简介:Todevelopuniformandseismicenvironment-dependentdesignspectrum,commonaccelerationresponsespectralcharacteristicsneedtobeidentified.Inthispaper,abi-normalizedresponsespectrum(BNRS)isproposed,whichisdefinedasaspectrumofpeakresponseaccelerationnormalizedwithrespecttopeakaccelerationoftheexcitationplottedvs.thenaturalperiodofthesystemnormalizedwithrespecttothespectrumpredominantperiod,Tp.Basedonastatisticalanalysisofrecordsfromthe1999Chi-Chiearthquake,theconventionallynormalizedresponsespectrum(NRS)andtheBNRSareexaminedtoaccountfortheeffectsofsoilconditions,epicentraldistance,hangingwallanddamping.ItisfoundthatcomparedtotheNRS,theBNRSismuchlessdependentonthesefactors.Finally,somesimplerelationshipsbetweentheBNRStoraspecifieddampingratioandthatforadampingratioof5%,andbetweenthespectrapredominantperiodandepicentraldistancefordifferentsoiltypesareprovided.
简介:<正>YoucouldprobablycountontwohandsthenumberoftimesthatI’veseenthesuncomeup.ItissoforeigntomethatwhenIheardfromexpatsinChinathatoneofthebestlocalsightshadtobeviewedjustaftersunrise,IreallyfeltthatwhateveritwashadtobetrulyspectacularorelseI’dgiveitamiss.ButwhenIwasassuredthatthiswouldbelikecomingtoBeijingandnotseeingTiananmenSquare,Igavein.Anyparkoropenareawoulddo,butIchosetogo
简介:这研究的目的是在1999在中央台湾在ML7.3假装聪明的地震以后为碎片流动(为碎片流动被触发的批评降雨)在降雨阀值分析可变性。有不同地质的条件的二个学习地点在地震区域被调查。Streambed调查被进行连续地监视在1999和2006之间的碎片流动。在7年的学习时期期间,每个碎片流动事件被识别,并且溪流床描绘了。结果证明为碎片流动的降雨阀值只在假装聪明的地震以后是显著地更低的,但是逐渐地恢复了。迄今为止,这降雨阀值仍然是比在地震以前的原来的水平低的。在降雨阀值的这可变性仔细与在碎片流动,它由于山崩很快增加了的开始区域的沉积材料的数量有关正在源于地震。随沉积材料的增加,降雨阀值在跟随假装聪明的地震的第一年期间严重地被降低。然而,重降雨动员了沉积材料,引起碎片流动并且下游地搬运沉积。与在沉积材料的减少,降雨阀值随着时间的过去逐渐地恢复了。而且,碎片流动仅仅在有足够的沉积材料引起重要运动的潜水艇盆发生了。因此,这些结果证实在碎片流动的开始区域的沉积材料是为碎片流动的降雨阀值的一个关键部件。
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简介:BriefIntroductiontoELTECS-Chi-LELTECS-Chi-LisaBritishCouncilChinainternetdiscussiongroupforChineseELT(Englishlanguageteaching)professionalswithaninterestintheteachingofEnglishasaforeignlanguage.LaunchedinForeignLanguageTeaching&ResearchPressbyHelenaKennedyQC,ChairoftheBritishCouncilon9thOctober1998,thenetworkhasnowover150subscribers,amongwhommorethan40arefromtheUK,Belgium,Japanandothercountries.
简介:RosalindBurford:IntroductiontoELTECS-Chi-LIamdelightedtowelcomeyoutoELTECS-Chi-L,anelectronicdiscussionforumforELTprofessionalsinChina.Bytheyear2,000itisestimatedthatonebillionpeoplewillbelearningEnglish.Itisthemainlanguageofbooks,newspapers,internationalbusiness,science,technology,travel,diplomacy,sport,musicandsoon.WhenEnglishissomuchindemanditmakessensetoshareideaswithcolleagues.That’swhytheBritishCouncildecidedtoestablishaninternationalEnglishLanguageContactsScheme-EL-TECSforshort.
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:<正>Purpose:Thepurposeofthepresentstudywastoexaminetheeffectsofa24-weekTaiChiexerciseinterventiononbalanceandotherphysicalchangessuchasflexibilityandreactiontime(RT)amonghealthyoldermales.Methods:Thirty-eightmalesubjectsaged55—65yearswithoutpriorTaiChiexperiencewererecruitedfromalocalcommunityinShanghai,China.A60-minTaiChiexercisesessionwasperformedthreetimesaweekfor24weeks.ChangesinRT,sit-and-reachflexibilityandbalance(staticbalancewitheyesopenandclosedrespectively)weremeasuredbeforeandaftertheTaiChiintervention.Results:Afterthe24-weekTaiChiintervention,thechoiceRT(p<0.05)decreased,andsit-and-reachflexibilityimproved(p<0.01)overthepre-test(7.8±6.2vs.7.1±3.0cm).Swaylength,area,X-axisdeviationamplitudeandK-axisdeviationamplitudeperformancedecreasedsignificantlyaftertheinterventionwithadouble-footstancewitheyesopen(p<0.05).Swaylength,areaandaverageswayspeedshowedastatisticallysignificantdecreaseaftertheinterventionwiththedouble-footstancewitheyesclosed.Inthesingle-footstancewitheyesopencondition,swaylengthandaverageswayspeedshowedastatisticallysignificantdecrease(p<0.05).Conclusion:The24-weekTaiChiexerciseinterventionhadapositiveinfluenceonbalancecontrolinoldermales.