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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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Numerical Simulation of the High-Speed Leg of the National Transonic Facility
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Understanding the Impacts of Land Surface and PBL Observations on the Terrestrial and Atmospheric Legs of Land-Atmosphere Coupling
Accurately representing land-atmosphere (L-A) interactions and coupling in NWP systems remains a challenge. New observations, incorporated into models via assimilation or calibration, hold the promise of improved forecast skill, but erroneous model coupling can hinder the benefits of such activities. To better understand model representation of coupled interactions and feedbacks, this study demonstrates a novel framework for coupled calibration of the Single Column Model (SCM) capability of the NASA Unified Weather Research and Forecasting (NU-WRF) system coupled to NASA’s Land Information System (LIS). The local land-atmosphere coupling (LoCo) process chain paradigm is used to assess the processes and connections revealed by calibration experiments. Two summer case studies in the U. S. Southern Great Plains are simulated in which LSM parameters are calibrated to diurnal observations of LoCo process chain components including 2-meter temperature, 2-meter humidity, surface fluxes (Bowen ratio), and PBL height. Results show a wide range of soil moisture and hydraulic parameter solutions depending on which L-A variable (i.e. observation) is used for calibration, highlighting that improvement in either SHP or ISM when not in tandem with the other can provide undesirable results. Overall, this work demonstrates that a process chain calibration approach can be used to assess L-A connections, feedbacks, strengths, and deficiencies in coupled models, as well as quantify the potential impact of new sources of observations of land-PBL variables on coupled prediction.
Evidence for the emergence of leg sympathetic vasoconstrictor tone with age in healthy women
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Treadmill exercise within lower body negative pressure protects leg lean tissue mass and extensor strength and endurance during bed rest
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Methodology for Switching Characterization Evaluation of Wide Band-gap Devices in a Phase-leg Configuration
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Impact of Ringing on Switching Losses of Wide Band-gap Devices in a Phase-leg Configuration
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15 kV Phase Leg Power Modules with SiC MIDSJT Devices
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Response to Khalaf et al. "Effect of a simulation of Am-241 deposition pattern in the leg bones on the detection efficiency of a high purity germanium detector"
Abstract not provided
Comparison of Second-Order Loads on a Tension-Leg Platform for Wind Turbines: Preprint
The first objective of this work is to compare the two floating offshore wind turbine simulation packages {DIFFRAC+aNySIM} and {WAMIT+FAST}. The focus is on second-order wave loads, and so first- and second-order wave loads are applied to a structure sequentially for a detailed comparison and a more precise analysis of the effects of the second-order loads. aNySIM does not have the capability to model flexible bodies, and so the simulations performed in this tool are done assuming a rigid body. FAST also assumes that the platform is rigid, but can account for the flexibility of the tower. The second objective is to study the effects of the second-order loads on the response of a TLP floating wind turbine. The flexibility of the tower must be considered for this investigation, and therefore only FAST is used.
Comparison of Second-Order Loads on a Tension-Leg Platform for Wind Turbines
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ACSELL: Actuation and Control System for Efficient Legged Locomotion.
Abstract not provided.
Multi-Leg One-Loop Gravity Amplitudes from Gauge Theory
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