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Ni_(3)Fe/Ni_(4)S_(3)/Ni/C Mixed Crystal Composite Nanofibers Prepared by Electrospinning and Heat Treatment Methods for Oxygen Evolution Reaction

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Journal of Wuhan University of Technology(materials science) 2023年第2期38卷 267-273页

作者： LI Tao ZHONG Shujie LOU Qiongyue LING Shuai CHEN Jian MA Guohua YANG Mao WU Xiaoqiang Department of Materials Engineering School of Mechanical EngineeringChengdu UniversityChengdu610106China Material Corrosion and Protection Key Laboratory of Sichuan Province Zigong643000China Analysis and Testing Center Southwest University of Science and TechnologyMianyang621010China

OER catalyst of Ni_(3)Fe/Ni_(4)S_(3)/Ni/C(NiFeSC series)mixed crystal composite nanofibers was prepared by electrospinning and atmospheric heat treatment *** testing results indicate that the diameters of Ni_(3)Fe/Ni_(4)S_(3)/Ni/C composite nanofibers is about 200 nm,the grains size is about 1-3 nm,and the fiber surface is *** electrochemical test results show that the heterojunction of the prepared Ni_(3)Fe/Ni_(4)S_(3)/Ni/C hybrid crystal composite nanofiber has synergistic effect with sulfide,and exhibits good electrocatalytic activity of water decomposition and OER in alkaline *** OER electrocatalytic performance of Ni_(3)Fe/Ni_(4)S_(3)/Ni/C composite electrode prepared via a heat treatment at 1000℃process was tested in 1 mol/L KOH *** results show that the overpotential is about 298 mV,the Tafel slope is about 74 mV?dec-1,and the surface resistance is about 1.69Ω·cm^(2),at the current density of 10 mA·cm^(-2).

关键词： mixed crystal composite material nanofiber NiFeSC oxygen evolution reaction(OER)

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Kilogram-scale production of strong and smart cellulosic fibers featuring unidirectional fibril alignment

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National science Review 2024年第10期11卷 34-41页

作者： Jianguo Li Chaoji Chen Qiongyu Chen Zhihan Li Shaoliang Xiao Jinlong Gao Shuaiming He Zhiwei Lin Hu Tang Teng Li Liangbing Hu Department of Materials Science and Engineering University of Maryland College Park Department of Mechanical Engineering University of Maryland College Park

Multifunctional fibers with high mechanical strength enable advanced applications of smart textiles,robotics, and biomedicine. Herein, we reported a one-step degumming method to fabricate strong, stiff, and humidity-responsive smart cellulosic fibers from abundant natural grass. The facile process involves partially removing lignin and hemicellulose functioning as glue in grass, which leads to the separation of vessels,parenchymal cells, and cellulosic fibers, where cellulosic fibers are manufactured at kilogram scale. The resulting fibers show dense and unidirectional fibril structure at both micro-and nano-scales, which demonstrate high tensile strength of ～0.9 GPa and Young's modulus of 72 GPa, being 13-and 14-times higher than original grass. Inspired by stretchable plant tendrils, we developed a humidity-responsive actuator by engineering cellulosic fibers into the spring-like structures, presenting superior response rate and lifting capability. These strong and smart cellulosic fibers can be manufactured at large scale with low cost, representing promising a fiber material derived from renewable and sustainable biomass.

关键词： cellulosic fiber uniaxial fibril biomass actuator smart fiber

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Enhanced nitrate removal from groundwater using a conductive spacer in flow-electrode capacitive deionization

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Chinese Chemical Letters 2024年第8期35卷 379-382页

作者： Hongjie Guo Qiang Wei Yangyang Wu Wei Qiu Hongliang Li Changyong Zhang College of Mining Engineering Taiyuan University of TechnologyTaiyuan 030024China CAS Key Laboratory of Urban Pollutant Conversion Department of Environmental Science and EngineeringUniversity of Science and Technology of ChinaHefei 230026China CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern MechanicsUniversity of Science and Technology of ChinaHefei 230026China

