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  • Other Sources  (3)
  • Lunar and Planetary Science and Exploration  (2)
  • Air Transportation and Safety; Fluid Mechanics and Thermodynamics  (1)
  • 2020-2022
  • 2015-2019  (3)
  • 2019  (3)
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  • Other Sources  (3)
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  • 2020-2022
  • 2015-2019  (3)
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  • 1
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    Spectral Properties of Hydrated Poorly Crystalline Materials for Spectral Analysis of the Moon and Mars (2019)
    In:  CASI
    Details
    Publication Date: 2019-07-20
    Description: Visible/near-infrared (VNIR) reflectance spectra of both Mars [1] and the Moon [2] include hydration bands that vary across the planet and are not well explained in some cases. Poorly crystalline phases have been found at ~30-70 wt.% by CheMin in Gale crater, Mars in all samples measured to date [3]. Here we report on VNIR reflectance spectra of a large collection of amorphous and poorly crystalline materials. These include opal, allophane, imogolite, iron hydroxides/ oxyhydroxides (FeOx), and several synthetic materials containing Si, Al and/or Fe. All of these contain hydration bands due to water and OH that can be used to identify these materials remotely on planetary bodies.
    Keywords: Lunar and Planetary Science and Exploration
    Type: JSC-E-DAA-TN66032 , Lunar and Planetary Science Conference; Mar 18, 2019 - Mar 22, 2019; Woodlands, TX; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Measured Interfacial Residual Strains Produced by In-Flight Ice (2019)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The formation of ice on aircraft is a highly dynamic process during which ice will expand and contract upon freezing and undergoing changes in temperature. Finite Element Analysis (FEA) simulations were performed investigating the stress build up in a simplified case with uniform temperature changes between an idealized ice sample and acrylic substrate. These results were used to place strain gages on custom-built acrylic and aluminum specimens; these specimens were then placed in icing conditions such that ice was grown on top of the specimen. Tee rosettes were placed in two configurations adjacent to thermocouple sensors. It was hypothesized that the ice would expand on freezing and contract as the temperature of the interface returned to the equilibrium conditions. While results from the aluminum specimens matched this hypothesis, results from the acrylic specimens show a short period of contraction followed by a much larger expansion at the interface, indicating more complex ice growth thermodynamics than anticipated. Samples were observed to delaminate, and the data suggests that the residual strain is significant to the shedding of ice for in-flight applications.
    Keywords: Air Transportation and Safety; Fluid Mechanics and Thermodynamics
    Type: GRC-E-DAA-TN66901 , International Conference on Icing of Aircraft, Engines, and Structures; Jun 17, 2019 - Jun 21, 2019; Minneapolis, MN; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Mars Science Laboratory Observations of the 2018/Mars Year 34 Global Dust Storm (2019)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Mars Science Laboratory Curiosity rover observations of the 2018/Mars year 34 global/planet-encircling dust storm represent the first in situ measurements of a global dust storm with dedicated meteorological sensors since the Viking Landers. The Mars Science Laboratory team planned and executed a science campaign lasting approximately 100 Martian sols to study the storm involving an enhanced cadence of environmental monitoring using the rover's meteorological sensors, cameras, and spectrometers. Mast Camera 880-nanometer optical depth reached 8.5, and Rover Environmental Monitoring Station measurements indicated a 97 percent reduction in incident total ultraviolet solar radiation at the surface, 30 degrees Kelvin reduction in diurnal range of air temperature, and an increase in the semidiurnal pressure tide amplitude to 40 pascals. No active dust-lifting sites were detected within Gale Crater, and global and local atmospheric dynamics were drastically altered during the storm. This work presents an overview of the mission's storm observations and initial results.
    Keywords: Lunar and Planetary Science and Exploration
    Type: GSFC-E-DAA-TN66591 , GSFC-E-DAA-TN65722 , Geophysical Research Letters (ISSN 0094-8276) (e-ISSN 1944-8007); 46; 1; 71-79
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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