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Multiphase modeling of fluid dynamic in ladle steel operations under non-isothermal conditions

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journal of Iron and Steel Research International 2017年第9期24卷 888-900页

作者： h.Gonzalez j.A.Ramos-Banderas e.Torres-Alonso G.Solorio-Diaz c.A.hernández-Bocanegra Graduate Program in Metallurgy Morelia Technological Institute(ITM)Morelia Michoacdn 58120Mexico Graduate Program in engineering Mechanical UMSNHMorelia Michoacdn 58140Mexico cATeDRAS cONAcyT Benito JuarezCDMX 03940Mexico

A numerical simulation was performed to study the flow pattern,mixing time and open-eye slag produced by argon gas injection in an industrial scale steel ladle under non-isothermal *** liquid steel remains 5min before the injection,and thermal stratification and convective flows were *** different sequences in stages employing various argon-gas flow rates were *** the first case,a sequence with the highest flow rates of argon was applied,while in the second and the third sequences,the intermediate and the lowest flow rates of argon gas were used,*** determining the chemistry homogenization,the mixing time was computed and analyzed in all three *** was found that the cold steel is located near the walls while the steel with a high temperature is accumulated in the center of the ladle above the argon-gas *** higher and lower flows promote a faster chemistry homogenization owing to the secondary recirculations that are developed closer to the *** results from steel temperature drop show a good concordance with plant trial measurements.

关键词： Thermal stratification Mixing time Open-eye slag Ladle steelmaking Multiphase modeling

hot cracking in AZ31 and AZ61 Magnesium Alloy

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journal of Materials Science & Technology 2011年第7期27卷 633-640页

作者： c.j. huang c.M. cheng c.P. chou F.h. chen Department of Mechanical engineering National Chiao Tung University Hsinchu 300 Taiwan China Department of Industrial education National Taiwan Normal University Taipei 106 Taiwan China

This paper examined the impact of the number of thermal cycles and augmented strain on hot cracking in AZ31 and AZ61 magnesium alloy. Statistical analyses were performed. Following observation using a scanning electron microscope （SeM）, an energy dispersive spectrometer （eDS） was used for component analysis. Results showed that Al content in magnesium alloy has an effect on hot cracking susceptibility. In addition, the nonequilibrium solidification process produced segregation in Al content, causing higher liquid Mg-alloy rich Al content at grain boundaries, and resulting into liquefied grain boundaries of partially melted zone （PMZ）. In summary, under multiple thermal cycles AZ61 produced serious liquation cracking. AZ61 has higher （6 wt%） Al content and produced much liquefied Mg17Al12 at grain boundaries under multiple thermal cycles. The liquefied Mg17Al12 were pulled apart and hot cracks formed at weld metal hAZ due to the augmented strain. Since AZ31 had half the Al content of AZ61, its hot-cracking susceptibility was lower than AZ61. In addition, AZ61 showed longer total crack length （TcL） in one thermal cycle compared to that in three thermal cycles. This phenomenon was possibly due to high-temperature gasification of Al during the welding process, which resulted in lower overall Al content. consequently, shorter hot cracks exhibited in three thermal cycles. It was found the Al content of AZ31 and AZ61 can be used to assess the hot-cracking susceptibility.

关键词： Varestraint test Thermal cycles hot-cracking susceptibility Gas tungsten arc welding (GTAW) AZ31 AZ61

Taxonomy and phylogeny of dematiaceous coelomycetes

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Fungal Diversity 2016年第2期77卷 1-316页

