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SSRN 2022年

作者： Shanmugam, Sankaran Madhavan, R. Suwas, Satyam Ray, R.K. Padmanabhan, K.A. Department of Metallurgical and Materials Engineering Indian Institute of Technology Madras Chennai600036 India Center for Agile and Adaptive Additive Manufacturing University of North Texas DentonTX76205 United States Department of Materials Engineering Indian Institute of Science Bangalore560012 India Indian Institute of Engineering Science and Technology Shibpur Howrah711103 India Materials Science & Engineering Program Department of Mech. Eng. Anna University Chennai600025 India

Multiphase ferrite-bainite-martensite (F-B-M) microstructure processed through rolling and two-step cooling in a V-microalloyed steel exhibited excellent stability under strain-controlled fatigue. The steel exhibited a steady state response and even cyclic hardening up to a total strain amplitude of 0.6% and displayed a cyclic softening response at total strain amplitudes > 0.7%. To understand and determine the degradation mechanisms, a detailed transmission electron microscopic investigation was carried out in fatigue tested samples as a function of total strain amplitude. At low strain amplitudes ( © 2022, The Authors. All rights reserved.

关键词： Martensite

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Mechanical and electrical properties of 3d printed pa6 nanocomposites

Mechanical and electrical properties of 3d printed pa6 nanoc...

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International SAMPE Conference and Exhibition 2020

作者： Tate, Jitendra S. Arigbabowo, Oluwasola K. Lepere, Micheal Okeke, Henry Garcia, Jesse Nahar, Aziza Materials Science Engineering and Commercialization Program Texas State University United States Ingram School of Engineering Texas State University United States Texas State University San MarcosTX78666 United States

Polyamide 6 (PA 6) nanocomposites are viable engineered nanocomposite materials with potential application in electrostatic discharge dissipation applications. Creating an electrically conductive path to dissipate electrostatic charges in such materials can be a viable solution to Electrostatic Discharge (ESD) concerns. The addition of nanofillers can also enhance mechanical properties of the parent polyamide 6, a structural thermoplastic ideal for 3D printing via fused deposition modelling (FDM). While improving the ESD capability, it is imperative to sustain the structural integrity of the nanocomposites. Hence, this study evaluated the mechanical, thermal and electrical properties of 3D printed PA6 Nanocomposites for electrostatic discharge applications. 3 and 5 wt.% of Carbon Nanofiber (CNF) was compounded with PA6 using co-rotating twin screw extruder) to produce 1.75mm diameter monofilaments for fused deposition modelling (FDM). The test samples were printed using commercial-off-the-shelf (COTS) 3D printer, Lulzbot TAZ 6 FDM printer. Mechanical, electrical and thermal characterization were carried out according to their respective ASTM standard. The tensile and flexural properties were enhanced by 3wt% addition of CNF, but no significant improvement was observed at 5wt%. The CNF nanocomposites exhibited good thermal stability and crystallization phenomenon at both loading levels. The volume resistivity of the PA6 matrix was reduced to order of 10 11 and 1012 by 3wt% and 5wt% CNF addition respectively, which seems promising for manufacturing static discharge products. © 2020 Soc. for the Advancement of Material and Process engineering. All rights reserved.

关键词： Carbon nanofibers

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Exotic physical properties in metallic perovskite LaRuO3: Strong evidence for Hund metal

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Physical Review B 2022年第8期106卷 L081104-L081104页

作者： Z. Y. Li X. Y. Li J. M. He Michael M. McGuire Adam A. Aczel J. A. Alonso M. T. Fernandez-Diaz J.-S. Zhou Materials Science and Engineering Program Department of Mechanical Engineering University of Texas at Austin Austin Texas 78712 USA Materials Science and Technology Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Neutron Scattering Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Instituto de Ciencia de Materiales de Madrid CSIC Cantoblanco E-28049 Madrid Spain Institut-Laue-Langevin (ILL) 156X F-38042 Grenoble Cedex 9 France

The Hund's coupling rule is of fundamental importance in atomic physics. It also plays a key role in the determination of physical properties in strongly correlated electron systems where the Fermi energy lies in multiple bands. We report a thorough investigation of a rarely studied 4d perovskite oxide LaRuO3 by a suite of measurements including transport, magnetization, specific heat, thermoelectric power, thermal conductivity, and neutron and x-ray diffraction. Our results are consistent with theoretical predictions, which makes LaRuO3 an exemplary Hund metal.

