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Evaluation of elastic-viscoplastic self-consistent models for a rolled AZ31B magnesium alloy under monotonic loading along five different material orientations and free-end torsion

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Journal of Magnesium and Alloys 2023年第4期11卷 1264-1275页

作者： Xianyun Zhu Yuqian Wang Luiz Carneiro Huamiao Wang Yanyao Jiang Light Alloy Research Institute Central South UniversityChangsha 410012China Department of Mechanical Engineering University of NevadaRenoNV 89557USA College of Mechanical Engineering Shanghai Jiao Tong UniversityShanghaiChina

Comprehensive experiments including monotonic tension and monotonic compression of specimens taken from a rolled AZ31B Mg thick plate along five different material orientations with respect to the rolled direction(RD),and free-end torsion of a tubular specimen machined along the thickness direction(ND)were *** experimental results were used to evaluate an elastic-viscoplastic self-consistent model with the consideration of twinning and detwinning(EVPSC-TDT)on magnesium(Mg)*** EVPSC-TDT model provides stress-strain curves and the hardening rates in close agreement with the experimental results of all the 11 loading *** model adequately predicts the textures after fracture of all the 11 loading cases and the evolutions of tension twins with increasing strains for tension in the ND,compression in the RD,and torsion along the *** Swift effect was observed in the experiment and was properly simulated by the model.

关键词： Magnesium alloy Crystal plasticity Twinning Material orientation

Boride-based electrocatalysts:Emerging candidates for water splitting

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Nano Research 2020年第2期13卷 293-314页

作者： ZhiJie Chen Xiaoguang Duan Wei Wei Shaobin Wang Zejie Zhang Bing-Jie Ni Centre for Technology in Water and Wastewater School of Civil and Environmental EngineeringUniversity of Technology SydneyNSW 2007Australia 2 School of Chemical Engineering and Advanced MaterialsThe University o f AdelaideSouth Australia 5005Australia 3 State Key Laboratory for Powder MetallurgyCentral South UniversityChangsha 410083China

Electrocatalytic water splitting(EWS)is a promising route to produce hydrogen in a sustainable and environment-benign *** realize the large-scale hydrogen production,it is paramount to develop desirable electrocatalysts with engineered structure,high catalytic activity,facile accessibility,low cost,and good *** late,boride-based materials,especially transition-metal borides(TMBs),are emerging as promising candidates for the EWS ***,so far,ittle attempt has been made to provide a comprehensive summary on these ***,this review provides the up-to-date status on upgrading the catalytic performance of TMB-based nanomaterials by regulating the internal and external *** conventional synthetic techniques are first presented for the preparation of TMB-based ***,the advanced strategies are summarized to enhance the catalytic performance of TMBs,including morphology control,component regulation,phase engineering,surface oxidation and ***,the design principles of TMB-based electrocatalysts for high-performance EWS are ***,the current challenges and future directions in the development of TMB-based materials are *** review article is expected to envisage insights into the TMBs-based water splitting and to provide strategies for design of the next-generation TMB-based electrocatalysts.

关键词： transition-metal borides electrocatalysts water splitting oxygen evolution reaction hydrogen evolution reaction

Investigation of multi-step fast charging protocol and aging mechanism for commercial NMC/graphite lithium-ion batteries

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Journal of Energy Chemistry 2023年第5期80卷 237-246,I0006页

作者： Yaqi Li Jia Guo Kjeld Pedersen Leonid Gurevich Daniel-Ioan Stroe Department of Materials and Production Aalborg UniversityAalborg 9220Denmark Department of Energy Aalborg UniversityAalborg 9220Denmark

