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  • Physics  (11)
  • Man/System Technology and Life Support  (5)
  • CHEMISTRY AND MATERIALS (GENERAL)  (2)
  • 1
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    Hydrogen and advanced aerospace materials (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The hydrogen embrittlement is briefly reviewed and discussed in terms of specific structural materials considered for use on a generic, hydrogen-fueled, hypersonic aerospace vehicle. A few unusual hydrogen-material incompatibility concerns are identified and some solution methodologies are discussed that could potentially lessen these concerns.
    Keywords: CHEMISTRY AND MATERIALS (GENERAL)
    Type: SAMPE Quarterly (ISSN 0036-0821); 20; 20-23
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Hydrogen environment effects on advanced alloys and composites in aerospace structures (1990)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The known effects of hydrogen-containing environments on the mechanical behavior of advanced, titanium based materials presently being considered for advanced, aerospace, structures applications are discussed. It is shown that although some understanding has been developed over the past three years, much remains to be developed. Most data of the data strongly suggest that titanium-based alloys should not be used in thermal structures exposed to most elevated temperature, hydrogen-containing environments.
    Keywords: CHEMISTRY AND MATERIALS (GENERAL)
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Plants in space (2002)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: Virtually all scenarios for the long-term habitation of spacecraft and other extraterrestrial structures involve plants as important parts of the contained environment that would support humans. Recent experiments have identified several effects of spaceflight on plants that will need to be more fully understood before plant-based life support can become a reality. The International Space Station (ISS) is the focus for the newest phase of space-based research, which should solve some of the mysteries of how spaceflight affects plant growth. Research carried out on the ISS and in the proposed terrestrial facility for Advanced Life Support testing will bring the requirements for establishing extraterrestrial plant-based life support systems into clearer focus.
    Keywords: Man/System Technology and Life Support
    Type: Current opinion in plant biology (ISSN 1369-5266); Volume 5; 3; 258-63
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Advanced Plant Habitat (APH) (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The Advanced Plant Habitat (APH) hardware will be a large growth volume plant habitat, capable of hosting multigenerational studies, in which environmental variables (e.g., temperature, relative humidity, carbon dioxide level light intensity and spectral quality) can be tracked and controlled in support of whole plant physiological testing and Bio-regenerative Life Support System investigations.
    Keywords: Man/System Technology and Life Support
    Type: SP-2015-07-289-KSC , KSC-E-DAA-TN30973 , Space Symposium; Apr 11, 2016 - Apr 14, 2016; Colorado Springs, CO; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Early Prototype Development of the Passive Orbital Nutrient Delivery System (PONDS) (2019)
    In:  CASI
    Details
    Publication Date: 2019-11-30
    Description: Long-duration space missions will eventually require a fresh food supply to supplement crew diets, which means growing crops in space. The Passive Orbital Nutrient Delivery System (PONDS) is a new plant growth approach that contains both an area for a contained substrate and a reservoir for water and/or plant nutrient solutions. Ground studies have shown that the system facilitates both reliable water delivery to seeds for germination (e.g., while avoiding overwatering), and transport of water from the reservoir for improved plant growth while providing nutrients and oxygen to the root zone. In ground prototypes a capillary mat wicking material passively links the water/nutrient solution reservoir to a removable rooting module containing a substrate adapted to support plant growth. Oxygen permeable membranes are incorporated into both the reservoir walls and the rooting modules, bringing in oxygen from outside of the system into the reservoir and then into the rooting modules where the plant roots proliferate. Water is delivered from the reservoir to the substrate contained within the rooting module through the use of wicking material inserted into the plant growth substrate both from the bottom and from the sides of the rooting module. The capillary mat material is intrinsically hydrophilic and continuously wicks water to the substrate throughout the plant growth interval. The system is therefore self-watering in terms of supplying water to the root zone encompassed within the rooting module on demand. At the top, a hydrophilic phenolic foam plug surrounds the wick in the seed insertion zone, and both contains the substrate within the rooting module, and facilitates removal of excess moisture from the capillary mat wick before it can encompass seeds prior to germination. This work is supported by NASAs Space Life and Physical Sciences and Research Applications Division (SLPSRAD).
