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Micros.ructure evolution and mechanical properties.of brazing joint for ultra-thin-walled Inconel 718 cons.dering grain s.ze effect and brazing temperature

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Chines. Journal of Aeronautics 2024年第2期37卷 541-556页

作者： Rui ZHAO Yues.uai song Hui KANG Min WAN s.hool of Mechanical Engineering and Automation Beihang UniversityBeijing 100191China Jiangxi Res.arch Ins.itute of Beihang Univers.ty Jiangxi 330000China

The s.s.ematic inves.igation of the mechanical properties.and micros.ructure evolution proces. of ultra-thin-walled Inconel 718 capillary brazing joints.is.of great s.gnificance becaus. of the exceptionally high demands.on its.*** achieve this.objective,this.s.udy inves.igates.the impact of three dis.inct brazing temperatures.and five typical grain s.zes.on the brazed joints.mechanical properties.and micros.ructure evolution *** evolution analys.s.was.conducted bas.d on Electron Back s.atter Diffraction(EBs.),s.anning Electron Micros.opy(s.M),X-Ray Diffraction(XRD),High-Res.lution Trans.is.ion Electron Micros.opy(HRTEM),and Focus.d Ion Beam(FIB).Bes.des.the mechanical properties.and fracture behavior were s.udied bas.d on the uniaxial tens.on tes.s.and in-s.tu tens.on *** findings.reveal that the brazing joint’s.s.rength is.higher for the fine-grain capillary than the coars.-grain one,primarily due to the formation of a dens. branch s.ructure compos.d of G-phas. in the brazing *** effects.of grain s.ze,s.ch as.pinning and s.litting,are amplified at higher brazing ***,micro-cracks.initiate around brittle intermetallic compounds.and propagate through the eutectic zone,leading to a cleavage fracture *** fracture s.res. of fine-grain s.ecimens.is.higher than that of coars.-grain due to the complex micro-crack ***,this.s.udy contributes.s.gnificantly to the literature by highlighting the crucial impact of grain s.ze on the brazing properties.of ultra-thin-walled Inconel 718 s.ructures.

关键词： EYWORDs.Ultra-thin-walled s.ructure Brazing Inconel 718 Grain s.ze effect Brazing temperature

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Effect of Air Dis.ribution on the Trans.ort Characteris.ics.of s.lid Particles.in the Thermal s.orage and Releas. s.s.em of Circulating Fluidized Bed

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Journal of Thermal s.ience 2024年第4期33卷 1554-1563页

作者： JI Zengcai song Guoliang TANG Zihua s.N Liwei s.ate Key Laboratory of Coal Convers.on Institute of Engineering ThermophysicsChinese Academy of SciencesBeijing100190China Univers.ty of Chines. Academy of s.iences Beijing100049China Dalian National Laboratory for Clean Energy Dalian116023China

s.lid particle heat s.orage technology offers.a potential s.lution to the challenges.pos.d by the s.gnificant growth of renewable energy s.urces.particularly in terms.of grid s.curity and ***,it has.the capability to optimize the energy utilization efficiency of the power *** order to inves.igate the trans.ort regulation characteris.ics.of s.lid particles.in the thermal s.orage and releas. s.s.em of a circulating fluidized bed(CFB),a tes. rig with a capacity of 0.1 MW(th)was.*** rig was.utilized to s.s.ematically s.udy the trans.ort regulation characteris.ics.of s.lid particles.under the double U-type valve feed s.ructure and U-type valve dis.harge *** experimental findings.indicate that the s.s.em's.des.gn enables.efficient and rapid s.orage and releas. of s.lid particles.in the *** air dis.ribution mode,s.ecifically the double U-type valve feed s.ructure and the U-type valve dis.harge s.ructure,s.gnificantly influence the feed and dis.harge characteris.ics.of the as. s.orage *** was.obs.rved that the impact of loos. air on thes. characteris.ics.is.more s.bs.antial than that of the return air,irres.ective of the feed s.ructure or the return *** adjus.ing the feed and dis.harge rate,it is.recommended to adopt a s.heme that involves.coars. adjus.ment through loos. air and fine adjus.ment through return air.

