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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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Determination of Sticking Probability Based on the Critical Velocity Derived from a Visco-Elastoplastic Model to Characterize Ash Deposition in an Entrained Flow Gasifier
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Metal Release and Speciation Changes during Wet Aging of Coal Fly Ashes
Abstract not provided
Decoupling the role of lignin, cellulose/hemi-cellulose, and ash on ZnCl 2 -activated carbon pore structure
Controlling biomass sugar and lignin composition enables the development of a clear correlation between composition and activate carbon pore structure.
Particle Size Effect of Volcanic Ash towards Developing Engineered Portland Cements
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Recrystallization of an amorphized epitaxial phase-change alloy: A phoenix arising from the ashes
Epitaxial Ge{sub 2}Sb{sub 2}Te{sub 5} films grown on Si(111) by molecular beam epitaxy were reversibly switched between crystalline and amorphous states over a large area using femtosecond laser pulses. The structural and spatial homogeneity of the as-grown epitaxial and laser-switched areas on the sample were investigated by synchrotron nanofocus high resolution x-ray diffraction. The investigation clearly demonstrated that the single crystalline metastable cubic phase of Ge{sub 2}Sb{sub 2}Te{sub 5} is restored after switching. No polycrystalline features, not only on the average but even on the nanometer scale of the x-ray beam, were observed.
Preventing ash from poisoning proton–boron 11 fusion plasmas
Proton–boron 11 (pB11) fusion is safe and clean, but also difficult to harness for breakeven power production. Particularly deleterious are fusion-born alpha particles, which massively increase both plasma pressure and bremsstrahlung losses unless they are pulled promptly from the plasma. We show that even if one cannot extract the alphas quickly, one can still achieve net power production, by separating the plasma into two regions: a fusion region, accessible to all species, and an alpha storage region, accessible only to alphas and electrons. This new demixing strategy could make pB11 fusion much easier to achieve.
Modelling Outer Ash Deposition Rates in Second Generation Atmospheric Pressure Oxy-Fuel Combustion Systems
Not provided.
Fluidized bed combustion coal fly ash: comparative evaluation for potential use in alkali-activated binders
Not provided.
Ash-detonation interactions in multi-dimensional simulation of Type Ia supernovae
Thermonuclear supernovae (Type Ia SNe) are believed to result from the complete disruption of a near-Chandrasekhar-mass white dwarf (WD) by explosive thermonuclear runaway. Their use as cosmological distance indicators as well as comprehension of their role in galactic chemical evolution ultimately depends on a reliable and robust understanding of the explosion mechanism. We have undertaken a study of turbulent thermonuclear combustion in these events, focusing on the effects of increased physical fidelity in simulations, through improved resolution and increased dimensionality. We begin with a series of detonation simulations at low WD densities that we will use for baseline metrics against which subsequent simulations will be measured. We have performed these simulations using a version of the FLASH code[1]. We show progress on a set of simulations in one, two, and three spatial dimensions designed to explore the impact of dimensionality on the evolution of the detonations, and thereby clearly delineate the role of the nuclear kinetics. By performing a suite of simulations incorporating an alpha network at several levels of maximum mesh refinement, we will be able to quantify the effects of resolution and network size on future results.
Evaluation of Sustainable Portland Cement Composites Modified with Diatomaceous Earth, Fly Ash, & Spirulina
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EVALUATING THE EFFECTS OF THE KINGSTON COAL ASH RELEASE ON FISH REPRODUCTION AND EARLY LIFE STAGES: IN VITRO SPAWNING STUDY
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Resources from the Ashes: Rare Earth Elements in Coal Waste Byproducts [Slides]
Presented at the University of Oklahoma Department of Geosciences Shell Colloquium Series.
Supercritical Fluid Extraction of Rare Earth Elements from Coal Fly Ash.
Abstract not provided.