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SSRN 2023年

作者： Zhang, Yu-Xing Xie, She-Juan Guo, Wei Ding, Jun Poh, Leong Hien Sha, Zhen-Dong State Key Laboratory for Strength and Vibration of Mechanical Structures School of Aerospace Engineering Xi'an Jiaotong University Xi'An710049 China China Electronics Technology Group Corporation 52nd Research Institute Hang’zhou310000 China State Key Lab of Materials Processing and Die & Mould Technology Huazhong University of Science and Technology 1037 Luoyu Road Wuhan430074 China Center for Alloy Innovation and Design State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong University Xi'An710049 China Department of Civil and Environmental Engineering National University of Singapore 1 Engineering Drive 2 E1A-07–03 Singapore117576 Singapore International Center for Applied Mechanics China

Fe-based metallic glasses (MGs) are a class of promising soft magnetic materials that have received great attention in transformer industries. However, their limited glass-forming ability and poor plasticity severely hinder the development of new high-performance Fe-based MGs. Inspired by the significant development in machine learning (ML) technology, we herein propose a multi-objective optimization strategy to search for Fe-based MGs with optimal combinations of critical casting size (Dmax), saturation magnetization (Bs), and plasticity. The objective functions are built in combination with neural network (NN) models for predicting Dmax and Bs, as well as empirical formula for plasticity. The effect of number of hidden layers is investigated and the dropout regularization method employed to improve the prediction performance. Our results show that the predictions of Bs and Dmax by using alloy composition as the sole input perform well, as evidenced by their r2 values of 0.963 and 0.874, respectively. Multi-objective optimization based on the genetic algorithm is executed to obtain the Pareto front and Pareto-optimal solutions. The Pareto-optimal alloys predicted for the Fe83C1B x Si y P16- x-y and Fe x Co y Ni72 -x-y B19.2Si4.8Nb4 systems are in good agreement with those reported in experiments. This work thus showcases potential applications for the design of high-performance Fe-MGs against conflicting objectives. © 2023, The Authors. All rights reserved.

关键词： Saturation magnetization

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Magnetically Tuned Continuous Transition from Weak to Strong Coupling in Terahertz Magnon Polaritons

arXiv

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arXiv 2022年

作者： Baydin, Andrey Hayashida, Kenji Makihara, Takuma Tay, Fuyang Ma, Xiaoxuan Ren, Wei Ma, Guohong Noe, G. Timothy Katayama, Ikufumi Takeda, Jun Nojiri, Hiroyuki Cao, Shixun Bamba, Motoaki Kono, Junichiro Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States The Smalley-Curl Institute Rice University HoustonTX77005 United States Division of Applied Physics Graduate School of Engineering Hokkaido University Hokkaido Sapporo060-8628 Japan Department of Physics and Astronomy Rice University HoustonTX77005 United States Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX77005 United States Department of Physics International Center of Quantum and Molecular Structures Materials Genome Institute Shanghai University Shanghai200444 China Department of Physics Graduate School of Engineering Science Yokohama National University Yokohama240-8501 Japan Institute for Materials Research Tohoku University Sendai980-8577 Japan The Hakubi Center for Advanced Research Kyoto University Kyoto606-8502 Japan Department of Physics I Kyoto University Kyoto606-8502 Japan PRESTO Japan Science and Technology Agency Kawaguchi332-0012 Japan Department of Materials Science and NanoEngineering Rice University HoustonTX77005 United States

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. Copyright © 2022, The Authors. All rights reserved.

关键词： Polariton

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Giant Deep-Ultraviolet Circular Dichroism in Synthetic Architectures of Ordered Carbon Nanotubes

Giant Deep-Ultraviolet Circular Dichroism in Synthetic Archi...

引用

Conference on Lasers and Electro-Optics (CLEO)

作者： Jacques Doumani Minhan Lou Oliver Dewey Nina Hong Jichao Fan Andrey Baydin Matteo Pasquali Yohei Yomogida Kazuhiro Yanagi Riichiro Saito Junichiro Kono Weilu Gao Department of Electrical and Computer Engineering Rice University Houston TX USA Applied Physics Graduate Program Smalley-Curl Institute Rice University Houston TX USA Department of Electrical and Computer Engineering The University of Utah Salt Lake City UT USA Carbon Hub Rice University Houston TX USA Department of Chemical and Biomolecular Engineering Rice University Houston TX USA J.A. Woollam Co. Lincoln NE USA The Smalley-Curl Institute Rice University Houston TX USA Department of Chemistry Rice University Houston TX USA Department of Materials Science and NanoEngineering Rice University Houston TX USA Department of Physics and Astronomy Tokyo Metropolitan University Tokyo Japan Department Physics Tohoku University Sendai Japan Department Physics and Astronomy Rice University Houston TX USA

