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Growth of magnetic metals on carbon microspheres with synergetic dissipation abilities to broaden microwave absorption

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Journal of materials science & Technology 2022年第12期107卷 100-110页

作者： Biao Zhao Yang Li Qingwen Zeng Bingbing Fan Lei Wang Rui Zhang Renchao Che Laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative MaterialsFudan UniversityShanghai 200438China Department of Materials Science Fudan UniversityShanghai 200438China Henan Key Laboratory of Aeronautical Materials and Application Technology School of Material Science and EngineeringZhengzhou University of AeronauticsZhengzhouHenan 450046China School of Material Science and Engineering Zhengzhou UniversityZhengzhouHenan 450001China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China

Microwave absorption(MA) materials have been captured extensive attentions due to the serious electromagnetic(EM) pollution. Numerous interests focus on the MA performances of core-shell structural composites with magnetic constituents as cores and dielectric constituents as shells, which inevitably suppressed the magnetic coupling causing the decrease of magnetic loss to some extent. Herein, the coreshell structural carbon(C) microsphere/magnetic metal composites were fabricated through the combination of an electrostatic assembly approach and subsequent in-situ reduction reaction. The complex permittivity and permeability of core-shell C@magnetic metal composite system can be effective adjusted by the constituent and microstructure of shells. Thanks to the distinct magnetic coupling from the subtle designed structures and the promotion of the magnetic-dielectric synergy, the C@magnetic metal composite exhibited enhanced MA properties. The optimal reflection loss(RL) of C@Ni composite was-54.1 dB with a thickness of 3.4 mm, meanwhile the effective absorbing band could reach over 5.5 GHz at only a1.8 mm thickness. Broad absorption bandwidth with RL below-10 d B could achieve 6.0 GHz and 6.7 GHz for C@Co and C@Ni Co composites with a thin 2.1 mm thickness, respectively. Our exciting findings might lead a guide on the novel structure design for the functional core-shell structural composites used for microwave absorption.

关键词： Microwave absorption Core-shell structure C@magnetic metal composite Interfacial polarization Magnetic coupling

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Biomass as an alternative solution to energy production and reduction of the greenhouse gas emissions: a review

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International Journal of Power and Energy Conversion 2025年第1期16卷 78-99页

作者： Abouallal, Hafida El Idrissi, Ayoub Najah Dkhireche, Nadia Touhami, Mohammed Ebn Laboratory of Advanced Material Engineering Process Department of Chemistry Faculty of Sciences Ibn Tofail University University Campus P.O. Box 242 Kenitra Morocco Advanced Systems – Engineering Laboratory National School of Applied Science Ibn Tofail University University Campus P.O. Box 242 Kenitra Morocco

The increase in population and the expansion of transportation, agriculture, and industry drive the need for energy, leading to a reliance on fossil fuels as the primary energy source. This reliance results in heightened greenhouse gas emissions and environmental damage. To address this, efforts have been made to harness the diverse range of available biomass for energy production, including gas, heat, and electricity through various conversion methods. This article explores the global availability of biomass for energy production, current energy consumption and production trends, biomass classifications and sources, conversion techniques, challenges hindering biomass implementation, and the potential of biomass as an alternative energy source alongside wind, geothermal, and hydroelectric power to eventually replace fossil fuels. The analysis indicates that biomass holds promise for energy generation and can complement other renewable resources in transitioning away from fossil fuels. Copyright © 2025 Inderscience Enterprises Ltd.

关键词： Greenhouse gas emissions

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Substantial thermoelectric enhancement achieved by manipulating the band structure and dislocations in Ag and La co-doped SnTe

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Journal of Advanced Ceramics 2021年第4期10卷 860-870页

作者： Wenjing XU Zhongwei ZHANG Chengyan LIU Jie GAO Zhenyuan YE Chunguang CHEN Ying PENG Xiaobo BAI Lei MIAO Guangxi Key Laboratory of Information Material Guangxi Collaborative Innovation Center of Structure and Property for New Energy and MaterialsSchool of Material Science and EngineeringGuilin University of Electronic TechnologyGuilin 541004China Department of Materials Science and Engineering SIT Research LaboratoriesInnovative Global ProgramFaculty of EngineeringShibaura Institute of TechnologyTokyo 135-8548Japan