    Keywords: Man/System Technology and Life Support
    Type: KSC-E-DAA-TN69736 , American Society for Gravitational and Space Research (ASGSR) Meeting; Nov 20, 2019 - Nov 23, 2019; Denver, CO; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Advanced Spacesuit Portable Life Support System Packaging Concept Mock-Up Design & Development (1998)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A concentrated development effort was begun at NASA Johnson Space Center to create an advanced Portable Life Support System (PLSS) packaging concept. Ease of maintenance, technological flexibility, low weight, and minimal volume are targeted in the design of future micro-gravity and planetary PLSS configurations. Three main design concepts emerged from conceptual design techniques and were carried forth into detailed design, then full scale mock-up creation. "Foam", "Motherboard", and "LEGOtm" packaging design concepts are described in detail. Results of the evaluation process targeted maintenance, robustness, mass properties, and flexibility as key aspects to a new PLSS packaging configuration. The various design tools used to evolve concepts into high fidelity mock ups revealed that no single tool was all encompassing, several combinations were complimentary, the devil is in the details, and, despite efforts, many lessons were learned only after working with hardware.
    Keywords: Man/System Technology and Life Support
    Type: 99-ES-161 , ICES; Jul 01, 1999; Denver, CO; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Vegetable Production System (Veggie) (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The Vegetable Production System (Veggie) was developed by Orbital Technologies Corp. to be a simple, easily stowed, and high growth volume yet low resource facility capable of producing fresh vegetables on the International Space Station (ISS). In addition to growing vegetables in space, Veggie can support a variety of experiments designed to determine how plants respond to microgravity, provide real-time psychological benefits for the crew, and conduct outreach activities. Currently, Veggie provides the largest volume available for plant growth on the ISS.
    Keywords: Man/System Technology and Life Support
    Type: SP-2015-11-435-KSC , KSC-E-DAA-TN30929 , Space Symposium; Apr 11, 2016 - Apr 14, 2016; Colorado Springs, CO; United States
    Format: application/pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Adsorption of polymers at the solution-solid interface. VII. Poly(acrylic acids), model compounds, and vapors on nylon fibers (1972)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 10 (1972), S. 1013-1022 
    Details
    ISSN: 0449-2978
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Nylon fibers of various draw ratios have been used as the adsorbents in the adsorption of low molecular weight acids and of polyacrylic acids from solution. Polymer adsorption is lower than on a precipitated nylon and decreases with fiber orientation; however, propionic acid and glutaric acids do not show this dependence on nylon structure. The structural alterations consequent on fiber drawing also reduce swelling in hydroxylated liquids. The greater accessibility of the precipitated nylon is shown by vapor sorption and extends to nonhydroxylated vapors; however, the differences in behavior between polyamide powder and fiber cannot be fully attributed to the former possessing a porous structure, in the sense normally employed in surface chemistry.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1972.160100605
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  • 9
    Electronic Resource
    Electronic Resource
    Adsorption of polymers at the solution-solid interface. VIII. Competitive effects in the adsorption of polystyrenes on silica (1972)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 10 (1972), S. 1023-1028 
    Details
    ISSN: 0449-2978
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The adsorption behavior on silica of some polystrenes of moderate molecular weight distribution, both singly and in mixtures, has been examined. The adsorption isotherms indicate that, in both a good solvent (trichloroethylene) and under theta conditions, the species of higher molecular weight is preferentially adsorbed at or near full surface coverage, but that the smaller adsorbate has an improved opportunity for adsorption at low surface coverage. The use of tritiated adsorbates substantiate the isotherm data in cyclohexane solution.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1972.160100606
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  • 10
    Electronic Resource
    Electronic Resource
    Adsorption of polymers at the solution-solid interface. V. Styrene-methyl methacrylate copolymers on carbon (1971)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 9 (1971), S. 841-852 
    Details
    ISSN: 0449-2978
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The adsorption of a series of block and random styrene-methyl methacrylate copolymers on an animal charcoal and on Graphon has been studied. On charcoal, adsorption decreases with increase of molecular weight because of the inability of larger coils to penetrate into the adsorbent. An analysis is presented which requires that coils undergo considerable distortion on adsorption in pores. The adsorption of random copolymers on Graphon is also in reverse order of molecular weight; this effect may be due to particle bridging leading to the formation of interparticle “pores.” The relative affinity of the styrene and methyl methacrylate residues is different on charcoal and Graphon, respectively; on both surfaces, however, relatively few of the more active residues are required for adsorption. Block and random copolymers are adsorbed to different extents which depend on the nature of the adsorbent surface.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1971.160090506
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