关键词： Electrical conductivity Magnetic susceptibility Spin-orbit coupling

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Guest editorial

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Journal of Applied Mechanics, Transactions ASME 2021年第3期88卷

作者： Ruimi, Annie Cohen, Noy Mechanical Engineering Program Texas A&M University at Qatar Doha23874 Qatar Department of Materials Science and Engineering Technion - Israel Institute of Technology Haifa3200003 Israel

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Spin scattering and Hall effects in monolayer Fe3GeTe2

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Physical Review B 2023年第13期108卷 134425-134425页

作者： Luyan Yu Jie-Xiang Yu Jiadong Zang Roger K. Lake Houlong Zhuang Gen Yin Department of Physics University of Texas at Austin Austin Texas 78712 USA Department of Physics University of Florida Gainesville Florida 32611 USA Department of Physics and Materials Science Program University of New Hampshire Durham New Hampshire 03824 USA Laboratory for Terahertz and Terascale Electronics (LATTE) Department of Electrical and Computer Engineering University of California at Riverside Riverside California 92521 USA Mechanical and Aerospace Engineering Arizona State University Tempe Arizona 85287 USA Department of Physics Georgetown University Washington DC 20057 USA

We theoretically show that the carrier transport in a monolayer Fe3GeTe2 experiences a transition between anomalous and spin Hall effects when the spin polarization of disorders switches between out-of-plane and in-plane. These Hall effects are allowed when the magnetization is polarized in-plane, breaking the C3 rotation symmetry. The transition originates from the selection rule of spin scattering, the strong spin-orbit coupling, and the van Hove singularities near the Fermi surface. The scattering selection rule tolerates the sign change of the disorder spin, which provides a convenient method to detect the switching of antiferromagnetic insulators regardless of the interfacial roughness in a heterostructure. This provides a convenient platform for the study of 2D spintronics through various van der Waals heterostructures.

关键词： Magnetotransport Spin Hall effect 2-dimensional systems Density functional calculations

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Conductive polymers for stretchable supercapacitors

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Nano Research 2019年第9期12卷 1978-1987页

作者： Yaqun Wang Yu Ding Xuelin Guo Guihua Yu Country College of Electrical Engineering and Automation Shandong University of Science and TechnologyQingdao 266590China Materials Science and Engineering Program and Department of Mechanical Engineering The University of Texas at AustinTX 78712USA

Stretchable energy storage devices,maintaining the capability of steady operation under large mechanical strain,have become increasing more important with the development of stretchable electronic *** supercapacitors(SSCs),with high power density,modest energy density,and superior mechanical properties are regarded as one of the most promising power supplies to stretchable electronic *** polymers,such as polyaniline(PANI),polypyrrole(PPy),polythiophene(PTh)and poly(3,4-ehtylenedioxythiophene)(PEDOT),are among the well-studied electroactive materials for the construction of SSCs because of their high specific theoretical capacity,excellent electrochemical activity,light weight,and high *** effort has been devoted to developing stretchable,conductive polymer-based SSCs with different device structures,such as sandwich-type and fiber-shaped type *** review summarizes the material and structural design for con ductive polymer-based SSCs and discusses the challenge and importa nt di recti ons in this emergi ng field.

关键词： conductive polymer stretchable supercapacitor pseudocapacitive energy storage

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Ultrafast THz nonlinear modulation in an electrically tunable graphene thin film perfect absorber 16

Ultrafast THz nonlinear modulation in an electrically tunabl...

