简介:钾和磷酸盐被酸水解作用过程在低温度提取分解联系的磷和钾矿石的一种新类型。影响溶解率的主要因素被调查,例如磨上好,硫磺的酸的数量和氟化物盐,反应时间和温度,等等。同时,可溶的钾和磷酸盐的形成上的各种各样的因素的效果也被讨论。反应产品和残余被X光检查衍射(XRD)决定,扫描电子显微镜(SEM)分析和其它工具。结果证明分别地,钾和磷的溶解率在95.64wt%lessthan的一种谷物尺寸的条件下面是70wt%和93.7wt%0.074公里,9.78gg-1硫磺的酸,0.5gg-1铵氟化物,160桴???瑳畲瑣牵獥椠?慭湩慴湩摥映牯戠瑯??愠摮吠?湩楣敤瑮瀠汯牡穩瑡潩?愠摮映牯愠杮敬?景椠据摩吗??
简介:TheRichHelpthePoorMoreandmorewealthyregionsandbusinesspeopleareparticipatinginthecampaignagainstpoverty,andhavemadeconsiderab...
简介:Potassiumα-andβ-trivanadoenneatungstogermanateswerepreparedandcharacterizedbymeansofelementalanalysis,IR,51Vand183WNMRspectraandpolarography.Thesinglecrystalstructureofa-isomerwasdetermined.ThefinalRis0.083.TheresultsshowthattwopreparedheteropolyanionshaveKegginstructure,anda-isomerbelongstoA-typeandhasstrongeroxidizingabilitythanβ-isomer.
简介:GypsumcrystallizationalongwiththesimultaneousregenerationofKClwasinvestigatedbythereactionofCaCl2solutionwithK2SO4.WelldevelopedsheetstructuregypsumcrystalswereproducedwhenK2SO4solutionwasaddedintotheCaCl2solutionbyslowtitrationorinmultiplestagesover2-8hfollowedby2hequilibration.InordertoregenerateKClsolutionasconcentratedaspossible,K2SO4solidwasaddedintothegivenCaCl2solutioninsteadofK2SO4solution,obtaininggypsumcrystalswithalmostthesamequalitybymultistageadditionwith[SO42-]/[Ca2+]molarrationolargerthan0.8.However,impurityofK2SO4·CaSO4·H2OwasdetectedbyXRDandwasfurtherconfirmedbySEM-EDSintheproducedcrystalswhenthe[SO42-]/[Ca2+]ratioincreasedto1.1.ItisprovedthatappearanceofthedoublesulfateisattributedtotherelativelyhighconcentrationofK2SO4.So,itisessentialtoproperlycontrolthe[SO42-]/[Ca2+]ratioandmakesure[Ca2+]inexcesstosuppressthesolubilityofCaSO4evenattheexpenseoflowcalciumremovalrate.
简介:同时的多元素抽取全球一直在增加改进测试质量和效率的土壤实验室。这研究寻求了为可得到的土壤的同时的抽取调查Mehlich-1,Mehlich-3,和树脂方法的适用性象为庄稼在滋养的建议上使用变换方程的效果一样的P,K,Ca,和Mg。表层土(0–;20厘米)样品从与大量化学、物理、矿物学的性质在南部的巴西为庄稼生产使用的最代表性的土壤类型被拿。土壤P,K,Ca,和Mg同时用1.0摩尔L−被提取;1KCl,Mehlich-1和Mehlich-3答案,和膜树脂。平均,与Mehlich-1方法提取的P的数量是50%比与树脂和Mehlich-3方法提取的那些低。然而,树脂方法提取了K,Ca,和Mg的最低数量。变换方程的使用是合适的,它没否定地为在南部的巴西的土壤上种的庄稼影响K建议。
简介:ObjectivesToinvestigatesafetyandeffectivityofpotassiuminpreventionofrestenosisafterPTCA.MethodsEightypatientswithPTCAwererandomizedintotwogroups:Controlgroup(GroupⅡn=40)withconventionaltherapy;Treatmentgroup(GroupⅠn=40)withconventionaltherapyplusoralpotassium(Slow-K1.2g,q8h,given3daysbeforePTCAandcontinuedtotheendofsub-study).Observationindecesoftwogroupswerecomparedinfollow-up.ResultsSeventy-sevenpatientswerefollowed-up(39ingroupⅠ,38ingroupⅡ)Allbloodindices(includingfat,sugar,uricacid,cretonne,Na+,Cl-,Ca2+,Mg2+)exceptbloodpotassiuminbothgroupsweresimilar.Oralpotassiumcouldincreasebloodpotassiumlevelabout0.3mmol/LingroupⅠwithoutcausinganysideeffects.SuspiciousanginapectorisandevidenceofmyocardialischemiabyETTweredevelopedingroupⅡhad14patients(28.9%)andGroupIhad7patients(17.9%);6of17patients(35.3%)ingroupⅠand11of21patients
简介:Inthisstudy,Nocolokeutecticflux,usedwidelyintheprocessofthebrazingofaluminumanditsalloy,waspreparedbythereactionbetweenAl(OH)3/KOHresolutionandHF.AseriesofKF-AlF3eutecticproductionsatvariousreactiontemperatureswereprepared.Themeltingpointsoftheproductsweremeasuredbydifferentialthermalanalysis(DTA),andthecompositeswerecharacterizedbyX-raydiffraction(XRD).TheresultssuggestthatthetemperaturecontrolisimportanttoproduceanidealfluxconsistingofK2AlF5,H2OandKAlF4,withalowmeltingpointof560℃,whichissuitableforthebrazingofaluminumanditsalloyasthealuminumfluxes.
