学科分类
/ 25
500 个结果
  • 简介:

  • 标签:
  • 简介:

  • 标签:
  • 简介:Thecross-Straitrelationshaveaccomplishedhistoricaltransition,andthusenteredintoaneraofpeacefuldevelopment.The'Taiwan-relateddiplomacy',alongwithitsimplementation,isincreasinglystrengtheningitsleadingroleandbearingfruitsintheprocessofexchanges,therebycreatingafavorableinternationalatmosphereforthepeacefuldevelopmentofcross-Straitrelationsandtheconsolidationofthe'oneChinaconfiguration'.

  • 标签: 两岸关系 台湾省 中国 统一
  • 简介:The20^ctcenturyiscomingtoacloseandthe21^ctcenturyapproaching.Atthejuncturewhenthetwocenturiesintersecteachother,thequestionofwarandpeacestillremainsamatterofparamountconcerntothewholehumanrace.Itcanbesaidthattheworldmilitarysituationin2000servedasalinkbetweenpastandfuture.ItpossessesbothastrongcontinuityreflectingchangesinworldmilitarysituationsincetheendoftheColdWar,aswellasaclearanddefinitefeatureoftransitionshowingpossibletrendsoftheworldmilitarysituationinthe21^ctcentury.

  • 标签: 世界军事 20世纪 军事战略 武器装备 军事技术
  • 简介:Aerodynamicforcesandpowerrequirementsinforwardflightinabumblebee(Bombusterrestris)werestudiedusingthemethodofcomputationalfluiddynamics.Actualwingkinematicdataoffreeflightwereusedinthestudy(thespeedrangesfrom0m/sto4.5m/s;advanceratiorangesfrom0-0.66).Thebumblebeeemploysthedelayedstallmechanismandthefastpitching-uprotationmechanismtoproduceverticalforceandthrust.Theleading-edgevortexdoesnotshedinthetranslatoryphaseofthehalf-strokesandismuchmoreconcentratedthanthatofthefruitflyinapreviousstudy.Athoveringandlow-speedflight,theverticalforceisproducedbyboththehalf-strokesandiscontributedbywinglift;atmediumandhighspeeds,theverticalforceismainlyproducedduringthedownstrokeandiscontributedbybothwingliftandwingdrag.Atallspeedsthethrustismainlyproducedintheupstrokeandiscontributedbywingdrag.Thepowerrequirementatlowtomediumspeedsisnotverydifferentfromthatofhoveringandisrelativelylargeatthehighestspeed(advanceratio0.66),i.e.thepowercurveisJshaped.Exceptatthehighestflightspeed,storingenergyelasticallycansavepowerupto20%-30%.Atthehighestspeed,becauseofthelargeincreaseofaerodynamictorqueandtheslightdecreaseofinertialtorque(duetothesmallerstrokeamplitudeandstrokefrequencyused),thepowerrequirementisdominatedbyaerodynamicpowerandtheeffectofelasticstorageofenergyonpowerrequirementislimited.

  • 标签: 大黄蜂 飞行方式 空气动力学 数字模拟
  • 简介:Basedontheknowledgelearningsystemof"self-centered",aclassicalGermanidealistphilosopher,JohannGottliebFichte,describedhisideasofhighereducationindetail,includingthenatureofuniversities,theacademicfreedom,andthemissionofuniversityteachers.Hebelievedthateachuniversity,asaninstitutionwithteachersandstudentsasitscomponentssettingupforthecontinuationofhumanintelligence,shouldalwaysstickto"academicfreedom"."Academicfreedom"isthenatureoftheexistenceofuniversities,andteachersareregardedasinheritorsofsacredideas,communicatorsofacademicknowledge,andguidersofmoraldirections.Theresearchfindingsofthispapercanbeausefulreferencefortheworldwidehighereducationresearch.

  • 标签: Fichte mission university UNIVERSITY teachers ACADEMIC
  • 简介:

  • 标签:
  • 简介:Inordertomeetthedemandsofmodern,information-basedsociety,highereducationinnaturalresourcemanagementneedstobetransformed.Enhancedmobilityofstudentsandstaff,multi-andtransdisciplinaryapproaches,aswellasinnovativeeducationalapproachesarecalledfor.Moreover,theurbancomponentneedstobebetterincorporated,asexemplifiedbytheemergingfieldofurbanforestry.Thispaperrelatestothedevelopmentsinhighereducationwithinthecontextofeducationonurbanforest...

  • 标签: