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A novel meth.d for modeling th. ph.se ch.nge of iron ore particles in th. coh.sive zone of a blast furnace

Particuology 2024年第3期86卷 252-261页

作者： Dianyu E Yingming Wen Jiayun dan Youyuan Jiang Guangch.o Wei Jiaxin Cui Jiangxi Provincial Key Laboratory for Simulation and Modelling of Particulate Systems Jiangxi University of Science and TechnologyNanchang330013China International Institute for Innovation Jiangxi University of Science and TechnologyNanchang330013China Ironmaking Plant Xiangtan Iron and Steel Corporation of Hunan HualingXiangtan411101China Sch.olof Transportation and Veh.cle Enginering Shandong University of TechnologyZibo255000China

Coh.sive zone plays a vital role in th. stable operation of a blast furnace(BF),yet th. complex ph.se ch.nge process of iron ore particles in th.s zone is still not well *** th.s study,a novel one-dimensional(1D)unsteady ph.se ch.nge model was developed to elucidate th. h.at transfer and melting mech.nisms of iron ore *** model validation,th. effects of several key operating parameters(e.g.,particle diameter,gas velocity,initial temperature)on th. ph.se ch.nge beh.vior of iron ore particles were analyzed,and th. joint effect of multiple parameters was *** results sh.w th.t larger-sized iron ore particles possess lower specific surface areas,wh.ch.in turn reduces th.ir convective h.at absorption ***,th. distance from th. solid-liquid ph.se interface to th. particle surface increases,th.reby slowing down th. movement of th. ph.se interface and pro-longing th. melting duration of th. *** th. gas velocity and th. initial temperature does not h.ve a significant impact on reducing th. duration of th. complete melting *** th. specified conditions,it is observed th.t increasing th. gas velocity by 3-fold and 9-fold results in a reduction of th. melting duration by 2.4%and 8.3%,*** th. initial temperature of iron ore particles results in a decrease in th. core-to-surface temperature difference,a slower h.ating rate,and a sh.rter duration to ach.eve *** th. factors affecting th. melting process,th. particle diameter is found to be th. most significant in terms of th. liquid ph.se precipitation,mush. zone th.ckness,and core-to-surface temperature difference of iron ore particles.

关键词： Blast furnace Iron ore melting Coh.sive zone h.at transfer Ph.se ch.nge

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Track-Pattern-Based Ch.racteristics of Extratropical Transitioning Tropical Cyclones in th. Western North.Pacific

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Advances in Atmosph.ric Sciences 2024年第6期41卷 1251-1263页

作者： h.ng h.ANG dan WU Yuan WANG Zh.n WANG Yu LIU College of Meteorology and Oceanograph. National University of Defense TechnologyChangsha 410000China No.31631 Army of PLA Huizhou 516000China Sch.ol of Atmosph.ric Sciences and Key Laboratory of Mesoscale Severe Weath.r/Ministry of Education Nanjing 210023China No.93721 Army of PLA Shuozhou 038300China

Based on th. Regional Specialized Meteorological Center(RSMC)Tokyo-Typh.on Center best-track data and th. NCEP-NCAR reanalysis dataset,extratropical transitioning(ET)tropical cyclones(ETCs)over th. western North.Pacific(WNP)during 1951–2021 are classified into six clusters using th. fuzzy c-means clustering meth.d(FCM)according to th.ir track *** ch.racteristics of th. six h.rd-clustered ETCs with.th. h.gh.st membersh.p coefficient are *** tropical cyclones(TCs)th.t were assigned to clusters C2,C5,and C6 made landfall over eastern Asian countries,wh.ch.severely th.eatened th.se *** landfalling TCs,93.2%completed th.ir ET after landfall,wh.reas 39.8%of ETCs completed th.ir transition with.n one *** frequency of ETCs over th. WNP h.s decreased in th. past four decades,wh.rein cluster C5 demonstrated a significant decrease on both.interannual and interdecadal timescales with.th. expansion and intensification of th. western Pacific subtropical h.gh.WPSh..Th.s large-scale circulation pattern is favorable for C2 and causes it to become th. dominant track pattern,owning to it containing th. largest number of intensifying ETCs among th. six clusters,a number th.t h.s increased insignificantly over th. past four *** surface rough.ess variation and th.ee-dimensional background circulation led to C5 containing th. maximum number of landfalling TCs and a minimum number of intensifying *** results will facilitate a better understanding of th. spatiotemporal distributions of ET events and associated environment background fields,wh.ch.will benefit th. effective monitoring of th.se events over th. WNP.

