high price increase due to the immobilization of the fuel in the waste fuel nuclear reactor pools.docx
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high price increase due to the immobilization of the fuel in the waste fuel nuclear reactor pools.docx
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highpriceincreaseduetotheimmobilizationofthefuelinthewastefuelnuclearreactorpools
velocity,andcurrentdensity.Mathematicallythemodelformsasystemofdifferential-algebraicequations(DAEs),whichissolvedcomputationally.Themodelisdesignedwithprocess-controlapplicationsinmind,althoughitcancertainlybeappliedmorewidely.Althoughthephysicalmodeliscomputationallyefficient,itisstilltoocostlyforincorporationdirectlyintoreal-timeprocesscontrol.Therefore,system-identificationtechniquesareusedtodevelopreduced-order,locallylinearmodelsthatcanbeincorporateddirectlyintoadvancedcontrolmethodologies,suchasmodelpredictivecontrol(MPC).Thepaperillustratesthephysicalmodelandthereduced-orderlinearstate-spacemodelwithexamples.
ArticleOutline
Nomenclature
1.Introduction
2.Modeldevelopment
2.1.Fuelflow,overallmasscontinuity
2.2.Fuelflow,speciescontinuityequations
2.3.Fuelflow,thermalenergy
2.4.Anodebi-layermodel
2.5.MEAenergybalance
2.6.Cathodeairconservationequations
2.7.Electrochemistry
3.Implementation
4.Examplemodelresults
4.1.Steady-stateresults
4.2.Transientsimulations
5.LinearidentificationoftheSOFCstack
5.1.Subspacesystemidentification
5.2.Illustrationoflinearsystemidentification
6.Conclusion
References
937
Recentadvancesinnuclearpoweredelectricpropulsionforspaceexploration OriginalResearchArticle
EnergyConversionandManagement,Volume49,Issue3,March2008,Pages412-435
R.JosephCassady,RobertH.Frisbee,JamesH.Gilland,MichaelG.Houts,MichaelR.LaPointe,ColleenM.Maresse-Reading,StevenR.Oleson,JamesE.Polk,DerrekRussell,AnitaSengupta
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AbstractAbstract|Figures/TablesFigures/Tables|ReferencesReferences
Abstract
Nuclearandradioisotopepoweredelectricthrustersarebeingdevelopedasprimaryinspacepropulsionsystemsforpotentialfutureroboticandpilotedspacemissions.Possibleapplicationsforhigh-powernuclearelectricpropulsionincludeorbitraisingandmaneuveringoflargespaceplatforms,lunarandMarscargotransport,asteroidrendezvousandsamplereturn,androboticandpilotedplanetarymissions,whilelowerpowerradioisotopeelectricpropulsioncouldsignificantlyenhanceorenablesomefutureroboticdeepspacesciencemissions.ThispaperprovidesanoverviewofrecentUShigh-powerelectricthrusterresearchprograms,describingtheoperatingprinciples,challenges,andstatusofeachtechnology.MissionanalysisispresentedthatcomparesthebenefitsandperformanceofeachthrustertypeforhighpriorityNASAmissions.Thestatusofspacenuclearpowersystemsforhigh-powerelectricpropulsionispresented.Thepaperconcludeswithadiscussionofpowerandthrusterdevelopmentstrategiesforfutureradioisotopeelectricpropulsionsystems.
ArticleOutline
Nomenclature
1.Introduction
2.Electricpropulsionfundamentals
2.1.EPfiguresofmerit
2.2.Categoriesofelectricpropulsion
2.2.1.Electrothermalthrusters
2.2.2.Electrostaticthrusters
2.2.3.Electromagneticthrusters
2.2.4.Advancedthrusterconcepts
3.Nuclearelectricpropulsionsystems
3.1.NEPcomponenttechnologies
3.1.1.Reactor
3.1.2.Powerconversion
3.1.3.Heatrejection
3.1.4.Powermanagementanddistribution
4.Recentadvancesinhigh-powerelectricpropulsion
4.1.IonthrustertechnologydevelopmentfortheJupiterIcyMoonsOrbiterproject
4.1.1.JIMOtechnologychallengesforionpropulsion
4.1.2.JIMOionthrusterdevelopment
4.1.3.Highvoltagepropellantisolatorsandinsulators
4.1.4.Ionenginelifemodelingandtesting
4.1.5.Radiationhardenedmaterialsandcomponents
4.1.6.Griddedionpowerprocessingunits
4.1.7.Propellantmanagement
4.2.VeryhighIspthrusterwithanodelayer(VHITAL)
4.2.1.Systemsengineeringadvantages
4.2.2.VHITALtwo-stagetechnology
4.2.3.VHITALtechnologyassessmentandstatus
4.3.Advancedlithium-fedapplied-fieldLorentzforceaccelerator(ALFA2)
4.3.1.Advantagesoflithium-fedMPDthrusters
4.3.2.ALFA2thrusterdesign
4.3.3.Lithiumvaporizorandfeedsystem
4.3.4.ALFA2vehiclestudy
4.4.Nuclearelectricpulsedinductivethruster(NuPIT)
4.4.1.NuPITexperimentaldevelopment
4.4.2.NuPITmissionanalysis
4.4.3.NuPITnumericalmodeling
5.Nuclearelectricpropulsionmissionsanalysis
6.Statusofnuclearspacepowersystems
7.Radioisotopeelectricpropulsion
7.1.REPpowersystems
7.1.1.DirectdriveEP
7.2.REPmissionbenefits
8.Concludingremarks
Acknowledgements
References
Purchase
$37.95
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Simulationofn-qubitquantumsystems.II.Separabilityandentanglement OriginalResearchArticle
ComputerPhysicsCommunications,Volume175,Issue2,15July2006,Pages145-166
T.Radtke,S.Fritzsche
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Abstract
Studiesontheentanglementofn-qubitquantumsystemshaveattractedalotofinterestduringrecentyears.Despitethecentralroleofentanglementinquantuminformationtheory,however,therearestillanumberofopenproblemsinthetheoreticalcharacterizationofentangledsystemsthatmakesymbolicandnumericalsimulationonn-qubitquantumregistersindispensableforpresent-dayresearch.
