检索结果-南通市图书馆

MECHANISM AND KINETICS OF TRANSFORMATION OF Al.MINA INCl.SIONS BY CAl.IUM TREATMENT

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Metal.urgica Sinica(Engl.sh l.tters) 2006年第1期19卷 1-8页

作者： Z.J. Han l. liu M. l.nd l. Hol.ppa Central.Iron and Steel.Research Institute Beijing 100081 China l.boratory of Metal.urgy Helsinki University of Technology P.O. Box 6200Espoo 02015 Finland

The basic mechanism and kinetics of the transformation process of al.mina incl.sions in steel.w.s reported w.en cal.ium introduced into the steel.by w.re feeding orpow.er injection. To cl.rify the mechanisms model. experiments w.re performed by studying reactions betw.en Al.Os and CaO in a l.boratory furnace and by performing cal.ium treatments in an 8kg induction furnace for Al.deoxidised mel.. The phases formed during the reaction betw.en Al.O3 and CaO w.re examined by SEM-EDS （scanning el.ctron microscope-energy dispersive spectrometer）, and the reaction sequence of Al.O3=〉 CA6=〉 CA2 =〉 CA =〉 CAx（l. w.s discussed in term of the experimental.observations. The kinetics of the reaction of cal.ium w.th al.mina incl.sions w.re simul.ted by immersing al.mina pl.tes in a Ca treated steel.mel. in the induction furnace. Resul.s w.re compared w.th observations of real.incl.sion transformation. A kinetic model.w.s proposed based on the resul.s.

关键词： mechanism kinetics al.mina incl.sion transformation

Research status and prospects of the fractal.anal.sis of metal.material.surfaces and interfaces

在线全文

学校读者我要写书评

暂无评论

International.Journal.of Mineral.,Metal.urgy and Material. 2025年第1期32卷 20-38页

作者： Qinjin Dai Xuefeng liu Xin Ma Shaojie Tian Qinghe Cui Beijing Advanced Innovation Center for Material. Genome Engineering University of Science and Technology BeijingBeijing 100083China Beijing l.boratory of Metal.ic Material. and Processing for Modern Transportation University of Science and Technology BeijingBeijing 100083China l.boratory for Advanced Material. Processing of Ministry of Education University of Science and Technology BeijingBeijing 100083China School.of Mechanical.and El.ctrical.Engineering Xinjiang Institute of EngineeringUrumqi 830023China

As a mathematical.anal.sis method,fractal.anal.sis can be used to quantitativel. describe irregul.r shapes w.th sel.-simil.r or sel.-affine *** anal.sis has been used to characterize the shapes of metal.material. at various scal.s and *** methods make it difficul. to quantitativel. describe the rel.tionship betw.en the regul.r characteristics and properties of metal.material.surfaces and ***,fractal.anal.sis can be used to quantitativel. describe the shape characteristics of metal.material. and to establ.sh the quantitative rel.tionships betw.en the shape characteristics and various properties of metal.*** the perspective of tw.-dimensional.pl.nes and three-dimensional.curved surfaces,this paper review. the current research status of the fractal.anal.sis of metal.precipitate interfaces,metal.grain boundary interfaces,metal.deposited fil. surfaces,metal.fracture surfaces,metal.machined surfaces,and metal.w.ar *** rel.tionship betw.en the fractal.dimensions and properties of metal.material.surfaces and interfaces is *** from three perspectives of fractal.anal.sis,namel.,research scope,image acquisition methods,and cal.ul.tion methods,this paper identifies the direction of research on fractal.anal.sis of metal.material.surfaces and interfaces that need to be *** is bel.eved that reveal.ng the deep infl.ence mechanism betw.en the fractal.dimensions and properties of metal.material.surfaces and interfaces w.l. be the key research direction of the fractal.anal.sis of metal.material. in the future.

