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Alloy design by dislocation engineering

Journal of Materials Science & Technology 2018年第3期34卷 417-420页

作者： M.X.Huang b.b.He Department of Mechanical Engineering The University of Hong Kong

Ultra-high strength alloys with good ductility are ideal materials for lightweight structural application in various industries. However, improving the strength of alloys frequently results in a reduction in ductility, which is known as the strength-ductility trade-off in metallic materials. Current alloy design strategies for improving the ductility of ultra-high strength alloys mainly focus on the selection of alloy composition （atomic length scale） or manipulating ultra-fine and nano-grained microstructure （grain length scale）. The intermediate length scale between atomic and grain scales is the dislocation length scale. A new alloy design concept based on such dislocation length scale, namely dislocation engineering, is illustrated in the present work. This dislocation engineering concept has been successfully substantiated by the design and fabrication of a deformed and partitioned （D＆P） steel with a yield strength of 2,2 GPa and an uniform elongation of 16%. In this D＆P steel, high dislocation density can not only increase strength but also improve ductility. High dislocation density is mainly responsible for the improved yield strength through dislocation forest hardening, whilst the improved ductility is achieved by the glide of intensive mobile dislocations and well-controlled transformation-induced plasticity （TRIP） effect, both of which are governed by the high dislocation density resulting from warm rolling and martensitic transformation during cold rolling. In addition, the present work proposes for the first time to apply such dislocation engineering concept to the quenching and partitioning （Q＆P） steel by incorporating a warm rolling process prior to the quenching step, with an aim to improve simultaneously the strength and ductility of the Q＆P steel. It is believed that dislocation engineering provides a new promising alloy design strategy for producing novel strong and ductile alloys.

关键词： Alioy design Dislocation engineering D&P steel Q&P steel TRIP Warm rolling

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Seroprevalence of hepatitis b,hepatitis C,human immunodeficiency virus,Treponema pallidum,and co-infections among blood donors in Kyrgyzstan:a retrospective analysis(2013-2015)

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Infectious Diseases of Poverty 2017年第1期6卷 401-409页

作者： bakyt b.Karabaev Nurgul J.beisheeva Aiganysh b.Satybaldieva Aikul D.Ismailova Frank Pessler Manas K.Akmatov Republican blood Centre BishkekKyrgyzstanChingiz Aitmatov Ave 60720044 BishkekKyrgyzstan Republican AIDS Centre BishkekKyrgyzstanLogvinenko Str.8720040 BishkekKyrgyzstan TWINCORE Centre for Experimental and Clinical Infection ResearchFeodor-Lynen-Str.730625 HannoverGermany Helmholtz Centre for Infection Research Inhoffenstr.738124 BraunschweigGermany Centre for Individualized Infection Medicine c/o CRC HannoverFeodor-Lynen-Str.1530625 HannoverGermany

background:Post-Soviet Kyrgyzstan has experienced a major surge in blood-borne infections,but data from adequately powered,up-to-date studies are *** thus examined a)the seroprevalences of hepatitis b virus surface antigen(HbsAg),HIV-1 p24 antigen and antibodies against hepatitis C virus(anti-HCV),human immunodeficiency viruses(anti-HIV-1/2,HIV-1 group O),and Treponema pallidum among blood donors in Kyrgyzstan and assess their distribution according to sex,age,and provinces of residence;b)trends in the respective seroprevalences;and c)co-infection rates among the pathogens ***:Serological screening was performed on 37165 blood donors at the Republican blood Centre in bishkek,Kyrgyzstan,between January 2013 and December *** applied poststratification weights to control for sampling bias and used logistic regression analyses to examine the association of seropositivity and co-infections with sex,age,provinces of residence,and year of blood ***:Twenty nine thousand and one hundred forty-five(78%)donors were males and 8020(22%)were *** median age was 27 years(range:18-64).The prevalences of HbsAg,anti-HCV,HIV(p24 Ag and anti-HIV),and *** were 3.6%(95%CI:3.4-3.8%),3.1%(3.0-3.3%),0.78%(0.69-0.87%),and 3.3%(3.1-3.5%),*** were more likely to be seropositive for HbsAg than females(OR:1.63;95%CI:1.40-1.90),but less likely to be seropositive for anti-HCV(0.85;0.74-0.98)and HIV(0.65;0.49-0.85).Prevalences were lower in the capital than in the other *** was a decreasing trend in the seroprevalences of HbsAg,anti-HCV,and *** from 2012 to 2015(P-value for trend,P=0.01,Pbserved between *** and HbsAg(6.0%),followed by anti-HCV and ***(5.2%),and HIV and anti-HCV(4.9%).Conclusions

