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Potential application of graphene nanoplatelets as a high temperature lubricant for hot rolling

Friction 2022年第11期10卷 1810-1823页

作者： Long WANG Anh Kiet TIEU Ming MA Jiaqing LI Guojuan HAI Hongtao ZHU State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsNorthwestern Polytechnical UniversityXi’an 710021China School of Mechanical MaterialsMechatronic and Biomedical EngineeringFaculty of Engineering and Information SciencesUniversity of WollongongNorthfields AvenueWollongongNSW 2522Australia State Key Laboratory of Tribology Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China School of Materials Science and Engineering Shaanxi University of Science and TechnologyXi’an 710021China

Graphene has been shown to be a promising solid lubricant to reduce friction and wear of the sliding counterparts,and currently is reported to only function below 600℃.In this study,its potential as a lubricant above 600℃ was studied using a ball-on-disc tribo-meter and a rolling *** results suggest that a reduction up to 50%can be obtained with graphene nanoplatelets(GnP)under lubricated conditions between 600 and 700℃ when compared with dry *** this friction reduction can last more than 3 *** 800 and 900℃,the friction reduction is stable for 70 and 40 s,respectively,which indicates that GnP can potentially provide an effective lubrication for hot metal forming *** rolling experiments on steel strips indicate that GnP reduces the rolling force by 11%,7.4%,and 6.9%at 795,890,and 960℃,*** friction reductions are attributed to the easily sheared GnP between the rubbing interfaces.A temperature higher than 600℃ will lead to the gasification of the residual graphene on the strip surface,which is believed to reduce the black contamination from traditional graphite lubricant.

关键词： graphene high temperature lubricant hot rolling tribology properties

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Implementation of the Simple Algorithm for Space Charge Limited Emission in a 1-D Particle-in-Cell Simulation 24

Implementation of the Simple Algorithm for Space Charge Limi...

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24th International Vacuum Electronics Conference, IVEC 2023

作者： Wang, Guo-Ning Aranganadin, Kaviya Hsu, Hua-Yi Verboncoeur, John P. Lin, Ming-Chieh Hanyang University Multidisciplinary Computational Laboratory Department of Electrical and Biomedical Engineering Seoul04763 Korea Republic of National Taipei University of Technology Department of Mechanical Engineering Taipei10608 Taiwan Michigan State University Department of Electrical and Computer Engineering Michigan48824 United States

ISBN: (纸本)9781665473217

Cathode emission in most vacuum electronic devices (VEDs) operates in a space-charge limited regime where the current density drawn is limited by the self-fields of the space charges. In particle-in-cell (PIC) simulations, the implementation of the space charge limited emission is not trivial and sometimes an over emission or nonphysical effects might be generated. In this paper, we present the implementation of the simple algorithm proposed by Stoltz et al. for space-charge limited emission in 1-D PIC simulations. The algorithm uses the value of the electric field in front of the cathode surface instead of attempting to zero the field at the surface, making the algorithm particularly well suited to the PIC simulations. For demonstration, the 1-D bounded electrostatic PIC code, XPDP1, developed by Plasma Theory and Simulation Group (PTSG), formerly at UC Berkeley, now at Michigan State University is used to simulate a space charge limited diode in which the steady-state limiting current should follow the Child-Langmuir law. After implementing the simple algorithm in the XPDP1 code, the surface electric field is computed accurately by applying the Gauss law to the surface grid and the turn on of the space charge limited emission in the planar diode is studied carefully. The simple algorithm can be further implemented to 2-D or 3-D PIC simulations for modeling VEDs with space charge limited emission. The detailed implementation and simulation results will be presented and discussed. © 2023 IEEE.

关键词： Electric space charge

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Na-22 for Safeguarding and Mass Accounting of Molten Salt Systems

Na-22 for Safeguarding and Mass Accounting of Molten Salt Sy...

