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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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We report the Discovery of Cepheid variable stars in the galaxy NGC 4414, as part of the Hubble Space Telescope (HST) Key Project on the Extragalactic Distance Scale. Observations were obtained with the HST Wide Field and Planetary Camera 2 (WFPC2) for 13 epochs at V (F555W) and 4 at I (F814W).
In contrast to most commercial air traffic today, vehicles serving the urban air mobility (UAM) market are anticipated to operate within communities and be close to the public at large. The approved model for assessing environmental impact of air traffic actions in the United States, the Federal Aviation Administration (FAA) Aviation Environmental Design Tool (AEDT), does not directly support analysis of such operations due to a combined lack of UAM aircraft flight performance model data and aircraft noise data. This paper addresses the latter by offering two prediction-based approaches for generation of noise-power-distance (NPD) data for use within AEDT. One utilizes AEDT’s fixed-wing aircraft modeling approach and the other utilizes the rotary-wing aircraft modeling approach.
In contrast to most commercial air traffic today, vehicles serving the urban air mobility (UAM) market are anticipated to operate within communities and be close to the public at large. The approved model for assessing environmental impact of air traffic actions in the United States, the Federal Aviation Administration (FAA) Aviation Environmental Design Tool (AEDT), does not directly support analysis of such operations due to a combined lack of UAM aircraft flight performance model data and aircraft noise data. This paper addresses the latter by offering two prediction-based approaches for generation of noise-power-distance (NPD) data for use within AEDT. One utilizes the AEDT fixed-wing aircraft modeling approach and the other utilizes the AEDT rotary-wing aircraft modeling approach.
Effect of ignition method on detonation distances in hydrogen-oxygen mixtures
Effects of time lag due to long transmission distances upon remote control
Experimental detonation velocities and induction distances in hydrogen-nitrous oxide mixtures
Effects of time lag due to long transmission distances upon remote control
Generalization of laplace expansion to arbitrary powers and functions of distance between two points
Physiological mechanisms involved in visual perception of distance to moving objects
Perception and representation of shortest distance on plane and on sphere
Two-center expansion for powers of distance between two points - mathematical physics
Echos at great distance observed on ionograms of alouette satellite
Control of unmanned scientific satellites and unified tracking/command/telemetry at lunar distances
Ground system for reception of television from spacecraft at lunar distance
Classification, magnitude, relationship, spatial distribution, motion, and distances of galaxies
Finite-density zero-pressure models of universe based on general relativity theory - approximate solution for luminosity distance
In the transferring of material remotely through thick radiation shielding walls, a drawer is mounted on rollers which operate on rails carried on a slide carriage to eliminate the feature of the slide hardware projecting beyond the drawer when the drawer is extended its full distance.
Magnetoaerodynamic drag and shock stand-off distance studies - free stream Mach number and specific heat ratio measurements