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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Mapping of Threading Screw Dislocations in 4H n-Type SiC Wafers
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Relaxed GaP on Si with low threading dislocation density
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Study on dislocation relaxation peaks in gold and copper
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Dislocation structures in slightly strained tungsten and tungsten-rhenium and tungsten-tantalum alloys
Deformation structures of polycrystalline slightly strained tungsten, tungsten rhenium, and tungsten tantalum alloys examined by transmission electron microscopy
Dislocation Structures in Slightly Strained Tungsten, Tungsten-Rhenium, and Tungsten- Tantalum Alloys
Deformation substructures of W, W-Re and W-Ta alloys, using transmission electron microscopy
Dislocation structures in single crystal tungsten and tungsten alloys
Tungsten and tungsten alloy single crystal deformations determined as function of alloying, strain, and temperature
Ultrasonic detection of the pinning of dislocations by point defects in lead. I - Determination of migration energies
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Hysteretic internal friction due to the break-down of attractive dislocation junctions. II - Quantitative development of the model
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Hysteretic internal friction due to the break-down of attractive dislocation junctions. I - Qualitative description of the model
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Dislocation model for aseismic crustal deformation at Hollister, California
A model of crustal deformation during the interseismic phase is developed and applied (using the improved Bayesian inversion algorithm described by Jackson and Matsu'ura, 1985) to trilateration data for the USGS Hollister (CA) network. In the model, rigid blocks in motion relative to each other experience friction only in a brittle upper zone, while their ductile lower zones slide freely; the Hollister model comprises five blocks and nine rectangular fault patches. The data and results are presented in tables, graphs, and maps and characterized in detail. The model predicts steady block motion on time scales between 10 yr and 1 Myr, with net motion across the San Andreas/Calaveras fault system 38 + or - 3 mm/yr and brittle/ductile transition depths ranging from 0.4 to 11 km. Two San Andreas segments with higher probabilities of moderate-to-large earthquakes are identified.
Effect of Threading Dislocations on GaInP Front- and Rear-Junction Solar Cells Grown on Si
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Quantitative treatment of the creep of metals by dislocation and rate-process theories
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Dislocation Theory of the Fatigue of Metals
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Atomic-scale Modeling of the Structure and Dynamics of Dislocations in Complex Alloys at High Temperatures
We report on the progress made during the first year of the project. Most of the progress at this point has been on the theoretical and computational side. Here are the highlights: (1) A new code, tailored for high-end desktop computing, now combines modern Accelerated Dynamics (AD) with the well-tested Embedded Atom Method (EAM); (2) The new Accelerated Dynamics allows the study of relatively slow, thermally-activated processes, such as diffusion, which are much too slow for traditional Molecular Dynamics; (3) We have benchmarked the new AD code on a rather simple and well-known process: vacancy diffusion in copper; and (4) We have begun application of the AD code to the diffusion of vacancies in ordered intermetallics.
Effects of dislocations in Stranski-Krastanow quantum dots
The interrelations between structural and optical properties in Strasnki-Krastanow (S-K) quantum dots are examined trough different experiments that explore III-V quantum dots (QD) formation.