学科分类
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188 个结果
  • 简介:《跨学科史学期刊》(theJournalofInterdisciplinaryHistory)由美国麻省理工学院出版社(MITPress)出版。该期刊创办于1970年,每年出版4期,主要收录将史学研究与经济学、人口统计学、政治学、社会学以及心理学等相关学科研究相结合的学术成果,所设立的栏目主要有学术论文、研究纪录(researchnotes)、学术评论、书评等。

  • 标签: JOURNAL 史学期刊 跨学科 of 美国麻省理工学院 简介
  • 简介:Themercurycontentin158fishesand28musselsintheSecondSonghuariverweredetected.Therangeofmercuryconcentrationsinfishesandmusselswas0.02-0.66mg/kgand0.002-0.056mg/kg,respectively.Thehistorychangeofmercurycontentinfisheswasanalyzedinthispaper.Fromupstreamtodownstream,theaveragemercuryconcentrationsinfishesincreasedwiththeincreaseofthedistancetotheheadstream,thendecreasedinthedownstreamofWujiazhantown(samplingsite).Thefactilluminatedthatthesourceofmercurycontaminationwasmercuryinsediment.Inthedifferentspeciesoffishes,themercuryconcentrationinParasiburusasvtuswasthehighestandtheorderofmercurydistributioninfisheswas:themercuryvalueinfishesintheriverbottom>thatinfishesinthesurfaceandthatinpredaciousfishes>thatinherbivorousfishes.Intheinvestigation,therewereamountoffisheswhosemercuryvalueexceededthecriterionforthatinfishesthatsuggestedthatthemercurycontaminationintheSecondSonghuaRiverhavenotcompletelybeeneliminateduntilnow.

  • 标签: 污染物 中国 松花江 水污染 环境保护
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  • 简介:Accordingtotheideasandconceptsofsystemsdynamicofcontinentstructure,usingpreviousinformationrelatedtothestudyarea,combininganalysesonorogenicbelt,basinandmagmaticrock,thepresentpapersynthesizesthetectono-sedimentarydevelopmentofsoutheasterncoastregion,China,withspecialemphasisonthemountainmaking,basiningandmagmafcactivity.ThetectonicevolutionafterLateCaledonianorogenywasdominatedbyalternatingriftingandconverging,subsidinganduplifting,mountainmakingandbasiningincentralandsouthernpartsofsoutheasternChinaandtheadjacentregionstotheeastandwest.Seventeengeologicevents,nineeventsofplateorterrainconvergence,andcontinentalcrustaccretion,aswellaseighteventsofintracontinentalriftingandbasinfaulting,arecloselyrelatedtothetectonicandsedimentaryevolutionofthestudyarea.Theaccompaniedintenseandfrequentsedimentation,folding,faulting,magmatismandore-formingprocessallowedhugecoal

  • 标签: tectono - SEDIMENTARY HISTORY basin-orogen analysis
  • 简介:Adistinctivepatternofovipositionlesionsoccursonaginkgoaleanseed,Yimaiacapituliformis,whichlikelywasinflictedbyakalligrammatidlacewingwithalong,sword-like,plant-piercingovipositor.Thisnewlyrecordedovipositiontype,DT272,occursinthe165million-year-oldJiulongshanFormation,ofMiddleJurassicage,inNortheasternChina.DT272consistsfromthreetoseven,approximatelyequallyspacedlesionswithsurroundingcallustissue,thefabricatorofwhichtargetedfleshyouterandinnertissuesofaginkgophytefruit.Thisdistinctivedamagealsoisknownfromthefleshyattachmentpadsurfacesofbasalbennettitaleanbracts.Examinationofthelifehistoryofthisprobableginkgoalean-kalligrammatidovipositioninteractionindicatesthatthespacingoftheeggsinsubstratetissuesdisfavoredinter-larvalcontact,butlittlecartbesaidofdefenseandcounterdefensestrategiesbetweentheplanthostandthenewlyhatchedimrnatures.

  • 标签: DAOHUGOU INNER Mongolia Jiulongshan Formation Kalligrammatidae
  • 简介:Anacademic"SeminaronTibetanHistory",hostedbyChinaTibetologyResearchCenter,washeldinBeijingfromSeptemberItoSeptember3,2002.ProfessorsandExperts.inTibetanhistoryfromseveralTaiwanuniversities,suchasTaiwanPoliticsUniversity,CultureUniversity,ZhongzhengUniversity,SouthChinaUniversityandMingchuanUniversitytookpartintheseminar,andmorethan3omainlandscholarsfromTibet,Beijing,NanjingandChengdualsoparticipatedintheseminar.

  • 标签: 中国 西藏 历史发展 台湾地区 学术思想
  • 简介:损坏结构的剩余能力抵抗进一步的负担在最佳的地震设计并且地震以后的加强是必要的。在不同装载历史下面的对的具体框架横梁的hysteretic特征上的试验性的研究被执行在能量耗散和成员的失败特征上探索负担历史的影响。基于测试结果,横梁的失败被定义,并且在在周期的负担下面并且从骨骼的失败时刻之间的关系弯被提出。基于排水量和能量耗散,最后,为对的具体横梁损坏失败评估的一个模型被开发。在这个模型,变丑水平的效果,累积浪费精力,和对的水泥上的装载历史,横梁损坏失败被合并,这样它对随机的地震力量适用。

  • 标签: 钢筋混凝土 地震力 负重记载 地震工程学