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Determination of Neutron Irradiation-Induced phosphorus Segregation on Grain Boundaries in a p-doped 2.25Cr1Mo Steel

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Journal of Materials Science & Technology 2004年第1期20卷 81-85页

作者： ShenhuaSONG R.G.Faulkner p.E.J.Flewitt DongdongSHEN JingLIU ZexiYUAN SchoolofMaterialsandMetallurgy WuhanUniversityofScienceandTechnologyWuhan430081China InstituteofpolymerTechnologyandMaterialsEngineering LoughboroughUniversityLoughboroughLeicestershireLEll3TUUK BerkeleyCentre BNFLMagnoxGenerationBerkeleyGloucestershireGL139PBUK

Irradiation-induced impurity segregation to grain boundaries is one of the important radiation effects on materials. For this reason, phosphorus segregation to prior austenite grain boundaries in a p-doped 2.25Cr1Mo steel subjected to neutron irradiation is examined using field emission gun scanning transmission electron microscopy (FEGSTEM) with energy dispersive X-ray microanalysis (EDX). The steel samples are irradiated around 270 and 400℃, respectively. The irradiation dose rate and dose are -1.05×10-8 dpa/s and -0.042 dpa respectively for 270℃ irradiation, and 1.7×10-8 dpa/s and 0.13 dpa respectively for 400℃ irradiation. The FEGSTEM results indicate that there is no apparent phosphorus segregation during 270℃ irradiation but there is some during 400℃ irradiation.

关键词： Neutron irradiation Segregation Grain boundary phosphorus

Elastic modulus and hardness of cortical and trabecular bovine bone measured by nanoindentation

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中国有色金属学会会刊：英文版 2006年第B02期16卷 744-748页

作者： HODGSON p D Centre for Material and Fibre InnovationDeakin University Geelong VIC 3217Australia

The elastic modulus and hardness of several microstructure components of dry bovine vertebrae and tibia have been investigated in the longitude and transverse directions using nanoindentation. The elastic modulus for the osteons and the interstitial lamellae in the longitude direction were found to be (24.7±2.5) Gpa and (30.1±2.4) Gpa. As it's difficult to distinguish osteons from interstitial lamellae in the transverse direction, the average elastic modulus for cortical bovine bone in the transverse direction was (19.8±1.6) Gpa. The elastic modulus for trabecular bone in the longitude and transverse direction were (20±2) Gpa and (14.7±1.9) Gpa respectively. The hardness also varied among the microstructure components in the range of 0.41-0.89 Gpa. Analyses of variance show that the values are significantly different.

关键词：牛骨弹性模量硬度骨皮质骨小梁纳米压痕法测量生物力学

production of charmonium(like) states in e^+ e^- interactions

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Chinese physics C 2008年第6期32卷 488-491页

作者： p.pakhlov Institute for Theoretical and Experimental physics B.Cheremushkinskaya25117218MoscowRussia

We present a search for new charmonium like states in e^＋e^- annihilation using the initial-state radiation and the process e^＋e^- →J/ψ D（^＊）D（^＊）. The analyses are based on a huge data sample recorded near ... 详细信息

关键词： charmonium new states e^+e^- annihilation initial state radiation

Recent progress of CERN RD50 Collaboration

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中国有色金属学会会刊：英文版 2006年第B01期16卷 133-136页

作者： p.LUUKKA Helsinki Institute of physics CERN /EPCH-1211 GenevaSwitzerland

The objective of the CERN RD50 Collaboration is to develop radiation hard semiconductor detectors for very high luminosity colliders, in particular, for the upgrade of the large hadron collider (LHC) which itself is scheduled to be operational in 2007. The approach of the RD50 has two major research lines, material engineering and device engineering. These are further subdivided into projects covering defect characterization and engineering, new detector materials, detector characterization, new detector structures and full detector systems. presently, 264 members from 53 institutes are actively participating in the RD50 Collaboration. Detectors made of defect engineered substrates, e.g. high resistivity magnetic Czochralski (MCz-Si), epitaxial silicon (Epi-Si) on Czochralski silicon (Cz-Si) substrate, intentionally thermal donor (TD) compensated p-type MCz-Si and oxygen enriched (DOFZ) silicon, have been demonstrated by the RD50 Collaboration. An overview and highlights of the results of these defect engineering techniques were given in this report.

