简介：本文要证明不存在一个非平凡2-（v，k，3）对称设计，它的旗传递自同构群的基柱是^2F4（q2）

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简介：以银离子、3,3′,4,4′-二苯硫酮四羧酸阴离子（tdpc）和4,4′-联吡啶（bipy）,合成了一种新型化合物[十二水合（3,3,′4,4′-二苯硫酮四羧酸）（4,4′-联吡啶）水合银][Ag2（tdpc）（bipy）2][Ag2（bipy）2（H2O）].12H2O,该化合物为链状结构,Ag…Ag相互作用,bipy间的π-π相互作用和氢键作用将化合物联接为三维超分子结构.

简介：Theinteractionsof2,2’-bipyridylwiththelanthanidenitrateswerestudiedandcomplexesoftheformulaLn（NO8）8（bipy）8wereisolatedfromwater-ethanolmixedsolvent.Thecomplexeswerecharacterizedbyelementalanalysis,conductivitymeasurments,IRspectraandDAT-TGanalysis.

简介：ThecharacteristicsofsuspendedsedimentimagecanbereflectedbythecoefficientsofbiorthogonalwavelettransformofCDF(2,2).Basedonthepowerdistributionindifferentscales,anadaptivealgorithmisproposedinthispaper,wherebythecoefficientsareadjustednon-linearly.Theparticleinformationcanbewellretainedwhiletheuselessbackgroundisremoved.Inthisway,satisfactorybinaryimagecanbeobtainedforfurtheranalysisofthesedimentparticle.

简介：Toexaminetheeffectivenessofirondust-zeolitecompositeasanadsorbentfortheremovalofheavymetalionsfromaqueoussolutions,theadsorptionisotherms,thekinetic,thermodynamicandoptimumconditions,suchasinitialconcentration,pH,contacttime,adsorbentdosageandcompetitiveadsorptionconditionsofheavymetalswereinvestigated.ThecharacterizationofthecompositewascharacterizedviaFTIR,SEM,XRFandXRDmethods.Kineticresultsontheremovalofheavymetalionsfromaqueoussolutionshavebeenwelldescribedbythepseudo-second-ordermodel.TheadsorptiondataforCdandNiionswerefittedwellwiththeLangmuirandFretm-dlichisothermmodels,respectively.Themaximumadsorptioncapacitiesofirondust-zeoliteforCdandNiionswereequalto78.125and76.33mg/g,respectively.Thethermodynamicparameterssuchasenthalpy,entropyandfreeenergyofadsorptionofmetalionsweredetermined.Itwasfoundthattheprocessisendothermic,favorableandspontaneous.ThecompetitiveadsorptionabilityofheavymetalionsinthebinarysystemonthecompositeshowedthatCdionshadasynergisticeffectontheadsorotionofNiandNiionshadthenegativeeffectonCdadsorption.

简介：Ni-CobimetalliccatalystswithdifferentNi/Cocontentwerederivedfromcoldplasmajetdecompositionandreductionofhydrotalcite-likecompoundscontainingNi,Co,MgandAl,andtheircatalyticperformancewasinvestigatedwithdryreformingofmethane.Experimentalresultsshowedthatthehydrotalcite-likeprecursorscouldbecompletelydecomposedandpartlyreducedbycoldplasmajet,andtheNicontainedcatalystsexhibitedmuchhigheractivitythanthecatalystwithoutNi.Especially,thecatalystwithNi/Coratioof8/2achievednotonlythehighestconversionsof80.3%and69.3%forCH4andCO2,respectively,butalsothebeststabilityin100htesting.ThecatalystswerecharacterizedbyXRD,XPS,TEMandN2adsorptiontechniques,andtheresultsshowedthatthebetterperformanceofthe8Ni2Cobimetalliccatalystwasattributedtoitshighermetaldispersion,smallermetalparticlesize,aswellastheinteractioneffectbetweenNiandCo,whichwerebroughtbythespecialcatalystpreparationmethod.

简介：ThecompressionbehaviourofPd39Ni10Cu30P21bulkmetallicglassisivestigatedatroomtemperatureupto23.5GPausinginsituhighpressureenergydispersivex-raydiffractionwithasynchrotronradiationsource.Pressureinducedstrucuralrelaxationofthebulkmetallicglassisexhibitedwithinthepressurerange.Itisfoundthatbelowabout5GPa,theexistenceofexcessfreevolumecontributestorapidstructuralrelaxation,whichgivesrisetorapidvolumeticchange.Underhigherpressure,furtherrelaxationresultsinstructuralstiffness.