Flow-electrode capacitive deionization(FCDI)represents a promising approach for ion separation from aqueous ***,the optimization of spacer,particularly for nitrate-contaminated groundwa-ter systems,has often been *** research comprehensively investigates the influence of using a conductive(carbon cloth,CC)spacer on nitrate removal performance within FCDI system,comparing it to a non-conductive(nylon net,NN)*** both CC and NN FCDI systems,it is unsurprisingly that nitrate removal efficiency improved notably with the increasing current density and hydraulic retention time(HRT).Interestingly,the specific energy consumption(SEC)for nitrate removal did not show obvious fluctuations when the current density and HRT varied in both *** the auspiciously optimized process parameters,CC-FCDI attained a 20%superior nitrate removal efficiency relative to NN-FCDI,ac-companied by a notably diminished SEC for CC-FCDI,registering at a mere 28%of *** great improvement can be primarily attributed to the decrement in FCDI internal resistance after using con-ductive spacer,which further confirmed by electrochemical tests such as linear sweep voltammetry(LSV)and electrochemical impedance spectroscopy(EIS).Upon prolonged continuous nitrate removal at the optimized conditions,the CC-FCDI system achieved a consistent 90%nitrate removal efficiency with a low SEC of 2.7-7.8 kWh/kg NO_(3)-N,underscoring its steady ***,this study highlights the pivotal importance of careful spacer design and optimization in realizing energy-efficient groundwater treatment via FCDI.

关键词： Flow-electrode capacitive deionization Carbon cloth Nitrate Underground water Ions transport

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On the Lüders band formation and propagation in NiTi shape memory alloys

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Journal of materials science & Technology 2022年第21期116卷 22-29页

作者： Bashir S.Shariat Yingchao Li Hong Yang Yunzhi Wang Yinong Liu Department of Mechanical Engineering The University of Western Australia35 Stirling HighwayPerthWA 6009Australia Department of Materials Science and Engineering The Ohio State UniversityColumbusOH 43210USA

Near-equiatomic NiTi shape memory alloys are known to exhibit Lüders-type deformation associated with a stress-induced *** studies have been conducted in the past mainly focusing on the macroscopic characteristics of the phenomenon and some theories have been proposed in the literature to explain its mechanisms,but some aspects of this phenomenon are still unclear,particularly at the microscopic *** study investigated the local strain evolution during the initiation and propagation of Lüders band in a pseudoelastic NiTi alloy during tensile deformation by means of digital image correlation(DIC)*** on the evidence collected,distinct stages of Lüders band formation and propagation are defined and the corresponding local strain rates are *** local strain rates are much higher than the global strain rate of the testing,giving insight to the mechanism of this phenomenon.

关键词： Shape memory alloy(SMA) NiTi Martensitic transformation Lüders-type deformation Lüders band Digital image correlation(DIC)

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Deformation-induced interfacial-twin-boundary ω-phase in an Fe_(48)Mn_(37)Al_(15) body-centered cubic metastable alloy

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Journal of materials science & Technology 2023年第15期146卷 252-258页

作者： Huabei Peng Xiao Yang Lixin Sun Liqiu Yong Jiazhen Yan Jinyong Zhang Bingnan Qian Yuhua Wen School of Mechanical Engineering Sichuan UniversityChengdu 610065China School of Mechanical Engineering Hebei University of TechnologyTianjin 300401China State Key Laboratory of Materials Processing and Die and Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China School of Materials and Physics China University of Mining and TechnologyXuzhou 221116China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China Innovation Center NPU ChongqingChongqing 401135China Department of Mechanical and Energy Engineering Southern University of Science and TechnologyShenzhen 518055China

Omega(ω)phase has a trigonal or hexagonal crystal structure and was first discovered inβ-type Ti-Cr alloys[1].Since then,theω-phase has been widely reported in numerous group IV transition metal(Ti,Ta,Hf,and Zr)based alloys[2–9].The morphologies ofω-phase could be particle-like(athermalω-phase)[10],ellipsoidal or cuboidal after aging(isothermalω-phase)[11],and plate-like after deformation(stress-relatedω-phase)[12].Amongst,the stressrelatedω-phase is usually located at the twinning boundary,thus also called interfacial-twin-boundary-ω(ITB-ω)*** formation of the ITB-ωphase is considered to be related to the formation of{112}bcc<111>mechanical twin(i.e.,{112}bcc twin)in bodycentered cubic(BCC)metals and alloys[13].

