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Construction of hydrangea-like core-shell SiO_(2)@Ti_(3)C_(2)T_(x)@CoNi microspheres for tunable electromagnetic wave absorbers

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Journal of Advanced Ceramics 2023年第4期12卷 711-723页

作者： Huanhuan Niu Xuewen Jiang Yongde Xia Hailong Wang Rui Zhang Hongxia Li Bingbing Fan Yanchun Zhoua School of Material Science&Engineering Zhengzhou UniversityZhengzhou 450001China Department of Engineering University of ExeterExeter EX44SBUK School of Materials Science and Engineering Luoyang Institute of Science and TechnologyLuoyang 471023China Sinostel Luoyang Institute of Refractories Research Co. Ltd.Luoyang 471039China

Ti_(3)C_(2)T_(x)MXene shows great potential in the application as microwave absorbers due to its high attenuation ***,excessively high permittivity and self-stacking are the main obstacles that constrain its wide range of *** tackle these problems,herein,the microspheres of SiO_(2)@Ti_(3)C_(2)T_(x)@CoNi with the hydrangea-like core-shell structure were designed and prepared by a combinatorial electrostatic assembly and hydrothermal reaction *** microspheres are constructed by an outside layer of CoNi nanosheets and intermediate Ti_(3)C_(2)T_(x)MXene nanosheets wrapping on the core of modified SiO_(2),engendering both homogenous and heterogeneous *** trilayer SiO_(2)@Ti_(3)C_(2)T_(x)@CoNi microspheres are“magnetic microsize supercapacitors”that can not only induce dielectric loss and magnetic loss but also provide multilayer interfaces to enhance the interfacial *** optimized impedance matching and core-shell structure could boost the reflection loss(RL)by electromagnetic *** synthesized SiO_(2)@Ti_(3)C_(2)T_(x)@CoNi microspheres demonstrate outstanding microwave absorption(MA)performance benefited from these *** obtained RL value was-63.95 dB at an ultra-thin thickness of 1.2 mm,corresponding to an effective absorption bandwidth(EAB)of 4.56 *** work demonstrates that the trilayer core-shell structure designing strategy is highly efficient for tuning the MA performance of MXene-based microspheres.

关键词： SiO_(2)@Ti_(3)C_(2)T_(x)@CoNi hydrangea-like core-shell structure spherical capacitor high-performance microwave absorption(MA) interfacial polarization impedance match

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Study on Mechanical Properties and Reduction Behavior of Agglomerated Fines Raw materials for Pig Iron Production

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Journal of The Institution of Engineers (India): Series D 2024年第2期105卷 1167-1176页

作者： Biswas, Chanchal Majumder, Arghya Dey, Rajib Chaudhuri, Mahua Ghosh Department of Metallurgical Engineering Kazi Nazrul University Asansol713340 India Department of Metallurgical and Material Engineering Jadavpur University Kolkata700032 India School of Materials Science and Nano Technology Jadavpur University Kolkata700032 India

Fines iron ore oxides are generated during mechanized mining as well as comminution, beneficiation, transportation, and agglomeration processes. These iron ore fines need to be taken care of and reused in ironmaking. The present work focuses on the utilization of those fines by agglomeration techniques and converting them into reduced composite briquettes under fixed load compaction with variation of binder percentage. The composite briquettes were made using equal proportions of bentonite and molasses, starting with 1 weight percent of each, then 2, 3, 4, 5, and up to 6 weight percent of each. All sets of composite briquettes were investigated for mechanical stability, such as shatter strength and abrasion strength. The standard reducing furnace was used to reduce the same composite briquettes. The weight loss technique was applied to calculate the extent of reduction in each experiment. The agglomerated iron ore composite briquettes could be significantly reduced with an increasing binder percentage and a blended mixture of boiler coal and coke dust. They show better mechanical properties with a higher binder percentage. The laboratory-scale smelting of the optimized sample was conducted to produce pig iron. Input raw materials samples, reduced specimens, and smelting samples were characterized by using X-ray spectroscopy (EDX), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), chemical analysis and optical microscopic analysis. © The Institution of Engineers (India) 2023.

