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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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ARM Aerial Facility (AAF) Dew Point Temperature from Gust Probe Sensor, Corrected and Merged with Nav Data
Merges the aafdewpoint.a1 data with aafnav.b1 data to make an aafdewpoint.b1 datastream that has only data in flight. Applies standard QC, as well.
ARM Aerial Facility (AAF) - Unmanned Aircraft Systems, Cloud Droplet Probe with QC and lat/lon/alt
The Cloud Droplet Probe (CDP) is designed to measure cloud droplet size distribution from 2 µm to 50 µm. The CDP and an appropriate data system can also calculate various other parameters including particle concentrations, effective diameter (ED), Median Volume Diameter (MVD), and Liquid Water Content (LWC). The b1 level adds standard quality control flags, and merges in flight navigation data.
ARM Aerial Facility (AAF) Water-based Condensation Particle Counter
The condensation particle counter (CPC) measures sub-micron aerosol particle number concentration by condensing fluid onto particles and causing them to grow to sizes that are easily detectable by optical scattering. The condensing liquid is typically an alcohol (e.g., butanol) or water. Depending on the CPC type, typical CPC instruments can count particles with sizes that range from 3 to 3000 nanometers (ultrafine CPC) or from 10 to 3000 nanometers (fine CPC).
Flexible, Low-Mass Robotic Arm Actuated by Electroactive Polymers (EAP) and Operated Equivalently to Human Hand
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Flexible, Low-mass Robotic Arm Actuatd by Electroactive Polymers (EAP) and Operated Equivalently to Human Hand
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A PC-Based Controller for Dextrous Arms
This paper describes the architecture and performance of a PC-based controller for 7-DOF dextrous manipulators. The computing platform is a 486-based personal computer equipped with a bus extender to access the robot Multibus controller, together with a single board computer as the graphical engine, and with a parallel I/O board to interface with a force-torque sensor mounted on the manipulator wrist.
One-Arm Interferometric Detectors of Gravitational Waves
This paper presents the interferometric detection of gravitational waves using multiple bounce parallel-beam systems. Results show it is possible to remove laser frequency fluctuations from an offset paralllel-beam interferometer without removing the gravitational wave signal.
The Thermal Design Evolution of the Phoenix Robotic Arm
An adequate warm-up heater approach was developed using analysis & previous Mars surface experience. In the worst-cold environment, all the actuators were able to warm to their minimum operating temperature within the required time. In the worst-hot environment, the maximum continuous actuator power dissipation during normal operations was determined. A mechanical thermostat provides best means to cope with a failed-on wrist heater & to ease RA operations planning.
The Interaction Between Boundary Layer and Convection Schemes in a WRF Simulation of Post‐Cold‐Frontal Clouds over the ARM East North Atlantic Site
The correct representation of lowlevel midlatitude clouds found in the wake of cold fronts strongly relies on the representation of planetary boundary layer (PBL) and convection processes, which are typically parameterized separately in numerical models. Using the Weather Research and Forecasting Model (WRF), this study investigates how distinct pairs of PBL and convection parameterization schemes represent cloud fraction in the postcoldfrontal region. The simulations focus on the region of the DOEARM Eastern North Atlantic observation site in the Azores Islands in the wake of a cold front that passed on December 25, 2015. Different PBL and convection schemes are combined to create 12 distinct configurations. The main differences between the selected physical parameterizations are the strength of vertical mixing and the entrainment. The simulations produce a wide range of cloud fractions, where some configurations significantly underestimate while others clearly overestimate satellite and surfacebased estimates of cloud fraction. A skill score is used to quantitatively assess the performance of each configuration with respect to groundbased radar data. The key processes that are found to significantly impact the cloud fraction distribution are the strength of the PBL decoupling, the vertical wind shear, entrainment and detrainment rates in shallow convection and the occurrence of drizzle. This indicates that to successfully simulate postcoldfrontal clouds, modeled physics must balance strong internal vertical mixing and weak exchange with the free troposphere. For this case study, cloud fraction was more sensitive to the choice of convection scheme than PBL scheme.
Intelligent Performance Analysis and Porting Tools for ARM-based HPC Systems
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ARM Shortwave and Longwave Radiometer Calibrations
This presentation provides a high-level overview of shortwave and longwave calibrations performed at the U.S. Department of Energy's Atmospheric Radiation Measurement program Southern Great Plains site.
NNSA Explorations: ARM for Supercomputing
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