简介:TernarymetalchalcogenidesemiconductorAg8SnS6,whichisanefficientphotocatalystundervisiblelightradiation,isstudiedbyplane-wavepseudopotentialdensityfunctionaltheory.Aftergeometryoptimization,theelectronicandopticalpropertiesarestudied.Ascissoroperatorvalueof0.81eVisintroducedtoovercometheunderestimationofthecalculationbandgaps.Thecontributionofdifferentbandsisanalyzedbyvirtueoftotalandpartialdensityofstates.Furthermore,inordertounderstandtheopticalpropertiesofAg8SnS6,thedielectricfunction,absorptioncoefficient,andrefractiveindexarealsoperformedintheenergyrangefrom0to11eV.TheabsorptionspectrumindicatesthatAg8SnS6hasagoodabsorbencyinvisiblelightarea.Surfaceenergiesandworkfunctionsof(411),(413),(211),and(112)orientationshavebeencalculated.TheseresultsrevealthereasonforanoutstandingphotocatalyticactivityofAg8SnS6.
简介:背景:纳米Ag-SiO2目的:将人前列腺部尿道上皮细胞置于纳米Ag-SiO导尿管抗菌作用突出,明显减少了长期留置尿管所致的泌尿系感染。在追求纳米银医疗产品优异抗菌性的同时,人们也越来越重视其生物安全性。2导尿管浸提液中培养,评价纳米Ag-SiO2方法:分别以普通导尿管浸提液、纳米Ag-SiO导尿管的生物学安全性。2结果与结论:纳米Ag-SiO导尿管浸提液及普通细胞培养液培养前列腺增生症患者前列腺部尿道上皮黏膜细胞,培养2,5,7d,通过四甲基偶氮唑盐比色法(MTT),用酶标仪测定各培养间期各组体外细胞的吸光度值,计算细胞相对增殖率,同时通过倒置显微镜观察细胞的形态、生长和增殖情况,定量和定性地进行毒性评价及比较。2导尿管浸提液细胞毒性为1级,普通导尿管浸提液细胞毒性为0、1级,细胞相对增殖率组别效应无统计学差异(F=0.544,P=0.475);细胞相对增殖率时间效应有统计学差异(F=3.031,P=0.086);组间与时间之间交互作用无统计学差异(F=0.130,P=0.879)。结果表明纳米Ag-SiO2导尿管对不同培养间期细胞的生长繁殖影响微弱,符合医疗器械生物学评价标准。
简介:采用铸锭冶金以及形变热处理工艺,制备了不同Cu,Mg含量的Al-xCu—yMg-0.6Ag合金。通过拉伸性能测试、差热分析(DSC)以及扫描电镜(SEM)与透射电镜(TEM)分析,研究Cu,Mg含量对合金组织与力学性能的影响。结果显示:增加Cu与Mg的含量,能提高基体合金的时效硬化效果与抗拉强度。185℃峰时效时,Al-xCu—yMg-0.6Ag合金的主要强化相由片状Ω相和少量θ’相组成。随着Cu含量的增加,峰时效态合金中Ω相体积分数增大。增加Mg的含量,能加速合金的时效硬化过程,减小Ω相的尺寸。
简介:本文利用XRF金标样的多元素回归方程,对Pt、Pd的荧光强度进行修正,修正后的荧光强度当作Au、Ag的荧光强度代入回归方程中,利用计算机编程计算铂制品中的Pt、Au、Pd、Ag、Cu、Ni等6种元素的含量.该法测定的准确度优于0.5%,适用于Pt的测定范围为85%~99.92%,具有无损、快速、准确、可靠等优点.
