简介：基于国内经济形势向好的背景下,预计下半年全国规模以上港口货物吞吐量增速将有所回升。结合目前最新数据,预计2018年年货物吞吐量增速将保持在4%左右,总量达132亿吨左右。

简介：《中华人民共和国船舶吨税法》（简称＂吨税法＂）于7月1日正式实施。吨税法较以往有4处明显改进：一是确认了吨税执照电子信息的法律效力,为海关吨税申缴无纸化改革提供了法律支撑;二是明确了警用、改造船舶的免征吨税资格,保障了执法和民生需要;三是将多缴吨税的退税申请时间由一年延长为三年,更加符合进出境船舶的作业特点。

简介：文章从政府投入、行业主导、技能培养、师资队伍建设、教学改革等方面对澳大利亚和我国高职教育进行了比较研究，指出了我国高职教育存在的问题，并在此基础上探讨了改革我国高职教育的途径。

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.