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There are a total of 249 record(s) matching your query.
Sorted by: Date Added To NTRS in Descending order
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Influence of Alumina Reaction Tube Impurities on the Oxidation of Chemically-Vapor-Deposited Silicon Carbide
Author(s): Opila, Elizabeth
Abstract: Pure coupons of chemically vapor deposited (CVD) SiC were oxidized for 100 h in dry flowing oxygen at 1300 C. The oxidation kinetics were monitored using thermogravimetry (TGA). The experiments were first performed using ...
NASA Center: Glenn Research Center
Publication Year: 1995
Added to NTRS: 2004-11-03
Accession Number: 97N11553; Document ID: 19970001782; Report Number: NAS 1.15:111738, NASA-TM-111738
Application of the boundary element method to the micromechanical analysis of composite materials
Author(s): Goldberg, R. K.; Hopkins, D. A.
Abstract: A new boundary element formulation for the micromechanical analysis of composite materials is presented in this study. A unique feature of the formulation is the use of circular shape functions to convert the two-dimensional ...
NASA Center: Glenn Research Center
Publication Year: 1995
Added to NTRS: 2004-11-03
Accession Number: 96N22525; Document ID: 19960016917; Report Number: NAS 1.15:111230, NASA-TM-111230
Effect of Tilt Angle on the Morphology of SiC Epitaxial Films Grown on Vicinal (0001) SiC Substrates
Author(s): Powell, J. A.; Larkin, D. J.; Abel, P. B.; Zhou, L.; Pirouz, P.
Abstract: In this study of 4H-SiC and 6H-SiC epitaxial films we found that film morphology was strongly dependent on the tilt angle of the substrate. Large surface steps (up to 25 nm high) due to step bunching were more prevalent at ...
NASA Center: Glenn Research Center
Publication Year: 1996
Added to NTRS: 2004-11-03
Accession Number: 97N21979; Document ID: 19970020726; Report Number: NAS 1.15:112470, NASA-TM-112470
SiC (SCS-6) Fiber Reinforced-Reaction Formed SiC Matrix Composites: Microstructure and Interfacial Properties
Author(s): Singh, M.; Dickerson, R. M.; Olmstead, Forrest A.; Eldridge, J. I.
Abstract: Microstructural and interfacial characterization of unidirectional SiC (SCS-6) fiber reinforced-reaction formed SiC (RFSC) composites has been carried out. Silicon-1.7 at. molybdenum alloy was used as the melt infiltrant, ...
NASA Center: Glenn Research Center
Publication Year: 1997
Added to NTRS: 2004-11-03
Accession Number: 97N22581; Document ID: 19970021683; Report Number: NAS 1.26:204815, NASA-CR-204815
Dendritic Growth Velocities in Microgravity
Author(s): Glicksman, M. E.; Koss, M. B.; Winsa, E. A.
Abstract: We measured dendritic tip velocities in pure succinonitrile (SCN) in microgravity. using a sequence of telemetered binary images sent to Earth from the Space Shuttle Columbia (STS-62). Growth velocities were measured as a ...
NASA Center: Glenn Research Center
Publication Year: 1994
Added to NTRS: 2004-11-03
Accession Number: 97N70265; Document ID: 19970003809; Report Number: E-9554, NAS 1.15:112086, NASA-TM-112086
Survey of Experimental Results From One Year of PASP PLUS Orbital Operation
Author(s): Guidice, D. A.; Curtis, H. B.; Piszczor, M. F.; Palys, J. R.
Abstract: With PASP Plus as its primary payload, the APEX satellite was launched by a standard Pegasus rocket released from a NASA B-52 aircraft on 3 August 1994. A 70 deg inclination, 363 km X 2550 km orbit was achieved, allowing ...
NASA Center: Glenn Research Center
Publication Year: 1996
Added to NTRS: 2004-11-03
Accession Number: 97N20522; Document ID: 19970018584; Report Number: AD-A318286, PL-TR-96-2286
The Applicability of Jet-Shear-Layer Mixing and Effervescent Atomization for Low-NO(x) Combustors
Author(s): Colantonio, R. O.
Abstract: An investigation has been conducted to develop appropriate technologies for a low-NO(x), liquid-fueled combustor. The combustor incorporates an effervescent atomizer used to inject fuel into a premixing duct. Only a fraction ...
NASA Center: Glenn Research Center
Publication Year: 1998
Added to NTRS: 2004-11-03
Document ID: 19990079372
Rigorous Justification of the Localized Approximation to the Beam-Shape Coefficients in Generalized Lorenz-Mie Theory
Author(s): Lock, James A.; Gouesbet, Gerard
Abstract: Generalized Lorenz-Mie theory describes electromagnetic scattering of an arbitrary light beam by a spherical particle. The computationally most expensive feature of the theory is the evaluation of the beam-shape ...
NASA Center: Glenn Research Center
Publication Year: 1994
Added to NTRS: 2004-11-03
Accession Number: 97N72213; Document ID: 19970023765; Report Number: NAS 1.26:204825, NASA-CR-204825
Probabilistic Composite Design
Author(s): Chamis, Christos C.
Abstract: Probabilistic composite design is described in terms of a computational simulation. This simulation tracks probabilistically the composite design evolution from constituent materials, fabrication process, through composite ...
NASA Center: Glenn Research Center
Publication Year: 1997
Added to NTRS: 2004-11-03
Document ID: 19990018403; Report Number: STP-1242
TEM Study of Precipitation in a NiAl-3Ti-0.5Hf Single-Crystal Alloy
Author(s): Garg, A.; Noebe, R. D.; Howe, J. M.; Wilson, A. W.; Levit, V.
Abstract: Samples for transmission electron microscopy (TEM) were prepared from 3 mm diameter cylinders electro-discharge machined from the heat-treated ingots. Slices sectioned from the cylinders were mechanically ground and ...
NASA Center: Glenn Research Center
Publication Year: 1996
Added to NTRS: 2004-11-03
Accession Number: 97N23210; Document ID: 19970022760; Report Number: NAS 1.15:112761, NASA-TM-112761
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