6 Labstracts November 26, 2012 November 26, 2012 Labstracts 7
recognizebothherscientificachievementsandherciviccontributions.Anelementaryschoolinthecityisalsonamedafterher,whichisparticularlyappropriate,asDr.GebbierecallsthatAuntKatharinealwaysentrancedherandherplaymateswiththesuitcaseofexperimentssheusedtobringtothehouse—shewouldshowthechildrenhowtomakedifferentcolorsbydippingglassrodsintofilmsofoilfloatingonwater.
Dr.Gebbiewasnotonlyinspiredbyhernamesakeaunt,butshealsofollowedinherfootsteps—asdidDr.Gebbie’smotherandanotheraunt—byattendingBrynMawrCollege.(Dr.Gebbiewrylyrelatedthatonher15thbirthday,hergrandmotherfirstcongratulatedherforturning15,andthenpointedoutthatherAuntKatharine
Women in Science and Engineering (WISE)
NRL-WISE hosts physicist Dr. Katharine Gebbie(Continuedfrompage4.)
was already entering Bryn Mawr at age 15….)Dr.Gebbiemajoredinphysics,asheraunthad,andwasoneofonlythreestudentswiththatmajorintheclassof1957.ShewentontostudyastronomyandearnedherPh.D.inphysicsfromUniversityCollegeLondon.In1991,afteralongcareerattheJointInstituteforLaboratoryAstrophysicsinBoulder,Colorado,shebecamechiefofNIST’snewPhysicsLaboratory,nowcalledthePhysicalMeasurementLaboratory.InherroleatNIST,Dr.Gebbiehasbeencalled“fearlessandcommittedtoexcellence.”Sheisalsocalled“high-flying”—inpart,becausesheisapilot;shehasflownhermother’ssmallplaneallaroundNorthAmerica.
Dr.GebbieacknowledgedthatherAuntKatharinewasarolemodeltoher,butthatshe
didnotrealizeituntilshewasolder.Itneveroccurredtohertoaskherauntwhatitwasliketobeaprominentwomanscientist—afterall,didn’teveryonehaveauntswhoweredistinguishedphysicists?ToDr.Gebbie,shewasherfunandentertainingAuntKatharinewhoalwayshadasuitcase,andamind,fullofwonderstoshare.
NRL’sWISEchapterhostslectures,round-tablemeetings,andothereventsthroughouttheyear,andalsoco-hostswithSigmaXiaPostdocPosterSession.EventsareopentotheentireNRLcommunity.Formoreinformation,contactWISEpresidentDr. Arati Dasgupta at (202) 404-4389.
~ George J. Linde ~1941 - 2012
In memoriam
George J. Linde,along-timememberoftheRadarDivision,diedJanuary17,afteralongillness,whichhebattledcourageously.HisfamilyenduredtheNazioccupationandthenfledtoGermanywhentheSovietArmyinvadedin1944.DuringthedifficultyearsafterWWII,thefamilywassenttoaDisplacedPersonscampinAugsburg,Germany,whereGeorgeattendedelementaryschool.In1950,thecampswereclosedandtheresidentswereresettledintocommunitiesallovertheworld.TheLindefamilyfoundsponsorshiptosettleinHutchinson,Minn.
Aftershowinganearlyinterestinengineering,GeorgeattendedtheInstituteofTechnologyattheUniversityofMinnesotawherehereceivedaBSEEwithDistinctionin1965.HeworkedforoneyearattheIBMCorporationatRochester,Minn.,beforejoiningtheRadarDivisionatNRLin1966.
WhileatNRL,heearnedaMSEEfromtheUniversityofMarylandin1971.
Georgemadecontributionstomanysignificantradarprojectsoverhis41yearswiththeRadarDivision.EarlyonhebecametheprincipalinvestigatorfortheexperimentalReflect-ArrayRadarusedtovalidatenewconceptswhichultimatelyledtothespecificationsfortheAegisSPY-1radar.HewasalsoamemberoftheteamthatdevelopedanddemonstratedanewLowProbabilityofInterceptradarsystem.
HehelpeddesignanddemonstrateradarconceptsforthesecurelandingofaircraftaboardNavycarriersandwastheprincipalinvestigatorforaprojecttodevelopanddemonstrateECCMtechniquesforNavyradars.HewasprincipalinvestigatorforthedevelopmentanddemonstrationofaSurfaceSearchImage-While-ScanradarforcontinuoussurfacesurveillanceandISARimagingof targets of interest.
