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。
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:2003年已过去了一大半,Intel的帝国反击战也以800MHzFSBPertium4处理器的推出而告一段落,Intel重拳出击的结果是——第三方Pentium4芯片组的不景气,市场上只有Intel的产品可选。然而这个格局很容易就被打破了——在AMD与nVIDIA联盟的压力下.Intel重新向VIA和SiS开放了800MHzFSBPentium4处理器的授权,于是便有了VIAPT800、PT880和PT890等几款支持800MHzPentium4处理器的芯片组诞生,然而它们究竟给我们带来了哪些不一样的技术特性,我们又能从中获得些什么呢?请和我们一起走进不属于Intel的800MHzPentium4芯片组的世界。
简介:1985年Cetus公司的Mullis发明的聚合酶链反应(PolymeraseChainReaction,PCR)是现代分子生物学研究中的一项非常重要的技术,它可在短时间内在试管中获得数百万特异DNA序列的拷贝,从而很容易地对目的基因进行分析、鉴定以及其它操作。这一技术现已广泛应用于生物学的各研究领域。PCR的定量实质是核酸的体外扩增,当人们利用技术扩增出大量的特异DNA序列后,还必须对这些PCR产物进行定性或定量检测,特别是临床检验中,定量分析PCR产物可以为临床诊断、疗效观察等提供更为准确的信息。另外,在研究基因的表达调控研究中,经常利用RT-PCR定量检测某一特定的转录mRNA,因此,建立灵敏、准确、重复性好的PCR产物定量检测法是目前PCR及其相关技术研究的特点,电是定量PCR技术的基础。本文将对这一技术近年来的研究进展状况作一简要综述。
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: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:目的建立检测常见丝状真菌感染病原菌的PCR-RFLP和多重PCR方法。方法建立以PCR技术为基础的限制片段长度多态性(RFLP)方法,首先用真菌通用引物扩增丝状真菌的ITS区,然后用限制性核酸内切酶对PCR产物进行酶切。用4种丝状真菌的特异性引物建立多重PCR体系,用该体系检测单模板、双模板和三模板的扩增情况,并测定该体系的特异性和敏感性。结果用PCR-RFLP技术能够鉴别5种常见丝状真菌,多重PCR能够根据扩增片段的不同鉴别菌种,在合适的反应条件下,对单模板、双模板和三模板均能扩增出目的片段。结论PCR-RFLP和多重PCR技术能够快速鉴定丝状真菌感染病原菌,有临床应用的良好前景。
简介:TheeffectofPtandCuelectrodesontheresistiveswitchingpropertiesandfailurebehaviorsofamorphousZrO2?lmswereinvestigated.ComparedwithCu/ZrO2/Ptstructures,thePt/ZrO2/PtstructuresexhibitbetterresistiveswitchingpropertiessuchasthehigherresistanceratioofOFF/ONstates,thelongerswitchingcyclesandnarrowdistributionofOFFstateresistance(Roff).TheswitchingmechanisminthePt/ZrO2/Ptstructurecanbeattributedtotheformationandruptureofoxygenvacancy?laments;whileintheCu/ZrO2/Ptstructure,thereexistbothoxygenvacancy?lamentsandCu?laments.TheformationofCu?lamentsisrelatedtotheredoxreactionofCuelectrodeundertheappliedvoltage.TheinhomogeneousdispersiveinjectionofCuionsresultsinthedispersiveRoffandsigni?cantdecreaseofoperatevoltage.Schematicdiagramsoftheformationofconductive?lamentsandthefailuremechanismintheCu/ZrO2/Ptstructuresarealsoproposed.