学科分类
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30 个结果
  • 简介:IntroductionAlongwithintegratedregionalcooperation,interegionalasociationhasbenthemainpartofregionaleconomicdevelopmentinsome...

  • 标签: REGIONAL DEVELOPMENT interregional STATUS CHONGQING
  • 简介:Basedupontheformationandevolutionofoasisandthefactorsrestrictingthecoordinateddevelopmentofoasiseconomyandenvironment,thispaperpresentsagoalofthedevelopmentincoordination.Itsuggeststhatthesustainablesurvivalanddevelopmentofoasiscouldbeensuredonlyiftheoasis-desertandwatersourceecologyaremanagedinacombinedwaytoformamacrosystem.Inlightwiththeabovementioned,theapproachtothedevelopmentofeconomyandenvironmentofoasisinaridareashoulddependupontheestablishmentofanoasisecologicalandeconomicsystem,whichsuitsthearidenvironmentandpromotestheefficiencyofresourceconfiguration,stabilizeseconomicincrementandbenefitsecologicaldevelopment.

  • 标签: 绿洲 开发 环境 干旱区域
  • 简介:在Bashang区域的自然条件被容易被自然灾难影响并且加强了人的活动的带的转变描绘。极其易碎的eco环境也是容易的把desertification形成并且发展。在从1978~1996的18年里,在地图的范围以内的Bashang的desertified陆地区域将近加倍,2199.11km的全部的增加,每年平均122.17km2的增加。而且,严重,desertified区域很快增加。在Bashang的陆地desertification是自然因素和荒谬的人的经济活动的联合结果。栽培陆地扩大,人口生长,和过度放牧的aggrevatedesertification开发。

  • 标签: Bashang area DESERTIFICATION IMPACT of HUMAN
  • 简介:I.DevelopmentSituationTheregionalongtheYangizeRiveristhenationalmajorexploitationbeltandthebondoftheeasternandwesternpartsofC...

  • 标签: regional economy development strategy industry TRANSPORTATION
  • 简介:LocatedatthesoutheasterncoastofChina,Fujianwasoneoftheprovinceswhichwereearlieropenedtonavigationandhadtraderelationswiththew...

  • 标签: Fujian outward ORIENTED ECONOMY REGIONAL DIFFERENTIATION
  • 简介:I.IntroductionInthispaper,ourmaingoalistosetheregionaldisparitiesinsocioeconomicdevelopmentinJiangsuProvince.Wewilalsoinvest...

  • 标签: socio economic DEVELOPMENT areal DISPARITY factor
  • 简介:I.AssesmentoftheConditionsfortheDevelopmentofIndustriesintheBeijingKowloonEconomicBeltTheenvironmentalconditionsfortheeconom...

  • 标签: LEADING industry industrial center ECONOMIC BELT
  • 简介:I.InternationalRiversandtheLancangMekongRiverInternationalriversaredefinedastheriverswhichflowacrostwoortwomorecountries.Upt...

  • 标签: INTERNATIONAL RIVERS cooperation DEVELOPMENT Lancang MEKONG
  • 简介:ThispaperexaminestheexperimentalstudyoninfluenceofmaterialcomponenttononlinearrelationbetweensedimentyieldanddrainagenetworkdevelopmentcompletedintheLab.Theareaofflumedrainagesystemis81.2m2,thelongitudinalgradientandcrosssectionslopearefrom0.0348to0.0775andfrom0.0115to0.038,respectively.Differentmodelmaterialswithamediumdiameterof0.021mm,0.076mmand0.066mmcoverthreeexperimentseach.Anartificialrainfallequipmentisasprinkler-systemcomposedof7downwardnozzles,distributedbyhexagontypeandagivenrainfallintensityis35.56mm/hr.cm2.Threeexperimentsaredesignedbyprocess-responseprincipleatthebeginningtheψshapedsmallnetworkisdugintheflume.Runningtimespansare720m,1440minutesand540minutesforRunsⅠ,ⅣandⅥ,respectively.Threeexperimentsshowthatthesedimentyieldprocessesarecharacterizedbydelayingwithavibration.Duringnetworkdevelopmenttheenergyofadrainagesystemisdissipatedbytwoways,ofwhichoneisincreasingthenumberofchannels(rillandgully),andtheotheroneisenlargingthechannellength.Thefractaldimensionofadrainagenetworkisexactlyanindexofenergydissipationofadrainagemorphologicalsystem.Changeofthisindexwithtimeisanunsymmetricalconcavecurve.Comparisonofthreeexperimentsexplainsthatthevibrationandthedelayingratioofsedimentyieldprocessesincreasewithmaterialcoarsening,whilethenumberofchanneldecreases.Thelengthofchannelenlargeswithmaterialfining.Thereexistsnon-linearrelationshipbetweenfractaldimensionandsedimentyieldwithanunsymmetricalhyperboliccurve.Thebsolutevalueofdelayingratioofthecurvereduceswithtimeunningandmaterialfining.Itischaracterizedbysubstitutionofsituationtotime.

  • 标签: 材料部件 网络 沉积产量 非线性的关系 实验
  • 简介:通过对扎龙湿地Landsat7ETM+影像进行计算机自动分类的实验研究,探讨了提高湿地遥感分类精度的方法与途径.实验所采用的首先对遥感影像进行非监督分类,再利用非监督分类生成的分类模板加以修改补充后进行监督分类的方法,经过误差矩阵的精度评价,可以获得研究区湿地遥感分类较高的分类精度.利用上述分类方法对3种ETM+不同波段组合的影像进行具体的遥感分类比较研究发现,选择ETM+7、5、3影像进行分类有助于提高扎龙湿地遥感分类的精度.为了提高湿地遥感分类的精度,还必须运用人机互译判读方法.

  • 标签: ETM+ 扎龙湿地 分类精度 非监督分类 遥感影像 波段
  • 简介:编制县(市)政区之浅见郭晓红(福建省地图出版社)在各类地图中,县(市)政区是非常重要的种之一。它的用途广泛、政治性强、现势性要求高。县(市)政区是以反映行政区划、政治、行政中心为主要内容的地图。在经济改革,行政体制也有了很大的改革,比如福建...

  • 标签: 行政区划界线 地形图 现势资料 比例尺 居民地 平面图形