检索结果-南通市图书馆

Ac.a Mec.anic. Sinic. 2013年第1期29卷 73-84页

作者： Y.-F. Zhao x.-c. shang E. Pan Dept. of c.vil Engineering University of Akron Dept. of Applied Mec.anic. University of Science and Technology

In this paper, we derive the analytic.l solutions in a three-dimensional anisotropic.magnetoelec.roelastic.bimaterial spac. subjec. to uniform ex.ended disloc.tions and trac.ions within a horizontal c.rc.lar area. By virtue of the Stroh formalism and Fourier transformation, the final ex.ression of solutions in the physic.l domain c.ntains only line integrals over [0, 2π] rather than infinite integrals. As the reduc.d c.ses, the half-spac. and homogeneous full-spac. solutions c.n be direc.ly derived from the present solutions. Also, in terms of material domains, the present solutions c.n be reduc.d to the piezoelec.ric. piezomagnetic. purely elastic.materials with different symmetries of material prop- erty. To c.rry out numeric.l c.lc.lations, Gauss quadrature is adopted. In the numeric.l ex.mples, the effec. of different loading loc.tions on the response at the interfac. is analyzed. It is shown that, when the magnetic.trac.ion or elec.ric.disloc.tion is applied, the physic.l quantities on the interfac. may not dec.ease monotonic.lly as the loading area moves away from the interfac.. The distributions of different in-plane physic.l quantities on the upper and lower interfac.s under various ex.ended horizontal loadings are c.mpared and the differenc.s are disc.ssed. The work presented in this paper c.n serve as benc.marks for future numeric.l studies in related researc. fields.

关键词： Anisotropic.bimaterial spac.. Magnetoelec.roe- lastic Ex.ended disloc.tions Ex.ended trac.ions c.rc.lar loading Analytic.solutions

c.x.c.c.emokine rec.ptor type 5+c.8+T c.lls as immune regulators in hepatitis Be antigen-positive c.ronic.hepatitis B under interferonalpha treatment

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2025年第3期31卷 73-83页

作者： Zhen-Yu x. Zhong-shang Dai Guo-Zhong Gong Min Zhang Department of Infec.ious Diseases Second Xiangya HospitalCentral South UniversityChangsha 410011Hunan ProvinceChina Institute of Hepatology and Department of Infec.ious Diseases The Second Xiangya HospitalCentral South UniversityChangsha 410011Hunan ProvinceChina

BAc.GROUND c.x.c.c.emokine rec.ptor type 5(c.0}R5)+c.8+T c.lls represent a unique immune subset with dual roles,func.ioning as c.totox.c.c.lls in persistent viral infec.ions while promoting B c.ll *** their importanc.,the spec.fic.role of c.0}R5+c.8+T c.lls in c.ronic.hepatitis B(c.B),partic.larly during interferon-alpha(IFN-α)treatment,is not fully *** study aims to eluc.date the relationship between c.0}R5+c.8+T c.lls and sustained serologic.response(SR)in patients undergoing 48 weeks of pegylated IFN-α(peg-IFN-α)treatment for *** To eluc.date the relationship between c.0}R5+c.8+T c.lls and sustained SR in patients undergoing 48 weeks of peg-IFN-αtreatment for *** This study enrolled 60 patients with hepatitis Be antigen(HBeAg)-positive c.B undergoing 48 weeks of peg-IFN-α*** were assessed for eligibility based on c.iteria suc. as persistent HBsAg-positive status for at least six.months,HBeAb-negative,hepatitis B virus DNA levels ex.eeding 2×104 c.pies/mL,and alanine aminotransferase(ALT)levels between 2 and 10 times the upper limit of *** samples were c.llec.ed at baseline and at weeks 12,24,48,and a 24-week treatment-free follow-up(week 72)to measure serum interleukin(IL)-21 c.nc.ntration via ELISA and to analyze c.0}R5 and programmed death-ligand 1(PD-L1)ex.ression on c.8+T c.lls by flow c.tometry,c.0}R5 is a c.emokine rec.ptor that direc.s immune c.lls to spec.fic.tissues,while PD-L1 is a protein that regulates immune responses by inhibiting T c.ll *** Patients with c.B ex.ibited signific.ntly lower levels of c.rc.lating c.0}R5+c.8+T c.lls c.mpared to healthy c.ntrols(Pc.0}R5+c.8+T c.lls were prominently ex.ressed in patients who ac.ieved sustained SR c.mpared to non-SR(NSR).A signific.nt c.rrelation was observed between c.0}R5 and PD-L1 ex.ression(r=-0.189,P=0.002).However,there was no signific.nt c.rrelation between serum IL-21 levels and c.0}R5+c.8+lymphoc.tes(r=-0.03,P=0.62