简介:TheIndiancivilizationhasthusfarexperiencedthreephasesofancient,medievalandmodernstagesandisnowenteringsteadilytherealmodernstageinthetruesenseoftheterm.Afterfurtheradvancesinanotherfivetotendecades,theIndiancivilizationwillsurelyappearinanewvigorouslookofprosperityandstrength,boastingbothtraditionalsplendorandmodernwonders.
简介:Apotexperimentwithtworice(OrizasativaL.)genotypesdifferingininternalpotassiumuseefficiency(IKUE)wasconductedunderdifferentsodium(Na)andpotassium(K)levels.AddingNaC1ataproperlevelenhancedricevegetativegrowthandincreasedgrainyieldandIKUEunderlowpotassium.AdditionofhigherrateofNaC1hadanegativeeffectonthegrowthoftheK-efficientricegenotype,butdidnotfortheK-inefficientgenotype.Underlow-Kstress,higherNaC1decreasedIKUEoftheK-efficientricegenotypebutincreasedIKUEfortheK-inefficientgenotype.Attilleringstageandunderlow-Kstress,addingNaClincreasedKandNacontentsanddecreasedtheratioofK/Naforbothgenotypes.Atharvestingstageunderlow-Kstress,addingNaG1increasedKandNacontentsandK/NaratiofortheK-efficientgenotypebutdecreasedtheK/NaratiofortheK-inefficientgenotype.TheaccumulatedNawasmostlydepositedintherootsandsheaths.Attilleringstage,theKandNacontentsandtheK/Naratiosindifferentpartsforbothgenotypesdecreasedinthefollowingsequence:K+insheaths>K+inblades>K+inroots;Na+inroots>Na+insheaths>Na+inblades;andK/Nainsheaths》K/Nainroots.TheK-efficientgenotypehadalowerK/NaratioinrootsandsheathsthantheK-inefficientgenotypeunderlow-Kstress.Atharvestingstage,KandNacontentsingrainswerenotaffected,whereasK/NaratiointhericestrawswasincreasedfortheK-efficientgenotypebutdecreasedfortheK-inefficientgenotypebyNaaddition.However,thiswasnotthecaseunderKsufficientcondition.
简介:Themechanismofcesiumexchangeonpotassiumtitaniumhexacyanoferrate(KTiFC)isdescribedinthispaper.Thedependenceoftheexchangerateontemperature,particlegranulesize,andshakingfrequencyisstudied.Theresultsshowthationexchangeprocessiscontrolledbyliquidfilmdiffusioningranuleparticle.AnexchangereactionoccursmainlybetweenK^+intheexchangerandCs^+inthesolution.
简介:<正>1IntroductionSaltLake,asakindofchemicalresources,hasbeenattractedtomanyresearchers,especiallytheresourcesoflithium.Asreported,manykindsofbrinesexistintheworlddependingonthecompositionsofthebrine.Basedonthechemicalcompositionthebrinescanbeclassifiedasthetypesofchloride,carbonate,sulfate.Fordifferent
简介:Theβ-decaysofneutron-richcarbon,nitrogenandfluorineisotopeshavebeensys-tematicallystudiedusingtheOXBASHshellModel.Inthepsd,spsdandspsdpfmodelspace,weusetheWBPinteractiontocalculatethehalf-livesandneutronemissionprobabilitiesofneutron-richcarbonandnitrogenisotopes,respectively.WiththeUSD(W)andCWinteractions,wecalculatethehalf-livesandneutronemissionprobabilitiesofneutron-richfluorineisotopeinthesdmodelspace,respectively.Thecalculatedhalf-livesandneutronemissionprobabilitiesrepro-ducerecentexperimentaldataverywell.Itseemstoshowthattheparticlesoftheneutron-richcarbonandnitrogenisotopesaremainlyexcitedinthespsdspace.Theβ-decayof21Ntotheneutronboundstatesin21Oismostlythefirstforbiddentransitionwhichmakestheneutronemissionprobabilityincrease.Thetheoreticalcalculationofβ-decayof25Fto25NewithCWinteractionshowsthatCWinteractionisbetterthanUSDinteraction.