AlargepartofGeorge’scareeratNRLinthe 1980s was devoted to his assignment as the principalinvestigatorfortheSENRADradarbeinginstalledatNRL’sChesapeakeBayDetachment(CBD).SENRADwasarevolutionarynewradarconceptforfutureair-surveillanceradars,developedatNRLwithindustrysupport.Thisradarfeaturedaverywidebandwidthof850-1400MHz,whichmadetheradarresistanttoenemyjamming,allowedthe use of wideband waveforms for target imaging andclassification,reducedmultipatheffectsoverwater,andmadeitpossibletoimplementanoveltypeofheightfinding.AftertheworkonSENRADbecamedeclassified,adetailedpaperonitsdesignandperformancecharacteristicswaspublishedin2001 in the IEEE Transactions on Aerospace and Electronic Systemsinapaperco-authoredwithDr. Merrill Skolnik and Keith Meads.
In1995GeorgebecamethesystemsengineerandprincipaldesignerfortheWARLOCradar,theworld’shighestpower94GHzradar,latertobesitedatCBD.TheGyro-Klystrontubefortheradar,whichprovidesmorethan80kWofpeakpowerand10kWofaveragepower,wasdevelopedinajointprogramwiththeNRLElectronicScienceandTechnologyDivision.Hiscontributionsincludedtheoverallradardesign,thesystemintegrationintotwotrailers,andyearsofresearchinmanyareas
George J. Linde.
ofmillimeter-waveradarphenomenology.Thisresearchincludedpropagationeffects,seaclutterreflectivity,inversesyntheticapertureimaging,andthediscoveryofanewphenomenon,whichhenamed“airspikes,”thoughttobecausedbyintensepocketsofrefractiveindexfluctuation.HisworkonWARLOCresultedintheRadarDivisionofNRLacquiringaworld-classcapabilityinthetechnologyandphenomenologyofmillimeterradar.
GeorgeretiredfromNRLin2007butcontinued
hisassociationwiththeRadarDivisionworkingparttime,initiallyasare-employedannuitantandlaterasacontractor.
Athisretirementluncheon,aletterwasreadfromDr.MerrillSkolnik,formerSuperintendantoftheNRLRadarDivision.Thefollowingquotesfromthisletterspeakforthemselves:
“There are many different kinds of radar engineers–fromthosewhophilosophizeaboutradartothosewhobuildit,operateitormaintainit(usuallyalldifferentpeople)andallthoseinbetween.ButIconsideryoutobetheclassicalkindofrealradarengineerwhocreatesanewtypeofsystemthatneverexistedbefore.”
“…Youaretrulywhataradarengineershouldbe:onewhocanstartwithjustanideaandcreatesomethingimportantthatdidn’tpreviouslyexist,
thenutilizethisradartounderstandwhatitcando,andthentoconveythisknowledgetoothers.”
OvertheyearsGeorgereceivedfourAlanBermanResearchPublicationAwards,theNRLAwardofMeritforGroupAchievementfortheHighPowerW-bandGyro-KlystronAmplifierandWARLOCRadarDevelopment,andtheNRLTechnologyTransferAward.Heauthoredorco-authored32publishedpapersand21NRLreports.
In addition to his workinthefieldofradar George devoted muchofhissparetimetosomeuniqueand interesting hobbies. He was a master woodworker and built many piecesoffurniture,as well as elaborate computer-designedbowls,usingwoodfromacherrytreeinhis yard that hecutandseasoned.
Hehadanavidinterestinastrophotographyandspentmanynighthours,usuallyinthecoldwintermonths,photographingthenightskyfromanobservatoryhebuiltonhisproperty.Hehadaparticularinterestinthephotographyofnebulasandgalaxieswhereexposuretimesofhoursareoftenrequired.ThesephotographsgracethewallsofhishomeandwereusedonChristmascardssentto friends and relatives. He was an avid runner all his life and traveled to witness a number of world classtrackeventsincludingthe1972Olympics.GeorgealsohadbeenPresidentofOurSavior’sLutheranChurchatBryansRoad,MD,wherehewas intimately involved in the day-to-day affairs.
