学科分类
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4 个结果
  • 简介:长江三角洲(UA-YRD)上的城市的凝块在水,土地,生态的环境,地点和交通的方面有一些优点。依靠资源环境库和另外的优点,UA-YRD完成了大开发。基于索引系统和全面评估的模型,自从1978,纸计算UA-YRD的发展水平。从1978~2007,开发水平以0.0333的年度率逐年增加了的结果表演,和开发的进程能被划分成三个阶段,即低速度的开发舞台(19781991),快速的开发舞台(19912000),并且高速度的开发舞台(20002007)。速度分别地是0.0083,0.0356和0.0766。在30年的发展期间,外国经济活动在开发有最大的效果,由交通,工业经济活动和电信列在后面(有序)。另外,不同驱动力在不同阶段有不同效果。纸建议更多的注意应该对高速度的发展阶段和重要驱动力被给予驾驶它的发展。同时,资源和环境的限制不应该被忽视,长有效的机制需要被证实在UA发展,资源利用和环境保护之中支撑和谐开发。一些比较研究应该着急地被执行有效地支持并且支持UA的持续开发,特别向进化,驱动力和braking力量。

  • 标签: 长江三角洲 城市群 优势 综合评价指标体系 生态环境 资源环境
  • 简介:Miaowan()ophiolite是在Yangtzecraton的北边缘附近外面收割的高度割下的ophiolitic建筑群。这建筑群的岩石由组成,从底部到顶,局部地包含podiform铬铁矿的harzburgitetectonite,纯橄榄岩,分层、各向同性的斑粝岩,sheeted堤建筑群(SDC),有燧石豆荚和层的元枕头熔岩,和构造地设置的大理石。SDC向下是Miaowanophiolitic顺序,和等级的很重要、重要的部分进斑粝岩和ultramafic岩石,并且进元枕头熔岩向上。一些堤保存单程的chilled边缘,典型地代表extensionalophiolitic背景而大多数保存两倍chilled边缘,在寒心的方向能的情况中决定了。SDC主要由元辉绿岩(粗玄岩)组成,元斑粝岩和ultramafic的meta-plagiogranite,和小数量摇。LA-ICP-MS锆石标明日期收益一上面拦截年龄1026?????????????????????慩睯湡??灯楨汯瑩??丠潥牰瑯牥穯楯??慵杮楬杮?

  • 标签: 扬子克拉通 LA-ICP-MS 斜长花岗岩 豆荚状铬铁矿 洋中脊玄武岩 拉斑玄武岩
  • 简介:Publicwillingnesstopay(WTP)forurbanriversrestorationwasinvestigatedinShanghai,NanjingandHangzhouinChinawithasampleof1,285.ThefactorsinfluencingpositiveWTPagainstzeroWTPareanalyzedusingabinarylogitmodel.Theresultsindicatethatincome,Huji(residentialregistration)status,householdsize,homepropertyownership,riverfrontaccess,andattitudestowardcurrentwaterqualityarestatisticallysignificantinthelikelihoodofpositiveWTP.ItisalsofoundthatrespondentswithoutlocalHujiarelesswillingnesstopaypositivelyinpooledsampleandShanghaisample.InthegroupholdingpropertyrightofhousebutwithoutlocalHujiislesswillingnesstopaypositivelyinHangzhou.RespondentsinNanjingaremorewillingnesstopaypositivelythanthoseinHangzhou.Mostcommonargumentsagainsttopayfortherestorationare"government’sduty","lowincome","non-local-Huji"and"lackoftrustinthegovernmentinhowitspendsmoney".TheresultsaregenerallyconsistentwiththehypothesisandspecificsituationsinChina.Thefindingsmakesomecontributionstothenon-marketvaluationstudiesaswellasprovideusefulinformationforpublicpolicymakinginChina.

  • 标签: 城市河流 长江三角洲 河道整治 Logit模型 居民 支付意愿
  • 简介:ByusingNCEP/NCARdailyreanalysisdataanddailyprecipitationdataof740stationsinChina,relationshipsbetweenthepositionvariationoftheWestPacificsubtropicalhigh(WPSH)andthediabaticheatingduringpersistentandintenserainsintheYangtze-HuaiheRiversbasinarestudied.TheresultsshowthatthepositionvariationofWPSHiscloselyassociatedwiththediabaticheating.Therearestrongapparentheatingsourcesandmoisturesinksinboththebasin(tothenorthofWPSH)andthenorthofBayofBengal(tothewestofWPSH)duringpersistentandintenserainevents.Inthebasin,Q1zbeginstoincrease3daysaheadofintenserainfall,maximizes2dayslaterandthenreducesgradually,butitchangeslittleafterprecipitationends,thuspreventingtheWPSHfrommovingnorthward.InthenorthofBayofBengal,2daysaheadofstrongrainfalloverthebasin,Q1zstartstoincreaseandpeaks1dayaftertherainoccurs,leadingtothewestwardextensionofWPSH.Afterwards,Q1zbeginsdecliningandtheWPSHmakesitseastwardretreataccordingly.Basedonthecompleteverticalvorticityequation,inmid-troposphere,theverticalvariationofheatinginthebasinisfavorabletotheincreaseofcyclonicvorticitynorthofWPSH,whichcounteractsthenorthwardmovementofWPSHandfavorsthepersistenceofrainbandsoverthebasin.TheverticalvariationofheatinginthenorthofBayofBengalisinfavoroftheincreaseofanti-cyclonicvorticitytothewestofWPSH,whichinducesthewestwardextensionofWPSH.

  • 标签: 热带气象 气象学 天气学 气团