Tofacilitatetheinvestigationoftheseparabilityandentanglementpropertiesofn-qubitquantumregisters,herewepresentarevisedversionoftheFeynmanprogramintheframeworkofthecomputeralgebrasystemMaple.InadditiontoallpreviouscapabilitiesofthisMaplecodefordefiningandmanipulatingquantumregisters,theprogramnowprovidesvarioustoolswhicharenecessaryforthequalitativeandquantitativeanalysisofentanglementinn-qubitquantumregisters.Asimpleaccess,inparticular,isgiventoseveralalgebraicseparabilitycriteriaaswellasanumberofentanglementmeasuresandrelatedquantities.Asinthepreviousversion,symbolicandnumericcomputationsareequallysupported.
Programsummary
Titleofprogram:
Feynman
Catalogueidentifier:
ADWE_v2_0
ProgramsummaryURL:
http:
//cpc.cs.qub.ac.uk/summaries/ADWE_v2_0
Programobtainablefrom:
CPCProgramLibrary,Queen'sUniversityofBelfast,N.Ireland
Licensingprovisions:
None
Computersforwhichtheprogramisdesigned:
AllcomputerswithalicenseofthecomputeralgebrasystemMaple[MapleisaregisteredtrademarkofWaterlooMapleInc.]
Operatingsystemsunderwhichtheprogramhasbeentested:
Linux,MSWindowsXP
Programminglanguageused:
Maple10
Typicaltimeandmemoryrequirements:
Mostcommandsactingonquantumregisterswithfiveorlessqubitstake
10secondsofprocessortime(onaPentium4with
2 GHzorequivalent)and5–20MBofmemory.However,storageandtimerequirementscriticallydependonthenumberofqubits,n,inthequantumregistersduetotheexponentialincreaseoftheassociatedHilbertspace.
No.oflinesindistributedprogram,includingtestdata,etc.:
3107
No.ofbytesindistributedprogram,includingtestdata,etc.:
13 859
Distributionformat:
tar.gz
Reasonsfornewversion:
Thefirstprogramversionestablishedthedatastructuresandcommandswhichareneededtobuildandmanipulatequantumregisters.Sincethe(evolutionof)entanglementisacentralaspectinquantuminformationprocessingthecurrentversionaddsthecapabilitytoanalyzeseparabilityandentanglementofquantumregistersbyimplementingalgebraicseparabilitycriteriaandentanglementmeasuresandrelatedquantities.
Doesthisversionsupersedethepreviousversion:
Yes
Natureofthephysicalproblem:
Entanglementhasbeenidentifiedasanessentialresourceinvirtuallyallaspectsofquantuminformationtheory.Therefore,thedetectionandquantificationofentanglementisanecessaryprerequisiteformanyapplications,suchasquantumcomputation,communicationsorquantumcryptography.Uptothepresent,however,themultipartiteentanglementofn-qubitsystemshasremainedlargelyunexploredowingtotheexponentialgrowthofcomplexitywiththenumberofqubitsinvolved.
Methodofsolution:
UsingthecomputeralgebrasystemMaple,asetofprocedureshasbeendevelopedwhichsupportsthedefinitionandmanipulationofn-qubitquantumregistersandquantumlogicgates[T.Radtke,S.Fritzsche,Comput.Phys.Comm.173(2005)91].Theprovidedhierarchyofcommandscanbeusedinteractivelyinordertosimulatethebehaviorofn-qubitquantumsystems(byapplyinganumberofunitaryornon-unitaryoperations)andtoanalyzetheirseparabilityandentanglementproperties.
Restrictionsontothecomplexityoftheproblem:
Thepresentversionoftheprogramfacilitatesthesetupandthemanipulationofquantumregistersbymeansof(predefined)quantumlogicgates;itnowalsoprovidesthetoolsforperformingasymbolicand/ornumericanalysisoftheentanglementforthequantumstatesofsuchregisters.Owingtotherapidincreaseinthecomputationalcomplexityofmulti-qubitsystems,however,thetimeandmemoryrequirementsoftengrowrapidly,especiallyforsymboliccomputations.Thisincreaseofcomplexitylimitstheapplicationoftheprogramtoabout6or7qubitsonastandardsingleprocessor(Pentium4with
2 GHzorequivalent)machinewith
1 GBofmemory.
Unusualfeaturesoftheprogram:
TheFeynmanprogramhasbeendesignedwithintheframeworkofMapleforinteractive(symbolicornumerical)simulationsonn-qubitquantumregisterswithnootherrestrictionthangivenbythememoryandprocessorresourcesofthecomputer.Wheneverpossible,bothrepresentationsofquantumregis
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