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arXiv 2024年

作者： Meng, Chuxiao Porter, Conor Malakpour, Sina Mathesen, Garrett Yang, Seongyeon Cao, Jian Department of Mechanical Engineering Northwestern University United States Department of Material Science and Engineering Northwestern University United States Department of Public Policy University of Chicago United States

(Real time, high accuracy, low cost, scalable Pore formation during Laser Powder Bed Fusion (LPBF) has long posed challenges in metal 3D printing, significantly affecting the mechanical properties of the final product. Porosity frequently occurs because of an unstable keyhole formation, triggered by an excess laser energy. Traditional approaches for detecting pores rely heavily on CT scanning, a time-consuming and costly method unsuitable for large-scale production. In response to these limitations, we have developed a real-time pore detection method using thermal sensor data, offering a more efficient, cost-effective alternative for quality control during the LPBF process. Our method, validated against CT-scanned pore counts, provides a high degree of accuracy, achieving an R2 value of 0.94 between the across eight sample prints. This approach also effectively tracks pore formation trends as the layer-wise printing pattern changes, providing timely insights into product quality, which may serve as important datapoints for real-time adaptive parameters optimization in the future. In contrast to prior machine learning-based techniques, which were limited by high computational costs and lacked direct validation strategy, the method introduced in this paper is not only faster and simpler but also highly scalable for industrial *** Codes no Copyright © 2024, The Authors. All rights reserved.

关键词： Computerized tomography

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Magneto-optical Kerr spectra of gold induced by spin accumulation

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Physical Review B 2022年第1期106卷 014410-014410页

作者： Víctor H. Ortiz Sinisa Coh Richard B. Wilson Department of Mechanical Engineering and Materials Science and Engineering Program University of California Riverside 92521 CA United States

We report the magneto-optic Kerr effect (MOKE) angle of Au magnetically excited by spin accumulation. We perform time-resolved polar MOKE measurements on Au/Co heterostructures. In our experiment, the ultrafast optical excitation of the Co drives spin accumulation into an adjacent Au layer. The spin accumulation, together with spin-orbit coupling, leads to nonzero terms in the off-diagonal conductivity tensor of Au, which we measure by recording the polarization and ellipticity of light reflected from the Au surface for photon energies between 1.3 and 3.1 eV. In a narrow energy range near the interband transition threshold of Au, the sensitivity to magnetization measured exceeds 1μradperA/m. In the photon energy interval of 0.6–4.4 eV, the maximum value for transition ferromagnetic metals like Ni are <10nradperA/m, while predicted values for heavy metals like Pt or W are <13nradperA/m. The exceptional sensitivity of the optical properties of Au to spin magnetic moments make Au an exceptionally sensitive optical magnetometer, with potential applications in the development of optospintronic technologies.

关键词： Density of states Magneto-optical Kerr effect Spin accumulation Ultrafast magnetic effects

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Dynamics of self-hybridized exciton–polaritons in 2D halide perovskites

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Light(science & Applications) 2024年第1期13卷 13-22页

作者： Surendra B.Anantharaman Jason Lynch Christopher E.Stevens Christopher Munley Chentao Li Jin Hou Hao Zhang Andrew Torma Thomas Darlington Francis Coen Kevin Li Arka Majumdar PJames Schuck Aditya Mohite Hayk Harutyunyan Joshua R.Hendrickson Deep Jariwala Department of Electrical and Systems Engineering University of PennsylvaniaPhiladelphiaPA19104USA KBR Inc. BeavercreekOH45431USA Air Force Research Laboratory Sensors DirectorateWright-Patterson Air Force BaseOH45433USA Department of Physics University of WashingtonSeattleWA98195USA Department of Physics Emory UniversityAtlantaGA30322USA Department of Chemical and Biomolecular Engineering Rice UniversityHoustonTX77005USA Department of Materials Science and Nanoengineering Rice UniversityHoustonTX77005USA Applied Physics Program Smalley‐Curl InstituteRice UniversityHoustonTX77005USA Department of Mechanical Engineering Columbia UniversityNew YorkNY10027USA Department of Electrical and Computer Engineering University of WashingtonSeattleWA98195USA

