简介：Thisworkreportsafeasiblesynthesisofhighly-dispersedPtandPt-Fenanoparticlessupportedonmultiwallcarbonnanotubes(MWCNTs)withoutFeandmultiwallcarbonnanotubeswithiron(MWCNTs-Fe)whichappliedaselectrocatalystsformethanolelectrooxidation.APtcoordinationcomplexsaltwassynthesizedinanaqueoussolutionanditwasusedasprecursortopreparePt/MWCNTs,Pt/MWCNTs-Fe,andPt-Fe/MWCNTsusingFeCl24H2OasironsourcewhichwerenamedS1,S2andS3,respectively.Thecoordinationcomplexofplatinum(TOA)2PtCl6wasobtainedbythechemicalreactionbetween(NH4)2PtCl6withtetraoctylammoniumbromide(TOAB)anditwascharacterizedbyFT-IRandTGA.ThematerialswerecharacterizedbyRamanspectroscopy,SEM,EDS,XRD,TEMandTGA.TheelectrocatalyticactivityofPt-basedsupportedonMWCNTsinthemethanoloxidationwasinvestigatedbycyclicvoltammetry(CV)andchronoamperometry(CA).Pt-Fe/MWCNTselectrocatalystsshowedthehighestelectrocatalyticactivityandstabilityamongthetestedelectrocatalystsduetothattheadditionof'Fe'promotestheOHspeciesadsorptionontheelectrocatalystsurfaceatlowpotentials,thus,enhancingtheactivitytowardthemethanoloxidationreaction(MOR).

简介：Graphiteintercalationcompounds(GIC)weretestedasanexperimentalmodelforstudyingtheelectroniceffectofcarbonsupportonthecatalyticactivityandpoisoningtoleranceofPtcatalystfordirectmethanolfuelcells.TheGICsampleswithdifferentintercalationdegreeswerepreparedbyelectrolyzinggraphiteflakeinH2SO4forvaryingtheperiodsoftime.TheGIC-supportedPtcatalystwasdepositedelectrochemically.ThecatalyticactivityandpoisoningtoleranceoftheGIC-supportedPtcatalystswereevaluated.ItwasfoundthatGICwithsulfateanionasintercalatewasabletocatalyzemethanolelectrooxidation,whichcouldberelatedtothepositivechargesgeneratedonthegraphitelayeruponintercalation.Asintercalationdegreeincreased,thecatalyticactivityoftheGIC-supportedPtcatalystdecreasedwhilethepoisoningtoleranceimproved.ThissuggeststhatelectrondonationfromsupporttocatalysthadgreateffectonbothcatalyticactivityandpoisoningtoleranceofPtcatalyst.Andintercalationcanbeadoptedasanotherimportantwaytomakemodificationoncarboneouscatalystsupport.

简介：ThesinteringofPtnanoparticlesisoneofthemainreasonsforcatalystdeactivationduringthehigh-temperaturepropanedehydrogenation(PDH)reaction.Promotersandsupportshavebeenintroducedtoprolongthecatalystlife.However,itisstillnecessarytodevelopnovelcatalystswithrobuststability.Herein,thephosphorus-modifiedcarbonnanotube-supportedPtnanoparticleswereemployedforthePDHprocess.PhosphorusmodificationimprovesthePtdispersion,effectivelypromotingtheactivityofPt/P-CNTs.Additionally,thephosphorus-modifiedCNTscaninteractstronglywithPtnanoparticlesbyimprovingtheelectrontransferorhybridization,stabilizingPtnanoparticlesfromagglomeration,andsignificantlyenhancingthecatalyststability.

简介：Theaerobicoxidationofglycerolprovidesaneconomicallyviableroutetoglyceraldehyde,dihydroxyacetoneandglycericacidwithversatileapplications,forwhichmonometallicPt,AuandPdandbimetallicAu–Pt,Au–PdandPt–PdcatalystsonTiO2wereexaminedunderbase-freeconditions.PtexhibitedasuperioractivityrelativetoPd,andAu–PdandPt–PdwhileAuwasessentiallyinactive.ThepresenceofAuontheAu–Pt/TiO2catalystsledtotheirhigheractivities(normalizedperPtatom)inawiderangeofAu/Ptatomicratios(i.e.1/3–7/1),andtheonewiththeAu/Ptratioof3/1exhibitedthehighestactivity.SuchpromotingeffectisascribedtotheincreasedelectrondensityonPtviatheelectrontransferfromAutoPt,ascharacterizedbythetemperature-programmeddesorptionofCOandinfra-redspectroscopyforCOadsorption.Meanwhile,thepresenceofAuonAu–Pt/TiO2,mostlikeduetotheobservedelectrontransfer,changedtheproductselectivity,andfacilitatedtheoxidationofthesecondaryhydroxylgroupsinglycerol,leadingtothefavorableformationofdihydroxyacetoneoverglyceraldehydeandglycericacidthatwerederivedfromtheoxidationoftheprimaryhydroxylgroups.ThesynergeticeffectbetweenAuandPtdemonstratesthefeasibilityintheefficientoxidationofglyceroltothetargetedproducts,forexample,byrationaltuningoftheelectronicpropertiesofmetalcatalysts.

