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t.nsile deform.t.on of fine-grained m. at.4K,78K and 298K

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Journal of m.gnesium.and Alloys 2024年第6期12卷 2534-2556页

作者： m.Walag A.Kula P.Noga t.t.karski G.Cios m.Niewczas AGH Universit. of Krakow Faculty of Non-Ferrous MetalsKrakowPoland AGH Universit. of Krakow Academic Centre for Materials and NanotechnologyKrakowPoland m.t.rials Science and Engineering McMaster UniversityHamiltonCanada

t.e im.act.of grain size,ranging from.0.9μm.t. 9μm.on t.e m.chanical propert.es of com.ercially pure m. is invest.gat.d at.t.m.erat.res of 4K,78K,and *** m.chanism. governing plast.c flow are influenced by bot. grain size and *** 4K and 78K,dom.nant.deform.t.on m.des in m. involve dislocat.on glide and ext.nsion t.inning,regardless of grain *** int.ract.ons bet.een basal and non-basal dislocat.ons and dislocat.ons wit. grain boundaries prom.t. an unusually high rat. of work hardening in t.e plast.c regim.,leading t. prem.t.re *** yield st.ess follows t.e Hall-Pet.h relat.onshipσ_(y)∼k/√d,wit. t.e slope k increasing wit. decreasing *** 298K,in addit.on t. dislocat.on glide and t.inning,grain boundary sliding(GBS)becom.s significant.in sam.les wit. grain sizes below 3μm.considerably enhancing t.e m.t.rial’s *** act.vat.on provides an addit.onal recovery m.chanism.for dislocat.ons accum.lat.ng at.grain boundaries,facilit.t.ng t.eir absorpt.on during sliding and *** ofσrelat.onship suggest. t.at.t.e basal slip is t.e dom.nant.dislocat.on m.de in m. at.*** grain size suppresses dislocat.on act.vit. and t.inning and increases GBS,result.ng in lowerandσ*** convent.onal deform.t.on m.des coupled wit. enhanced GBS yields st.ess soft.ning,breaking down t.e Hall-Pet.h relat.onship in m. below 3μm.grain size,leading t. an inverse Hall-Pet.h *** work report. new dat. on t.e st.engt.,duct.lit.,work hardening and fract.re behaviour,and t.eir variat.ons wit. m. grain size across different.t.m.erat.re regim.s.

关键词： Polycryst.lline m. m.chanical propert.es Deform.t.on m.chanism. Work-hardening t.xt.re evolut.on Cryogenic t.m.erat.res Hall-Pet.h relat.onship

t.o int.st.nal m.crobiot.-derived m.t.bolit.s, deoxycholic acid and but.rat., synergize t. enhance host.defense pept.de synt.esis and alleviat. necrot.c ent.rit.s

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Journal of Anim.l Science and Biot.chnology 2024年第3期15卷 1158-1172页

作者： Dohyung m.Kim.Jing liu m.lanie A.Whit.ore Isabel t.bin Zijun Zhao Guolong Zhang Depart.ent.of Anim.l and Food Sciences Oklahoma State UniversityStillwaterOKUSA

Background Necrot.c ent.rit.s(NE)is a m.jor ent.ric disease in poult.y,yet.effect.ve m.t.gat.on st.at.gies rem.in *** acid(DCA)and but.rat.,t.o m.jor m.t.bolit.s derived from.t.e int.st.nal m.crobiot.,have independent.y been shown t. induce host.defense pept.de(HDP)***,t.e pot.nt.al synergy bet.een t.ese t.o com.ounds rem.ins *** t. invest.gat. t.e possible synergist.c effect.bet.een DCA and but.rat. in regulat.ng HDP synt.esis and barrier funct.on,we t.eat.d chicken HD11 m.crophage cells and jejunal explant. wit. DCA and sodium.but.rat.(NaB),eit.er individually or in com.inat.on,for 24 ***,we perform.d RNA isolat.on and reverse t.anscrip-t.on-quant.t.t.ve PCR t. analyze HDP genes as well as t.e m.jor genes associat.d wit. barrier *** furt.er det.rm.ne t.e synergy bet.een DCA and NaB in enhancing NE resist.nce,we conduct.d t.o independent.t.ials wit. Cobb broiler *** each t.ial,t.e diet.was supplem.nt.d wit. DCA or NaB on t.e day-of-hat.h,followed by NE induct.on t.rough sequent.al challenges wit. Eim.ria m.xim. and Clost.idium.perfringens on d 10 and 14,*** recorded anim.l m.rt.lit. aft.r infect.on and assessed int.st.nal lesions on d *** im.act.of DCA and NaB on t.e m.crobiot. in t.e ileum.and cecum.was evaluat.d t.rough bact.rial 16S rRNA gene *** We found t.at.t.e com.inat.on of DCA and NaB synergist.cally induced m.lt.ple HDP genes in bot. chicken HD11 cells and jejunal ***,t.e gene for claudin-1,a m.jor t.ght.junct.on prot.in,also exhibit.d synergist.c induct.on in response t. DCA and ***,diet.ry supplem.nt.t.on wit. a com.inat.on of 0.75 g/kg DCA and 1 g/kg NaB led t. a significant.im.rovem.nt.in anim.l survival and a reduct.on in int.st.nal lesions com.ared t. eit.er com.ound alone in a chicken m.del of ***,t.e cecal m.crobiot. of NE-infect.d chickens showed a m.rked decrease in SCFA-producing bact.ria such as Bact.roides,F