关键词： alloys alloy deformation

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Mechanistic model for hydrogen accelerated fatigue crack growth in a low carbon steel

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International Journal of Hydrogen Energy 2025年 136卷 722-730页

作者： Hosseini, Zahra S. Dadfarnia, Mohsen Kubota, Masanobu Nagao, Akihide Somerday, Brian P. Sofronis, Petros Ritchie, Robert O. Kyushu University 744 Moto-oka Nishi-ku Fukuoka Fukuoka819-0395 Japan University of Illinois Urbana-Champaign Department of Mechanical Science and Engineering 1206 W. Green St. UrbanaIL61801 United States Seattle University Department of Mechanical Engineering 901 12th Ave. SeattleWA98122 United States University of California Berkeley Department of Materials Science and Engineering BerkeleyCA94720 United States

Fracture by hydrogen accelerated fatigue crack growth is a severe type of environmental failure. Although fatigue crack growth has been the subject of intense investigation over several decades, a complete mechanistic and predictive model is still lacking. Such a crack growth model is even more rare in the case of hydrogen in view of the lack also of constitutive models for material deformation under cycling loading that account for the hydrogen effect. In this study, we present a model for fatigue crack propagation induced by alternating crack tip plastic blunting and re-sharpening, which in the presence of hydrogen can be accelerated by hydrogen enhanced dislocation motion and generation. The Chaboche constitutive model, which is a nonlinear kinematic hardening model capable of capturing many features of material behavior under cyclic loading, is used for the calculation of the stress and strain fields at the propagating crack tip. The Chaboche model is calibrated using a sequence of experimental data from uniaxial strain-controlled cyclic loading tests and uniaxial stress-controlled ratcheting tests with a low carbon steel, JIS SM490YB, in the absence and presence of hydrogen. The numerical simulation results indicate that the proposed crack propagation model can predict Paris law behavior and can successfully demonstrate acceleration of fatigue crack growth in the presence of hydrogen. Significantly, the profiles of the steady-state opening stress and strain ahead of the fatigue crack tip in a compact tension (C(T)) specimen were found to have sections over which they vary as ln(1/r) with distance r from the crack tip, consistent with the crack-tip strain field for a non-stationary crack. © 2024

关键词： Crack tips

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Experimental Construction of Mohr–Coulomb Model for Green Sand Mold by Direct Shear Test Eliminating Effect of Wall Friction

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International Journal of Metalcasting 2025年 1-11页

作者： Okimura, Yasuhiko Kumaki, Takumi Yoshida, Hideki Nishi, Kohei Kato, Noriyuki Tokunaga, Koji Hashimoto, Kunihiro Matsuura, Makoto Koroyasu, Sadatoshi Komine, Hideo Maeda, Yasuhiro Okane, Toshimitsu Miyashita, Tomoyuki Yoshida, Makoto Department of Modern Mechanical Engineering Graduate School of Creative Science and Engineering Waseda University Tokyo Shinjuku169-8555 Japan SINTOKOGIO Ltd Aichi Nagoya450-6424 Japan Faculty of Science and Engineering Department of Mechanical and Precision Systems Teikyo University Tochigi Utsunomiya320-8551 Japan Department of Civil and Environmental Engineering School of Creative Science and Engineering Waseda University Tokyo Shinjuku169-8555 Japan Department of Mechanical Engineering School of Engineering Daido University Aichi Nagoya457-8530 Japan Faculty of Technologists Department of Manufacturing Technologists Institute of Technologists Saitama Gyoda361-0038 Japan Department of Modern Mechanical Engineering School of Creative Science and Engineering Waseda University Tokyo Shinjuku169-8555 Japan Kagami Memorial Research Institute for Materials Science and Technology Waseda University Tokyo Shinjuku169-0051 Japan Tajima Light Metal Co. Ltd. Saitama Hanyu Japan

This paper performed the direct shear test for a green sand mold to construct the Mohr–Coulomb (MC) model as a mechanical model of the green sand mold, which is essential to predict the casting deformation by computer simulation. It is generally known that the pressure loaded on the test piece is not fully transmitted to its shear plane in the direct shear test because of the friction between the test piece and the shear box. A previous study estimated the vertical stress on the shear plane from the pressure transmission coefficient measured when the test piece was not sheared. However, this method ignored the change in the value and direction of the wall friction due to the dilatancy of the test piece during shearing. The present paper determines the values of the material constants in the MC model by two methods: by eliminating the effect of the wall friction during shearing and by ignoring that effect. In the prior method, the vertical stress on the shear plane is directly measured throughout the test by the load cell attached below the test piece. As a result, when the wall friction effect during shearing is not eliminated, the strength of the test piece was evaluated to be twice as large as that obtained eliminating the wall friction effect. With the MC model ignoring the wall friction, the computer simulation to predict the casting deformation will estimate the unrealistically high strength of the mold, leading to an erroneous prediction of the casting deformation. © The Author(s) 2025.