Eco-friendly SnTe based thermoelectric materials are intensively studied recently as candidates to replace PbTe;yet the thermoelectric performance of SnTe is suppressed by its intrinsically high carrier concentration and high thermal *** this work,we confirm that the Ag and La co-doping can be applied to simultaneously enhance the power factor and reduce the thermal conductivity,contributing to a final promotion of figure of *** one hand,the carrier concentration and band offset between valence bands are concurrently reduced,promoting the power factor to a highest value of-2436μW·m^(-1)·K^(-2) at 873 *** the other hand,lots of dislocations(~3.16×10^(7)mm^(-2))associated with impurity precipitates are generated,resulting in the decline of thermal conductivity to a minimum value of 1.87 W·m^(-1)·K^(-1) at 873 *** a result,a substantial thermoelectric performance enhancement up to zT≈1.0 at 873 K is obtained for the sample Sn0.94Ag0.09La0.05Te,which is twice that of the pristine SnTe(zT≈0.49 at 873 K).This strategy of synergistic manipulation of electronic band and microstructures via introducing rare earth elements could be applied to other systems to improve thermoelectric performance.

关键词： SnTe band convergence dislocation Ag and La co-doping thermoelectric performance

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Investigation of manufacturing conditions of single roll rapidly solidified ribbon for anode materials of magnesium rechargeable batteries

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Keikinzoku/Journal of Japan Institute of Light Metals 2023年第11期73卷 537-544页

作者： Kirimoto, Yuichi Fuke, Kousuke Tsukeda, Tadayoshi Aida, Tetsuo Nemoto, Yasunori Ikeda, Minoru Tabata, Hironobu Kurihara, Hideki Suzuki, Mayumi Department of Nano and Functional Material Science Graduate School of Science and Engineering for Education University of Toyama 3190 Gofuku Toyama-shi-shiToyama Toyama930-8555 Japan Program of Materials Science and Engineering Studies in Science and Engineering Graduate School of Science and Engineering University of Toyama Toyama-shi-shiToyama Toyama Japan Faculty of Sustainable Design Academic Assembly University of Toyama Toyama-shi Toyama-shi-shiToyama Toyama Japan FLOW Science JAPAN Shizuoka Hamamatsu-shi Japan CHUETSU METAL WORKS CO. LTD Nakaniikawa-gun Toyama Japan Saitama Industrial Technology Center Saitama Kawaguchi-shi Japan Department of Mechanical Systems Engineering Faculty of Engineering Toyama Prefectural University Imizu-shi Toyama Japan

Magnesium rechargeable batteries are attracting attention as next-generation rechargeable batteries because of their resource abundance, cost, safety, and high electrical capacity per volume compared to conventional lithium-ion rechargeable batteries. Our joint research team focused not only on the electrochemically active magnesium composition of ribbon for the negative electrode materials of magnesium rechargeable batteries but also on the production process, focused on the single roll type liquid quenching and rapid solidification method, which can be produced at a lower cost. In this study, the optimal processing conditions were examined by comparing CAE analysis with ribbon actually manufactured, with the aim of further improving manufacturing conditions using the same method, such as length discontinuities, thickness, and surface properties of ribbon. We specifically various process parameters such as injection pressure and roll peripheral speed for evaluation. As a result, several linear cracks were observed on the surface of the ribbon as the peripheral speed increased and as the Gap became wider, and the surface properties tended to deteriorate. Also, It was found that the dominant factor in the length of the ribbon was the peripheral speed. As the peripheral speed increased, the length of the ribbon tended to increase. © 2023 Japan Institute of Light Metals. All rights reserved.

关键词： Surface properties

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Computational Modeling for Cr and S Poisoning Pathways on La0.6Sr0.4Co0.2Fe0.8O3 Surfaces

Computational Modeling for Cr and S Poisoning Pathways on La...

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243rd ECS Meeting

作者： Liu, B. Yildiz, B. Department of Material Science and Engineering Massachusetts Institute of Technology CambridgeMA02139 United States Department of Nuclear Science and Engineering Massachusetts Institute of Technology CambridgeMA02139 United States

ISBN: (纸本)9781607685395

Solid oxide fuel cells (SOFCs) are highly efficient devices for energy conversion. However, their performance is hindered by the poisoning of their oxygen electrode materials by chromium and sulfur species. While previous studies have proposed a nucleation theory of Cr and S poisoning as a mechanism, little is known about the adsorption behaviors and compound formation steps during the poisoning process. This knowledge is critical for understanding the poisoning mechanisms and developing effective mitigation strategies. In this study, the state-of-the-art SOFC oxygen electrode material, La0.6Sr0.4Co0.2Fe0.8O3 (LSCF), is used as a modeling system. A realistic surface structure will be constructed by grand canonical Monte Carlo (GCMC) simulation. Then, the adsorption energies as a function of surface chemistry will be calculated using density functional theory (DFT). The results revealed the importance of surface chemistry in determining the energetics and kinetics of precursor adsorption and compound formation. © The Electrochemical Society.