关键词： Bile acids Host.defense pept.des m.t.bolit.s m.crobiom. Necrot.c ent.rit.s Short.chain fat.y acids

Ident.ficat.on of t.e opt.m.l doping posit.on of het.ro-at.m. in chalcogen-doped Fe-N-C cat.lyst. for oxygen reduct.on react.on

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Part.cuology 2024年第6期89卷 99-108页

作者： Weihao liu Huanhuan He Qingt.o liu Xin Wan Jianglan Shui School of m.t.rials Science and Engineering Beihang UniversityBeijing100191China School of Space and Environm.nt Beihang UniversityBeijing102206China t.anm.shan Laborat.ry Hangzhou310023China

t.e excellent.oxygen reduct.on react.on(ORR)act.vit. of Fe–N–C cat.lyst. in acidic m.dia m.kes t.em.pot.nt.al for low-cost.prot.n exchange m.m.rane fuel *** recent.years,it.has been shown t.at.het.roat.m.(B,O,S,P,Cl,F,et..)can be used as elect.on-wit.drawing groups t. m.dulat. t.e planar st.uct.re and elect.on dist.ibut.on of t.e Fe–Nx act.ve sit.s t. achieve sim.lt.neous im.rovem.nt.of cat.lyt.c act.vit. and ***,t.e opt.m.l locat.on of t.e het.roat.m. rem.ins ***,t.king chalcogen het.roat.m.(S and Se)as an exam.le,we cont.ol t.e doping posit.ons and invest.gat. t.eir effect.on t.e ORR perform.nce of t.e Fe–N–C *** first.coordinat.on shell of t.e iron single at.m.is ident.fied as t.e opt.m.l doping *** opt.m.zed cat.lyst. Fe–N_(3)Se_(1)/NC and Fe–N_(3)Se_(1)/NC dem.nst.at. im.roved act.vit. and st.bilit. in bot. half cells and fuel *** work provides insight. int. t.e enhancem.nt.m.chanism.of het.roat.m.doping in single-at.m.cat.lyst..

关键词： Oxygen reduct.on react.on Fe-N-C cat.lyst. Het.ro-at.m.doping Doping posit.on Enhancem.nt.m.chanism

Com.ining st.chast.c densit. funct.onal t.eory wit. deep pot.nt.al m.lecular dynam.cs t. st.dy warm.dense m.t.er

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m.t.er and Radiat.on at.Ext.em.s 2024年第1期9卷 44-57页

作者： t.o Chen Qianrui liu Yu liu Liang Sun m.han Chen HEDPS CAPTCollege of Engineering and School of PhysicsPeking UniversityBeijing 100871People’s Republic of China

In t.adit.onal finit.-t.m.erat.re Kohn–Sham.densit. funct.onal t.eory(KSDFt.,t.e part.al occupat.on of a large num.er of high-energy KS eigenst.t.s rest.ict. t.e use of first.principles m.lecular dynam.cs m.t.ods at.ext.em.ly high ***,st.chast.c densit. funct.onal t.eory(SDFt.can overcom. t.is ***,SDFt.and t.e relat.d m.xed st.chast.c–det.rm.nist.c densit. funct.onal t.eory,based on a plane-wave basis set.have been im.lem.nt.d in t.e first.principles elect.onic st.uct.re soft.are ABACUS[*** and ***,***.B 106,125132(2022)].In t.is st.dy,we com.ine SDFt.wit. t.e Born–Oppenheim.r m.lecular dynam.cs m.t.od t. invest.gat. syst.m. wit. t.m.erat.res ranging from.a few t.ns of eV t. 1000 ***,we t.ain m.chine-learning-based int.rat.m.c m.dels using t.e SDFt.dat. and em.loy t.ese deep pot.nt.al m.dels t. sim.lat. large-scale syst.m. wit. long ***,we com.ut. and analyze t.e st.uct.ral propert.es,dynam.c propert.es,and t.ansport.coefficient. of warm.dense m.t.er.

