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  • 1
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    Generalized electrical conductivity relaxation approach to determine electrochemical kinetic properties for MIECs (2016)
    Elsevier
    Details
    Publication Date: 2016-12-01
    Print ISSN: 0167-2738
    Electronic ISSN: 1872-7689
    Topics: Physics
    Published by Elsevier
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    PAPER CURRENT
  • 2
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    Graphene synthesized as by-product of gas purification in long-term space missions and its lithium-ion battery application (2018)
    Elsevier
    Details
    Publication Date: 2018-09-01
    Print ISSN: 0273-1177
    Electronic ISSN: 1879-1948
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Elsevier
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    PAPER CURRENT
  • 3
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    Granular Materials Research at NASA-Glenn (2002)
    In:  CASI
    Details
    Publication Date: 2004-12-14
    Description: This paper presents viewgraphs of granular materials research at NASA-Glenn. The topics include: 1) Impulse dispersion of a tapered granular chain; 2) High Speed Digital Images of Tapered Chain Dynamics; 3) Impulse Dispersion; 4) Three Dimensional Granular Bed Experimental Setup; 5) Magnetic Resonance Imaging of Fluid Flow in Porous Media; and 6) Net Charge on Granular Materials (NCharG).
    Keywords: Nonmetallic Materials
    Type: Sixth Microgravity Fluid Physics and Transport Phenomena Conference: Exposition Topical Areas 1-6; Volume 2; 609- 621; NASA/CP-2002-211212/VOL2
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    RSM 1.0 user's guide: A resupply scheduler using integer optimization (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The Resupply Scheduling Model (RSM) is a PC based, fully menu-driven computer program. It uses integer programming techniques to determine an optimum schedule to replace components on or before a fixed replacement period, subject to user defined constraints such as transportation mass and volume limits or available repair crew time. Principal input for RSJ includes properties such as mass and volume and an assembly sequence. Resource constraints are entered for each period corresponding to the component properties. Though written to analyze the electrical power system on the Space Station Freedom, RSM is quite general and can be used to model the resupply of almost any system subject to user defined resource constraints. Presented here is a step by step procedure for preparing the input, performing the analysis, and interpreting the results. Instructions for installing the program and information on the algorithms are given.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: NASA-TM-104380 , E-6185 , NAS 1.15:104380
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Capillary Flow Experiments Began on the International Space Station (2005)
    In:  CASI
    Details
    Publication Date: 2018-06-05
    Description: The Capillary Flow Experiments (CFEs) are a suite of fluid physics flight experiments designed to investigate capillary flows and phenomena in low gravity. Data obtained from the CFEs will be crucial to NASA s Space Exploration Initiative, particularly pertaining to fluids management systems such as fuels and cryogen storage systems, thermal control systems (e.g., water recycling), and materials processing in the liquid state. NASA s current plans for exploration missions assume the use of larger liquid propellant masses than have ever flown on interplanetary missions. Under low-gravity conditions, capillary forces can be exploited to control fluid orientation so that such large mission-critical systems perform predictably. The first of the CFE experiments has been conducted on the International Space Station, and the data are being analyzed. The experiment suite is described briefly.
    Keywords: Space Processing
    Type: Research and Technology 2004; NASA/TM-2005-213419
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    System performance predictions for Space Station Freedom's electric power system (1993)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Space Station Freedom Electric Power System (EPS) capability to effectively deliver power to housekeeping and user loads continues to strongly influence Freedom's design and planned approaches for assembly and operations. The EPS design consists of silicon photovoltaic (PV) arrays, nickel-hydrogen batteries, and direct current power management and distribution hardware and cabling. To properly characterize the inherent EPS design capability, detailed system performance analyses must be performed for early stages as well as for the fully assembled station up to 15 years after beginning of life. Such analyses were repeatedly performed using the FORTRAN code SPACE (Station Power Analysis for Capability Evaluation) developed at the NASA Lewis Research Center over a 10-year period. SPACE combines orbital mechanics routines, station orientation/pointing routines, PV array and battery performance models, and a distribution system load-flow analysis to predict EPS performance. Time-dependent, performance degradation, low earth orbit environmental interactions, and EPS architecture build-up are incorporated in SPACE. Results from two typical SPACE analytical cases are presented: (1) an electric load driven case and (2) a maximum EPS capability case.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: NASA-TM-106396 , E-8221 , NAS 1.15:106396 , Intersociety Energy Conversion Engineering Conference; Aug 08, 1993 - Aug 13, 1993; Atlanta, GA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Space Station Freedom electrical performance model (1993)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The baseline Space Station Freedom electric power system (EPS) employs photovoltaic (PV) arrays and nickel hydrogen (NiH2) batteries to supply power to housekeeping and user electrical loads via a direct current (dc) distribution system. The EPS was originally designed for an operating life of 30 years through orbital replacement of components. As the design and development of the EPS continues, accurate EPS performance predictions are needed to assess design options, operating scenarios, and resource allocations. To meet these needs, NASA Lewis Research Center (LeRC) has, over a 10 year period, developed SPACE (Station Power Analysis for Capability Evaluation), a computer code designed to predict EPS performance. This paper describes SPACE, its functionality, and its capabilities.