关键词： Energy dispersive spectroscopy

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Microscopic computed tomography aided finite element modelling as a methodology to estimate hygroexpansion coefficients of wood: a case study on opposite and compression wood in softwood branches

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Holzforschung 2023年第9期77卷 700-712页

作者： Florisson, Sara Hartwig, Marie Wohlert, Malin Gamstedt, Erik Kristofer Division of Applied Mechanics Department of Material Science and Engineering Uppsala University Ångströmlaboratoriet Lägerhyddsvägen 1 Uppsala751 03 Sweden

Microscopic X-ray computed tomography (XμCT) aided finite element (FE) modelling is a popular method in material science to relate material properties to heterogeneous microstructures. Recently, a methodology was developed for the XμCT aided FE modelling of wood, which characterises the process from specimen preparation to estimation of material properties. In the current research, this methodology is tested on branches of Norway spruce (Picea abies (L.) Karst.) to estimate the hygroexpansion coefficients of opposite (OW) and compression wood (CW). These properties are largely unknown and have engineering implications. The study is complemented by measurements of density, moisture content (MC) and elastic moduli. Results showed that the methodology assisted in the design of an integrated process and the identification of bottlenecks. It was seen that the level of detail of the numerical model had a strong influence on the obtained hygroexpansion properties. CW from branches showed higher density and longitudinal shrinkage coefficients, and elastic moduli less affected by MC. These differences are unlikely caused by MC, but more likely by the characteristics of the microstructure. © 2023 the author(s), published by De Gruyter, Berlin/Boston.

关键词： Microstructure

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Heart rate variability-based Model for estimating the severity of orthostatic hypotension in patients with REM sleep behavior disorder 46

Heart rate variability-based Model for estimating the severi...

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46th Annual International Conference of the IEEE engineering in Medicine and Biology Society, EMBC 2024

作者： Saeda, Shota Fujiwara, Koichi Sumi, Yukiyoshi Kadotani, Hiroshi Nagoya University Department of Material Process Engineering Nagoya Japan Shiga University of Medical Science Department of Psychiatry Shiga Japan

ISBN: (纸本)9798350371499

Background: Orthostatic hypotension (OH) is a typical autonomic dysfunction in patients with idiopathic REM sleep behavior disorder (iRBD). The Schellong test is a well-known method to evaluate the presence of OH;however, it is burdensome for both patients and the medical staff from the viewpoint of ensuring patient safety. In this study, we developed a machine learning (ML) model to discriminate the presence or absence of OH based on heart rate variability (HRV) in the supine position. Methods: We recruited elderly healthy participants (HC) and iRBD patients and measured participants' R-R interval (RRI) during the Schellong test. The HRV features were calculated from the RRIs and were used as inputs for the ML model. We trained an ML model that combines two binary classifiers. The first model classifies HC and iRBD, and the second model discriminates the classified patients with iRBD between OH(-) and OH(+). Results: The macro average classification performance was accuracy of 81%, recall of 73%, precision of 82%, and F-measure of 68%. In addition, the sensitivity for OH(+)iRBD was 100%. Conclusion: Utilizing this ML model will help to reduce the burden of the Schellong test. © 2024 IEEE.

关键词： Heart

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Releasing Residual Stress in Metal-Coated Fibers Through Heat Treatment Process for Distributed High-Temperature Sensing Applications

Releasing Residual Stress in Metal-Coated Fibers Through Hea...

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CLEO: science and Innovations in CLEO 2024, CLEO: S and I 2024 - Part of Conference on Lasers and Electro-Optics

作者： Dey, Koustav Saha, Rony Kumar Narasimman, S. Zhang, Bohong Mumtaz, Farhan O'Malley, Roanld J. Smith, Jeffrey D. Gerald, Rex E. Huang, Jie Department of Electrical and Computer Engineering Missouri University of Science and Technology RollaMO65409 United States Department of Material Science and Engineering Missouri University of Science and Technology RollaMO65409 United States

The study investigates a refined heat treatment methodology tailored for commercial metal-coated optical fibers, with the objective of accurately reducing residual stress to prime them for use in distributed sensing a... 详细信息

关键词： Optical fibers

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Inverse-opal structured TiO_(2) regulating electrodeposition behavior to enable stable lithium metal electrodes

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Green Energy & Environment 2023年第6期8卷 1664-1672页

