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Radioisotope Electric Propulsion for Deep Space Sample Return

Description: The need to answer basic questions regarding the origin of the Solar System will motivate robotic sample return missions to destinations like Pluto, its satellite Charon, and objects in the Kuiper belt. To keep the mission duration short enough to be of interest, sample return from objects farther out in the Solar System requires increasingly higher return velocities. A sample return mission involves several complicated steps to reach an object and obtain a sample, but only the interplanetary r… more
Date: July 14, 2009
Creator: Noble, Robert J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

A Reliability Improvement Program Planning Report for the SNAP 10A Space Nuclear Power Unit

Description: The estimated achieved reliability of SNAP 10A space nuclear power units will be relatively low at the timeof the first SNAPSHOT flight test in April 1963 and the existing R&D program does not provide a significant reliabiity growth thereafter. The total costs of an 8-satellite network using SNAP 10A units over a 5-year period has been approximated for the case where the total cost of a single satellite launched is 8 million dollars.
Date: March 14, 1961
Creator: Coombs, M. G.; Smith, C. K. & Wilson, L. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Development and Comparison of Ground and Satellite-based Retrievals of Cirrus Cloud Physical Properties

Description: This report is the final update on ARM research conducted at DRI through May of 2006. A relatively minor amount of work was done after May, and last month (November), two journal papers partially funded by this project were published. The other investigator on this project, Dr. Bob d'Entremont, will be submitting his report in February 2007 when his no-cost extension expires. The main developments for this period, which concludes most of the DRI research on this project, are as follows: (1) Fur… more
Date: October 14, 2009
Creator: Mitchell, David L
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Radiation load to the SNAP CCD

Description: Results of an express Monte Carlo analysis with the MARS14 code of radiation load to the CCD optical detectors in the Supernova Acceleration Project (SNAP) mission presented for realistic radiation environment over the satellite orbit.
Date: August 14, 2003
Creator: N. V. Mokhov, I. L. Rakhno and S. I. Striganov
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Comparison of Convection Characteristics at the Tropical Western Pacific Darwin Site Between Observation and Global Climate Models Simulations

Description: One of the scientific objectives of the ARM Tropical Warm Pool International Cloud Experiment (TWPICE) planned for early 2006 at Darwin, Australia is to describe convection characteristics and its interaction with the large-scale fields. In view of the short duration of the experiment, it is important to determine the long-term statistics of convection and its associated clouds from the observations and global climate models (GCM) so as to put the experiment results in proper climate perspectiv… more
Date: March 14, 2005
Creator: Zhang, G. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Assessment of Ivanpah Playa as a Site for Thermal Vicarious Calibration for the MTI Satellite

Description: The Savannah River Technology Center conducted four vicarious reflectance calibrations at Ivanpah Playa, California since July 2000 in support of the MTI satellite. The potential of the playa as a thermal calibration site was also investigated in the campaigns with a mobile Fourier transform infrared spectrometer. The multi-year study shows time and spatial variability in the spectral emissivity. The ground truth temperature and emissivity correlate quite well with the data from the MTI satelli… more
Date: March 14, 2003
Creator: Villa-Aleman, E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
captions transcript

[News Clip: Auto Satellite]

Description: Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date: July 14, 1986, 5:00 p.m.
Duration: 2 minutes 08 seconds
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Item Type: Refine your search to only Video
Partner: UNT Libraries Special Collections
captions transcript

[News Clip: NAB]

Description: Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date: April 14, 1986, 10:00 p.m.
Duration: 1 minute 51 seconds
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Item Type: Refine your search to only Video
Partner: UNT Libraries Special Collections
open access

Constraining Dark Matter Models from a Combined Analysis of Milky Way Satellites with the Fermi Large Area Telescope

Description: Satellite galaxies of the Milky Way are among the most promising targets for dark matter searches in gamma rays. We present a search for dark matter consisting of weakly interacting massive particles, applying a joint likelihood analysis to 10 satellite galaxies with 24 months of data of the Fermi Large Area Telescope. No dark matter signal is detected. Including the uncertainty in the dark matter distribution, robust upper limits are placed on dark matter annihilation cross sections. The 95% c… more
Date: September 14, 2012
Creator: Ackermann, M.; Ajello, M.; Albert, A.; Atwood, W. B.; Baldini, L.; Ballet, J. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Self pressuring HTP feed systems

Description: Hydrogen peroxide tanks can be pressurized with decomposed HTP (high test hydrogen peroxide) originating in the tank itself. In rocketry, this offers the advantage of eliminating bulky and heavy inert gas storage. Several prototype self-pressurizing HTP systems have recently been designed and tested. Both a differential piston tank and a small gas-driven pump have been tried to obtain the pressure boost needed for flow through a gas generator and back to the tank. Results include terrestrial ma… more
Date: October 14, 1999
Creator: Whitehead, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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