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简介：ObservationoftheoperationoftheSanmenxiaReservoirontheYellowRiverhasledtotheconclusionthattopreserveacertaineffectivestoragevolumeforreservoirsbuiltonheavilysilt-ladenriversisfeasibleifthereservoirisoperatedaccordingtotheprincipleknownas"storingtheclearwateranddischargingthemuddyflow".Therelativestabilityofthebedelevationattheendofthebackwaterandthereservoir'serosionanddepositionequilibriumdependonthecompatibilityofthepoollevelmaintainedinnon-floodseasonswiththeconditionsofflowandsedimentloadduringfloodseasons.OperatingthereservoirtoregulatethefloodandsedimentloadduringfloodseasonscanreducetherateofaggradationintheLowerYellowRiver.Thebasicconditionforapplyingtheoperationmodeof"storingtheclearwateranddischargingthemuddyflow"isthatasufficientamountofwatershouldbeusedfordischargingsedimentduringfloodseasons.Undertheconditionofextremelylowflowyears,reservoirsedimentationcannotbeavoidedevenifthisoperationmodeisadopted.

简介：ThinheavilyMg-dopedInGaNandGaNcompoundcontactlayerisusedtoformNi/AuOhmiccontacttop-GaN.ThegrowthconditionsofthecompoundcontactlayeranditseffectontheperformanceofNi/AuOhmiccontacttop-GaNareinvestigated.Itisconfirmedthatthespecificcontactresistivitycanbelowerednearlytwoordersbyoptimizingthegrowthconditionsofcompoundcontactlayer.WhentheflowrateratiobetweenMgandGagassourcesofp++-InGaNlayeris10.6%andthethicknessofp++-InGaNlayeris3nm,thelowestspecificcontactresistivityof3.98×10-5?·cm2isachieved.Inaddition,theexperimentalresultsindicatethatthespecificcontactresistivitycanbefurtherloweredto1.07×10-7?·cm2byoptimizingthealloyingannealingtemperatureto520℃.