Fast charging is considered a promising protocol for raising the charging efficiency of electric ***,high currents applied to Lithium-ion(Li-ion)batteries inevitably accelerate the degradation and shorten their *** work designs a multi-step fast-charging method to extend the lifetime of LiNi0.5Co0.2Mn0.3O2(NMC)/graphite Li-ion batteries based on the studies of half cells and investigates the aging mechanisms for different charging *** degradation has been studied from both full cell behaviour and materials perspectives through a combination of non-destructive diagnostic methods and post-mortem *** the proposed multi-step charging protocol,the state-of-charge(SOC)profile is subdivided into five ranges,and the charging current is set differently for different SOC *** of the designed multi-step fast charging protocols is shown to allow for a 200 full equivalent cycles longer lifetime as compared to the standard charging method,while the charging time is reduced by 20%.From the incremental capacity analysis and electrical impedance spectroscopy,the loss of active materials and lithium inventory on the electrodes,as well as an increase in internal resistance for the designed multistep constant-current-constant-voltage(MCCCV)protocol have been found to be significantly lower than for the standard charging ***-mortem analysis shows that cells aged by the designed MCCCV fast charging protocol exhibit less graphite exfoliation and crystallization damage,as well as a reduced solid electrolyte interphase(SEI)layer growth on the anode,leading to a lower Rseiresistance and extended lifetime.

关键词： Fast-charging Lithium-ion battery Aging mechanism Electrode

Transformation of chlorine in NaCl-loaded Victorian brown coal during the gasification in steam

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燃料化学学报 2012年第12期40卷 1409-1414页

作者： ZHANG Shu Mohammad Asadullah Rosalie Hocking LIN Jian-ying LI Chun-zhu Department of Chemical Engineering Monash University Fuels and Energy Technology Institute Curtin University of Technology Chemical Engineering Universiti Teknologi MARA Monash Centre for Synchrotron Science and School of Chemistry Monash University College of Chemistry and Chemical Engineering Taiyuan University of Technology

This study is to examine the changes in Cl volatilizations and chemical forms in NaCl-loaded Victorian brown coal during gasification in steam at 800 ℃ using Cl K-edge X-ray absorption near-edge structure(XANES) *** char samples were prepared in a novel one-stage fluidised-bed / fixed-bed quartz reactor at a fast heating *** samples were then collected and sealed in an argon-filled bag in order to minimise possible oxidation of char and Cl by air prior to analysis by ***-steam reactions were found to significantly affect the transformation of Cl,including the possible formation of chlorine-containing organic *** the other hand,volatile-char interactions during the gasification appeared to enhance the Cl retention and prevent the formation of organic chlorine compounds in chars.

关键词：气化理论燃料化学研究发展

Real-time molecular imaging of near-surface tissue using Raman spectroscopy

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Light(Science & Applications) 2022年第5期11卷 820-831页

作者： Wei Yang Florian Knorr Ines Latka Matthias Vogt Gunther O.Hofmann Jürgen Popp Iwan W.Schie Leibniz Institute of Photonic Technology Jena Albert-Einstein-Straße 907745 JenaGermany Department of Trauma Hand and Reconstructive SurgeryUniversity Hospital JenaAm Klinikum 107747 JenaGermany Institute of Physical Chemistry and Abbe Center of Photonics Friedrich-Schiller University JenaHelmholtzweg 407743 JenaGermany Department of Medical Engineering and Biotechnology University of Applied Sciences-JenaCarlZeiss-Promenade 207745 JenaGermany

The steady progress in medical diagnosis and treatment of diseases largely hinges on the steady development and improvement of modern imaging *** spectroscopy has attracted increasing attention for clinical applications as it is label-free,non-invasive,and delivers molecular fingerprinting information of a *** combination with fiber optic probes,it also allows easy access to different body parts of a ***,image acquisition with fiber optic probes is currently not ***,we introduce a fiber optic probe-based Raman imaging system for the real-time molecular virtual reality data visualization of chemical boundaries on a computer screen and the physical *** approach is developed around a computer vision-based positional tracking system in conjunction with photometric stereo and augmented and mixed chemical reality,enabling molecular imaging and direct visualization of molecular boundaries of three-dimensional *** proposed approach achieves a spatial resolution of 0.5 mm in the transverse plane and a topology resolution of 0.6 mm,with a spectral sampling frequency of 10 Hz,and can be used to image large tissue areas in a few minutes,making it highly suitable for clinical tissueboundary demarcation.A variety of applications on biological samples,i.e.,distribution of pharmaceutical compounds,brain-tumor phantom,and various types of sarcoma have been characterized,showing that the system enables rapid and intuitive assessment of molecular boundaries.