关键词： Western North.Pacific tropical cyclone extratropical transition fuzzy c-means clustering meth.d

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Two Indium(III)-based Fluorescent Metal-Organic Frameworks for h.gh.y Sensing Fe^(3+),2,4-DNP,and TNP

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Ch.mical Research.in Ch.nese Universities 2024年第1期40卷 119-126页

作者： WANG dan LI Wen LI Guangh.a h.A Jia LIU Yunling State Key Laboratory of Inorganic Synth.sis&Preparative Ch.mistry Jilin UniversityChangchun130012P.R.China

Two novel metal-organic frameworks(MOFs),JLU-MOF130([In(Nh.−BDC)(Imi)(1h.Imi)]·DMF·h.O,Nh.−h.BDC=2-aminobenzene-1,4-dicarboxylic acid,1h.Imi=1h.imidazole,DMF=N,N-dimeth.lformamide)and JLU-MOF131([In(1,4-NDC)(Imi)(1h.Imi)]·DMF0.5,1,4-h.(2)NDC=1,4-naph.h.lene-dicarboxylic acid),were ***-MOF130 features a th.ee-dimensional(3D)arch.tecture with.a neb ***-MOF131 is ch.racterized by a two-dimensional(2D)structure with.an sql ***-MOF130 h.s excellent fluorescence detection performance towards Fe^(3+),2,4-dinitroph.nol(2,4-DNP),and 2,4,6-trinitroph.nol(TNP),but th. fluorescence detection performance of JLU-MOF131 is furth.r improved by converting Nh.−h.BDC to more conjugated 1,4-h.(2)*** Stern-Volmer(SV)quench.ng constant(KSV)values of JLU-MOF130 sensing 2,4-DNP,TNP,and Fe^(3+)are 5.24×10^(4),4.44×10^(4),and 4.73×10^(3) L/mol,*** corresponding limit of detection(LOD)values are 1.17,1.36,and 14.59µmol/*** KSV values for JLU-MOF131 are 1.26×10^(5),9.02×10^(4),and 8.48×103 L/mol,and th. corresponding LOD values are 0.35,0.42,and 3.60µmol/L,***,th. emission wavelength. of th. two MOFs obviously sh.ft as th. fluorescence emission intensities decrease upon th. addition of 2,4-DNP and TNP,wh.ch.can be applied in selective detection.

关键词： Metal-organic framework Fluorescence quench.ng Fe^(3+) 2 4-Dinitroph.nol(2 4-DNP) 2 4 6-Trinitroph.nol(TNP)

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Nano-effect enh.nced cooperative luminescence of Yb^(3+) clusters in bulk materials

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Journal of Rare Earth. 2024年第3期42卷 473-478,I0002页

作者： Daguang Li Jiah.o Cui Yanh.i Dong h.o Cui dan Zh.o Weiping Qin State Key Laboratory on Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun130012China

In order to improve th. multi-ion cooperative transition, we proposed and exploited a novel nanoscale effect, namely th. nanosh.ll effect in bulk materials. Based on th. effect, an optimal material structure was designed by coating th. surfaces of Ca F_(2):Yb^(3+)micron size particles with.ZrO_(2). An about 2 times h.gh.r intensity of cooperative luminescence is observed upon laser excitation at 980 nm. Dynamical analysis exh.bits th.t th. novel effect plays a key role in improving th. performance of cooperative transitions. Our results also suggest th.t th. nanosh.ll effect in bulk materials is likely to be significant in some special cases, wh.ch.h.ve not been reported yet in th. literature.

关键词： Yb^(3+)cluster ZrO_(2) Nanosh.ll Enh.ncement Cooperative luminescence Rare earth.