作者： Nalin N.Wijayawardene Kevin D.hyde Dhanushka N.Wanasinghe Moslem Papizadeh Ishani D.Goonasekara erio camporesi D.jayarama Bhat eric h.c.McKenzie Alan j.L.Phillips Paul Diederich Kazuaki Tanaka Wen jing Li Narumon Tangthirasunun Rungtiwa Phookamsak Dong-Qin Dai asha j.dissanayake Gothamie Weerakoon Sajeewa S.N.Maharachchikumbura Akira hashimoto Misato Matsumura Ali hBahkali Yong Wang Department of Plant Pathology Agriculture CollegeGuizhou UniversityGuiyang 550025People’s Republic of China School of Science Mae Fah Luang UniversityChiang Rai 57100Thailand center of excellence in Fungal Research and School of Science Mae Fah Luang UniversityChiang Rai 57100Thailand Key Laboratory for Plant Diversity and Biogeography of east Asia Kunming Institute of BotanyChinese Academy of Sciences132 Lanhei RoadKunming 650201People’s Republic of China World Agroforestry centre East and Central Asia132 Lanhei RoadKunming 650201YunnanPeople’s Republic of China Microorganisms Bank Iranian Biological Resource Center(IBRC)Academic Center for EducationCulture and Research(ACECR)TehranIran A.M.B.Gruppo Micologico Forlivese Antonio CicognaniVia Roma 18ForlìItaly A.M.B.circolo Micologico Giovanni CariniC.P.314BresciaItaly Societàper gli Studi Naturalistici della Romagna C.P.144BagnacavalloRAItaly No.128/1-j Azad Housing SocietyCurcaP.O.Goa Velha 403108India Department of Botany Goa UniversityGoa 403206India Manaaki Whenua Landcare Research Private Bag 92170AucklandNew Zealand Faculty of Sciences Biosystems and Integrative Sciences Institute(BioISI)University of LisbonCampo Grande1749-016 LisbonPortugal Musée national d’histoire naturelle 25 rue MunsterL-2160 LuxembourgLuxembourg Faculty of Agriculture and Life Science Hirosaki University3 Bunkyo-choHirosakiAomori 036-8561Japan Laboratoire Interdisciplinaire des energies de Demain(LIeD) UniversitéParis Diderot5 rue Thomas-MannParis 75013France Guizhou Key Laboratory Agro-Bioengineering Guizhou UniversityGuiyangGuizhou 550025People’s Republic of China center for Research and Development of Fine chemicals of Guizhou University Guiyang 550025People’s Republic of China Scientific Affiliate Integrative Research CenterScience&EducationThe Field MuseumChicagoILUSA Guizhou Key Laboratory of Agricultural Biotechnology Guizhou Academy of Agricultural SciencesXiaohe DistrictGuiyang CityGuizhou Province 550006People’s R

t coelomycetous fungi are an artificial taxonomic group which produce conidia inside a cavity *** comprise about,1000 genera and 7000 species,which can be endophytic,pathogenic or *** classification of coelomycetes was previously based on morphology,such as the shape of conidiomata and mode of conidiogenesis,while it was treated as a distinct group *** based taxonomic studies has been used to accommodate asexual fungi in a natural classification system,resolve generic boundaries of polyphyletic genera and species complexes,as well as establish asexual-sexual ***,most of genera lack sequence data,thus,morphology based identification is still important when introducing new genera or *** this paper we illustrate,describe,and provide taxonomic notes for 235 dematiaceous coelomycetous genera,including five new genera ***,Didymellocamarosporium,Melanocamarosporium,Melnikia and *** analyses of combined sequence data are provided to show placements of dematiaceous coelomycetes in Dothideomycetes,Leotiomycetes and ***-hundred and fifty-two(65%)of genera have sequence data,thus,their taxonomic placement in a natural classification system,is listed as an ***,83 genera still lack sequence data,hence,they are treated as Ascomycota,genera incertae *** addition,separate analyses are provided where better taxonomic resolution is needed.

关键词： Asexual fungi conidiogenesis Morphology Multi-gene analyses

Development of an in vitro macrophage screening system on the immunomodulating effects of feed components

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journal of Animal Science and Biotechnology 2021年第2期12卷 639-648页

作者： S.e.Sivinski L.K.Mamedova R.A.Rusk c.c.elrod T.h.Swartz j.M.McGill B.j.Bradford Department of Animal Sciences and Industry Kansas State UniversityManhattan 66506USA Department of Diagnostic Medicine/Pathobiology Kansas State UniversityManhattan 66506USA Natural Biologics NewfieldNY 14867USA 2265K Anthony hall 474 S.Shaw LaneEast LansingMI 48824USA

Background:While feed components capable of modulating the immune system are highly sought after and marketed,often little evidence is available to support functional immune response ***,a high-throughput in vitro cell screening system was developed to test these compounds for innate immune signaling effects,using Saccharomyces cerevisiae and its cell wall components in addition to lauric acid and its esters as models in two separate *** screening system utilized RAW 264.7 murine macrophages to assess live *** cells and ***-derived cell wall componentsβ-glucan,mannan,and zymosan(a crude cell wall preparation containing bothβ-glucan and mannan).D-mannose was also evaluated as the monomer of *** also examined the effect of a saturated fatty acid(c12:0,lauric acid)and its esters(methyl laurate and glycerol monolaurate)on innate immune cell activation and cellular *** cells were transfected with a vector that drives expression of alkaline phosphatase upon promoter activation of nuclear factorκ-light-chain-enhancer of activated B cells(NFκB),a major inflammatory/immune transcription *** cells were incubated with 0.01,0.1 or 1 mg/mL of yeast compounds alone or RAW cells were challenged with LPS and then incubated with yeast *** a separate experiment,RAW cells were incubated with 0,0.5,2.5,12.5,62.5,and 312.5μmol/L of lauric acid,methyl laurate,or glycerol monolaurate alone,or RAW cells were challenged with LPS and then incubated with fatty acid ***:Treatment with zymosan orβ-glucan alone induced NFκB activation in a dose-dependent manner,whereas treatment with D-mannose,mannan,or live *** cells did ***-treatment with mannan after an LPS challenge decreased NFκB activation,suggesting that this treatment may ameliorate LPS-induced *** increases in NFκB activation were found when fatty acid treatments were applied in the absence of LPS,yet substantial reductio