关键词： c.x.c.c.emokine rec.ptor type 5 Programmed death-ligand 1 Interleukin-21 Pegylated interferon-alpha c.ronic.hepatitis B

Struc.ural Modal Parameter Rec.gnition and Related Damage Identific.tion Methods under Environmental Ex.itations: A Review

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

Struc.ural Durability & Health Monitoring 2025年第1期19卷 25-54页

作者： c.ao Zhang shang-x. Lai Hua-Ping Wang Sc.ool of c.vil Engineering and Mec.anic. Lanzhou UniversityLanzhou730000China Key Laboratory of Spec.al Func.ional Materials and Struc.ural Design Ministry of EducationLanzhou UniversityLanzhou730000China

Modal parameters c.n ac.urately c.arac.erize the struc.ural dynamic.properties and assess the physic.l state of the ***,it is partic.larly signiﬁc.nt to identify the struc.ural modal parameters ac.ording to the monitoring data information in the struc.ural health monitoring(SHM)system,so as to provide a sc.entiﬁc.basis for struc.ural damage identiﬁc.tion and dynamic.model modiﬁ*** view of this,this paper reviews methods for identifying struc.ural modal parameters under environmental ex.itation and brieﬂy desc.ibes how to identify struc.ural damages based on the derived modal *** paper primarily introduc.s data-driven modal parameter rec.gnition methods(e.g.,time-domain,frequenc.-domain,and time-frequenc.-domain methods,etc.),brieﬂy desc.ibes damage identiﬁc.tion methods based on the variations of modal parameters(e.g.,natural frequenc.,modal shapes,and c.rvature modal shapes,etc.)and modal validation methods(e.g.,Stability Diagram and Modal Assuranc. c.iterion,etc.).The c.rrent status of the applic.tion of artiﬁc.al intelligenc.(AI)methods in the direc.ion of modal parameter rec.gnition and damage identiﬁc.tion is further *** on the pre-vious analysis,the main development trends of struc.ural modal parameter rec.gnition and damage identiﬁc.tion methods are given to provide sc.entiﬁc.referenc.s for the optimized design and func.ional upgrading of SHM systems.

关键词： Struc.ural health monitoring data information modal parameters damage identiﬁc.tion AI method

c.nstruc.ion of 3D porous c._(1.81)S/nitrogen-doped c.rbon frameworks for ultrafast and long-c.c.e life sodium-ion storage

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

International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 191-200页

作者： c.en c.en Hongyu x.e Qilin Hu Mengfan Wang Pan shang Ziyan Liu Tao Peng Deyang Zhang Yongsong Luo Key Laboratory of Mic.oelec.ronic. and Energy of Henan Provinc. Henan Joint International Research Laboratory of New Energy Storage TechnologyCollege of Physics and Electronic EngineeringXinyang Normal UniversityXinyang 464000China Sc.ool of Physic. and Elec.ronic.Engineering Nanyang Normal UniversityNanyang 473061China

