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简介：Thenextgenerationofadvancedlightsourcesrequiresphotonswithlargeaveragefluxandhighbrightness,whichneedsadvancedelectrongunmatchedwithexcellentphotocathodematerials.K2CsSbphotocathodehastheadvantagesofhighquantumefficiency,longlifetimeandinstantaneousresponse.ThisstudyintroducesthedesignofasetofK2CsSbphotocathodepreparationsystemsanddetailedpreparationprocessofK2CsSbphotocathodes,includingsequentialdepositionprocessandco-depositionprocess,andfinallydevelopsaK2CsSbphotocathode.Theinfluenceoflaserpoweronthequantumefficiencyisalsoinvestigated.

简介：Aseriesofsisalbasedactivatedcarbonfiberswerepreparedwithsteamactivationattemperaturefrom750℃to900℃.Theirporestructureswerecharacterizedthroughtheirnitrogenadsorptionisothermsat77Kusingdifferenttheories.Theresultsshowedthatt-plotmethodandDR-plotmethodcouldsuitablybeusedtocharacterizethemesoporestructureandthemulti-stagedistributionofporesizeofactivatedcarbonfibers.Italsoshowedthattheporesizewidenswiththeincreaseofactivationtemperature.

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简介：Syntheticgoethite(α-FeOOH)waspreparedinthelaboratoryusingamodifiedversionofBrauer’smethod.Theprocessofsteam-crystallizationwasprolongedandimpuritieswereremovedbydialysis.TheproductshavebeencharacterisedbySurfaceAreaAnalyserandScanningElectronMicroscope,andprovedtohavelargerSpecificSurfaceAreathanthatinliterature.

简介：Stroma-freehemoglobin(SFHb)waspreparedfromfreshorout-datedwholebloodbylysingredcells.Atdifferenttemperatures,pyridoxal5-phosphate(PLP)wasaddedina4:1molar-ratiototheHbtetramerfollowedbyreductionwithNaBH4underN2for16hrssubsequentcrosslinkingbyglutaraldehydeinpresenceoflysinefor14-16hrs.Yieldedsolublepyridoxalatedpolyhemoglobin(PolyHb-P).5%-20%gradientSDS-PAGEshowedthechangeoftheHbmolecularweight(MW)aftercrosslinking.GelchromatographyshowedthatthepolyHb-Phadacontinuousdistributionofmolecularweightwiththerangefromabout65,000to600,000Dalton.ThepolyHb-Psolutionprovidedanornaloxygencarryingwith23.1ofP50atpH7.24or26.1ofP50atpH7.24.

简介：TheincompactlongafterglowpigmentSrAl2O4:Eu,Dywassynthesizedbyceramicstechnology.TheagglomeratedstartingrawmaterialhadlittleeffectonthesynthesisofSrA12O4matrixthroughsolid-statereactionmethod,buttheshrinkageanddensificationwasretardedgreatlybytheagglomeratedpowderbytheformationoflargeandextensiveporenetwork.Thesinteringmechanismissurfacediffusion(withoutfluxB2O3)andgrainboundarydiffusion(withB2O3asflux)respectively,andtheas-preparedlongafterglowpigmentglowsinthedarkforover4000min.

简介：Aseriesofuncharged,anionic,cationic,andheparinizedpolyetherurethanes(PEUs)wassynthesized.ThesoftsegmentsofthesePEUswererespectivelyobtainedbypolyte-tramethyleneoxideofmolecularweight1000(PTMO-1000),polythyleneglycolofmolecularweight1000(PEG-1000),PEG-4000,andthemixtureofPEG-4000withPTMO-1000orPEG-1000.Thehardsegmentsconsistedof4,4’-methylenediphenylenediisocyanate(MDI)whichwasextendedwithethylenediamie(ED),1,4Mbutanediol(BD),N-methyldiethanolamine(MDEA),orL-Sodiumα,ε-diaminocaproate(SDAC),respectively.ThechemicalstructureofdifferentPEUswasconfirmedbynuclearmagneticresonance.Waterabsorptionsweremeasured.Theresultsshowedthattheionic,heparinizedPEUs,andthePEUscontainedPEG-4000assoftsegmentshavehigherwaterabsorptionsthanordinaryPEUs.ThePEUsbasedmainlyonPEG-4000assoftsegmentsareakindofhighhydroscopicpolymermate-rials,andtheirhydroscopicityincreaseswithPEG-4000insoftsegment.

简介：Wepresentaschemeforpreparingremotelyathree-particlepureentangledstateviaentanglementswapping,andthenwedirectlygeneralizeittothemultiparticlecase.ItisshownthatbyusingNpairsofbipartiteEPRstatesasthequantumchannel,remotepreparationofsomespeciallychosenN-particlepureentangledstatescanbeachievedfaithfullywithanN-particleorthonormalbasismeasurementandonlyNbitsofclassicalinformation.

简介：Abstract:Theprincipleofprocessingpoppedricecake,especiallybymicrowave,wasexpounded.Thentherelationsbetweenpoppingtime,materialsratio,H20contentofbiscuit-baseandthecrispdegreeandpoppingdegreeofricecakewerediscussed.Themicrowavepoppingandoil-frypoppingwerecomparedaswell.

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简介：铅镁niobate和铅泰坦的Sol-gel-derivednano粉末吃了稳固的答案(PMN磅或PMNT)从铅醋酸盐trihydrate被准备(Pb(CH3COO)2·3H2O)，镁醋酸盐trihydrate(Mg(CH3-咕咕叫)2·3H2O)，铌ethoxide(Nb(OC2H5)5)并且钛isopropoxide(Ti(OCH(CH3)2)4)。在准备过程的关键步被讨论。在粉末的水晶的阶段用X光检查衍射(XRD)被调查分析和谷物的尺寸被扫描电子显微镜学(SEM)的地排放观察。这些粉末，与好分散，特征和狭窄的谷物缩放分发(从50nm到200nm)，可以被用来准备PMNT厚电影和陶艺。

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简介：多功能的organolithium开始者在环己烷溶剂被准备。这进程以在批把丁二烯的环己烷解决方案加到萘锂与重复单位的48丁二烯生产丁二烯oligomerdilithium开始了。在首先喂，环己烷和丁二烯环己烷答案的最小的集中装载的最大值必须在V环己烷1.33VTHF和40.6cN下面被控制。然后，SnCl4被增加，最后，包含Sn原子的多功能的organolithium开始者通过联合反应被综合。实验结果证明在批增加环己烷答案在克服一些困难是有效的，例如在环己烷的萘锂的不溶解性，在开始丁二烯的萘锂的低效率。在实践，苯能被环己烷完全代替，它不能仅仅从苯减少环境污染，而且克服在苯和环己烷之间的类似的沸腾的点引起的溶剂恢复的困难。与作为开始者，有更好的橡胶的硬化表演的塑造星的答案polymerized苯乙烯丁二烯橡胶(星S-SBR)，更低的滚动抵抗和更高的湿打滑包含Sn原子的多功能的organolithium准备了抵抗被获得。