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  • Chemistry  (40)
  • 72.80N  (2)
  • Spacecraft Design, Testing and Performance  (2)
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  • 1
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    CFRP Dimensional Stability Investigations for Use on the LISA Mission Telescope (2011)
    In:  CASI
    Details
    Publikationsdatum: 2019-07-12
    Beschreibung: 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.
    Schlagwort(e): Spacecraft Design, Testing and Performance
    Materialart: GSFC.JA.5667.2011
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 2
    facet.materialart.
    Unbekannt
    LISA Telescope Spacer Design Issues (2010)
    In:  CASI
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: 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.
    Schlagwort(e): Spacecraft Design, Testing and Performance
    Materialart: 8th International LISA Symposium; Jun 28, 2010 - Jul 02, 2010; Stanford, CA; United States
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 3
    Digitale Medien
    Digitale Medien
    Doping efficiencies of gas-phase and ion-implantation doped a-Si:H (1986)
    Springer
    Applied physics 41 (1986), S. 253-258 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 72.80N
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract We compare the electronic properties of gas-phase and implantation doped a-Si:H films and analyze their properties within the framework of Street's auto-compensation model [1]. We find that this model can consistently explain the varying degrees of sensitivity with respect to doping for differently prepared a-Si:H materials. In agreement with sub-band-gap absorption data our analysis indicates that the density of native dangling bond defects is increased when the film thickness is decreased and when thin films are further subjected to ion bombardment. Considering the temperature dependence of conductivity, we find that the auto-compensation model can provide an explanation for the high-temperature kink in the conductivity of doped a-Si:H films but that it fails to account for the experimentally observed universality of the “Meyer-Neldel-rule” behaviour of the conductivity prefactor in differently prepared and doped a-Si:H films.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00616046
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  • 4
    Digitale Medien
    Digitale Medien
    On the generation and annealing of dangling bond defects in hydrogenated amorphous silicon (1988)
    Springer
    Applied physics 45 (1988), S. 41-51 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 66.3L ; 68.60 ; 72.80N
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract We show that, through the diffusive re-arrangement of Si-H bonds, the a-Si∶H lattice is able to establish thermal equilibrium between the densities of band tail trapped charge carriers and dangling bond defects. When this equilibrium is disturbed by changes in temperature, carrier injection or illumination, dangling bond defects have to be generated or annealed out via H-diffusion processes. Based on the concept of charge-induced bond breaking, we develop a mathematical formalism for the diffusive re-arrangement of Si-H bonds and show that our formalism can account for a variety of observations that have been made in the context of defect-generation and annealing experiments.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00618762
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  • 5
    Digitale Medien
    Digitale Medien
    Photoluminescence and efficiency of Ce3+ in SrS powders (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Advanced Materials for Optics and Electronics 3 (1994), S. 131-136 
    Details
    ISSN: 1057-9257
    Schlagwort(e): II-VI compound ; SrS : Ce ; Photoluminescence ; Concentration quenching ; Phosphorescence ; Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: The luminescence efficiency of SrS: Ce powders in the doping range from 0.01 to 1.0 at.% was investigated by photoluminescence decay studies. The radiative decay time of Ce3+ in SrS was determined to be 27 ns. The onset of concentration quenching at concentrations higher than about 0.7 at.% has been obtained. The photoluminescence spectrum of Ce3+ exhibits two emission bands as a consequence of the ground state splitting. The Huang-Rhys factor of the 5d-4f transition was estimated to be about 6. The inhomogeneous broadening of the emission band of samples with higher doping level has been investigated by site-selective and time-resolved spectroscopy.
