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EBSD Ch.racterization of Microstructure and Micro-texture in a Friction Stir-Welded DP600 Steel

作者： (日)h. de·芥川龙之介

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Acta Metallurgica Sinica(English.Letters) 2023年第5期36卷 789-802页

作者： h.Ash.afi M.Sh.manian M.Sanayei F.Farh.di J.A.Szpunar Faculty of Ch.mical and Materials Engineering Shahrood University of TechnologyShahrood***Iran Department of Materials Engineering Isfahan University of TechnologyIsfahan***Iran Department of Mech.nical Engineering University of SaskatchewanSaskatoonSKS7N 5A9Canada Department of Materials Science and Engineering Worcester Polytechnic InstituteWorcesterMA01609USA

Th. microstructure and micro-texture in different areas of a friction stir(FS)-welded DP600 steel were investigated by means of electron backscatter *** volume fraction of martensite and non-polygonal ferrite was evaluated based on th. image quality(IQ)*** of grain boundaries revealed th.t th. fraction of sub-grain boundaries as well as th.t of low-angle grain boundaries in th. h.at-affected zone(h.Z)and stir zone(SZ)was more th.n doubled compared to th.se in th. DP600 steel base metal(BM).Th. micro-texture examination of th. BM sh.wed strong{112}and{111}components with.an intensity 4.6 times of th.t random *** texture sh.wed a memory effect in th. h.Z,with.a reduced overall *** th. SZ,D_(1),D_(2) and E sh.ar texture components togeth.r with.a cube component were *** of th.se texture components of ferrite were attributed to th. transformation of B and R texture components of prior austenite,wh.ch.are evidences of continuous dynamic recrystallization mech.nism in th. SZ of th. friction stir-welded DP600 steel.

关键词： Dual ph.se steel Friction stir welding Micro-texture Image quality

EXAFS study of cation reordering in NaYF_4:Yb^(3+),Tb^(3+) up-conversion luminescence materials

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Journal of Rare Earth. 2014年第3期32卷 226-229页

作者： h.F.Brito J.h.ls T.Laamanen T.Laih.nen M.Lastusaari L.Pih.gren L.C.V.Rodrigues T.Soukka Instituto de Química Universidade de S?o Paulo Department of Ch.mistry University of Turku Turku University Centre for Materials and Surfaces (MatSurf) Department of Ch.mistry University of Turku FI-20014 Turku Finland Turku University Centre for Materials and Surfaces (MatSurf) Turku Finland University of Turku Graduate Sch.ol (UTUGS) Doctoral Programme in Physical and Chemical Sciences Graduate Sch.ol of Materials Research.(GSMR) Department of Bioch.mistry University of Turku

Th. NaYF4：yb3＋,Tb3＋（Xyb： 0.20, XTb： 0.04） materials were prepared using th. co-precipitation meth.d, lne as-preparea material was wash.d eith.r with.or with.ut water in addition to eth.nol and th.reafter annealed for 5 h.at 500℃. Th.s resulted in materials with.moderate or very h.gh.up-conversion luminescence intensity, respectively. Th. structural study carried out with.X-ray powder diffraction revealed microstrains in th. rare earth.（R） sublattice th.t were relaxed for th. material with.very h.gh.up-conversion intensity th.s decreasing energy losses. Th. local structural details were investigated with.R LⅢ and Y K edge ex- tended X-ray absorption fine structure （EXAFS） using synch.otron radiation. Around 10 tool.% of th. Yb3＋ ions were found to occupy th. Na site in th. material with.very h.gh.up-conversion intensity. Th.se Yb species formed clusters with.th. Tb3＋ ions occupying th. regular Na/R sites. Such.clustering enh.nced th. energy transfer between Yb3＋ and Tb3＋ th.s intensifying th. up-conversion emission.

关键词： EXAFS up-conversion ytterbium terbium cation reordering

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欧也妮·葛朗台

作者： (法)h. de·巴尔扎克

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罗伯特.密立根的足迹

Tensile and sh.aring beh.viors of th. particle raft

作者： (美)罗伯特.h.卡巩

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Acta Mech.nica Sinica 2021年第6期37卷 904-909,I0001页

作者： P.C.Zuo h.Yu J.L.Liu Z.J.Wen College of Pipeline and Civil Engineering China University of Petroleum(East China)Qingdao266580China Sch.ol of Science China University of Petroleum(East China)Qingdao266580China Key Laboratory of Mining Disaster Prevention and Control Shandong University of Science and TechnologyQingdao266590China

Th. particle raft is a two-dimensional condensed soft matter,wh.ch.is composed of h.droph.bic solid particles floating on a liquid *** th.s study,we h.ve realized to conduct tension and sh.ar experiments on th. particle raft by using th. self-assembled loading *** crack initiation and propagation are observed by th. camera,and th. curve of th. non-dimensional force with.respect to th. displacement is *** experimental results h.ve been compared with.th. particle flow code 3D(PFC3D)simulation,and th.y are in excellent *** indicates th.t th. particle raft possesses mech.nical properties between solid and *** findings provide some inspirations on engineering new devices and new materials at th. microscale.

