简介:CO2adsorptiononthesurfaceofhydrotalcite-derivedmixedoxidecatalystswasinvestigatedunderlowpressureglowdischargeplasmainopercindoconditionsviaFT-IRspectroscopy.Nickelcatalystswerepromotedwithvarioustransitionmetalspecies(Ce,Fe,La,Zr)toinfluencetheirphysico-chemicalproperties.FeandZrspeciesweresuccessfullyincorporatedintohydrotalcitebrucitelayers.AftercalcinationformedasinglephasewithNi(Mg,A1)Omixedoxide,whileLaandCespeciesformedseparatephases.ThishadaconsequenceinthedistributionofsurfacebasicsitesaswellasintheaffinitytoCOproduceduponCO2dissociationinplasma.Plasmatreatmentactivatedthesurfaceofpreparedmaterialsandchangedtheirpropertiesviathegenerationofstrongbasicsitesassociatedwithlowcoordinatedsurfaceoxygenanions.Moreover,theCO2adsorptioncapacityofpreparedmaterialsincreasedafterplasmatreatment.
简介:摘要:采用衰减全反射傅立叶变换红外光度法快速测定胃镜润滑胶浆中二甲基硅油含量,对检测过程中的不确定度产生来源进行分析和评定,建立含量计算数学模型,计算分量不确定度和合成不确定度,选择95%置信区间,获得测量结果的扩展不确定度为0.20 mg/ml。
简介:摘要目的用SEROZYME系统检测血清FT3、FT4并进行临床与实验室考核。方法将本系统与放射免疫法(RIA)进行对比研究。结果健康人(n=68)血清FT3、FT4水平(+SD)分别为4.1±1.1pmol/L、14.1±3.2pmoL/L。甲减组FT4水平下降(P<0.01);FT3水平与正常对照组无显著差异(P>0.05);初诊甲亢组FT3、FT4(P均<0.01)水平升高;糖尿病组FT3水平下降(0.05>P>0.01),FT4水平与正常对照组无显著差异(P>0.05);其它各疾病组两项指标与正常对照组均无显著差异(P均>0.05);与RIA对比检测血清FT3、FT4两法符合率分别达81.5%、74.8%;重复性批内与批间变异系数(CV)FT3分别为2.8%~5.6%、6.8%~9.0%,FT4分别为1.2%~3.4%、4.6%~7.0%;最少检量FT3为0.9pmol/L,FT4为0.1pmol/L;真实性及诊断价值FT3与FT4联合对甲亢、甲减诊断的灵敏度分别为92.2%、90.6%。特异性分别为97.1%、97.1%,总有效率均为95%;阳性预示值分别为95.9%、91.7%;阴性预示值分别为97.1%、95.7%。结论本检测系统对甲状腺功能的诊断灵敏、特异、可靠,与RIA技术相当,或有更多优点。
简介:Thisarticleputsforwarda'unifiedfieldtheory'forinternationalrelations(IR).ItfirstdividescurrentwesternIRtheoriesintohardandsoftcategories,thenpointsoutconceptualfallaciesofthethreemajordebatesinthehistoryofWesternIRtheoriesbyusingthiscategorizationasananalyticalguide.ItfurtherassertsthatsuchacategorizationshouldhelpclarifythepresenttheoreticalchaosbypursuingaunifiedIRtheoreticalsystem.