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2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Chen, Zhihan Ding, Hongru Zheng, Yuebing Materials Science & Engineering Program Texas Materials Institute The University of Texas at Austin AustinTX78712 United States Walker Department of Mechanical Engineering The University of Texas at Austin AustinTX78712 United States

We have developed an optical feedback control system with synchronous control of active particles to study collective motion in nature. Fish-like vortex is observed within a circular confined geometry based on the par... 详细信息

ISBN: (纸本)9781957171258

关键词： Adaptive control systems

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Atomic coordination dictates vibrational characteristics and thermal conductivity in amorphous carbon

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npj Computational materials 2022年第1期8卷 525-531页

作者： Ashutosh Giri Connor J.Dionne Patrick E.Hopkins Department of Mechanical Industrial and Systems EngineeringUniversity of Rhode IslandKingstonRI02881USA Department of Mechanical and Aerospace Engineering University of VirginiaCharlottesvilleVA22904USA Department of Materials Science and Engineering University of VirginiaCharlottesvilleVA22904USA Department of Physics University of VirginiaCharlottesvilleVA22904USA

We discuss the role of atomic coordination in dictating the vibrational characteristics and thermal conductivity in amorphous *** systematic atomistic simulations on amorphous carbon structures at varying mass densities show the significant role played by the ratio of sp2 to sp3 hybridized bonds in dictating the contributions from propagating(phonon-like)and non-propagating vibrational modes and their influence on the overall thermal conductivities of the ***,our results show that as the concentration of sp3-bonded carbon atoms increases,the thermal conductivity can be increased by four fold,which is attributed to enhanced contributions from propagating modes in these amorphous *** results shed more light into the role of atomic coordination on dictating heat transfer mechanisms in amorphous materials,and also provide a deeper understanding of the ability to tune the thermal conductivity of amorphous carbon structures through the control of the local atomic coordination.

关键词： amorphous conductivity thermal

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Effect of Cu addition on electrochemical activity of ribbons of Mg-Al-Ca anode materials for magnesium rechargeable batteries manufactured by rapid solidification method

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Keikinzoku/Journal of Japan Institute of Light Metals 2024年第1期74卷 14-17页

作者： Fukui, Shunsaku Tsukeda, Tadayoshi Aida, Tetsuo Tabata, Hironobu Kurihara, Hideki Suzuki, Mayumi Program of Materials Science and Engineering Studies in Science and Engineering Graduate School of Science and Engineering University of Toyama 3190 Gofuku Toyama-shi Toyama930-8555 Japan Faculty of Sustainable Design Academic Assembly University of Toyama Toyama-shi Toyama Japan CHUETSU METAL WORKS CO. LTD. Nakaniikawa-gun Toyama Japan Saitama Industrial Technology Center Kawaguchi Kawaguchi-shi Saitama Japan Department of Mechanical Systems Engineering Faculty of Engineering Toyama Prefectural University Imizu-shi Toyama Japan

The potential for magnesium storage batteries to become the next generation of rechargeable batteries is high. This is largely due to the abundance of magnesium metal resources and their high safety and electric capacity per volume. Our research team has been studying magnesium alloys as anode materials for these batteries. Specifically, we have been investigating the electrochemical activity and mechanism of adding copper to Mg-9mass%Al and Mg-9mass%Al-3mass%Ca. Our findings indicate that the electrochemical activity increased with the addition of 1mass%Cu, but decreased with the addition of 3mass%Cu. In addition, changes in lattice constant and basal orientation were also observed. These changes decreased with 1mass%Cu and increased with 3mass%Cu. SEM observations showed that the cell delimitation was indistinct for the 1%Cu addition. © 2024 The Japan Institute of Light Metals.