简介：采用密度泛函理论(DFT)CAM-B3LYP方法,计算研究了10个设计的Ni(salen)与Pt(salen)配合物的几何结构、电子光谱和二阶非线性光学性质.结果表明,此类配合物有较大的第一超极化率βtot,且βtot值随配体苯环对位推拉电子基团的给体-π-受体(D-π-A)作用增强而显著提高,在配体结构中存在显著D/A作用基团时,Pt(salen)系列配合物的βtot值大于Ni(salen)系列.D/A给受电子引起的电荷转移对此系列配合物βtot值的影响大于不同金属对其影响.

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简介：Twooxo-vanadium(IV)complexes,[VO(C2O4)(2,2′-bipy)(H2O)]·C2H5OH(1)andVO(C2O4)(phen)(H2O)(2),where2,2′-bipy=2,2′-bipyridyl,phen=1,10-phenanthroline,weresynthesizedaspotentialfunctionalmodelsofvanadiumhaloperoxidases(VHPOs)inmixedsolventofethanolandwateratroomtemperature.Thecomplexeswerecharacterizedbyelementalanalysis,infrared(IR),UV-VisandX-raycrystallography.Structuralanalysesshowedthatvanadiumatomwascoordinatedbyaterminaloxygen,oneoxygenatomfromcoordinatedwater,twooxygenatomsfromthecarboxylategroupofoxalicacid,andtwonitrogenatoms(N1andN2)from2,2′-bipy/phen.Centralvanadiumatomsincomplexes1and2werebothinadistorted-octahedralenvironment,andsomeintermolecularhydrogenbondinglinkageswerealsoobservedineachcomplex.BrominationreactionactivityofthetwocomplexeswasevaluatedwithphenolredasorganicsubstrateinthepresenceofH2O2,Br-andphosphatebuffer,indicatingthattheycanbeconsideredasapotentialfunctionalmodelofVHPO.Inaddition,thermalanalysiswasalsoperformedanddiscussedindetail.

简介：Thecombinationofboth4,4′-bipyridine(4,4′-bipy)anddihydrogenphosphateanionligandswithcopper(Ⅱ)resultsintheformationofanovellayeredcompoundCu(4,4′-bipy)2(H2PO4)2(H2O)2.ThecrystalstructurecomprisesdiscreteneutralCu(4,4′-bipy)2(H2PO4)2(H2O)2units.Thecopperatom,locatedonthecrystallographictwofoldaxis,iscoordinatedwithtwonitrogenatomsofterminal4,4′-bipyligandsandtwowatermoleculesattheequatorialpositions,andtwodihydrogenphosphateoxygenatomsattheaxialpositions,forminganelongatedoctahedron.Thecomplexisatwo-dimensionaldistortedrhomboidalnetworkpossessingtwokindsofrhomboidswithdimensionsofca.1.6792nm×0.3203nmand1.2778nm×0.3198nm,respectively.Thetwo-dimensionalnetworksarestackedparallellyoneachotheralongc-axistogiveanextendedthree-dimensionalchannelnetworkwithaninterlayerdistanceofca.0.5030nm.Crystaldata:triclinic,spacegroupP-1,a=1.0253(2)nm,b=1.4501(3)nm,c=0.79715(16)nm,α=97.91(3)°,β=90.99(3)°,γ=85.54(3)°,V=1.1703(4)nm3,Z=2,R=0.0892,wR=0.2451.

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简介：令R是有1的结合环,本文中给出R上某些2×2块阵的群逆的存在性及表示.

简介：Inthisarticle,theSm-dopingsinglecrystalsCa1-xSmxFe2As2（x=00.2）werepreparedbytheCaAsfluxmethod,andfollowedbyarapidquenchingtreatmentafterthehightemperaturegrowth.Thesampleswerecharacterizedbystructural,resistive,andmagneticmeasurements.ThesuccessfulSm-substitutionwasrevealedbythereductionofthelatticeparameterc,duetothesmallerionicradiusofSm3+thanCa2+.SuperconductivitywasobservedinallsampleswithonsetTcvaryingfrom27Kto44KuponSm-doping.ThecoexistenceofacollapsedphasetransitionandthesuperconductingtransitionwasfoundforthelowerSm-dopingsamples.ZeroresistivityandsubstantialsuperconductingvolumefractiononlyhappeninhigherSm-dopingcrystalswiththenominalx>0.10.Thedopingdependencesofthec-axislengthandonsetTcweresummarized.Thehigh-TcobservedinthesequenchedcrystalsmaybeattributedtosimultaneoustuningofelectroncarriersdopingandstraineffectcausedbylatticereductionofSm-substitution.

简介：N复杂的Cu2+的相互作用，有DNA的N二度(2-aminoethyl)-2,6-pyridinedicarboxamide(BAP)被agarose胶化电气泳动分析学习。结果显示BAP-Cu2+建筑群能以生理的状况支持supercoiledDNA的phosphodiester债券的劈开，哪个是3.2畤瑣潩?牯杩湩漠?敧杯慲桰捩漠楲楧?景眠湩獥吗？？

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