简介:CrystallineTiO2(P25)andisolatedtitanatespeciesinaZSM-5structure(TS-1)weremodifiedwithAuandAg,respectively,andtestedinthegas-phasephotocatalyticCO2reductionunderhighpurityconditions.Thenoblemetalmodificationwasperformedbyphotodeposition.LightabsorbancepropertiesofthecatalystsareexaminedwithUV–Visspectroscopybeforeandaftertheactivitytest.Inthegas-phasephotocatalyticCO2reduction,itwasobservedthatthecatalystswithAgnanostructuresaremoreactivethanthosewithAunanostructures.Itisthusfoundthattheenergeticdifferencebetweenthebandgapenergyofthesemiconductorandthepositionoftheplasmonisinfluencingthephotocatalyticactivity.Potentially,plasmonexcitationduetovisiblelightabsorptionresultsinplasmonresonanceenergy,whichaffectstheexcitationofthesemiconductorpositively.Therefore,anoverlapbetweenbandgapenergyofthesemiconductorandmetalplasmonisneeded.
简介:EffectofaddedCo2+(aq)oncopperelectrowinningwasstudiedusingdopedpolyaniline(Pani)andPb-Ag(1%)anodesandastainlesssteelcathode.ThepresenceofaddedCo2+(aq)intheelectrolytesolutionwasfoundtodecreasetheanodepotentials.TheoptimumlevelofCo2+(aq)concentrationintheelectrolyte,withrespecttothemaximumsavingofpowerconsumptionwasestablished.Linearsweepvoltammetry(LSV)wasusedtostudytheinfluenceofaddedCo2+(aq)ontheanodicprocessesinacoppersulfate-sulfuricacidelectrolyte.Theoxygen-evolutionpotentialforPanianodeisdepolarisedatlowercurrentdensities(≤0.01A/cm2)andattainssaturationatρ(Co2+)o≈0.789g/L;whilsttheoxygen-evolutionpotentialforPb-Ag(1%)anodeisdepolarisedathighercurrentdensities(≤0.02A/cm2)andattainssaturationatρ(Co2+)o≈1.315g/L.Thepreferredorientationsofthecopperdepositschangefrom(220)to(111)withtheadditionof0.394?0.789g/LCo2+buthigherconcentrationsfavor(220)orientationagain.
简介:摘要 目的:研究对患者血清肿瘤标志物CA125(糖类抗原125)、CEA(癌胚抗原)、SCC(鳞状细胞癌抗原)等进行联合检测,观察不同肿瘤物对检测与诊断宫颈癌的临床价值。方法:调研2016年1月~2019年6月我院肿瘤科收诊的120例宫颈癌患者(A组),并抽调同期在我院进行健康体检的120例健康人群(B组),采用美国雅培贸易公司生产ARCHITECT i2000SR全自动免疫分析系统进行各指标浓度水平测定。比较两组调研人群的血清肿瘤标志物的水平变化,观察血清肿瘤标志物联合检测在确诊癌症间的临床意义。结果:A组的CA125、SCC、CEA指标水平显著高于B组,P<0.05;Ⅲ~Ⅳ期宫颈癌患者的血清的SCC、CEA、CA125水平明显高于Ⅰ期、Ⅱ期,而Ⅱ期宫颈癌患者的血清的SCC、CEA、CA125水平明显高于Ⅰ期;血清的SCC、CEA、CA125联合检测诊断宫颈癌的灵敏度、特异性显著高于各指标的单独检测标准,P<0.05。结论:血清的SCC、CEA、CA125的指标检查有利于早期宫颈癌的筛查,且各指标的联合检测可提高诊断的灵敏度及特异性。
简介:采用蒸发镀膜方法,在孔径约为200nm的多孔阳极氧化铝(AAO)模板上室温沉积名义厚度为300nm的银薄膜样品。研究真空退火对AA0模板上Ag纳米颗粒膜的结构和光学性质的影响。微观结构利用X射线衍射仪和扫描电镜观测,光学性质采用分光光度计检测。结果表明,(111)取向的银衍射峰强度随退火温度的升高逐渐增强,当退火温度为250oC时达到最大值:银纳米颗粒平均直经随退火温度的升高呈现先缓慢增大,后迅速增大,再减小的态势,当退火温度为250qC时达到最大值140nm,比制备态大47nm;薄膜经真空退火后,漫反射率普遍得到提高,在可见光区域,当退火温度为200oC时,漫反射率达到最大,其值为80%,大约为制备态的3倍左右。
简介:ToconstructtheT-DNAinsertionalmutagenesistransformationsystemforricesheathblightpathogenRhizoctoniasolaniAG-1IA,thevirulentisolateGD118ofthispathogenwasselectedasaninitialisolatefortransformation.TheconditionsfortransformationofisolateGD118wereoptimizedinfiveaspects,i.e.pre-inductiontime,co-culturetime,acetosyringone(AS)concentrationattheco-culturephase,co-culturetemperatureandpHvalueofinductionsolidmedium(ISM)attheco-culturephase.Finally,asystem...