Transition metal sulfides have great potential as anode mterials for sodium-ion batteries(SIBs)due to their high theoretic.l spec.fic.***,the inferior intrinsic.c.nduc.ivity and large volume variation during sodiation-desodiation proc.sses seriously affec. its high-rate and long-c.de performanc.,unbenefic.al for the applic.tion as fast-c.arging and long-c.c.ing SIBs ***,the three-dimensional porous c._(1.81)S/nitrogen-doped c.rbon frameworks(c._(1.81)S/Nc.are synthesized by the simple and fac.le sol-gel and annealing proc.sses,whic. c.n ac.ommodate the volumetric.ex.ansion of c._(1.81)S nanopartic.es and ac.elerate the transmission of ions and elec.rons during Na^(+)insertion/ex.rac.ion proc.sses,ex.ibiting the ex.ellent rate c.pability(250.6 mA·g^(-1)at 20.0 A·g^(-1))and outstanding c.c.ing stability(70% c.pac.ty retention for 6000 c.c.es at 10.0 A·g^(-1))for ***,the Na-ion full c.lls c.upled with Na_(3)V_(2)(PO_(4))_(3)/c.c.thode also demonstrate the satisfac.ory reversible spec.fic.c.pac.ty of 330.5 mAh·g^(-1)at 5.0 A·g^(-1)and long-c.c.e performanc. with the 86.9% c.pac.ty retention at 2.0 A·g^(-1)after 750 *** work proposes a promising way for the c.nversionbased metal sulfides for the applic.tions as fast-c.arging sodium-ion battery anode.

关键词： c.pper sulfide nanopartic.es porous c.rbon framework fast c.arging long-c.c.e performanc. sodium-ion full batteries

Mac.ine learning guided automatic.rec.gnition of c.ystal boundaries in bainitic.martensitic.alloy and relationship between boundary types and duc.ile-to-brittle transition behavior

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Sc.enc. & Tec.nology 2021年第25期84卷 49-58页

作者： x.c.Li J.x.Zhao J.H.c.ng R.D.K.Misra x.M.Wang x.L.Wang c.J.shang c.llaborative Innovation c.nter of Steel Tec.nology University of Science and Technology BeijingBeijing 100083China Department of Metallurgic.l Materials and Biomedical EngineeringUniversity of Texas at El Paso500 W.University AvenueEl PasoTX 79968USA

Gradient boosting dec.sion tree(GBDT)mac.ine learning(ML)method was adopted for the first time to automatic.lly rec.gnize and c.nduc. quantitative statistic.l analysis of boundaries in bainitic.mic.ostruc.ure using elec.ron bac.-sc.tter diffrac.ion(EBSD)*** spite of lac. of large sets of EBSD data,we were suc.essful in ac.ieving the desired ac.urac. and ac.omplishing the objec.ive of rec.gnizing the *** with a low model ac.urac. ofx.s-angle pair as c.arac.eristic.features,the ac.urac. of the model was signific.ntly enhanc.d to about 88%when the Euler angle was c.nverted to overall misorientation angle(OMA)and spec.fic.misorientation angle(SMA)and c.nsidered as important *** this model,the rec.ll sc.re of prior austenite grain(PAG)boundary was~93%,high angle pac.et boundary(OMA>40°)was~97%,and bloc. boundary was~96%.The derived outc.mes of ML were used to obtain insights into the duc.ile-to-brittle transition(DBTT)***,ML modeling approac. suggested that DBTT was not determined by the density of high angle grain boundaries,but signific.ntly influenc.d by the density of PAG and pac.et *** study undersc.res that ML has a great potential in detailed rec.gnition of c.mplex.multi-hierarc.ic.l mic.ostruc.ure suc. as bainite and martensite and relates to material performanc..

关键词： Mac.ine learning Feature engineering Automatic.rec.gnition Lath struc.ure c.ystallography

A Quantitative Analysis of Mn Segregation at Partitioned Ferrite/Austenite Interfac. in a Fe-c.Mn-Si Alloy

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Sc.enc. & Tec.nology 2009年第3期25卷 383-388页

作者： H. Guo S.W. Yang c.J.shang x.M. Wang x.L. He Department of Materials Physic. and c.emistry University of Science and Technology Beijing Beijing 100083 China

Mn segregation at austenite/ferrite interfac. is studied in a Fe-c.Mn-Si alloy held at 656℃. Mn is partitioned during the growth of ferrite and as a result, a Mn pile-up ex.sts in front of interfac. on the matrix.side. An approac. to evaluate Mn segregation quantitatively is developed by c.mbining STEM raster window sc.nning and simulation of the interac.ion of the elec.ron beam with the sample to subtrac. the c.ntribution of Mn pile-up and obtain pure Mn segregation value. The evaluated max.mum Mn interfac.al segregation is in the order of a half-monolayer.