简介：大音阶的第五音胶化旋转涂层在Pt/Ti/SiO2/Sisubstrate上准备的Pb(Zr0.4Ti0.6)O-3电影作为最高的电极与磅或Ru被用于铁电体电容器。为thePt/PZT/Pt和Ru/PZT/Pt铁电体电容器，尽管与一样的铁电体他，不同最高的电极材料招致PZT电容器的不同性质例如疲劳，漏，残余、浸透的极化，除了PZTfilm的类似的水晶取向。在(10)10交换周期以后，Ru/PZT/Pt和Pt/PZT/Ptcapacitors的残余的极化分别地减少到70%和84%。在(8)10交换周期以后，后者的漏水流密度在积极偏爱显然增加，与前者相比。为最高的电极的Differentmaterials在PZT/top电极接口带不同条件。在PZT/electrode接口和在到充电注射的PZT/electrode接口的电极材料的氧化物的影响的氧空缺集中的Theinfluence能作为最高的电极与磅或Ru解释PZT电容器的性质的差别。

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简介：Abicentralpolymer-supportedphasetransfercatalyst,polystyrene-supportedpolyethyleneglycolandpyridiniumsalt(PS-Py-PEG-400),synthesizedwithchloromethylatedpolystyreneassupporteronwhichPEGandpyridiniumsaltwereimmobilizedsuccessively.ItscatalyticactivitywastestedforthereactionofsolidpotassiumacetateandbenzylbromidebyGCanalysis.ItwasfoundthatthebicentralcatalystperformedhigheractivitythanthemonocentralPS-PEG-400andPS-Py.

简介：从中国证监会获悉，证券市场上新的退市办法已经出台，并将于2002年1月1日起实施。在新的退市办法中，取消了PT制度。上市公司暂停上市后，股票即停止交易，证券交易所不提供转让服务。此外，现今实行的宽限期申请的有关程序也被取消。

简介：PT（D）型喷油器是康明斯N-855型发动机配装的喷油器。它具有计时、定量和喷射的多重作用，结构上与一般的喷油器有很大的不同。为了使每次喷射时喷油器的柱塞针阀与喷嘴头中的燃油能被全部喷射出去，确保计量准确，同时避免喷油器内部积炭，要求PT（D）喷油器在每次喷射完毕后，柱塞针阀应以一定的预紧力压向喷油器嘴头，这就需要调整喷油器的压紧力，即调整喷油器的落座压力。

简介：摘要电磁式电压互感器的铁磁谐振是非有效接地系统中常见的一种现象，电磁式电压互感器引起铁磁谐振后，其介质击穿或爆炸都会导致母线故障。本文针对铁磁谐振对中性点非有效接地系统带来的影响，对电磁式电压互感器铁磁原理及现有的消谐措施进行分析，在各种情况下选择合适的消谐方式。

简介：ThemetaloxidesCuMnCeandCeYwashcoatsoncordieritewerepreparedusinganimpregnationmethod,andthenusedassupportfortheactivePtcomponenttopreparethePt/CuMnCeandPt/CeYmonolithiccatalystsforthedeepoxidationofVOCs.IncomparisonwiththePt/CeY,CuMnCe,andCeYmonolithiccatalysts,thePt/CuMnCemonolithiccatalystshowsanexcellentperformancefortoluene,ethylacetate,andn-hexaneoxidationandtheT90%islowto216,200and260℃,respectively.TheactivecomponentsPt/PtOandCuMnCeresultinabettersynergeticinteraction,whichpromotethecatalystreducibility,increasetheoxygenmobility,andenhancetheadsorptionandactivationoforganicmolecules.

简介：Somestructurealfactorstothedesignofpolymer-supportedChiralCatalystsarediscussed.andsomenewapprachesfordesigningofpolymer-supportedcatalystsarereviewedinthispaper.

