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  • Inorganic Chemistry  (7)
  • 72.40  (3)
  • STRUCTURAL MECHANICS  (3)
  • Spacecraft Design, Testing and Performance  (2)
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  • 1
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    Unknown
    Man's flight in space (1964)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Apollo project - progress and national benefits
    Keywords: STRUCTURAL MECHANICS
    Type: Proceedings of the Fourth National Conference on the Peaceful Uses of Space; NASA-SP-51
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Structural mechanics of deformation and fracture Quarterly progress report (1966)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Structural mechanics of deformation and fracture - responses of model viscoelastic materials to impact
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-80918
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    CFRP Dimensional Stability Investigations for Use on the LISA Mission Telescope (2011)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: The Laser Interferometer Space Antenna (LISA) is a mission designed to detect low frequency gravitational-waves. In order for LISA to succeed in its goal of direct measurement of gravitational waves, many subsystems must work together to measure the distance between proof masses on adjacent spacecraft. One such subsystem, the telescope, plays a critical role as it is the laser transmission and reception link between spacecraft. Not only must the material that makes up the telescope support structure be strong, stiff and light, but it must have a dimensional stability of better than 1 pm Hz(exp -1/2) at 3 mHz and the distance between the primary and the secondary mirrors must change by less than 2.5 micron over the mission lifetime. CFRP is the current baseline materiaL however, it has not been tested to the pico-meter level as required by the LISA mission. In this paper we present dimensional stability results, outgassing effects occurring in the cavity and discuss its feasibility for use as the telescope spacer for the LISA spacecraft.
    Keywords: Spacecraft Design, Testing and Performance
    Type: GSFC.JA.5667.2011
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Analog study of the dynamics of a nonlinear Maxwell model material. (1966)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Mechanical behavior of materials with temperature dependent viscosity, using electric analogy on nonlinear Maxwell model
    Keywords: STRUCTURAL MECHANICS
    Type: ; ACE(
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    LISA Telescope Spacer Design Issues (2010)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The LISA mission observes gravitational waves by measuring the separations between freely floating proof masses located 5 million kilometers apart with an accuracy of - 10 picometers. The separations are measured interferometrically. The telescope is an afocal Cassegrain style design with a magnification of 80x. The entrance pupil has a 40 cm diameter and will either be centered on-axis or de-centered off-axis to avoid obscurations. Its two main purposes are to transform the small diameter beam used on the optical bench to a diffraction limited collimated beam to efficiently transfer the metrology laser between spacecraft, and to receive the incoming light from the far spacecraft. It transmits and receives simultaneously. The basic optical design and requirements are well understood for a conventional telescope design for imaging applications, but the LISA design is complicated by the additional requirement that the total optical path through the telescope must remain stable at the picometer level over the measurement band during the mission to meet the measurement accuracy. We describe the mechanical requirements for the telescope and the preliminary work that has been done to understand the materials and mechanical issues associated with the design of a passive metering structure to support the telescope and to maintain the spacing between the primary and secondary mirrors in the LISA on-orbit environment. This includes the requirements flowdown from the science goals, thermal modeling of the spacecraft and telescope to determine the expected temperature distribution, layout options for the telescope including an on- and off-axis design. Plans for fabrication and testing will be outlined.
    Keywords: Spacecraft Design, Testing and Performance
    Type: 8th International LISA Symposium; Jun 28, 2010 - Jul 02, 2010; Stanford, CA; United States
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    NASA TECHNICAL REPORTS
  • 6
    Electronic Resource
    Electronic Resource
    The effect of H-dilution on the transport properties of doped a-Si1−x Ge x : H alloys (1989)
    Springer
    Applied physics 49 (1989), S. 165-169 
    Details
    ISSN: 1432-0630
    Keywords: 72.20 ; 72.40 ; 73.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract This paper is concerned with the optimization of growth conditions for a-Si1-x Ge x :H alloys. It is shown that H-dilution of source gases selectively improves the band transport of electrons without significantly affecting the recombination center density or the band transport of holes. It is further shown that the beneficial effects of H-dilution are most pronounced in alloys with comparable densities of Si and Ge.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00616295
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  • 7
    Electronic Resource
    Electronic Resource