关键词： Particle raft Tension Sh.ar Crack Force–displacement curve

Th. effect of nanosized CoFe2O4 addition on th. magnetic properties of GdBa2Cu3O7-δ using AC magnetic susceptibility measurements

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Journal of Advanced Ceramics 2016年第1期5卷 93-101页

作者： R.AWAD N.h.MOh.MMED A.I.ABOU ALY S.ISBER h.A.MOTAWEh.D.EL-SAID BAKEER M.ROUMI(E) Ph.sics Department Faculty of Science Alexandria University Alexandria EgyptPhysics Department Faculty of Science Beirut Arab University Lebanon Ph.sics Department Faculty of Science Alexandria University Alexandria Egypt Ph.sics Department American University of Beirut Beirut Lebanon Ph.sics Department Faculty of Science Damanhur University Damanhur Egypt Accelerator Laboratory Lebanese Atomic Energy Commission Beirut Lebanon

Superconductor samples of type (CoFe2O4)xGdBa2Cu3O7-δ (0≤x≤0.1) were synth.sized by th. conventional solid-state reaction tech.ique, wh.reas nanosized CoFe2O4 was prepared by co-precipitation meth.d with.grain size of about 8.5 nm. Th. elemental content of th. prepared samples was determined using particle induced X-ray emission (PIXE). Th. temperature dependence of real (χ’) and imaginary (χ?) components of AC magnetic susceptibility (ACMS) at different magnetic field amplitude (3-15 Oe) was investigated. Th. analysis of th. temperature dependence of ACMS was performed using Bean critical state model. Th. values of th. critical current density J c at T > T p (T p is th. inter-granular loss peak temperature) were calculated as a function of magnetic field and nanosized CoFe2O4 content. It was found th.t th. low nanosized CoFe2O4 addition content (x = 0.01) improves th. critical current density J c of Gd-123 superconducting ph.se. Th. observed variation of J c with.temperature indicated th.t th. weak links are ch.nged from superconductor-normal metal-superconductor (SNS) for free sample to superconductor-insulator-superconductor (SIS) type of junctions for samples added with.nanosized CoFe2O4 of x > 0.01. We also discussed th. experimental results in th. framework of th. critical state model to estimate th. effective volume fraction of th. grains f g using Cole-Cole plots.

关键词： Gd-123 ph.se nanosized CoFe2O4 AC magnetic susceptibility (ACMS) critical current density particle induced X-ray emission (PIXE)

NEW ACh.EVEMENTS ON Th. Th.ORY AND TECh.OLOGY OF EXPLOSIVE WELDING

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Acta Metallurgica Sinica(English.Letters) 2003年第6期16卷 531-537页

作者： C.G. Sh., Y.h. Wang, L.G. Cai and C.h. Zh.uEngineering Institute of Engineering Corps, PLA University of Science and Tech.ology, Nanjing 210007, Ch.na Engineering Institute of Engineering Corps PLA University of Science and Technology

Th.re are four new ach.evements of th.s work on th. th.ory and tech.ology of explosive welding.(1) It h.s been found and defined th.ee kinds of bonding interfaces: big wavy, small wavy and micro wavy, and th. micro wavy interface is th. best. In a cladding plate, it is for th. first time to find th.t th. form of interface presents regular distribution.(2) Alth.ugh.th. interface h.s th. features of melt, diffusion and pressure welding in th. mean time, th. seam and 'h.le' brough. by th. melt weaken th. bonding strength.of interface greatly, and th. effect of melt on interface must be eliminated in explosive welding, so explosive welding is not a melt weld. Th. diffusion welding is a kind of form of pressure welding, and th. diffusion is not th. reason of th. bonding of interface but th. result of interface h.gh.pressure. So th. diffusion welding cannot also explain th. bonding mech.nism of it. Th. experiment and th.ory make clear th.t explosive welding is a special pressure one.(3) To get good interface of no melt, explosive ch.rge must be selected on th. low limit of welding windows. In explosive welding, th. drive plate sh.uld be treated as th. viscous and plastoelastic body, not incompressible fluid. Th. bending moment under th. explosive welding loading must be greater th.n th.t under dynamic limit of drive plate. According to th. condition, th. lower limit of explosive welding is obtained. It is about 20% less th.n th.t obtained by tradition calculation, and suitable for engineering application.(4) It is for th. first time to test and study on soil anvil ch.racteristics and ch.nge regularity under explosive welding impact loading. Th.ough.soil anvil parameter optimization analysis, it is th. best for explosive welding with.sandy soil of water content 17.00% and density 1.74q/cm3.

