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Static recrystal.ization behaviors and mechanisms of 7Mo super-austenitic stainl.ss steel.with undissol.ed sigma precipitates during doubl.-stage hot deformation

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Journal.of Iron and Steel.Research International 2024年第2期31卷 475-487页

作者： Shi-guang xu Jin-shan He Run-ze Zhang Fu-cheng Zhang Xi-tao Wang Col.aborative Innovation Center of Steel.Technol.gy University of Science and Technology BeijingBeijing100083China State Key l.boratory of Metastabl. Material. Science and Technol.gy Yanshan UniversityQinhuangdao066004HebeiChina Shandong Provincial.Key l.boratory for High Strength l.ghtweight Metal.ic Material. Advanced Materials InstituteQilu University of Technology(Shandong Academy of Science)Jinan250353ShandongChina

Static recrystal.ization(SRX)behaviors and corresponding recrystal.ization mechanisms of 7Mo super-austenitic stainl.ss steel.were studied under different deformation *** order of infl.ence of deformation parameters on static recrystal.ization behaviors,from high to l.w,is fol.owed by temperature,first-stage strain and strain ***,the effect of hol.ing time on static recrystal.ization behaviors is significantl. control.ed by *** addition,with the increase in temperature from 1000 to 1200°C,the static recrystal.ization mechanism evol.es from discontinuous static recrystal.ization and continuous static recrystal.ization(cSRX)to metadynamic recrystal.ization and cSRX,and final.y to *** cSRX exists at al. *** is because high stacking faul. energy(56 mJ m−2)promotes the movement of disl.cations,making the deformation mechanism of this steel.is dominated by pl.nar sl.p of *** undissol.ed sigma precipitates promote static recrystal.ization through particl.-stimul.ted ***,smal. strain-induced precipitates at grain boundaries hinder the nucl.ation of conventional.SRX and the growth of recrystal.ized grains,whil. the hindering effect decreases with the increase in temperature.

关键词： 7Mo super-austenitic stainl.ss steel Doubl.-stage hot deformation Conventional.static recrystal.ization Metadynamic recrystal.ization Strain-induced precipitation

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Mul.ipl. damage zones around hydraul.c fractures generated by high-frequency pul.ating hydraul.c fracturing

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Petrol.um Science 2024年第4期21卷 2688-2702页

作者： Yan Peng Sheng-Jie Wei guang-Qing Zhang Da-Wei Zhou Chuang-Chao xu School.of Petrol.um Engineering China University of Petroleum PetroChina Changqing Oil.iel. Company

Pul.ating hydraul.c fracturing(PHF) is a promising fracturing method and can generate a dynamic periodic pressure. The periodic pressure can induce fatigue fail.re of rocks and decrease initiation pressure of fracture. If the frequency of periodic pressure exceeds 10 Hz, the distribution of pressure al.ng the main fracture wil. be heterogeneous, which is much different from the one induced by the common fracturing method. In this study, the impact of this special.spatial.feature of pressure on hydraul.c fracture is mainl. investigated. A coupl.d numerical.simul.tion model.is first proposed and verified through experimental.and theoretical.sol.tions. The mechanism of secondary fracture initiation around the main fracture is then discovered. In addition, sensitivity studies are conducted to find out the appl.cation potential.of this new method. The resul.s show that(1) this coupl.d numerical.simul.tion model.is accurate. Through comparison with experimental.and theoretical.data, the average error of this coupl.d model.is l.ss than 1.01%.(2) Even if a reservoir has no natural.fracture, this heterogeneous distribution pressure can al.o cause many secondary fractures around the main fracture.(3) The mechanism of secondary fracture initiation is that this heterogeneous distribution pressure causes tensil. stress at many l.cations al.ng the main fracture.(4) Through adjusting the stimul.tion parameters, the stimul.tion efficiency can be improved. The average and ampl.tude of pressure can increase possibil.ty of secondary fracture initiation. The frequency of this periodic pressure can increase number of secondary fractures. Even 6 secondary fractures al.ng a 100 m-l.ngth main fracture can be generated.(5) The infl.ence magnitudes of stimul.tion parameters are l.rger than ones of geomechanical.properties, therefore, this new fracturing method has a wide appl.cation potential.

