简介:在这份报纸,包含四羧化物的anionic表面活化剂的一种新类型被四步的合成反应包括bromination反应和主要酰胺综合保护的反应。中介和在整个合成过程的每步的最后的产品被1HNMR和MS描绘。anionic表面活化剂的纯化通过再结晶和硅石胶化列层析的联合被完成。结构和在不同温度的这表面活化剂的批评micelle集中(CMC)也被调查。对容易的不同传统的monocarboxylate表面活化剂形成薄片状的mesostructure,这表面活化剂有六角形的mesophase结构和比较地低的CMC,希望在mesoporous金属氧化物的准备被使用。
简介:StructurehealthmonitoringbasedondiagnosticLambwaveshasbeenfoundtobeoneofthemostpromisingtechniquesrecently.Thispaperhasabriefreviewofthenewdevelopmentsonthismethodincludingthebasicnovelofthemethod,fundamentalsandmathematicsofLambwavepropagation,narrowbandandwidebandLambwaveexcitationmethods,optimizationofexcitationfactorsanddiagnosticLambwaveinterpretationmethods.
简介:ANewmethod,namedatmosphericpressureplasmapolishing,fortheultra-smoothmachiningofthesiliconbasedmaterialsisintroduced.ByinputtingtheCF4gasintotheatmosphericpressureplasmaflame,highdensityreactiveradicalswillbegenerated,whichwillthenreactwiththesiliconbasedmaterials.ThereactionproductisthevaporizationoftheSiF4,whichcanbeeasilyprocessed.Inthisway,theatomicscalematerialremovalcanberealizedandthedefectfreeultra-smoothsurfacecanbeobtained.Anexperimentalsetupisbuiltup,andtheSiCpolishingexperimentiscarriedout.TheAFMtestresultshowsthatthefinishedsurfaceroughness(Ra)canbeimprovedfrom4.529nmto0.926nmin3minutes.
简介:Anewconceptfordevelopmentofmetallicbiomaterialsisproposedinthisarticle,i.e.,acertainbio-functioncanberealizedforametalimplantthroughcontinuousreleaseofadesignedbio-functionalmetalelementfromsurfaceofthemetalimplantinthebodyenvironment.ThiscreativeideahasbeenverifiedtobepossiblebyseveraldifferentinvitroandinvivoexperimentalevidencesontheCu-bearingstainlesssteelsandmagnesiumbasedmetals.ItwasindicatedthatatraceamountofCureleasefromtheCu-bearingsteelscouldhaveobviousbio-functionsofreductionofthein-stentrestenosis(ISR),anti-bacterialinfection,inhibitingtheinflammatorycellsandevenpromotingtheearlyosteogenesis.Furthermore,thedegradationofmagnesiumbasedmetalsinbonescouldpromotethenewboneformation,enhancethebonemineraldensityfortheosteoporosismodeledanimal,andevenhavestronganti-bacterialabilityandstrongcytotoxicitytobonetumorcellsduetotheenhancementofpH.Specialbio-functionwithsatisfiedload-bearingcapacityformetallicbiomaterialswillbringhigherapplicationvaluesfortheimplantmadeofthisnovelmaterial.Thisisanattractivedirectionforresearchanddevelopmentwithmanychallenges,butthefinalsuccesswillbemuchbeneficialtothemajorityofpatients.
