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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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Southeast US Climate II: Leveraging Earth Observations to Estimate Carbon Dioxide Emissions from Forest Cover Loss in Alabama and Tennessee
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SAGE III/ISS Validation Methods
Spatiotemporal collocation of measurements between instruments is an essential yet challenging component of the data validation process. Traditional methods of collocation may simply consider length of time and physical distance between measurements. However, the distribution of atmospheric constituents may change rapidly over time and space, so care must be taken to ensure that matched measurements represent the same environment and will not introduce unnecessary bias. More advanced collocation methods may consider additional physical parameters to minimize inappropriate matches with large differences caused by local circulation. We report results of SAGE III/ISS validation with ground-based measurements using advanced collocation methods, and assessments are performed on the quality and presence of trends in both datasets.
NASA Air Mobility Pathfinders (AMP) Project Concepts Workshop
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Earth’s Upper Atmosphere After the Hunga Tonga – Hunga Ha’apai Eruption as Seen By the Stratospheric Aerosol and Gas Experiment III on the International Space Station (Sage III/ISS)
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Gridded National Inventory of U.S. Methane Emissions
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Nuclear Fuels and Materials Library (NFML) Factsheet Photos
Photos to use within the Nuclear Materials and Fuels Library (NFML) factsheet, Nuclear Science User Facilities (NSUF) site, or other public articles.
Additive manufacturing print-heads for exotic material applications
Described herein is an additive manufacturing apparatus that is well-suited for constructing piezoelectric sensors. The additive manufacturing apparatus includes an extrusion nozzle formed of a conductive material such as aluminum. The extrusion nozzle has a channel by way of which printing material exits the extrusion nozzle, wherein a build plate is configured to receive the printing material responsive to the printing material exiting the extrusion nozzle. An arc suppressor formed of a semiconductor is coupled to the extrusion nozzle and is configured to dissipate excess charge that would otherwise exist on the extrusion nozzle when a relatively high bias voltage is applied to the extrusion nozzle. Thus, the arc suppressor mitigates arcing between the extrusion nozzle and the build plate. Arc suppressing gas is also optionally introduced into a printing region, thereby further mitigating arcing between the extrusion nozzle and the build plate.
NSUF Annual Report
Annual report for work completed during FY-21 for the Nuclear Science User Facilities
Using Laboratory LIBS Acoustics Experiments to Elucidate SuperCam Microphone Data on Mars.
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Direct observation of 3D topological spin textures and their interactions using soft x-ray vector ptychography
Magnetic topological defects are energetically stable spin configurations characterized by symmetry breaking. Vortices and skyrmions are two well-known examples of 2D spin textures that have been actively studied for both fundamental interest and practical applications. However, experimental evidence of the 3D spin textures has been largely indirect or qualitative to date, due to the difficulty of quantitively characterizing them within nanoscale volumes. Here, we develop soft x-ray vector ptychography to quantitatively image the 3D magnetization vector field in a frustrated superlattice with 10 nm spatial resolution. By applying homotopy theory to the experimental data, we quantify the topological charge of hedgehogs and anti-hedgehogs as emergent magnetic monopoles and probe their interactions inside the frustrated superlattice. We also directly observe virtual hedgehogs and anti-hedgehogs created by magnetically inert voids. We expect that this new quantitative imaging method will open the door to study 3D topological spin textures in a broad class of magnetic materials. Our work also demonstrates that magnetically frustrated superlattices could be used as a new platform to investigate hedgehog interactions and dynamics and to exploit optimized geometries for information storage and transport applications.
NSUF FY22 Annual Report
Annual report for work completed during FY-22 for the Nuclear Science User Facilities. Attached is document with final recommendations. Changes are nearly all grammatical errors.
NSUF FY23 Annual Report
Annual report for work completed during FY-23 for the Nuclear Science User Facilities.