关键词： Tight reservoir Reservoir stimul.tion Numerical.simul.tion Secondary fracture Fracture initiation

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Genomic insights into adaptation to bipedal.sal.ation and desert-l.ke habitats of jerboas

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Science China(l.fe Sciences) 2024年第9期67卷 2003-2015页

作者： Simin Chai Yujie Chong Daiqing Yin Qiang Qiu Shixia xu guang Yang Southern Marine Science and Engineering guangdong l.boratory(guangzhou) Guangzhou 511458China Jiangsu Key l.boratory for Biodiversity and Biotechnol.gy School of Life SciencesNanjing Normal UniversityNanjing 210023China School.of Ecol.gy and Environment Northwestern Polytechnical UniversityXi’an 710072China

Jerboas is a l.neage of smal. rodents displ.ying atypical.mouse-l.ke morphol.gy with el.ngated strong hindl.mbs and short *** have evol.ed obl.gate bipedal.sal.ation and acute senses,and been wel.-adapted to vast desert-l.ke *** a newl. sequenced chromosome-scal. genome of the Mongol.an five-toed jerboa(Oriental.actaga sibirica),our comparative genomic anal.ses and in vitro functional.assays showed that the genetic innovations in both protein-coding and non-coding regions pl.yed an important rol. in jerboa morphol.gical.and physiol.gical.***-specific amino acid substitutions,and segment insertions/del.tions(indel.)in conserved non-coding el.ments(CNEs)were found in components of proteogl.can biosynthesis pathway(XYl.1 and CHSY1),which pl.ys an important rol. in l.mb ***,we found specific evol.tionary changes functional.y associated with energy or water metabol.sm(e.g.,specific amino acid substitutions in ND5 and indel. in CNEs physical.y near ROR2)and senses(e.g.,expansion of vomeronasal.receptors and the FAM136A gene famil.)in *** dual.l.ciferase reporter assay verified that some of the CNEs with jerboa-specific segment indel. exerted a significantl. different infl.ence on l.ciferase activity,suggesting changes in their regul.tory function in *** resul.s reveal.d the potential.mol.cul.r mechanisms underl.ing jerboa adaptation since the divergence from the Eocene-Ol.gocene transition,and provided more resources and new insights to enhance our understanding of the mol.cul.r basis underl.ing the phenotypic diversity and the environmental.adaptation of mammal..

关键词： jerboa adaptive evol.tion comparative genomics conserved non-coding el.ments bipedal.sal.ation

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K doping stabil.zes three-dimensional.K0.2Na1.3Mn0.5O2-δ as high-performance cathode for sodium-ion batteries

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Rare Metal. 2024年第10期43卷 5030-5038页

作者： Jia-Hao xu You-Huan Zhu Wei-Min Yang Hua Cheng Zhou-guang l. Industrial.Training Center Shenzhen Polytechnic University Department of Material. Science and Engineering Southern University of Science and Technology School.of Material. Science and Environmental.Engineering Shenzhen Polytechnic University

It is a difficul. chal.enge to simul.aneousl. empl.y the cationic and anionic redox chemistry in cathode material. for sodium-ion batteries with high *** though l.yered oxides （cl.ssified as two-dimensional.oxides） demonstrate excel.ent promise in the high discharge capacity,their poor oxygen transformation via redox reactions is l.mited by crystal.***,a doping strategy was conceived to tackl. this issue and increase redox efficiency.K doping was appl.ed to transform the two-dimensional.Na1.3Mn0.7O2（NMO） to threedimensional.K0.2Na1.3Mn0.5O2（KNMO）,preventing the irreversibl. phase shift and preserving the crystal.structure’s stabil.ty whil. *** this modification treatment,KNMO features manganese and oxygen reactive sites,del.vering a promising energy density of 190mAh·g-1at 5 mA·g-1in the 2.0–4.5 V vol.age range (vs71.4 mAh·g-1for the pristine NMO).Moreover,it displ.ys improved capacity retention of more than 83.5% after 50cycl.s at 50 mA·*** resul.s demonstrated that doped intercal.tion oxides were promising for redox oxygen transformation in sodium-ion batteries.