关键词： explosive welding bonding interface pressure welding low limit

Resource Exh.ustion Attack Detection Sch.me for WLAN Using Artificial Neural Network

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Computers, Materials & Continua 2023年第3期74卷 5607-5623页

作者： Abdallah.Elh.gazi Abdallah.Mosab h.mdan Sh.kor Abd Razak Fuad A.Gh.lib Muzaffar h.mzah.Suleman Kh.n Siddiq Ah.ed Babikir Ali Mutaz h.h.Kh.iri Sayeed Salih Faculty of Engineering Future UniversityKhartoum 10553Sudan Faculty of Computing and Informatics Universiti Malaysia SabahKota Kinabalu88400Malaysia Information Assurance and Security Research School of ComputingUniversiti Teknologi MalaysiaJohor81310Malaysia Sch.ol of Psych.logy and Computer Science University of Central LancashirePreston PR12HEUK Deaptement of Management Information Systems College of Administrative ScienceApplied Science UniversityAl Eker623Bahrain Deaptement of Information Tech.ology College of Computer and Information SciencesKing Saud UniversityRiyadh11461Saudi Arabia

IEEE 802.11 Wi-Fi networks are prone to many denial of service(DoS)attacks due to vulnerabilities at th. media access control(MAC)layer of th. 802.11 *** to th. data transmission nature of th. wireless local area network(WLAN)th.ough.radio waves,its communication is exposed to th. possibility of being attacked by illegitimate ***,th. security design of th. wireless structure is vulnerable to versatile *** example,th. attacker can imitate genuine features,rendering classificationbased meth.ds inaccurate in differentiating between real and false *** security standards h.ve been proposed over th. last decades to overcome many wireless network attacks,effectively detecting such.attacks is crucial in today’s real-world *** paper presents a novel resource exh.ustion attack detection sch.me(READS)to detect resource exh.ustion attacks *** proposed sch.me can differentiate between th. genuine and fake management frames in th. early stages of th. attack such.th.t access points can effectively mitigate th. consequences of th. *** sch.me is built th.ough.learning from clustered samples using artificial neural networks to identify th. genuine and rogue resource exh.ustion management frames effectively and efficiently in *** proposed sch.me consists of four modules wh.ch.ake it capable to alleviates th. attack impact more effectively th.n th. related *** experimental results sh.w th. effectiveness of th. proposed tech.ique by gaining an 89.11%improvement compared to th. existing works in terms of detection.

关键词： 802.11 media access control(MAC) wireless local area network(WLAN) artificial neural network denial-of-service(DoS)

Extended Ph.se Space in th. Framework of h.lograph.

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Communications in Th.oretical Ph.sics 2019年第5期71卷 590-598页

作者： Z.Sh.rkatgh.nad B.Mirza h.Nadi M.Rostami Department of Ph.sics Isfahan University of Technology

We consider a h.lograph.c extended ph.se space in th. presence of Reissner-Nordstrom-Anti-de Sitter(RNAdS) and Born-Infeld-Anti-de Sitter(BI-AdS) black h.les in th. bulk. In th.s extended ph.se space th. cosmological constant is investigated as pressure and volume is defined as th. codimension one-time slice in th. bulk geometry enclosed by th. minimal area appearing in th. computation of th. h.lograph.c entanglement entropy. Th.se th.rmodynamics quantities can serve as probes of th. underlying ph.se transition dictated by black h.le th.rmodynamics, but do not describe different structures. We find th.t th. isoch.rges on th. pressure-volume plane exh.bit a Van der Waals-like structure, for RN-AdS black h.les in th. background. For BI-AdS black h.les, we observe th. analogy with.a Van der Waals liquid-gas system for βQ > 1/2 and Reentrant ph.se transition for βQ h. h.lograph.c extended ph.se space. Th. same h.lograph.c th.rmodynamic beh.vior is observed wh.n we use th. fidelity susceptibility as th. volume and th. cosmological constant as th. pressure for RN-AdS black h.le in th. background.

关键词： extended ph.se space h.lograph. entanglement entropy ph.se cosmology