关键词： Secondary batteries

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Corrosion behavior of Mg-Zn-Zr-RE alloys under physiological environment-Impact on mechanical integrity and biocompatibility

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Journal of Magnesium and Alloys 2022年第6期10卷 1542-1572页

作者： Marwa AbdelGawad Chaudhry A.Usman Vasanth C.Shunmugasamy Ibrahim Karaman Bilal Mansoor Mechanical Engineering Program Texas A&M University at QatarEducation CityDoh1Qatar Department of Mechanical Engineering Texas A&M University3123 TAMUCollege StationTX 77843United States of America Department of Materials Science and Engineering Texas A&M University3003 TAMUCollege StationTX 77843United States of America

Benefits of RE addition on Mg alloys strength and corrosion resistance are widely reported but their effects on biodegradability and biocompatibility are still of *** paper investigates the effect of RE additions on biodegradability of Mg-Zn alloys under simulated physiological *** this context,two commercial Mg-Zn-Zr-RE alloys,namely ZE41 and EZ33,with same RE addition but different concentrations are studied in Hank’s Balanced Salt Solution(HBSS)at 37℃and with pH of ***-loss,hydrogen evolution,real-time insitu drop test,electrochemical impedance spectroscopy(EIS)and potentiodynamic polarization are deployed to study corrosion *** mechanical integrity of both alloys is assessed by mechanical testing post ***,in vitro biocompatibility is evaluated by indirect cytotoxicity tests using NIH3T3 *** reveal that although both alloys showed similar microstructure,size and distribution of precipitates played a significant role on its corrosion *** and open circuit potential results show stable film formation on EZ33,while ZE41 showed passive layer formation followed by its deterioration,over the analyzed time *** real-time drop test,it was shown in ZE41 alloy that both T-phase and Zr-rich precipitates acted as micro cathodes,resulting in an unstable surface *** EZ33,Zr-rich regions did not influence corrosion response,resulting in better corrosion resistance that was corroborated by post-immersion surface morphology *** higher degradation observed in ZE41 alloy resulted in higher drop in flexural and tensile strength compared to EZ33 *** addition,cytotoxicity tests on NIH3T3 cells revealed that cell viability of EZ33 increased with increasing incubation time,contrary to ZE41,owing to its lower biodegradation behavior and despite higher concentrations of *** results show that an increase in RE concentration in EZ33,relative to ZE41,had a positive effect on

关键词： Magnesium alloy Corrosion EIS mechanical integrity Cytotoxicity

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Small water supply system with plasma-modified poly(tetrafluoroethylene) membrane for drinking water production

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Process Safety and Environmental Protection 2024年 185卷 754-760页

作者： Chang, Ying-Ju Chang, Jo-Shu Lee, Duu-Jong Huang, Chihpin Department of Chemical Engineering National Taiwan University Taipei10617 Taiwan Research Center for Smart Sustainable Circular Economy Tunghai University Taichung 407 Taiwan Department of Chemical and Materials Engineering Tunghai University Taichung 407 Taiwan Department of Mechanical Engineering City University of Hong Kong Kowloon Tong Hong Kong Department of Chemical Engineering & Materials Science Yuan Ze University Chung-Li32003 Taiwan Institute of Environmental Engineering National Yang Ming Chiao Tung University Hsinchu300 Taiwan

The small water supply systems aim at supplying safe drinking water to small communities in remote areas. This study applies an automatic small water supply system comprising 20 plasma-grafted poly(tetrafluoroethylene) (PTFE) membranes with a 1.42 m2 filtration area to generate permeate at a capacity of 3 m3/day from raw water collected from a local river. The system was tested by 34 days in phase I with bubble scraping and by 120 days in phase II without bubbling, with water quality, cross-membrane pressure drops, and dissolved organic carbons’ and foulants’ characteristics being recorded. Even with typhoon water turbidity up to 1714 nephelometric turbidity units (NTU), the system yields drinking water, meeting Taiwan's standards. The system is fully automatic with no coagulant or disinfectant doses;an operational cost of 0.21 USD/m3 is proposed, much lower than the tariffs applied in most countries. The foulant characteristics and washing efficiencies noted are discussed. © 2024 The Institution of Chemical Engineers

关键词： Water supply

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Structured Bayesian Meta-Learning for Data-Efficient Visual-Tactile Model Estimation 8

Structured Bayesian Meta-Learning for Data-Efficient Visual-...

