简介:MoleculardynamicssimulationusingauniversalforcefieldhasbeenemployedtodeterminethediffusioncoefficientsofO2andNa2SO4vaporintoB2O3andSiCfrom700Kto1273K,respectively.Einsteindiffusionwasobservedina250~300pssimulation.ThediffusioncoefficientfortheO2rangefromabout9.279×10-9cm2/sforB2O3to2.275×10-10cm2/sforSiCataloadingof32moleculespersimulationbox,thatfortheNa2SO4vaporrangefromabout9.888×10-7cm2/sforB2O3to1.837×10-10cm2/sforSiCataloadingof8moleculespersimulationbox.EnvironmentpropertiesofC/SiCcompositewillbeincreasedviatheB2O3preventingthediffusionofO2andNa2SO4vaporintothepyrolyticinterphaseandcarbonfibers.
简介:摘要 对八钢2500m3高炉开炉的主要操作经验进行了总结,八钢2500m3高炉采用了串罐物料钟炉顶, 联合软水密闭循环冷却,在铁口、炉腹、炉腰及炉身下部采用铜冷却壁,陶瓷杯加水冷炭砖薄炉 底炉缸结构,INBA炉渣处理系统、3座旋切顶燃式热风炉、煤气干法布袋除尘等多项技术。通过开炉前的精心准备,制定合理的开炉方案,选择合适的送风参数,通过合理控制煤气流的分布,顺利实现了炉况快速恢复的目标。
简介:本文全面地提出了检修UJ7/b型携带式电势差计的方法。
简介:Themonomericcobalt-phosphite-thiolatocomplex[Co(mpt)2{P(OCH3)3}2]BF4(Hmpt=2-mercaptothiazoline)hasbeenpreparedandcharacterizedbyX-raycrystallography.ThecomplexcrystallizesinthemonoclinicspacegroupC2/cwitha=0.8078(5),b=2.6020(18),c=1.2191(7)nm,β=99.38(1)°,V=2.528(3)nm3,andZ=4.Thestructurecomprisesdiscretecations[Co(mpt)2{P(OCH3)3}2.]+andanionsBF4-,inwhichthecobalt(Ⅲ)atomiscoordinatedtotwochelatempt-andtwoas-orientedmonodentateP(OCH3)3ligandsinahighlydistortedoctahedralgeometry.ThemostdistortedanglesareS(2)-Co(1)-S(2a)of162.23(10)°andN(1)-Co(1)-S(2)of71.47(13)°,thelatteriscausedbythegeometricconstraintofthebidentateligandmpt-.CyclicvoltammetryhasbeenusedtostudytheelectrochemicalbehaviorofthetitlecomplexontheRelectrodeinMeCNsolutionwith0.1mol·L-1ofBun4NBF4aselectrolyte.TheresultsindicatethatthetitlecomplexisunstableinMeCN.
简介:A60%Fe/Al2O3catalystwaspreparedbytheco-precipitationmethod.ItwasreducedbyH2toproducemetallicFe,whichwasthensulfidedbyCS2toFe0.96SandFe3S4orphosphidedbytriphenylphosphine(PPh3)inliquidphasestoFe2PandFeP.Itwasfoundthattheironsulfides(Fe0.96SandFe3S4)exhibitedthelowactivityforthehydrodesulfurization(HDS)reactions.TheHDSactivitywasalsolowontheFe(metal)/Al2O3andFe2P/Al2O3catalystssincetheywereconvertedintoFe0.96SandFe3S4duringtheHDSreactions.Incontrast,theFeP/Al2O3wasfoundtobestableandactivefortheHDSreactions.Inparticular,FeP/Al2O3possessedsignificantlysmallerFePparticlesthanFeP/C,leadingtothesignificanthigherHDSactivityofFeP/Al2O3thanFeP/C.
简介:摘要目的检测β-1,3-N-乙酰氨基葡萄糖氨基转移酶3(B3GNT3)在胰腺癌组织中的表达情况,分析其临床意义。方法采用生物信息学的方法分析B3GNT3在胰腺癌组织及癌旁正常组织中的mRNA水平,并分析其表达与胰腺癌患者的生存率间的关系。回顾性分析78例接受手术治疗的胰腺癌患者的临床病理资料。采用免疫组化法检测胰腺癌组织和癌旁正常组织中的B3GNT3蛋白表达水平,分析其与肾透明细胞癌患者临床病理特征的关系。结果生物信息学分析结果显示,B3GNT3的mRNA在胰腺癌组织中显著高表达,并与患者总生存率和无病生存率显著相关。免疫组化结果表明,B3GNT3在胰腺癌组织中的表达明显高于癌旁正常组织。B3GNT3在胰腺癌组织中的高表达与肿瘤分期、肿瘤大小及淋巴结的转移情况相关(均P<0.05),而与年龄、性别、肿瘤分级无关(均P>0.05)。结论B3GNT3在胰腺癌的进展演变中发挥重要作用,有望成为胰腺癌重要的治疗靶点和一个潜在的生物标志物。