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  • Other Sources  (4)
  • SPACE RADIATION  (2)
  • ELECTRONICS AND ELECTRICAL ENGINEERING  (1)
  • FABRICATION TECHNOLOGY  (1)
  • Cell & Developmental Biology
  • Supercritical fluid chromatography
  • 1985-1989  (4)
  • 1986  (4)
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  • 1985-1989  (4)
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  • 1
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    Diffusive electron acceleration at SNR shock fronts and the observed SNR radio spectral indices (1986)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The radio synchrotron emission from relativistic electrons in shell supernova remnants (SNRs) provides a unique opportunity to probe the energy distribution of energetic electrons at their acceleration site (SNR shock fronts). This information provides insight into the acceleration mechanism(s). The implications of these observations for the diffusive (first-order Fermi) acceleration of electrons at the SNR shock fronts are discussed.
    Keywords: SPACE RADIATION
    Type: NASA. Goddard Space Flight Center Nineteenth International Cosmic Ray Conference. Conference Papers: Invited Rapporteur, Highlight, Miscellaneous, Volume 9; 4 p
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Analysis of the harmonic gyrotron traveling wave amplifier (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A single nonlinear differential equation is derived for describing the spatial evolution of the wave field in a gyrotron amplifier on the cylindrical guide geometry. The equation is then used to determine the efficiencies and the optimized interaction lengths for gyrotron operated with TE sub N1 modes at the N-th cyclotron harmonic. The equation offers a significant advantage in simplifying numerical work in comparison with the brute force particle simulation approach. The efficiencies of the harmonic operations by using a hollow beam decrease quickly with increasing harmonic number, but are enhanced by using an axis-encircling beam instead.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: International Journal of Infrared and Millimeter Waves (ISSN 0195-9271); 7; 635-651
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Producing Refractory Microballoons (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Metals, ceramics, and glasses just some of possible raw materials. Key components of equipment for new microballoon fabrication process nozzle, crucible assembly, and drop tube. Recessed, conical inner orifice aids in producing uniform, symmetrical microballoons. All-graphite crucible assembly resistant to misalinement and cracks. Drop tube ensures timely solidification of microballoons used in fluidized-bed heat exchangers; as containers for hazardous materials; catalysts in chemical and pharmaceutical processes; solid fuel for rockets; fuel containers for fusion power experiments; shock-wave dampers; and starting materials for high-strength, low-density sintered alloys and ceramics.
    Keywords: FABRICATION TECHNOLOGY
    Type: NPO-16489 , NASA Tech Briefs (ISSN 0145-319X); 10; 6; P. 83
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    A perturbation approach to cosmic ray transients in interplanetary space (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A perturbation approach is used to model the linear response of the cosmic ray distribution as a function of perturbations in the solar wind transport parameters. The analytical technique permits examination of the effects of the different solar wind parameters, i.e., velocity, drift velocity and the diffusion tensor, which are additive. Cosmic ray changes in the solar wind are neglected. Variations in the diffusion coefficient and the convection-diffusion equation are applied to describing Forbush decreases and the 11-yr solar cycle variations. The treatment is limited to energies above 100 MeV, yet is considered valid enough to have identified a hysteresis effect in the 11-yr variation, wherein high-energy particles lead low-energy particles to a magnitude that increases with increasing heliocentric distance within the inner heliosphere. The calculations also indicate that the Forbush decreases are a cumulative effect of precipitous precursors accompanied by slow recoveries from travelling solar wind perturbations.
    Keywords: SPACE RADIATION
    Type: Journal of Geophysical Research (ISSN 0148-0227); 91; 2903-291
    Format: text
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    NASA TECHNICAL REPORTS
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