关键词： diagnosis enable intuitive

Bioactive glass-based fibrous wound dressings

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Burns & Trauma 2022年第1期10卷 256-271页

作者： Shahin Homaeigohar Meng Li Aldo R.Boccaccini School of Science and Engineering University of DundeeDundee DD14HNUnited Kingdom Institute of Biomaterials Department of Materials Science and EngineeringUniversity of Erlangen-Nuremberg91058 ErlangenGermany

Since the discovery of silicate bioactive glass(BG)by Larry Hench in 1969,different classes of BGs have been researched over decades mainly for bone *** recently,validating the beneficial influence of BGs with tailored compositions on angiogenesis,immunogenicity and bacterial infection,the applicability of BGs has been extended to soft tissue repair and wound ***,fibrous wound dressings comprising BG particle reinforced polymer nanofibers and cotton-candy-like BG fibers have been proven to be successful for wound healing *** fibrous dressing materials imitate the physical structure of skin’s extracellular matrix and release biologically active ions ***,pro-angiogenic and antibacterial ions,***,copper,zinc,etc.,that can provoke cellular activities to regenerate the lost skin tissue and to induce new vessels formation,while keeping an anti-infection *** the current review,we discuss different BG fibrous materials meant for wound healing applications and cover the relevant literature in the past *** production methods for BG-containing fibers are explained and as fibrous wound dressing materials,their wound healing and bactericidal mechanisms,depending on the ions they release,are *** present gaps in this research area are highlighted and new strategies to address them are suggested.

关键词： Scaffolds Fibers Angiogenesis Wound healing Bioactive glass

Evaluation of the performance of yielding rockbolts during rockbursts using numerical modeling method

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International Journal of Coal Science & Technology 2022年第6期9卷 25-50页

作者： Jun Wang Derek B.Apel Huawei Xu Chong Wei School of Mining and Petroleum Engineering University of AlbertaT6G 2R3 EdmontonABCanada

Rockburst;Rockburst damage;Yielding rockbolt;Numerical modeling;UDEC;Underground miningThe assessment of yielding rockbolt performance during rockbursts with actual seismic loading is essential for rock-burst supporting *** this paper,two types of yielding rockbolts(D-bolt and Roofex)and the fully resin-grouted rebar bolt are modeled via the"rockbolt"element in universal distinct element code(UDEC)after an exact calibration procedure.A two-dimensional(2D)model of a deep tunnel is built to fully evaluate the performance(e.g.,capacity of energy-absorption and control of rock damage)of yielding and traditional rockbolts based on the simulated *** influence of different rockburst magnitudes is also *** results suggest that the D-bolt can effectively control and mitigate rockburst damage during a weak rockburst because of its high strength and deformation *** Roofex is too"soft"or"smooth"to limit the movement of ejected rocks and restrain the large deformation,although it has an excellent deformation *** resin-grouted rebar bolt can maintain a high axial force level during rockbursts but is easy to break during dynamic shocks,which fails to control rapid rock bulking or *** types of rockbolts cannot control the large deformation and mitigate rockburst damage effectively during violent *** rockburst damage severity can be significantly reduced by additional support with cable *** study highlights the effectiveness of numerical modeling methods in assessing the complex performance of yielding rockbolts during rockbursts,which can provide some references to improve and optimize the design of rock supporting in burst-prone grounds.