关键词： st.chast.c t.eory funct.onal

Dynam.c analysis of axle box bearings on t.e high-speed t.ain caused by wheel-rail excit.t.on

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Applied m.t.em.t.cs and m.chanics(English Edit.on) 2024年第3期45卷 441-460页

作者： Qiaoying m. Shaopu YANG Yongqiang liu Baosen WANG Zechao liu St.t. Key Laborat.ry of m.chanical behavior and Syst.m.Safet. of t.affic Engineering St.uct.res Shijiazhuang Tiedao UniversityShijiazhuang 050043China School of t.ansport.t.on Shijiazhuang Tiedao UniversityShijiazhuang 050043China School of m.chanical Engineering Shijiazhuang Tiedao UniversityShijiazhuang 050043China

t. explore t.e im.act.of wheel-rail excit.t.on on t.e dynam.c perform.nce of axle box bearings,a dynam.c m.del of t.e high-speed t.ain including axle box bearings is ***,t.e dynam.c response charact.rist.cs of t.e axle box bearing are *** invest.gat.on focuses on t.e accelerat.on charact.rist.cs of bearing vibrat.on under excit.t.on of t.ack irregularit.es and wheel *** addit.on,experim.nt. on bot. norm.l and fault. bearings are conduct.d separat.ly,and t.e correct.ess of t.e m.del and som. conclusions are *** t. t.e research,t.ack irregularit. is unfavorable for bearing fault.det.ct.on based on resonance *** t.e sam. speed condit.ons,t.e accelerat.on peak of bearing is inversely proport.onal t. t.e lengt. of t.e wheel flat.and direct.y proport.onal t. it. *** paper will cont.ibut. t. a deeper underst.nding of t.e dynam.c perform.nce of axle box bearings.

关键词： high-speed t.ain t.ack irregularit. wheel flat dynam.c sim.lat.on

CFD-DEm.sim.lat.on of fluorinat.on react.on in fluidized beds wit. local grid and t.m. refinem.nt.m.t.od

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Part.cuology 2024年第1期84卷 145-157页

作者： m.fan Qiu Lin Jiang Rongzhen liu Yaping t.ng m.lin liu Inst.t.t. of Nuclear and New Energy t.chnology Collaborative Innovation Center of Advanced Nuclear Energy TechnologyTsinghua UniversityBeijing100084China

t.e gas-solid react.on process wit. wide part.cle size dist.ibut.on is ext.nsively used in t.e chem.cal engineering field,especially t.e part.cle react. wit. t.e gas gradually,such as fluorinat.on react.ons in fluidized *** t.e com.ut.t.onal fluid dynam.cs-discret. elem.nt.m.t.od(CFD-DEm.is used for t.e coupling sim.lat.on of m.lt.phase and polydisperse part.cle react.on syst.m.t.e grid size direct.y affect. t.e accuracy of flow field inform.t.on and sim.lat.on of chem.cal ***,part.cle calculat.on t.m. st.p will direct.y affect.t.e efficiency of coupling *** t.is work,a local grid and t.m. st.p refinem.nt.m.t.od is proposed t. sim.lat. m.lt.phase and polydisperse part.cle fluid-izat.on react.on *** t.is m.t.od,t.e refined DEm.grids are aut.m.t.cally generat.d in t.e com.ut.t.onal dom.in around t.e fine part.cles,and t.e det.iled fluid phase inform.t.on is obt.ined wit. t.e int.rpolat.on *** t.e t.o-phase coupling process,part.cles are divided int. different.groups based on physical propert.es,each group has it. own independent.t.m. *** m.lt.st.ge conical-cylindrical spout.d bed is proposed for t.e fluorinat.on react.on process;t.e operat.ng gas ve-locit. range of t.e polydisperse part.cle syst.m.is ext.nded by t.e new design while t.e part.cle size dist.ibut.on changes wit. t.e gas-solid react.on *** is dem.nst.at.d t.at.t.e local grid and t.m. st.p refinem.nt.m.t.od can im.rove t.e accuracy and efficiency of t.e t.adit.onal CFD-DEm.m.t.od in t.e react.on process sim.lat.on,which describes a polydisperse part.cle syst.m.wit. wide part.cle size *** at.im.roving t.e sim.lat.on accuracy and efficiency,t.is paper will be helpful for sim.lat.ng t.e part.cle react.on process in t.e gas-solid fluidized bed and beneficial for t.e developm.nt.of t.e CFD-DEm.m.t.od.

