chemical removal effect in RISA gri...

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7th CIRP Conference on Surface Integrity, CSI 2024

作者： Shimodo, Kodai Takamaru, Hinata Chiba, Yusuke Kato, Hidebumi Nagano, Mikinori Fukuta, Masahiko Tanaka, Katsutoshi Watanabe, Kentaro Hamazono, Kazuhisa Kakinuma, Yasuhiro Department of System Design Engineering Faculty of Science and Technology Keio University 3-14-1 Hiyoshi Kohoku-ku Yokohama223-8522 Japan Production Headquarters Nikon Corp. 1-10-1 Asamizo-dai Minami-ku Sagamihara252-0328 Japan Nano processing System Division Shibaura Machine C0. Ltd. 2068-3 Ohoka Numazu410-0022 Japan

In the large-aperture lens manufacturing, not only high surface quality but also high productivity is required. From this perspective, Reaction-Induced-Slurry-Assisted grinding (RISA grinding), in which cerium oxide slurry is supplied instead of using general grinding fluid, has been developed to achieve high surface quality at high removal rate. However, the surface profile error becomes large due to chemical removal effect of the cerium oxide slurry. Therefore, the purpose of this study is to experimentally investigate the influence of the chemical removal effect on the surface profile error using AE signals and servo current signals in RISA grinding. First, relation between dwell time and removal depth is analyzed by conducting a basic grinding test without the workpiece rotation. The result shows that the actual removal depth increases with increase of dwell time despite applying the constant depth of cut. Then, zero-cut RISA grinding test is conducted. It is found that the removal process proceeds even though zero-cut grinding, and its removal rate varies according to the wheel feed rate. Furthermore, the amount of cerium oxide abrasives adhered to the grinding wheel can be estimated from the AE signals and servo current signals. © 2024 The Authors. Published by Elsevier B.V.

关键词： Grinding (machining)

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Physics-Model-Regulated Deep Reinforcement Learning Towards Safety & Stability Guarantees

Physics-Model-Regulated Deep Reinforcement Learning Towards ...

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IEEE Conference on Decision and Control

作者： Hongpeng Cao Yanbing Mao Lui Sha Marco Caccamo Hongpeng Cao is with School of Engineering and Design Technical University of Munich Munich Germany Yanbing Mao is with Engineering Technology Division Wayne State University Detroit MI USA Department of Computer Science University of Illinois at Urbana-Champaign Urbana IL USA School of Engineering and Design and Institute of Robotics and Machine Intelligence Technical University of Munich Munich Germany

Deep reinforcement learning (DRL) has demonstrated impressive success in solving complex control tasks by synthesizing control policies from data. However, the safety and stability of applying DRL to safety-critical systems remain a primary concern and challenging problem. To address the problem, we propose the Phy-DRL: a novel physics-model-regulated deep reinforcement learning framework. The Phy-DRL is novel in two architectural designs: a physics-model-regulated reward and residual control, which integrates physics-model-based control and data-driven control. The concurrent designs enable the Phy-DRL the mathematically provable safety and stability guarantees. Finally, the effectiveness of the Phy-DRL is validated by an inverted pendulum system. Additionally, the experimental results demonstrate that the Phy-DRL features remarkably accelerated training and enlarged reward.

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Investigation on cutting fluid use in finish milling of polylactide (PLA) 3D-printed parts 20

Investigation on cutting fluid use in finish milling of poly...

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20th CIRP Conference on Modeling of Machining Operations in Mons, CIRP CMMO 2025

作者： Lorenzoni, Margaux Spitaels, Laurent Rivière-Lorphèvre, Edouard Odent, Jérémy M'Saoubi, Rachid Cloëz, Liam Fontaine, Michaël Ducobu, François Machine Design and Production Engineering Lab Research Institute for Materials Science and Engineering University of Mons Place du Parc 20 Mons7000 Belgium University of Mons Place du Parc 20 Mons7000 Belgium R&D Material and Technology Development Seco Tools AB Björnbacksvägen 2 FagerstaSE-737 82 Sweden Department of Mechanical Engineering Sciences Division of Production and Materials Engineering Lund University Ole Römers väg 1 LundSE-221 00 Sweden FEMTO-ST Institute-Applied Mechanics Dept. Université de Franche-Comté-SUPMICROTECH-CNRS Rue de l'épitaphe 24 BesançonF-25000 France

