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  • 简介:Watershedmanagementisanever-evolvingpracticeinvolvingthemanagementofland,water,biota,andotherresourcesinadefinedareaforecological,social,andeconomicpurposes.Inthispaper,weexplorethefollowingquestions:Howhaswatershedmanagementevolved?Whatnewtoolsareavailableandhowcantheybeintegratedintosustainablewatershedmanagement?Toaddressthesequestions,wediscusstheprocessofdevelopingintegratedwatershedmanagementstrategiesforsustainablemanagementthroughtheincorporationofadaptivemanagementtechniquesandtraditionalecologicalknowledge.Weaddressthenumerousbenefitsfromintegrationacrossdisciplinesandjurisdictionalboundaries,aswellastheincorporationoftechnologicaladvancements,suchasremotesensing,GIS,bigdata,andmulti-levelsocial-ecologicalsystemsanalysis,intowatershedmanagementstrategies.WeusethreecasestudiesfromChina,Europe,andCanadatoreviewthesuccessandfailureofintegratedwatershedmanagementinaddressingdifferentecological,social,andeconomicdilemmasingeographicallydiverselocations.Althoughprogresshasbeenmadeinwatershedmanagementstrategies,therearestillnumerousissuesimpedingsuccessfulmanagementoutcomes;manyofwhichcanberemediedthroughholisticmanagementapproaches,incorporationofcutting-edgescienceandtechnology,andcross-jurisdictionalcoordination.Weconcludebyhighlightingthatfuturewatershedmanagementwillneedtoaccountforclimatechangeimpactsbyemployingtechnologicaladvancementsandholistic,cross-disciplinaryapproachestoensurewatershedscontinuetoservetheirecological,social,andeconomicfunctions.Wepresentthreecasestudiesinthispaperasavaluableresourceforscientists,resourcemanagers,governmentagencies,andotherstakeholdersaimingtoimproveintegratedwatershedmanagementstrategiesandmoreefficientlyandsuccessfullyachieveecologicalandsocio-economicmanagementobjectives.

  • 标签: 流域综合管理 地理信息系统 社会生态 流域管理 经济功能 演变
  • 简介:Wedemonstratetheuseofstochasticcollocationtoassesstheperformanceofphotonicdevicesundertheeffectofuncertainty.Thisapproachcombineshighaccuracyandefficiencyinanalyzingdevicevariabilitywiththeeaseofimplementationofsampling-basedmethods.Itsflexibilitymakesitsuitabletobeappliedtoalargerangeofphotonicdevices.WecomparethestochasticcollocationmethodwithaMonteCarlotechniqueonanumericalanalysisofthevariabilityinsilicondirectionalcouplers.

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  • 简介:Wepresentintegrated-opticbuildingblocksandfunctionalphotonicdevicesbasedonamorphoussiliconon-insulatortechnology.Efficientdeep-etchedfiber-to-chipgratingcouplers,low-losssingle-modephotonicwirewaveguides,andcompactpowersplittersarepresented.Basedonthesub-μmphotonicwires,2×2Mach–Zehnderinterferometersandadd/dropmicroringresonators(MRRs)withlowdevicefootprintsandhighfinesseupto200wererealizedandstudied.Compactpolarizationrotatorsandsplitterswith≥10dBpolarizationextinctionratiowerefabricatedforthepolarizationmanagementon-chip.Thetuningandtrimmingcapabilitiesofthematerialplatformaredemonstratedwithefficientmicroheatersandapermanentdevicetrimmingmethod,whichenabledtherealizationofenergy-efficientphotoniccircuits.Wavelengthmultiplexersintheformofcascadedfilterbanksand4×4routersbasedonMRRswitchesarepresented.Fabricationimperfectionswereanalyzedandpermanentlycorrectedbyanaccuratelaser-trimmingmethod,thusenablingeight-channelmultiplexerswithrecordlowmetricsofsub-mWstaticpowerconsumptionand≤1°Ctemperatureoverhead.Thehighqualityofthefunctionaldevices,thehightuningefficiency,andtheexcellenttrimmingcapabilitiesdemonstratethepotentialtorealizelow-cost,denselyintegrated,andultralow-power3D-stackedphotoniccircuitsontopofCMOSmicroelectronics.