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16th International Congress on Artificial materials for Novel Wave Phenomena, Metamaterials 2022

作者： Tasolamprou, A.C. Koulouklidis, A.D. Doukas, S. Kyriakou, E. Ergoktas, M.S. Daskalaki, C. Economou, E.N. Kocabas, C. Lidorikis, E. Kafesaki, M. Tzortzakis, S. Institute of Electronic Structure and Laser Foundation for Research and Technology Hellas N. Plastira 100 Crete Heraklion71110 Greece Department of Materials Science and Engineering University of Ioannina Ioannina45110 Greece Department of Materials Science and Technology University of Crete Heraklion70013 Greece Department of Materials University of Manchester ManchesterM13 9PL United Kingdom National Graphene Institute University of Manchester ManchesterM13 9PL United Kingdom Department of Physics University of Crete Heraklion70013 Greece Henry Royce Institute for Advanced Materials University of Manchester ManchesterM13 9PL United Kingdom Ioannina45110 Greece Science Program Texas A&M University at Qatar P.O. Box 23874 Doha Qatar

ISBN: (数字)9781665465847

ISBN: (纸本)9781665465847

We demonstrate an electrically tunable, ultrafast, nonlinear, terahertz absorption modulator operating at 2.3 THz. The device consists of a uniform graphene sheet placed on a Au-grounded ionic liquid substrate. An electrostatic gating applied between the graphene sheet and the back-plate controls the underlying conditions for the graphene while nonlinear modulation is assessed via self-action when the THz field strength increases from 145 to 654 kV/cm. The time-dependent thermodynamic response of the system during interaction with ultrafast electric fields is further supported via the theoretical analysis of the experimental findings. © 2022 IEEE.

关键词： Graphene

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aflow++: A C++ framework for autonomous materials design

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Computational materials science 2023年 217卷

作者： Oses, Corey Esters, Marco Hicks, David Divilov, Simon Eckert, Hagen Friedrich, Rico Mehl, Michael J. Smolyanyuk, Andriy Campilongo, Xiomara van de Walle, Axel Schroers, Jan Kusne, A. Gilad Takeuchi, Ichiro Zurek, Eva Nardelli, Marco Buongiorno Fornari, Marco Lederer, Yoav Levy, Ohad Toher, Cormac Curtarolo, Stefano Department of Mechanical Engineering and Materials Science Duke University DurhamNC27708 United States Center for Autonomous Materials Design Duke University DurhamNC27708 United States LIFT American Lightweight Materials Manufacturing Innovation Institute DetroitMI48216 United States Institute of Ion Beam Physics and Materials Research Helmholtz-Zentrum Dresden-Rossendorf Dresden01328 Germany Theoretical Chemistry Technische Universität Dresden Dresden01062 Germany Institute of Solid State Physics Technische Universität Wien WienA-1040 Austria School of Engineering Brown University ProvidenceRI02912 United States Department of Mechanical Engineering and Materials Science Yale University New HavenCT06511 United States Materials Measurement Science Division National Institute of Standards and Technology GaithersburgMD20899 United States Department of Materials Science and Engineering University of Maryland College Park MD20742 United States Department of Chemistry State University of New York at Buffalo BuffaloNY14260 United States Department of Physics and Department of Chemistry University of North Texas DentonTX76203 United States Santa Fe Institute Santa FeNM87501 United States Department of Physics and Science of Advanced Materials Program Central Michigan University Mount PleasantMI48859 United States Department of Physics NRCN Beer-Sheva84190 Israel Department of Materials Science and Engineering and Department of Chemistry and Biochemistry University of Texas at Dallas RichardsonTX75080 United States

The realization of novel technological opportunities given by computational and autonomous materials design requires efficient and effective frameworks. For more than two decades, aflow++ (Automatic-Flow Framework for materials Discovery) has provided an interconnected collection of algorithms and workflows to address this challenge. This article contains an overview of the software and some of its most heavily-used functionalities, including algorithmic details, standards, and examples. Key thrusts are highlighted: the calculation of structural, electronic, thermodynamic, and thermomechanical properties in addition to the modeling of complex materials, such as high-entropy ceramics and bulk metallic glasses. The aflow++ software prioritizes interoperability, minimizing the number of independent parameters and tolerances. It ensures consistency of results across property sets — facilitating machine learning studies. The software also features various validation schemes, offering real-time quality assurance for data generated in a high-throughput fashion. Altogether, these considerations contribute to the development of large and reliable materials databases that can ultimately deliver future materials systems. © 2022

关键词： Machine learning

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Assessment of effects of alumina nanofibers on wettability, viscosity, and mechanical properties of unsaturated polyester

Assessment of effects of alumina nanofibers on wettability, ...