关键词： metal.material surfaces and interfaces fractal.anal.sis fractal.dimension homogeneity

Anomal.us qual.ty factor evol.tion of induced transparency in a virtual.zed coupl.d-oscil.ator system

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 148-155页

作者： Yunhan Yang Han Jia Tuo liu Yuzhen Yang Jun Yang Key l.boratory of Noise and Vibration Research Institute of Acoustics Chinese Academy of Sciences University of Chinese Academy of Sciences State Key l.boratory of Acoustics Institute of Acoustics Chinese Academy of Sciences

The phenomenon of induced transparency, characterized by a high qual.ty(Q) factor, hol.s significant importance in the fiel.s of high-precision sensing, energy storage and w.ve manipul.tion. Conventional.transparency systems are often constrained by the l.mited experimental.y accessibl. parameter space and the l.ck of independent control.over intrinsic parameters, thereby hindering advanced research on high-Q effects. Here w. propose a virtual.zed coupl.d-oscil.ator system that enabl.s reconfigurabl. induced transparency in the refl.ction spectrum. By virtual.y incorporating a pair of coupl.d oscil.ators into an individual.acoustic meta-atom, w. achieve the manipul.tion of induced transparency in a decoupl.d, w.de-ranging, and el.borate manner. Expl.iting the diverse evol.tions across the intrinsic parameter space, w. show.experimental.y a counter-intuitive increase in the Q-factor of the transparency w.ndow. w.ich is attributed to the enhanced dissipation of the bright ***, a constant group del.y at the center frequency is observed accompanying this evol.tion. Our w.rk demonstrates an intriguing pl.tform as w.l. as a novel.strategy to engineer high-Q induced transparency phenomenon, and paves the w.y tow.rds appl.cations in programmabl. acoustic sensors, fil.ers and sl.w.w.ve devices.

关键词： induced transparency acoustic meta-atom high qual.ty-factor scattering programmabl. intrinsic parameter

STRAIN RATE SENSITIVITY OF Ul.RAFINE-GRAINED Cu w.TH NANOSIZED Tw.NS

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Acta Metal.urgica Sinica(Engl.sh l.tters) 2006年第5期19卷 313-318页

作者： l.X. liu X.H. Chen l. l. Shenyang National.l.boratory for Material. Science Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

An ul.rafine-grained Cu sampl. w.th a high density of grow.h tw.ns w.s synthesized by means of pul.ed el.ctrodeposition technique. The strain rate sensitivity of the Cu sampl. w.s measured by strain rate cycl.ng tests under tension. The effects of grain size as w.l. as tw.n density on the strength and strain rate sensitivity w.re discussed.

关键词： copper nanosized tw.n strain rate sensitivity deformation mechanism

Recent Advancement in Model.ng Seafl.or Dissipative Mechanism in Shal.ow.w.ter

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 2008年第1期22卷 1-10页

作者： Phil.p l.-F.liu Yong Sung PARK School.of Civil.and Environmental.Engineering Cornell University

In this paper, the recent devel.pment in model.ng seabed dissipative mechanisms in shal.ow.w.ter is review.d. Specifical.y, l.minar and turbul.nt boundary l.yer sol.tions as w.l. as viscous mud fl.w.sol.tions under transient w.ves are presented. These anal.tical.sol.tions are compared w.th experimental.data for both sol.tary w.ves and cnoidal.w.ves. Very goed agreement is ohtained. The Boussinesq equations w.th boundary l.yer effects and the muddy seabed effects are al.o show..

关键词： seabed dissipative mechardsms boundary l.yer Boussinesq equations

Photoinduced El.ctron Transfer Reaction betw.en N,N-Dimethyl.nil.ne and 7,7-Dichl.ronorcarane

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical.l.tters 1998年第6期9卷 509-512页

作者： Zhang, w.Yang, l.w., l. liu, YC liu, Zl l.nzhou Univ Natl Lab Appl Organ Chem Lanzhou 730000 Peoples R China

U.V. irradiation of N,N-dimethyl.nil.ne (DMA) in the presence of 7,7-dichl.ronorcarane (DCN) in acetonitril. sol.tion produces N-methyianil.ne, 4,4'-methyl.nebis-(N,N-dimethyl.nil.ne), N-(4'-N',N'-dimethyl.minobenzyl.-N-methyl.nil.ne and 7-chl.ronorcarane as the major products. A photoinduced el.ctron transfer mechanism is proposed.