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  • 简介:Howtodealwiththecollaborationbetweentaskdecompositionandtaskschedulingisthekeyproblemoftheintegratedmanufacturingsystemforcomplexproducts.Withthedevelopmentofmanufacturingtechnology,wecanprobeanewwaytosolvethisproblem.Firstly,anewmethodfortaskgranularityquantitativeanalysisisputforward,whichcanpreciselyevaluatethetaskgranularityofcomplexproductcooperationworkflowintheintegratedmanufacturingsystem,ontheabovebasis;thismethodisusedtoguidethecoarse-grainedtaskdecompositionandrecombinethesubtaskswithlowcohesioncoefficient.Then,amulti-objectiveoptimieationmodelandanalgorithmaresetupfortheschedulingoptimizationoftaskscheduling.Finally,theapplicationfeasibilityofthemodelandalgorithmisultimatelyvalidatedthroughanapplicationcasestudy.

  • 标签: 集成制造系统 任务分解 调度优化 任务分配 复杂产品 任务调度
  • 简介:StationarylongpulseplasmaofhighelectrontemperaturewasproducedonEASTforthefirsttimethroughanintegratedcontrolofplasmashape,divertorheatflux,particleexhaust,wallconditioning,impuritymanagement,andthecouplingofmultipleheatingandcurrentdrivepower.Adischargewithalowersinglenulldivertorconfigurationwasmaintainedfor103sataplasmacurrentof0.4MA,q95≈7.0,apeakelectrontemperatureof>4.5keV,andacentraldensityne(0)2.5×1019m-3.Theplasmacurrentwasnearlynon-inductive(Vloop<0.05V,poloidalbeta0.9)drivenbyacombinationof0.6MWlowerhybridwaveat2.45GHz,1.4MWlowerhybridwaveat4.6GHz,0.5MWelectroncyclotronheatingat140GHz,and0.4MWmodulatedneutraldeuteriumbeaminjectedat60kV.Thisprogressdemonstratedstrongsynergyofelectroncyclotronandlowerhybridelectronheating,currentdrive,andenergyconfinementofstationaryplasmaonEAST.Itfurtherintroducedanexampleofintegrated'hybrid'operatingscenarioofinteresttoITERandCFETR.

  • 标签: 电子温度 集成控制 脉冲等离子体 电子回旋加热 等离子体电流 场景
  • 简介:在有一个cogeneration系统的一个综合熨斗和钢植物,再循环精力连续地被搬运进cogeneration系统和电连续地被产生,并且他们俩不能很长时间被存储。而且,电的产生和消费是不规则的,它可以引起更意外的不平衡。因此,由优化精力利用的操作安排全部精力系统是一个关键问题,它在这二个系统在生产系统,在cogeneration系统的产生电和再循环的精力包括未加工的精力。在这份报纸,为在有一个cogeneration系统的综合的铁和钢植物的精力优化的一个改进线性编程模型被建立。改进模型集中于控制整个精力流动并且通过与一个cogeneration系统在一个综合熨斗和钢植物优化各种精力分发和利用在在生产系统之间的全部精力系统和cogeneration系统安排整个精力消费。改进模型在更高的精力利用,更低的精力费用和更低的污染排出物为最佳的操作条件提供的案例研究表演。

  • 标签: 热电联产系统 能源优化 LP模型 钢铁厂 能源利用率 中国
  • 简介:OpticalsimulationsofGaAs/AlGaAsthin-filmwaveguideswereperformedforinvestigatingthedependenceofthemodalbehavioronwaveguidegeometryandtheresultinganalyticalsensitivity.Simulationswereperformedfortwodistinctmid-infraredwavelengths,therebydemonstratingthenecessityofindividuallydesignedwaveguidestructuresforeachspectralregimeofinterest.Hence,themodalbehavior,sensitivity,andintensityoftheevanescentfieldwereinvestigatedviamodelingstudiesat1600and1000cm-1,therebyconfirmingtheutilityofsuchsimulationsfordesigningmid-infraredsensorsbasedonthin-filmwaveguidetechnology.

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  • 简介:WedescribeandexperimentallydemonstrateameasuringtechniqueforMach–Zehnderinterferometer(MZI)basedintegratedphotonicbiochemicalsensors.OurtechniqueisbasedonthedirectmeasurementofphasechangesbetweenthearmsoftheMZI,achievedbysignalmodulationononeofthearmsoftheinterferometertogetherwithpseudoheterodynedetection,anditallowsustoavoidtheuseofcostlyequipmentsuchastunablelightsourcesorspectrumanalyzers.Theobtainedoutputsignalisintrinsicallyindependentofwavelength,powervariations,andglobalthermalvariations,makingitextremelyrobustandadequateforuseinrealconditions.Usingasilicon-on-insulatorMZI,wedemonstratethereal-timemonitoringofrefractiveindexvariationsandachieveadetectionlimitof4.1×10-6refractiveindexunits(RIU).

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