关键词： Density functional theory

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“Wood-nacre”:Development of a Bio-inspired Wood-Based Composite for Beam and 3D-Surface Elements with Improved Failure Mechanisms

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Journal of Bionic engineering 2023年第4期20卷 1701-1711页

作者： Ulrich Müller Peter Halbauer Alexander Stadlmann Maximilian Grabner Hajir Al-musawi Bernhard Ungerer Maximilian Pramreiter Department of Material Science and Process Engineering Institute of Wood Technology and Renewable MaterialsUniversity of Natural Resources and Life SciencesKonrad-Lorenz-Straße 243430Tulln an der DonauAustria Hycobility Engineering&Technologies GmbH Stadiongasse 6-8/Top281010ViennaAustria

Following the natural structure of the nacre,the material studied consists of a multitude of hexagonal tiles that are glued together in an offset manner with a ductile *** so-called“wood nacre”consists of macroscopic tiles of birch wood veneer with a thickness of 0.8 mm and a size of 20 or 10 mm in diameter in order to mimic the aragonite tiles and the ductile PUR-adhesive corresponds to the layers of collagen in between.E-modulus(MOE),bending strength(MOR)and impact bending strength of the samples were determined and compared with reference samples of birch laminated *** hierarchical layered structure of the tiles does not cause any relevant loss in *** nacre,“wood nacre”also shows tough fracture behaviour and a high homogenization ***,strain hardening and high fracture toughness of the natural model could not be fully *** reason for this is the insufficient ratio between the strength and stiffness of the veneer layers and the *** adjusting the size of the tiles,increasing the strength and surface roughness of the veneers,*** densification,and using more ductile adhesives that can be applied in smaller layer thicknesses,it should be possible to better reproduce the natural ratios of nacre and thus achieve a significant improvement in the material properties of“wood nacre”.In addition to the mechanical properties,the high potential of the new material lies in the possibility of producing 3D shell-shaped elements for lightweight wood hybrid construction.

关键词： Bio-inspired Damage tolerance Failure behaviour Hierarchical structure Nacre Work of fracture

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Corrosion behavior of AlCrVTi light-weight high-entropy alloy coating in different corrosion environments

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Surface science and Technology 2023年第1期1卷 311-318页

作者： Bowei Xing Sainan Nie Bingqian Jin Xiaojiao Zuo Huishu Yu Xin Wang Xu Zhang Nannan Zhang Department of Material Science and Engineering Shenyang University of TechnologyShenyang 110870China

The excellent corrosion resistance of high-entropy alloys(HEAs)has attracted widespread attention in recent *** focus of research is gradually shifting from the performance characterization to the composition design and application that balance multiple *** this study,the AlCrVTi light-weight HEA has been chosen to investigate the corrosion behavior in the electrochemical and salt spray *** results show that HEA coating prepared by plasma spray followed laser re-melting present a homogeneous single-phase *** active Ti and V elements promote the formation of passive film during corrosion,which improves the corrosion resistance of HEA ***,the HEA presents a higher corrosion resistance compared with 304 stainless steel(SS304),which is reflected in the lower corrosion current *** the salt spray environment,the coating still presents the pitting corrosion,which is same as in the electrochemical *** is demonstrated that the AlCrVTi HEA has the potential that balancing the corrosion resistance and mechanical properties.