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简介：说起电影下载，我们首先会想到BT、电驴、迅雷等下载方式。实际上，除此之外，目前还有一种新兴的下载方式正在日益受到广大视频爱好者，特别是高清Fans们的喜爱，这就是PT下载。那么，这个看上去还比较陌生的东东．究竟是何方神圣，它有什么让人眼球发亮的优点，我们又该怎样利用它将心仪的大片搬回家，在本文，我们将给大家一个满意的答案。

简介：Electrolysisofammoniainalkalineelectrolytesolutionwasappliedfortheproductionofhydrogen.BothPt-loadedNifoamandPt-IrloadedNifoamelectrodeswerepreparedbyelectrodepositionandservedasanodeandcathodeinammoniaelectrolyticcell,respectively.TheelectrochemicalbehaviorsofammoniainKOHsolutionwereindividuallyinvestigatedviacyclicvoltammetryonthreeelectrodes,i.e.bareNifoamelectrode,Pt-loadedNifoamelectrodeandPt-IrloadedNifoamelectrode.ThemorphologyandcompositionofthepreparedNifoamelectrodewereanalyzedbyscanningelectronmicroscopy(SEM)andX-raydiffraction(XRD).Effectsoftheconcentrationofelectrolytesolutionandtemperatureofelectrolyticcellontheelectrolysisreactionwereexaminedinordertoenhancetheefficiencyofammoniaelectrolysis.Thecompetitionofammoniaelectrolysisandwaterelectrolysisinthesamealkalinesolutionwasfirstlyproposedtoexplainthechangesofcellvoltagewiththeelectrolysisproceeding.Atvaryingcurrentdensities,differentcellvoltagescouldbeobtainedfromgalvanostaticcurves.Thelowcellvoltageof0.58V,whichislessthanthepracticalelectrolysisvoltageofwater(1.6V),canbeobtainedatacurrentdensityof2.5mA/cm2.Basedonsomeexperimentalparameters,suchastheappliedcurrent,theresultingcellvoltageandoutputofhydrogengas,thepowerconsumptionpergramofH2producedcanbeestimated.

简介：Theprocessingoffine-grainedparticleswithdiametersbetween1and10micronsisdifficultduetostrongvan-der-Waalsattractionforces.Inordertoimprovethehandlingproperties,thefine-grainedparticles,i.e.host-particles,arecoatedwithvariousnanoparticles,i.e.guest-particles.Themixingoffine-grainedpowdersisinfluencedbyparticle-particleinteractions.Iftheseforcesaredistinctivelyused,bothinteractiveandorderedmixtu.rescanbeproduced.Theseparticlemixturesconsistofcomposite-particlesthathavenewphysicalproperties.Thesemodifiedpropertiesdependstronglyonthecoatingprocess,thediameter-andmass-relationshipoftheguest-andthehost-particles.Thepropertiesofthecomposite-particlescansystematicallybeadjustedtotherequirementsofindustrialapplications.Forexample,alaboratorybubblingfluidizedbedcanbeusedtodescribetheconveyingbehaviorofthefunctionalizedhost-particles.Applicationsforthefunctionalizedparticlesareinthepharmaceuticalandthepowdercoatingindustries,e.g.enhanceddrypowderinhalersandthinlacquerfilms.Thepresentresearchcomparesthreedifferentmixing/coatingprocesses.Thecomposite-particlesarecharacterizedbyTEM,SEMandwiththeirfluidizationcharacteristics.Thecoatingprocessitselfismonitoredbytheelectrostaticchargeoftheparticles.

简介：Ageneralprocedureforconstructingmultivariatenon-tensor-productwaveletsthatgen-erateanorthogonaldecompositionofL~2(R~),s≥1,isdescribedandappliedtoyieldexplicitformulasforcompactlysupportedspline-waveletsbasedonthemultiresolutionanalysisofL~2(R~s),1≤s≤3,generatedbyanyboxsplinewhosedirectionsetconstitutesaunimodularmatrix.Inparticular,whenunivariatecardinalB-splinesareconsidered,theminimallysup-portedcardinalspline-waveletsofChuiandWangarerecovered.Arefinedcomputationalschemefortheorthogonalizationofspaceswithcompactlysupportedwaveletsisgiven.Arecursiveapproximationschemefor“truncated”decompositionsequencesisdevelopedandasharperrorboundisincluded.Aconditiononthesymmetryoranti-symmetryofthewaveletsisappliedtoyieldsymmetricbox-splinewavelets.

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