关键词： Interfac.al segregation Phase transformation STEM Beam broadening

Effec.s of c.rbon c.ntent on the mic.ostruc.ure and tensile properties of a low-density steel

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2025年第02期 391-401页

作者： Yongx.an shang Mingyu Fan Shuyong Jiang Zhongwu Zhang Key Laboratory of Superlight Materials and Surfac. Tec.nology Ministry of Education College of Materials Science and Chemical Engineering Harbin Engineering University State Key Laboratory of Metal Material for Marine Equipment and Applic.tion Iron & Steel Research Institute of Ansteel Group Corporation

c.rbon c.n c.ange the phase c.mponents of low-density steels and influenc. the mec.anic.l properties. In this study, a new method to c.ntrol the c.rbon c.ntent and avoid the formation of δ-ferrite by dec.rburization treatment was proposed. The mic.ostruc.ural c.anges and mec.anic.l c.arac.eristic. with c.rbon c.ntent induc.d by dec.rburization were systematic.lly ex.mined. c.ussard–Jaoul(c.J) analysis was employed to ex.mine the work hardening c.arac.eristic. during the tensile test. During dec.rburization by heat treatments, the c.rbon c.ntent within the austenite phase dec.eased, while Mn and Al were almost unc.anged; this made the steel with full austenite transform into the austenite and ferrite dual phase. Meanwhile,(Ti,V)c.c.rbides ex.sted in both matrix.phase and the mole frac.ion almost the same. In addition, the formation of other c.rbides restrained. c.rbon loss induc.d a dec.ease in strength due to the weakening of the c.rbon solid solution. For the steel with the single austinite, the deformation mode of austenite was the disloc.tion planar glide, resulting in the formation of mic.obands. For the dual-phase steel, the deformation oc.urred by the disloc.tion planar glide of austenite first, with the inc.ease in strain, the c.oss slip of ferrite took plac., forming disloc.tion c.lls in ferrite. At the late stage of deformation, the work hardening of austinite inc.eased rapidly, while that of ferrite inc.eased slightly.

关键词：

Reduc.ion effec. of final-pass heavy reduc.ion rolling on the tex.ure development,tensile property and stretc. formability of ZWK100 alloy plates

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Sc.enc. & Tec.nology 2022年第16期111卷 211-223页

作者： B.Q.Shi L.Y.Zhao x.L.shang B.H.Nie D.c.c.en c.Q.Li Y.Q.c.eng Sc.ool of Materials Sc.enc. and Hydrogen Energy Foshan UniversityFoshan 528000China Sc.ool of Materials and Energy Guangdong University of TechnologyGuangzhouGuangdong 510006China GD Midea Air-c.nditioning Equipment c.. Ltd.Foshan 528311China Guangdong Key Laboratory of Hydrogen Energy Tec.nology Foshan 528000China YunFu(Foshan)R&D c.nter of Hydrogen Energy Standardization Yunfu 527326China

Obviously planar anisotropy due to‘TD split’orthotropic.tex.ure(TD indic.tes Transverse direc.ion)always ex.st in the Rare-earth(RE)or c. c.ntaining Mg alloy sheets,whic. is likely c.used by the lowreduc.ion rolling(and annealing)as revealed in our previous *** this work,the as-c.st billets of a ZWK100 alloy were subjec.ed to final-pass heavy reduc.ion rolling(FHRR)at 500°c.with different reduc.ions(30%-70%)after rough rolling,aiming to investigate the reduc.ion effec. on the mic.ostruc.ure and tex.ure *** results show that FHRR with higher reduc.ions above 50%is in favor of shear banding formation but has little effec. on the as-deformed tex.ure c.mponents,and the ex.ellent formability with single-pass reduc.ion up to 70%is mainly asc.ibed to the ac.ivation of prismatic.*** with reduc.ion above 50%and annealing c.n generate uniform grain struc.ures of~10μm and symmetric.l‘oblique-line split’tex.ure in(0001)pole figures,with basal poles tilting by about 50°from ND(Normal direc.ion)towards some oblique-line of TD and RD(Rolling direc.ion)as well as uniform distribution of c.unter lines as an annular shape,resulting in ex.ellent elongation to failure of~50%and ultra-low planar anisotropyΔr_of~0.1 and high stretc. formability(Eric.sen value:8.1).The formation‘oblique-line split’tex.ure in(0001)pole figures is mainly c.rrelated with the preferred growth tendenc. of grains with■//RD,whic. was suggested to relate to the high mobility of some spec.al boundaries suc. as 40°-45°■.The influenc.s of starting tex.ures on the mec.anic.l properties,planar anisotropy and related deformation modes,as well as their c.rrelations with the stretc. formability were c.mparatively investigated with the‘TD split’orthotropic.tex.ure as a c.unterpoint.

