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  • 2010-2014  (3)
  • 2014  (3)
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  • 2010-2014  (3)
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  • 1
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    Effect of rotational disruption on the size-frequency distribution of the Main Belt asteroid population (2014)
    Oxford University Press
    Details
    Publication Date: 2014-03-02
    Description: The size distribution of small asteroids in the Main Belt is assumed to be determined by an equilibrium between the creation of new bodies out of the impact debris of larger asteroids and the destruction of small asteroids by collisions with smaller projectiles. However, for a diameter less than 6 km, we find that YORP-induced rotational disruption significantly contributes to the erosion even exceeding the effects of collisional fragmentation. Including this additional grinding mechanism in a collision evolution model for the asteroid belt, we generate size–frequency distributions from either an accretional or an ‘Asteroids were born big’ initial size–frequency distribution that are consistent with observations reported in Gladman et al. Rotational disruption is a new mechanism that must be included in all future collisional evolution models of asteroids.
    Print ISSN: 1745-3925
    Electronic ISSN: 1745-3933
    Topics: Physics
    Published by Oxford University Press
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    PAPER CURRENT
  • 2
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    Mass-ablation-rate measurements in direct-drive cryogenic implosions using x-ray self-emission imagesa) (2014)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2014-08-06
    Description: A technique to measure the mass ablation rate in direct-drive inertial confinement fusion implosions using a pinhole x-ray framing camera is presented. In target designs consisting of two layers of different materials, two x-ray self-emission peaks from the coronal plasma were measured once the laser burned through the higher- Z outer layer. The location of the inner peak is related to the position of the ablation front and the location of the outer peak corresponds to the position of the interface of the two layers in the plasma. The emergence of the second peak was used to measure the burnthrough time of the outer layer, giving the average mass ablation rate of the material and instantaneous mass remaining. By varying the thickness of the outer layer, the mass ablation rate can be obtained as a function of time. Simulations were used to validate the methods and verify that the measurement techniques are not sensitive to perturbation growth at the ablation surface.
    Print ISSN: 0034-6748
    Electronic ISSN: 1089-7623
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Published by American Institute of Physics (AIP)
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  • 3
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    RoboGlove - A Robonaut Derived Multipurpose Assistive Device (2014)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The RoboGlove is an assistive device that can augment human strength, endurance or provide directed motion for use in rehabilitation. RoboGlove is a spinoff of the highly successful Robonaut 2 (R2) system developed as part of a partnership between General Motors and NASA. This extremely lightweight device employs an actuator system based on the R2 finger drive system to transfer part or the entire grasp load from human tendons to artificial ones contained in the glove. Steady state loads ranging from 15 to 20 lbs. and peaks approaching 50 lbs. are achievable. The technology holds great promise for use with space suit gloves to reduce fatigue during space walks. Tactile sensing, miniaturized electronics, and on-board processing provide sufficient flexibility for applications in many industries. The following describes the design, mechanical/electrical integration, and control features of the glove.
    Keywords: Cybernetics, Artificial Intelligence and Robotics
    Type: JSC-CN-30211 , International Conference on Robotics and Automation; May 31, 2014 - Jun 07, 2014; Hong Kong, China; China
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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