01822oam 2200589 450 991071667690332120210702102327.0(CKB)5470000002523394(OCoLC)24267142(OCoLC)761390732(EXLCZ)99547000000252339419910821j197305 ua 0engur|||||||||||txtrdacontentcrdamediacrrdacarrierMeasured and calculated transmission losses of sound waves through a helium layer /by Thomas D. NorumWashington, D.C. :National Aeronautics and Space Administration,May 1973.1 online resource (23 pages) illustrationsNASA/TN ;D-7230"May 1973."Includes bibliographical references (page 14).HeliumnasatJet nozzlesnasatSound-wavesAcoustic impedanceMaterialsTestingHeliumfastJet nozzlesNoisefastSound-wavesfastHelium.Jet nozzles.Sound-waves.Acoustic impedanceMaterialsTesting.Helium.Jet nozzlesNoise.Sound-waves.Norum Thomas D.1391071United States.National Aeronautics and Space Administration,Langley Research Center.ABCABCAD#OCLCEOCLCQOCLCOOCLCQOCLCFGPOBOOK9910716676903321Measured and calculated transmission losses of sound waves through a helium layer3480159UNINA