简介：第一原则的计算被执行学习有TiC的形态学的硼和它的关系的吸附。尽管所有低索引的TiC水晶飞机上的硼的吸附是热地有利的，它将更容易被吸附由，这被发现终止C{111}并且{011}飞机，当时不太可能被吸附由{001}。B-B簇的形成的学习显示硼adatoms在上的分发终止C(111)并且{011}飞机将是更一致的，并且adatom的散开进一步证实上述结果。根据几何学关系和不同水晶飞机的生长率，TiC上的硼的吸附将严重阻碍生长，这被推出{111}并且{011}飞机，它能让TiC长成六角形的血小板。

简介：Thedynamicbehavioroftwo-dimensionalnanostructuresisimportanttothefutureapplicationofnanodevices.Thevibrationalbehaviorsofsingle-layeredhexagonalboronnitride(h-BN)arestudiedbymoleculardynamicssimulationandcontinuumplatemodel.ThebendingstiffnessandPoisson'sratiosofh-BNalongzigzagdirectionandarmchairdirectionarecalculated.H-BNissoftercomparedwithgraphene.Thecontinuumplatemodelcanpredictthevibrationofh-BNwithfouredge-clampedboundaryconditionswell.Theelectricfieldsindifferentdirectionshaveobviousinfluenceonthevibrationofh-BN.Thenaturalfrequencyofh-BNchangeslinearlywiththeelectricfieldintensityalongthepolarizationdirection.Thenaturalfrequencyofh-BNdecreaseswiththeincreaseofelectricfieldintensityalongbothpositiveandnegativenonpolarizationdirection.Whilethenaturalfrequencyofh-BNincreaseswiththeincreaseofelectricfieldintensityalongbothpositiveandnegativetransverseelectricfield.

简介：Theeffectoftemperatureonthepropertiesofboronadsorption-desorptioninbrown-redsoil,yellowbrownsoilandcalcareousalluvialsoilofHubeiProvincewasinvestigatedwiththemobiledisplacementtechnique.TheexperimentaldataofBadsorption-desorptionamountsandreactiontimeat25and40℃werefittedbythezero-order,first-orderandparabolicdiffusionkineticequations.Theadsorptionprocesswasinconformitywiththeparabolicdiffusionlawatboththetemperatures,andthevaluesofrateconstantoftheparabolicdiffusionequationinBadsorptionwere0.138,0.124and0.105mgkg^-1min^-1/2at25℃,and0.147,0.146and0.135mgkg^-1min^1/2at40℃forthebrown-redsoil,yellow-brownsoil,andcalcareousalluvialsoil,respectively,TherelationshipbetweenamountofBdesorptionandreactiontimecouldbewelldescribedbythefirst-orderkineticequation,andthecorrespondingvaluesofrateconstantwere0.0422,0.0563and0.0384min^-1at25℃,and0.0408,0.0423and0.0401min^-1at40℃forthebrown-redsoil,theyellow-brownsoilandthecalcareousalluvialsoil,respectively.Therefore,thedesorptionprocessofBmightberelatedtotheamountofBadsorbedinsoil,Thehigherthtemperature,thelowertheamountofBadsorptionofthesamesoilinthesamereactiontime,ThevaluesoftheapparentactivationenergyofBadsorptioninthethreesoilscalculatedwiththerateconstantsofparabolicdiffusionequationwere3.27,8.44and12.99kJmol^-1,respectively,basedontheexperimentaldataofBadsorptionamountsandreactiontimeatand40℃.

简介：Thehalogenatedboron-dopeddiamond(BDD)surfaceswerereactedwithsodiumazidethroughanucleophilicsubstitutionreaction.Theresultingazide-terminatedBDDsurfaceswereusedtotriggerthe'click'reaction.Becauseoftheattractiveelectrochemicalpropertiesofferrocene-containingmolecules,suchasfastelectrontransferrates,reversibleredoxactivities,andfavorableredoxpotentials,weshowthatferrocenederivativescanbegraftedontonon-oxidizeddiamondsurfacesbyclick'chemistry'.Theseredox-activeferrocene-containinglayersonaBDDsurface,becauseoftheirabilitytostoreandreleasechargesreversibly,havethepotentialtobeusedashybridmolecular/semiconductormemorydevices.