Fused Filament Fabrication (FFF) is an additive manufacturing process based on Material Extrusion (MEX) of polymeric filament. This manufacturing technology is commonly used for personalized production applications and prototyping, allowing to obtain customized parts with complex geometries at a low cost. However, this production technique has its limitations regarding dimensional accuracy and surface roughness of the final parts. To overcome these limitations, finish milling is considered to be a promising technique as it is widely used for metallic parts. Yet, the specific thermal properties of polymers such as low thermal conductivity and low melting temperature are adding a challenge in the determination of optimal cutting conditions. In this context, the use of cutting fluid could be the key to keep the material from melting during milling. Therefore, this paper proposes to compare the impact of using a compressed air flow to dry conditions on the cutting forces and the surface quality obtained on 3D-printed polylactide (PLA) parts. The qualification test of the tool-material couple standard (NF E 66-520-6) will be used as a guideline to determine the relevance of cutting fluid use for cutting conditions varying around an operating point. Moreover, simulated cutting forces using a mechanistic model will be compared to experimental data to evaluate the applicability of the model. © 2025 The Authors.

关键词： Compressed air

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Heterostructure Zinc Oxide Nanosheets Decorated Polyaniline-Coated Polyurethane/Chitosan Hybrid Nanofiber-Based Flexible Sensor for Electrochemical Glucose Sensing

SSRN

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SSRN 2023年

作者： Shrestha, Devendra Tulsi, Nayaju Bikendra, Maharjan Kyoung-In, Kang Bacirhonde, Patrick M. Shrestha, Bishnu Kumar Park, Chan Hee Sang, Kim Cheol Department of Bionanotechnology and Bioconvergence Engineering Graduate School Jeonbuk National University Jeonju561-756 Korea Republic of Department of Bionanosystem Engineering Graduate School Jeonbuk National University Jeonju561-756 Korea Republic of Division of Mechanical Design Engineering Jeonbuk National University Jeonju561-756 Korea Republic of Eco-Friendly Machine Parts Design Research Center Jeonbuk National University Jeonju Korea Republic of

Current technological advances in the development of glucose sensors have made it easier to diagnose glucose levels. designing and fabrication of cost-effective, sensitive, and portable glucose sensors with high accuracy have been increasing with great prospects in clinical applications. Herein, a nanofiber-based flexible sensor assessable of glucose stimuli with sufficient liquid permeability was constructed. Anchoring the zinc oxide (ZnO) nanosheet over polyaniline (PA) coated polyurethane-chitosan (PU-Chitosan;PUC) fibrous mat followed by glucose oxidase (GOx) immobilization constructed a mechanically robust, highly electroactive, flexible (PUC-PA-ZnO@GOx) glucose sensing device. The synergy of conductivity of PA, the large active surface of ZnO, and redox GOx protein triggered the electrocatalytic performance of PUC-PA-ZnO@GOx sensor. The sensor exhibited excellent catalytic properties with a wide concentration range (0.1 - 11 mM) of detection limit which could be clinically relevant to monitoring glucose. The sensor showed high sensitivity (~ 99.62 µA mM-1 cm-2) and low detection limit (~ 7.59 µM) with acceptable stability, and reproducibility which are worthy for the measurement of glucose levels in the biological system. Thus, a sustainable and eco-friendly approach demonstrated the new technique to design glucose sensors with the next generation of high-performance wearable and implantable glucose sensors to measure the glucose level in real-time. © 2023, The Authors. All rights reserved.

关键词： Glucose sensors

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Experimental analysis of chemical removal effect in RISA grinding of optical glass

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Procedia CIRP 2024年 123卷 304-309页

作者： Kodai Shimodo Hinata Takamaru Yusuke Chiba Hidebumi Kato Mikinori Nagano Masahiko Fukuta Katsutoshi Tanaka Kentaro Watanabe Kazuhisa Hamazono Yasuhiro Kakinuma Department of System Design Engineering Faculty of Science and Technology Keio University 3-14-1 Hiyoshi Kohoku-ku Yokohama 223-8522 Japan Production Headquarters Nikon Corp. 1-10-1 Asamizo-dai Minami-ku Sagamihara 252-0328 Japan Nano processing System Division Shibaura Machine Co. Ltd. 2068-3 Ohoka Numazu 410-0022 Japan

关键词： Ultra-precision grinding Chemical mechanical grinding Optical lens

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