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  • *Arabidopsis Proteins  (1)
  • Astronomy  (1)
  • 1995-1999  (2)
  • 1950-1954
  • 1
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    The root of angiosperm phylogeny inferred from duplicate phytochrome genes (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-11-05
    Description: An analysis of duplicate phytochrome genes (PHYA and PHYC) is used to root the angiosperms, thereby avoiding the inclusion of highly diverged outgroup sequences. The results unambiguously place the root near Amborella (one species, New Caledonia) and resolve water lilies (Nymphaeales, approximately 70 species, cosmopolitan), followed by Austrobaileya (one species, Australia), as early branches. These findings bear directly on the interpretation of morphological evolution and diversification within angiosperms.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mathews, S -- Donoghue, M J -- New York, N.Y. -- Science. 1999 Oct 29;286(5441):947-50.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Organismic and Evolutionary Biology, Harvard University Herbaria, 22 Divinity Avenue, Cambridge, MA 02138, USA. smathews@oeb.harvard.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10542147" target="_blank"〉PubMed〈/a〉
    Keywords: Angiosperms/*classification ; Apoproteins/*genetics ; *Arabidopsis Proteins ; *Gene Duplication ; Genes, Plant ; Phylogeny ; Phytochrome/*genetics ; Phytochrome A ; Plant Proteins/*genetics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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    PAPER CURRENT
  • 2
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    Hubble Space Telescope (HST) Solar Array Damper (1999)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: This paper describes the design of a solar array damper that will be built into each of two new solar arrays to be installed on the Hubble Space Telescope (HST) during Servicing Mission 3. On this mission, currently scheduled for August, 2000, two "rigid" solar array wings will replace the "flexible" wings currently providing power for HST. Dynamic interaction of these wings with the telescope spacecraft can affect the Pointing Control System. The damper, which is integral to the mast of the solar array, suppresses the fundamental bending modes of the deployed wings at 1.2 Hz (in-plane) and 1.6 Hz (out-of-plane). With the flight version of the damper, modal damping of 2.3% of critical is expected over the temperature range of -4 C to 23 C with a peak damping level of 3.9%. The unique damper design is a combination of a titanium spring and viscoelastic-shear-lap dashpot. The damper was designed using a system finite element model of the solar array wing and measured viscoelastic material properties. Direct complex stiffness (DCS) testing was performed to characterize the frequency- and temperature-dependent behavior of the damping prior to fixed-base modal testing of the wing at NASA/Goddard Space Flight Center (NASA/GSFC).
    Keywords: Astronomy
    Type: Smart Structures; Mar 01, 1999; United States
    Format: text
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    NASA TECHNICAL REPORTS
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