简介:TheprocesstoobtainhighT(110K)phasequickly,themicrostructureandpropertiesofAg-sheathedBi(Pb)-Sr-Ca-Cu-Osuperconductortapeshavebeenstudied.ItwasfoundthattheformationtimeofthehighTcphasewasgreatlyshortenedbytheadditionofmoreCaandCutothenominalcompositionofBi(Pb):Sr:Ca:Cu=2:2:2:3andtheadoptionofappropriatesinteringtemperatureandcoolingrate.SuperconductorpowderwithpredominanthighT,phasewaspreparedaftera840C/50htreatment.TheJoftheAg-sheathedtapesandthemagneticfielddependenceofJwereobviouslyimprovedbyrepeatedlypres-singandsintering.Themaximumtransportcurrentdensityat77Kinazeromagneticfieldwas12,200A/cm2.ThemagneticdependenceofJwassummarizedasfollows:6.450A/cm2(B⊥1.B∥S.0.1T)1,810A/cm2(B⊥1.B∥S,1T),390A/cm2(B⊥1.B∥S,2T)(B:magneticfield.1:electriccurrent.S:surfaceoftapes).TheimprovementofJwasattributedtotheformationoftheplate-likestructurewithhomogeneouscompositiondistributionandthestrongc-axistexture.
简介:[摘要]目的:分析MEBO联合EGF以及SD-Ag用于烧伤患者褥疮的治疗效果。方法:从2019年1月-2021年12月期间院内收治的烧伤褥疮患者作为研究对象,选择60例研究,根据治疗方式分组,即实验组与对照组,各30例。对照组接受SD-Ag治疗,实验组采用MEBO联合EGF治疗,对比效果。结果:实验组的止痛效果显著优于对照组,P<0.05。两组患者用药之前的创面培养,均能发现细菌的存在,对不存在差异,P>0.05。用药3天后,根据患者褥疮创面情况,进行1周细菌培养,对比实验组细菌存在率低于对照组,对比发现P<0.05。实验组的疗效显著优于对照组,P<0.05。结论:将MEBO联合EGF用于烧伤患者褥疮治疗内,可以显著改善患者的治疗效果,减少创面细菌量,并提高止痛效果。
简介:Ithaslongbeenacontroversyaboutthesourceofore-formingmaterialsofAu-Agpolymetallicdepositsbothinmetallogenictheoryandinore-searchingpractice.IntermsofalargewealthoftheisotopicstatisticsdatafromIndosinian-YanshanianendogenicoredepositsinnorthernHebei(generallyreferringtotheareasalongthenorthernpartofTaihangMountainsandnorthernHebei,thesamebelow),itisconsideredthattheore-formingmaterialscamefromthedeepinterioroftheEarth,whichhadmigratedthroughplumestotheEarthsurfacewhileex-periencedmulti-stageevolutionandthenemplacedprogressivelyinfavorablestructurallocitoformores.Theirisotopedatashowthat559sulfurisotopicdatafrom40oredepositsare,forthemostpart,withintherangeof-5‰-5‰,withahighdegreeofhomogenization,indicatingthatthesulfurisderivedmainlyfrommagma;200leadisotopedatafrom37oredepositsindi-catethattheore-formingmaterialsareprincipallyofmantlesourcethoughsomecrust-sourcema-terialwasinvolved;96oxygen,hydrogenandcarbonisotopedatafrom34oredepositsillustratethattheore-formingfluidsaredominatedbymagmaticwaterwhileothersourcesofwaterwouldbeinvolved.Itmaythereforebeseenthattheformationofendogenicdepositshasnothingtodowiththestrata.
简介:WepresentthetemperaturedependentelectricaltransportmeasurementsofAg/Si(111)-(√3×√3)R30°bytheinsitumicro-four-pointprobemethodintegratedwithscanningtunnelingmicroscopy.Thesurfacestructurecharacterizationsshowhexagonalpatternsatroomtemperature,whichsupportstheinequivalenttriangle(IET)model.Ametal-insulatortransitionoccursat-115K.Thelowtemperaturetransportmeasurementsclearlyrevealthestronglocalizationcharacteristicsoftheinsulatingphase.
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:摘要目的探讨血清肿瘤标志物癌胚抗原(CEA)、神经元特异性烯醇化酶(NSE)、细胞角蛋白19片段(CYFRA21-1)、鳞状上皮细胞癌抗原(SCC-Ag)单独或联合检测对肺癌的诊断价值。方法测定115例肺癌患者、58例肺良性疾病患者及健康对照者90例四种血清肿瘤标志物的含量水平,并计算各项目阳性率。结果肺癌组4项肿瘤标志物水平显著高于健康组和肺良性疾病组及健康对照组(P<0.01);4项标志物联合检测对肺癌的敏感性和准确性均高于单项检测(P<0.05)。结论CEA、NSE、CYFRA21-1、SCC-Ag4项肿瘤标志物对肺癌的诊断具有较大的辅助诊断价值,联合检测可提高检出率。
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.