简介：在国际货运业务中,NVOCC（无船承运人）模式经过几十年的发展已经日趋成熟,传统货运代理企业的生存空间越来越小,货运代理企业NVOCC化已成大势所趋.只有从传统业务向全程物流链拓展,形成门到门的全程物流服务能力,才可能在激烈的市场竞争中脱颖而出,获得生存和发展的空间.

简介：历史性街区是开展乡村旅游的重要文化资源，是实施乡村振兴战略的一个重要途径。文章以定海区白泉村历史性街区为例，从研究历史性街区渊源、文化入手，结合白泉高铁集散中心背景，对其历史性街区功能重构提出建议。通过功能布局调整、街道景观设计、建筑风貌等方面的规划与控制，延续历史街区文化底蕴，构建历史街区文化符号体系，使历史性街区成为乡村振兴的一个有效途径。

简介：普华永道是普华永道会计师事务所（PricewaterhouseCoopers,PwC）的简称,是世界上最顶级的会计师事务所之一,也是国际四大会计师事务所之一。本文是普华永道根据eascy的要素建立研究模型,对整个汽车行业进行了重新思考,并总结出一份深度报告,分析未来汽车行业、企业、用户等的发展趋势和影响。

简介：Acomplianttowerismodeledasapartiallydry,partiallytapered,dampedTimoshenkobeamwiththesuperstructuremodeledasaneccentrictipmass,andanon-classicaldampedboundaryatthebase.Thefoundationismodeledasacombinationofalinearspringandatorsionalspring,alongwithparallellinearandtorsionaldampers(Kelvin-Voigtmodel).Thesuperstructureaddstothekineticenergyofthesystemwithoutaffectingthepotentialenergy,therebyreducingthenaturalfrequencies.Theweightofthesuperstructureactsasanaxialcompressiveloadonthebeam,reducingitsnaturalfrequenciesfurther.Theemptyspacefactorduetothetruss-typestructureofthetowerisincluded.Theeffectofsheardeformationandrotaryinertiaareincludedinthevibrationanalysis;withthenon-uniformbeammode-shapesbeingaweightedsumoftheuniformbeammode-shapessatisfyingtheendcondition.TheweightsareevaluatedbytheRayleigh-Ritz(RR)method,andverifiedusingfiniteelementmethod(FEM).Theweightofthesuperstructureactsasanaxialcompressiveloadonthebeam.Kelvin-Voigtmodelofstructuraldampingisincluded.Apartofthestructurebeingunderwater,thevirtualaddedinertiaisincludedtocalculatethewetnaturalfrequencies.Aparametricstudyisdoneforvariousmagnitudesoftipmassandvariouslevelsofsubmergence.ThecomputationalefficiencyandaccuracyoftheRayleigh-Ritzmethod,ascomparedtotheFEA,hasbeendemonstrated.Theadvantageofusingclosed-formtrialfunctionsisclearlyseenintheefficacyofcalculatingthevariousenergycomponentsintheRRmethod.