简介:与超声的助理混合方法,polyol/organo的设置的混合物反应montmorillonite(ORMMT)是pretreated。prepolymer填写了MMT泥土被polyol/ORMMT混合的反应与甲苯diisocyanate(TDI)准备。结果的prepolymer与扩展程序(DMTDA)然后polyurethane-urea/organo反应了反应montmorillonite(PUU/ORMMT)nanocomposites被获得。PUU/ORMMTnanocomposites的结构,形态学和性质被英尺红外,TEM,AFM,紧张压力机器,TGA,和动态机械分析(直接存储器存取)描绘。结果证明当OMMT内容是3%时,PUU/ORMMTnanocomposities执行了超级机械性质。因为ORMMT的存在,两T<潜水艇class=“a-plus-plus”>软片断的g并且黝黑增加的PUU,和为第一步和第二步的分解温度分别地增加了。TEM图象证明在PUU合成展览的organophilicMMT粒子置闰和脱落的高度。
简介:C2C的模式在中国完成了培养用户网络购物习惯的使命,而最终要盈利却不得不绕道B2C。4月17日,易趣网副总裁常琳的晚餐时间是和易趣新平台上的个人大卖家们一起度过的。席间,那些自eBay易趣时代就栖身此处的大卖家们不断地向常琳提出各种吸引卖家进驻的建议。
简介:Neglectingtheconsumptionofthematerial,asteadyincompressibleflowofanexothermicreactingthird-gradefluidwithviscousheatinginacircularcylindricalpipeisnumericallystudiedforbothcasesofconstantviscosityandReynolds’viscositymodel.Thecoupledordinarydifferentialequationsgoverningtheflowincylindricalcoordinates,aretransformedintodimensionlessformsusingappropriatetransformations,andthensolvednumerically.SolutionsusingMaplearepresentedintabularformandgivenintermsofdimensionlesscentralfluidvelocityandtemperature,skinfrictionandheattransferrateforthreeparametricvaluesintheReynolds’case.Thenumericalresultsforthevelocityandtemperaturefieldsarealsopresentedthroughgraphs.Bifurcationsarediscussedusingshootingmethod.Comparisonsarealsomadebetweenthepresentresultsandthoseofpreviouswork,andthusverifythevalidityoftheprovidednumericalsolutions.Importantpropertiesofthermalcriticalityareprovidedforvariableviscosityparameterandreactionorder.Furthernumericalresultsarepresentedintheformoftablesandgraphsfortransitionofphysicalparameters,whilevaryingcertainflowandfluidmaterialparameters.Also,theflowbehaviourofthereactivefluidofthird-gradeiscomparedwiththoseoftheNewtonianreactivefluid.
简介:TiC/Cr18Ni8steelbondedcarbidesweresynthesizedbyvacuumsinteringwithmixedpowdersofiron,ferrotitanium,ferrochromium,colloidalgraphiteandnickelasrawmaterials.Themicrostructureandmicrohardnessofthesteelbondedcarbideswereanalyzedbyscanningelectronmicroscope(SEM),X-raydiffraction(XRD)andRockwellhardometer.ResultsshowthatthephasesofsteelbondedcarbidesmainlyconsistofTiCandFe-Cr-Nisolidsolution.ThesynthesizedTiCparticlesarefine.Mostofthemarenotmorethan1μm.Withtheincreaseofsinteringtemperature,theporosityofTiC/Cr18Ni8steelbondedcarbidesdecreasesandthedensityandhardnessincrease,butthesizeofTiCparticlesslightlyincreases.Underthesamesinteringconditions,thedensityandhardnessofsteelbondedcarbideswithC/Tiatomicratio0.9arehigherthanthosewithC/Tiatomicratio1.0.TheTiCparticleswithC/Tiatomicratio0.9aremuchfinerandmorehomogeneous.
简介:ThepatternofITOtransparentelectrodeofpixelcellsinTFTAMLCDisacriticalstepinthemanufacturingprocessofflatpaneldisplaydevices,thedevelopmentofsuitableplasmareactiveionetchingisnecessarytoachievehighresolutiondisplay.InthisworkweinvestigatedtheAr/CF4plasmaetchingofITOasfunctionofdifferentparameters.WedemonstratedtheabilityofthisplasmatoetchITOandachievedanetchingrateofabout3.73nm/min,whichisexpectedtoincreaseforlongpumpingdownperiod,andalsothroughadditionofhydrogenintheplasma.FurthermorewedescribedtheITOetchingmechanisminAr/CF4plasma.Theinvestigationofselectivityshowedtobeverylowoversiliconnitrideandsilicondioxidebutveryhighoveraluminum.