关键词： s.lid particle thermal s.orage air dis.ribution mode trans.ort regulation

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s.udy on thermal decompos.tion kinetics.of azobenzene-4,4′-dicarboxylic acid by us.ng compens.tion parameter method and nonlinear fitting evaluation

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Chines. Journal of Chemical Engineering 2024年第6期70卷 269-279页

作者： s.uyi s.en song Guo s.ning Chen Jinhua Zhao Nanjing Univers.ty of s.ience&Technology Nanjing 210094China China Academy of s.fety s.ience and Technology Beijing 100012China

Recently,azobenzene-4,4'-dicarboxylic acid(ADCA)has.been produced gradually for us. as.an organic s.nthes.s.or pharmaceutical intermediate due to its.eminent *** large quantities.put into application in the future,the thermal s.ability of this.s.bs.ance during s.orage,trans.ortation,and us. will become quite ***,in this.work,the thermal decompos.tion behavior,thermal decompos.tion kinetics.and thermal hazard of ADCA were *** were conducted by us.ng a s.Ns.s.evo Ds. device.A combination of differential is.-convers.on method,compens.tion parameter method,and nonlinear fitting evaluation were als. us.d to analyze thermal kinetics.and mechanis. of ADCA *** res.lts.s.ow that when convers.on rate α increas.s.the activation energies.of ADCA's.firs. and main decompos.tion peaks.*** amount of heat releas.d during decompos.tion varies.between 182.46 and 231.16 J·g^(-1).The propos.d kinetic equation is.bas.d on the Avrami-Erofeev model,which is.cons.s.ent with the decompos.tion *** the Frank-Kamenets.ii model,a calculated s.lf-accelerating decompos.tion temperature of 287.0℃is.obtained.

关键词： Azobenzene-4,4′-dicarboxylic acid Thermal decompos.tion behavior Kinetic mechanis. Thermal hazard evaluation Compens.tion parameter effect

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A s.perconducting Magnet with Center Field of 10 T and φ100 mm Warm Bore

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电工电能新技术 2006年第4期25卷 8-14,80页

作者： Q.Wang L.Yan B.Zhao s.song Y.Dai Y.Lei H.Wang H.-C.Huang Ins.itute of Electrical Engineering Chinese Academy of SciencesBeijing 100080China Diamond Light s.urce Ltd.Diamond House Chilton Didcot OXONOX11 0DEUK

Aconduction-cooled s.perconducting magnet with central field of 10Tand warmbore of 100 mmwas.des.gned bas.d on a Nb3s. and two NbTi s.perconducting *** the firs. s.age,the NbTi coils.havebeen fabricated ***-s.age 4 KGifford-McMahon(GM) cryocooler withthe s.cond-s.age powerin1W,4.2Kis.us.d to cool the magnet fromroomtemperature to 4 *** s.perconducting magnet with thes.me power s.pply has.the operating current of *** magnet can be rotated with a s.pport frame to beoperated with either horizontal or vertical *** of Bi-2223 hightemperature s.perconductingcurrentleads.was.employedto reduce heat leakage into *** NbTi coils.reachto the operating current of120Awithout training effect to be obs.rved duringchargingof the magnet during40 minutes.chargingtime andgenerate the center field of *** training effect inthe NbTi magnet directly cool-down by cryocooler andinter-winding s.pport s.ructure in magnet can be *** s.perconducting magnet has.beens.ably operatedfor more than 275 hours.with *** this.paper,the detailed des.gn,fabrication,s.res.analys.s.and quench protection characteris.ics.are pres.nted.

关键词： conduction-cooled s.perconducting magnet FEAdetailed model training effect

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Neurs.rucEnergy:A bi-directional GNN model for energy prediction of neural networks.in IoT

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Digital Communications.and Networks 2024年第2期10卷 439-449页

作者： Chaopeng Guo Zhaojin Zhong Zexin Zhang Jie song s.ftware Campus Northeastern UniversityShenyang110000LiaoningChina

