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  • 1
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    Green Turtle (Chelonia mydas) Nesting Underscores the Importance of Protected Areas in the Northwestern Gulf of Mexico (2020)
    Frontiers Media
    Details
    Publication Date: 2020-08-11
    Electronic ISSN: 2296-7745
    Topics: Biology
    Published by Frontiers Media
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    PAPER CURRENT
  • 2
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    Hypothermic stunning of green sea turtles in a western Gulf of Mexico foraging habitat (2017)
    Public Library of Science
    Details
    Publication Date: 2017-03-17
    Electronic ISSN: 1932-6203
    Topics: Medicine , Natural Sciences in General
    Published by Public Library of Science
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    PAPER CURRENT
  • 3
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    NEP systems model (1993)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: A new nuclear electric propulsion (NEP) systems analysis code is discussed. The new code is modular and consists of a driver code and various subsystem models. The code models five different subsystems: (1) reactor/shield; (2) power conversion; (3) heat rejection; (4) power management and distribution (PMAD); and (5) thrusters. The code optimizes for the following design criteria: minimum mass; minimum radiator area; and low mass/low area. The code also optimizes the following parameters: separation distance; temperature ratio; pressure ratio; and transmission frequency. The discussion is presented in vugraph form.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: Nuclear Propulsion Technical Interchange Meeting, Volume 2; p 1098-1102
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    NEP systems model (1993)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Various aspects of nuclear electric propulsion (NEP) systems analysis and modeling are discussed. The following specific topics are covered: (1) systems analysis challenges; (2) goals for NEP systems analysis; (3) the Nuclear Propulsion Office approach; and (4) NEP subsystem model development. The discussion is presented in vugraph form.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: Nuclear Propulsion Technical Interchange Meeting, Volume 2; p 1095-1098
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    The 100-500 kWe NEP systems (1993)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Systems technology for nuclear electric propulsion (NEP) vehicles is discussed. The following topics are discussed: the SP-100 reactor; dynamic power conversion; heat rejection; and krypton ion thrusters. The discussion is presented in vugraph form.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: Nuclear Propulsion Technical Interchange Meeting, Volume 2; p 1078-1084
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Nuclear electric propulsion options for piloted Mars missions (1993)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Three nuclear electric propulsion (NEP) systems are discussed. The three systems are as follows: a system based on current SP-100 technology; a potassium Rankine-cycle based power conversion system, and an argon ion thruster system. The system will be researched for implementation in several possible vehicle configurations. The following are among the possible Mars vehicle configurations: a piloted 15 MWe multi-reactor vehicle; a piloted 10 MWe vehicle with ECCV; a piloted 10 MWe modular vehicle; piloted 10 and 15 MWe vehicles with ECCV and MEV; a piloted 5 MWe vehicle with ECCV; a 5 MWe cargo vehicle with 2 MEV's; and a 2.5 MWe vehicle with MEV.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: Nuclear Propulsion Technical Interchange Meeting, Volume 2; p 1085-1094
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    The 20 kWe NEP system studies (1993)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The topics are presented in viewgraph form and include the following: initial study groundrules; power system groundrules/assumptions; power technologies assessment; prototype SP-100 system specific mass; custom SP-100 system specific mass; radiator packaging limits; Brayton system specific mass and radiator area; thermoelectric specific mass and radiator area; specific mass for prototype vs. custom SP-100-based systems; system packaging limits on power level (kWe); and a conceptual nuclear electric propulsion (NEP) science mission spacecraft design.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: Nuclear Propulsion Technical Interchange Meeting, Volume 2; p 798-806
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Multi-reactor configurations for multi-megawatt spacecraft power supplies (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Several conceptual designs for a multimegawatt space nuclear power supply system were developed on the basis of hardware and technology from the existing multihundred kilowatt-class SP-100 reactor program. It is shown that net power outputs in the multimegawatt range can be achieved by using a modular multireactor configuration of several SP-100-derived nuclear power supplies. A variety of geometries were examined for their applicability to the multireactor configuration, showing that modular multireactor systems have the advantage of an increased redundancy in the power system, as compared with a single-reactor system, allowing higher reliabilities than those achievable with single-reactor systems. Results are presented on the Mars Cargo Mission analysis, showing that modularity allows the option of redeployment of power systems in Mars and facilitates refurbishment and turnaround of NEP transfer vehicles.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: AIAA PAPER 90-2111
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Multimegawatt nuclear power systems for nuclear electric propulsion (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Results from systems analysis studies of multimegawatt nuclear power systems are presented for application to nuclear electric propulsion. Specific mass estimates are presented for nearer term SP-100 reactor-based potassium Rankine and Brayton power systems for piloted and cargo missions. Growth SP-100/Rankine systems were found to range from roughly 7 to 10 kg/kWe specific mass depending on full power life requirements. The SP-100/Rankine systems were also found to result in a 4-kg/kWe savings in specific mass over SP-100/Brayton systems. The potential of advanced, higher temperature reactor and power conversion technologies for achieving reduced mass Rankine and Brayton systems was also investigated. A target goal of 5 kg/kWe specific mass was deemed reasonable given either 1400 K potassium Rankine with 1500 K lithium-cooled reactors or 2000 K gas cooled reactors with Brayton conversion.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: AIAA PAPER 91-3607
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Multi-reactor power system configurations for multimegawatt nuclear electric propulsion (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A modular, multi-reactor power system and vehicle configuration for piloted nuclear electric propulsion (NEP) missions to Mars is presented. Such a design could provide enhanced system and mission reliability, allowing a comfortable safety margin for early manned flights, and would allow a range of piloted and cargo missions to be performed with a single power system design. Early use of common power modules for cargo missions would also provide progressive flight experience and validation of standardized systems for use in later piloted applications. System and mission analysis are presented to compare single and multi-reactor configurations for piloted Mars missions. A conceptual design for the Hydra modular multi-reactor NEP vehicle is presented.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: NASA-TM-105212 , E-6607 , NAS 1.15:105212
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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