简介:StudyofNeutron-richHgIsotopes¥ZhangLi;ZhaoJinhua;WangJichengandZhengJiwenTheneutron-richHgisotopes205-208Hgwereproducedin...
简介:Al-richmetapelitesfromtheMashankhondaliteseriesarecharacterizedbytheassemblageSpl+Grt+Sil+Crd+Bt+Pl(An72)+Kfs+Quartz+graphite.Largeamountsofspinel+quartzassemblagesoccurasinclusionsingarnetandprismaticsillimaniteintheAl-richmetapelitesoftheMashancomplex,NEChina.ThechemicalcompositionofspinelischaracterizedbyZn-rich(XZn=0.33–0.40.XZn=Zn/Zn+Mg+Fe*)(Fe*=Fe2++Fe3+)andFe3+rich(upto0.31p.f.u.).ThecharacteristicchemicalcompositionandthemineralassociationindicatedthattheformationofspinelandquartzassemblagemaybeduetothebreakdownofZn-richstaurolite.ThegeothermobarometersstudiesshowthatthepeaktemperatureoftheMashancomplexisaround820℃andthepeakpressuresis8.0kbar.TheMashancomplexshowsatypicalorogenstyleP-Tpath.
简介:ObjectivesIschemiainducedarrhythmia(ventriculartachycardia/ventricularfibrillation)isoneofthemajorcausesofdeath.Potassiumchannelschangearelikelytoberesponsiblefortheischemia-relatedarrhythmias.Cardiacpotassiumcurrentisthemajoroutwardcurrentinvolvedincardiacrepolarization.Thepropertiesofpotassiumchannelshavebeenintensivelystudied.Here,weinvestigatedtheassociationbetweenischemiainducedarrhythmiaandpotassiumchannelsgeneticvariations.Methods23patientswithventriculartachycardia/ventricularfibrillationinducedbyischemiawereselectedasobjects.5MLperipheralbloodweretakenfromeachperson,fromwhichDNAwasextractedus-ingastandardenzymaticphenol-chloroformmethod.Candidategenes(HERG、KCNJ2、KCNQ1、Mink、Mirp1、Kir2.1、KV4.3、Kir3.1、KV1.5、Kir6.1、Kir6.2、Kir2.1)Werescreenedforpotassiumchannelsgenemutationswithdirectsequencingmethods.ResultsHere4potassiumchannelsgenemutationshavebeendiscovered.InthegenecodingfortheATP-sensitiveK~+channelssubunitKir6.2,thereisachangefromvalinetoisoleucineatthepositionof326(V326I).Attheposition448,argininesubstitutesproline(P448R)intheKC-NQ1gene.InthegeneKCNJ2twomutationshavebeenfound(P156L,Q193H).ConclusionsThisstudyimplicatedthatthereisahighrelationshipbetweenischemiainducedarrhythmiaandthemutationofpotassiumchannels.Inordertoidentifythepreciselyrelationshipthereisneedfunctionalanalysis.
简介:ObjectiveTorecordtheendocochlearpotential(EP)andcalculatepotassiumconcentration[K+]inMinipigcochleae.MethodsWeusedmulti-barreledelectrodestomeasuretheEPandthepotential,[K+].EPandpotassiumelectroderecordingweremadein9cochleaefrom5minipigstogetnormalEPvalues.ResultsTheaverageEPvalueinthecochleafromtheminipigswas77.3±14mV.Theaverage[K+]fortheminipigswas147.1±13mM.ConclusionsTheEPandpotential,[K+]inminipigsarelowerthaninthehumanandrodents.ThismaybethereasonwhyporcineABRthresholdsareslightlyhigherthanhumansandrodents.
简介:Elovich,parabolicdiffusion,powerfunctionandexponentialequationswereusedtodescribeKdesorptionkineticsof12soilsinaconstantelectricfieldofelectro-ultrafiltration(EUF),ResultsshowedthattheElovich,parabolicdiffusionandpowerfunctionequationscoulddescribeKdesorptionkineticswellowingtotheirhighcorrelationcoefficientsandlowstandarderrors;buttheexponentialequationwasnotsuitabletobeusedinthisstudyduetoitsrelativelylowcorrelationcoefficientsandrelativelyhighstandarderrors.Thisworkestablishedsuccessfullytherelationshipsbetweentheconstants(slopeorintercept)ofkineticequationsandthebarleyresponsestoKfertilizerinthemultiple-sitefieldexperimentsandK-supplyingstatusofsoilsk,theconstantsofElovich,parabolicdiffusionandpowerfunctionequationswereverysignificantlyorsignificantlycorrelatedtothesoilavailableK,relativeyieldofbarleyandKuptakeofbarleyinNPplot.ItwassuggestedthatthekineticequationconstantscouldbeusedtoestimateK-supplyingpowerofsoils.