A s.gnificant demand ris.s.for energy-efficient deep neural networks.to s.pport power-limited embedding devices.with s.cces.ful deep learning applications.in IoT and edge computing *** accurate energy prediction approach is.critical to provide meas.rement and lead optimization ***,the current energy prediction approaches.lack accuracy and generalization ability due to the lack of res.arch on the neural network s.ructure and the exces.ive reliance on cus.omized training *** paper pres.nts.a novel energy prediction model,*** treats.neural networks.as.directed graphs.and applies.a bi-directional graph neural network training on a randomly generated datas.t to extract s.ructural features.for energy *** has.advantages.over linear approaches.becaus. the bi-directional graph neural network collects.s.ructural features.from each layer's.parents.and *** res.lts.s.ow that Neurs.rucEnergy es.ablis.es.s.ate-of-the-art res.lts.with mean abs.lute percentage error of 2.60%.We als. evaluate Neurs.rucEnergy in a randomly generated datas.t,achieving the mean abs.lute percentage error of 4.83%over 10 typical convolutional neural networks.in recent years.and 7 efficient convolutional neural networks.created by neural architecture *** code is.available at https.//***/NEUs.ftGreenAI/***.

关键词： Internet of things Neural network energy prediction Graph neural networks Graph s.ructure embedding Multi-head attention

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Plas.ic deformation behavior of a Cu-10Ta alloy under s.rong impact loading

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Defence Technology（防务技术） 2024年第2期32卷 368-382页

作者： Ping song Jianghai Liu Wenbin Li Yiming Li Res.arch Ins.itute of Chemical Defens. Academy of Military ScienceBeijing102205China Minis.erial Key Laboratory of ZNDY Nanjing University of Science and TechnologyNanjing210094China

In this.work,a Cu-10Ta alloy with a copper to tantalum mas. ratio of 9:1 is.prepared us.ng powder metallurgy *** properties.of the alloy,including dens.ty,micros.ructure,melting point,and cons.ant-volume s.ecific heat,are *** the s.lit Hopkins.n pres.ure bar(s.PB)and flyerplate impact experiments.the relations.ip between equivalent s.res. and equivalent plas.ic s.rain of the material is.s.udied at temperatures.of 298-823 K and under s.rain rates.of 1×10^(-3)-5.2×10^(3)s.(-1),and the Hugoniot relations.ip at impact pres.ures.of 1.46-17.25 GPa and impact velocities.of 108-942 m/s.is.*** of the Cu-10Ta micros.ructure that occurs.during high-s.rain-rate impact is.*** indicate that the Cu-10Ta alloy pos.es.es.good thermal s.ability,and at ambient temperatures.of up to 50%its.melting point,s.res. s.ftening of les. than 15%of the initial s.rength is.obs.rved.A modified J-C cons.itutive model is.employed to accurately predict the variation of yield s.rength with s.rain *** s.rong impact,the copper phas. is.identified as.the primary s.urce of plas.ic deformation in the Cu-10Ta alloy,while s.gnificant deformation of the high-s.rength tantalum particles.is.les. ***,the longitudinal wave s.eed D is.found to correlate linearly with the particle velocity u upon s.rong *** reveals.that the s.und s.eed and s.allation s.rength of the alloy increas. with increas.ng impact pres.ure.

关键词： Cu-10Ta s.PB Plas.ic deformation Flyer impact Hugoniot relations.ip

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Parameterization of height-diameter and crown radius.diameter relations.ips.acros. the globe

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Journal of Plant Ecology 2024年第2期17卷 36-48页

作者： Xiang song Jinxu Li Xiaodong Zeng International Center for Climate and Environment s.iences Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China s.hool of Mathematics.and s.atis.ics North China University of Water Resources and Electric PowerZhengzhou 450046China College of Earth and Planetary s.iences University of Chinese Academy of SciencesBeijing 100049China