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Ch.racterization of ph.sicoch.mical and immunogenic properties of allergenic proteins altered by food processing:a review

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Food Science and h.man Wellness 2024年第3期13卷 1135-1151页

作者： Enning Zh.u Qiangqiang Li dan Zh. Gang Ch.n Liming Wu Institute of Apicultural Research Chinese Academy of Agricultural SciencesBeijing 100093China Department of Food Science University of OtagoDunedin 9016New Zealand Sch.ol of Food and h.alth Beijing Technology and Business UniversityBeijing 100048China

Food allergens are mainly naturally-occurring proteins with.immunoglobulin E(IgE)-binding *** th. structural and immunogenic ch.racteristics of allergenic proteins is essential in assessing wh.th.r and h.w food processing tech.iques reduce *** h.re discuss th. impacts of food processing tech.ologies on th. modification of ph.sicoch.mical,structural,and immunogenic properties of allergenic *** tech.iques for ch.racterizing ch.nges in th.se properties of food allergens are *** processing h.lps to reduce allergenicity by aggregating or denaturing proteins,wh.ch.masks,modifies,or destroys antigenic epitopes,wh.reas,it cannot eliminate allergenicity completely,and sometimes even improves allergenicity by exposing new ***,most food processing tech.iques h.ve been tested on purified food allergens rath.r th.n food products due to potential interference of oth.r food *** provide guidance for furth.r development of processing operations th.t can decrease th. allergenicity of allergenic food proteins with.ut negatively impacting th. nutritional profile.

关键词： Food allergens Protein structural ch.racterization Immunogenicity evaluation Food processing modification

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Effect of Low-Temperature Th.rmal Oxidation on th. Capillary Performance of Sintered Copper Powder Wicks

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Journal of Th.rmal Science 2024年第1期33卷 29-40页

作者： Zh. Mingh.n FANG Runquan h. Yanxin Zh.NG Jiangyun Sh.O dan h.ANG Jin Sch.ol of Material and Energy Guangdong University of TechnologyGuangzhou 510006China Sch.ol of Electric Power Engineering Guangdong Polytechnic of Water Resources and Electric EngineeringGuangzhou 510006China Research.into Artifacts Guangdong Key Laboratory of Battery SafetyGuangzhou Institute of Energy testingGuangzhou 511447China

In th.s study,a composite powder capillary wick is prepared,manufactured by sintering copper powder and surface treated by low-temperature th.rmal *** is used to improve th. performance of th. capillary *** forced flow meth.d and infrared imaging meth.d are used to test th. permeability and capillary performance of th. *** effects of different oxidation temperatures on th. performance of capillary wick are *** experimental results sh.w th.t th. wetting performance of th. oxidized samples is significantly *** th. increase of oxidation temperature,th. permeability *** capillary h.igh. and velocity of th. th.rmally oxidized samples are significantly h.gh.r th.n th.se of th. untreated capillary ***,th. oxidation temperature needs to be adjusted to obtain th. best capillary *** h.gh.st capillary performance is found at oxidation temperature of 300℃,with.an increase of 46% compared to th. untreated *** with.oth.r composite wicks sh.w th.t th. sample with.an oxidation temperature of 300℃ h.s competitive capillary performance,making it a favorable alternative to two-ph.se h.at transfer *** study sh.ws th.t combining low-temperature th.rmal oxidation tech.ology with.powder sintering is a convenient and effective meth.d to improve th. capillary performance of powder wicks.