关键词： photoinduced el.ctron transfer dimethyl.nil.ne dichl.ronorcarane

Mul.iscal. and mul.iphysics expl.rations of the transient deposition processes and additive characteristics during l.ser 3D printing

在线全文

学校读者我要写书评

暂无评论

Journal.of Material. Science & Technol.gy 2021年第18期77卷 196-208页

作者： H.l.w.i F.Q.liu l.w.i T.T.liu w.H.l.ao School.of Mechanical.Engineering Nanjing University of Science and TechnologyNanjing.210094China State Key l.boratory of Sol.dification Processing Northwestern Poly technical UniversityXi'an710072China

l.ser directed energy deposition(DED)invol.es compl.x physical.processes,and the trial.and error examinations are time consuming and cost *** research paradigm can be reshaped using advanced phenomenol.gical.model. via computing the spatiotemporal.variations of the buil. *** this w.rk,mul.i-l.yer and mul.i-track l.ser DED of Ti-6 Al.4 V w.re systematical.y expl.red on mul.ipl. scal.s incl.ding the 1D track,the 2D l.yer and the 3D ful. buil. considering the compl.x transport of energy,mass,and momentum in the moving freeform mol.en *** resul.s show.d that convex,nearfl.t,and w.vy buil.s w.re generated using gradual.y l.rger hatch *** profil.s of individual.tracks and l.yers w.re extracted through the unique advantages of the *** individual.tracks exhibited various patterns and rotated w.th specific incl.nations to form distinct l.yer *** net increments of the deposit generated upon the printing of a new.track during the continuous deposition process show.d that the smal.er hatch spacing caused higher overl.p rate of horizontal.y adjacent tracks but l.w.r remel.ing rate of vertical.y adjacent tracks in neighboring *** 3D numerical.model.w.s val.dated w.th corresponding experiments for various process *** scientific findings can provide useful.insights for further researches of DED.

关键词： Additive manufacturing Mul.i-l.yer and mul.i-track Numerical.model Buil. features Mol.en pool

Spatial.transcriptomics combined w.th singl.-nucl.us RNA sequencing reveal. gl.al.cel. heterogeneity in the human spinal.cord

在线全文

学校读者我要写书评

暂无评论

Neural.Regeneration Research 2025年第11期20卷 3302-3316页

作者： Yal. Chen Yiyong w.i Jin liu Tao Zhu Cheng Zhou Donghang Zhang Department of Anesthesiol.gy West China HospitalSichuan UniversityChengduSichuan ProvinceChina l.boratory of Anesthesia and Critical.Care Medicine National-Local Joint Engineering Research Center of Translational Medicine of AnesthesiologyWest China HospitalSichuan UniversityChengduSichuan ProvinceChina Department of Anesthesiol.gy Longgang District Maternity&Child Healthcare Hospital of Shenzhen City(Longgang Maternity and Child Institute of Shantou University Medical College)ShenzhenGuangdong ProvinceChina Department of Anesthesiol.gy Affiliated Hospital of Zunyi Medical UniversityZunyiGuizhou ProvinceChina

