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  • Other Sources  (2)
  • NASA Technical Reports  (2)
  • Bibliography on Seismology
  • COMPOSITE MATERIALS  (1)
  • Earth Resources and Remote Sensing; Mathematical and Computer Sciences (General)  (1)
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  • Other Sources  (2)
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  • NASA Technical Reports  (2)
  • Bibliography on Seismology
Keywords
Years
  • 1
    facet.materialart.
    Unknown
    Manufacture of multi-layer woven preforms (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: This paper reviews current three-dimensional weaving processes and discusses a process developed at the Mars Mission Research Center of North Carolina State University to weave three-dimensional multilayer fabrics. The fabrics may vary in size and complexity from simple panels to T-section or I-section beams to large stiffened panels. Parameters such as fiber orientation, volume fraction of the fiber required in each direction, yarn spacings or density, etc., which determine the physical properties of the composites are discussed.
    Keywords: COMPOSITE MATERIALS
    Type: ASME Winter Annual Meeting; Nov 27, 1988 - Dec 02, 1988; Chicago, IL; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Unknown
    A Framework for Quantifying the Impacts of Sub-Pixel Reflectance Variance and Covariance on Cloud Optical Thickness and Effective Radius Retrievals Based on the Bi-Spectral Method. (2017)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The so-called bi-spectral method retrieves cloud optical thickness () and cloud droplet effective radius (re) simultaneously from a pair of cloud reflectance observations, one in a visible or near infrared (VIS/NIR) band and the other in a shortwave-infrared (SWIR) band. A cloudy pixel is usually assumed to be horizontally homogeneous in the retrieval. Ignoring sub-pixel variations of cloud reflectances can lead to a significant bias in the retrieved and re. In this study, we use the Taylor expansion of a two-variable function to understand and quantify the impacts of sub-pixel variances of VIS/NIR and SWIR cloud reflectances and their covariance on the and re retrievals. This framework takes into account the fact that the retrievals are determined by both VIS/NIR and SWIR band observations in a mutually dependent way. In comparison with previous studies, it provides a more comprehensive understanding of how sub-pixel cloud reflectance variations impact the and re retrievals based on the bi-spectral method. In particular, our framework provides a mathematical explanation of how the sub-pixel variation in VIS/NIR band influences the re retrieval and why it can sometimes outweigh the influence of variations in the SWIR band and dominate the error in re retrievals, leading to a potential contribution of positive bias to the re retrieval.
    Keywords: Earth Resources and Remote Sensing; Mathematical and Computer Sciences (General)
    Type: GSFC-E-DAA-TN39722 , AIP Conference Proceedings; 1810; 1; 030002
    Format: text
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    NASA TECHNICAL REPORTS
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