简介：Thesorptionbehaviorandmechanismofanovelchelateresin,diglycolamidicacidresin(DAAR),forSm(lll)wereinvestigated.TheoptimalsorptionconditionofDAARforSm(lll)ispH=6.0inHAc-NaAcmedium.Thestaticallysaturatedsorptioncapacityis190mg/gresinat298K.TheSm(lll)adsorbedonDAARcanbeelutedreaching100%by0.5-2.0mol/LHCIusedaseluant.Theresincanberegeneratedandreusedwithoutapparentdecreaseofsorptioncapacity.Theapparentsorptionrateconstantisk298=1.96×10^-5s^-1.Theapparentactivationenergyis26kJ/mol.ThesorptionbehaviorofDAARforSm(lll)obeystheFreundlichisotherm.Thethermodynamicsorptionparameters,enthalpychangeΔHofDAARforSm(lll)is16.9Kl/mol.ThemolarcoordinationratioofthefunctionalgroupofDAARtoSin(111)is3.ThesorptionmechanismofDAARforSm(lll)wasexaminedbyusingchemicalmethodandIRspectrometry.ThecoordinationbondwasformedbetweenoxygenatomsinthefunctionalgroupofDAARandSin(Ill).

简介：为尾鈭??，作者在未知变量u和伪考虑进化系统

简介：TheThirdWesternPacificRegionalAcousticsConference(WESTPACIII)washeldinNov.2-4,1988attheMagnollaHotelinShanghai.TheWESTPACIIIwasco-sponsoredbytheAcousticalSocietyofChina,theInstituteofAcousticsofAcademiaSinicaandtheAcousticalSocietyofShanghai.298scientistsandengineersfrom14countriesandareas,includingChina,Japan,Korea(South),India,HogngKong,NewZealand,Australia,Singapore,USA,GreatBritain,Denmark,Sweden,F.R.GermanyandIsrael,participatedintheWESTPACIII.TheopeningceremonywasheldinthemorningofNov.2.Prof.YingChongfu,Chairmanoftheorganizingcommitteemadetheopeningspeech.Intheplenaryses-sion,Prof.HiroyaFujisakifromUniv.ofTokyo,Japan,Prof.A.C.KibblewhitefromUniv.ofAuckland,NewZealandandProfWeiRongjuefromNanjingUniv.,

简介：Fivenewchloranilato-bridgedbinuclearchromium(III)complexeshavebeensynthesizedandidentifiedas[Cr2(CA)L4]-(ClO4)4[Ldenotes5-methyl-1,10-phenanthroline(Me-phen);2,9-dimethyl-1,10-phenanthroline(Me2-phen);5-chloro-1,10-phenanthroline(Cl-phen);diaminoethane(en)or1,3-diaminopropane(pn)],whereCArepresentsthedianionofchloranilicacid.Basedonelementalanalyses,molarconductivityandmagneticmomentofroom-temperaturemeasurements,andIRandelectronicspectralstudies,itisproposedthatthesecomplexeshaveCA-bridgedstructuresandconsistoftwochromium(III)ions,eachinanoctahedralenvironment.Thecomplexes[Cr2(CA)(Me-phen)4](ClO4)4(1)and[Cr2(CA)(Me2-phen)4](ClO4)4(2)werefurthercharacterizedbyvariabletemperature(4.2-300K)magneticsusceptibilitymeasurementsandtheobserveddataweresuccessfullysimulatedbytheequationbasedonthespinHamiltonianoperator,,givingtheexchangeparameterJ=-7.8cm-1for(1)andJ=-6.5cm*1for(2).Thisresult

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简介：新奇建筑群[公司(phen)2HPlP]Cl3[phen=phenanethroline，HPIP=2-(2-hydroxyphenyl)imidazo[4,5-f][l，10]phenanethroline]被元素的分析综合了，在结构上描绘了，紫外，红外和1HNMR光谱学。有小牛胸腺DNA(CTDNA)的建筑群的相互作用被学习了使用吸收和排放光谱学，DNA融化技术和周期的voltammetry。混合物看吸收hypochromicity，荧光改进和DNA融化温度增长是否有约束力到CTDNA。CV测量与DNA的增加在山峰电流在减小潜力和一个变化显示出移动。这些结果证明混合物插入到DNA基础对的地席。山峰潜力的移动显示在建筑群和DNA之间的离子相互作用模式。到DNA的混合物的有约束力的常数是4.37灳慬瑮?郥誸???蚰铧?髧??螻?趤??藥???藥薗郧芀漀椭吗？？

简介：Accordingtothewell-establishedlight-to-electricityconversiontheory,resonantexcitedcarriersinthequantumdotswillrelaxtothegroundstatesandcannotescapefromthequantumdotstoformphotocurrent,whichhavebeenobservedinquantumdotswithoutap–njunctionatanexternalbias.Here,weexperimentallyobservedmorethan88%oftheresonantlyexcitedphotocarriersescapingfromInAsquantumdotsembeddedinashort-circuitedp–njunctiontoformphotocurrent.Thephenomenoncannotbeexplainedbythermionicemission,tunnelingprocess,andintermediate-bandtheories.Anewmechanismissuggestedthatthephotocarriersescapedirectlyfromthequantumdotstoformphotocurrentratherthanrelaxtothegroundstateofquantumdotsinducedbyap–njunction.Thefindingisimportantforunderstandingthelow-dimensionalsemiconductorphysicsandapplicationsinsolarcellsandphotodiodedetectors.