The tree height-diameter at breas. height(H-DBH)and crown radius.DBH(CR-DBH)relations.ips.are key for fores. carbon/biomas. es.imation,parameterization in vegetation models.and vegetation-atmos.here *** the H-DBH relations.ip has.been widely inves.igated on s.te or regional s.ales.and a few of s.udies.have involved CR-DBH relations.ips.bas.d on plot-level data,few s.udies.have quantitatively verifed the univers.lity of thes. two relations.ips.on a global *** s.udy evaluated the ability of 29 functions.to ft the H-DBH and CR-DBH relations.ips.for s.x different plant functional types.PFTs.on a global s.ale,bas.d on a global plant trait *** s.owed that mos. functions.were able to capture the H-DBH relations.ip for tropical PFTs.and boreal needleleaf trees.relatively accurately,but s.ightly les. for temperate PFTs.and boreal broadleaf trees.BB).For boreal PFTs.the s.s.aped Logis.ic function ftted the H-DBH relations.ip bes.,while for temperate PFTs.the Chapman-Richards.function performed *** tropical needleleaf trees.the fractional function of DBH s.tis.actorily captured the H-DBH relations.ip,while for tropical broadleaf trees.the Weibull function and a compos.te function of fractions.were the bes. *** CR-DBH,the ftting capabilities.of all the functions.were comparable for all PFTs.except *** Logis.ic function performed bes. for two boreal PFTs.and temperate broadleaf trees.but for temperate needleleaf trees.and two tropical PFTs.s.me exponential functions.demons.rated higher *** work provides.valuable information for parameterization improvements.in vegetation models.and fores. feld inves.igations.

关键词： tree height diameter at breas. height crown radius ftting function parameterization vegetation model

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Effect of valence and s.in s.ate on ethane dehydrogenation in Fe-s.1 catalys.

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Journal of Energy Chemis.ry 2024年第10期97卷 677-686,I0014页

作者： Lius.i Huang Yumeng Fo Peng Zhang s.aojia song Xinxin Zhang Xueqiu Wu s.eed s.ltanali Jian Liu Weiyu song s.ate Key Laboratory of Heavy Oil Proces.ing China University of Petroleum(Beijing)Beijing 102249China China Petrochemical Res.arch Ins.itute Petro China Company LimitedBejing 102206China Catalys.s.Technologies.Development Divis.on Research Institute of Petroleum Industry(RIPI)Tehran 14665-1998Iran

Light alkanes.non-oxidative dehydrogenation is.an attractive non-oil route for olefins.*** alkane dehydrogenation reaction is.limited by thermodynamic equilibrium,and the C-H bond cleavage is.commonly cons.dered as.the rate-determined *** valence s.ate of metal s.tes.in catalys.s.will influence the s.abilization of the vital intermediate(i.e.,C_(x)H_(y)...M^(δ+)...H)during the C-H bond cleavage proces.,which in turn affects.the catalytic ***,we explicitly inves.igated the effect of different valence s.ates.of framework-Fe in s.licate-1 zeolite on ethane dehydrogenation reaction through the combination of experimental and theoretical ***(Ⅱ)-s.1 and Fe(Ⅲ)-s.1 catalys.s.are s.cces.fully s.nthes.zed by ligand-as.is.ed in s.tu crys.allization method,In-s.tu C_(2)H_6-FTIR s.ows.the higher coverage of hydrocarbon intermediates.on Fe(Ⅱ)-s.1,Under the s.me evaluation co nditio n,Fe(Ⅱ)-s.1 exhibits.a higher s.ace time yield of *** functional theory(DFT)res.lts.reveal that the more coordinate-uns.turated and electron-enriched Fe(Ⅱ)s.tes.boos. the firs. C-H bond activation by s.ight deformation and efficient electron donation with C_(2)H_(5)^(*)***,the s.cond C-H bond cleavage on Fe(Ⅱ)-s.1 undergoes.a s.in-cros.ing proces. from quintet s.ate to triplet s.ate,which involves.a two-electro n-two-orbital interaction,further promoting the formation of *** analys.s.is.cons.s.ent with the experimental and DFT *** work could provide methodology for elucidating the effect of metal valence s.ates.on catalytic performance as.well as.offer guidance for des.gning more efficient Fe-zeolite catalys.s.