Excitons,bound electron–hole pairs,in two-dimensional hybrid organic inorganic perovskites(2D HOIPs)are capable of forming hybrid light-matter states known as exciton-polaritons(E–Ps)when the excitonic medium is confined in an optical *** the case of 2D HOIPs,they can self-hybridize into E–Ps at specific thicknesses of the HOIP crystals that form a resonant optical cavity with the ***,the fundamental properties of these self-hybridized E–Ps in 2D HOIPs,including their role in ultrafast energy and/or charge transfer at interfaces,remain ***,we demonstrate that>0.5µm thick 2D HOIP crystals on Au substrates are capable of supporting multiple-orders of self-hybridized E–P *** E–Ps have high Q factors(>100)and modulate the optical dispersion for the crystal to enhance sub-gap absorption and *** varying excitation energy and ultrafast measurements,we also confirm energy transfer from higher energy E–Ps to lower energy E–***,we also demonstrate that E–Ps are capable of charge transport and transfer at *** findings provide new insights into charge and energy transfer in E–Ps opening new opportunities towards their manipulation for polaritonic devices.

关键词： charge polar excitation

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A review of noncatalytic and catalytic pyrolysis and co-pyrolysis products from lignocellulosic and algal biomass using Py-GC/MS

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Journal of Industrial and engineering Chemistry 2024年 134卷 51-64页

作者： Chen, Wei-Hsin Ho, Kuan-Yu Aniza, Ria Sharma, Amit Kumar Saravanakumar, Ayyadurai Hoang, Anh Tuan Department of Aeronautics and Astronautics National Cheng Kung University Tainan701 Taiwan Research Center for Smart Sustainable Circular Economy Tunghai University Taichung407 Taiwan Department of Mechanical Engineering National Chin-Yi University of Technology Taichung411 Taiwan International Doctoral Degree Program on Energy Engineering National Cheng Kung University Tainan701 Taiwan Uttarakhand Dehradun248007 India Directorate of Research SRM Institute of Science and Technology Kattankulathur - 603203 Chengalpattu District Tamil Nadu India Faculty of Automotive Engineering Dong A University Danang Viet Nam

Biomass pyrolysis has garnered significant attention as a sustainable energy production method utilizing various biomass feedstocks. Pyrolysate is any product generated from the pyrolysis process, including solid, liquid, and gas types. This review focuses on the application of analytical pyrolysis–gas chromatography/mass spectrometry (Py-GC/MS) in the context of four pyrolysis modes: single feedstock pyrolysis, co-pyrolysis, catalytic pyrolysis, and catalytic co-pyrolysis to gain insights into the characteristics of the pyrolysates. A comprehensive understanding of each pyrolysis mode's unique products, benefits, and limitations is achieved by analyzing the pyrolysates of different feedstocks, including lignocellulosic and algal biomass. Moreover, this study discusses the integration of Py-GC/MS with techniques such as density function theory (DFT), which focuses on estimating the reactions’ activation energies or kinetic studies concentrating on the reaction rate and mechanism to gain further insight into pyrolysis mechanisms. Lastly, design of experiment (DoE) techniques are proposed for pyrolysis optimization to obtain a more comprehensive assessment of the parameter's influence on pyrolysis factors and levels. © 2024 The Author(s)

关键词： Pyrolysis

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Direct Teaching/Playback Method for the Contact Task of a Six-DOF Manipulator Using a Parallel-Wire-Type Teaching Device with a Remote Center Compliance Device 23

Direct Teaching/Playback Method for the Contact Task of a Si...

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23rd International Conference on Control, Automation and Systems, ICCAS 2023

作者： Okochi, Tatsuya Sakai, Masao Morita, Yoshifumi Graduate School of Engineering Nagoya Institute of Technology Electrical and Mechanical Engineering Program Department of Engineering Gokiso-cho Aichi Nagoya466-8555 Japan Industrial Research Center Aichi Center for Industry and Science Technology Onda-cho 1-157-1 Aichi Kariya-shi448-0013 Japan Nagoya Institute of Technology Department of Electrical and Mechanical Engineering Gokiso-cho Showa-ku Aichi Nagoya466-8555 Japan

ISBN: (纸本)9788993215274

This study proposes a direct teaching method for the task of pressing an end effector attached to a robot manipulator against a workpiece with a constant force. When performing contact tasks, such as deburring or polishing using a manipulator, a passive compliance is required for the end effector to suppress excessive contact force and impact. Therefore, we developed an end effector that combines a 'parallel wire-type teaching device,' which enables direct teaching, and a compliance device. In the case of pressing a workpiece with a constant force, after teaching the robot's trajectory to trace the edge of the workpiece, the amount of pressing can be calculated from the stiffness of the end effector and the desired pressing force;the robot's trajectory can be edited to teach contact tasks. An experiment was conducted to press a straight trajectory with a constant force as the target value and evaluate the accuracy of force teaching. © 2023 ICROS.