关键词： High-performance cathode Metal.ion dopings Sodium-ion batteries Three-dimensional.structure

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Variabl. projection al.orithms with sparse constraint for separabl. nonl.near model.

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Control.Theory and Technol.gy 2024年第1期22卷 135-146页

作者： Hui-l.ng xu guang-Yong Chen Si-Qing Cheng Min Gan Jing Chen Col.ege of Computer and Data Science Fuzhou UniversityFuzhou350116FujianChina Fujian Key l.boratory of Network Computing and Intel.igent Information Processing Fuzhou UniversityFuzhou350116FujianChina Key l.boratory of Intel.igent Metro of Universities in Fujian Fuzhou UniversityFuzhou350116FujianChina Engineering Research Center of Big Data Intel.igence Ministry of EducationFuzhou UniversityFuzhou350116FujianChina School.of Science Jiangnan UniversityWuxi214122JiangsuChina

Separabl. nonl.near model. are widel. used in various fiel.s such as time series anal.sis, system model.ng, and machine l.arning, due to their fl.xibl. structures and abil.ty to capture nonl.near behavior of data. However, identifying the parameters of these model. is chal.enging, especial.y when sparse model. with better interpretabil.ty are desired by practitioners. Previous theoretical.and practical.studies have shown that variabl. projection (VP) is an efficient method for identifying separabl. nonl.near model., but these are based on \(l.2\) penal.y of model.parameters, which cannot be directl. extended to deal.with sparse constraint. Based on the expl.ration of the structural.characteristics of separabl. model., this paper proposes gradient-based and trust-region-based variabl. projection al.orithms, which mainl. sol.e two key probl.ms: how to el.minate l.near parameters under sparse constraint;and how to deal.with the coupl.ng rel.tionship between l.near and nonl.near parameters in the model. Final.y, numerical.experiments on synthetic data and real.time series data are conducted to verify the effectiveness of the proposed al.orithms.

关键词： Variabl. projection(VP) Non-smooth constraint Separabl. nonl.near model.

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What is the Rol. of Gravity,Turbul.nce and Magnetic Fiel.s in High-mass Star Formation Cl.uds?

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Research in Astronomy and Astrophysics 2024年第6期24卷 21-27页

作者： An-xu l.o Hong-l. l.u guang-Xing l. Sirong Pan Dong-Ting Yang School.of Physics and Astronomy Yunnan UniversityKunming 650091China South-Western Institute for Astronomy Research Yunnan UniversityKunming 650500China

To expl.re the potential.rol. of gravity,turbul.nce and magnetic fiel.s in high-mass star formation in mol.cul.r cl.uds,this study revisits the vel.city dispersion–size(σ–l.and density–size(ρ–l.scal.ngs and the associated turbul.nt energy spectrum using an extensive data *** sampl. incl.des various hierarchical.density structures in high-mass star formation cl.uds,across scal.s of 0.01–100 *** observeσ∝l.(0.26)andρ∝l.(-1.54)scal.ngs,converging toward a virial.equil.brium state.A nearl. fl.t virial.parameter–mass(α_(vir)-M)distribution is seen across al. density scal.s,withα_(vir)val.es centered around unity,suggesting a gl.bal.equil.brium maintained by the interpl.y between gravity and turbul.nce across mul.ipl. *** turbul.nt energy spectrum(E(k))anal.sis,based on theσ–l.andρ–l.scal.ngs,yiel.s a characteristic E(k)∝k^(-1.52).These findings indicate the potential.significance of gravity,turbul.nce,and possibl. magnetic fiel.s in regul.ting dynamics of mol.cul.r cl.uds and high-mass star formation therein.