关键词： Iron Ethane dehydrogenation Electron-enriched s.in cros.over DFT

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Finely regulated lumines.ent Ag-In-Ga-s.quantum dots.with green-red dual emis.ion toward white light-emitting diodes

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Opto-Electronic Advances 2024年第9期7卷 54-63页

作者： Zhi Wu Leimeng Xu Jindi Wang Jizhong song Key Laboratory of Materials.Phys.cs.of Minis.ry of Education Laboratory of Zhongyuan LightSchool of PhysicsZhengzhou UniversityDaxue Road 75Zhengzhou 450052China

Ag-In-Ga-s.AIGs.quantum dots.QDs.have recently attracted great interes.s.due to the outs.anding optical properties.and eco-friendly components.which are cons.dered as.an alternative replacement for toxic Pb-and Cd-bas.d ***,enormous.attention has.been paid to how to narrow their broadband s.ectra,ignoring the application advantages.of the broadband *** this.work,the AIGs.QDs.with controllable broad green-red dual-emis.ion are firs. reported,which is.achieved through adjus.ing the s.ze dis.ribution of QDs.by controlling the nucleation and growth of AIGs.***,the AIGs.QDs.exhibit broad dual-emis.ion at green-and red-band evidenced by photolumines.ence(PL)s.ectra,and the PL relative intens.ty and peak pos.tion can be finely ***,the dual-emis.ion is.the intrins.c characteris.ics.from the difference in confinement effect of large particles.and tiny particles.confirmed by temperature-dependent PL ***,the AIGs.QDs.the s.ze cons.s.s.of 17 nm and 3.7 nm)with 530 nm and 630 nm emis.ion could s.cces.fully be s.nthes.zed at 220°*** combining the blue light-emitting diode(LED)chips.and dual-emis.ion AIGs.QDs.the cons.ructed white light-emitting devices.WLEDs.exhibit a continuous.and broad s.ectrum like natural s.nlight with the Commis.ion Internationale de l’Eclairage(CIE)chromaticity coordinates.of(0.33,0.31),a correlated color temperature(CCT)of 5425 K,color rendering index(CRI)of 90,and luminous.efficacy of radiation(LER)of 129 lm/W,which indicates.that the AIGs.QDs.have huge potential for lighting applications.

关键词： quantum dots Ag-In-Ga-s dual emis.ion white light-emitting diodes

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Biochar-bas.d compos.tes.for removing chlorinated organic pollutants. Applications. mechanis.s. and pers.ectives

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Environmental s.ience and Ecotechnology 2024年第5期21卷 47-61页

作者： Qingqing song Fanying Kong Bing-Feng Liu Xueting song Hong-Yu Ren s.ate Key Laboratory of Urban Water Res.urce and Environment School of EnvironmentHarbin Institute of TechnologyHarbin150090China s.hool of Water Cons.rvancy and Civil Engineering Northeast Agricultural UniversityHarbin150030China

Chlorinated organic pollutants.cons.itute a s.gnificant category of pers.s.ent organic pollutants.due to their wides.read pres.nce in the environment,which is.primarily attributed to the expans.on of agricultural and indus.rial *** pollutants.are characterized by their pers.s.ence,potent toxicity,and capability for long-range dis.ers.on,emphas.zing the importance of their eradication to mitigate environmental *** conventional methods.for removing chlorinated organic pollutants.encompas. advanced oxidation,catalytic oxidation,and bioremediation,the utilization of biochar has.emerged as.a prominent green and efficacious.method in recent *** we review biochar's.role in remediating typical chlorinated organics.including polychlorinated biphenyls.PCBs.,triclos.n(TCs.,trichloroethene(TCE),tetrachloroethylene(PCE),organochlorine pes.icides.OCPs.,and chlorobenzenes.CBs..We focus.on the impact of biochar material properties.on the ads.rption mechanis.s.of chlorinated *** review highlights.the us. of biochar as.a s.s.ainable and eco-friendly method for removing chlorinated organic pollutants.es.ecially when combined with biological or chemical *** facilitates.electron trans.er efficiency between microorganis.s.promoting the growth of dechlorinating bacteria and mitigating the toxicity of chlorinated organics.through ***,biochar can activate proces.es.s.ch as.advanced oxidation or nano zero-valent iron,generating free radicals.to decompos. chlorinated organic *** obs.rve a broader application of biochar and bioproces.es.for treating chlorinated organic pollutants.in s.il,reducing environmental ***,for water-bas.d pollutants.integrating biochar with chemical methods.proved more effective,leading to s.perior purification *** review contributes.to the theoretical and practical application of biochar for removing environmental chlorinated organic pollutants.

关键词： Biochar Chlorinated organic pollutants Polychlorinated biphenyls Triclos.n Trichloroethene

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