简介:Thispaperpresentsatheoreticalmodelonthenormal(head-on)collisionbetweensoft-spheresonthebasisofelasticloadingoftheHertzcontactforcompressionprocessandanonlinearplasticunloadingforrestitutionone,inwhichtheparametersallaredeterminedintermsofthematerialandgeometriconesofthespheres,andthebehaviorsofperfectelastic,inelastic,andperfectplasticcollisionsappearedintheclassicalmechanicsarefullydescribedonceavalueofcoefficientofrestitutionisspeci...
简介:Asglobaltemperaturesincreaseanddissolvedoxygen(DO)contentdecreasesinmarinesystems,indicesassessingsedimentDOcontentinbenthichabitatsarebecomingincreasinglyuseful.Onesuchmeasureisthedepthtotheapparentredoxpotentialdiscontinuity(aRPD),atransitionofsedimentcolorthatservesasarelativemeasureofsedimentDOcontent.WeexaminedspatiotemporalvariationofaRPDdepth,andthenatureoftherelationshipsbetweenaRPDdepthandbiotic(infaunaandepibenthicpredators)andabioticvariables(sedimentproperties),aswellastheavailabilityofresources(chlorophyllaconcentration,andorganicmattercontent)intheintertidalmudflatsoftheBayofFundy,Canada.aRPDdepthvariedsignificantlythroughspaceandtime,andacombinationofbiotic(sessileanderrantinfauna,aswellasepibenthicpredators),andabiotic(exposuretimeofaplot,sedimentparticlesize,penetrability,andwatercontent)variables,aswellastheavailabilityofresources(sedimentorganicmattercontent,andchlorophyllaconcentration)werecorrelatedwithaRPDdepth.Assuch,knowledgeofbothbioticandabioticvariablesarerequiredforaholisticunderstandingofsedimentDOconditions.AbioticvariableslikelydictateasuiteofpotentialaRPDdepthconditions,whilebiotaandresourceavailability,viabioturbationandrespiration,stronglyinfluencetheobservedaRPDdepth.AsDOconditionsinmarinesystemswillcontinuetochangeduetoglobalclimatechange,elucidatingtheserelationshipsareakeyfirststepinpredictingtheinfluencedecreasingDOcontentmayhaveuponmarinebenthos.&2017InternationalResearchandTrainingCentreonErosionandSedimentation/theWorldAssociationforSedimentationandErosionResearch.PublishedbyElsevierB.V.Allrightsreserved.
简介:Takingα-FeandNd2Fe14Bgrainsasexample,thegrainsizedependenceoftheexchange-couplinginteractionandeffectiveanisotropyandalsotheirvariationsdependingontheratioofmagneticallysoftandhardgrainsizes,Ds∶Dh,wereinvestigated.WhengrainsizeD>Lex,thegrain'sanisotropyisthestatisticvalueofthecoupledanduncoupledpart.TheanisotropyconstantofuncoupledpartisthecommonvalueK1andthatofcoupledpartvarieswiththedistancetothegrainsurface.Theeffectiveanisotropyconstantbetweenmagneticallysoftandhardgrains,Keff,canbeexpressedasthesumoftheproductsofvolumefractionsforsoftandhardgrains,respectively,andthecorrespondingmeananisotropyconstants.Thecalculationresultsindicatethattheexchange-couplinginteractionisenhancedwiththereductionofgrainsize,andtheeffectiveanisotropydecreaseswithreducinggrainsizeandincreasingratioofDs∶Dh.Inordertogethigheffectiveanisotropyconstant,Keff,incompositemagneticallysoft-hardgrains,thehardgrainsizeshouldbelargerthan30nmandthesoftgrainsizeshouldbeabout10nm.
简介:Identity-basedhashproofsystemisabasicandimportantprimitive.Ittographicschemesandprotocolsthataresecureagainstkey-leakageattacks.Inthisupdatableidentity-basedhashproofsystem,inwhichtherelatedmastersecretkeyiswidelyutilizedtoconstructcryp-paper,weintroducetheconceptofandtheidentitysecretkeycanbeupdatedsecurely.Then,weinstantiatethisprimitivebasedonlatticesinthestandardmodel.Moreover,weintroduceanapplicationofthisnewprimitivebygivingagenericconstructionofleakage-resilientpublic-keyencryptionschemeswithanonymity.Thisconstructioncanbeconsideredastheintegrationofthebounded-retrievalmodelandthecontinualleakagemodel.Comparedwiththeexistingleakage-resilientschemes,ourconstructionnotonlyismoreefficientbutalsocanresistmuchmorekeyleakage.