关键词： low-temperature th.rmal oxidation capillary performance copper powder permeability

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Effect of Artificial Cooling Extrusion on Microstructure and Mech.nical Properties of Mg–Zn–Y Alloys

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Acta Metallurgica Sinica(English.Letters) 2024年第7期37卷 1115-1127页

作者： Qi-Yu Liao Da-Zh. Zh.o Qi-Ch. Le Wen-Xin h. Yan-Ch.o Jiang Wei-Yang Zh.u Liang Ren dan-dan Li Zh.o-Yang Yin Sch.ol of Materials Science and Engineering Northeastern UniversityShenyang110819China Key Laboratory of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang110819China Key Laboratory of Ligh.weigh. Structural Materials Liaoning ProvinceNortheastern UniversityShenyang110819China Baotou Research.Institute of Rare Earth. Baotou014000China

Microstructure and mech.nical properties of Mg–Zn–Y alloys with.different Zn/Y atomic ratios with.or with.ut artificial cooling (AC) extrusion were systematically investigated in th.s work. Th. results sh.w th.t bimodal microstructure consisting of submicron dynamic recrystallized (DRXed) grains with.h.gh.fraction of low-angle grain boundaries (LAGBs) and elongated unDRXed grains was formed in Mg_(98.7)Zn_(1)Y_(0.3) alloy with.AC extrusion. Th. AC process effectively limits th. growth.of precipitated ph.ses, and large amount of nanoscale precipitates were dynamically precipitated during th. extrusion process. AC extrusion could effectually refine th. lamellar 14h.LPSO ph.ses and inh.bit th. transition from stacking faults to LSPO ph.ses in Mg_(98)Zn_(1)Y_(1) alloy and th. narrow LPSO ph.se in Mg_(98)Zn_(1)Y_(1)-AC alloy wh.ch.could promote th. nucleation of DRXed grains. Th. AC extrusion significantly improves th. strength.of Mg–Zn–Y alloys. Owing to AC extrusion, th. strength.improvement of Mg_(98.7)Zn_(1)Y_(0.3) alloy is mainly attributed to fine grain strength.ning, dislocation strength.ning, and nano-ph.ses precipitation strength.ning. After AC process, more fine grains and nano-ph.ses jointly strength.n th. Mg_(98)Zn_(1)Y_(1) alloy. Th. Mg_(98)Zn_(1)Y_(1) alloy obtains optimal mech.nical properties after extrusion at 623 K, with.ultimate tensile strength.(UTS) of 406 MPa, yield strength.(YS) of 388 MPa, and elongation (EL) of 5.6%.

关键词： Mg-Zn-Y Artificial cooling Extrusion Microstructure Mech.nical properties

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Security-constrained Transmission Maintenance Optimization Considering Generation and Operational Risk Costs

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Journal of Modern Power Systems and Clean Energy 2024年第3期12卷 767-781页

作者： dan Xu Zh. Cai Qian Ch.ng Guodong h.ang Jingyang Zh.u Junjie Tang Beijing Key Laboratory of Research.and System Evaluation of Power Dispatch.ng Automation Tech.ology China Electric Power Research InstituteBeijing 100192China State Key Laboratory of Power Transmission Equipment&System Security and New Tech.ology Chongqing UniversityChongqing 400044China

With.th. large-scale integration of renewable energy,th. traditional maintenance arrangement during th. load valley period cannot satisfy th. transmission demand of renewable energy ***,in a market-oriented operation mode,th. power dispatch.ng control center aims to reduce th. overall power purch.se cost wh.le ensuring th. security of th. power ***,a security-constrained transmission maintenance optimization model considering generation and operational risk costs is proposed *** model is built on double-layer optimization framework,wh.re th. upper-layer model is used for maintenance and generation planning,and th. lowerlayer model is primarily used to address th. operational security risk arising from th. random prediction error and N-1 transmission ***,a generation-maintenance iterative algorith. based on a defined cost feedback is included to increase solution *** cost is determined using long-term security-constrained unit commitment,and th. operational risk cost is obtained using a double-layer N-1 risk assessment *** electrical correlation coupling coefficient is proposed for th. solution process to avoid maintenance of associated equipment simultaneously,th.reby improving model convergence *** IEEE 118-bus system is used as a test case for illustration,and test results suggest th.t th. proposed model and algorith. can reduce th. total cost of transmission maintenance and system operation wh.le effectively improving th. solution efficiency of th. joint optimization model.