We demonstrate tunable, giant, and structure-induced deep-ultraviolet circular dichroism in macroscopically chiral assemblies of racemic carbon nanotubes prepared using two approaches: mechanical-rotation-assisted vac... 详细信息

ISBN: (纸本)9781957171258

关键词： Carbon nanotubes Chiral media Dichroism Graphene Optical activity Quantum information

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Very high-cycle fatigue characteristics of cross-ply CFRP laminates in transverse crack initiation 30th

Very high-cycle fatigue characteristics of cross-ply CFRP la...

引用

30th Symposium of the International Committee on Aeronautical Fatigue, ICAF 2019

作者： Hosoi, Atsushi Suzuki, Takuro Kosugi, Kensuke Atsumi, Takeru Shimamura, Yoshinobu Tsuda, Terumasa Kawada, Hiroyuki Department of Applied Mechanics and Aerospace Engineering Waseda University 3-4-1 Okubo Shinjuku-Ku Tokyo169-8555 Japan Department of Materials Science Waseda University 3-4-1 Okubo Shinjuku-Ku Tokyo169-8555 Japan Kagami Memorial Research Institute for Materials Science and Technology Waseda University 2-8-26 Nishiwaseda Shinjuku-Ku Tokyo169-0051 Japan Department of Applied Mechanics Waseda University 3-4-1 Okubo Shinjuku-Ku Tokyo169-8555 Japan Department of Mechanical Engineering Shizuoka University 3-5-1 Johoku Naka-Ku Hamamatsu-Shi Sizuoka432-8561 Japan Composite Materials Research Laboratories Toray Industries Inc 1515 Tsutsui Masaki-Cho Iyo-Gun Ehime791-3193 Japan

ISBN: (纸本)9783030215026

Fan blades are subjected to very high-cycle loadings during the design life, so it is essential to evaluate the giga-cycle fatigue characteristics of carbon fiber reinforced plastic (CFRP) laminates. In this study, the transverse crack initiation of the cross-ply CFRP laminates in very high-cycle fatigue region was evaluated using an ultrasonic fatigue testing machine. The fatigue tests were conducted at the frequency of f = 20 kHz and the stress ratio of R = −1. In order to suppress temperature rise of the specimen, the intermittent operation with the loading time of 200 ms and the dwelling time of 2000 ms was adopted. The fatigue life data to transverse crack initiation in very high-cycle fatigue region was compared with the data of the fatigue test which was conducted at the frequency of f = 5 Hz and the stress ratios of R = 0.1 and −1 using a hydraulic control fatigue test machine. It was evaluated considering the influences of the stress ratio and the thermal residual stress by using the modified Walker model. The fatigue life to the transverse crack initiation of the cross-ply CFRP laminates in the very high-cycle region exceeding 108 cycles was on the extension of the test data in the low cycle region. © Springer Nature Switzerland AG 2020.

关键词： CFRP Giga-cycle fatigue Transverse crack Ultrasonic

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Transition mechanism of melt depth during Laser Powder Bed Fusion using in-situ X-ray and thermal imaging

Research Square

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Research Square 2021年

作者： Ogura, Tomoya Wakai, Yuki Nakano, Shizuka Sato, Naoko Kajino, Satoshi Suzuki, Shinsuke Department of Applied Mechanics and Aerospace Engineering Faculty of Science and Engineering Waseda University Nishiwaseda Campus 3-4-1 Okubo Shinjuku Tokyo169-8555 Japan 1-2-1 Namiki Ibaraki Tsukuba305-8564 Japan Henry Monitor Inc. 942-2 Shiga Nagano Suwa392-0012 Japan Kagami Memorial Research Institute of Materials Science and Technology Waseda University 2-8-16 Shinjuku Tokyo169-0051 Japan Department of Materials Science Faculty of Science and Engineering Waseda University 3-4-1 Okubo Shinjuku Tokyo169-8555 Japan