简介：为高周波的表面的硼氮化物(BN)电影声学的波浪(锯)设备被无线电在Ti/Al/Si(111)晶片上扔频率(RF)磁控管劈啪作响。BN电影的结构被Fourier变换调查红外线(FTIR)光谱学和X光检查衍射(XRD)系列，和表面形态学和BN电影的压电的性质被原子力量显微镜学(AFM)描绘。结果证明当氮和氩的流动比率是2:18时，立方的BN(c-BN)电影与高纯净和c轴取向被扔，并且当氮和氩的流动比率是4:20时，六角形的BN(h-BN)电影与高c轴取向被扔。粒子一致、紧缩，并且粗糙分别地是1.5nm和2.29nm。h-BN电影比c-BN电影有更好压电的反应和分发。

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简介：Thispaperdescribesthealloydesignphilosophyfortheimprovementoflong-termcreepstrengthoftemperedmartensitic9Crsteel,includingweldedjoints.Thecreeplifetrisinverselyproportionaltotheminimumcreeprateεmintimestheincreaseincreepratebystraindlnε/dεintheaccelerationregionastr=1.5/[(εmin)（dlnε/dε）].Theparametersεminanddlnε/dεarecloselycorrelatedwiththetimetominimumcreepratetmandthestraintominimumcreeprateεm,whichcharacterizethecreepdeformationbehaviorinthetransientregion.Theboundaryandsub-boundaryhardeningisshowntobethemostimportantstrengtheningmechanismincreepof9Crsteelandisenhancedbyfinedispersionsofprecipitatesalongboundaries.TheadditionofboronreducesthecoarseningrateofM23C6carbidesalongboundariesnearprioraustenitegrainboundariesduringcreep.Theenhancementofboundaryandsub-boundaryhardeningincreasesthetmanddecreasestheεmin,whichimprovesthecreeplife.Theboundaryandsub-boundaryhardeningissignificantlyreducedinfine-grainedregionofheataffected-zone（HAZ）ofconventionalsteelP92weldedjoints,promotingTypeⅣfracture.InNIMS9Crboronsteelweldedjoints,thedistributionofcarbonitridesalongboundariesaresubstantiallythesamebetweentheHAZandbasemetal,suppressingtheTypeⅣfracture.

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简介：AtBaoshanIron&SteelCo.,Ltd.,cornercracksofboroncontainingLCAKsteelslabshadcausedremarkablequalitylossandmassflowdisorder.Withthehelpoffractographyandthermodynamicsanalysis,theembrittlementmechanismofthissteelgradewasstudiedandtheresultsareasfollows:①Thetransformationfromγtoαstartsattheaustenitegrainboundariesandalayerofthinferritefilmgraduallyformsaroundtheaustenitegrains.Strainconcentrationwillpreferentiallystartinsidetheferritephasewhenthestressaccumulatestoacertainlevel.②ThecoarseBNparticlesacceleratedlyprecipitatedattheγ/αinterfacesfurtherdeterioratetheductilityoftheferritefilm,andbrittlenessresultsinstrainconcentrationandmicrovoidcoalescenceinsidetheferritefilm.Thereforetheaustenitegrainboundariesarepronetointergranularfailure.③ThestoichiometryamongAl,NandBisaveryimportantfactorinfluencingthehotductilityofthissteelgrade.BycontrolingtheB-to-Natomicratiotoabove1,allNcanbefixedbyBinsteadofAl.Thuscoarse-grainedsteelisavailableandfewergrainboundariesandhigherductilitycanreducetheriskofcornercracks.④ByadjustingtheB-to-Natomicratio,BaoshanIron&SteelCo.,Ltd.successfullyreducedthenumberofcrackstonearlyonetenthofthatinthepastandthehottensiletestsconfirmedremarkableimprovementinthehotductilityofthissteel.

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简介：ThispapercarriesouttheFirstprinciplescalculationofthecrystalstructures(zincblende(B3)androcksalt(B1))andphasetransitionofboronarsenic(BAs)basedonthedensity-functionaltheory.Usingtherelationbetweenenthalpyandpressure,itfindsthatthetransitionphasefromtheB3structuraltotheB1structuraloccursatthepressureof113.42GPa.ThentheelasticconstantsC11,C12,C44,bulkmodulus,shearmodulus,Youngmodulus,anisotropyfactor,KleinmanparameterandPoissonratioarediscussedindetailfortwopolymorphsofBAs.TheresultsofthestructuralparametersandelasticpropertiesinB3structureareingoodagreementwiththeavailabletheoreticalandexperimentalvalues.