关键词： Bulk Density

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Automated classification of big X-ray diffraction data using deep learning models

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npj Computational materials 2023年第1期9卷 169-180页

作者： Jerardo E.Salgado Samuel Lerman Zhaotong Du Chenliang Xu Niaz Abdolrahim Materials Science program University of RochesterRochesterNew York 14627USA Department of Computer Science University of RochesterRochesterNew York 14627USA Department of Mechanical Engineering University of RochesterRochesterNew York 14627USA Laboratory for Laser Energetics University of RochesterRochesterNew York 14627USA

In current in situ X-ray diffraction(XRD)techniques,data generation surpasses human analytical capabilities,potentially leading to the loss of *** techniques require human intervention,and lack the performance and adaptability required for material *** the critical need for high-throughput automated XRD pattern analysis,we present a generalized deep learning model to classify a diverse set of materials’crystal systems and space *** our approach,we generate training data with a holistic representation of patterns that emerge from varying experimental conditions and crystal *** also employ an expedited learning technique to refine our model’s expertise to experimental *** addition,we optimize model architecture to elicit classification based on Bragg’s Law and use evaluation data to interpret our model’s *** evaluate our models using experimental data,materials unseen in training,and altered cubic crystals,where we observe state-of-the-art performance and even greater advances in space group classification.

关键词： Automate classify cubic

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Additive manufacturing of sustainable biomaterials for biomedical applications

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Asian Journal of Pharmaceutical sciences 2023年第3期18卷 1-36页

作者： Zia Ullah Arif Muhammad Yasir Khalid Reza Noroozi Mokarram Hossain Hao Tian Harvey Shi Ali Tariq Seeram Ramakrishna Rehan Umer Department of Mechanical Engineering University of Management&Technology LahoreSialkot Campus 51041Pakistan Department of Aerospace Engineering Khalifa University of Science and TechnologyAbu Dhabi 127788United Arab Emirates School of Mechanical Engineering Faculty of EngineeringUniversity of TehranTehranIran Zienkiewicz Centre for Computational Engineering(ZCCE) Faculty of Science and EngineeringSwansea UniversitySwansea SA18ENUK Department of Mechanical&Materials Engineering Western UniversityOntario N6A 3K7Canada Department of Mechanical Engineering Center for Nanofibers and NanotechnologyNational University of Singapore119260Singapore

Biopolymers are promising environmentally benign materials applicable in multifarious *** are especially favorable in implantable biomedical devices thanks to their excellent unique properties,including bioactivity,renewability,bioresorbability,biocompatibility,biodegradability and *** manufacturing(AM)is a flexible and intricate manufacturing technology,which is widely used to fabricate biopolymer-based customized products and structures for advanced healthcare ***-dimensional(3D)printing of these sustainable materials is applied in functional clinical settings including wound dressing,drug delivery systems,medical implants and tissue *** present review highlights recent advancements in different types of biopolymers,such as proteins and polysaccharides,which are employed to develop different biomedical products by using extrusion,vat polymerization,laser and inkjet 3D printing techniques in addition to normal bioprinting and four-dimensional(4D)bioprinting *** also incorporates the influence of nanoparticles on the biological and mechanical performances of 3D-printed tissue scaffolds,and addresses current challenges as well as future developments of environmentally friendly polymeric materials manufactured through the ***,there is a need for more focused research on the adequate blending of these biodegradable biopolymers for achieving useful results in targeted biomedical *** envision that biopolymer-based 3D-printed composites have the potential to revolutionize the biomedical sector in the near future.

关键词： 3D printing Biopolymers Biomedical Tissue engineering Sustainable biomaterials Additive manufacturing

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Trivalent Ni oxidation controlled through regulating lithium content to minimize perovskite interfacial recombination

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Rare Metals 2022年第1期41卷 96-105页

作者： Jin-Jin Zhao Xiao Su Zhou Mi Ying Zhang Yan-Jun Hu Hua-Jun Guo Yi-Nan Jiao Yu-Xia Zhang Yan Shi Wei-Zhong Hao Jing-Wei Wu Yi Wang Cun-Fa Gao Guo-Zhong Cao School of Materials Science and Engineering School of Mechanical EngineeringShijiazhuang Tiedao UniversityShijiazhuang 050043China School of Materials Science and Engineering Hebei Key Laboratory of Material Near Net Forming TechnologyHebei University of Science and TechnologyShijiazhuang 050018China State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing 210016China Department of Materials Science and Engineering University of WashingtonSeattleWA 98195-2120USA

Organic–inorganic hybrid perovskite solar cells,one of the most promising photovoltaic devices,have made great progress in their efficiency and preparation *** this study,uniform,highly conductive Li_(n)NiO_(x)(0≤n... 详细信息

关键词： Lithium ions Ni^(3+) Oxidized defect Photocurrent Perovskite solar cells

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