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: NASA-TM-106395 , E-8220 , NAS 1.15:106395 , Intersociety Energy Conversion Engineering Conference; Aug 08, 1993 - Aug 13, 1993; Atlanta, GA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    International Space Station (ISS) Bacterial Filter Elements (BFEs): Filter Efficiency and Pressure Drop Testing of Returned Units (2017)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The air quality control equipment aboard the International Space Station (ISS) and future deep space exploration vehicles provide the vital function of maintaining a clean cabin environment for the crew and the hardware. This becomes a serious challenge in pressurized space compartments since no outside air ventilation is possible, and a larger particulate load is imposed on the filtration system due to lack of sedimentation. The ISS Environmental Control and Life Support (ECLS) system architecture in the U.S. Segment uses a distributed particulate filtration approach consisting of traditional High-Efficiency Particulate Air (HEPA) filters deployed at multiple locations in each U.S. Seg-ment module; these filters are referred to as Bacterial Filter Elements, or BFEs. In our previous work, we presented results of efficiency and pressure drop measurements for a sample set of two returned BFEs with a service life of 2.5 years. In this follow-on work, we present similar efficiency, pressure drop, and leak tests results for a larger sample set of six returned BFEs. The results of this work can aid the ISS Program in managing BFE logistics inventory through the stations planned lifetime as well as provide insight for managing filter element logistics for future exploration missions. These results also can provide meaningful guidance for particulate filter designs under consideration for future deep space exploration missions.
    Keywords: Fluid Mechanics and Thermodynamics; Engineering (General); Man/System Technology and Life Support
    Type: GRC-E-DAA-TN44455 , International Conference on Environmental Systems; Jul 16, 2017 - Jul 20, 2017; Charleston, SC; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Development of a Multi-Stage Filter System for Cabin Ventilation Systems on the ISS and Future Deep Space Missions (2018)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The National Aeronautics and Space Administration's (NASA's) deep space exploration missions will be of significant duration requiring long-life and reliably performing spacecraft cabin ventilation filters. A particulate filter system is being developed at NASA Glenn Research Center (GRC) to meet the challenges of these remote and long duration missions. The capabilities and features of the filter system are expected to expand the life and reduce the maintenance requirements over that of the current ISS (International Space Station) filter by providing pre-filtration stages with novel self-cleaning and regenerable techniques. The filter provides two regenerable pre-filtration stages using a screen mesh media and an impactor collection system, and also provides intermediate stage filtration employing self-replacing filter media. The filter system is also designed to be compatible with the interfaces and performance requirements of the ISS distributed ventilation architecture in the US modules to facilitate testing on ISS type test or mock up platforms. Currently, a prototype of the filter system is undergoing tests in a custom configured filter test stand at the NASA GRC. The test stand provides the same range of flow rates produced on the ISS distributed architecture, and is equipped and instrumented to perform filter tests based on industrial test standards. The test stand has been used successfully to perform filter and flow performance test on returned ISS Bacterial Filter Elements. Similar test protocols were used to characterize the performance of the current filter system. Different performing grades of filter media will be installed and tested on the filter system, and different test particle standards will be used to simulate the range of particulate matter particles and debris the filter will see during a mission. This paper will present results and analysis of the test data to guide and provide input to the next generation filter system.
    Keywords: Man/System Technology and Life Support
    Type: GRC-E-DAA-TN56966 , International Conference on Environmental Systems (ICES 2018); Jul 08, 2018 - Jul 12, 2018; Albuquerque, NM; United States
    Format: application/pdf
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  • 10
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    Advanced Manifolds for Improved Solid Oxide Electrolyzer Performance (2018)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: An investigation was conducted to see if additive manufacturing could be used to fabricate more efficient manifold designs for improved flow, reduced stresses, and decreased number of joints to be sealed for a solid oxide electrolyzer used to convert carbon dioxide to oxygen. Computational flow and mechanical modeling were conducted on a NASA Glenn Research Center patented cell and stack design with the potential to achieve a 3-4 times mass reduction. Various manifold designs were modeled, and two were downselected to be fabricated and tested. Some benefit was seen in a baffled manifold design, which directed incoming flow more effectively into the flow channels, compared to the original design, where the flow spent more time within the manifold itself. Flow measurements indicated some non-uniformity of flow across the channels at higher flow rates, which were not predicted by the model. Some possible explanations for the differences are discussed.
    Keywords: Spacecraft Propulsion and Power
    Type: GRC-E-DAA-TN60277 , Space 2018; Sep 17, 2018 - Sep 19, 2018; Orlando, Florida; United States
    Format: application/pdf
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