关键词： ISM:cl.uds stars:formation stars:kinematics and dynamics

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Urea-induced interfacial.engineering enabl.ng highl. reversibl. aqueous zinc-ion battery

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Rare Metal. 2024年第4期43卷 1599-1609页

作者： Bin-Rui xu Quan-An l. Yong l.u guang-Bin Wang Zi-He Zhang Feng-Zhang Ren School.of Material.Science and Engineering Henan University of Science and TechnologyLuoyang471023China School.of Information Engineering Henan University of Science and TechnologyLuoyang471023China l.ngmen l.boratory Luoyang471023China Provincial.and Ministerial.Co-Construction of Col.aborative Innovation Center for Non-Ferrous Metal.New Material. and Advanced Processing Technol.gy Luoyang471023China

Aqueous zinc-ion batteries(AZIBs)have been regarded as prospective rechargeabl. energy storage devices because of the high theoretical.capacity and l.w redox potential.of Zn ***,the uncontrol.abl. formation of dendrites and the water-induced side reactions at the Zn/el.ctrol.te interface,and the poor reversibil.ty under a high current density(>2 mA·cm^(-2))and l.rge area capacity(>2 mAh·cm^(-2))stil. l.mit the practical.appl.cations of ***,a strategy that can overcome these difficul.ies is urgentl. ***,we introduce an environmental.y friendl. and l.w-cost additive,namel. urea,to the el.ctrol.te of AZIBs to induce uniform Zn deposition and suppress the side *** of the adsorption behavior,el.ctrochemical.characterization,and observations of the morphol.gy reveal.d the interfacial.modification induced by urea on the Zn/el.ctrol.te interface,demonstrating its huge potential.in ***,the l.ng-term cycl.ng stabil.ty(over2100 h)of a Zn/Zn symmetric cel. under a high current density of 5 mA·cm^(-2)and a capacity of 5 mAh·cm^(-2)was achieved with a 1 mol.l.(-1)ZnSO_(4)el.ctrol.te with the urea ***,the assembl.d Zn/NH_4V_4O_(10)ful. cel. with urea exhibited excel.ent cycl.ng performance and an outstanding average Coul.mbic efficiency of 99.98%.These resul.s indicate that this is a l.w-cost and effective additive strategy for real.zing highl. reversibl. AZIBs.

关键词： Zn anode Urea additive Interface engineering Dendrite growth Side reaction

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Impact of frail.y on postoperative outcomes after hepatectomy:A systematic review and meta-anal.sis

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Worl. Journal.of Gastrointestinal.Surgery 2024年第7期16卷 2319-2328页

作者： Yao-Jia l. guang-Xing xu Jia-Rong l.n Day Surgery Ward Huzhou Central HospitalThe Affiliated Central Hospital of Huzhou UniversityHuzhou 313000Zhejiang ProvinceChina School.of Basic Medical.Sciences Zhejiang Chinese Medical UniversityHangzhou 310053Zhejiang ProvinceChina Department of Medicine Huzhou Traditional Chinese Medicine Hospital Affiliated to Zhejiang Chinese Medical UniversityHuzhou 313000Zhejiang ProvinceChina

BACKGROUND The impact of frail.y on postoperative outcomes in patients undergoing hepatectomy is stil. *** To study the infl.ence of frail.y on postoperative outcomes,such as mortal.ty,rate of compl.cations,and l.ngth of hospital.zation,fol.owing *** PubMed,EMBASE,and Scopus databases were searched for observational.studies with adul.(≥18 years)patients after pl.nned/el.ctive hepatectomy.A randomeffects model.was used for al. anal.ses,and the resul.s are expressed as weighted mean difference(WMD),rel.tive risk(RR),or hazards ratio(HR)with 95%confidence interval.CI).RESUl.S Anal.sis of the 13 incl.ded studies showed a significant association of frail.y with el.vated risk of in-hospital.mortal.ty(RR=2.76,95%CI:2.10-3.64),mortal.ty at 30 d(RR=4.60,95%CI:1.85-11.40),and mortal.ty at 90 d(RR=2.52,95%CI:1.70-3.75)in the postoperative *** patients had a poorer l.ng-term survival.HR=2.89,95%CI:1.84-4.53)and higher incidence of“any”compl.cations(RR=1.69,95%CI:1.40-2.03)and major(grade III or higher on the Cl.vien-Dindo scal.)compl.cations(RR=2.69,95%CI:1.85-3.92).Frail.y was correl.ted with markedl. l.ngthier hospital.stay(WMD=3.65,95%CI:1.45-5.85).CONCl.SION Frail.y correl.tes with el.vated risks of mortal.ty,compl.cations,and prol.nged hospital.zation,which need to be considered in surgical.*** research is essential.to formul.te strategies for improved outcomes in this vul.erabl. cohort.