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8th Conference on Robot Learning, CoRL 2024

作者： Yao, Shaoxiong Zhu, Yifan Hauser, Kris Department of Computer Science University of Illinois Urbana-ChampaignIL United States Department of Mechanical Engineering and Materials Science Yale University CT United States

Estimating visual-tactile models of deformable objects is challenging because vision suffers from occlusion, while touch data is sparse and noisy. We propose a novel data-efficient method for dense heterogeneous model estimation by leveraging experience from diverse training objects. The method is based on Bayesian Meta-Learning (BML), which can mitigate overfitting high-capacity visual-tactile models by meta-learning an informed prior and naturally achieves few-shot online estimation via posterior estimation. However, BML requires a shared parametric model across tasks but visual-tactile models for diverse objects have different parameter spaces. To address this issue, we introduce Structured Bayesian Meta-Learning (SBML) that incorporates heterogeneous physics models, enabling learning from training objects with varying appearances and geometries. SBML performs zero-shot vision-only prediction of deformable model parameters and few-shot adaptation after a handful of touches. Experiments show that in two classes of heterogeneous objects, namely plants and shoes, SBML outperforms existing approaches in force and torque prediction accuracy in zero- and few-shot settings. Website: https://***/SBML. © 2024 Proceedings of Machine Learning Research.

关键词： Zero-shot learning

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Experimental design of paraffin/methylated melamine-formaldehyde microencapsulated composite phase change material and the application in battery thermal management system

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Journal of materials science & Technology 2024年第2期169卷 124-136页

作者： Que Huang Silong Wang Jichun He Dengji Xu Safaa NAbdou Mohamed MIbrahim Shiqi Sun Yanjun Chen Handong Li Ben Bin Xu Changcheng Liu Zeinhom M.El-Bahy Zhanhu Guo School of Environment and Safety Engineering North University of ChinaTaiyuan 030051China Institute of Advanced Energy Materials and Systems North University of ChinaTaiyuan 030051China School of Resources and Safety Engineering Central South UniversityChangsha 410010China School of Medical and BioInformation Engineering Northeastern UniversityShenyang 110819China Department of Chemistry Khurmah University CollegeTaif UniversityP.O.Box 11099Taif 21944Saudi Arabia Department of Chemistry College of ScienceTaif UniversityP.O.Box 11099Taif 21944Saudi Arabia Mechanical and Construction Engineering Faculty of Engineering and EnvironmentNorthumbria UniversityNewcastle Upon Tyne NE18STUK College of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024China Department of Chemistry Faculty of ScienceAl-Azhar UniversityNasr City 11884CairoEgypt

In order to maintain the optimal operating temperature of the battery surface and meet the demand for thermal storage technology,battery thermal management system based on phase change materials has attracted increasing *** this work,a kind of core-shell structured microcapsule was synthesized by an in-situ polymerization,where paraffin was used as the core,while methanol was applied to mod-ify the melamine-formaldehyde shell to reduce toxicity and improve thermal ***,three different types of heat conductive fillers with the same content of 10 wt.%,i.e.,nano-Al_(2)O_(3),nano-ZnO and carbon nanotubes were added,generating *** microcapsules were uniform,and were not affected by the thermal fillers,which were evenly dispersed *** composite sample with carbon nanotubes(10 wt.%)showed the highest thermal conductivity of 0.50 W/(m K)and latent heat of 139.64 J/***,according to the leakage testing and battery charge/discharge experiments,compared with Al_(2)O_(3)and ZnO,the addition of carbon nanotubes remarkably enhances the heat storage ability as latent heat from 126.98 J/g for the prepared sample with Al_(2)O_(3)and 125.86 J/g for the one with ZnO,then to 139.64 J/g,as well as dissipation performance as a cooling effect by decreasing the sur-face temperature of battery from 2%to 12%of microcapsule,composite sample with carbon nanotubes presents a broad application prospect in battery thermal management system and energy storage field.

