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简介：Itisnotunusualforthelevelofamonthlyeconomictimeseries,suchasindustrialproduction,retailandwholesalesales,monetaryaggregates,telephonecallsorroadaccidents,tobeinfluencedbycalendareffects.Sucheffectsarisewhenchangesoccurinthelevelofactivityresultingfromdifferencesinthecompositionofcalendarbetweenyears.Thetwomainsourcesofcalendareffectsaretradingdayvariationsandmovingfestivals.Ignoringsuchcalendareffectswillleadtosubstantialdistortionsintheidentificationstageoftimeseriesmodeling.Therefore,itismandatorytointroducecalendareffects,whentheyarepresentinatimeseries,asthecomponentofthemodelwhichonewantstoestimate.

简介：Azathioprine当前是在煽动性的肠疾病的维护治疗的关键药。然而，仍然有要决定的一些实际问题：一个人是我们多长必须维持这药。给疾病是标明日期长期的、非可医好的条件的那煽动性的肠，治疗应该是不定的，仅仅功效的损失或严肃的副作用的外观可以引起退却。关于到功效和他们的维护随着时间的过去，证据从长远的观点看支持这药的连续实用性：事实上，它的退却很实质地增加恶化的风险。关于副作用，azathioprine是一很好相对容忍了药和甚至不定的使用似乎安全。延长使用的主要理论风险将是癌症的骨髓中毒性，hepatotoxicity，和发展。事实上，严肃的骨髓抑制或严肃的肝损坏是不平常的，并且能与这药的合适的使用被最小化。最近的遇见的分析建议淋巴瘤的风险是真实的，但是单个风险是相当低的，并且决定分析从长远的观点看建议有利利益/风险比率。在有azathioprine谁有效、很好容忍的煽动性的肠疾病的病人，因此，这药不应该被停止。这个建议作为单个维护药使azathioprine的使用担心，并且对收到伴随物生物制品疗法的病人未必适用。

简介：Threeyearsago,whenhewastwentyyearsold,Billfinishedmiddleschool.Thenhefoundworkinashop.Usuallyheworksuntilnineo'clockintheevening.Whenhegetshome,healwaysfeelsverytired.

简介：Inthispaper,weproposeasusceptible-infected-susceptible(SIS)modeloncomplexnetworks,small-world(WS)networksandscale-free(SF)networks,tostudytheepidemicspreadingbehaviorwithtimedelaywhichisaddedintotheinfectedphase.Consideringtheuniformdelay,thebasicreproductionnumberR_0onWSnetworksandR_0onSFnetworksareobtainedrespectively.OnWSnetworks,ifR_0≤1,thereisadisease-freeequilibriumanditislocallyasymptoticallystable;ifR_0>1,thereisanepidemicequilibriumanditislocallyasymptoticallystable.OnSFnetworks,ifR_0≤1,thereisadisease-freeequilibrium;ifR_0>1,thereisanepidemicequilibrium.Finally,wecarryoutsimulationstoverifytheconclusionsandanalyzetheeffectofthetimedelayr,theeffectiverateλ,averageconnectivityandtheminimumconnectivitymontheepidemicspreading.

简介：Inordertosolvetheproblemofearlyestimationofmoderatelystrongaftershockdurationtimeinanearthquakesequence,thisstudyhasbeenconducted.First,thedefinitionofthestrongaftershockhasbeengiven.Itispointedoutthatthereisadifferenceinthestrongaftershockdurationtimebetweenthemainshocktypesequenceandthestrongearthquakeswarmsequence.Afterdividingthethreecases,i.e.,astrongaftershockdurationtimelargerthan1day,smallerthan1day,andnostrongaftershockoccurredinamainshocktypesequencebyusingthepatternrecognitionmethod,wegavetheroughcorrelationrelationbetweenstrongaftershockdurationtimeandfirstlargeshockmagnitudefortwotypesofsequences.Finally,thejudgmentindexandmethodofestimatingstrongaftershockdurationtimesfordifferentsequencetypeshavebeengiven.

简介：TheconstructionoftheGeologicTimeScale(GTS)isatitanicscientificchallengethathasbeenunderwayfortwocenturiesandwillrequiremuchdedicatedeffortinthefuture.ItalypreservesaparamountstratigraphicrecordofMesozoicandCenozoicmarinesedimentsthathavebeensignificantinthedevelopmentofthemodernGTS.TheItalianstratigraphicrecordhasbeenhistori-callyimportantinintroducinganddefiningthestandardChronostratigraphicUnits(CUs)oftheNeogeneandQuaternary.PelagicsuccessionsfromNorthernApen-ninesandSouthernAlpshavebeenusedintheseventiesforintegratingthelateCretaceous-PaleogeneGeomag-neticPolarityTimeScale(GPTS)withplanktonicmicrofossilbiostratieraohvandstandardCUs.Thiswasamajorcontributiontotheconstructionofanewgener-ationofGTSbasedonintegratedmagnetobiochronol-ogy.ThemiddleMiocenetoearlyPleistocenemarinerecordfromSicilyandsouthernItalyhasbeenfunda-mentalforestablishingtherecentlydevelopedAstro-nomicalTimeScale(ATS).Inprospect,therearemanypotentialsstilltobeexploitedintheItalianmarinestratigraphicrecordforimplementingtheGTSbydefin-ingGSSPsofvariousCUs,improvingmagneto-biochronologyandextendingdownwardstheATS.

