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  • Other Sources  (5)
  • 2010-2014  (5)
  • 2010  (5)
  • 1
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    The Gemini Planet Imager Calibration Wavefront Sensor Instrument (2010)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The Gemini Planet Imager is an extreme adaptive optics system that will employ an apodized-pupil coronagraph to make direct detections of faint companions of nearby stars to a contrast level of the 10(exp -7) within a few lambda/D of the parent star. Such high contrasts from the ground require exquisite wavefront sensing and control both for the AO system as well as for the coronagraph. Un-sensed non-common path phase and amplitude errors after the wavefront sensor dichroic but before the coronagraph would lead to speckles which would ultimately limit the contrast. The calibration wavefront system for GPI will measure the complex wavefront at the system pupil before the apodizer and provide slow phase corrections to the AO system to mitigate errors that would cause a loss in contrast. The calibration wavefront sensor instrument for GPI has been built. We will describe the instrument and its performance.
    Keywords: Lunar and Planetary Science and Exploration; Instrumentation and Photography
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Mapping Successional Stages in a Wet Tropical Forest Using Landsat ETM+ and Forest Inventory Data (2010)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: In this study, we test whether an existing classification technique based on the integration of Landsat ETM+ and forest inventory data enables detailed characterization of successional stages in a wet tropical forest site. The specific objectives were: (1) to map forest age classes across the La Selva Biological Station in Costa Rica; and (2) to quantify uncertainties in the proposed approach in relation to field data and existing vegetation maps. Although significant relationships between vegetation height entropy (a surrogate for forest age) and ETM+ data were detected, the classification scheme tested in this study was not suitable for characterizing spatial variation in age at La Selva, as evidenced by the error matrix and the low Kappa coefficient (12.9%). Factors affecting the performance of the classification at this particular study site include the smooth transition in vegetation structure between intermediate and advanced successional stages, and the low sensitivity of NDVI to variations in vertical structure at high biomass levels.
    Keywords: Earth Resources and Remote Sensing
    Type: Seminario de Atualizagco em SR & SIG Aplicados `Engenharia Florestal; Oct 04, 2010 - Oct 08, 2010; Curitiba; Brazil
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    NASA TECHNICAL REPORTS
  • 3
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    Graphene-Based Reversible Nano-Switch/Sensor Schottky Diode (2010)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: This proof-of-concept device consists of a thin film of graphene deposited on an electrodized doped silicon wafer. The graphene film acts as a conductive path between a gold electrode deposited on top of a silicon dioxide layer and the reversible side of the silicon wafer, so as to form a Schottky diode. By virtue of the two-dimensional nature of graphene, this device has extreme sensitivity to different gaseous species, thereby serving as a building block for a volatile species sensor, with the attribute of having reversibility properties. That is, the sensor cycles between active and passive sensing states in response to the presence or absence of the gaseous species.
    Keywords: Instrumentation and Photography
    Type: LEW-18477-1 , NASA Tech Briefs, October 2010; 7
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Development of a Tool to Recreate the Mars Science Laboratory Aerothermal Environment (2010)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The Mars Science Laboratory will enter the Martian atmosphere in 2012 with multiple char depth sensors and in-depth thermocouples in its heatshield. The aerothermal environment experienced by MSL may be computationally recreated using the data from the sensors and a material response program, such as the Fully Implicit Ablation and Thermal (FIAT) response program, through the matching of the char depth and thermocouple predictions of the material response program to the sensor data. A tool, CHanging Inputs from the Environment of FIAT (CHIEF), was developed to iteratively change different environmental conditions such that FIAT predictions match within certain criteria applied to an external data set. The computational environment is changed by iterating on the enthalpy, pressure, or heat transfer coefficient at certain times in the trajectory. CHIEF was initially compared against arc-jet test data from the development of the MSL heatshield and then against simulated sensor data derived from design trajectories for MSL. CHIEF was able to match char depth and in-depth thermocouple temperatures within the bounds placed upon it for these cases. Further refinement of CHIEF to compare multiple time points and assign convergence criteria may improve accuracy.
    Keywords: Space Sciences (General)
    Type: ARC-E-DAA-TN1820 , AIAA Thermophysics and Heat Transfer Conference; Jun 28, 2010 - Jul 01, 2010; Chicago, IL; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    The future of cephalopod populations, fisheries, culture, and research in Europe (2010)
    ICES
    In:  In: Cephalopod biology and fisheries in Europe. , ed. by Pierce, G. J., Allcock, L., Bruno, I., Bustamante, P., Gonzalez, A., Guerra, A., Jereb, P., Lefkaditou, E., Malham, S., Moreno, a., Pereira, J., Piatkowski, U., Rasero, M., Sanchez, P., Santos, M. B., Santurtun, M., Seixas, S., Sobrino, I. and Villanueva, R. ICES Cooperative Research Report, 303 . ICES, Copenhagen, Denmark, pp. 86-118. ISBN 978‐87‐7482‐078‐9
    Details
    Publication Date: 2019-06-25
    Type: Book chapter , NonPeerReviewed
    Format: text
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    PAPER (OCEANREP)
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