简介:这篇论文论述一个多模式控制计划为一软开关回扫在全部负担上完成高效率和优秀负担规定的变换器变化。在重负担,有山谷切换的批评传导模式(CCMVS)被采用认识到以便象进行的电磁的干扰(EMI)一样减少刺激电源损耗开关的软切换。在轻负担,变换器与山谷切换和适应离开时间控制(AOT)限制切换的频率值域,频数值域和maintain负担规定在不连续的传导模式(DCM)操作。在极其轻的负担或在待机模式,爆炸模式操作被采用通过减少两个都切换的频率和控制器的静态的力量驱散提供低动力消耗量。多模式控制被其脉搏持续时间被产量反馈调整的一个振荡器实现。切换的控制电路保证力量的最小的刺激电压落下得到的一条精确山谷切换。控制器IC的原型在一个1.5-μmBiCMOS过程被制作并且适用于310V/20V,90W回扫DC/DC变换器电路。试验性的结果证明所有期望的功能成功地被认识到。flyback变换器完成了从完整的负担的超过80%的效率击倒到2.5W的高度,与到达88.8%的最大值,当在待机模式的总功率消费是大约300mW时。
简介:摘要目的观察soft-start光聚合技术在全瓷修复体粘接中的应用效果。方法取2015年4月—2016年12月医院收治正畸治疗需要拔出第一前磨牙采用光固化复合树脂填充治疗患者60例,随机数字法分为对照组(n=30)和观察组(n=30)。对照组采用高强度光聚合模式治疗,观察组采用soft-start光聚合技术治疗,比较两组临床疗效。结果观察组治疗后28例治疗成功,成功率为93.33%,对照组治疗后22例成功,成功率为73.33%,两组疗效率比较差异有统计学意义(P<0.05);对两组进行6个月随访,两组均未发生并发症(P>0.05)。结论正畸治疗需要拔出第一前磨牙采用光固化复合树脂填充治疗患者全瓷修复体粘接中采用soft-start光聚合技术治疗效果理想,值得推广应用。
简介:FenanowirearraywithstrongshapeanisotropywasemployedasthesoftphaseinNd-Fe-Bbasednanocomposites.TheeffectsoftheFenanowiredistributiononmagneticpropertiesofthenanocompositeswereinvestigatedbymicromagneticsimulation.TheresultsindicatethattheshapeanisotropyofFewiresaddedinthesamedirectionastheuniaxialmagnetocrystallineanisotropyofthehardphasecannotincreasethecoercivityofthenanocomposite.Whenthenanowiresaredistributedperpendiculartotheeasyaxisofthehardphase,theshapeanisotropyofsoftphasecanretardthemomentsfromrotatingtothefullreverseddirection,leadingtoenhancedcoercivity.Inaddition,withincreasingthenanowirediameter,thecoercivityofthenanocompositedecreases,butthedipolarinteractionshowsdifferentrolesinmagneticreversalofnanocompositefordifferentdistributionsofnanowires.ThecurrentresultssuggestthatthecoercivityoftheNd2Fe14B/α-Fenanocompositecanbeenhancedbyintroducingthesoftmagneticnanowirearraywiththediameterlessthantheexchangelengthandwiththelongaxisalongthedirectionotherthantheeasyaxisofhardphase.
简介:软事被观察异常粘性行为经常在声学的波浪繁殖由幂定律频率依赖者变细描绘了。最近的十年在为如此的异常粘性行为,礼品,作者们经由积极部分衍生物在哪个之中建议了修改Szabo的波浪方程开发各种各样的模型上见证快成长研究。学习是使用修改Szabo的波浪方程模仿一种最近的超声的成像技术的这的目的把临床的amplitudevelocity重建称为具有典型软织物事的胸肿瘤的成像(CARI)。调查在超声的医药成像的质量上在尺寸的效果和肿瘤的位置上被做了。它从数字结果被观察沿着思考的线的健全压力,它显示察觉结果,与尺寸和肿瘤的侧面的位置显然变化,但是几乎仍然是为不同轴的位置的一样。
简介:摘要:本文由软土地区地铁隧道侧深基坑施工过程相关工况着手,依托隧道段的长期监测数据,对比分析深基坑施工过程中对相邻隧道的变形影响因素分析,以降低深基坑对既有隧道的影响