简介：ThepurposeofthispaperistogivearelativelyelementaryanddirectproofoftheDeltaInequality,whichplaysaveryimportantroleinthestudyoftheextremalproblemofquasiconformalmappings.

简介：套装使您可轻而易举地做出漂亮的蚀刻样式来．该套装中不含酸、不含有害气体、不会对皮肤产生腐蚀。且该材料用肥皂水就可以清洗掉。

简介：ＴｈｅｆｅｍｉｎｉｚａｔｉｏｎｏｆｍｉｇｒａｔｉｏｎｉｎｔｈｅＰｅａｒｌＲｉｖｅｒＤｅｌｔａＤＡＩＦａｎＧｕａｎｇｚｈｏｕＥｎｇｌｉｓｈＬａｎｇｕａｇｅＣｅｎｔｅｒ，ＺｈｏｎｇｚｈａｎＵｎｉｖｅｒｓｉｔｙ，Ｇｕａｎｇｚｈｏｕ５１０２７５Ａｂｓｔｒａ...

简介：ThispaperdealswiththedevelopmentandevolutionofmodemYellowRiverdeltaandtheerosionordepositionratesofitsdifferentsections.InJune,1996,YellowRiversterminalcoursewasartificiallyturnedeastwardstoemptyintotheseaandthenthe11thlobeofthemodernYellowRiverdeltabegantoform.Thiscoursechangemaymarkthebeginningofthe3rdsubdeltaformation.Asaresultofthat,theYellowRiverdeltaadvancestowardseastbynorthwiththe1st,2ndand3rdsubdeltasarrangedinsuccession.Coastzoneinthedeltaicareaisdividedinto7differentsectionsaccordingtotheirdifferenterosionordepositionrates:therelativelystablesectionfromDakouRivertoShunjiangStream,theweaklyretreatingsectionfromShunjiangStreamtotheTiaoheRivermouth,thestronglyretreatingsectionfromtheTiaoheRivermouthtothestation106,theartificiallystablesectionduetostonedamprotectionfromthestation106toGudongOilfield,thestrongdepositionsectionfromGudongOilfieldtoDawenliuHaipu,theweaklydepositionsectionfromDawenliuHaiputotheZimaiStreammouth,andthestablesectionfromtheZimaiStreammouthtotheJiaolaiRivermouth.Itispredictedthattheerosionanddepositionsituationsofthesectionswillnearlyremainthesamein10years,buttheretreatingandsilting-uprateswilltendtobecomeslowergradually.Humanactivitieshaveanevidentinfluenceonthechangesofthecoastline.

简介：生活总是公平无比……还记得上期那颗红色的小M&M豆斯所历的遭遇吗？它差点就被人充作果腹之用了，这次，一颗黄花的M&M豆终于为同胞报了一箭之仇。他变的巨大无比，人类的高楼大厦在他眼里不过是一个个小火柴盒，他跺一跺脚，整座城市都颤抖了。

简介：Fossildiatomgroupsfrom85samplesofdrillholesand13samplesoftheknowndepositionalenvironmentareanalysed.TheboundaryoftheZhujiangDeltaisdiscussedfromthedistributionoffossildiatom.ThehorizonalvariationofHolocenesedimentaryfaciescanbedividedintofourkindsofdepositionalenvironmentcorrespondingtothedeltaplainsubfaciesandthedeltafrontsubfacies.TheverticalvariationofHolocenedepositionalfaciesshowstwicechangesoftransgressionfromweaktovigorous.

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简介：Thepotentialforharvestingenergyfromaflexibledeltawingusingapiezoelectricbimorphisexperimentallyinvestigated.Differentconfigurationsoftheproposedharvestingsystemweretestedinawindtunneloverabroadrangeofairspeeds.Inadditiontoevaluatingthelevelofharvestedpower,ananalysisisperformedtoextractcriticalaspectsfortherelationbetweenspeed,flexibility,geometryandthepotentialpowerthatcanbeharvestedfromaclamped,cantileveredflexibledeltawingatlowanglesofattackandlowspeeds.Thisanalysisprovidesaninsightintoparametersthatimpactenergyharvestingfromflexiblemembranesorelements.

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简介：Throughoneandhalfyearcontinuousin-situmeasurements,thedistributionsandvariationsofsurfaceozoneanditsprecursorsatatypicalmixedagriculturalandmetropolitanarea-Changshu,YangtzeDeltaregion,werestudied.Thepreliminaryanalysisontheconcentrationlevelsandvariationsofsurfaceozoneindicatedtheobviousseasonalanddiurnalcyclesduringtheexperiment.Thehourlyaveragedconcentrationsofsurfaceozonewerehigh,inabout17%oftotalvalidhoursthesurfaceozoneconcentrationexceeded50ppb,andin22daysthehourlyaveragedozoneconcentrationwasgreaterthan100ppb.Therewereabout40%ofthedaysinthatthedailymaximum8-hourozoneconcentrationwasgreaterthan50ppb.Thedayswithdailymaximum8-hourozoneconcentrationgreaterthan80ppbwereabout33daysthataccountedforabout8%oftheobservationaldays.Thevariationsof5-daymovingaveragedozoneconcentrationsdependedbothontheweatherconditionsandonthechangesofozoneinbackgroundatmosphere.Photochemicalprocesshadthesignificantimpactsonozoneproductions.

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。

简介：Thepoleassignmentinaspecifieddiskbystatefeedbackforuncertaindelta-operatorsystemsisstudied.BymakinguseofalgebraRiccatiequations,asufficientandnecessaryconditionofpoleassignmentforakindofparameteruncertaindelta-operatorsysteminaspecifieddiskbystatefeedbackispresented.Andthedesignmethodofstatefeedbackcontrollerisalsodeveloped.Theproposedmethodcanunifysomepreviousrelatedresultsofcontinuousanddiscretetimesystemsintothedeltaframework.Theefficiencyofthedesignmethodisillustratedbyanumericalexample.

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简介：为了在Selenga河三角洲并且到监视器的生态系统估计今日的污染层次，变化由家庭的分泌物引起了拒绝并且工业废物，以及工作农业并且股票农场在里面

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简介：ＯＮＥＮＶＩＲＯＮＭＥＮＴＡＬＣＯＮＤＩＴＩＯＮＳＯＦＴＨＥＧＥＮＥＳＩＳＯＦＴＯＲＮＡＤＯＩＮＴＨＥＺＨＵＪＩＡＮＧＲＩＶＥＲＤＥＬＴＡＩＮＳＰＲＩＮＧ￥ＷａｎｇＰｅｉｌｉｎ王沛霖（ＤｅｐａｒｔｍｅｎｔｏｆＡｔｍｏｓｐｈｅｒｉｃＳｃｉｅｎｃｅｓ，Ｚ...

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