关键词： AlCrVTi high-entropy alloy Plasma spray Laser re-melting Corrosion resistance Salt spray corrosion

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Stable Cycling of All-Solid-State Lithium Metal Batteries Enabled by Salt engineering of PEO-Based Polymer Electrolytes

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Energy & Environmental materials 2024年第2期7卷 67-74页

作者： Lujuan Liu Tong Wang Li Sun Tinglu Song Hao Yan Chunli Li Daobin Mu Jincheng Zheng Yang Dai Department of Chemical Engineering Shanghai UniversityShangda Road 99Shanghai 200444China School of Material Science&Engineering Beijing Key Laboratory of Environmental Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Department of Physics Xiamen UniversityXiamen 361005China

Poly(ethylene oxide)(PEO)-based polymer electrolytes show the prospect in all-solid-state lithium metal batteries;however,they present limitations of low room-temperature ionic conductivity,and interfacial incompatibility with high voltage ***,a salt engineering of 1,1,2,2,3,3-hexafluoropropane-1,3-disulfonimide lithium salt(LiHFDF)/LiTFSI system was developed in PEO-based electrolyte,demonstrating to effectively regulate Li ion transport and improve the interfacial stability under high *** show,by manipulating the interaction between PEO matrix and TFSI^(-)-HFDF^(-),the optimized solid-state polymer electrolyte achieves maximum Li+conduction of 1.24×10^(-4)S cm^(-1)at 40℃,which is almost 3 times of the ***,the optimized polymer electrolyte demonstrates outstanding stable cycling in the LiFePO_(4)/Li and LiNi_(0.8)Mn_(0.1)Co_(0.1)O_(2)/Li(3.0-4.4 V,200 cycles)based all-solid-state lithium batteries at 40℃.

关键词： all-solid-state battery high voltage li-ion conductivity molecular interaction poly(ethylene oxide)

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Experimental and numerical behavior of strengthened reinforced concrete slabs

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Journal of engineering and Applied science 2025年第1期72卷 1-21页

作者： Hamdy, Abdelrhman Emad Abdalla, Hany Ahmed Abdelhamed, Ghada Diaa Elansary, Ahmed Alaa Lecturer Assistant Faculty of Engineering Ahram Canadian University Giza12451 Egypt Department of Structural Engineering Faculty of Engineering Cairo University Giza12613 Egypt Housing and Building National Research Center Giza12622 Egypt Department of Civil Engineering Faculty of Engineering and Material Science German University in Cairo New Cairo City11835 Egypt Department of Civil and Environmental Engineering The University of Western Ontario LondonONN6A3K7 Canada

In terms of the importance of establishing mega structures in Egypt, there is an increasing demand to strengthen their slabs. Accordingly, this research was initiated with the objective of assessing different strengthening techniques (strengthening by concrete jacket or strips of carbon fiber reinforced polymer "CFRP"), where a multi-disciplinary approach was employed. Principally, literature within the domain of slab strengthening was amassed and scrutinized. An experimental work was conducted to examine 5 specimens of slabs under 4-point loadings. Crack patterns, midspan deflections, and steel strains were designated, where load–deflection curves and load-strain curves were produced. Moreover, the experimental investigation was replicated numerically by ABAQUS. Experimental and numerical results were contrasted, from which it was apparent that their results provided comparable trends. Confident with this contrasting process, a parametric study was achieved by ABAQUS, where 54 specimens with various parameters were investigated. Results showed that strengthening with RC jacketing and CFRP strips enhanced the load capacity and initial stiffness while decreasing the ductility for RC slabs. In addition, various jacketing bar and CFRP properties changes showed significant enhancement in the behavior of strengthened slabs. The numerical results showed enhancement in the load capacity of strengthened specimens due to the increase in the jacketing yield strength, bar diameter, and the jacketing concrete compressive strength. Increasing the number of CFRP strips enhanced the performance of the strengthened slab specimens by 14.2% ~ 25.1%. © The Author(s) 2025.

关键词： Concrete slabs

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Aiming at magnesium metal production using domestic resource in Japan

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Keikinzoku/Journal of Japan Institute of Light Metals 2024年第10期74卷 463-470页

作者： Takenaka, Toshihide Ohara, Hisashi Hoshino, Takeo Chino, Yasumasa Matsumoto, Toshiharu Inoue, Makoto Faculty of Chemistry Materials and Bioengineering Kansai University 3-3-35 Yamate-cho Osaka Suita-shi564-8680 Japan The Japan Magnesium Association Chuou-ku Tokyo Japan Department of Material Engineering Graduate of Engineering The University of Tokyo Bunkyo-ku Tokyo Japan Department of Material and Chemistry National Institute of Advanced Industrial Science and Technology Ibaraki Tsukuba-shi Japan Tobata Seisakusho Co. Ltd. Kitakyushu-shi Fukuoka Japan Department of Mechanical Engineering National Institute of Technology Toyama College Toyamashi Toyama Japan

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