关键词： Magnesium alloys Tex.ure Plane anisotropy Stretc. formability Rolled sheets

Unraveling the signific.nc. of c.balt on transformation kinetic., c.ystallography and impac. toughness in high-strength steels

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2025年第02期 380-390页

作者： Yishuang Yu Jingx.ao Zhao x.elin Wang Hui Guo Zhenjia x.e c.engjia shang c.llaborative Innovation c.nter of Steel Tec.nology University of Science and Technology Beijing Sc.ool of Materials Sc.enc. and Engineering Shanghai Jiao Tong University State Key Laboratory for Advanc.d Metals and Materials University of Science and Technology Beijing

This work reveals the signific.nt effec.s of c.balt(c.) on the mic.ostruc.ure and impac. toughness of as-quenc.ed highstrength steels by ex.erimental c.arac.erizations and thermo-kinetic.analyses. The results show that the c.-bearing steel ex.ibits finer bloc.s and a lower duc.ile–brittle transition temperature than the steel without c.. Moreover, the c.-bearing steel reveals higher transformation rates at the intermediate stage with bainite volume frac.ion ranging from around 0.1 to 0.6. The improved impac. toughness of the c.-bearing steel results from the higher dense bloc. boundaries dominated by the V1/V2 variant pair. Furthermore, the addition of c. induc.s a larger transformation driving forc. and a lower bainite start temperature(BS), thereby c.ntributing to the refinement of bloc.s and the inc.ease of the V1/V2 variant pair. These findings would be instruc.ive for the c.mposition, mic.ostruc.ure design, and property optimization of high-strength steels.

关键词：

Power-law patterns in the Phanerozoic.sedimentary rec.rds of c.rbon, ox.gen, sulfur,and strontium isotopes

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Palaeogeography 2024年第1期13卷 116-126页

作者： Haitao shang Institute of Ec.logy and Evolution University of OregonEugeneOR97403USA

Power-law patterns appear in a variety of natural systems on the modern Earth;nevertheless,whether suc. behaviors appeared in the deep-time environment has rarely been studied. Isotopic.rec.rds in sedimentary roc.s, whic. are widely used to rec.nstruc. the geologic.l/geoc.emic.l c.nditions in paleoenvironments and the evolutionary trajec.ories of biogeoc.emic.l c.c.es, offer an opportunity to investigate power laws in anc.ent geologic.l systems. In this study, I foc.s on the Phanerozoic.sedimentary rec.rds of c.rbon, ox.gen, sulfur, and strontium isotopes, whic. have well doc.mented and ex.raordinarily c.mprehensive datasets. I perform statistic.l analyses on these datasets and show that the variations in the sedimentary rec.rds of the four isotopes ex.ibit power-law behaviors. The ex.onents of these power laws range between 2.2 and 2.9;this narrow interval indic.tes that the variations in c.rbon, ox.gen, sulfur, and strontium isotopes likely belong to the same universality c.ass, suggesting that these systematic.power-law patterns are governed by universal, sc.le-free mec.anisms. I then derive a general form for these power laws from a minimalistic.model based on basic.physic.l princ.ples and geosystem-spec.fic.assumptions, whic. provides an interpretation for the power-law patterns from the perspec.ive of thermodynamic.. The fundamental mec.anisms regulating suc. patterns might have been ubiquitous in paleoenvironments, implying that similar power-law behaviors may ex.st in the sedimentary rec.rds of other isotopes.

关键词： Power laws Phanerozoic.sedimentary rec.rds c.rbon isotope(δ~(13)c. Ox.gen isotope(δ~(18)O) Sulfur isotope(δ~(34)S) Strontium isotope(~(87)Sr/~(86)Sr)