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2023 Transactions of the American Nuclear Society Winter Conference and Expo, ANS 2023

作者： Zile, Matthew Van Kauffman, Andrew Herminghuysen, Kevin Li, Shelly Simpson, Michael Kandlakunta, Praneeth Cao, Guoping Cao, Lei R. Nuclear Engineering Program Department of Mechanical and Aerospace Engineering Ohio State University United States Nuclear Reactor Laboratory College of Engineering Ohio State University United States Department of Materials Science and Engineering University of Utah.Idaho National Laboratory United States

The Na-22based radioactive tracer dilution (RTD) technique has been previously demonstrated for mass accounting in small quantities of clean molten salt for bench top testing. While the concept of RTD has proven to be a promising method, it has lacked further validation in large-scale quantities and in fuel-bearing salt. Towards that end, two research initiatives are on-going at The Ohio State University (OSU) and Idaho National Laboratory (INL) to address these challenges. Current work at OSU is focused on evaluating the RTD using the full gamma-ray spectrum of fission products produced by irradiating fuel bearing salt, i.e., UCl3-MgCl2-KCl in a 500-kW research reactor. The INL team has successfully demonstrated the RTD for mass determination using an 8-kg LiCl-KCl-UCl3salt for uranium electrorefining and is currentlyseeking to validate the tracer method with large(about 60 kg)molten salt system(bearing fission products) in an oxide reduction (OR) facility for spent nuclear fuel (SNF) reprocessing. © 2023 American Nuclear Society. All rights reserved.

关键词： Fission products

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In vivo tumor ultrasound-switchable fluorescence imaging via intravenous injections of size-controlled thermosensitive nanoparticles

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Nano Research 2023年第1期16卷 1009-1020页

作者： Liqin Ren Yang Liu Tingfeng Yao Kytai TNguyen Baohong Yuan Ultrasound and Optical Imaging Laboratory Department of Bioengineeringthe University of Texas at ArlingtonArlingtonTX 76019USA Joint Biomedical Engineering Program the University of Texas at Arlington and the University of Texas Southwestern Medical CenterDallasTX 75390USA Department of Bioengineering the University of Texas at ArlingtonArlingtonTX 76019USA

Near-infrared fluorescence imaging has emerged as a noninvasive,inexpensive,and ionizing-radiation-free monitoring tool for assessing tumor growth and treatment *** particular,ultrasound switchable fluorescence(USF)imaging has been explored with improved imaging sensitivity and spatial resolution in centimeter-deep *** study achieved the size control of polymer-based and indocyanine green(ICG)encapsulated USF contrast agents,capable of accumulating in the tumor after intravenous *** nanoprobes varied in size from 58 to 321 *** bioimaging profiles demonstrated that the proposed nanoparticles can efficiently eliminate the background light from normal tissue and show a tumor-specific fluorescence enhancement in the BxPC-3 tumor-bearing mice models possibly via the enhanced permeability and retention *** vivo tumor USF imaging further demonstrated that these nanoprobes can effectively be switched“ON”with enhanced fluorescence in response to a focused ultrasound stimulation in the tumor microenvironment,contributing to the high-resolution USF ***,our findings suggest that ICG-encapsulated nanoparticles are good candidates for USF imaging of tumors in live animals,indicating their great potential in optical tumor imaging in deep tissue.

关键词： in vivo tumor imaging deep tissue near-infrared(NIR)imaging high resolution ultrasound-switchable fluorescence imaging indocyanine green(ICG)

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Influence of multitasking-induced mental workload on electrodermal activity and human cortisol 15

Influence of multitasking-induced mental workload on electro...

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15th biomedical engineering International Conference, BMEiCON 2023

作者： Pidech, Jutamas Neubert, Manida Swangnetr Chuchuen, Oranat Khon Kaen University Faculty of Engineering Biomedical Engineering Program Khon Kaen Thailand Chulalongkorn University Faculty of Engineering Department of Industrial Engineering Bangkok Thailand Chulalongkorn University Human-Robot Collaboration and Systems Integration Research Unit Bangkok Thailand Khon Kaen University Faculty of Engineering Department of Chemical Engineering Khon Khon Kaen Thailand

ISBN: (纸本)9798350345247

Current work environments have undergone a noticeable shift towards higher cognitive demands and increased involvement in multitask performance. It has therefore become crucial to investigate the levels of mental workload experienced by operators. Simulated cognitive multitasking, with varying workload intensity, duration and work order, was tested in 18 volunteers to determine its impact on task performance, perceived workload, galvanic skin response;GSR, and cortisol levels in sweat and saliva. The results showed that as workload intensity increased, there was a concurrent increase in perceived workload and a significant negative impact on task performance. As time progressed, there was a notable increase in performance. Differences in GSR can be observed based on time on task and order of stressor levels delivered to the participants. Preliminary results of cortisol levels in sweat and saliva showed distinct trends in relation to workload intensity. © 2023 IEEE.

