简介：ＴｈｅＭａｉｋｅｏｆＣｈｉｎａ＇ｓＮｏｒｔｈｗｅｓｔＴｈｅｙ＇ｒｅｈｏｎｅｓｔ，ｈａｒｄｗｏｒｋｉｎｇ，ｐｏｏｒ，ａｎｄｃｏｍｐｌｅｔｅｌｙｄｅｖｏｉｄｏｆｇｒｅｅｄ－ｔｈｅｙ＇ｒｅＣｈｉｎａ＇ｓｓａｌｔｏｆｔｈｅｅａｒｔｈ．ＢｙＨＥＹＡＮＧＵＡＮＧ...

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简介：1.GeneralreviewThefirst330kVtransmissionlineinNorthwestChinafromLiujiaxiaHydroPowerStationthroughQinanSubstationtoTangyuSubstationwascommissionedin1972.Intheseventies,accompany-ingthecommissioningofHanchengandQinlingThermalPowerPlantsinShaanxiProvince,the330kVtransmissionlinesfrom

简介：ＧｒａｖｉｔａｔｉｏｎａｌｅｆｆｅｃｔｏｆｗａｔｅｒｃｉｒｃｕｌａｔｉｏｎｉｎｔｈｅｎｏｒｔｈｗｅｓｔＹｕｎｎａｎＭｉｎ－ＹｕＪＩＡ；（贾民育）Ｓｈａｏ－ＡｎＳＵＮ；（孙少安）Ａｉ－ＭｉｎＸＩＡＮＧ；（项爱民）ａｎｄＤｏｎｇ－ＺｈｉＬＩＵ（刘冬至）（...

简介：ＲｅｍａｒｋａｂｌｅＡｃｈｉｅｖｅｍｅｎｔｓｉｎＰｏｖｅｒｔｙＡｌｌｅｖｉａｔｉｏｎｉｎＮｏｒｔｈｗｅｓｔＣｈｉｎａ￥／／Ｔｈｅｅｘｔｅｎｔｏｆｐｏｖｅｒｔｙｉｎｔｈｅ＂ＳａｎＸｉＡｒｅａｓ＂ｈａｓｂｅｅｎｇｒｅａｔｌｙａｌｌｅｖｉａｔｅｄｉｎｔｈｅ...

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简介：Thispaperpresentsapreliminaryassessmentofthehydrogeologicalcharacteristicsofakarstmountainouscatchment,theSuoiMuoiRivercatchment,inthenorthwestofVietnam.Thecatchmentislocatedat600-700ma.s.1.andcoversanareaof284km.Exposedlimestoneoccupies32%ofthetotalcatchmentarea.Varioustypesofassessmentshavebeencardedout,includinggeologicalandhydrogeologicalfieldsurveys,cavesurveys,dye-tracertests,meteorologicalandsurfacewatermonitoring.Geologicalstudiesandcavesurveyshaveidentifiedthemostimportantactivecave/conduitsystemswithinthecatchment.Althoughthesedataareessential,theyareinsufficienttomakeacomprehensiveappraisalofthehydrologicnatureofthecatchmentunderinterest.Anattemptwasmadetocalculateaglobalwaterbalanceofthecatchment,basedonshort-term(15months)meteorologicalandstreamfiowrecords.Theresultsshowthat,despitetheexistenceofanumberofsubstantialcavernconduitsystems,thegroundwatersystemofthecatchmentisgovernedbythefracture/fissurematrix.Thecavernconduitsystemsonlycollectgroundwaterfromtheadjacentfracturematrixand/orconnecttopographicallyisolatedsurfacewatercourses.Thegroundwaterstorageofthecavernconduitsystemsappearstoberegionallyinsignificantincomparisonwiththegovernedfracturematrixgroundwatersystem.``

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简介：Sand-duststormsaretheresultoftheintegratedinfluencesofclimate,geography,societyandhumanfactors.Atheoreticalframeworkisbuilttoexplainthecoherenceofpopulationgrowth,agriculturechangeandenvironmentaldegradation.Onthebasisoftheanalysisofthecausesofthesand-duststormintermsofhumanfactors,adiscussionwillbegiventoshowthatthesefactorsareinternallyconsistentwiththetheoreticalframework.Afterthat,itwilllookatChina'sAgenda21andtrytofindrelevantmeasurestoreducesuchlargesand-duststormshappeninginNorthwestChinaandeventuallymakethisareadevelopsustainably.

简介：ThefirstwindpowerprojectinGansu,YumenWindPowerFarmbelongingtoGansuJieyuanCompanywasbuiltupin1997.Upto2005,therewere74windpowerunitsinoperationinJiajinPowerGrid.Theirinstalledcapacitytotaled52.2MW.Atpresent,thethirdandfourthphaseprojectsareunderconstruction.Thesetwoprojectswillbeequippedwith68x850kWunits.Itisexpectedthatalltheunitswill

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简介：ＵｐｐｅｒｍａｎｔｌｅｆｌｏｗｂｅｎｅａｔｈｔｈｅＮｏｒｔｈｗｅｓｔｏｆＣｈｉｎａａｎｄｉｔｓｌｉｔｈｏｓｐｈｅｒｉｃｄｙｎａｍｉｃｓＪＩＡＮ－ＨＵＡＨＵＡＮＧＩ（黄建华）；ＸＩＡ－ＨＵＡＣＨＡＮＧＩ（常筱华）ａｎｄＲＯＮＧ－ＳＨＡＮＦＵＩ傅容珊）（...