简介:Objective:Thispaperaimsatmeasurementenhancedeffectofoxidizedlipoprotien(a)[oxLp(a)]onpermeabilityofmonolayerendothelialcellsandrelationshipwithreactiveoxygenspecies(ROS)generationanddesmogleins(DSGs)expression.MethodsandResults:Transendothelialpermeabilitywasassayedbytranswellandreactiveoxygenspecies(ROS)wasdeterminedbyDCFH-DAstaining.RT-PCRwascarriedouttodetermineDSGlandDSC2expressioninmRNA,respectively.TransendothelialpermeabilitywasenhancedbyoxLP(a)doseandtimedependently.Themostmarkedeffectappearedataconcentrationof100mg/L,Transendothelialpermeabilityreachedthemaximumvalueafter2hofFITC-dextranaddition,andthengraduallydecreasedafter4h.oxLp(a)inducesthegenerationofcellularreactiveoxygenspecies(ROS),andthiseffectcouldbeinhibitedbysuperoxidedismutase(SOD).IncubationofHUVECswithoxLp(a)resultedinadoseandtime-dependentdown-regulationofDSGlandDSC2expressionattranscriptionallevel.Conclusion:PermeabilityofmonolayerendothelialcellswasenhancedbyoxLp(a)whichisrelatedtoup-regulatingROSformationanddown-regulatingdesmogleinsexpression.
简介:Inthisstudy,weinvestigatedtheeffectsof6-benzylaminopurine(6-BA)–calciumchloride(CaCl2)–salicylicacid(SA)treatmentontheyellowingandreactiveoxygenmetabolismofharvestedbroccoliheads.Wedippedfreshbroccoliheadsinacompoundsolution(0.6mmol/L6-BA+40mmol/LCaCl2+3mmol/LSA)for5minandthenstoredthemat23°Cfor4days.Theresultsshowedthatthe6-BA–CaCl2–SApostharvesttreatmenteffectivelyretardedtheincreaseincolorvalues(e.g.,variationsfromblacktowhite,fromgreentored,andfrombluetoyellow)andthedeclineinchlorophyllcontentofthebroccoliheads.Comparedwiththecontrolbroccoli,therateofsuperoxideanionradical(O2·?)productionandthehydrogenperoxide(H2O2)contentwereloweredbythetreatment.Wealsofoundsignificantdifferencesintheactivitiesofsuperoxidedismutase(SOD),catalase(CAT)andperoxidase(POD)inthetreatedbroccoli.Basedontheseresults,weconsider6-BA–CaCl2–SAtoinhibittheaccumulationofreactiveoxygen,delaythedegradationofchlorophyll,andprolongtheshelflifeofbroccoliheadsat23°C.
简介:题目:活性瓷釉涂层钢筋混凝土防护墙抗爆性能研究目的:活性瓷釉涂层能够显著增强钢筋的防腐蚀能力,同时能够明显提升钢筋与混凝土的粘结力。通过对活性瓷釉涂层钢筋混凝土防护墙在冲击荷载作用下的破坏特征进行试验和数值模拟,为活性瓷釉涂层技术在钢筋混凝土结构中的应用提供理论基础。创新点:1.对活性瓷釉涂层钢筋混凝土防护墙进行爆炸荷载作用下的破坏试验;2.通过数值模拟,探究活性瓷釉钢纤维对钢筋混凝土结构抗爆能力的影响,为结构设计提出建议。方法1.通过对活性瓷釉涂层钢筋防护墙进行爆炸试验(图2),揭示活性瓷釉涂层钢筋混凝土结构的动力破坏特征(图4和5);2.通过数值方法研究活性瓷釉涂层对钢筋混凝土防护墙抗爆性能的影响,揭示在不同钢筋.混凝土粘结强度时钢筋混凝土结构整体性的变化规律(图10、13和15);3.在爆炸试验和数值分析基础上,提出活性瓷釉涂层钢筋混凝土结构抗爆设计建议(图16)。结论:1.活性瓷釉涂层能够显著改善钢筋在混凝土结构中的传力性能:在爆炸荷载作用下,涂层钢筋混凝土结构的破坏程度明显减轻。2.活性瓷釉涂层能够显著改善钢筋混凝土结构的变形特性,并显著增强其耗能能力。3.在采用活性瓷釉涂层进行抗爆设计时,采用直径较小的钢筋可提高结构的吸能能力。