关键词： End effectors

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Divergent Evolution of Slip Banding in Alloys

arXiv

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arXiv 2024年

作者： Xie, Bijun Chen, Hangman Wang, Pengfei Zhang, Cheng Xing, Bin Xu, Mingjie Wang, Xin Valdevit, Lorenzo Rimoli, Julian Pan, Xiaoqing Cao, Penghui Department of Mechanical and Aerospace Engineering University of California IrvineCA92697 United States Department of Material Science and Engineering University of California IrvineCA92697 United States

Metallic materials under high stress often exhibit deformation localization, manifesting as slip banding. Over seven decades ago, Frank and Read introduced the well-known model of dislocation multiplication at a source, explaining slip band formation. Here, we reveal two distinct types of slip bands (confined and extended) in alloys through multi-scale testing and modeling from microscopic to atomic scales. The confined slip band, characterized by a thin glide zone, arises from the conventional process of repetitive full dislocation emissions at Frank–Read source. Contrary to the classical model, the extended band stems from slip-induced deactivation of dislocation sources, followed by consequent generation of new sources on adjacent planes, leading to rapid band thickening. Our findings provide critical insights into atomic-scale collective dislocation motion and microscopic deformation instability in advanced structural materials, marking a pivotal advancement in our fundamental understanding of deformation dynamics. Copyright © 2024, The Authors. All rights reserved.

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Development of processing map for InX-750 superalloy using hyperbolic sinus equation and ANN model

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Rare Metals 2021年第12期40卷 3598-3607页

作者： Saeed Aliakbari Sani Ali Khorram Abed Jaffari Golamreza Ebrahimi School of Metallurgy and Materials Engineering Iran University of Science and TechnologyNarmakTehran 16846-13114Iran Department of Mechanical Engineering KNToosi University of TechnologyTehran 19395-1999Iran Department of Material and Metallurgy Engineering Iran University of Industries and Mines(IUIM)Tehran 19537-65733Iran Materials and Polymers Engineering Department Faculty of EngineeringHakim Sabzevari UniversitySabzevar 96179-76487Iran

The aim of this study is to develop processing maps based on two models and compare them with conventional processing *** hyperbolic sinus constitutive equation and artificial neural network(ANN)approaches were used in this investigation to predict flow stress and to develop processing maps in various *** hot compression tests of InX-750 superalloy were carried out above the gamma prime phase temperature and within the temperature range of 1000-1150℃and strain rate of 0.001-1.000 s^(-1).The processing maps were conducted based upon dynamic material model(DMM)for data by experimental,constitutive equation and ANN *** processing maps drawn by either of the prediction methods show that the method developed by ANN data does not significantly differ from the experimental processing *** ANN approach is thus a suitable way to predict the flow stress as well as hot working processing map of engineering metals and materials.

关键词： Hot deformation Hyperbolic sine equation ANN model Prediction Processing map

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Understanding The Effect Of Process Parameters On Three-Dimensional Pore Configurations And mechanical Properties Of Laser Additive Manufactured Ti Using Synchrotron X-Ray Computed Tomography And Homology

Understanding The Effect Of Process Parameters On Three-Dime...

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World PM 2022 Congress and Exhibition

作者： Yuji, Shigeta Masatoshi, Aramaki Kentaro, Kudo Kazunari, Shinagawa Naoyuki, Nomura Katsuyoshi, Kondoh Masato, Hoshino Kentaro, Uesugi Yukiko, Ozaki Department of Materials Graduate School of Engineering Kyushu University Japan Department of Material Science and Engineering Faculty of Engineering Kyushu University Japan Department of Mechanical Engineering Faculty of Engineering Kyushu University Japan Department of Materials Processing Graduate School of Engineering Tohoku University Japan Joining and Welding Research Institution Osaka University Japan Japan

