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  • Weitere Quellen  (32)
  • Aircraft Design, Testing and Performance  (11)
  • Astronomy  (8)
  • Space Sciences (General)  (7)
  • Space Radiation  (6)
  • 1
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    Effect of Thermospheric Neutral Density upon Inner Trapped-belt Proton Flux (2007)
    In:  CASI
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    Publikationsdatum: 2018-06-11
    Beschreibung: We wish to point out that a secular change in the Earth's atmospheric neutral density alters charged-particle lifetime in the inner trapped radiation belts, in addition to the changes recently reported as produced by greenhouse gases. Heretofore, changes in neutral density have been of interest primarily because of their effect on the orbital drag of satellites. We extend this to include the orbital lifetime of charged particles in the lower radiation belts. It is known that the charged-belt population is coupled to the neutral density of the atmosphere through changes induced by solar activity, an effect produced by multiple scattering off neutral and ionized atoms along with ionization loss in the thermosphere where charged and neutral populations interact. It will be shown here that trapped-belt flux J is bivariant in energy E and thermospheric neutral density , as J(E,rho). One can conclude that proton lifetimes in these belts are also directly affected by secular changes in the neutral species populating the Earth s thermosphere. This result is a consequence of an intrinsic property of charged-particle flux, that flux is not merely a function of E but is dependent upon density rho when a background of neutrals is present.
    Schlagwort(e): Space Sciences (General)
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  • 2
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    Quantifying Low Energy Proton Damage in Multijunction Solar Cells (2007)
    In:  CASI
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    Publikationsdatum: 2018-06-06
    Beschreibung: An analysis of the effects of low energy proton irradiation on the electrical performance of triple junction (3J) InGaP2/GaAs/Ge solar cells is presented. The Monte Carlo ion transport code (SRIM) is used to simulate the damage profile induced in a 3J solar cell under the conditions of typical ground testing and that of the space environment. The results are used to present a quantitative analysis of the defect, and hence damage, distribution induced in the cell active region by the different radiation conditions. The modelling results show that, in the space environment, the solar cell will experience a uniform damage distribution through the active region of the cell. Through an application of the displacement damage dose analysis methodology, the implications of this result on mission performance predictions are investigated.
    Schlagwort(e): Space Sciences (General)
    Materialart: Proceedings of the 19th Space Photovoltaic Research and Technology Conference; 8-17; NASA/CP-2007-214494
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  • 3
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    Change Detection Experiments Using Low Cost UAVs (2005)
    In:  CASI
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    Publikationsdatum: 2019-07-27
    Beschreibung: This paper presents the progress in the development of a low-cost change-detection system. This system is being developed to provide users with the ability to use a low-cost unmanned aerial vehicle (UAV) and image processing system that can detect changes in specific fixed ground locations using video provided by an autonomous UAV. The results of field experiments conducted with the US Army at Ft. A.P.Hill are presented.
    Schlagwort(e): Aircraft Design, Testing and Performance
    Materialart: Infotech@Aerospace; 26-29 Sept. 2005; Arlington, VA; United States
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  • 4
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    Design, Development, and Testing of a Compound Wing V/TOL small UAS (2015)
    In:  CASI
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    Publikationsdatum: 2019-07-19
    Beschreibung: This paper discusses the development and testing of an innovative small UAS (Unmanned Aircraft System). The design of the vehicle was driven by the need to both have long endurance yet still have the convenience of V/TOL (Vertical Take-Off and Landing) operation. The paper discusses some of the design considerations and configurations evaluated in searching for a configuration that met the demanding mission requirements. The paper also discusses some aspects of the compound wing and experimental testing conducted to discern the optimum parameters for the wing's design. The paper discusses the results of the preliminary flight testing and outlines further research to be conducted.
    Schlagwort(e): Aircraft Design, Testing and Performance
    Materialart: NF1676L-19089 , SciTech 2015; Jan 05, 2015 - Jan 09, 2015; Kissimmee, FL; United States
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  • 5
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    Status of the SOFIA Observatory (2015)
    In:  CASI
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    Publikationsdatum: 2019-07-19
    Beschreibung: The SOFIA observatory has been in routine science operations since returning in January from a 6 month-long heavy maintenance period for the aircraft and the telescope assembly. These operations include a successful 6 week deployment to the Southern hemisphere. This presentation will provide an update to the current operational status of the SOFIA observatory, concentrating on the improvements and upgrades that have been implemented since the heavy maintenance period.
    Schlagwort(e): Astronomy
    Materialart: ARC-E-DAA-TN23899 , International Astronomical Union General Assembly; Aug 03, 2015 - Aug 14, 2015; Honolulu, HI; United States
    Format: application/pdf
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  • 6
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    Spitzer Spectroscopy of Low-Mass Dwarfs - Clouds and Chemistry at the Bottom of the IMF (2006)
    In:  Other Sources
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    Publikationsdatum: 2019-07-18
    Beschreibung: Brown dwarfs and low-mass stars show evidence of complicated atmospheres, including a variety of molecular species and clouds. Infrared observations are one of the best probes of the physics of these objects, but up until recently these observations have been limited in studies from ground-based telescopes by atmospheric absorption and insufficient sensitivity. With the launch of the Spitzer Space Telescope with its Infrared Spectrograph (IRS) instrument we now have the capability to undertake a systematic study of the atmospheric structure and chemistry in these cool objects. The IRS Dim Suns team has compiled spectra from objects ranging from M1 dwarfs with effective temperatures 3,800K of down to T8 dwarfs with effective temperatures of 700. This talk will present these results and discuss their implications for our understanding of cool dwarf atmospheric physics and structure.
