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  • MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT  (4)
  • LexA/RecA  (1)
  • Polymer and Materials Science  (1)
  • [1.1]ferrocenophane  (1)
  • 1
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    Mathematical modeling of control subsystems for CELSS: Application to diet (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The dynamic control of a Closed Ecological Life Support System (CELSS) in a closed space habitat is of critical importance. The development of a practical method of control is also a necessary step for the selection and design of realistic subsystems and processors for a CELSS. Diet is one of the dynamic factors that strongly influences, and is influenced, by the operational states of all major CELSS subsystems. The problems of design and maintenance of a stable diet must be obtained from well characterized expert subsystems. The general description of a mathematical model that forms the basis of an expert control program for a CELSS is described. The formulation is expressed in terms of a complete set of time dependent canonical variables. System representation is dynamic and includes time dependent storage buffers. The details of the algorithm are described. The steady state results of the application of the method for representative diets made from wheat, potato, and soybean are presented.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: ESA, 4th European Symposium on Space Environmental Control Systems, Volume 1; p 501-505
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Impact of diet on the design of waste processors in CELSS (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The preliminary results of a design analysis for a waste processor which employs existing technologies and takes into account the constraints of human diet are presented. The impact of diet is determined by using a model and an algorithm developed for the control and management of diet in a Controlled Ecological Life Support System (CELSS). A material and energy balance model for thermal oxidation of waste is developed which is consistent with both physical/chemical methods of incineration and supercritical water oxidation. The two models yield quantitative analysis of the diet and waste streams and the specific design parameters for waste processors, respectively. The results demonstrate that existing technologies can meet the demands of waste processing, but the choice and design of the processors or processing methods will be sensitive to the constraints of diet. The numerical examples are chosen to display the nature and extent of the gap in the available experiment information about CELSS requirements.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: ESA, 4th European Symposium on Space Environmental Control Systems, Volume 2; p 817-821
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Options for transpiration water removal in a crop growth system under zero gravity conditions (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The operation of a microgravity crop-growth system is a critical feature of NASA's Closed Ecological Life Support System (CELSS) development program. Transpiration-evolved water must be removed from the air that is recirculated in such a system, perhaps supplying potable water in the process. The present consideration of candidate systems for CELSS water removal gives attention to energy considerations and to a mechanical, inertial-operation water-separation system that was chosen due to the depth of current understanding of its operation.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: SAE PAPER 911423 , International Conference on Environmental Systems; Jul 15, 1991 - Jul 18, 1991; San Francisco, CA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Diet expert subsystem for CELSS (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: An account is given of the mathematical basis of a diet-controlling expert system, designated 'Ceres' for the human crews of a Controlled Ecological Life Support System (CELSS). The Ceres methodology can furnish both steady-state and dynamic diet solutions; the differences between Ceres and a conventional nutritional-modeling method is illustrated by the case of a three-component, potato-wheat-soybean food system. Attention is given to the role of food processing in furnishing flexibility in diet-planning management. Crew diet solutions based on simple optimizations are not necessarily the most suitable for optimum CELSS operation.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: SAE PAPER 911424 , International Conference on Environmental Systems; Jul 15, 1991 - Jul 18, 1991; San Francisco, CA; United States
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    NASA TECHNICAL REPORTS
  • 5
    Electronic Resource
    Electronic Resource
    Expression of synthetic genes encoding fused proteins under tight control of modified regulatory regions of the colicin operon
    Amsterdam : Elsevier
    Gene 117 (1992), S. 7-14 
    Details
    ISSN: 0378-1119
    Keywords: LexA/RecA ; Protein fusion and stabilization ; SOS response ; connective tissue-activating peptide-III ; hirudin ; laminin fragment ; neutrophil-activating protein ; platelet factor 4 ; specific radiolabeling ; β-thromboglobulin
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0378-1119(92)90483-6
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Electronic structure, geometry, and energetics of carbanion and carbocation of [1.1]ferrocenophane: An INDO study (1984)
    Springer
    Theoretical chemistry accounts 65 (1984), S. 167-177 
    Details
    ISSN: 1432-2234
    Keywords: INDO ; [1.1]ferrocenophane ; carbanion of ; carbocation of ; hydrogen bonding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract INDO-SCF calculations with constrained geometry optimization have been performed to determine the bridge geometries in [1.1]ferrocenophane and its carbocation and carbanion to address the question of possible C-H-C hydrogen bonding in the carbanion derivative. In the equilibrium geometry of the carbanion, the endo-hydrogen is bonded to one of the bridge carbon atoms and the calculated distance between the two bridge carbons seems too large to accommodate a stable C-H-C hydrogen bond. The results indicate that the observed proton NMR spectrum of carbanion should be interpreted in terms of rapid proton exchange between two bridge carbon atoms rather than a symmetric hydrogen bond. The ground state charge distributions show that the ionic bridges in both carbanion and carbocation are highly conjugated and most of the ionic charge in both molecules is distributed over the ferrocene ring system. The charge on the iron varies only slightly among the three molecules and the formal oxidation state of iron remains +2. The role of the iron seems to be that of a conduit for charge transfer between ferrocene rings upon conjugation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00551330
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Excited electronic states of the ethidium cation (1976)
    New York : Wiley-Blackwell
    Biopolymers 15 (1976), S. 1637-1640 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1976.360150816
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