关键词： Inflammation In vitro screening system NFκB

Precipitation on stacking faults in Mg–9.8wt%Sn alloy

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journal of Materials Science & Technology 2020年第10期42卷 230-240页

作者： c.Q.Liu c.he h.W.chen j.F.Nie International joint Laboratory for Light Alloys(Ministry of education) College of Materials Science and EngineeringChongqing UniversityChongqing400044China Department of Materials Science and engineering Monash UniversityVictoria3800Australia electron Microscopy center Chongqing UniversityChongqing400044PR China

In this work,we have systematically investigated precipitation ofβ’-Mg3Sn phase on intrinsic stacking faults I1 and I2 in a Mg-9.8 wt%Sn alloy using aberration-corrected scanning transmission electron *** observed I1 faults are generated by the dissociation of c+a perfect dislocations and bounded by Frank partial dislocations having a Shockley *** ofβ’on I1 involves a shear of 1/3α,similar to its formation directly from theα-Mg ***β’phase often nucleates at one end of an I1 fault due to the interaction between shear strain fields ofβ’and the Shockley component of the Frank partial at that end,and subsequently grows towards the other end of the *** theβ’reaches to the other end,the Shockley partial bounding the lengthening end of theβ’reacts with the Frank partial bounding the fault,generating an a perfect dislocation that can glide away from the precipitate and the *** observed I2 faults are generated by the dissociation of a perfect dislocations and bounded by Shockley *** ofβ’on I2 does not need a shear of 1/3α,since the pre-existing I2 fault already provides an ABcA four-layer structure ofβ’.Thickening of theβ’that has already formed on the I2 involves the successive occurrence of three crystallographically equivalent shears of 1/3αon every second(0002)αplane of theα-Mg *** this thickening mechanism is similar to that of theβ’formed directly from theα-Mg matrix,an a perfect dislocation will be produced when theβ’is thickened to eight layers,and it can again glide away from the precipitate and the fault.

关键词： heterogeneous precipitation hAADF-STeM Shockley partial dislocation Frank partial dislocation Dislocation reaction

β-cyclodextrin as a supramolecular catalyst for the synthesis of 2hindazolo[2,1-b]phthalazine-trione derivatives in water and their antimicrobial activities

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chinese chemical Letters 2017年第7期28卷 1577-1582页

作者： asha V.chate Priyanka K.Bhadke Manisha A.Khande jaiprakash N.Sangshetti charansingh h.Gill Department of chemistry Dr.Babasaheb Ambedkar Marathwada UniversityAurangabad 431004M.S.India Y.B.chavan college of Pharmacy Rafiq Zakaria CampusAurangabad 431001India

An efficient and green method has been developed for the synthesis of 2h-indazolo[2,1-b]phthalazinetriones derivatives by employing 15 mol%β-cyclodextrinvia a one-pot multicomponent reaction of aldehyde,dimedone,hydrazine hydrate with succinic anhydride/phthalic anhydride in water at 80 ℃ for first *** catalyst could be recovered and reused for four consecutive cycles without appreciable loss in catalytic activity and evaluated for in vitro antimicrobial activity against different Gram-positive and Gram-negative bacterial *** outcome of the screening study showed that compound 6d,6f and7 n exhibited excellent activity against ***,compound 6f and 6h exhibited excellent activity against ***,and compound 6c,and 6e displayed again excellent activity against Staphylococcus aureus whereas compound 7o shows excellent activity against *** and *** when compared with Ampicillin（standard control）.The results indicated that maximum compounds are moderately effective against bacterial growth and their effectiveness is highest against standard drugs.

关键词： Multicomponent reactions(McRs) Pyridazino[1 2-a]indazole-triones 2h-Indazolo[2 1-b]phthalazine-trione β-cyclodextrin Aqueous medium Green method Antimicrobial activity

Achieving ultrahigh strength and ductility in high-entropy alloys via dual precipitation

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journal of Materials Science & Technology 2023年第35期166卷 67-77页

作者： j.M.Guo B.c.Zhou S.Qiu h.j.Kong M.c.Niu j.h.Luan T.L.Zhang h.Wu Z.B.jiao Department of Mechanical engineering Research Institute for Advanced ManufacturingThe Hong Kong Polytechnic UniversityHong KongChina The hong Kong Polytechnic University Shenzhen Research Institute Shenzhen 518057China Department of Materials Science and engineering City University of Hong KongHong KongChina State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China