关键词： Hepatitis b Hepatitis C Human immunodeficiency virus T.pallidum Co-infections Prevalence blood donors Kyrgyzstan

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AZ31b镁合金薄板超塑性气胀成形

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稀有金属材料与工程 2009年第7期38卷 1259-1263页

作者：张青来肖富贵郭海铃 A b bondarev b I bondarev 江苏大学江苏镇江212013 Industrial Center MATEKS Ltd Moscow 121596 Russia

利用热拉伸试验、气胀成形、金相显微镜和扫描电镜,研究AZ31b镁合金薄板热拉伸性能、气胀成形性能及其组织结构。结果表明:在变形温度为425℃,应变速率为1.0×10-3～6.6×10-5s-1时,其流动应力4～12MPa,延伸率则为200%～327%,挤压+热轧... 详细信息

利用热拉伸试验、气胀成形、金相显微镜和扫描电镜,研究AZ31b镁合金薄板热拉伸性能、气胀成形性能及其组织结构。结果表明:在变形温度为425℃,应变速率为1.0×10-3～6.6×10-5s-1时,其流动应力4～12MPa,延伸率则为200%～327%,挤压+热轧/冷轧的镁合金薄板表现出良好的超塑性;在变形温度为425℃,应变速率为1.0×10-3s-1条件下AZ31b镁合金板材的超塑气胀成形性能较好,胀形件的高度可达24mm以上,其高径比大于0.80。

关键词：镁合金热拉伸气胀成形微观组织

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Late and very late onset group b Streptococcus sepsis:one and the same?

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World Journal of Pediatrics 2014年第1期10卷 24-28页

作者： Joseph b Cantey Courtney baldridge Rachel Jamison Leticia A Shanley Department of Pediatrics University of Texas Southwestern Medical CenterDallasTXUSA

background:This study aimed to describe the clinical characteristics of group b Streptococcus(GbS)sepsis in infants aged 4–90 days[late onset(LO)]compared to infants>90 days of age[very late onset(VLO)].Methods:Microbiology records at Children’s Medical Center Dallas were ***,clinical,and outcome data were collected for infants with GbS recovered from blood or cerebrospinal fluid culture from January 1,2006 to July 1,***:Totally 48 infants were identified(42 LO,6 VLO).Infants with VLO sepsis had lower median gestational age(28.5 vs.39 weeks gestation,PbS was ***:Infants with VLO sepsis had lower gestational ages and longer nursery stays than infants with LO *** age at presentation,there were no significant differences in clinical presentations,hospital course,frequency of neurodevelopmental sequelae,and mortality in infants presenting with LO *** GbS *** with VLO sepsis were more likely to receive empiric broad spectrum antimicrobials and more likely to continue receiving broad therapy even following GbS identification.

关键词： group b Streptococcus infant meningitis sepsis

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Proton-halo breakup dynamics for the breakup threshold in theε0→0 limit

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Chinese Physics C 2021年第5期45卷 166-172页

作者： b.Mukeru Department of Physics University of South AfricaP.O.Box 392Pretoria 0003South Africa

Proton-halo breakup behavior in theε0→0 limit(whereε0 is the ground-state binding energy)is stud-ied around the Coulomb barrier in the^(8)b+^(58)Ni reaction for the first *** practical purposes,apart from the ex-perimental 8b binding energy of 137 keV,three more arbitrarily chosen values(1,0.1,0.01 keV)are *** is first shown that the Coulomb barrier between the core and the proton prevents the^(7)be+p system from reaching the state of an open proton-halo system,w hich,among other factors,would require the ground-state wave function to extend to infinity in the asymptotic region,asε0→*** elastic scattering cross section,which depends on the density of the ground-state wave function,is found to have a negligible dependence on the binding energy in this *** total,Coulomb and nuclear breakup cross sections are all reported to increase significantly fromε0=137 to 1.0 keV,and converge to their maximum values asε0→*** increase is mainly understood as coming from a longer tail of the ground-state wave function forε0≤1.0 keV,compared to that forε0=137 *** is also found that the effect of the continuum-continuum couplings is to slightly delay the convergence of the breakup cross *** analysis of the reaction cross section indicates a convergence of all the breakup observables asε0→*** results provide a better sense of the dependence of the breakup process on the breakup threshold.