关键词： Rockburst Rockburst damage Yielding rockbolt Numerical modeling UDEC Underground mining

Sustainable development of unconventional resources: Analysis of the transient linear flow oriented straight-line analysis technique

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Energy Reviews 2024年第1期3卷 49-75页

作者： Dan Xue Liangliang Jiang Zixiang Wei Maojie Chai Jiang Liu Peng Deng Fuhe Lin Jian Li Jiansheng Zhang Zhangxing Chen Department of Chemical and Petroleum Engineering University of CalgaryCalgaryAlbertaCanada Guangdong University of Petrochemical and Technology MaomingChina School of Mathematics and Data Science Shaanxi University of Science and TechnologyXi'anChina Department of Energy and Power Engineering Tsinghua UniversityBeijingChina Eastern Institute for Advanced Study NingboChina china University of Petroleum(Beijing) BeijingChina

On the backdrop of dwindling conventional reserves,unconventional reservoirs have emerged as a pivotal chapter in resource *** their challenges,such as low permeability,complex fluid storage,and flow mechanisms,hydraulic fracturing technology has underpinned the development of unconventional ***,this has brought about a shift in the sequence of flow regimes,e.g.,the transient radial flow regime has been largely shortened by the lengthy transient linear flow regime due to the low permeability of unconventional ***,straight-line analysis(SLA),the simplest technique in rate transient analysis(RTA),is a fundamental and potent tool for swiftly extracting reservoir and hydraulic fracture information,estimating oil and gas reserves,and furnishing crucial initial data for subsequent historical matching ***,there is currently a dearth of review papers pertaining to a necessary guide of applying SLA in various transient linear flow(TLF)regimes and different unconventional ***,this paper commences by elucidating the classification of TLF regimes,commonly used methods for recognizing flow regimes,and the diverse SLA methods used for different TLF ***,it delves into a discussion of different modification techniques for variable rate/flowing pressure,gas phase,complex reservoir characteristics in unconventional reservoirs,and dynamic drainage area concepts ***,the application of SLA in specific domains,namely core analysis and the flowback period,is *** culminates by surveying the advancements through an integration of novel technologies to enhance estimation *** paper also highlights certain drawbacks of current SLA technology and proposes new research ***,this paper would serve as an indispensable resource,offering foundational knowledge for the application of SLA in TLF to promote the production of global unconventional resources in a c

关键词： Unconventional reservoirs Straight-line analysis(SLA) Transient linear flow(TLF) Oil/gas reserves Hydraulic fracture information

Fluidization behavior and reduction kinetics of pre-oxidized magnetite-based iron ore in a hydrogen-induced fluidized bed

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International Journal of Minerals,Metallurgy and Materials 2022年第10期29卷 1873-1881页

作者： Heng Zheng Oday Daghagheleh Thomas Wolfinger Bernd Taferner Johannes Schenk Runsheng Xu Chair of Ferrous Metallurgy Montanuniversitaet LeobenFranz-Josef-Straβe 188700LeobenAustria K1-MET GmbH Stahlstraße 144020 LinzAustria The State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

The influence of different pre-oxidation temperatures and pre-oxidation degrees on the reduction and fluidization behaviors of magnetite-based iron ore was investigated in a hydrogen-induced fluidized *** raw magnetite-based iron ore was pre-oxidized at 800 and1000℃ for a certain time to reach a partly oxidation and deeply oxidation *** structure and morphology of the reduced particles were analyzed via optical microscope and scanning electron microscopy(SEM).The reaction kinetic mechanism was determined based on the double-logarithm *** results indicate that the materials with higher oxidation temperature and wider particle size range show better fluidization *** lower oxidation temperature is more beneficial for the reduction rate,especially in the later reduction *** pre-oxidation degree shows no obvious influence on the fluidization and reduction *** on the kinetic analysis,the reduction progress can be divided into three *** reduction mechanism was discussed combing the surface morphology and phase structure.

关键词： magnetite-based iron ore prior oxidation fluidization behavior kinetic analysis hydrogen reduction