This research clarified the transition mechanism of melt depth in Ti powder bed during Laser Powder Bed Fusion process using in-situ X-ray and thermal imaging. A fiber laser beam of 150 W was irradiated on a powder bed at a scan speed of 15 mm/s for 3.5 s in a vacuum chamber. The obtained X-ray images showed a keyhole depth Ld increased immediately after laser irradiation, gradually decreased, and became constant. It also showed a keyhole width Lw increased immediately after laser irradiation and decreased afterward, after that, Lw increased again, and became constant. Furthermore, thermal images that measured the temperature on the powder bed showed the high temperature width Lh gradually increased and become constant. The model of the driving force which pushed the molten droplet was examined by analyzing the volume and scattering speed of the molten droplet. The model indicated the recoil pressure caused by the vaporization of powder metal was a driving force for the molten droplet scattering. The transition mechanism of keyhole depth was considered as follows. The increase of Ld at the beginning is due to the increase of the recoil pressure PT. This is because the decrease of Lw and large quantity of vaporization. Next, the decrease of Ld is due to the decrease in PT. This is because the increase of Lw and decrease of quantity of vaporization. At last, the transition to the constant Ld is caused by stabilization of Lw and Lh followed by stabilization of PT © 2021, CC BY.

关键词： Infrared imaging

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Unconventional Lattice Reconstruction in Twisted Multilayer CrI3

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Microscopy and Microanalysis 2024年第SUPPLEMENT_1期30卷

作者： Agarwal, Nishkarsh Sung, Suk Hyun Sun, Zeliang Zhao, Liuyan Hovden, Robert Department of Materials Science and Engineering University of Michigan Ann Arbor MI USA The Rowland Institute at Harvard Harvard University MA USA Department of Physics University of Michigan Ann Arbor MI USA Applied Physics Program University of Michigan Ann Arbor MI USA

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Emergence of Non-photoresponsive Catalytic Techniques for Environmental Remediation and Energy Generation

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Chemistry - An Asian Journal 2023年第9期18卷 e202300090页

作者： Kumar Sharma, Manish Khan, Imran Kaswan, Kuldeep Roy Barman, Snigdha Saha, Subhajit Hsieh, Wu-Chiao Chueh, Yu-Lun Wang, Yu-Lin Lee, Sangmin Choi, Dukhyun Lin, Zong-Hong Department of Materials Science and Engineering National Tsing Hua University Hsinchu30013 Taiwan Institute of NanoEngineering and Microsystems National Tsing Hua University Hsinchu30013 Taiwan International Intercollegiate PhD Program National Tsing Hua University Hsinchu30013 Taiwan Department of Renewable Energy Maulana Abul Kalam Azad University of Technology West Bengal741249 India Department of Obstetrics and Gynecology Chang Gung Memorial Hospital and College of Medicine Chang Gung University Taoyuan333 Taiwan Frontier Research Center on Fundamental and Applied Sciences of Matters National Tsing Hua University Hsinchu30013 Taiwan School of Mechanical Engineering Chung-Ang University Seoul06974 Korea Republic of Department of Mechanical Engineering Sungkyunkwan University Suwon16419 Korea Republic of Department of Biomedical Engineering National Taiwan University Taipei10617 Taiwan

Catalysis plays a crucial role in all the major applications and challenges in the environment, including energy generation and environmental remediation. Although photocatalysts and electrocatalysts are useful in addressing energy and environmental issues, they have some major drawbacks, such as low efficiency and easy charge recombination which limits their applications. Hence, it is imperative to design and explore new catalytic techniques that include non-photoresponsive catalysts. In this review, the detailed possibilities, characteristics and prospects of non-photoresponsive catalysts, such as piezocatalysts, thermocatalysts, pyrocatalysts, and tribocatalysts along with hybrid catalysts are described. The overall mechanism of each catalytic technique and its applications in different fields such as energy generation, environmental remediation, and carbon dioxide reduction are discussed. © 2023 Wiley-VCH GmbH.