    Schlagwort(e): Space Sciences (General)
    Format: text
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  • 7
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    Spitzer Infrared Spectrograph Observations of L, M, and T Dwarfs (2004)
    In:  Other Sources
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    Publikationsdatum: 2019-07-18
    Beschreibung: We present here the first mid-infriared spectra of brown dwarfs, together with observations of a low-mass star. Our targets are the M3.5 dwarf GJ 1001 A, the L8 dwarf DENIS-P JO255-4700, and the T1/T6 binary system epsilon Indi Ba/Bb. As expected, the mid- infrared spectral morphology of these objects changes rapidly with spectral class due to the changes in atmospheric chemistry resulting from their differing effective temperatures and atmospheric structures. By taking advantage of the unprecedented sensitivity of the Infrared Spectrograph instrument of the Spitzer Space Telescope we have detected for the first time the 7.6 micron methane band and confirmed the presence of ammonia in a T dwarf atmosphere.
    Schlagwort(e): Astronomy
    Materialart: SSA-137
    Format: text
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  • 8
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    Toward Large-Area Sub-Arcsecond X-Ray Telescopes (2014)
    In:  CASI
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    Publikationsdatum: 2019-07-13
    Beschreibung: The future of x-ray astronomy depends upon development of x-ray telescopes with larger aperture areas (approx. = 3 square meters) and fine angular resolution (approx. = 1 inch). Combined with the special requirements of nested grazing-incidence optics, the mass and envelope constraints of space-borne telescopes render such advances technologically and programmatically challenging. Achieving this goal will require precision fabrication, alignment, mounting, and assembly of large areas (approx. = 600 square meters) of lightweight (approx. = 1 kilogram/square meter areal density) high-quality mirrors at an acceptable cost (approx. = 1 million dollars/square meter of mirror surface area). This paper reviews relevant technological and programmatic issues, as well as possible approaches for addressing these issues-including active (in-space adjustable) alignment and figure correction.
    Schlagwort(e): Astronomy
    Materialart: M14-4110 , SPIE Optics + Photonics; Aug 17, 2014 - Aug 21, 2014; San Diego, CA; United States
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  • 9
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    Status of the Space Radiation Monte Carlos Simulation Based on FLUKA and ROOT (2002)
    In:  CASI
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: The NASA-funded project reported on at the first IWSSRR in Arona to develop a Monte-Carlo simulation program for use in simulating the space radiation environment based on the FLUKA and ROOT codes is well into its second year of development, and considerable progress has been made. The general tasks required to achieve the final goals include the addition of heavy-ion interactions into the FLUKA code and the provision of a ROOT-based interface to FLUKA. The most significant progress to date includes the incorporation of the DPMJET event generator code within FLUKA to handle heavy-ion interactions for incident projectile energies greater than 3GeV/A. The ongoing effort intends to extend the treatment of these interactions down to 10 MeV, and at present two alternative approaches are being explored. The ROOT interface is being pursued in conjunction with the CERN LHC ALICE software team through an adaptation of their existing AliROOT software. As a check on the validity of the code, a simulation of the recent data taken by the ATIC experiment is underway.
    Schlagwort(e): Space Radiation
    Materialart: JSC-CN-7682 , 2nd International Workshop on Space Radiation Research (IWSSR); Mar 11, 2001 - Mar 15, 2001; Nara; Japan
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  • 10
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    Toward Active X-ray Telescopes II (2012)
    In:  CASI
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    Publikationsdatum: 2019-07-13
    Beschreibung: In the half century since the initial discovery of an astronomical (non-solar) x-ray source, the sensitivity for detection of cosmic x-ray sources has improved by ten orders of magnitude. Largely responsible for this dramatic progress has been the refinement of the (grazing-incidence) focusing x-ray telescope. The future of x-ray astronomy relies upon the development of x-ray telescopes with larger aperture areas (greater than 1 m2) and finer angular resolution (less than 1.). Combined with the special requirements of grazing-incidence optics, the mass and envelope constraints of space-borne telescopes render such advances technologically challenging.requiring precision fabrication, alignment, and assembly of large areas (greater than 100 m2) of lightweight (approximately 1 kg m2 areal density) mirrors. Achieving precise and stable alignment and figure control may entail active (in-space adjustable) x-ray optics. This paper discusses relevant programmatic and technological issues and summarizes progress toward active x-ray telescopes.
    Schlagwort(e): Astronomy
    Materialart: M11-1524 , M12-2031 , M12-2148 , The International Society for Optics and Photonics (SPIE) 2012; Aug 12, 2012 - Aug 16, 2012; San Diego, CA; United States
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