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  • 1
    Electronic Resource
    Electronic Resource
    Comparisons among some tetraalkoxysilanes in the hydrolytic precipitation of silica into elastomeric networks (1986)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 187 (1986), S. 2861-2866 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Four tetraalkoxysilanes Si(OR)4 were absorbed into networks of polydimethylsiloxane and then hydrolyzed, using a variety of catalysts, to give reinforcing silica particles. On the basis of the amount of silica precipitated and the extent of reinforcement, the (decreasing) order of effectiveness was found to be tetraethoxysilane, tetrapropoxysilane, tetrabutoxysilane, and tetramethoxysilane.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1986.021871213
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Oxalato- and Malonato-complexes of trivalent metals. II. Stabilities of Tris-oxalato Complexes of Iron, Chromium, Aluminium, and Gallium (1957)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 293 (1957), S. 195-203 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The stabilities of tris-oxalato complexes of trivalent metals like Fe, Cr, Al, Ga have been studied. These compounds have been found to decompose in steps by interaction with acids. The stepwise instability constants and also the overall instability constants of the reactions MOx3‴ → MOx′2 + Ox″, MOx′2 → MOx+ + Ox″, MOx+ → M3+ + Ox″ and MOx3‴ → M3+ + 3 Ox″ have been measured.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19572930307
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Yttrium(III) oxoisopropoxide: A new synthetic route and reinvestigation of the 1H, 13C and 89Y NMR of Y5(μ5-O)(μ3-OiPr)4(μ2-OiPr)4(O iPr)5 (1991)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 29 (1991), S. 1191-1195 
    Details
    ISSN: 0749-1581
    Keywords: Yttrium(III) oxoisopropoxide ; 1H NMR ; 13C NMR ; 89Y NMR ; Proton T1 ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Yttrium(III) oxoisopropoxide, Y5O(OiPr)13, was synthesized via a new synthetic route and characterized by mass spectrometry and multinuclear magnetic resonance spectroscopic techniques. Extensive 1H, 13C and 89Y NMR studies with full assignments are reported.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260291206
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    Paper (German National Licenses)
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  • 4
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    Modeling of Space Station power system components and their interactions (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The authors demonstrate that the functional modeling approach is feasible in modeling large-scale spacecraft power systems such as the Space Station electric power system (EPS). The functional models for the solar array sequential shunt unit and the battery charging/discharging unit are presented. The functional modeling approach has also been applied to simulate other major EPS components. The usefulness of this approach in system-level studies has been demonstrated by incorporating these models into a power system model and simulating the system behavior under various conditions. The simulation results are consistent with those obtained experimentally. With larger time step size and reduced model complexity, the computation time required by the functional modeling approach is short. Functional models are effective in simulation studies of system-level issues, especially for large-scale power systems including many power electronic components.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: IECEC ''91: Intersociety Energy Conversion Engineering Conference; Aug 04, 1991 - Aug 09, 1991; Boston, MA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Modeling of Space Station electric power system with EMTP (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The authors provide an introduction to using the electromagnetic transients (EMTP) program to model aerospace power system components. A brief general overview of EMTP is presented. The modeling of the dc/dc converter unit in the space station electric power system is described as an illustration.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: Intersociety Energy Conversion Engineering Conference; Aug 12, 1990 - Aug 17, 1990; Reno, NV; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    An EMTP system level model of the PMAD DC test bed (1991)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A power management and distribution direct current (PMAD DC) test bed was set up at the NASA Lewis Research Center to investigate Space Station Freedom Electric Power Systems issues. Efficiency of test bed operation significantly improves with a computer simulation model of the test bed as an adjunct tool of investigation. Such a model is developed using the Electromagnetic Transients Program (EMTP) and is available to the test bed developers and experimenters. The computer model is assembled on a modular basis. Device models of different types can be incorporated into the system model with only a few lines of code. A library of the various model types is created for this purpose. Simulation results and corresponding test bed results are presented to demonstrate model validity.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: NASA-TM-104515 , E-6384 , NAS 1.15:104515 , Intersociety Energy Conversion Engineering Conference; Aug 04, 1991 - Aug 09, 1991; Boston, MA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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