关键词： Electrocatalysts

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Hard and soft materials: Putting consistent van der Waals density functionals to work

arXiv

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arXiv 2021年

作者： Frostenson, Carl M. Granhed, Erik Jedvik Shukla, Vivekanand Olsson, Pär A.T. Schröder, Elsebeth Hyldgaard, Per Department of Microtechnology and Nanoscience - MC2 Chalmers University of Technology GothenburgSE-41296 Sweden Department of Materials Science and Engineering KTH Royal Institute of Technology StockholmSE-10044 Sweden Department of Physics Chalmers University of Technology GothenburgSE-41296 Sweden Materials Science and Applied Mathematics Malmö University MalmöSE-205 06 Sweden Division of Mechanics Lund University Box 118 LundSE-221 00 Sweden

We present the idea and illustrate potential benefits of having a tool chain of closely related regular, unscreened and screened hybrid exchange-correlation (XC) functionals, all within the consistent formulation of the van der Waals density functional (vdW-DF) method [JPCM 32, 393001 (2020)]. Use of this chain of nonempirical XC functionals allows us to map when the inclusion of truly nonlocal exchange and of truly nonlocal correlation is important. Here we begin the mapping by addressing hard and soft material challenges: magnetic elements, perovskites, and biomolecular problems. We also predict the structure and polarization for a ferroelectric polymer. To facilitate this work and future broader explorations, we furthermore present a stress formulation for spin vdW-DF and illustrate use of a simple stability-modeling scheme to assert when the prediction of a soft mode (an imaginary-frequency vibrational mode, ubiquitous in perovskites and soft matter) implies a prediction of an actual low-temperature transformation. Copyright © 2021, The Authors. All rights reserved.

关键词： Van der Waals forces

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Outcoupling Hyperbolic Modes from Aligned Carbon Nanotube Films

Outcoupling Hyperbolic Modes from Aligned Carbon Nanotube Fi...

引用

Conference on Lasers and Electro-Optics (CLEO)

作者： Bryant Jerome Ciril S. Prasad Jacques Doumani Oliver S. Dewey Andrey Baydin Matteo Pasquali Junichiro Kono Weilu Gao Alessandro Alabastri Gururaj V. Naik Department of Electrical and Computer Engineering Rice University Houston TX USA Applied Physics Graduate Program Smalley-Curl Institute Rice University Houston TX USA Department of Chemical and Biomolecular Engineering Rice University Houston TX USA Smalley-Curl Institute Rice University Houston TX USA Department of Chemistry Rice University Houston TX USA Department of Materials Science and NanoEngineering Rice University Houston TX USA Department of Physics and Astronomy Rice University Houston TX USA Department of Electrical and Computer Engineering University of Utah Salt Lake City UT USA

Aligned carbon nanotube films make an excellent hyperbolic material plat-form in the infrared. Here, we experimentally demonstrate the presence of high-k modes in aligned carbon nanotube films and outcouple them to fr... 详细信息

ISBN: (数字)9781957171050

ISBN: (纸本)9781665466660

关键词： Films Carbon nanotubes Lasers and electrooptics Laser modes High-k dielectric materials Gratings Laser applications

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Damage mechanisms and mechanical properties of directly bonded CFRTP and aluminium with nano-structured surface 30th

Damage mechanisms and mechanical properties of directly bond...

引用

30th Symposium of the International Committee on Aeronautical Fatigue, ICAF 2019

作者： Jespersen, Kristine Munk Abe, Hikaru Ota, Hiroki Saito, Kei Wada, Keita Hosoi, Atsushi Kawada, Hiroyuki 3-2-1 Sakado Takatsu-ku Kawasaki-shiKanagawa213-0012 Japan Department of Applied Mechanics and Aerospace Engineering Waseda University 3-4-1 Okubo Shinjuku-ku Tokyo169-8555 Japan Department of Materials Science Waseda University 3-4-1 Okubo Shinjuku-ku Tokyo169-8555 Japan Kagami Memorial Research Institute for Materials Science and Technology 2-8-26 Nishiwaseda Shinjuku-ku Tokyo169-0051 Japan

ISBN: (纸本)9783030215026

The present work studies the cohesive behaviour of a previously proposed novel direct bonding method for dissimilar bonding between a carbon fibre reinforced thermoplastic (CFRTP) and aluminium. A nanostructure is manufactured on the aluminium surface and is directly bonded to the CFRTP by applying heat and pressure. Double cantilever beam (DCB) testing is carried out to evaluate the bonding properties and the initial results of a method for directly measuring the traction-separation behaviour from experiments is presented. The nanostructure is observed to improve the bonding properties significantly compared to two other considered bonding cases. Furthermore, the measured traction-separation behaviour is seen to be difference for each case. Nevertheless, the applied calculation method shows some challenges related to thermal stresses and plastic deformation that should to be taken into account in future studies. © Springer Nature Switzerland AG 2020.

关键词： Cohesive behaviour Direct bonding Dissimilar bonding Fibre reinforced thermoplastics Traction-separation law

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