ISBN: (纸本)9781899072552

To establish a quantitative relationship between fabrication parameters, pore-configuration, and mechanical properties in porous materials, the pore configurations were visualized by X-ray computed tomography (CT) about pure Ti-AM specimens fabricated under different laser beam conditions. Radius and sphericity of all pores were obtained by image analysis. Furthermore, using the 0th persistent homology, the pore configurations were qualified by the pair of birth and death values, b and d for all pores: |b| means a pore radius and d correspond to a half distance between adjacent pores. The significant correlations were confirmed between tensile strength/elongation and the parameters: the maximum value of |b|, the ratio of the mean values of |b| and d (neck geometry), and the sphericity of the largest pore. These were proposed as useful structural parameters representing 3D pore-structure in porous materials. © European Powder Metallurgy Association (EPMA)

关键词： Laser beams

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Morphologic recovery method of product label noises based on image features and application in defect detection

Morphologic recovery method of product label noises based on...

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2021 International Symposium on Artificial Intelligence and Intelligent Manufacturing, AIIM 2021

作者： Chen, Yuanhao Yi, Jianjun Zhang, Yajun Tao, Sheng School of Mechanical Engineering East China University of Science and Technology Shanghai200237 China Shanghai Composite Material Technology Co. Ltd Shanghai201100 China

To ensure the reliability of carbon fiber material products and eliminate all kinds of possible defects, it is necessary to take effective means to check their quality. X-ray based nondestructive testing technology combined with image recognition algorithm is considered to be a fast and efficient solution. However, the surface of the processed material is often accompanied by labels which contains various information. These labels are confused in the image and make most of the defect detection methods easy to misidentify. This paper mainly studies the recovery method of product label noises based on image features and application in defect detection. What's more, the proposed method can effectively and efficiently eliminate noises without affecting the rest of the image information which ensures the correct identification of defects in materials. © Published under licence by IOP Publishing Ltd.

关键词： Defects

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Hierarchical Polyimide Nonwoven Fabric with Ultralow-Reflectivity Electromagnetic Interference Shielding and High-Temperature Resistant Infrared Stealth Performance

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Nano-Micro Letters 2025年第4期17卷 111-129页

作者： Xinwei Tang Yezi Lu Shuangshuang Li Mingyang Zhu Zixuan Wang Yan Li Zaiyin Hu Penglun Zheng Zicheng Wang Tianxi Liu The Key Laboratory of Synthetic and Biological Colloids Ministry of EducationSchool of Chemical and Material EngineeringInternational Joint Research Laboratory for Nano Energy CompositesJiangnan UniversityWuxi 214122JiangsuPeople’s Republic of China Jiangsu Ferrotec Semiconductor Technology Co. Ltd.Yancheng 214000JiangsuPeople’s Republic of China Guizhou Aerospace Wujiang Electro-Mechanical Equipment Co. Ltd.No.20-5Dalian Road Aerospace Industrial ParkHuichuan DistrictZunyi City 563000GuizhouPeople’s Republic of China Civil Aircraft Fire Science and Safety Engineering Key Laboratory of Sichuan Province College of Civil Aviation Safety EngineeringCivil Aviation Flight University of ChinaGuanghan 618307SichuanPeople’s Republic of China

Designing and fabricating a compatible low-reflectivity electromagnetic interference(EMI)shielding/high-temperature resistant infrared stealth material possesses a critical significance in the field of ***,a hierarchical polyimide(PI)nonwoven fabric is fabricated by alkali treatment,in-situ growth of magnetic particles and"self-activated"electroless Ag plating ***,the hierarchical impedance matching can be constructed by systematically assembling Fe_(3)O_(4)/Ag-loaded PI nonwoven fabric(PFA)and pure Ag-coated PI nonwoven fabric(PA),endowing it with an ultralowreflectivity EMI shielding *** addition,thermal insulation of fluffy three-dimensional(3D)space structure in PFA and low infrared emissivity of PA originated from Ag plating bring an excellent infrared stealth *** importantly,the strong bonding interaction between Fe_(3)O_(4),Ag,and PI fiber improves thermal stability in EMI shielding and high-temperature resistant infrared stealth *** excellent comprehensive performance makes it promising for military tents to protect internal equipment from electromagnetic interference stemmed from adjacent equipment and/or enemy,and inhibit external infrared detection.

关键词： Polyimide Electromagnetic interference shielding Low reflectivity Infrared stealth Compatibility

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