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  • 1
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    De novo variants in congenital diaphragmatic hernia identify MYRF as a new syndrome and reveal genetic overlaps with other developmental disorders (2018)
    Public Library of Science
    Details
    Publication Date: 2018-12-10
    Print ISSN: 1553-7390
    Electronic ISSN: 1553-7404
    Topics: Biology
    Published by Public Library of Science
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    PAPER CURRENT
  • 2
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    Characterization of metal oxide absorbents for regenerative carbon dioxide and water vapor removal for advanced portable life support systems (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Characterization of the performance of a silver-oxide-based absorbent in terms of its ability to remove both gaseous CO2 and water vapor in an astronaut portable life support systems (PLSS) is discussed. Attention is focused on regeneration of the absorbent from the carbonite state of the oxide state, preconditioning of the absorbent using a humidified gas stream, and absorption breakthrough testing. Based on the results of bench-scale experiments, a test plan is carried out to further characterize the silver-oxide-based absorbent on a larger scale; it calls for examination of the absorbent in both an adiabatic packed bed and a near-isothermal cooled bed configuration. It is demonstrated that the tested absorbent can be utilized in a way that removes substantial amounts of CO2 and water vapor during an 8-hour extravehicular activity mission, and that applying the absorbent to PLSS applications can simplify the ventilation loop.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: SAE PAPER 901431
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Development of a regenerable metal oxide CO removal system (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A regenerable metal oxide carbon dioxide (CO2) removal system was developed to replace the current means of a nonreusable chemical, lithium hydroxide, for removing the metabolic CO2 of an astronaut in a space suit. Testing indicates that a viable low-volume metal oxide concept can be used in the portable life support system for CO2 removal during Space Station extravehicular activity (EVA). A canister of nearly the same volume as that used for the Space Shuttle, containing 0.10 cu ft of silver-oxide-based pellets, was tested; test data analysis indicates that 0.18 cu ft of the metal oxide will result in an 8-hour EVA capability. The testing suggests that the metal oxide technology offers a low-volume approach for a reusable CO2 removal concept applicable for at least 40 EVA missions. The development and testing of the breadboard regeneration package is also described.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: SAE PAPER 901430
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Carbon dioxide electrolysis with solid oxide electrolyte cells for oxygen recovery in life support systems (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The direct electrochemical reduction of carbon dioxide (CO2) is achieved without catalysts and at sufficiently high temperatures to avoid carbon formation. The tubular electrolysis cell consists of thin layers of anode, electrolyte, cathode and cell interconnection. The electrolyte is made from yttria-stabilized zirconia which is an oxygen ion conductor at elevated temperatures. Anode and cell interconnection materials are complex oxides and are electronic conductors. The cathode material is a composite metal-ceramic structure. Cell performance characteristics have been determined using varying feed gas compositions and degrees of electrochemical decomposition. Cell test data are used to project the performance of a three-person CO2-electrolysis breadboard system.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: SAE PAPER 881040
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Development of a regenerable humidity and CO2 control system for an advanced EMU (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A 5-h-regenerable nonventing humidity and CO2 control subsystem (HCCS) technology demonstration unit is being developed for potential use in an Advanced Extravehicular Mobility Unit for Space Station application. The HCCS incorporates a weak-base-anion exchange resin packed in a metal-foam-matrix heat exchanger. This system simultaneously removes CO2 and water vapor, with the resulting exothermic heat of reaction rejected to the heat exchanger. The system has no moving parts, resulting in a highly reliable simple configuration. Regeneration may be accomplished via internal heating and vacuum.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: SAE PAPER 871471
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Metal oxide regenerable carbon dioxide removal system for an advanced portable life support system (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The development of a CO2 removal system for an astronaut portable life support system to meet the EVA requirements for the Space Station is discussed, focusing on the factors important in the selection of the metal oxide absorbent for CO2 removal. Results from laboratory tests on metal oxide absorbent materials are given, including characterization studies and dynamic CO2 uptake and regeneration measurements. The preliminary design of the breadboard system to perform both the absorption and regeneration functions is presented.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: SAE PAPER 891595
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Development of an advanced solid amine humidity and CO2 control system for potential Space Station Extravehicular Activity application (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A system for removing metabolic carbon dioxide and water vapor from breathing air within a space suit during NASA Space Station EVA is discussed. The solid amine compound used is packed within a water-cooled metal foam matrix heat-exchanger to remove the exothermic heat of chemical reaction. Details of the design of a canister for humidity and carbon dioxide control and performance of the system are presented.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: SAE PAPER 881062
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    An advanced carbon reactor subsystem for carbon dioxide reduction (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: An evaluation is presented of the development status of an advanced carbon-reactor subsystem (ACRS) for the production of water and dense, solid carbon from CO2 and hydrogen, as required in physiochemical air revitalization systems for long-duration manned space missions. The ACRS consists of a Sabatier Methanation Reactor (SMR) that reduces CO2 with hydrogen to form methane and water, a gas-liquid separator to remove product water from the methane, and a Carbon Formation Reactor (CFR) to pyrolize methane to carbon and hydrogen; the carbon is recycled to the SMR, while the produce carbon is periodically removed from the CFR. A preprototype ACRS under development for the NASA Space Station is described.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: SAE PAPER 860995
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Design of an oxygen sensor with automatic self-testing and calibration capability (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Future long duration manned space missions require a reliable sensor to monitor cabin oxygen (O2) pressure. This paper presents a concept for a solid zirconia O2 sensor capable of automatic self-test and calibration without the need for consumable materials. The operation and the techniques used to verify proper performance and to calibrate the sensor are described. Coulometric measurements are used to calculate the cabin O2 pressure without comparison to any reference state; potentiometric measurements are simple and reliable. The use of independent measurements permits the verification of results obtained with either technique. The design includes fault diagnostics which takes corrective action if a fault occurs.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: SAE PAPER 860919
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Design of a water electrolysis flight experiment (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Supply of oxygen (O2) and hydrogen (H2) by electolyzing water in space will play an important role in meeting the National Aeronautics and Space Administration's (NASA's) needs and goals for future space missios. Both O2 and H2 are envisioned to be used in a variety of processes including crew life support, spacecraft propulsion, extravehicular activity, electrical power generation/storage as well as in scientific experiment and manufacturing processes. The Electrolysis Performance Improvement Concept Study (EPICS) flight experiment described herein is sponsored by NASA Headquarters as a part of the In-Space Technology Experiment Program (IN-STEP). The objective of the EPICS is to further contribute to the improvement of the SEF technology, specifially by demonstrating and validating the SFE electromechanical process in microgravity as well as investigating perrformance improvements projected possible in a microgravity environment. This paper defines the experiment objective and presents the results of the preliminary design of the EPICS. The experiment will include testing three subscale self-contained SFE units: one containing baseline components, and two units having variations in key component materials. Tests will be conducted at varying current and thermal condition.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: SAE PAPER 932087 , SAE, International Conference on Environmental Systems; Jul 12, 1993 - Jul 15, 1993; Colorado Springs, CO; United States|(ISSN 0148-7191); 14 p.
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    NASA TECHNICAL REPORTS
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