简介:PhasesandmicrostructuresofthreehighZncontainingAl–Zn–Mg–Cualloyswereinvestigatedbymeansofthermodynamiccalculationmethod,opticamicroscopy(OM),scanningelectronmicroscopy(SEM)energydispersivespectroscopy(EDS),X-raydiffraction(XRD),anddifferentialscanningcalorimetry(DSC)analysis.TheresultsindicatethatsimilardendriticnetworkmorphologiesarefoundinthesethreeAl–Zn–Mg–Cualloys.Theas-cast7056aluminumalloyconsistsofaluminumsolidsolution,coarseAl/Mg(Cu,Zn,Al)2eutecticphases,andfineintermetalliccompoundsg(MgZn2).Bothofas-cast7095and7136aluminumalloysinvolvea(Al)eutecticAl/Mg(Cu,Zn,Al)2,intermetallicg(MgZn2),andh(Al2Cu).Duringhomogenizationat450°C,fineg(MgZn2)candissolveintomatrixabsolutely.Afterhomogenizationat450°Cfor24h,Mg(Cu,Zn,Al)2phasein7136alloytransformsintoS(Al2CuMg)whilenochangeisfoundin7056and7095alloys.ThethermodynamiccalculationcanbeusedtopredictthephasesinhighZncontainingAl–Zn–Mg–Cualloys.
简介:Inapreviousgreenhouseexperiment,weshowedthattherewasaninteractionbetweencuandZn,whichaffectedgrowthandmetaluptakebyyoungbarleyplantsgrownonsoiltowhichCd,Cu,Pb,andZnhadbeenadded.Wesuggestedthattheunderlyingmechanismwasthecontroloftheamountofplant-availableZnbycompetitiveadsorptionbetweenCuandZn,Inordertotestthishypothesis,theadsorptionofZnalone,andinthepresenceofaddedCd,CuandPb,hasbeenmeasuredusingthesamesoil.Followingadsorption,theextractabilityoftheZninCaCl2solutionwasmeasured.TheadsorptionisothermsshowedthatoftheaddedmetalsonlyCuhadalargeeffectonZnadsorption.TheeffectofCuwastoreduceZnadsoptionandtoincreasetheamountofCaCl2-extractable(i.e.plant-available)Zn,inagreementwiththeconclusionsfromthegreenhouseexperiment.ThemagnitudeoftheeffectofCuonplant-avalilableZnwassimilarinbothexperiments.
简介:Theself-diffusionofREisotopesinporouscationexchangerswithvariousparticlesizeandinseveralMR-typeresinsnEDTAsolutionsofrareearthswasstudied.TheintraparticleeffectivediffusivitiesDeofCe,TbandYbweremeasuredbyisotopicionexchange,DewasaffectedbytheconcentrationofthebulksolutionandwasseparatedintoasolidphasediffusivityDgandamacroporediffusivityDpusingKataoka′sdidisperseporemodel.Itshowsthatthemodelcanbeappliedtoexpressthekineticprocess;DemuchlargerthanDeandDgisnearlyequaltoDe.Solidphaseresistanceisamajorcomponentofresistancetotheexchangeforporousresins.
简介:StudyontheavoidanceresponseofPenaeuschinensistoheavymetals(Pb,Cr,Zn)andheavymetalmixtures(Pb-Cr,Pb-Zn)iscarredoutusingaY-modelavoidanceapparatus.Theconcentrationscalculatedtoinduce50%avoidanceratebyPenaeuschinensisare11.4,33.2and238.1mg/LforPb,CrandZn,respectively.MixturesofPb-CrandPb-ZnproduceadditiveeffectintheavoidancetestusingPenaeuschinesis.ButwhenthemixedPb-Znsolutionhas0.5toxicunitPband0.5toxicunitZn,themixtureseemstohavesynergisticeffect.
简介:喷洒的Zn和Zn15Al涂层被选择保护对的高张力水泥(PHC)的结束输送的金属的弧在东北中国在北瓷器和中立草地土壤对盐咸滩土壤的腐蚀堆。在二个模仿的土壤答案的涂的Q235钢样品的腐蚀行为被potentiodynamic极化和电气化学的阻抗光谱学(EIS)调查方法。试验性的结果证明在两个都模仿的答案的矩阵Q235钢的腐蚀被Zn和Zn15Al涂层显著地禁止。Zn和Zn15Al上的腐蚀产品厚、紧缩、坚挺、保护。Zn和Zn15Al涂的样品的腐蚀水流密度icorr与腐蚀时间,和费用转移电阻Rct显然被减少极大地被增加。在模仿的中立草地土壤答案的Zn和Zn15Al的腐蚀电阻索引是比在盐咸滩土壤的那些更突出的。在盐咸滩土壤的Zn15Al的腐蚀电阻比Zn的稍微优异。当喷洒的涂层与环氧基树脂树脂被封上时,涂层的腐蚀电阻进一步显著地被提高。
简介:本文研究了清洗液中联氨浓度,清洗温度,钝化液pH对低温EDTA化学清洗基建锅炉效果的影响。结果表明联氨浓度为2000ppm,清洗温度为90℃,清洗效果最好;碱性钝化时pH为9.0左右时钝化效果最佳。
简介:摘要目的研究分析EDTA在牙体治疗中的应用效果。方法选择在2012年3月至2014年3月入住我院接受治疗的60例牙体疾病患者作为研究对象。将其临床资料进行回顾性分析,应用乙二胺四乙酸(EDTA),予以牙体疾病患者针对性治疗与护理,结合统计学相关理论,评价EDTA在牙体治疗中的应用价值。结果通过一段时间的精心治疗与护理后,60例患者中10例龋病,4例(40.00%)治愈,6例(60.00%)有效,总有效率为100.00%;26例牙髓病,14例(53.85%)治愈,10例(38.46%)有效,2例(7.69%)无效,总有效率为92.31%;24例根尖周病,8例(33.33%)治愈,12例(50.00%)有效,4例(16.67%)无效,总有效率为83.33%。结论EDTA在牙体治疗中具有重要的应用价值,值得临床大力推广与应用。
简介:摘要目的探讨临床检验工作中EDTA导致血小板假性减少(PTCP)现象的存在,用正确的方法复查,避免误诊的发生。方法用SysmexXE-2100型全自动血液分析仪,EDTA抗凝血检测计数血小板,结果异常偏低,再用枸橼酸钠抗凝血检测计数血小板,并作末梢血,EDTA及枸橼酸钠抗凝血涂片染色进行显微镜镜检。结果EDTA抗凝血用XE-2100型全自动血液分析仪检测计数血小板异常偏低,而枸橼酸钠抗凝血检测计数血小板正常,EDTA抗凝血涂片显微镜镜检可见血小板凝聚,末梢血,及枸橼酸钠抗凝血涂片染色显微镜镜检血小板正常。结论对于EDTA抗凝血检测计数血小板异常偏低的标本,怀疑EDTA抗凝剂所致的血小板聚集现象所致的血小板假性减低可能时,应加做枸橼酸钠抗凝血检测计数血小板,并作末梢血,EDTA及枸橼酸钠抗凝血涂片染色进行显微镜镜检,以验证PTCP的存在,避免误差的发生。