关键词： Microcapsule Phase change material Battery Carbon nanotube Safety

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Unraveling precipitation evolution and strengthening function of the Al-Zn-Mg-Cu alloys with various Zn contents:Multiple experiments and integrated internal-state-variable modeling

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Journal of materials science & Technology 2022年第21期116卷 130-150页

作者： Jie Tang Mingcai Liu Guowei Bo Fulin Jiang Chunhui Luo Jie Teng Dingfa Fu Hui Zhang College of Materials Science and Engineering Hunan UniversityChangsha 410082China Department of Mechanical Engineering Technical University of MunichMünchen 80333Germany Swerim AB Stockholm 16407Sweden

Zn content is one of the most concerned factors in the development of next generation ultra-strength Al-Zn-Mg-Cu alloys owing to its essential role in precipitation *** the present work,the underlying functions of Zn content in precipitation evolution and strengthening function of Al-Zn-Mg-Cu alloys were systematically investigated by combining multiple experiments and an integrated internalstate-variable *** experimental results indicated that the increased Zn content in Al-Zn-Mg-Cu alloys would promote the development of precipitates and enhance aging *** diffusion flux of soluble Zn and the coordination of Mg atom controlled the crystallographic microstructures evolution during precipitates nucleation,growth and transition *** integrating precipitation development with electrical resistivity and hardness evolutions,an improved internal-state-variable physical model was then developed for the aging responses of Al-Zn-Mg-Cu *** unified model considered the intrinsic characteristics of precipitates such as crystallographic orientation,morphology,component,and *** specific improvements were to balance the combined functions of Zn element and Mg element and consider the plate-like morphology and directed growth as indicated by *** model was also adaptive to heat-treatment variables and chemical compositions,and owned the notable advantages to simultaneously rationalize the observed microstructural characteristics,mechanical and electrical properties following artificial aging of Al-Zn-Mg-Cu *** addition,a preliminary model framework between electrical resistivity and hardness for Al-Zn-Mg-Cu alloys was established.

关键词： Al-Zn-Mg-Cu alloys Precipitation Strengthening In situ electrical resistivity Modeling

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Off-stoichiometry-guided design of high-strength chemically complex intermetallic-based alloys with outstanding ductility

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Journal of materials science & Technology 2023年第29期160卷 28-33页

作者： Bo Xiao Jixun Zhang Shaofei Liu Yilu Zhao Lianyong Xu C.T.Liu Tao Yang Department of Materials Science and Engineering Mechanical Behavior Division of Shenyang National Laboratory for Materials ScienceCity University of Hong KongHong KongChina Center for Advanced Nuclear Safety and Sustainable Development City University of Hong KongHong KongChina Hong Kong Institute for Advanced Study City University of Hong KongHong KongChina School of Materials Science and Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China School of Materials Science and Engineering Tianjin UniversityTianjin 300350China

*** The lasting drive for improved energy efficiency in power gen-eration encourages the innovative design of advanced structural materials with superb mechanical properties[1-6].Among these materials,ordered intermetallic alloys[7-9],as a unique class of metallic materials,have drawn increasing concern from both the scientific and industrial communities due to their intriguing high-temperature properties,strong chemical binding,and low atomic mobility[10,11].However,in light of the insufficient number of slip systems and/or intrinsically weak grain boundary(GB),they are usually brittle at ambient temperature,severely hindering their practical use in engineering systems[12].Previous studies reported that the change in alloy stoichiometry has a significant beneficial effect on the ductility of intermetallic *** instance,Liu et al.

关键词： intermetallic ductility alloys

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A Simple Dynamic Controller for Emulating Human Balance Control 12th

A Simple Dynamic Controller for Emulating Human Balance Cont...

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Proceedings of the 12th International Conference on Biomimetic and Biohybrid Systems, Living Machines 2023

作者： McNeal, J. Stu Hunt, Alexander Department of Mechanical and Materials Engineering Maseeh College of Engineering and Computer Science Portland State University PortlandOR97201 United States

ISBN: (纸本)9783031395031

This paper presents a biologically inspired control system developed for maintaining balance in a simulated human atop an oscillating platform. This work advances our previous research by adapting a human balance controller to an inverted pendulum and controlled by linear-Hill muscle models. To expedite neuron/synapse parameter value selection, we employ a novel two-stage process that pairs a previously developed analytic method with particle swarm optimization. Using the parameter values found analytically as inputs for particle swarm optimization (PSO), we take advantage of the benefits of each method while avoiding their pitfalls. Our results show that PSO optimization allowed improved balance control from modest ( © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Inverted pendulum

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