简介:由使用焊接电线的镍,焊接弧的以铁酸盐为主要成的可锻的铁的部分熔化地区(PFZ)和焊接金属的机械性质的寒心的趋势上的alloying的效果系统地被学习了。在这个基础上,为以铁酸盐为主要成的可锻的铁(QT400-17)的弧焊的一个新镍电极第一次被开发。它的焊接金属的机械性质能以铁酸盐为主要成的可锻的铁匹配那些。在PFZ的碳化物层(WCL)的宽度显著地被减少,焊接关节有优秀马赫无能,焊接金属有高热的抗碎裂性。(编辑作者摘要)3个裁判员。
简介:在在参考书在中等Mn钢上总结相关研究以后,张力的性质上的二个新目标被定义。一个人两个都是那导致转变(旅行)并且导致双胞胎的粘性(缇)能与一个相对低的Mn内容为钢被认识到,它与更高的Mn内容展出类似的张力的性质到古典缇钢。其它将完成超离频的最终的张力的力量(>1.5?GPa)没有牺牲formability。达到这些目标,新设计策略为作文和处理线路被提出。特别地,因为前者能经由部分再结晶与不同形态学和尺寸生产保留的奥氏体谷物的混合物,温暖的滚动被采用而不是平常的热/冷的滚动过程。因而,保留的奥氏体谷物有大量技工稳定性以便他们能在变丑期间逐渐地转变到马氏体,导致提高的旅行效果然后改进技工性质。最后,它在在实验室生产这些指向的中等Mn钢被接替,他们中的一些甚至比我们的期望展出更好张力的性质。
简介:大多数商品化的冠的stents用316L做的由于它性质的好联合,并且当前,某新stents用由于它的更高机械的性质的基于钴的合金做的不锈钢。然而,在这些材料的镍或钴元素的高数量的存在,被知道触发有毒、过敏的回答,引起了许多担心。没有镍的奥氏体的不锈钢被开发了以便解决这些问题。在这份报纸,基于新Fe-Cr-Mn-Mo-N的开发打高氮没有镍的奥氏体的不锈钢,性质象机械性质那样,在汉克的解决方案,并且在包括运动clotting时间和血小板粘附的vitro血相容性的腐蚀电阻,与上述二常规材料,316L不锈钢和Co-28Cr-6Mo合金相比被调查。结果证明新高氮钢钢和Co-28Cr-6Mo合金,和罐头是的316L比那些拥有了机械性质,腐蚀抵抗和血相容性的更好的联合为冠的stents的制造的有希望的其他的材料。
简介:AnewcompoundK6Ti0.67Nb15.33O42waspreparedforthefirsttimebysolidstatereactioninK2O-Ni2O3-Nb2O5ternarysystem.Thenewcompoundwascharacterizedbyelectronprobe,X-raypowderdiffractionandDTA.TheresultofX-raypowderdiffractionshowsthatK6Ti0.67Nb15.33O42crystallizesthehexagonalsystemwithunitcellparametersa=9.1341(5)A,c=12.090(1)A.andspacegroupP62/mcm(193).
简介:Thepurposeofthisstudywastouseathree-componentphotoinitiationsystemcomprising1wt%CQ(camphorquinone),2wt%DMAEMA(2-(dimethylamino)ethylmethacrylate)and2wt%Ph2I+PF6-(diphenyliodoniumhexafluorophosphate)toinitiatethecopolymerizationofthematrixresinswhichcombinebisphenol-S-bis(3-methacrylate-2-hydroxypropyl)ether(BisS-GMA)withtheexpandingmonomerunsaturatedspiroorthoesters2-methylene-1,4,6-trispiro[4,4]nonane(MTOSN),forminimizingthevolumetricshrinkagethatgenerallyoccursduringpolymerization.ItwashypothesizedthatMTOSNwouldexpandvolumetricallyduringpolymerizationunderthethree-componentphotoinitiatorsystemandfurtherreductionsinvolumetricshrinkagewouldbeobtained.Theperformancestudywhichconsistsofdegreeofconversionandconditionofthering-openingreactionsofMTOSN,volumetricshrinkageandmechanicalpropertiesincludingtensilebondstrength,compressivestrengthandVicker'shardnesswerecarriedoutrespectivelybyFouriertransferinfrared,thedilatometerandtheuniversaltestingmachine.Theresultssupportedthatthedentalcompositesbasedontheexpandingmonomerandthree-componentphotoinitiatorsystemengenderedagreaterdecreaseofvolumetricshrinkageandbettermechanicalproperties.
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简介:一个双网络模型被建立,它由片断,E和A成分链组成,与另一个纠缠由的聚合的链多--纠纷和聚合的链由多吸附与很多右破坏的粒子连接了,基于哪个E和A成分链能动态地被再创造并且释放。端对端的向量的分发功能,为在多纠纷和多吸附状态和他们聚合的链的数字的二种链的符合构造的统计分发功能被统计力学和动力学的联合计算。然后,为二种网络和暂停的变丑的粘弹性的免费精力被Boltzmann的统计理论计算。另外,为二种网络和暂停的有弹性的模量和存储器功能被导出。因而,为聚合暂停的非线性的粘弹性的一个新分子的理论被建议,并且有在不同流动地里为聚合暂停让步并且变瘦的组成的方程和材料功能从理论被导出。(编辑作者摘要)15个裁判员。
简介:Aneffectivedispersion-strengtheningphaseinAl-8Fe-2Mo-2Zr-2Nd-0.7Ti-1.6SialloywasidentifiedtobeanagedprecipitatephasewithpossiblechemicalstoichiometryofAl20(Ti,Mo)2Ndandfcccrystalstructurewithao=1.455nm.ThestructurewasdeterminedtobeFm3mspacegroup.