关键词： Transmission maintenance security-constrained unit commitment iterative algorith. cost feedback N−1 risk assessment

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A disk I/O optimized system for concurrent graph.processing jobs

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Frontiers of Computer Science 2024年第3期18卷 13-29页

作者： Xiangh.o XU Fang WANG h.ng JIANG Yongli Ch.NG dan FENG Peng FANG Sch.ol of Computer Science and Engineering Nanjing University of Science and TechnologyNanjing 210094China Wuh.n National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China Department of Computer Science&Engineering University of Texas at ArlingtonArlingtonTX 76019USA College of Computer and Data Science Fuzhou UniversityFuzhou 350108China Zh.jiang Lab Hangzhou 311121China

In order to analyze and process th. large graph. with.h.gh.cost efficiency,research.rs h.ve developed a number of out-of-core graph.processing systems in recent years based on just one commodity *** th. oth.r h.nd,with.th. rapidly growing need of analyzing graph. in th. real-world,graph.processing systems h.ve to efficiently h.ndle massive concurrent graph.processing(CGP)***,due to th. inh.rent design for single graph.processing job,existing out-of-core graph.processing systems usually incur unnecessary data accesses and severe competition of I/O bandwidth.wh.n h.ndling th. CGP *** th.s paper,we propose Graph.P,a disk I/O optimized out-of-core graph.processing system th.t efficiently supports th. processing of CGP *** proposes a benefit-aware sh.ring execution model to sh.re th. I/O access and processing of graph.data among th. CGP jobs and adaptively sch.dule th. graph.data loading based on th. states of vertices,wh.ch.efficiently overcomes above ch.llenges faced by existing out-of-core graph.processing ***,Graph.P adopts a dependency-based future-vertex updating model so as to reduce disk I/Os in th. future *** addition,Graph.P organizes th. graph.data with.a Source-Sorted Sub-Block graph.representation for better processing capacity and I/O access *** evaluation results sh.w th.t Graph.P is 20.5×and 8.9×faster th.n two out-of-core graph.processing systems GridGraph.and Graph.,and 3.5×and 1.7×faster th.n two state-of-art concurrent graph.processing systems Seraph.and Graph.O.

关键词： graph.processing disk I/O concurrent jobs

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Influence of ambient temperature on th. CO_(2)emitted of ligh.-duty veh.cle

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Journal of Environmental Sciences 2024年第6期140卷 59-68页

作者： dan Tan Yach.o Wang Jianwei Tan Jiach.n Li Ch.ngyu Wang Yunsh.n Ge Sch.ol of Mech.nical Engineering Beijing Institute of TechnologyBeijing 100081China

Because of global warming,people h.ve paid more attention to greenh.use gas emitted by *** quantify th. impact of temperature on veh.cle CO_(2)emissions,th.s study was conducted using th. world ligh. veh.cle test cycle on two ligh.-duty E10 gasoline veh.cles a ambient temperatures of-10,0,23,and 40℃,and found th.t CO_(2)emission factors of Veh.cle1 in th. low-speed ph.se were 22.07%and 20.22%h.gh.r th.n th.se of Veh.cle 2 at cold star and h.t start under-10℃.Th. reason was veh.cle 1 h.d a larger displacement and more friction pairs th.n veh.cle *** was th. h.gh.st CO_(2)emission at th. low-speed ph.se due to low average speed,frequent acceleration,and *** CO_(2)temperature factor and th. ambient temperature h.d a strong linear correlation(R2=0.99).According to CO_(2)temperature factors and th.ir relationsh.ps,CO_(2)emission factors of oth.r ambien temperatures could be calculated wh.n th. CO_(2)emission factor of 23℃was obtained,and th. meth.d also could be used to obtain th. CO_(2)temperature factors of different *** separate th. effect of load setting and temperature variation on CO_(2)emission quantitatively a meth.d was *** results sh.wed th.t th. load setting was dominant for th. CO_(2)emission *** with.23℃,th. CO_(2)emission for veh.cle 1 caused by load setting variation were 62.83 and 47.42 g/km,respectively at-10 and 0℃,wh.le th.se fo veh.cle 2 were 45.01 and 35.63 g/km,respectively.

关键词： CO_(2)emission Ambient temperature E10 gasoline Ligh.-duty veh.cle WLTC

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