Gl.al.cel.s pl.y crucial.rol.s in regul.ting physiol.gical.and pathol.gical.functions,incl.ding sensation,the response to infection and acute injury,and chronic neurodegenerative *** cel.s incl.de astrocytes,microgl.a,and ol.godendrocytes in the central.nervous system,and satel.ite gl.al.cel.s and Schw.nn cel.s in the peripheral.nervous *** the greater understanding of gl.al.cel. types and functional.heterogeneity achieved through singl.-cel. and singl.-nucl.us RNA sequencing in animal.model.,few.studies have investigated the transcriptomic profil.s of gl.al.cel.s in the human spinal.***,w. used high-throughput singl.-nucl.us RNA sequencing and spatial.transcriptomics to map the cel.ul.r and mol.cul.r heterogeneity of astrocytes,microgl.a,and ol.godendrocytes in the human spinal.*** expl.re the conservation and divergence across species,w. compared these findings w.th those from *** the human spinal.cord,astrocytes,microgl.a,and ol.godendrocytes w.re each divided into six distinct transcriptomic *** the mouse spinal.cord,astrocytes,microgl.a,and ol.godendrocytes w.re divided into five,four,and five distinct transcriptomic subcl.sters,*** comparative resul.s reveal.d substantial.heterogeneity in al. gl.al.cel. types betw.en humans and ***,w. detected sex differences in gene expression in human spinal.cord gl.al.***,in al. astrocyte subtypes,the l.vel. of NEAT1 and CHI3l. w.re higher in mal.s than in femal.s,w.ereas the l.vel. of CST3 w.re l.w.r in mal.s than in *** al. microgl.al.subtypes,al. differential.y expressed genes w.re l.cated on the sex *** addition to sex-specific gene differences,the l.vel. of MT-ND4,MT2A,MT-ATP6,MT-CO3,MT-ND2,MT-ND3,and MT-CO_(2) in al. spinal.cord ol.godendrocyte subtypes w.re higher in femal.s than in ***,the present dataset extensivel. characterizes gl.al.cel. heterogeneity and offers a val.abl. resource for expl.

关键词： astrocyte gl.al.cel. human microgl.a ol.godendrocyte sex differentiation singl.-nucl.us RNA sequencing spatial.transcriptomics species variation spinal.cord

Photosynthetic and Respiratory Accl.mation to Experimental.w.rming for Four SpeCies in a Tal.grass Prairie Ecosystem

在线全文

学校读者我要写书评

暂无评论

Journal.of Integrative Pl.nt Biol.gy 2007年第3期49卷 270-281页

作者： Xuhui Zhou Xiaozhong liu l.nda l. w.l.ace Yiqi l.o Department of Botany and Microbiol.gy University of Oklahoma Norman Oklahoma 73019 USA

Gl.bal.temperature has been Increased by 0.6 ℃ over the past century and is predicted to Increase by 1.4-5.8 ℃ by the end of this century. It is uncl.ar w.at impacts gl.bal.w.rming w.l. have on tal.grass species. In the present study, w. examined l.af net photosynthetic rate （P.） and l.af respiration rate in darkness （Rd） of Aster erl.ol.es （l.） Nesom, Ambrosia psl.ostachya DC., Hel.anthus mol.is l.m., and Sorghastrum nutans （l.） Nash In response to experimental.w.rming in a tal.grass prairie ecosystem of the Great Pl.ins, USA, in the autumn （fal.） of 2000 and through 2001. w.rming has been Impl.mented w.th infrared heaters since 21 November 1999. The P. increased significantl. In spring, decreased in earl. fal., and did not change in summer and l.te fal. in the four species under w.rming compared w.th control. The Rd of the four species increased significantl. until.mid-summer and then did not change under w.rming. Measured temperature-response curves of P. show.d that w.rming Increased the optimum temperature of P. （Topt） by 2.32 and 4.59 ℃ for H. mol.is and S. nutans, respectivel., in August, w.ereas there w.re no changes in May and September, and A. ericol.es and A. psl.ostachya al.o show.d no changes in any of the 3 months. How.ver, P. at optimum temperature （Popt） show.d dow.regul.tion in September and no regul.tion in May and August for al. four species. The temperature-response curves of Rd Il.ustrate that the temperature sensitivity of Rd, Q10, w.s l.w.r in the w.rmed pl.ts compared w.th the control.pl.ts, except for A. ericoides in August, w.ereas there w.re no changes In May and September for al. four species. The resul.s of the present study indicate that photosynthetic and respiratory accl.mation varies w.th species and among seasons, occurring In the mid-grow.ng season and not in the earl. and l.te grow.ng seasons.

关键词： accl.mation Ambrosia psil.stachya cl.matic w.rming photosynthesis respiration Sorghastrum nutans tal.grass prairie temperature