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简介：Usingthetimereversal(TR)-reversetimemigration(RTM)mixedmethod,thenumericalanalysistowardstheacousticfieldfordetectionandlocationoftargetsinlayeredmediaisperformed.Firsttheapproachesandstepsofthenumericalanalysisandsimulationforacousticfieldareproposed,then,theacousticfielddistributionofsingletargetandmultipletargetsarefurthercomputedbyusingtheapproachesofsingleemission-multiplereceivingandmultipleemission-multiplereceiving.Thenumericalsimulationresultsindicatethattargetdetectionandlocationcanbewellrealized.Bycomparison,goodresultsareobtainedfromthebothtwoapproaches,butlargetime-consumingisobservedinwayofmultipleemission-multiplereceiving,andsowouldbeunacceptable.Additionally,theimprovedwayisalsoproposedformultipletargetdetection.

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简介：Thispaperpresentsacopulatechniquetodeveloptime-variantseismicfragilitycurvesforcorrodedbridgesatthesystemlevelandconsiderstherealistictime-varyingdependenceamongcomponentseismicdemands.Basedonmaterialdeteriorationmechanismsandincrementaldynamicanalysis,thetime-evolvingseismicdemandsofcomponentswereobtainedintheformofmarginalprobabilitydistributions.Thetime-varyingdependencesamongbridgecomponentswerethencapturedwiththebestfittingcopulafunction,whichwasselectedfromthecommonlyusedcopulaclassesbytheempiricaldistributionbasedanalysismethod.Thesystemtime-variantfragilitycurvesatdifferentdamagestatesweredevelopedandtheeffectsoftime-varyingdependencesamongcomponentsonthebridgesystemfragilitywereinvestigated.Theresultsindicatethetime-varyingdependenceamongcomponentssignificantlyaffectsthetime-variantfragilityofthebridgesystem.Thecopulatechniquecapturesthenonlineardependenceamongcomponentseismicdemandsaccuratelyandeasilybyseparatingthemarginaldistributionsandthedependenceamongthem.

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简介：摘要目的探讨产道血肿形成的原因和处理方法。结果主要症状为会阴部疼痛、坠胀，见于阴道两侧沟、会阴侧切处及其深部。多见于初产妇。以产后4小时特别是产后2小时即可发现并有明显症状。结论为预防产道血肿的形成，要加强产后观察，认真细致地进行阴道缝合。

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简介：近两年一档亲子真人秀节目《爸爸去哪儿》火爆荧屏。对节目中的萌娃们来说,生存就是找食材,只要伸手总能要到;生存就是卖水果、蔬菜,只要嘟囔一声就有买家蜂拥而至。然而在现实里,成长就如《魔女宅急便》中琪琪的修行,充满艰辛。这部由日本著名动画大师宫崎骏导演的动画电影改编自角野荣子的同名小说,是一个典型的少年成长故事,在宫崎骏诸多以主人公人格成长为主要叙事线索的影片中具有鲜明的代表性。

简介：引发核聚变反应的太阳中央部位温度高达1500万摄氏度。这些热向外传递，到太阳表面时已降到6000摄氏度左右。但是传到“日冕”，也就是包围太阳“光球”的大气时，又高达100万摄氏度以上。也就是说，从太阳中央向表面缓缓下降的温度，到了上层大气，竞急剧上升了100倍以上，这个现象是与太阳有关的最大谜团。6000摄氏度的光球如何能将日冕加热到100万摄氏度？

简介：“安乐死”是一个很敏感的话题,涉及到方方面面,对此众说不一。到目前为止除个别国家外绝大多数国家都采取谨慎或否定的态度。但是,随着社会的发展,人们的健康水平得到普遍提高,“生命的质量”逐渐成为现代社会人类追求的目标,由此引发大部分专家学者及越来越多的普通百姓对“安乐死”表示肯定。但他们也担心由此而导致的一些有关伦理道德方面的问题。那么考

简介：人的一生就像花的历程，有雨雪，也有风霜，经历过了，才会有美丽的绽放。那个实习医生刚刚离去。我静静地躺在床上，透过巨大的玻璃窗望去，美丽的椰子树后是湛蓝高远的天空。在屋内，我能清晰地听到潮水轻抚沙滩的细切的声音，就像烛光中妈妈的催眠曲一样亲切温暖。