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  • Other Sources  (4)
  • 2015-2019  (1)
  • 1990-1994  (3)
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  • 1
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    A detailed study of the photo-injection annealing of thermally diffused InP solar cells (1993)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: A detailed analysis of the annealing of thermally diffused InP solar cells fabricated by the Nippon Mining Co. is presented. The cells were irradiated with 1 MeV electrons, and the induced degradation is measured using deep level transient spectroscopy and low temperature (86 K) IV measurements. Clear recovery of the photovoltaic parameters is observed during low temperature (T is less than 300 K) solar illuminations (1 sun, AMO) with further recovery at higher temperatures (300 less than T less than 500 K). For example, the output of a cell which was irradiated up to a fluence of 1 x 10(exp 16) cm(sup -2) was observed to recover to within 5 percent of the pre-irradiation output. An apparent correlation between the recovery of I(sub sc) and the annealing of the H4 defect and of the minority carrier trapping centers is observed. An apparent correlation between the recovery of VO, and the annealing of the H5 defect is also observed. These apparent correlations are used to develop a possible model for the mechanism of the recovery of the solar cells.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: NASA. Lewis Research Center, Proceedings of the 12th Space Photovoltaic Research and Technology Conference (SPRAT 12); p 1-7
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Low Earth orbit communications satellite (1992)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: A current thrust in satellite communication systems considers a low-Earth orbiting constellations of satellites for continuous global coverage. Conceptual design studies have been done at the time of this design project by LORAL Aerospace Corporation under the program name GLOBALSTAR and by Motorola under their IRIDIUM program. This design project concentrates on the spacecraft design of the GLOBALSTAR low-Earth orbiting communication system. Overview information on the program was gained through the Federal Communications Commission licensing request. The GLOBALSTAR system consists of 48 operational satellites positioned in a Walker Delta pattern providing global coverage and redundancy. The operational orbit is 1389 km (750 nmi) altitude with eight planes of six satellites each. The orbital planes are spaced 45 deg., and the spacecraft are separated by 60 deg. within the plane. A Delta 2 launch vehicle is used to carry six spacecraft for orbit establishment. Once in orbit, the spacecraft will utilize code-division multiple access (spread spectrum modulation) for digital relay, voice, and radio determination satellite services (RDSS) yielding position determination with accuracy up to 200 meters.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: USRA, Proceedings of the 8th Annual Summer Conference: NASA(USRA Advanced Design Program; p 287-297
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    NASA TECHNICAL REPORTS
  • 3
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    Spacecraft design project: Low Earth orbit communications satellite (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This is the final product of the spacecraft design project completed to fulfill the academic requirements of the Spacecraft Design and Integration 2 course (AE-4871) taught at the U.S. Naval Postgraduate School. The Spacecraft Design and Integration 2 course is intended to provide students detailed design experience in selection and design of both satellite system and subsystem components, and their location and integration into a final spacecraft configuration. The design team pursued a design to support a Low Earth Orbiting (LEO) communications system (GLOBALSTAR) currently under development by the Loral Cellular Systems Corporation. Each of the 14 team members was assigned both primary and secondary duties in program management or system design. Hardware selection, spacecraft component design, analysis, and integration were accomplished within the constraints imposed by the 11 week academic schedule and the available design facilities.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-CR-192038 , NAS 1.26:192038
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    NASA TECHNICAL REPORTS
  • 4
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    Mikrobialith-Porifera Fazies eines Exogyren/Korallen Patchreefs des Oberen Korallenooliths im Steinbruch Langenberg bei Oker (Niedersachsen) (2018)
    Details
    Publication Date: 2021-04-25
    Description: Im oberen Korallenoolith (Oxford-Kimmeridge) von Oker entwickelten sich kleine lagunäre Riffe, deren Gerüst aus Exogyren, Serpeln und großen einzelnen Korallenstöcken gebildet wurde. Die umgebende Fazies besteht aus stabilen Weichböden mit reicher Molluskenfauna (Nerineen, Lamellibranchiata). Gerüstbildende Algen werden nicht beobachtet. Dasycladaceen sind selten. In Zwickeln, Kleinhöhlen und leeren Exogyren-Schalen siedelte sich eine diverse Poriferen-Fauna an, die von tetractinelliden Demospongiae dominiert wird. Durch Umwandlung von Teilen des Schwammgewebes in Automikrit kam es zu einer in situ Erhaltung vieler Porifera-Skelette (bakterielle Ammonifikation). Neben diesen autigenen Mikritbildungen spielen weitere stromatolithische und thrombolithische Mikrobialithe bei der Stabilisierung der lagunären Patchreefs eine erhebliche Rolle.
    Description: In the uppermost facies of the OxfordianiKimmeridgian "Korallenoolith" of Oker small lagoonal patchreefs are present. They are constructed of exogyrid oysters, serpulids, and large single scleractinians. Framebuilding algae are absend. The surrounding sediments were stable soft bottoms with large numbers of nerineid gastropods and semi-infaunal bivales. Dasycladacean algae are rarely present. Within small caves, empty conches of exogyrids, and inter biogene spaces settled a large number of cryptic sponges (mainly tetractinellid demosponges). Caused by bacterial ammonification part of the sponge soft tissues were altered in automicrite. Therefore the sponge skeletons exhibit more or less their entire shapes. Beside this type of automicrite stromatolitic and and thrombolitic microbialites play an important role in stabilizing the patchreef frame.
    Keywords: Paläontologie: Allgemeines ; 551 ; VU 000 ; 38.20 ; 38.2
    Language: German
    Type: article , publishedVersion
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    CITATION GEO-LEO
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