简介:Inthiswork,thelaserinducedplasmaplumecharacteristicsandsurfacemorphologyofPt-andAg-iondepositedsiliconwerestudied.Thedepositedsiliconwasexposedtocumulativelaserpulses.Theplasmaplumeimagesproducedbyeachlasershotwerecapturedthroughacomputercontrolledimagecapturingsystemandanalyzedwithimage-Jsoftware.Theintegratedopticalemissionintensityofbothsamplesshowedanincreasingtrendwithincreasingpulses.Ag-iondepositedsiliconshowedhigheropticalemissionintensityascomparedtoPt-iondepositedsilicon,suggestingthatmoredamageoccurredtothesiliconbyAgions,whichwasconfirmedbySRIM/TRIMsimulations.Thesurfacemorphologiesofbothsampleswereexaminedbyopticalmicroscopeshowingthermal,exfoliationalandhydrodynamicalsputteringprocessesalongwiththere-depositionofthematerial,debrisandheataffectedzones’formation.ThecraterofPt-iondepositedsiliconwasdeeperbuthadlesslateraldamagethanAgiondepositedsilicon.Thenovelresultsclearlyindicatedthattheiondepositedsiliconsurfaceproducedincubationcenters,whichledtomoreabsorptionofincidentlightresultingintoahigheremissionintensityfromtheplasmaplumeanddeepercraterformationascomparedtopuresilicon.Theapproachcanbeeffectivelyutilizedinthelaserinducedbreakdownspectroscopytechnique,whichendurespoorlimitsofdetection.
简介:Thecomplexnatureoflaser-materialinteractioncausesnon-stoichiometricablationofalloysamples.Thisisattributedtomatrixeffect,whichreducesanalyzingcapability.Toaddressthisissue,theanalyticalperformanceofthreedifferentnormalizationmethods,namelynormalizationwithbackground,internalnormalizationandthreepointsmoothingtechniquesatdifferentparametersettingsisstudiedforquantificationofAgandZnbyLaserinducedbreakdownspectroscopy(LIBS).TheLIBSspectraoffiveknownconcentrationofsilverzincbinarycompositeshavebeeninvestigatedatvariouslaserirradiances(LIs).CalibrationcurvesforbothAg(I)line(4d^105s^2S1/2→4d^105p^2P1/2at338.28nm)andZn(I)line(4s5s^3S1→4s4p^3P2at481.053nm)havebeendeterminedatLIof5.86×10^10Wcm^-2.SlopesofthesecalibrationcurvesprovidethevaluationofmatrixeffectintheAg–Zncomposites.Withcarefulsamplepreparationandnormalizationaftersmoothingatoptimumparametersetting(OPS),theminimizationofsamplematrixeffecthasbeensuccessfullyachieved.AgoodlinearityhasbeenobtainedinAgandZncalibrationcurveatOPSwhennormalizedthewholeareaofspectrumaftersmoothingandtheobtainedcoefficientsofdeterminationvalueswereR^2=0.995and0.998closerto1.Theresultsofmatrixeffecthavebeenfurtherverifiedbyanalysisofplasmaparameters.BothplasmaparametersshowednochangewithvaryingconcentrationatOPS.However,athighconcentrationofAg,theobservedsignificantchangesinbothplasmaparametersatcommonparametersettingPS-1andPS-2werethegestureofmatrixeffect.Inourcase,thebetteranalyticalresultswereobtainedatsmoothingfunctionwithoptimizedparametersettingthatindicatesitismoreefficientthannormalizationwithbackgroundandinternalnormalizationmethod.