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202 Matching Results
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Water-bearing minerals on mars: source of observed mid-latitude water?
The Odyssey spacecraft documented the existence of heterogeneously distributed hydrogen at martian mid-latitudes, suggesting that large areas of the near-equatorial highlands contain near-surface deposits of 'chemically and/or physically bound H20 and/or OH' in amounts up to 3 .8% equivalent H20. Shallow occurrences of water ice are not stable near the martian equator, making the hydrogen deposits at these latitudes somewhat enigmatic. Clay minerals and zeolites have both been proposed as possible water-bearing constituents on Mars, and both are common terrestrial alteration products of hydrovolcanic basaltic ashes and palagonitic material comparable to those that may be widespread on Mars. Smectites within martian meteorites, attributed to hydrous alteration on Mars rather than on Earth, provide direct evidence of clay minerals from Mars. In addition, new thermal emission spectrometer (TES) data provide good evidence for unspecified zeolites in martian surface dust [6] . The nature of the hydrogen-containing material observed in the equatorial martian regolith is of particular importance to the question of whether hydrous minerals have formed in the past on Mars. Also, whether these minerals exist in a hydrated (i .e., containing H2O molecules in their structures) or dehydrated state is a crucial question . The existence of hydrous minerals is …
Date:
January 1, 2003
Creator:
Bish, D. L. (David L.); Carey, J. W. (James W.) & Fialips, C. I. (Clair I.)
Object Type:
Article
System:
The UNT Digital Library
Development and testing of laser-induced breakdown spectroscopy for the Mars Rover Program : elemental analysis at stand-off distances
One of the most Fundamental pieces of information about any planetary body is the elemental cornposition of its surface materials. The Viking Martian landers employed XRF (x-ray fluorescence) and the MER rovers are carrying APXS (alpha-proton x-ray spectrometer) instruments upgraded from that used on the Pathfinder rover to supply elemental composition information for soils and rocks for which direct contact is possible. These in-situ analyses require that the lander or rover be in contact with the sample
Date:
January 1, 2003
Creator:
Cremers, D. A. (David A.); Wiens, R. C. (Roger C.); Arp, Z. A. (Zane A.); Harris, R. D. (Ronny D.) & Maurice, S. (Sylvestre)
Object Type:
Article
System:
The UNT Digital Library
China’s Space Program: An Overview
This report gives an overview of China's Space program and the contents include launch activities, principles, funding, military space activities, international cooperation
Date:
October 21, 2003
Creator:
Smith, Marcia S.
Object Type:
Report
System:
The UNT Digital Library
The National Aeronautics and Space Administration’s FY2004 Budget Request: Description, Analysis, and Issues for Congress
This report analyzes the proposed budget of the fiscal year of 2004 and the requests of the National Aeronautics and Space Administration. Updated September 23, 2003.
Date:
September 23, 2003
Creator:
Smith, Marcia S.; Morgan, Daniel & Schacht, Wendy H.
Object Type:
Report
System:
The UNT Digital Library
Study of the characteristics of high-energy proton-induced gamma ray and neutron emission from materials that imitate surface of planets.
A proposed ISTC Project is discussed in the present paper. The proposal is aimed at experiments to determine the space-energy characteristics of the neutron and gamma ray emission fields generated by 0.2-0.8 GeV proton irradiation of thick targets composed of various elements. At present, reliable data on physical properties of secondary radiation from materials irradiated by intennediate- and high-energy protons for some fundamental and applied researches in astrophysics, space physics, atomic and nuclear physics, as well as for designing and operating the latest accelerators are lacking.
Date:
January 1, 2003
Creator:
Titarenko, Yury E.; Batyaev, Vyacheslav F.; Karpikhin, Evgeny I.; Zhivun, Valery M.; Koldobsky, Aleksander B.; Mulambetov, Ruslan D. et al.
Object Type:
Article
System:
The UNT Digital Library
Radiation load to the SNAP CCD
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
Object Type:
Report
System:
The UNT Digital Library
U.S. Space Programs: Civilian, Military, and Commercial
None
Date:
February 3, 2003
Creator:
Smith, Marcia S.
Object Type:
Report
System:
The UNT Digital Library
U.S. Space Programs: Civilian, Military, and Commercial
None
Date:
September 16, 2003
Creator:
Smith, Marcia S.
Object Type:
Report
System:
The UNT Digital Library
U.S. Space Programs: Civilian, Military, and Commercial
None
Date:
October 6, 2003
Creator:
Smith, Marcia S.
Object Type:
Report
System:
The UNT Digital Library
U.S. Space Programs: Civilian, Military, and Commercial
None
Date:
July 10, 2003
Creator:
Smith, Marcia S.
Object Type:
Report
System:
The UNT Digital Library
U.S. Space Programs: Civilian, Military, and Commercial
None
Date:
July 31, 2003
Creator:
Smith, Marcia S.
Object Type:
Report
System:
The UNT Digital Library
U.S. Space Programs: Civilian, Military, and Commercial
None
Date:
September 2, 2003
Creator:
Smith, Marcia S.
Object Type:
Report
System:
The UNT Digital Library
U.S. Space Programs: Civilian, Military, and Commercial
None
Date:
February 25, 2003
Creator:
Smith, Marcia S.
Object Type:
Report
System:
The UNT Digital Library
U.S. Space Programs: Civilian, Military, and Commercial
None
Date:
April 11, 2003
Creator:
Smith, Marcia S.
Object Type:
Report
System:
The UNT Digital Library
U.S. Space Programs: Civilian, Military, and Commercial
None
Date:
April 22, 2003
Creator:
Smith, Marcia S.
Object Type:
Report
System:
The UNT Digital Library
U.S. Space Programs: Civilian, Military, and Commercial
None
Date:
April 28, 2003
Creator:
Smith, Marcia S.
Object Type:
Report
System:
The UNT Digital Library
U.S. Space Programs: Civilian, Military, and Commercial
None
Date:
May 20, 2003
Creator:
Smith, Marcia S.
Object Type:
Report
System:
The UNT Digital Library
U.S. Space Programs: Civilian, Military, and Commercial
None
Date:
May 29, 2003
Creator:
Smith, Marcia S.
Object Type:
Report
System:
The UNT Digital Library
U.S. Space Programs: Civilian, Military, and Commercial
None
Date:
June 19, 2003
Creator:
Smith, Marcia S.
Object Type:
Report
System:
The UNT Digital Library
Space Stations
None
Date:
February 10, 2003
Creator:
Smith, Marcia S.
Object Type:
Report
System:
The UNT Digital Library
Space Stations
None
Date:
March 19, 2003
Creator:
Smith, Marcia S.
Object Type:
Report
System:
The UNT Digital Library
Space Stations
None
Date:
April 10, 2003
Creator:
Smith, Marcia S.
Object Type:
Report
System:
The UNT Digital Library
Space Stations
None
Date:
May 5, 2003
Creator:
Smith, Marcia S.
Object Type:
Report
System:
The UNT Digital Library
Space Stations
None
Date:
June 17, 2003
Creator:
Smith, Marcia S.
Object Type:
Report
System:
The UNT Digital Library