关键词：欧洲原子能研究机构 RD50协作组辐射硬度半导体探测器成员单位研究进展直拉硅衬底

Metaheuristics-based Clustering with Routing Technique for Lifetime Maximization in Vehicular Networks

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Computers, Materials & Continua 2023年第1期74卷 1107-1122页

作者： p.Muthukrishnan p.Muthu Kannan Saveetha School of Engineering Saveetha Institute of Medical and Technical SciencesSaveetha UniversitySaveetha NagarThandalamChennai602105TamilnaduIndia

Recently,vehicular ad hoc networks(VANETs)finds applicability in different domains such as security,rescue operations,intelligent transportation systems(ITS),*** has unique features like high mobility,limited mobility patterns,adequate topologymodifications,and wireless *** the benefits of VANET,scalability is a challenging issue which could be addressed by the use of cluster-based routing *** enables the vehicles to perform intercluster communication via chosen CHs and optimal *** main drawback of VANET network is the network unsteadiness that results in minimum *** order to avoid reduced network lifetime in VANET,this paper presents an enhanced metaheuristics based clustering with multihop routing technique for lifetime maximization(EMCMHR-LM)in *** presented EMCMHR-LM model involves the procedure of arranging clusters,cluster head(CH)selection,and route selection appropriate for *** presentedEMCMHR-LMmodel uses slime mold optimization based clustering(SMO-C)technique to group the vehicles into ***,an enhanced wild horse optimization based multihop routing(EWHO-MHR)protocol by the optimization of network *** presented EMCMHR-LMmodel is simulated usingNetwork Simulator(NS3)tool and the simulation outcomes reported the enhanced performance of the proposed EMCMHR-LM technique over the other models.

关键词： Scalability VANET clustering multihop routing metaheuristics route selection fitness function

Experimental studies and phase field modeling of microstructure evolution during solidification with electromagnetic stirring

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中国有色金属学会会刊：英文版 2010年第S3期20卷 774-780页

作者： p.GERALD TENNYSON p.KUMAR H.LAKSHMI G.pHANIKUMAR p.DUTTA Department of Metallurgical and Materials Engineering Indian Institute of Technology National Facility for Semisolid Forming Department of Mechanical EngineeringIndian Institute of Science

Thixocasting requires manufacturing of billets with non-dendritic *** alloy A356 billets were produced by rheocasting in a mould placed inside a linear electromagnetic *** heat treatment was used to produce a transition from rosette to globular *** current and the duration of stirring were explored as control *** induction heating of the billet during stirring was quantified using experimentally determined thermal *** effect of processing parameters on the dendrite fragmentation was *** computational modeling of the process was performed using phase-field modeling of alloy solidification in order to gain insight into the process of morphological changes of a solid during this process.A non-isothermal alloy solidification model was used for *** morphological evolution under such imposed thermal cycles was simulated and compared with experimentally determined *** scaling using the thermosolutal diffusion distances was used to overcome computational difficulties in quantitative comparison at system *** results were interpreted in the light of existing theories of microstructure refinement and globularisation.

关键词： electromagnetic stirring non-dendritic phase field modeling microstructure

p-T path of metamorphism and U-pb monazite and zircon age of the Kitoy terrane: Implication for Neoarchean collision in SW Siberian Craton

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Geoscience Frontiers 2020年第6期11卷 1915-1934页

作者： Vasiliy p.Sukhorukov Valentina B.Savel’eva Yingde Jiang Zhiyong Li V.S.Sobolev Institute of Geology and Mineralogy SB RAS 3 Koptyuga Av.Novosibirsk630090Russia Novosibirsk State University 2 Pirogova St.Novosibirsk630090Russia Institute of the Earth Crust SB RAS 128 Lermontova St.Irkutsk664033Russia State Key Laboratory of Isotope Geochemistry Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China

The first data on p-T metamorphic conditions coupled with U-pb monazite and zircon age obtained for the Neoarchean Kitoy granulite-gneiss terrane(SW Siberian Craton).Alumina gneisses of the Kitoy terrane indicate two-staged metamorphic *** first stage of regional metamorphism(M1)occurred at high-amphibolite facies conditions at T=780-800℃ and p=8-9 *** second stage(M2)belongs to MT-HT/Lp type of metamorphism with the wide temperature interval 600-750℃ and pressure 2-4 *** age peaks were established on the basis of U-pb monazite and zircon dating in garnet-anthophyllite *** of them correspond to the Neoarchean age:the age of M1 falls into the interval of ca.2489-2496 Ma,the age of M2-ca.2446-2456 *** high-temperature metamorphism of the Kitoy block and nearly coeval granitoid magmatism can be an evidence for the Neoarchean collision in SW Siberian craton.

