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  • 12.20.Fv  (1)
  • 71.60  (1)
  • Rabbit  (1)
  • Springer  (3)
  • Elsevier
  • Springer Science + Business Media
  • 1985-1989  (3)
Collection
Keywords
Publisher
  • Springer  (3)
  • Elsevier
  • Springer Science + Business Media
Years
  • 1985-1989  (3)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Amorphous hydrogenated silicon studied by positron lifetime spectroscopy (1986)
    Springer
    Applied physics 40 (1986), S. 145-149 
    Details
    ISSN: 1432-0630
    Keywords: 71.60 ; 72.80 ; 78.70 Bj
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Hydrogenated amorphous silicon (a-Si:H) prepared by dc glow discharge in silane was investigated by positron lifetime measurements at room temperature. The lifetime spectrum shows considerably longer lifetimes than in simultaneously measured Si single crystals. The dominant component with the time constantτ 2=402 ps is discussed thoroughly in conjunction with positron trapping at microvoids containing more than 10 to 15 vacancies. Positron trapping at H-saturated dangling bonds cannot be ruled out. The long-lived component withτ 3=1800 ps (I 3=0.06) indicates positronium formation at larger voids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617395
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  • 2
    Electronic Resource
    Electronic Resource
    Ultrastructural localization of calcitonin and somatostatin in C cells of rabbit thyroid (1986)
    Springer
    Cell & tissue research 245 (1986), S. 667-672 
    Details
    ISSN: 1432-0878
    Keywords: C cells ; Electron microscopical immunocytochemistry ; Calcitonin ; Somatostatin ; Rabbit
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary C cells of rabbit thyroid exhibit significant differences in morphology, namely a variable nuclear structure and differences in size and osmophility of secretory granules. An examination of serial sections of these cells was made, using the immunocytochemical PAP or protein A gold procedures. All C cells, irrespective of their morphology, were found to store both calcitonin and somatostatin in all secretory granules. The physiological role of somatostatin in calcitonin secretion by C cells is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00218570
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  • 3
    Electronic Resource
    Electronic Resource
    Evidence for a resonance in positron-electron scattering at 810 keV centre-of-mass Energy (1988)
    Springer
    The European physical journal 330 (1988), S. 173-181 
    Details
    ISSN: 1434-601X
    Keywords: 13.10.+q ; 12.20.Fv ; 14.80.Pb
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A monoenergetic positron (e +) beam (ΔT/T〈5·10−4) from the Stuttgart pelletron accelerator and a 4.6 mg/cm2 Be target has been employed to investigatee + e −scattering in the MeV region in a large solid angle with high statistics by means of a novel positionsensitive detector system. Superimposed on the Bhabha scattering, a structure has been found at ane + kinetic energy of 2263 keV (810 keV excitation energy in thee + e −rest frame). From the energy-integrated resonance cross-section of $$\sigma _{res} \cdot \Gamma _{res}^{e^ + e^ - } $$ ≅30 b·eV (c.m.) and the standard resonance cross-section we estimate partial resonance widths $$\Gamma _{res}^{e^ + e^ - } $$ ≅72 meV or 24 meV for total angular momenta J=0 or J=1, respectively. The structure, which has not been predicted within the framework of quantum electrodynamics, coincides with one of the sum energies of the correlatede + e −lines observed in heavy-ion collisions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01293393
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