作者： Xuewen Wu Shaolun Cui Minfei Fei Sheng Liu Xueping Gao Guoran Li Institute of New Energy Material Chemistry School of Materials Science and EngineeringRenewable Energy Conversion and Storage CenterNankai UniversityTianjin300350China Department of Materials Science and Metallurgy University of CambridgeCambridge CB30FSUK

Lithium metal anode is almost the ultimate choice for high-energy density rechargeable batteries, but its uneven electrochemical dissolution-deposition characteristics lead to poor cycle stability and lithium dendrites safety problems. The fundamental solution to the problems is to interfere electrodeposition process of lithium metal so that it can be carried out reversibly and stably. In this work, an inverse-opal structured TiO2membrane with a thickness of only ~1 μm is designed to regulate the electrodeposition behavior of lithium metal, in which the ordered channels homogenize mass transfer process, the anatase TiO_(2)walls of the ion channels reduce desolvation barrier of solvated lithium-ions, and the spherical cavities with a diameter of ~300 nm confine migration of the adsorbed lithium atoms during electrocrystallization to diminish overpotential of lithium. These systematic effects cover and essentially change the whole process of electrodeposition of lithium metal and eliminate the possibility of lithium dendrite formation. The as-obtained lithium metal electrode delivers a Coulombic efficiency of 99.86% in the 100th cycle, and maintains a low deposition overpotential of 0.01 V for 800 h.

关键词： Lithium metal anode Inverse-opal structure TiO2 Electrodeposition Lithium-sulfur battery

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Machine-learning Assisted Insights into Cytotoxicity of Zinc Oxide Nanoparticles 8

Machine-learning Assisted Insights into Cytotoxicity of Zinc...

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8th Nanosafe International Conference on Health and Safety Issues Related to Nanomaterials for a Socially Responsible Approach, NANOSAFE 2023

作者： Bilgi, E. Karakus, C. Oksel Izmir Institute of Technology Department of Bioengineering Izmir Turkey Izmir Institute of Technology Department of Material Science and Engineering Izmir Turkey

Zinc oxide nanoparticles (ZnO NPs) are commercially used as an active ingredient or a color additive in foods, pharmaceuticals, sun protection lotions, and cosmetic products. While the use of ZnO NPs in everyday products has not been linked to any serious health issues so far, the scientific evidence generated for their safety is not conclusive and, in most cases, could not be validated further in in vivo settings. To settle controversies arising from inconsistent in vitro findings in previous research focusing on the toxicity ZnO NPs, we combined the results of 25+ independent studies. One way analysis of variance (ANOVA) and classification and regression tree (CART) algorithm were used to pinpoint intrinsic and extrinsic factors influencing cytotoxic potential of ZnO in nanoscale. Particle size was found to have the most significant impact on the cytotoxic potential of ZnO NPs, with 10 nm identified as a critical diameter below which cytotoxic effects were elevated. As expected, strong cell type-, exposure duration- and dose-dependency were observed in cytotoxic response of ZnO NPs, highlighting the importance of assay optimization for each cytotoxicity screening. Our findings also suggested that ≥12 hours exposure to NPs resulted in cytotoxic responses irrespective of the concentration. Considering the cumulative nature of research processes where advances are made through subsequent investigations over time, such meta-analytical approaches are critical to maximizing the use of accumulated data in nano-safety research. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： ZnO nanoparticles

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Sacrificial template synthesis of(V_(0.8)Ti_(0.1)Cr_(0.1))_(2)AlC and carbon fiber@(V_(0.8)Ti_(0.1)Cr_(0.1))_(2)AlC microrods for efficient microwave absorption

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Journal of materials science & Technology 2022年第16期111卷 236-244页

作者： Wei Luo Yi Liu Chuangye Wang Dan Zhao Xiaoyan Yuan Jianfeng Zhu Lei Wang Shouwu Guo School of Material Science and Engineering Shaanxi University of Science and TechnologyXi’an 710021China Department of Electronic Engineering School of Electronic Information and Electrical EngineeringShanghai Jiao Tong universityShanghai 200240China

