简介:<正>利用H2S系统的分组方法,进行第二组阳离子分析时,CdS沉淀不完全,或完全不沉淀,常认为是由于酸度过高,但是在实际中,有时酸度合适,即0.3mol-l-1HCl通H2S或0.2mol-1用5%TAA时CdS也不沉淀或沉淀不完全,北师大分析比学提出:为保证CdS沉淀完全,除了必须调整酸度外,还须控制Cl-的浓度,那么Cl-浓度控制在多大范围内,才不影响CdS的沉淀呢?为此,我们做了如下的实验:1、取三支离心管,各加入0.42mol·l-1Cd(NO3)21.0ml,5%的TAAl.0ml和0.6mol·-1HNO31.9ml,然后向三支离心试管中分别加入1.0ml浓度为1.7mol,l-1,3.4mol.l-1和5.13mol.l的NaCl溶液,此时可以看至三支离心管
简介:Experimental Preparation for Searching New Nuclide 69KrExperimentalPreparationforSearchingNewNuclide69Kr¥XuXiaoji;MaRuic...
简介:Usingamicrowavegenerator,chlorinedilutedbyheliumwasdissociatedtochlorineatomsthatsubse-quentlyreactedwithhydrogenazidetoproducetheexcitedstatesofNCl(a1△).Meanwhile,moleculariodinewithcarriergasofheliumreactedwithatomicchlorinetoproduceatomiciodinewhichthenwaspumpedtoexcitedstateofI(2P1/2)byanenergytransferreactionfromNCl(a1△).Inthispaper,thechangesofNCl(a1△)andNCl(bi∑)emissionintensityispresentedwhenI2/HeisintroducedintothestreamofCl/Cl2/He/HN3/NCl(a1△)/NCl(b1∑).ThedependencesofatomiciodineI(2P1/2)onflowratesofgaseswerealsoinvestigated.TheoptimumparametersforI(2P1/2)productionaregiven.
简介:SincetheinventionofRubylaserbyMaimanin1960s,manykindsoflasersareusedwidelyindentistry.Ithasbeenprovedthatlaserirradiationcanproduceacidetchinglikesurface,thusstrengthenthebondofmaterialtoenamel.Buttheheatgeneratedduringirradiationproducesdamageondentalpulp,whichlimitsthelaserapplicationsondentalhardsurfaces.
简介:摘要Krüppel样因子(KLF)在肿瘤的发生发展中发挥极其重要的作用,同时KLF家族被证实影响肝癌细胞的增殖、分化和迁移。KLF家族中有9名成员(KLF2、KLF4、KLF5、KLF6、KLF8、KLF9、KLF10、KLF14和KLF17)可作为癌基因或抑癌基因以多种方式参与肝癌的发生发展,并有望成为肝癌的生物学治疗靶点。
简介:ConstructingareasonablereactionkineticmodelforCr-containingwasteincinerationisofhighsignificancetostudytheeffectofvariousfactors,suchastemperature,Cl,onitshexavalentchromiumcompounds.Inthispaper,aprimaryCr/H/Air/ClreactionkineticmodelisbuiltandstudiedbyGaussian03codewithquantumchemistrytheory.Numericalresultsshowthattherearetwooverallreactionsinthemodel,eachofthetwooverallreactionsconsistsoftheirrespectivetwoelementaryreactions.Sothetwooverallreactionsshouldbeomittedfromthemodel.Instead,thefourelementaryreactionsshouldbeaddedintheCr/H/Air/Clreactionkineticmodel.Theactivationenergiesofthefourelementaryreactionsarealsocalculated.
简介:Dongsha区域是为在华南海(SCS)的煤气的水合物探索的最有希望的目标区域之一。毛孔水地球化学的学习在中国煤气的水合物探索起了一个关键作用。Br/Cl,I/Cl和37毛孔水里的Cl在在低温度沉积环境跟踪煤气的水合物出现,毛孔液体的化学进化和水/岩石相互作用这里被使用。样品在2004在Dongsha区域从地点HD255PC和HD309PC被收集。在地点HD255PC,我们发现了提高的Br/Cl,I/Cl并且那么减少了在4-5m的深度的4/Cl,可能从煤气的水合物出现产生的旁边地移植的液体暗示。37Clis-0.54到+0.96,和积极37在4-5m间隔的Cl应该与在35Cl和37Cl。在地点HD309PC,旁边地移植的液体也在3-4m的深度被发现,与Br/Cltwotimes到,显示海水和减少的I/Cl,液体没有与煤气的水合物的关系。在这个地点,氯同位素的作文改变from-0.7到+1.9。额外的高Br/Cl可能与深产生的液体联系。在更高的温度和压力,液体的Br/Cl在含水的硅酸盐形成期间被提高,当时积极37Cl也与一样的机制被联系。
简介:Singlecrystal(100)InPsamplesand(0001)GaNepitaxiallayerswereirradiatedattheHeavyIonResearchFacilityinLanzhou(HIRFL)with86Krionsatroomtemperature.Theionfluencewasvariedfrom5×1010to1×1012cm?2.Additionally,thinaluminumfoilswithdifferentthickness(sometensofmicrometers)wereplacedinfrontofsomesamplestodeceleratetheSHI's.Ionbeamscanningwasusedtoirradiatethewholesamplesurfaceinauniformwayandmaintainednormalincidence.Topreventsampleheatingduringhigh-energyirradiation,thefluxwaskeptconstantbelow1.3×1010cm?2s?1.ThemodificationsofthesampleswereinvestigatedbyXRD.
简介:Thepropertiesoftherelativisticheliumfragmentsproducedininteractionsof84Krat1.8AGeVand197Auat10.7AGeVinemulsionareinvestigated.Theexperimentalresultsarecomparedwiththoseobtainedfromvariousprojectileswithemulsioncollisionsatdifferentenergies.Itisfoundthatthemultiplicitydistributionofheliumprojectilefragments(HPFs)iswelldescribedbytheKoba-Nielsen-Olesen(KNO)scalingpresentation.ThesecondMuellermomentf2oftheHPFmultiplicitydistributionisindependentoftheprojectileenergyforthesameprojectile,butitisdependentontheprojectilemassnumber.Thevalueoff2increaseswiththeincreaseofprojectilemassnumberAp.Thenegativevalueoff2,whenAp<69,meansthattheemissionofHPFsisanticorrelated,butpositivevalueoff2,whenAp>69,referstothattheemissionofHPFsiscorrelated.Thenon-zerof2momentinthisexperimentimpliesthestrongcorrelationexistingbetweentheHPFs.