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There are a total of 1753 record(s) matching your query.
Sorted by: NASA Center in Ascending order
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Identification and measurement of combustion noise from a turbofan engine using correlation and coherence techniques
Author(s): Karchmer, A. M.
Abstract: Fluctuating pressure measurements within the combustor and tailpipe of a turbofan engine are made simultaneously with far field acoustic measurements. The pressure measurements within the engine are accomplished with cooled ...
NASA Center: Glenn Research Center
Publication Year: 1977
Added to NTRS: 2004-11-03
Accession Number: 77N33162; Document ID: 19770026218; Report Number: E-9319, NASA-TM-73747
The cyclic stress-strain behavior of a single crystal nickel-base superalloy
Author(s): Gabb, Timothy P.
Abstract: The cyclic stress-strain response and similar deformation structures of the single crystal nickel based superalloy was described under a specific set of conditions. The isothermal low cycle fatigue response and deformation ...
NASA Center: Glenn Research Center
Publication Year: 1988
Added to NTRS: 2005-10-13
Accession Number: 88N19610; Document ID: 19880010226; Report Number: E-3775, NAS 1.15:100269, NASA-TM-100269
Generation of capillary instabilities by external disturbances in a liquid jet
Author(s): Leib, S. J.
Abstract: The receptivity problem in a circular liquid jet is considered. A time harmonic axial pressure gradient is imposed on the steady, parallel flow of a jet of liquid emerging from a circular duct. Using a technique developed in ...
NASA Center: Glenn Research Center
Publication Year: 1985
Added to NTRS: 2005-08-25
Accession Number: 85N30246; Document ID: 19850021934; Report Number: E-2503, NAS 1.15:87041, NASA-TM-87041
Nitridation of silicon
Author(s): Shaw, N. J.
Abstract: Silicon powders with three levels of impurities, principally Fe, were sintered in He or H2. Non-densifying mechanisms of material transport were dominant in all cases. High purity Si showed coarsening in He while particle ...
NASA Center: Glenn Research Center
Publication Year: 1981
Added to NTRS: 2004-11-03
Accession Number: 82N15197; Document ID: 19820007324; Report Number: E-921, NASA-TM-82722
Theoretical model applicable to the experimental determination of surface anchoring energies of nematic liquid crystals
Author(s): Wintucky, E. G.
Abstract: For a cell configuration consisting of a thin nematic layer bounded by two parallel plane surfaces, with opposing surfaces suitably treated to produce dissimilar molecular orientations, the elastic continuum theory for ...
NASA Center: Glenn Research Center
Publication Year: 1980
Added to NTRS: 2004-11-03
Accession Number: 81N12817; Document ID: 19810004306; Report Number: E-637, NASA-TM-81628
An application of queueing theory to the design of channel requirements for special purpose communications satellites
Author(s): Hein, G. F.
Abstract: Special purpose satellites are very cost sensitive to the number of broadcast channels, usually will have Poisson arrivals, fairly low utilization (less than 35), and a very high availability requirement. To solve the ...
NASA Center: Glenn Research Center
Publication Year: 1974
Added to NTRS: 2004-11-03
Accession Number: 74N30533; Document ID: 19740022420; Report Number: NASA-TM-X-71590
X ray attenuation measurements for high-temperature materials characterization and in-situ monitoring of damage accumulation
Author(s): Baaklini, George Y.
Abstract: The scope of this dissertation is to develop and apply x ray attenuation measurement systems that are capable of: (1) characterizing density variations in high-temperature materials, e.g., monolithic ceramics, ceramic and ...
NASA Center: Glenn Research Center
Publication Year: 1992
Added to NTRS: 2005-08-25
Accession Number: 92N25996; Document ID: 19920016753; Report Number: E-6652, NAS 1.15:105577, NASA-TM-105577
An exponential finite difference technique for solving partial differential equations
Author(s): Handschuh, Robert F.
Abstract: An exponential finite difference algorithm, as first presented by Bhattacharya for one-dimensianal steady-state, heat conduction in Cartesian coordinates, has been extended. The finite difference algorithm developed was used ...
NASA Center: Glenn Research Center
Publication Year: 1987
Added to NTRS: 2005-10-13
Accession Number: 87N24930; Document ID: 19870015497; Report Number: AD-A183901, AVSCOM-TR-87-C-19, E-3544, NAS 1.15:89874, NASA-TM-89874
The tribological behavior of polyphenyl ether and polyphenyl thioether aromatic lubricants
Author(s): Jones, William R., Jr.
Abstract: The tribological behavior of several polyphenyl ethers and polyphenyl thioethers is reported. Tribological areas covered include: surface tension and wettability measurements, boundary lubrication, ferrography, thermal and ...
NASA Center: Glenn Research Center
Publication Year: 1987
Added to NTRS: 2005-10-13
Accession Number: 87N26231; Document ID: 19870016798; Report Number: E-3424, NAS 1.15:100166, NASA-TM-100166
Analytical core loss calculations for magnetic materials used in high frequency high power converter applications
Author(s): Triner, J. E.
Abstract: The basic magnetic properties under various operating conditions encountered in the state-of-the-art DC-AC/DC converters are examined. Using a novel core excitation circuit, the basic B-H and loss characteristics of various ...
NASA Center: Glenn Research Center
Publication Year: 1979
Added to NTRS: 2007-10-23
Accession Number: 79N31499; Document ID: 19790023328; Report Number: E-9993, NASA-TM-79234
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