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  • Space Radiation  (2)
  • CHEMISTRY AND MATERIALS (GENERAL)  (1)
  • Electronic structure and strongly correlated systems  (1)
  • Plasma Physics  (1)
  • 1
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    Transverse and longitudinal magnetic-field responses in the Ising ferromagnets URhGe, UCoGe, and UGe_{2} (2011)
    American Physical Society (APS)
    Details
    Publication Date: 2011-05-06
    Description: Author(s): F. Hardy, D. Aoki, C. Meingast, P. Schweiss, P. Burger, H. v. Löhneysen, and J. Flouquet The field dependence of the electronic specific heat γ(H) of URhGe is determined using temperature-dependent magnetization measurements and Maxwell’s relation for all three orthorhombic directions. A large (≈40%) enhancement of γ(H) is found at the reorientational transition H_{R} for fields a... [Phys. Rev. B 83, 195107] Published Thu May 05, 2011
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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    PAPER CURRENT
  • 2
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    Working group written presentation: Trapped radiation effects (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The results of the Trapped Radiation Effects Panel for the Space Environmental Effects on Materials Workshop are presented. The needs of the space community for new data regarding effects of the space environment on materials, including electronics are listed. A series of questions asked of each of the panels at the workshop are addressed. Areas of research which should be pursued to satisfy the requirements for better knowledge of the environment and better understanding of the effects of the energetic charged particle environment on new materials and advanced electronics technology are suggested.
    Keywords: CHEMISTRY AND MATERIALS (GENERAL)
    Type: NASA(SDIO Space Environmental Effects on Materials Workshop, Part 2; p 597-605
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Historical Study of Radiation Exposures and the Incidence of Cataracts in Astronauts (2004)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: For over 35 years, astronauts in low Earth orbit or on missions to the moon have been exposed to space radiation comprised of high-energy protons, heavy ions, and secondary neutrons. We reviewed the radiation exposures received by astronauts in space and on Earth, and presented results from the first epidemiological study of cataract incidence in the astronauts. Our data suggested an increased risk for cataracts from space radiation exposures*. Using parametric survival analysis and the maximum likelihood method, we estimated the dose-response and age distribution for cataract incidence in astronauts by space radiation. Considering the high-LET dose contributions on specific space missions as well as data from animal studies with neutrons and heavy ions, suggested a linear response with no dose-threshold for cataracts. However, there are unanswered questions related to the importance and the definition of "clinically significant" cataracts commonly used in radiation protection, especially in light of epidemiological data suggesting that the probability that "sub-clinical" cataracts will progress is highly dependent on the age at which cataracts appear. We briefly describe a new study that will address the measurement of cataract progression-rates in astronauts and a ground-based comparison group.
    Keywords: Space Radiation
    Type: ISOT; Oct 19, 2004 - Oct 20, 2004; Fort Worth, TX; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Satellite Particle Collection During Active States of the Tethered Satellite System (TSS) (1996)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: The reflight of the Tethered Satellite System (TSS-1R) was carried aboard the Space Shuttle Columbia on February 22, 1996. After deploying a day later than planned, the satellite almost reached its full deployed distance before the tether broke. Data was collected for over 5 hours during deployment out to a distance of 19.7 km. Maximum emf attained during deployment was 3700 V while the maximum current achieved was just under 0.5 A. The current collected was factors of 2 to 4 greater than the predictions of the conventional Parker-Murphy theory. The microscopic view of the collection process at the satellite showed exotic behavior with the existence of 100 - 200 eV suprathermal electrons and significant spin phase modulation of the electron fluxes. Although the data set acquired from TSS- 1R was considerably less than planned, the quality of the data allows one of the main goals of the mission to be met--characterizing the system I-V response. A "quick look" assessment of the data has already shown that an understanding of the TSS-1R electrodynamic behavior will require modification of the standard picture of current collection in space plasmas
    Keywords: Plasma Physics
    Type: AIAA Paper 96-2298 , Plasmadynamics and Lasers; Jun 17, 1996 - Jun 20, 1996; New Orleans, LA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Historical Study of Radiation Exposures and the Incidence of Cataracts in Astronauts (2004)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: For over 35 years, astronauts in low Earth orbit or on missions to the moon have been exposed to space radiation comprised of high-energy protons, heavy ions, and secondary neutrons. We reviewed the radiation exposures received by astronauts in space and on Earth, and presented results from the first epidemiological study of cataract incidence in the astronauts. Our data suggested an increased risk for cataracts from space radiation exposures. Using parametric survival analysis and the maximum likelihood method, we estimated the dose-response and age distribution for cataract incidence in astronauts by space radiation. Considering the high-LET dose contributions on specific space missions as well as data from animal studies with neutrons and heavy ions, suggested a linear response with no dose-threshold for cataracts. However, there are unanswered questions related to the importance and the definition of clinically significant cataracts commonly used in radiation protection, especially in light of epidemiological data suggesting that the probability that sub-clinical cataracts will progress is highly dependent on the age at which cataracts appear. We briefly describe a new study that will address the measurement of cataract progression-rates in astronauts and a ground-based comparison group.
    Keywords: Space Radiation
    Type: ISOT; Oct 19, 2004 - Oct 20, 2004; Fort Worth, TX; United States
    Format: text
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    NASA TECHNICAL REPORTS
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