关键词： proton halo breakup cross section breakup threshold

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Non-Static Plane Symmetric Zeldovich Fluid Model In Scale Invariant Theory

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Chinese Physics Letters 2004年第12期21卷 2359-2361页

作者： b.Mishra DepartmentofMathematics TheICFAIInstituteofScienceandTechnologyBhubaneswar751023India

The perfect fluid distribution in scale invariant theory of gravitation is studied, when the spacetime is described by non-static plane symmetric metric with a time-dependent gauge function. The Zeldovich model of the... 详细信息

关键词： Gravitation and cosmology Astrophysics and astroparticles

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Computer Simulation of IT-diagrams of Steel

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材料热处理学报 2004年第05B期25卷 706-709页

作者： b. Smoljan Faculty of Engineering Materials Science and Engineering Vukovarska 58 51000 Rijeka Croatia

Computer simulation of austenite decomposition has been investigated. The inversion method of prediction of phase portion in steel based on hardenability curve of /o/m’/ry-specimen has been established. The designed method of prediction austenite decomposition has been used in computer simulation of isothermal transformation (IT) diagram of low alloyed steel. IT-diagrams of low alloyed steel can be successfully predicted by proposed method of computer simulation.

关键词：计算机模拟奥氏体分解淬火转变图低合金钢

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Study of D_s~±→μ~±V_μ at belle

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Chinese Physics C 2008年第6期32卷 495-498页

作者： b.Golob Jozef Stefan Institute and Faculty of Mathematics and Physics Univ.of LjubljanaLjubljanaSlovenia

We present a preliminary measurement of the b（Ds→μvu） with the belle experiment at the KEKb collider. We select Ds →μvu decays with a method that provides a high-purity of the selected sample and an absolute measurement of the branching fraction. The results are based on a data sample of 550 fb^-1 and are compared to similar measurements by other experiments as well as to the predictions of LQCD. We conclude with short prospects for improvements in the accuracy of the measurement.

关键词： meson decays leptonic decays decay constant lattice QCD

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Pattern Formation Around Interacting bodies in Rotating Fluids

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Journal of Thermal Science 2006年第2期15卷 132-134页

作者： Karl bHLER University of Applied Sciences badstrasse 24 D-77652 Offenburg Germany

The interaction of bodies like spheres and disks in rotating fluids leads to novel flow structures. The primary swirling flow in circumferential direction is superimposed by a secondary motion in the meridional plane. The flow is visualized by introducing ink through a hole in the center of the axes and distributed radially in the central plane between the interacting bodies. The flow structure depends on the shape of the bodies, their geometrical arrangement and the Reynolds number given by the rotational speed. The observed flow structures gave rise to further investigations with PIV-measurcments and numerical simulations.

关键词： Rotating fluids pattern formation recirculation zones interacting bodies flow visualization

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Analytical evaluation of the plasma dispersion function for a Fermi-Dirac distribution

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Chinese Physics b 2012年第5期21卷 400-404页

作者： b.A.Mamedov Department of Physics Faculty of Arts and SciencesGaziosmanpa sa University

An efficient method for the analytic evaluation of the plasma dispersion function for the Fermi-Dirac distribution is *** new method has been developed using the binomial expansion theorem and the Gamma *** general formulas obtained for the plasma dispersion function are utilized for the evaluation of the response *** resulting series present better convergence *** acceleration techniques are combined to further improve the *** obtained results for the plasma dispersion function are in good agreement with the known numerical data.

关键词： Fermi Dirac distribution plasma dispersion function binomial coefficients incompletegamma functions

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