    Zusätzliches Material: 9 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/amo.860030119
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  • 6
    Digitale Medien
    Digitale Medien
    Bekturov, E. A.; Bakauova, Z. Kh.: Synthetic Water-Soluble Polymers in Solution 241 S., 87 Abb., 30. Tab., Format 15 × 23 cm. Basel/Heidelberg/New York: Huethig & Wepf 1986 (1987)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 329 (1987), S. 1038-1038 
    Details
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/prac.19873290613
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    Artikel (Nationallizenzen)
    Volltext
  • 7
    Digitale Medien
    Digitale Medien
    Zur Kinetik der photoinduziertenRadikalpolymerisation mit Elektronendonator/Elektronenakzeptor-InitiatorsystemenLichtinitiierte Polymer- und Polymerisationsreaktionen 33. Mitt.; 32. Mitt.: Kronfeld, K. P.; Timpe, H.-J.: J. Photochem.; zur Publikation eingereicht.Herrn Prof. Dr. W. Pritzkow zum 60. Geburtstag gewidmet (1988)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 330 (1988), S. 704-716 
    Details
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Kinetics of Photoinduced Radical Polymerization with Electron Donor/Electron Acceptor Initiator SystemsBy means of benzyltriphenylphosphonium tetrafluoroborate (P⊕) and anthracene (An) as photoinitiator system and methylmethacrylate (MMA) as monomer the influences of several reaction parameters on the polymerization quantum yield Φp, were studied. The following principal reactions proceed: electron transfer between excited An (1An) and P⊕ salt (kq = 2,5 · 109 M-1 s-1), quenching of 1An by MMA (kqMMA = 1,3 · 107 M-1 s-1), reaction between a 1An…P⊕ salt complex and MMA. The last reaction is assumed, since from the disappearance of An and the formation of An cation radical, respectively, rate constants kqMMA 〉 108 M-1 s-1 have been calculated. Furthermore, it is assumed, that only the quenching of 1An by MMA (Φp = 3,8) and the addition of free radicals, produced by the photoinduced electron transfer, lead to polymer formation. Kinetic equations were developed, which can explain the effect of P⊕-salt concentration, light intensity and MMA concentration on Φp data. The quotient obtained for kp/kt0,5 is in the range of 0,053 to 0,087 M-0,5 s-0,5, depending on the used experimental parameters. Polymerization degrees Pn of 260-590 were found, which also depend on the experimental parameters.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/prac.19883300505
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  • 8
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: 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.
    Notizen: 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.
    Zusätzliches Material: 2 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/zaac.19683570403
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  • 9
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: 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).
    Notizen: 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).
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/zaac.19804620116
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  • 10
    Digitale Medien
    Digitale Medien
    Schwingungsspektren und Struktur von Dioxotrifluoromolybdaten und -wolframaten (1972)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 389 (1972), S. 177-187 
    Details
    ISSN: 0044-2313
    Schlagwort(e): Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: The infrared and Raman spectra of AIMeO2F3 (Me = Mo; AI = K, NH4, Rb, Cs, Tl; Me = W, AI = Rb, Cs) have been recorded and assigned. The postulated structure model of MeO2F3- has been confirmed by a single crystal X-ray study of CsMoO2F3. Octahedrally coordinated metal atoms are linked by cis-bridging fluorine atoms into infinite chains. The cis oxygen atoms are coplanar with the bridging fluorine atoms.
    Notizen: Die Infrarot- und RAMAN-Spektren der Salze AIMoO2F3 (AI = K, NH4, Rb, Cs, Tl) und der erstmalig dargestellten AIWO2F3 (AI = Rb, Cs) wurden registriert und zugeordnet. Das daraus abgeleitete Strukturmodell für das Ion MeO2F3- wurde durch eine röntgenographische Strukturuntersuchung an CsMoO2F3 bestätigt. In MeO2F3- ist das Me-Atom verzerrt oktaedrisch koordiniert (MeO2F2F2/2). Die Oktaeder sind durch cis-stehende Fluoratome zu unendlichen Ketten verknüpft, die cis-dioxo-Gruppe steht koplanar zu den Brückenatomen.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/zaac.19723890209
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