关键词： Siberian craton Neoarchean Kitoy terrane Metamorphism p-T path

Cryogenic and conventional milling of AZ91 magnesium alloy

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Journal of Magnesium and Alloys 2024年第6期12卷 2503-2519页

作者： Vikas Marakini Srinivasa pai p Gururaj Bolar Bhaskara p Achar Department of Mechanical Engineering Nitte(Deemed to be University)NMAM Institute of Technology(NMAMIT)Nitte 574110India Department of Mechanical and Industrial Engineering Manipal Institute of TechnologyManipal Academy of Higher EducationManipal 576104India

Use of magnesium is the need of the hour due to its low density as well as its high strength-to-weight and stiffness-to-weight ratio *** study focuses on the effectiveness of liquid nitrogen(LN_(2))assisted cryogenic machining on the surface integrity(SI)characteristics of AZ91 magnesium *** milling using uncoated carbide inserts have been performed under liquid nitrogen(LN_(2))assisted cryogenic condition and compared with conventional(dry)*** are performed using machining parameters in terms of cutting speeds of 325,475,625 m/min,feed rates of 0.05,0.1,0.15 mm/teeth and depth of cuts of 0.5,1,1.5 mm *** significant surface integrity characteristics such as surface roughness,microhardness,microstructure,and residual stresses have been *** of SI characteristics with respect to milling parameters have been identified using statistical technique such as ANOVA and signal-to-noise(S/N)ratio ***,the multi criteria decision making(MCDM)techniques such as additive ratio assessment method(ARAS)and complex proportional assessment(COpRAS)have been utilized to identify the optimal conditions for milling AZ91 magnesium alloy under both dry and cryogenic *** of LN_(2)during machining,resulted in reduction in machining temperature by upto 29%with a temperature drop from 251.2℃under dry condition to 178.5℃in cryogenic *** showed the advantage of performing cryogenic milling in improving the surface integrity to a significant *** machining considerably minimized the roughness by upto 28%and maximised the microhardness by upto 23%,when compared to dry *** speed has caused significant impact on surface roughness(95.33%-dry,92.92%-cryogenic)and surface microhardness(80.33%-dry,82.15%-cryogenic).Due to the reduction in machining temperature,cryogenic condition resulted in compressive residual stresses(maximumσ║=-113 Mpa)on the alloy *** indicate no

关键词： Magnesium alloy Cryogenic machining Roughness Microhardness Microstructure Residual stress Multi criteria decision making

Vector-valued operators, optimal weighted estimates and the C_p condition

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Science China Mathematics 2020年第7期63卷 1339-1368页

作者： María Eugenia Cejas Kangwei Li Carlos pérez Israel pablo Rivera-Ríos BCAM—Basque Center for Applied Mathematics Bilbao 48009Spain CONICET Departamento de MatematicaFacultad de Ciencias ExactasUniversidad Nacional de La PlataLa Plata 1900Argentina Department of Mathematics University of the Basque CountryBilbao 48080Spain Ikerbasque Basque Foundation of ScienceBilbao 48013Spain INMABB CONICETDepartamento de MatematicaUniversidad Nacional del SurBahia Blanca 8000Argentina

In this paper some new results concerning the C_p classes introduced by Muckenhoupt(1981)and later extended by Sawyer(1983),are *** particular,we extend the result to the full expected range p>0,to the weak norm,to other operators and to their vector-valued *** of those results rely upon sparse domination,which in the vector-valued case are provided as *** will also provide sharp weighted estimates for vector-valued extensions relying on those sparse domination results.

关键词： A_p weights quantitative estimates C_p estimates vector-valued extensions sparse domination maximal functions Calderon-Zygmund operators commutators