GeorgeandBeverly,hiswifeof46years,greatlyenjoyedtravelingintheUnitedStates,aswellastoCanadaandEurope.Hispreferredmethodoftravelwasalwaysbycar,andheinsistedthateveryonemusttravelcoast-to-coastbycaratleastonceinalifetime.TogetherGeorgeandBeverly did it a number of times. George and BeverlyalsoownedalargemotoryachtnamedImpatience,whichtheyusedtocruisealongthePotomacandtheChesapeakeBayonweekendsandvacations.
GeorgewillbesorelymissedbyhiscolleaguesatNRL,notonlyforhistechnicalexpertise,butforhis dry Minnesotan humor and unassuming manner. His was a life well lived.
Dr. Terry C. Hazen,UT/ORNLGovernor’sChairProfessor,willbetheguestspeakerattheCenterforBiomolecularScienceandEngineeringcolloquiumonThursday, December 13,at10a.m.,inBuilding30,Room228(mainconferenceroom).Histalkisentitled“TheDeepwaterHorizonOilSpill:ASystemsBiologyApproachtoanEcologicalDisaster.”
ABSTRACT—TheexplosiononApril20,2010atDeepwaterHorizondrillingrigintheGulfofMexicoresultedinoilandgasrisingtothesurfaceandtheoilcomingashoreinmanypartsoftheGulf,andinthedispersmentofanoilplume4,000feetbelowthesurfaceofthewater.Despitespanningmorethan600feetinthewatercolumnandextendingmorethan10milesfromthe
Center for Biomolecular Science and Engineering colloquium
wellhead,thedispersedoilplumewasgonewithinweeksafterthewellheadwascapped–degradedanddilutedtoundetectablelevels.Furthermore,thisdegradationtookplacewithoutsignificantoxygendepletion.Ecogenomicsenabledthediscoveryofnewandunclassifiedspeciesofoil-eatingbacteriathatapparentlyliveinthedeepGulfwhereoilseepsarecommon.Theresultsprovideinformationaboutthekeyplayersandprocessesinvolvedindegradationofoil,withandwithoutCOREXIT,indifferentimpactedenvironmentsintheGulfofMexico.
Formoreinformation,contactDr. Gary J. Vora at (202) 767-0394 or [email protected].
Laboratory for Computational Physics and Fluid Dynamics seminar
Dr. K. Kailasanath, Code6040,willbetheguestspeakerattheLaboratoryforComputationalPhysicsandFluidDynamicsseminaronFriday,December7,at1p.m.,inBuilding97,Room132.Histalkisentitled“DetonationEngineResearchatNRL.”
ABSTRACT—Enginesbasedontheinherenthigherthermodynamicefficiencyofthedetonationcyclehavebeendesirableformanyyears.Theyhavethepotentialtorevolutionizetheenginesusedinpropulsionandpowersystemsofthefuturebysignificantlyreducingthefuelconsumption.NRL has been in the forefront on identifying and
developingthescienceandtechnologybaseforenginesbasedonthedetonationcycle.Thistalkwillprovideanoverviewofthisexcitingfuturetechnology.ThemostdevelopeddetonationengineconceptistheintermittentorPulsed-Detonation-Engine,orPDE.WhilethePDEisattractiveinmanyways,theconceptalsohasmanyissuesthatarecontinuingtoberesolved.AnalternativeconceptthathasreceivedlessattentionistheRotating-Detonation-Engine,orRDE.AnRDEisatypeofcontinuousdetonationwaveenginewhereadetonationisinitiatedonceandthenremainsintactwhiletheengineisrunning.SimilartothePDE,theRDEhastheadvantageofbeingabletooperateunderawiderangeofconditionsand
Machnumbers.WehaveconductedandpublishedextensiveresearchonthePulse-DetonationEngineConcept.Now,weareconductingnumericalsimu-lationsonanidealizedRDEconceptinordertobetterunderstandtheflowfieldandperformancepotentialoftheseengines.Iwillpresentthehigh-lightsofourfundamentalnumericalsimulationbasedstudiesofbothdetonation-engineconceptsandputitinthecontextoftheongoingworld-wideeffortinadvancingthistechnology.
Forfurtherinformation,contactMs. Lisa Williams at (202) 404-1057 or [email protected].
Announcements
~writtenbyRobertCrisler,MaiNgo, and Vilhelm Gregers-Hansen
Combined FederalCampaign (CFC)
