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  • 1
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    Infrared observations of an outburst of small dust grains from the nucleus of Comet P/Halley 1986 III at perihelion (1995)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-24
    Beschreibung: A close examination of the 0.7- to 23-micron infrared data base acquired by Gehrz and Ney (1992), suggests that the nucleus of Comet P/Halley 1986 III emitted a burst of small dust grains during a 3-day period commencing within hours of perihelion passage on 1986 February 9.46 UT. The outburst was characterized by significant increases in the coma's grain color temperature T(sub obs), temperature excess (superheat: S = T(sub obs)/T(sub BB)), infrared luminosity, albedo, and 10-micron silicate emission feature strength. These changes are all consistent with the sudden ejection from the nucleus of a cloud of grains with radii of approximately 0.5 micron. This outburst may have produced the dust that was responsible for some of the tail streamers photographed on 1986 February 22 UT. The peak of the dust outburst occurred about 3 days before a pronounced increase in the water production rate measured by the Pioneer Venus Orbiter Ultraviolet Spectrometer. We suggest that jets that release large quantities of small particles may be largely responsible for some of the variable infrared behavior that has been reported for P/Halley and other comets during the past two decades. Such jets may also account for some of the differences IR Type I and IR Type II comets.
    Schlagwort(e): ASTRONOMY
    Materialart: Icarus (ISSN 0019-1035); 113; 1; p. 129-133
    Format: text
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  • 2
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    New Young Star Candidates in BRC 27 and BRC 34 (2012)
    In:  CASI
    Details
    Publikationsdatum: 2019-05-29
    Beschreibung: We used archival Spitzer Space Telescope mid-infrared data to search for young stellar objects (YSOs) in the immediate vicinity of two bright-rimmed clouds, BRC 27 (part of CMa R1) and BRC 34 (part of the IC 1396 complex). These regions both appear to be actively forming young stars, perhaps triggered by the proximate OB stars. In BRC 27, we find clear infrared excesses around 22 of the 26 YSOs or YSO candidates identified in the literature, and identify 16 new YSO candidates that appear to have IR excesses. In BRC 34, the one literature-identified YSO has an IR excess, and we suggest 13 new YSO candidates in this region, including a new Class I object. Considering the entire ensemble, both BRCs are likely of comparable ages, within the uncertainties of small number statistics and without spectroscopy to confirm or refute the YSO candidates. Similarly, no clear conclusions can yet be drawn about any possible age gradients that may be present across the BRCs.
    Schlagwort(e): Astrophysics
    Materialart: GSFC-E-DAA-TN8390 , Astronomical Journal (ISSN 0004-6256) (e-ISSN 1538-3881); 145; 1; 15
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Preliminary design and simulations of a Shuttle-Attached Manipulator System. (1973)
    In:  Other Sources
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    Publikationsdatum: 2019-07-13
    Beschreibung: The preliminary design of a Shuttle-Attached Manipulator System is based on two arms that are articulated at shoulder, elbow, and wrist. Details of manipulator design are considered, giving attention to arm reach, velocity, acceleration, torque, joint angular travel limits, control, crew systems and man-machine interface, and telecommunications. The results of man-in-the-loop simulations show the feasibility of grappling a representative space payload from the Shuttle using a long boom manipulator system. The task, however, is sufficiently difficult to require the full concentration of one operator who should be relieved of any other tasks while performing operations with the manipulator system.
    Schlagwort(e): SPACE VEHICLES
    Materialart: National Conference on Remotely manned systems: Exploration and operation in space; Sep 13, 1972 - Sep 15, 1972; Pasadena, CA
    Format: text
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  • 4
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    Configuration and design study of manipulator systems applicable to the freeflying teleoperator. Volume 2: Preliminary design (1974)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: The preliminary design of a remotely controlled teleoperator for space application is reported that depends on man for control inputs and extends operation of the space shuttle.
    Schlagwort(e): BIOTECHNOLOGY
    Materialart: NASA-CR-120403 , MCR-74-290-VOL-2
    Format: application/pdf
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  • 5
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    Circadian oscillations of cytosolic and chloroplastic free calcium in plants (1995)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: Tobacco and Arabidopsis plants, expressing a transgene for the calcium-sensitive luminescent protein apoaequorin, revealed circadian oscillations in free cytosolic calcium that can be phase-shifted by light-dark signals. When apoaequorin was targeted to the chloroplast, circadian chloroplast calcium rhythms were likewise observed after transfer of the seedlings to constant darkness. Circadian oscillations in free calcium concentrations can be expected to control many calcium-dependent enzymes and processes accounting for circadian outputs. Regulation of calcium flux is therefore fundamental to the organization of circadian systems.
    Schlagwort(e): Life Sciences (General)
    Materialart: Science (ISSN 0036-8075); 269; 5232; 1863-5
    Format: text
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  • 6
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    Stochastic crew motion modeling. (1969)
    In:  Other Sources
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    Publikationsdatum: 2019-07-13
    Beschreibung: Representative data of actual forces and moments applicable to large spacecraft attitude control system for typical crew activities obtained through simulation programs
    Schlagwort(e): FACILITIES, RESEARCH, AND SUPPORT
    Materialart: AIAA PAPER 69-1006 , AMERICAN INST. OF AERONAUTICS AND ASTRONAUTICS, AEROSPACE COMPUTER SYSTEMS CONFERENCE; Sep 08, 1969 - Sep 10, 1969; LOS ANGELES, CALIF.
    Format: text
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  • 7
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    The effects of astronaut motion on precise control of spacecraft attitude. (1968)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: Astronaut motion effect on precise control of spacecraft attitude
    Schlagwort(e): BIOTECHNOLOGY
    Materialart: SPACE CONGRESS; Mar 11, 1968 - Mar 14, 1968; COCOA BEACH, FL
    Format: text
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