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  • Lunar and Planetary Science and Exploration  (11)
  • THERMODYNAMICS AND COMBUSTION  (6)
  • 1
    Publication Date: 2006-10-26
    Description: Hemispherical spectral emission of ablation chars, carbon, and zirconium oxide formed during reentry
    Keywords: THERMODYNAMICS AND COMBUSTION
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  • 2
    Publication Date: 2011-08-16
    Description: Ablation chars, carbon and graphite spectral emittance and reflectance as function of wavelength and temperature, noting applications to atmospheric entry heat shielding
    Keywords: THERMODYNAMICS AND COMBUSTION
    Type: ; 20-25, 47 (
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  • 3
    Publication Date: 2017-10-02
    Description: The recent discovery of vast quantities of near-subsurface ice in both polar regions of Mars by the Mars Odyssey Gamma Ray Spectrometer (GRS) has presented us with an interesting quandary. On one hand, these deposits, found poleward of 60 deg in both hemispheres, are consistent with thermal models suggesting ice will be best protected in these regions during periods of high obliquity. On the other hand, the current paradigm regarding the placement of these deposits, i.e., diffusive deposition of water vapor, appears to be inconsistent with the large volume mixing ratios (approx. 90%) inferred from the GRS data. This incongruity argues that diffusion alone cannot be the primary mechanism for the creation of these reservoirs, and that an alternate, large-scale process should be considered.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Third International Conference on Mars Polar Science and Exploration; LPI-Contrib-1184
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  • 4
    Publication Date: 2017-10-02
    Description: Much of the interest in the polar regions centers on the fact that they likely contain the best record of Martian climate change on time scales from years to eons. This expectation is based upon the observed occurrence of weathering product deposits and volatile reservoirs that are coupled to the climate. Interpretation and understanding of these records requires understanding of the mechanisms that involve the exchange of dust, water, and carbon dioxide between the surface and atmosphere, and the atmospheric redistribution of these species. We will summarize our use of the GFDL Mars general circulation model (MGCM), to exploration aspects of the interaction between the global climate and the polar regions. For example, our studies have shown that while the northern polar cap is the dominant seasonal source for water, it can act as a net annual source or sink for water, depending upon the cap temperatures and the bulk humidity of the atmosphere. This behavior regulates the annual and global average humidity of the atmosphere, as the cap acts as a sink if the atmosphere is too wet and a source if it is too dry. We will then focus our presentation on the ability of the MGCM to simulate the observed diurnal variations of surface temperature. We are particularly interested in assessing the influence of dust aerosol and water ice clouds on simulated surface temperature and the comparison with observations. Surface thermal inertia and albedo are critical boundary inputs for MGCM simulations. Thermal inertia is also of intrinsic interest as it may be related to properties of the surface such as particle size and surface character.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Third International Conference on Mars Polar Science and Exploration; LPI-Contrib-1184
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  • 5
    Publication Date: 2017-10-02
    Description: The daily and seasonal variation of surface temperature is a central element in the description of martian climate. Surface thermal inertia and albedo are critical boundary inputs for simulating surface temperature in Mars general circulation models (MGCMs). Thermal inertia (TI) is also of intrinsic interest as it may be related to regolith properties such as particle size and surface character and so high spatial resolution is desirable. The recent mapping of TI at very high (0.25 deg) spatial resolution was achieved by fitting a thermal model to surface temperature observations obtained over a broad range of several martian years. However, varying atmospheric opacity (dust and water ice clouds) can significantly influence the estimated TI field and this effect was not fully compensated for. Opacity leads to an increase in morning temperature and a decrease in afternoon temperature, thus increasing the apparent thermal inertia.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Lunar and Planetary Science XXXVI, Part 21; LPI-Contrib-1234-Pt-21
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  • 6
    Publication Date: 2019-05-23
    Description: Hemispherical spectral emittance of ablation chars, carbon, and zirconia during atmospheric reentry
    Keywords: THERMODYNAMICS AND COMBUSTION
    Type: NASA-TN-D-2704
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  • 7
    Publication Date: 2018-06-08
    Keywords: Lunar and Planetary Science and Exploration
    Type: American Geophysical Union Annual Fall Meeting; San Francisco, CA; United States
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  • 8
    Publication Date: 2018-06-11
    Description: We have examined the influence of a regolith on the water cycle with a focus on high obliquity periods on Mars. Our findings show that while the regolith will almost certainly interact with the atmosphere initially, it is only a transient effect, and ice will form on the surface once the regolith is effectively isolated from the atmosphere. These low latitude deposits could conceivably be ice deposits formed at high obliquity and are certainly presently out of thermal equilibrium, but remain due to the insulating effect of a dust lag.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Lunar and Planetary Science XXXV: Special Session: Mars Climate Change; LPI-Contrib-1197
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  • 9
    Publication Date: 2019-07-13
    Description: Visible and near IR spectral reflectance and emittance at high temperature of ablation chars, carbon and graphite
    Keywords: THERMODYNAMICS AND COMBUSTION
    Type: AIAA PAPER 67-326 , THERMOPHYSICS SPECIALIST CONFERENCE; Apr 17, 1967 - Apr 20, 1967; NEW ORLEANS, LA
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  • 10
    Publication Date: 2019-07-13
    Description: Recent theoretical and experimental studies in heat transfer and fluid mechanics, including some environmental protection investigations, are presented in a number of papers. Some of the topics covered include condensation heat transfer, a model of turbulent momentum and heat transfer at points of separation and reattachment, an explicit scheme for calculations of confined turbulent flows with heat transfer, heat transfer effects on a delta wing in subsonic flow, fluid mechanics of ocean outfalls, thermal plumes from industrial cooling water, a photochemical air pollution model for the Los Angeles air basin, and a turbulence model of diurnal variations in the planetary boundary layer. Individual items are announced in this issue.
    Keywords: THERMODYNAMICS AND COMBUSTION
    Type: Heat Transfer and Fluid Mechanics Institute; Jun 12, 1974 - Jun 14, 1974; Corvallis, OR; US
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