LEADER 01665nam  2200469I  450 
001 9910705877403321
005 20170725143550.0
035   $a(CKB)5470000002453640
035   $a(OCoLC)994295750
035   $a(EXLCZ)995470000002453640
100   $a20170724j199803    ua             0
101 0 $aeng
135   $aurbn|||||||||
181   $ctxt$2rdacontent
182   $cc$2rdamedia
183   $acr$2rdacarrier
200 10$aPreconditioning the Helmholtz equation for rigid ducts /$fKenneth J. Baumeister, Kevin L. Kreider
210  1$aCleveland, Ohio :$cNational Aeronautics and Space Administration, Lewis Research Center,$dMarch 1998.
215   $a1 online resource (18 pages) $cillustrations
225 1 $aNASA technical memorandum ;$v107349
300   $a"March 1998."
300   $a"Performing organization: National Aeronautics and Space Administration, Lewis Research Center"--Report documentation page.
320   $aIncludes bibliographical references (pages 5-6).
606   $aAcoustic propagation$2nasat
606   $aDucts$2nasat
606   $aHelmholtz equations$2nasat
606   $aFinite difference theory$2nasat
606   $aPreconditioning$2nasat
615  7$aAcoustic propagation.
615  7$aDucts.
615  7$aHelmholtz equations.
615  7$aFinite difference theory.
615  7$aPreconditioning.
700   $aBaumeister$b Kenneth J.$01400246
702   $aKreider$b Kevin L.
712 02$aLewis Research Center,
801  0$bGPO
801  1$bGPO
906   $aBOOK
912   $a9910705877403321
996   $aPreconditioning the Helmholtz equation for rigid ducts$93485381
997   $aUNINA