简介：Thetheoreticalexpressionoftherelationshipbetweenoptimumdopingcontentandcrystalstructureispresentedaswellasthepreparationmethods.Byusingthisexpression,theoptimumdopingcontentofsilicon-dopedboroncarbidethinfilmiscalculated.Thequantitativecalculationvalueisconsistentwiththeexperimentalresults.Thistheoreticalexpressionisalsoappropriatetoresolvetheoptimumdopingcontentforotherelectricmaterials.

简介：Thediffusionmechanismofboroninbcc-Fehasbeenstudiedbyfirst-principlescalculations.Thediffusioncoefficientsoftheinterstitialmechanism,theB–monovacancycomplexmechanism,andtheB–divacancycomplexmechanismhavebeencalculated.ThecalculateddiffusioncoefficientoftheinterstitialmechanismisD0=1.05×10-7exp（-0.75eV/kT）m2·s-1,whilethediffusioncoefficientsoftheB–monovacancyandtheB–divacancycomplexmechanismsareD1=1.22×10-6f1exp（-2.27eV/kT）m2·s-1andD2≈8.36×10-6exp（-4.81eV/kT）m2·s-1,respectively.Theresultsindicatethatthedominantdiffusionmechanisminbcc-Feistheinterstitialmechanismthroughanoctahedralinterstitialsiteinsteadofthecomplexmechanism.ThecalculateddiffusioncoefficientisinaccordancewiththereportedexperimentresultsmeasuredinFe–3%Si–Balloy（bccstructure）.Sincethenon-equilibriumsegregationofboronisbasedonthediffusionofthecomplexesassuggestedbythetheory,ourcalculationreasonablyexplainswhythenon-equilibriumsegregationofboronisnotobservedinbcc-Feinexperiments.

简介：硼(B)的增加经常被采用增加bainitic钢的hardenability。尽管它是众所周知的，那B能延迟bainitic转变动力学，B怎么在ausforming以后影响bainitic转变动力学，仍然不是清楚的。由系统的高分辨率的dilatometry测试，现在的工作表明bainitic转变动力学包括孵化时间，转变速度和转变体积部分从所有方面在ausforming以后与B增加在低C钢被加速。为没有B增加的一样的钢，相反，转变速度和转变体积部分在ausforming以后被延迟。当某硼能与脱臼交往因此提高bainite成核率，ausforming能在优先的奥氏体谷物边界减少B分离，这被建议当某硼能与脱臼交往。而且，auforming能精制bainitic捆的平均体积。基于在成核率和bainitic捆的精炼的增加之间的竞争机制，bainitic转变动力学上的B和ausforming的效果被讨论。

简介：AReviewwith56referencesonthereactionbetweenboricacidandpolyhydroxycompounds,andthedevelopmentsofboron-selectiveresins.

简介：Hydrogenthermalplasmajetwasemployedtopreparenano-sizedboronpowderwithhydrogenreductionofBCl3.Themaximumyieldofnano-sizedboronpowderswasabout50%withtheoperationalconditionsofH2/BCl3of4.5:1,totalfeedof4.9m3/h,andplasmapowerof25kW.ThesampleswereanalyzedbyX-raydiffraction（XRD）,fieldemissionscanningelectronmicroscopy（FE-SEM）,andinductivelycoupledplasma-massspectrometry（ICP-MS）,inductivelycoupledplasma-atomicemissionspectrometry（ICP-AES）,inductivecombustioninfraredabsorption（ICIA）andinfraredthermalconductivityofoxygenandnitrogenanalyzer（ITCA）.Theresultsshowthattheboronpowdershavedifferentcrystalstructureswithhigherdispersionandpurity.Theaveragediameterisabout50nm,andthepurityis90.29%orso.Thisnewtechnologycanusesimpleprocesstoproducehighqualityboronpowders,andisfeasibleforindustrialproduction.

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