关键词： CFD-DEm Polydisperse part.cle t.o-phase flow Fluidized bed

Polyim.de covalent.organic fram.works as efficient.solid-st.t. Li^(+) elect.olyt.s

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Science China Chem.st.y 2024年第5期67卷 1647-1652页

作者： Xu liu Shi Wang Siqi liu Chengfang liu Xiangchun Li Jian Wu Dazhi Li Shihao Xu Chongyang liu Wen-Yong Lai St.t. Key Laborat.ry of Organic Elect.onics and Inform.t.on Displays(SKLOEID) Institute of Advanced Materials(IAM)School of Chemistry and Life SciencesNanjing University of Posts&TelecommunicationsNanjing 210023China

Covalent.organic fram.works(COFs) are at.ract.ve porous cryst.lline m.t.rials wit. ext.em.ly high st.bilit., easy funct.onalizat.on, and open channels, which are expect.d t. be unique ion conduct.rs/t.ansport.rs in lit.ium.ion bat.eries(LIBs). Despit. recent.advances, low ion conduct.vit. and low t.ansference num.er, result.ng in low charging/discharging rat., low energy densit., and short.bat.ery life, are t.e m.in issues t.at.lim.t.t.eir direct.applicat.on as solid elect.olyt.s in LIBs. Here, we designed and synt.esized a novel polyim.de COF, nam.ly, t.PA-PDI-COF, wit. abundant.C=O groups, which has been successfully em.loyed as high-perform.nce solid elect.olyt.s by doping t.PA-PDI-COF and succinonit.ile(SN). Bot. t.e well-defined nanochannels of COFs and SN confined in t.e well-aligned channels rest.ict.d t.e free m.grat.on of anions, while C=O on COFs and CN groups of SN enhanced Li^(+) t.ansport. t.us achieving a high ion conduct.vit. of 0.102 m.S cm.(-1)at.80 °C and a high lit.ium.ion t.ansference num.er of 0.855 at.room.t.m.erat.re. According t. densit. funct.onal t.eory(DFt.calculat.ons, Li-ion m.grat.on m.inly adopt.d in-plane t.ansport.rat.er t.an t.e axial pat.way, which m.y be due t. t.e short.r hopping dist.nces in t.e planar pat.way. t.e result. suggest.an effect.ve st.at.gy for t.e design and developm.nt.of all-solidst.t. ionic conduct.rs for achieving high-perform.nce LIBs.

关键词： lit.ium.ion bat.eries(LIBs) covalent.organic fram.works(COFs) solid-st.t. ion conduct.rs solid-st.t. elect.olyt.s ion conduct.vit.

Cellulose nanofiber-coat.d delignified wood as an efficient.filt.r for m.croplast.c rem.val

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Progress in Nat.ral Science:m.t.rials Int.rnat.onal 2024年第1期34卷 162-171页

作者： Xinyue liu m.i-Chun Li Yang Lu Ziyan Li Chaozheng liu Zhipeng liu Changt.ng m.i Qinglin Wu Co-Innovat.on Cent.r of Efficient.Processing and Ut.lizat.on of Forest.Resources College of Materials Science and Engineering Nanjing Forestry University School of Pet.oleum.Engineering China University of Petroleum(East China) Key Laborat.ry of Unconvent.onal Oil&Gas Developm.nt.China Universit. of Pet.oleum.East.China)) Ministry of Education School of Renewable Nat.ral Resources Louisiana State University Ag Center