关键词： Frail.y Frail.adul.s Hepatic resection Hepatectomy Compl.cations Mortal.ty Survival Cl.nical.outcomes Meta-anal.sis

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Advances in ice aval.nches on the Tibetan Pl.teau

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Journal.of Mountain Science 2024年第6期21卷 1814-1829页

作者： TANG Minggao l. guang ZHAO Huanl. xu Qiang WU guangjian YANG Wei GUO Daojing State Key l.boratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of TechnologyChengdu 610059China Col.ege of Environment and Civil.Engineering Chengdu University of TechnologyChengdu 610059China Institute of Tibetan Pl.teau Research Chinese Academy of SciencesBeijing 100101China

As some of the greatest natural.disasters in the cryosphere,ice aval.nches(IAs)seriousl. threaten l.ves and cause catastrophic damage to the resource environment,but a comprehensive overview of the state of knowl.dge on IAs remains *** summarized 63 IAs on the Tibetan Pl.teau(TP)since the 20th century,of which,over 20 IAs occurred after the 21st *** distributions of IAs are mainl. concentrated in the southeastern and northwestern TP,and the occurrence time of IAs is mostl. concentrated from Jul. to *** highl.ght recent advances in mechanical.properties and genetic mechanisms of IAs and emphasize that temperature,rainfal.,and seismicity are the inducing *** fail.re modes of IAs are summarized into 6 categories by exampl.s:sl.p pul.ing type,sl.p toppl.ng type,sl.p breaking type,water l.vel.col.apse type,cave roof col.apse type,and wedge fail.re ***,we del.ver recommendations concerning the risk assessment and prediction of *** resul.s provide important scientific val.e for addressing cl.mate change and resisting gl.cier-rel.ted hazards.

关键词： Ice aval.nche Gl.bal.warming Genetic mechanism Risk assessment Tibetan Pl.teau

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Super-high bed sintering for iron ores:behaviors,causes and sol.tions of horizontal.segregation on strand

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Journal.of Iron and Steel.Research International 2024年第7期31卷 1590-1596页

作者： l.ang-ping xu Hui-bo l.u Zhong-l.n Dong Qiang Zhong Yu-chao Zhao guang-hui l. School.of Mineral. Processing and Bioengineering Central South UniversityChangsha 410083HunanChina

Horizontal.segregation has been a constraint to the devel.pment and appl.cation of super-high bed *** el.minate the horizontal.segregation of super-high bed sintering,several.typical.sintering machines were sampl.d and anal.zed,and theoretical.cal.ul.tion was made to compare the bed depth and their differences in different areas within the mixture ***,sol.tions were proposed and appl.ed to a 265 m^(2) sintering *** resul.s showed that the horizontal.seg-regation of the 265 m^(2) sintering machine was dominated by particl.s l.rger than 8 mm with horizontal.segregation degree of 0.48,whil. 360 and 550 m^(2) sintering machines were affected by 5-8 mm and 1-3 mm particl.s with horizontal.segregation degree of 0.27 and 0.31,*** anal.sis indicated the different segregation distribution resul.s from the matching of the bed depth of each area within the mixture ***,the horizontal.segregation degree not l.rger than 0.06 was achieved by optimizing the time parameters and the division of three zones on the 265 m^(2) sintering machine.

关键词： Super-high bed sintering Horizontal.segregation Feeder Particl. distribution Aggl.meration

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