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International SAMPE Conference and Exhibition 2020

作者： Kallagunta, Harish S. P. Panta, Subash Nahar, Aziza Tate, Jitendra S. Texas State University 601 University Drive San MarcosTX78666 United States Materials Science Engineering and Commercialization Program Texas State University United States Ingram School of Engineering Texas State University United States

Increase in viscosity, poor wettability and agglomeration are the major issues when using nanoparticles to enhance the properties of polymeric materials. Processability of composites becomes challenging with the increase in the viscosity. A study has been made on the effects of alumina nanofiber modification on the viscosity and mechanical strength of unsaturated polyester resin. Additionally, wettability studies of the alumina nanofiber with unsaturated polyester resin using contact angle measurements were compared. Tension, Flexure and Izod impact tests were performed on 0.25wt%, 0.5wt%, 0.75wt% and 1wt% loading levels of alumina nanofibers in unsaturated polyester matrix and were compared to neat composites. Alumina nanofibers were dispersed in unsaturated polyester resin using three roll mills. Nanomodified and neat polyester coupons were cast in silicon molds according to the standards. TEM Images revealed good dispersion. Silane treatment proved to improve the homogeneity in dispersion and positively affect the viscosity. In terms of mechanical properties, silane treatment proved to be effective at lower loading levels. However, at higher loading levels, silane treatment was outperformed by untreated alumina nanofibers. © 2020 Soc. for the Advancement of Material and Process engineering. All rights reserved.

关键词： Wetting

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Magnetically tuned continuous transition from weak to strong coupling in terahertz magnon polaritons

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Physical Review Research 2023年第1期5卷 L012039-L012039页

作者： Andrey Baydin Kenji Hayashida Takuma Makihara Fuyang Tay Xiaoxuan Ma Wei Ren Guohong Ma G. Timothy Noe, II Ikufumi Katayama Jun Takeda Hiroyuki Nojiri Shixun Cao Motoaki Bamba Junichiro Kono Department of Electrical and Computer Engineering Rice University Houston Texas 77005 USA Smalley-Curl Institute Rice University Houston Texas 77005 USA Division of Applied Physics Graduate School of Engineering Hokkaido University Sapporo Hokkaido 060-8628 Japan Department of Physics and Astronomy Rice University Houston Texas 77005 USA Applied Physics Graduate Program Smalley-Curl Institute Rice University Houston Texas 77005 USA Department of Physics International Center of Quantum and Molecular Structures and Materials Genome Institute Shanghai University 200444 Shanghai China Department of Physics Graduate School of Engineering Science Yokohama National University Yokohama 240-8501 Japan Institute for Materials Research Tohoku University Sendai 980-8577 Japan The Hakubi Center for Advanced Research Kyoto University Kyoto 606-8502 Japan Department of Physics I Kyoto University Kyoto 606-8502 Japan PRESTO Japan Science and Technology Agency Kawaguchi 332-0012 Japan Department of Materials Science and NanoEngineering Rice University Houston Texas 77005 USA

Depending on the relative rates of coupling and dissipation, a light-matter coupled system is either in the weak- or strong-coupling regime. Here, we present a unique system where the coupling rate continuously increases with an externally applied magnetic field while the dissipation rate remains constant, allowing us to monitor a weak-to-strong coupling transition as a function of magnetic field. We observed a Rabi splitting of a terahertz magnon mode in yttrium orthoferrite above a threshold magnetic field of ∼14 T. Based on a microscopic theoretical model, we show that with increasing magnetic field the magnons transition into magnon polaritons through an exceptional point, which will open up new opportunities for in situ control of non-Hermitian systems.

关键词： Antiferromagnetism High magnetic fields Magneto-optics Magnons Polaritons Non-Hermitean systems Terahertz time-domain spectroscopy Transfer matrix method

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