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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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At least 37 records · Page 2
All sourcesNASA NTRSDOE OSTI
DOE OSTI2024

Swirls and scoops: Ice base melt revealed by multibeam imagery of an Antarctic ice shelf

Knowledge gaps about how the ocean melts Antarctica’s ice shelves, borne from a lack of observations, lead to large uncertainties in sea level predictions. Using high-resolution maps of the underside of Dotson Ice Shelf, West Antarctica, we reveal the imprint that ice shelf basal melting leaves on the ice. Convection and intermittent warm water intrusions form widespread terraced features through slow melting in quiescent areas, while shear-driven turbulence rapidly melts smooth, eroded topographies in outflow areas, as well as enigmatic teardrop-shaped indentations that result from boundary-layer flow rotation. Full-thickness ice fractures, with bases modified by basal melting and convective processes, are observed throughout the area. This new wealth of processes, all active under a single ice shelf, must be considered to accurately predict future Antarctic ice shelf melt.

54 ENVIRONMENTAL SCIENCES↗
DOE OSTI2019

Thermal Analysis of Simulated Nitrate Salt and sWheat Scoop ® Mixtures

The Department of Energy (DOE) Environmental Management Los Alamos Field Office (EM-LA) is examining options for managing its transuranic (TRU) waste currently in interim storage at the Waste Control Specialists LLC (WCS) facility located near Andrews, Texas. As part of this examination, a Draft Engineering Evaluation and Initial Feasibility Study, collectively referred to as the Feasibility Study, is being implemented to investigate the feasibility of different options and methodologies for preparing the waste for transport and disposal at the Waste Isolation Pilot Plant (WIPP). To support the needs identified in the Feasibility Study, the Savannah River National Laboratory (SRNL) has been requested to pursue the characterization and assess the classification of inappropriately treated Remediated Nitrate Salt (RNS) wastes generated at the Los Alamos National Laboratory (LANL). Previous results from experimentation conducted at SRNL showed that both reaction time and water content had an observable effect on the exothermicity of a remediated waste surrogate under conditions mimicking the SW-846 Method 1050 test for spontaneous combustion. To further elucidate parameters that may contribute to the propensity for spontaneous combustion, SRNL designed and performed additional benchscale testing on simulated wastes targeting the compositions of six remediated drums of similar material previously sampled and characterized at LANL. Differential scanning calorimetry analysis displayed a general decrease in reactivity with increasing age and triethanolamine addition. Review of heat generation data versus analyzed compositions indicate that regardless of salt composition, water content, or age, no substantial combustion was witnessed for any mixture tested that contained at least 50 wt% of organic material.

12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE W↗
NASA NTRS1976

Unlimbering Viking's scoop

A number of difficulties which were encountered in deploying the Viking 1 lander's surface-sampler arm are discussed. When the surface sampler jammed during its initial operation, the problem was studied with the aid of tests on a full-scale lander mock-up. It was found that the difficulty was caused by a boom latch pin which had failed to fall clear. The surface-sampler arm could subsequently be freed by modifying the original command sequence. Another difficulty could be overcome by a similar approach.

Spitzer, C. R.↗