The strength-ductility trade-offhas been a longstanding dilemma in metallic *** we report an innovative approach to achieve a high strength-ductility synergy via dual precipitation of sheared and bypassed precipitates.(Ni_(2) co_(2) Fecr)_(96-x) Al_(4) Nb_(x)(at.%)alloys strengthened by nanoscale L12 particles and Laves precipitates were selected as a model for this study,and their precipitate microstructures and mechanical properties were thoroughly *** dual-precipitation-strengthened alloys exhibit a yield strength of more than 1400 MPa,an ultimate tensile strength of over 1800 MPa,and a uniform elon-gation of 18%,thus achieving a high strength-ductility *** analysis reveals that the nanoscale L1_(2) precipitates contribute to the strength via the particle shearing mechanism,whereas the Laves phase provides the strengthening through the Orowan bypass *** study of deformation microstruc-tures shows that the L1_(2) precipitates are sheared by stacking faults,which facilitates long-range disloca-tion gliding through the *** a result,deformation induces the formation of hierarchical stacking fault networks and immobile Lomer-cottrell locks,which effectively enhance the work hardening ca-pability and plastic stability,thereby resulting in a high ductility at high strength *** are piled-up against the interface between the Laves precipitates and matrix,which increases the work hardening capability at the early stages of plastic deformation but causes stress *** dual precipitation strategy may be useful for many other alloys for achieving superior mechanical properties for technological applications.

关键词： high-entropy alloy Dual precipitation Precipitation strengthening Deformation mechanism

Simulating canopy stomatal conductance of winter wheat and its distribution using remote sensing information

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journal of environmental Sciences 2001年第4期13卷 439-443页

作者： Zhang, j.-h. Fu, c.-b. Kanzawa, h. START Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China

The canopy stomatal movement, a plant physiological process, generally occurs within leaves but its influence on exchange of cO2, water vapor, and sensible heat fluxes between atmosphere and terrestrial ecosystem. Many studies have documented that the interaction between leaf photosynthesis and canopy stomatal conductance is obvious. Thus, information on stomatal conductance is valuable in climate and ecosystem models. In current study, a newly developed model was adopted to calculate canopy stomatal conductance of winter wheat in huang-huai-hai (h-h-h) Plain of china (31.5 - 42.7°N, 110.0 - 123.0°e). The remote sensing information from NOAA-AVhRR and meteorological observed data were used to estimate regional scale stomatal conductance distribution. canopy stomatal conductance distribution pattern of winter wheat on March 18, 1997 was also presented. The developed canopy stomatal conductance model might be used to estimate canopy stomatal conductance in land surface schemes and seems can be acted as a boundary condition in regional climatic model runs.

关键词： carbon dioxide Data reduction ecosystems heat flux Meteorology Photosynthesis Physiology Plants (botany) Remote sensing Vapors

Dynamic mechanical relaxation behavior of Zr_(35)hf_(17.5)Ti_(5.5)Al_(12.5)co_(7.5)Ni_(12)cu_(10)high entropy bulk metallic glass

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journal of Materials Science & Technology 2021年第24期83卷 248-255页

作者： L.T.Zhang Y.j.Duan T.Wada h.Kato j.M.Pelletier D.crespo e.Pineda j.c.Qiao School of Mechanics Civil Engineering and ArchitectureNorthwestern Polytechnical UniversityXi’an710072China Institute for Materials Research Tohoku UniversitySendai980-8577Japan Universitéde Lyon MATEISUMR CNRS5510Bat.B.PascalINSA-LyonF-69621Villeurbanne CedexFrance Department of Physics Barcelona Research Center in Multiscale Science and TechnologyInstitute of Energy TechnologiesUniversitat Politècnica de Catalunya08019BarcelonaSpain

Non-equiatomic high entropy bulk metallic glasses were reported recently and show unique mechanical and physical *** mechanical relaxation behavior of Zr_(35)hf_(17.5)Ti_(5.5)Al_(12.5)co_(7.5)Ni_(12)cu_(10)high entropy bulk metallic glass was investigated by dynamic mechanical analysis(DMA)and the mechanical spectra could be well described by the quasi-point defects(QPD)*** to typical metallic glasses,the intensity of theβrelaxation of Zr_(35)hf_(17.5)Ti_(5.5)Al_(12.5)co_(7.5)Ni_(12)cu_(10)high entropy bulk metallic glass is lower due to the sluggish *** the same time,the correlation factor is higher than that of conventional metallic glasses and this is ascribed to the high configuration *** parallel,physical aging below the glass transition temperature leads to a decrease of atomic mobility,caused by a decrease of the concentration of defects.

关键词： high entropy bulk metallic glass Mechanical relaxation Quasi-point defects Physical aging