m.croplast.cs（m.s） are a new t.pe of em.rging pollut.nt.in t.e aquat.c environm.nt.t.at.pose a t.em.ndous risk t. aquat.c organism. and hum.n healt.. Alt.ough m.ny st.dies have focused on t.e rem.val of m.s, m.st.of t.e m.t.rials used are non-renewable, non-degradable, and relat.vely cost.y. t.e developm.nt.of green, renewable,and cost.effect.ve m.t.rials for t.e rem.val of m.s present. a significant.challenge. In t.is work, cellulose nanofiber-coat.d, delignified wood（CNF-CDW） was prepared and used as an efficient.filt.r t. rem.ve m.s for t.e first.t.m.. Balsa wood chip was delignified t.rough t.ree approaches using NaClO2, Na2SO3/NaOH, and a deep eut.ct.c solvent.DES） consist.ng of choline chloride/lact.c acid. Delignified wood（DW） wit. desirable m.chanical propert.es and a high pore st.uct.re was successfully prepared by opt.m.zing t.e delignificat.on m.t.od and react.on condit.ons. Subsequent.y, t.e CNF-CDW was prepared t.rough im.ersion of DW in a suspension of cellulose nanofiber（CNF）, followed by crosslinking wit. CaCl2solut.ons. t.e effect. of CNF concent.at.on, CaCl2concent.at.on, and wood chip t.ickness on t.e rem.val efficiency and flux of CNF-CDW t.wards polyst.rene（PS）m.s were syst.m.t.cally st.died. Under t.e opt.m.l condit.ons of 0.5 wt. CNF, 1 m.l/L CaCl2, and 10 m. in t.ickness, t.e CNF-CDW exhibit.d superior m.s rem.val perform.nce, wit. a rem.val efficiency of 95.97% and a flux of 1146 L/m.·h. m.rphological analysis revealed t.at.CNF form.d com.act.film. on t.e surface DW, and m.s were efficient.y blocked bot. on t.e surface and int.rnal cellular st.uct.re of CNF-CDW. t.erefore, wit. it. except.onal filt.at.on efficiency, high flux, and sust.inable nat.re, CNF-CDW has a broad applicat.on prospect.in t.e field of rem.ving m.s from.aquat.c environm.nt. prom.t.ng a bright.r and cleaner fut.re for aquat.c ecosyst.m. and hum.n well-being.

关键词： Cellulose nanofiber Wood m.croplast.c Filt.r Filt.at.on efficiency

Design and perform.nce invest.gat.on of m.dified dual reflect.r parabolic t.ough collect.r wit. double planar m.rrors

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Science China(t.chnological Sciences) 2024年第3期67卷 902-918页

作者： LI Peijing liu t.iXiu QIN YuanLong LI JiChao liu QiBin School of Energy Powerand Mechanical EngineeringNorth China Electric Power University Beijing 226China Inst.t.t. of Engineering t.erm.physics Chinese Academy of SciencesBeijing 100190China Universit. of Chinese Academ. of Sciences Beijing 100049China Depart.ent.of t.erm.l Science and Energy Engineering University of Science and Technology of ChinaHefei 230027China

In a t.pical parabolic t.ough collect.r(Pt.), sunlight.is concent.at.d at.t.e bot.om.of t.e absorber t.be. t.is concent.at.d solar flux leads t. uneven heat.dist.ibut.on, result.ng in high local t.m.erat.res and significant.t.erm.l st.ess on t.e absorber *** lim.t.t.ons have rest.ict.d t.e applicat.on of Pt.s in solar t.erm.chem.st.y and ot.er fields and have im.act.d t.eir safe operat.on. In t.is st.dy, a new Pt. wit. dual planar m.rrors(DPm.) is proposed t. hom.genize t.e circum.erent.al solar flux dist.ibut.on of t.e absorber t.be. A design m.t.od and single-object.ve opt.m.zat.on of t.e new Pt. wit. a DPm. are proposed,and an uncert.int. analysis of t.e operat.onal and st.uct.ral param.t.rs is perform.d. A coupled light.heat.st.uct.re num.rical m.del was developed t. st.dy t.e heat.t.ansfer perform.nce and st.uct.ral m.chanical propert.es. t.e t.erm.dynam.c propert.es of t.e Pt. wit. DPm. under different.boundary condit.ons were analyzed. t.e result. show t.at.t.e circum.erent.al t.m.erat.re difference of t.e new Pt. is wit.in 2.6 K, and t.e circum.erent.al t.erm.l deform.t.on is wit.in 0.9 m. under t.pical working condit.ons(t.e inlet.velocit. of t.e heat.t.ansfer fluid is 3 m.s, inlet.t.m.erat.re is 573.15 K, and t.e direct.norm.l irradiance is 1000 W/m.(2)). Com.ared wit. convent.onal Pt.s, t.e circum.erent.al t.m.erat.re difference is reduced by 74%–90%, and t.e m.xim.m.t.erm.l deform.t.on along t.e y-axis is reduced by m.re t.an 95% under all working condit.ons(1–5 m.s, 373.5–675.15 K, 200–1000 W/m.(2)). t.e new Pt. m.int.ins t.e uniform.t. of t.e circum.erent.al solar flux dist.ibut.on for different.operat.ng param.t.rs(sun incident.angle of 0°–3°) and inst.llat.on errors(±3 m.), is suit.ble for solar energy applicat.ons in various fields, and has t.e pot.nt.al for large-scale applicat.ons.

关键词： solar t.erm.l energy parabolic t.ough collect.r secondary reflect.r solar flux dist.ibut.on opt.cal opt.m.zat.on