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简介:Thecarbon-13spin-spinrelaxationtimesoffluorine-containingionomersaremeasuredandmotionalcorrelationtimesτ_oandτ_darecalculatedbyusingVJGMmodel.Theresultsshowthatthemotionsofpolymermainchaininionomersbecomemoredifficultwithincreasingofionizationdegreeandcontentsoffunctionalgroup,anddependonthefinestructuresandstabilityofionicmicrodomains.
简介:当前的实践使用预兆的模型外推长时期的反应系列基于在中等、弱的地震的远地的记录。然而,系列不足够长,数据经常不是可靠的,它意味着地震设计代码不能精确地为长时期的结构定义地震设计要求。近地的记录罪恶假装聪明的地震主要吃惊有大signal-to-noise比率(SNR),它为学习长时期的加速反应光谱直到20秒使他们合适。来自在原因的差错的120km以内的246个车站的Theacceleration反应系列统计上在这篇论文被分析。long-periodresponse光谱上的距离和地点条件的影响被讨论,并且扩大系列的形状与在中国的地震设计代码指定的标准系列相比。最后,为到代码的未来修订的建议被建议。
简介:Amain-chainliquidcrystallineionomer(MLCI)containingsulfonicgroupwassynthesizedbyaninterfacialcondensationreaction.TheMLCIwasblendedwithpolybutyleneterephthalate(PBT)andpolypropylene(PP).MLCIinteractedwithboththedispersed(PP)phaseandthematrix(PBT)phasetomodifytheinterfacialinteractionofPBTandPP.Differentialscanningcalorimetry(DSC),scanningelectronmicroscopy(SEM)andFTIRimagingsystemanalysisdemonstratedthesignificanceofinterfacialinteractioninthepolymerblends.MLCIbroughtaboutgoodadhesionattheinterfacial,whichreducedthedispersephasesizeandenabledafinePPphaseatmatrix.ThemechanicalpropertiesoftheternaryblendswereimprovedwhenaproperamountofMLCIwasadded.Thiswasattributedtoenhancedadhesionattheinterface,whichinvokedbettermechanicalpropertiesintheblends.
简介:以便综合新聚酰胺(PA)5并且copolyamides(CoPA)7a-7d,一包含triazine的二羟基的酸新型戒指成功地从2,4-dichloro-6-methoxy-s-triazine被综合1并且4-aminobenzoic酸。新聚酰胺5包含triazine一半从4,4-(6-methoxy-1,3,5-triazine-2,4-diyl)被准备二度(azanediyl)dibenzoic酸3并且由直接polycondensation反应的4,4-diaminodiphenylether。然后新的系列有在普通器官的溶剂的高溶解度的热地稳定的copolyamides7a-7d从作为第一单体的二酸3的直接polycondensation反应被综合,脂肪族芳香的二酸6a-6d作为第二二酸和4,4-diaminodiphenylether。上述所有聚合物充分被描绘由<啜class=“a-plus-plus”>1H-NMR和FTIR光谱学,元素的分析(CHN),固有的粘性,溶解度测试,胶化浸透层析(GPC),微分扫描热量测定(DSC)和thermogravimetric分析(TGA)。结果的CoPAs7a-7d显示出好固有的粘性,溶解度和热性质。
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简介:科学的钻的主要的洞(CCSD-MH)主要是的中国大陆人的岩性学orthogneiss,paragneiss,eclogite,角闪岩,和ultramafic岩石包括了。CCSD-MH的木头的统计结果显示ultramafic岩石被很高的CNL(中子木头)和很低的GR(gamma光线木头)和RD(抵抗力木头)描绘;eclogites被高兽穴(密度)描绘,VP(P波浪速度)和PE(光电的吸收俘获十字节);orthogneiss和paragneiss被高GR,U(铀内容),Th(钍内容),K(钾内容)和RD描绘,并且低兽穴,PE,和CNL;角闪岩的记载的价值在eclogites和paragneiss的记载的价值之间。另外,木头能反映度后退eclogites的变态。上面的节(1002000m)显示出更高的兽穴,PE,VP,和更低的GR,U,Th,K,RD比更低的节(20005000m)。上面的节的大多数木头是比更低的节的那些更变动的。这显示上面的节比更低的节有更多的异质。木头的生气阴谋显示那兽穴,GR,K,和CNL在识别是更强大的超离频压力变形(UHPM)在CCSD-MH摇。从CCSD-MH的岩石的GR价值显然从ultramafic岩石(在CCSD-MH的大多数mafic岩石)显示出一个增加的趋势到orthogneiss(最,酸在CCSD-MH摇)。相反,兽穴价值从ultramafic岩石减少到orthogneiss。CNL木头是在水晶的岩石中的结构水的内容的好指示物。
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简介:Wepresentastudyofthenonlinearcouplinginternalresonancefortheheaverollandpitchperformanceofasparplatformunderthewaveandvortex-inducedloadswhentheratioofthefrequenciesofheave,rollandpitchareapproximately2:1:1.Inconsiderationofvaryingwetsurface,thethreeDOFsnonlinearcoupledequationsareestablishedforthesparplatformundertheeffectofthefirst-orderwaveloadsintheheaveandpitch,andvortexinducedloadsintheroll.Byutilizingthemethodofmulti-scaleswhenthevortex-inducedfrequencyisclosetothenaturalrollfrequency,thefirst-orderperturbationsolutionisobtainedanalyticallyandfurthervalidatedbythenumericalintegration.Sensitivityanalysisisperformedtounderstandtheinfluenceofthedampingandtheinternaldetuningparameter.Twocaseswithinternalresonanceareshown.Thefirstcaseisthatnosaturationphenomenonexistsundersmallvortex-inducedloads.Thefirstorderperturbationsolutionillustratesthatonlythevortex-inducedfrequencymotioninrollandthesuper-harmonicfrequencymotioninheaveareexcited.Thesecondcaseisthatthevortex-inducedloadsarelargeenoughtoexcitethepitchandasaturationphenomenonintheheavemodefollows.Theresultsshowthatthereisnosteadyresponseoccurrenceforsomecases.Forthesecaseschaosoccursandlargeamplitudesresponsecanbeinducedbythevortex-inducedexcitation.
简介:SincethelowandmediumgradeoxideoresintheMainandEasternMiningAreasattheBayanOboMinehaveahighgradeofNb2O5andlargeorereservesandarerichinmanyelements,theyareofgreatervaluetouseindevelopmentandrecoverythanotherkindsofniobiummineralsresources.Thedisseminationcharacteristicsandprocessingpropertiesoffourtypesofniobiummineralsaresummarisedandmethodsandresultsofniobiummineralprocessingarealsodescribed.
简介:1AnimportantsectorinthehydropowerindustrySincethefoundingofthePeople'sRepublicofChinain1949,andparticularlysincethereformandopeningupperiod,ruralhydropowerhaswitnessedswiftdevelopment.Ruralhydropowerexploitationhasbeenincludedintheplansforruralelectrificationdevelopment,andhasbecomeanimportantpartofthewaterresourcessector.AnewSHPindustryhasformed,combiningsocial,economicandenvironmentalbenefits.
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