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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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Chirality Dependence of Triplet Excitons in (6,5) and (7,5) Single-Wall Carbon Nanotubes Revealed by Optically Detected Magnetic Resonance
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Crystal structure of human PLD1 provides insight into activation by PI(4,5)P2 and RhoA
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Cost and energy efficient cyclic separation of 5-hydroxymethyl furfural from an aqueous solution
Selective separation of HMF from the aqueous phase and integration with downstream reactions via a two-stage adsorption and desorption scheme.
Synthesis of performance-advantaged polyurethanes and polyesters from biomass-derived monomers by aldol-condensation of 5-hydroxymethyl furfural and hydrogenation
Synthetic platform for production of biomass-derived monomers and performance-advantaged polymers with renewability, upgradability, and economic viability.
Colorimetric/photothermal dual-mode sensing detection of ascorbic acid based on a Ag[ i ] ion/3,3′,5,5′-tetramethylbenzidine (TMB) system
Colorimetric and photothermal dual-readout sensing detection of AA using a Ag + /TMB system.
Hotspot formation due to shock-induced pore collapse in 1,3,5,7-tetranitro-1,3,5,7-tetrazoctane (HMX): Role of pore shape and shock strength in collapse mechanism and temperature
The shock to detonation transition in heterogeneous high energy density solids starts with the spatial localization of mechanical energy into so-called hotspots that form due to the interaction between the leading wave and microstructural features and defects. We used large-scale molecular dynamics to characterize the hotspots resulting from the shock-induced collapse of cylindrical voids and elongated cracks focusing on the effect of shock strength, defect shape, and size. The temperature fields resulting from the collapse of cracks elongated along the shock direction show significantly higher sensitivity to both shock strength and size than cylindrical voids. Cracks 80 nm in length result in temperatures almost three times higher than voids 80 nm in diameter, reaching values corresponding to the ideal case of isentropic recompression of a gas. The molecular dynamics trajectories reveal the atomic origin of this contrasting behavior. While circular voids undergo a transition from viscoelastic pore collapse to a hydrodynamic regime with increasing shock strength, shock focusing in elongated cracks results in jetting and vaporization which, upon recompression, leads to increased heating.
Octahedral to tetrahedral bonding transitions in the local structure of phase change optical media Ge 2 Sb 2 Se 5 x Te 5-5 x with Se doping
Random access memories utilize fast, reversible switching between ordered and disordered states of matter in phase change materials (PCMs) such as Ge2Sb2Te5-5x. The short-range structure in the disordered phase has been described either as (i) a network of Ge tetrahedra or (ii) Peierls distorted Ge/Sb octahedra. The PCM transition was investigated in bulk Ge2Sb2Se5xTe5-5x (GSST), in which amorphization sets in with Se doping (x ≈ 0.85) upon quenching. GSST has a hexagonal crystalline ground state with Ge/Sb octahedral coordination, but the phase change transition to the amorphous state that is only observed when the system is quenched brings a short-range structure with sharp, tetrahedrally coordinated Ge/Sb correlations and shortened bonds that are distinctly different from the expected octahedral pairing.
SCALE Non-LWR Models for NRC Volume 5
This dataset contains input and result files of computational simulations with the SCALE code system. The simulations cover radionuclide inventory generation, criticality calculations, and dose rate/shielding analyses of various advanced reactors. Users wanting to reproduce results from this dataset are required to obtain a license to the SCALE code system for which details on the distribution can be found here: https://www.ornl.gov/scale/releases
Discovery of a comet at 5 deg from the Sun, during the total eclipse of July 20, 1963 /Decouverte d'une comete a 5 deg du soleil, durant l'eclipse totale du 20 Juillet 1963/.
Nonstellar object with comet characteristics observed during solar eclipse, using several filter-equipped cameras
Investigation of slip-ring assemblies quarterly report no.6, 5 aug. - 5 nov. 1964
Slip-ring assembly - wear debris spectrographic analysis, noise level, and rhodium modified plating
Space operations control center satellite situation report, vol. 5, no. 5
Catalog of orbiting space satellites, debris, and satellite lifetimes
Investigation of slip ring assemblies final report, 5 mar. 1964 - 5 may 1965
Ring, brush, and insulator materials effect on electrical noise and mechanical wear characteristics in space vehicle guidance systems - miniature slip ring assemblies