简介：Itisaverycomplicatedproblemtoestimateevapotranspiration(ET)overalargeareaoflandsurface.Inthispaper,theevapotranspirationestimationmodelsfordensevegetationandbaresoilarepresented,basedontheinformationofparameterslikevegetationcover-degreeandsurfacealbedo.Combinedwithvegetationcover-degreedata,amodelforregionalevapotranspirationestimationovertheheterogeneouslandscapeisderived.ThroughacasestudyusingremotesensingdataoverNorthwestChina,theaccuracyofthemodelforregionalevapotranspirationestimationischecked.Theresultshowsthattheaccuracyofthemodelissatisfactory.ThefeaturesofevapotranspirationoverNorthwestChinaarealsodiscussedwiththeapplicationofthemodel.

简介：西北中国包括XinjiangUgyur自治区域，Qinghai省，Gansu省，NingxiaHui自治区域和Shaanxi省，盖住308x10~4km~2。它位于温暖适度的地区，气候干旱或半干旱。降水是很少见的，但是蒸发极其高。气候是干燥的，水资源是缺乏的，theeco环境是易碎的，并且水资源的分发是不平的，降水是唯一的输入，并且蒸发是内陆河，和猛冲里的唯一的输出，在这个区域，与对方一起的表水和地下水变化为多次，它有益于水资源的存储和利用。在这个区域的平均降水是232公里，全部的降水数量是7003x10~8m~3/a，表水资源是1891x10~8m~3/a，全部的自然地下水资源是1150x10~8m~3/a，全部的有效水分资源是438x10~8m~3/a，和全部的水资源是8m~3/a和人均的水资源是的1996x10~2278m~3/a。整个区域的水资源是5.94x10~4m~3/(a.km~2)，仅仅是在中国的五分之一个平均值。现在，有效水分资源是876x10~8m~3/a，地下水在之中是贴近的130x10~8m~3/a。

简介：Theverticalmotionsandsecondarycirculationofanexplosivelydeepeningoceaniccyclone,whichoc-curredovertheNorthwestPacificOceanandwasinconjunctionwith200hPa-leveljetstreamandhascentralpressurefallsof33.9hPa/24h,havebeencomputedfromseven-levelnonlinearbalancemodelandSaw-yer-Eliassen-Shapiroequationforthetransverseageostrophiccirculation.Theverticalmotionsarepartitionedintocontributionsfromlarge-scalelatentheatrelease,effectofcumulusheating,thermaladvection,differen-tialvorticityadvection,etc.,whilethesecondarycirculationstreamfunctionispartitionedintocontributionsfromgeostrophicdeformation,transferofmomentumandheatintheareaofcumulusanddiabaticheating.Theprincipalresultsarethefollowing.Large-scalelatentheatreleaseisverycrucialtotheexplosivede-velopmentofcyclones.Ifthereisenoughtransferofmoisture,thepositivefeedbackprocessbetweenascentofairandlarge-scaleheatingwouldwork.Thecumulusheatingandthetransferofmomentumandheatintheareaofcumulusplayanimportantroleduringtheexplosivelydeepeningstage.Thermaladvectionistheinitialtriggeringconditionforlarge-scaleheatingandtheconditionalinstabilityfortheconvectionofcumulus.

简介：统计、典型年的作文方法被用来与ElNino和LaNifia事件在关系学习西北太平洋台风活动。结果显示台风趋于在ElNifio年里不活跃并且在拉·尼娜年和它里活跃也依赖于事件的发作和台风的开始的区域。与在频率和海面温度(SST)之间的ElNifio和拉·尼娜年和时间落后关联里的台风活动的频率的统计特征。有用信息被为台风出现的预言提供。另外，单个价值拆卸(SVD)方法被使用学习在重力势领域和SST地之间的关联。结果证明在ElNino年里的由空至海的联合是相反的让台风发展，它与一个更小的数字发生。相反的状况与拉·尼娜年被发现。

简介：InancientChina,thecompositionofatypicalfamilywasbasicallythesameasthecompositionofthenation.Familes,mostscholarssuggest,composedthebackboneofancientChinesesociety;thatculturewasfamilycentered,andtheminoritypeopleshelpedfromthefoundationuponwhichsocietywasbuilt.Thatisnotnecessarilythecase,butthesuggestionputsforwardtheconceptthatthefamilyunitwasthemainfeatureofancientChinesecultureandsociety.

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简介：ThiscasestudyoutlinestheproblemsfacedbythepeoplesoftheHexiCorridor.Theseproblemsareseriousandurgent,andarerepresentativeofthosefacedbyothercommunitiesrightacrosswesternChina.Therootcausesareoutlinedandsomeremediesaresuggested.ThepracticalmeasuresproposedunderChina'sNationalActionPlantoCombatDesertificationaredescribedanddiscussed.

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