    The electrical performance of thinn +-window layers ina-Si: H solar cells (1982)
    Springer
    Applied physics 29 (1982), S. 63-68 
    Details
    ISSN: 1432-0630
    Keywords: 72.40 ; 73 ; 85 ; 60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The electrical properties ofn +-window layers inp-i-n a-Si:H solar cells were characterised as a function ofn +-layer thickness, $$d_{n^ + } $$ , by measuring firstly the activation energyE a of the dark conductivity and secondly the built-in potentialV bi of the cells.E a was found to increase with decreasing $$d_{n^ + } $$ attaining values as high as 0.8 eV for $$d_{n^ + } $$ ≅5nm; bulk values, e.g.E a ≅. 2eV in the amorphous andE a〈0.01 eV in the microcrystalline case, were only observed for $$d_{n^ + } $$ 〉20nm and for $$d_{n^ + } $$ 〉200nm, respectively. In contrast,V bi did not depend on $$d_{n^ + } $$ at all and was further found to be consistent with expectations based on the Fermi level positions in bulkn + andp +-material. As a consequenceE a in very thin films can no longer be considered as a measure of (E C −E F), the distance of the Fermi level from the conduction band edge. The apparent inconsistency inherent to theE a and theV bi results can be resolved by assuming that the deposition of then +-material proceeds via the growth and coalescence of small islands.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00632427
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  • 8
    Electronic Resource
    Electronic Resource
    Surface and volume decay processes in semiconductors studied by contactless transient photoconductivity measurements (1988)
    Springer
    Applied physics 46 (1988), S. 77-85 
    Details
    ISSN: 1432-0630
    Keywords: 72.40 ; 73.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Excess charge carrier kinetics in moderately doped pSi wafers were investigated with a contactless transient photoconductivity method, i.e. the time-resolved microwave conductivity (TRMC) method. The surface structure of the wafers was changed by etching and polishing, the volume structure by irradiation with high-energy electrons. Comparison of the photoconductivity decay after excitation by strongly absorbed light and by weakly absorbed light was used to distinguish between surface and volume decay processes. The experimental results deviate from predictions based on a linear surface decay rate. These results are discussed and suggestions are made for the use of transient photoconductivity measurements to characterize semiconductor wafers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00615912
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  • 9
    Electronic Resource
    Electronic Resource
    Über Versuche zur Drucksynthese von HexachlorotitanatenProfessor Georg Brauer zum 60. Geburtstage gewidmet (1968)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 357 (1968), S. 172-176 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Experiments for preparing hexachlorotitanates by reaction of TiCl4 with alkali chlorides or calcium chloride in pressure bombs at 550-750°C are described. Pure K2TiCl6 and Cs2TiCl6 were obtained, whereas the reaction products from LiCl, NaCl and CaCl2 contained not more than 4 to 6.5 weight per cent of titanium. A content of up to 0.24 weight per cent trivalent titanium is found at higher temperatures resulting from evolution of elemental chlorine from the titanium tetrachloride.
    Notes: Es werden Versuche zur Darstellung von Hexachlorotitanaten aus TiCl4 und Alkalichlorid oder Calciumchlorid in Druckbomben bei Temperaturen von 550-750°C beschrieben. K2TiCl6 und Cs2TiCl6 können dabei rein und wasserfrei erhalten werden, während mit LiCl, NaCl und CaCl2 nur Produkte mit Titangehalten von max. 4 bis 6,5 Gew.-% entstehen. Mit steigender Versuchstemperatur treten in den Präparaten durch Cl2-Abspaltung aus dem TiCl4 entstandene Gehalte an dreiwertigem Titan auf, die bis zu 0,24 Gew.-% betragen können.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19683570403
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  • 10
    Electronic Resource
    Electronic Resource
    Koordinationschemische Untersuchungen an Zinkdialkylen. XIV. Über Lithium- und Zink-3-(N, N-dialkylamino)-propyl-Verbindungen (1980)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 462 (1980), S. 152-158 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Investigations on the Coordination Chemistry of Zinc Dialkyls. XIV. On Lithium and Zinc 3(N, N-Dialkylamino)propyl CompoundsIt is reported on synthesis and properties of organo lithium compounds of the type [R2NCH2CH2CH2Li]n. The structure is proposed by reason of molecular weight determination and 13C-NMR spectra.In dependence of the molar ratio the lithium dialkylamino propyls and the corresponding Grignard reagents react with zinc chloride forming dimer alkyl zinc chlorides [R2NCH2CH2CH2ZnCl]2 or monomer spiranoide chelate complexes of the formula [R2NCH2CH2CH2]2Zn (R = CH3, C2H5).
    Notes: Es wird über die Synthese und die Eigenschaften von Organolithium-verbindungen des Typs [R2NCH2CH2CH2Li]n berichtet und ein Strukturvorschlag aufgrund von Molmassebestimmungen und 13C-NMR-Spektren unterbreitet.Die Lithium-dialkylaminopropyle sowie die entsprechenden Grignardverbindungen reagieren mit Zinkchlorid je nach Molverhältnis der Reaktionspartner zu dimeren Alkylzinkchloriden [R2NCH2CH2CH2ZnCl]2 bzw. monomeren, teilweise schon bekannten, spiranoiden Innerkomplexen der Formel [R2NCH2CH2CH2]2Zn (R = CH3. C2H5).
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19804620116
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