关键词： Multitasking

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Integrated Platform for Automated Sample Preparation and Multiplexed Point-of-Care Diagnostics via Sequential Magnetofluidic Elution 26

Integrated Platform for Automated Sample Preparation and Mul...

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26th International Conference on Miniaturized Systems for Chemistry and Life Sciences, MicroTAS 2022

作者： Varon, Asher Lu, David Chen, Fan-En Trick, Alexander Y. Wang, Tza-Huei Department of Mechanical Engineering Johns Hopkins University MD United States Department of Biomedical Engineering Johns Hopkins University MD United States

ISBN: (纸本)9781733419048

Multiplexed detection for infectious disease is important for differentiating pathogens and providing accurate treatment. Herein, we present an integrated magnetofluidics platform capable of distributing captured DNA in a single sample up to 8 separate PCR reactions in a low-cost cartridge. More importantly, the instrument is portable and easy to operate, therefore making it an ideal platform for point-of-care diagnostics. As a demonstration, we detect 4 sexually transmitted infections and 2 antimicrobial-resistant mutations on the platform. © 2022 MicroTAS 2022 - 26th International Conference on Miniaturized Systems for Chemistry and Life Sciences. All rights reserved.

关键词： Diagnosis

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Effect of Sn addition on electrochemical activity of ribbons of Mg-Al-Ca anode material for rechargeable magnesium batteries fabricated by rapid solidification

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Keikinzoku/Journal of Japan Institute of Light Metals 2025年第1期75卷 9-13页

作者： Fukuta, Yoshitaka Kikura, Kensei 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 Graduate School of Science and Engineering University of Toyama Toyama-shi Toyama Japan Faculty of Sustainable Design Academic Assembly University of Toyama Toyama-shi Toyama Japan CHUETSU METAL WORKS CO. LTD. Nakaniikawagun Toyama Japan Saitama Industrial technology Center Kawaguchi-shi Saitama Japan Department of Mechanical Systems Engineering Faculty of Engineering Toyama Prefectural University Imizu-shi Toyama Japan

Magnesium-based batteries are potential candidates for next-generation rechargeable batteries due to the divalent nature of magnesium cations and the natural abundance of magnesium resources. In this study, the electrochemical activity of Mg-6mass%Al-3mass%Ca anodes combined with Sn was investigated. Thin ribbons of the anode specimens were prepared by a single-roll rapid solidification method. The results showed that the electrochemical activity increased upon adding 1 mass% Sn, while it decreased for 3 mass% Sn. Based on the results of an X-ray diffraction analysis, the addition of Sn led to the formation of Mg2Sn and Ca2Sn phases, which increased the lattice distortion. Scanning electron microscopy observations indicated that these secondary phases were homogeneously distributed for 1 mass% Sn addition, while they were coarsely distributed for 3 mass% Sn. © 2025 The Japan Institute of Light Metals.

关键词： X ray diffraction analysis

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Site Readiness Index for Implementing Industry 4.0 based on the Design Principles and Emerging Manufacturing Technologies

Site Readiness Index for Implementing Industry 4.0 based on ...