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简介：ChargedparticlediagnosticsisoneoftherequiredtechniquesforimplosionarealdensitydiagnosticsattheSG-IIIfacility.Severalprotonspectrometersareunderdevelopment,andsomepreliminaryarealdensitydiagnosticshavebeencarriedout.Theresponseofthekeydetector,CR39,tochargedparticleswasinvestigatedindetail.Anewtrackprofilesimulationcodebasedonasemi-empiricalmodelwasdeveloped.TheenergyresponseoftheCR39detectorwascalibratedwiththeacceleratorprotonsandalphasfroma241Amsource.AprotonspectrometerbasedonthefilteredCR39detectorwasdeveloped,andD–Dprimaryprotonmeasurementswereimplemented.Asteprangefilterspectrometerwasdeveloped,andpreliminaryarealdensitydiagnosticswascarriedout.AwedgedrangefilterspectrometerarraymadeofSiwithahigherresolutionwasdesignedanddevelopedattheSG-IIIfacility.AparticleresponsesimulationcodebytheMonteCarlomethodandaspectraunfoldingcodeweredeveloped.Thecapabilitywasevaluatedindetailbysimulations.

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简介：Inthispaper,anewthin-layerion-exchangeresinphaseanalyticalmethodisintroduced.Itisbasedonthat,thebismuthouscationcanassociatewithiodicanions,soastoformedananioncomplex[BiI4-_]inastrongacidicenvironments.Thisanioncomplexcanalsoexchangeswithaweakeranionsonthesurfaceactivesiteofanionexchangeresin,sothata[R+][Bil4-]solidphasebinaryassociationalsystemisproduced.Owingtothesolidsystemisagreatmanydispersiveparticulates,itcanbepressedtoathin-layerbypresstoolsofthesocalled"thin-layerresinphase"or"resinphase",andusingthissolidassociationsystemspectrophotometryforthedeterminationoftracemetals.Soitcanincreasetheanalyticalsensitivity.Thisassociationsystemexhibitsmaximumabsorbanceat460nm,andobeysBeer'slawovertheconcentrationrange0.0lug/ml-l.20ug/mlofbismuthous(lll),hhasamolarabsorptivityof7.1×l^5[L/mol.cm].itindicatedtheresinphasespectrophotometryisasensitiveanalyticalmethodfortracebismuthous.Itis18timeshigherthanroutineaqueousspectrophotometry.Therelativestandarddeviationsis1.82%(n=6)fortheFfmeasurementsof0.Sug/mlBi(llO.ThedetectionlimitofBismuthous(lll)is1.4XlO~mol/L.ThemethodhasappliedtotheanalysisBi(lll)inenvironmentalwatersamples.

简介：TheSchmidtmethodisadoptedtoinvestigatethefractureproblemofmultipleparallelsymmetricandpermeablefinitelengthmode-IIIcracksinafunctionallygradedpiezoelectric/piezomagneticmaterialplane.Thisproblemisformulatedintodualintegralequations,inwhichtheunknownvariablesarethedisplacementjumpsacrossthecracksurfaces.Inordertoobtainthedualintegralequations,thedisplacementjumpsacrossthecracksurfacesaredirectlyexpandedasaseriesofJacobipolynomials.Theresultsshowthatthestress,theelectricdisplacement,andthemagneticfluxintensityfactorsofcracksdependonthecracklength,thefunctionallygradedparameter,andthedistanceamongthemultipleparallelcracks.Thecrackshieldingefectisalsoobviouslypresentedinafunctionallygradedpiezoelectric/piezomagneticmaterialplanewithmultipleparallelsymmetricmode-IIIcracks.

简介：Forthequadraticsystem:x=-y+δx+lx^2+ny^21y=x(1+ax-y)undercondtions-1<1<0,n+l-1>0theauthordrawsinthe(a,b)parameterplanetheglobalbifurcationdiagramoftrajectoriesaroundO(0,0).Noticethatwhenna^2+1<0thesystemhasonesaddleN(0,1/n)andthreeantisaddles.

简介：Thecopolymerizationsofethylenewith10-undecen-1-olhavebeeninvestigatedusingvanadiumprecatalysts,bis(imino)pyrrolylvanadium(III)complexes1-3,2,5-C4H2N(CH=NR)2VCl2(THF)2[R=C6H5(1),2,6-iPr2C6H3(2),C6F5(3)],andtheiminopyrrolylandβ-diketiminateonesforcomparison.Thepolarmonomerwaspretreatedbydiethylaluminiumchloride(presentalsoasthecocatalyst)beforethecopolymerization.ThemonomerreactivityratioswereevaluatedusingtheFineman-Rossmethod.Theligandstructureconsiderablyinfluencedthecatalyticactivityandtolerancetowardsthepolarmonomer,thepolarmonomerincorporationandthemolecularweightsoftheresultantcopolymers.Thebis(imino)pyrrolylvanadiumcomplexesexhibitedpromisingcatalyticperformanceforthecopolymerization,andahighcatalyticactivityupto3.84kg/mmolv·hwithahighcomonomerincorporationof14.0mol%wasachievedbycomplex3undermildconditions.