The morphology of MAX phase powders significantly influences their microwave absorption ***,the traditional synthesis via solid-state reactions produces irregular powders,and the preparation of MAX phase powders with specific morphology remains a ***,(VTiCr)Al C MAX phase microrods were fabricated for the first time in NaCl/KCl molten salts using vanadium,titanium,chromium,aluminum,and short carbon fibers as *** was found that despite acting as a carbon source,carbon fibers also acted as sacrificial *** adjusting the molar ratio of metal powders and short carbon fibers,a series of carbon fiber@(V_(0.8)Ti_(0.1)Cr_(0.1))_(2)AlC microrods with core-sheath structure were also *** fiber@(V_(0.8)Ti_(0.1)Cr_(0.1))_(2)AlC microrods with a molar ratio of 8:2 showed the optimum microwave absorption *** reflection loss(RL)value reached up to–63.26 d B at 2.40 mm,and the effective absorption bandwidth(EAB)was about 5.28 GHz with a thickness of2.02 *** on the electromagnetic parameter analysis and theoretical simulation,the enhanced microwave absorption performance was attributed to the synergistic effect of different factors like dielectric loss,magnetic loss,multiple reflection,and *** work offers a facile route to modulate the morphology of MAX phase powders and may accelerate its application as microwave absorbers.

关键词： MAX phases Microwave absorption Sacrificial template Microrod

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Spherical modification of tungsten powder by particle composite system

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Rare Metals 2022年第6期41卷 1972-1976页

作者： Cong-Cong Wang Cheng-Chang Jia Peng Gao Guo-Sheng Gai Yu-Fen Yang School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Powder Technology R&D Group Department of Material Science and EngineeringTsinghua UniversityBeijing 100084China

Owing to contradiction between increasing demand of spherical tungsten powder and limitation of traditional manufacturing technology,a novel preparation method was developed to sphericize the polygonal tungsten powder by means of modification of particle composite *** powder particles were modified by par-ticle composite system,and detailed characterization by scanning electron microscopy(SEM)was *** size distribution and function mechanism were analyzed,and the internal relationship between average diameter and processing time was *** results show that the spherical tungsten powder with an average diameter of 6.41μm is obtained from polyhedral tungsten powder with an average diameter of 7.50μ*** spherical effect could be achieved(sharp edge angles of particles are rounded off and reshaped)when the processing time is over 30 *** relationship between average diameter(d)and pro-cessing time can be described by the exponential decay model,which provides a good interpretation for the process of *** relationship between them can be expressed by the equation d=1.87406exp(-x/8.92718)+*** proposed method could readily enable large-scale production of spherical tungsten powder.

关键词： Tungsten powder Modification Average diameter Powder metallurgy

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Passerini and thiol-ene reactions: A facile, green, and efficient route to high-performance bio-based plasticizers

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Progress in Natural science:materials International 2024年第6期34卷 1249-1257页

作者： Menghua Feng Xuyi Wang Wenjia Jiang Jianming Zhao Yutong Xie Haojun Fan Qiang Yan Jun Xiang College of Biomass Science and Engineering Sichuan University China Blue-Star Chengrand Co. Ltd. High-Tech Organic Fibers Key Laboratory of Sichuan Province Guangzhou Wenjia New Material Technology Co. Ltd. State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science Fudan University

The increasing global demand for sustainable alternatives to petroleum-based plasticizers, particularly in poly(-vinyl chloride)(PVC) products, has intensified the exploration of bio-based options derived from renewable resources such as plant oils. Traditional bio-based plasticizers, while promising, often suffer from limitations such as low molecular weight, high volatility, and poor compatibility with PVC, thereby restricting their practical applications. To surmount this hurdle, we introduce a novel synthetic route combining the Passerini reaction with the thiol-ene click reaction, aimed at producing high-performance plant oil-based plasticizers(POPs) with enhanced ester content and molecular weight. This method offers significant advantages over traditional methods,including low reaction temperatures(≤40°C), ultrahigh yield(95 %) when using ethanol as the solvent, and precise control over ester content. Furthermore, the key findings demonstrate that the designed and synthesized POP(bio-content, 69 %) produced using this method exhibits outstanding overall performance, such as excellent migration resistance, good compatibility with PVC, and high thermal stability compared to traditional *** facile, green, and efficient method may significantly advance the adoption of bio-based plasticizers, establishing them as a viable alternative to petroleum-based counterparts.

关键词： Bio-based plasticizers Passerini reaction Thiol-ene click reaction Plant oil Sustainability

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