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IISE Annual Conference and Expo 2023

作者： Garbie, Ibrahim Parsaei, Hamid Garbie, Muhammad Department of Mechanical Engineering-Industrial Engineering Program College of Engineering Helwan University Cairo Egypt Wm Michael Barnes’64 Department of Industrial and Systems Engineering Texas A&M University College StationTX United States Department of Industrial Systems and Manufacturing Engineering Texas Tech University LubbockTX United States

ISBN: (纸本)9781713877851

Nowadays, Implementing Industry 4.0 (I4.0) has become an urgent mandate in manufacturing enterprises to increase the efficiency and effectiveness of production processes. Six design principles (DP) must be considered to meet the challenges of integrating I4.0 beside the emerging advanced manufacturing technologies (AMT). This paper summarizes the analysis and investigation into the importance of I4.0 side readiness that enables the customization of AMT with the DP. The principal aim of this paper is to support manufacturing enterprises by incorporating AMT with the DP, thus helping these enterprises identify their specific requirements for implementing industry 4.0/ smart manufacturing. A model of estimating side readiness by adopting the DP incorporating customizing AMT is also analyzed and presented. The side readiness index towards implementing I4.0 is assessed and illustrated through a numerical example. © IISE and Expo *** rights reserved.

关键词： Industry 4.0

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Bubble-pen lithography:Fundamentals and applications

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Aggregate 2022年第4期3卷 85-100页

作者： Pavana Siddhartha Kollipara Ritvik Mahendra Jingang Li Yuebing Zheng Walker Department of Mechanical Engineering The University of Texas at AustinAustinTexasUSA Department of Electrical and Computer Engineering The University of Texas at AustinAustinTexasUSA Material Science and Engineering Program Texas Materials InstituteThe University of Texas at AustinAustinTexasUSA

Developing on-chip functional devices requires reliable fabrication methods with high resolution for miniaturization,desired components for enhanced performance,and high throughput for fast prototyping and mass ***,laser-based bubble-pen lithography(BPL)has been developed to enable sub-micron linewidths,in situ synthesis of custom materials,and on-demand patterning for various functional components and *** exploits Marangoni convection induced by a laser-controlled microbubble to attract,accumulate,and immobilize particles,ions,and molecules onto different *** years have witnessed tremendous progress in theory,engineering,and application of BPL,which motivated us to write this ***,an overview of experimental demonstrations and theoretical understandings of BPL is ***,we discuss the advantages of BPL and its diverse applications in quantum dot displays,biological and chemical sensing,clinical diagnosis,nanoalloy synthesis,and *** conclude this review with our perspective on the challenges and future directions of BPL.

关键词： additive manufacturing capillary flow lithography marangoni convection microbubbles sensing

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Aerosol jet printing of piezoelectric surface acousticwave thermometer

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Microsystems & Nanoengineering 2023年第3期9卷 31-42页

作者： Nicholas McKibben Blake Ryel Jacob Manzi Florent Muramutsa Joshua Daw Harish Subbaraman David Estrada Zhangxian Deng Micron School of Materials Science and Engineering Boise State University1910 W University DriveBoiseID 83725USA Department of Mechanical and Biomedical Engineering Boise State UniversityBoiseID 83725USA School of Electrical Engineering and Computer Science Oregon State University2500 NW Monroe AvenueCorvallisOR 97331USA Idaho National Laboratory Idaho FallsID 83415USA Center for Advanced Energy Studies Idaho FallsID 83401USA

Surface acoustic wave(SAW)devices are a subclass of micro-electromechanical systems(MEMS)that generate an acoustic emission when electrically *** transducers also work as detectors,converting surface strain into readable electrical *** properties of the generated SAW are material dependent and influenced by external factors like *** monitoring temperature-dependent scattering parameters a SAW device can function as a thermometer to elucidate substrate *** fabrication of SAW sensors requires labor-and cost-intensive subtractive processes that produce large volumes of hazardous *** study utilizes an innovative aerosol jet printer to directly write consistent,high-resolution,silver comb electrodes onto a Y-cut LiNbO3 *** printed,two-port,20 MHz SAW sensor exhibited excellent linearity and repeatability while being verified as a thermometer from 25 to 200℃.Sensitivities of the printed SAW thermometer are−96.9×10^(−6)℃^(−1)and−92.0×10^(-6)℃^(−1) when operating in pulse-echo mode and pulse-receiver mode,*** results highlight a repeatable path to the additive fabrication of compact high-frequency SAW thermometers.

关键词： scattering wave surface

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