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  • Articles: DFG German National Licenses  (4)
  • 1985-1989  (4)
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  • Articles: DFG German National Licenses  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    Characteristics of the Si-SiO2 interface states in thin (70–230 A(ring)) oxide structures (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 5353-5359 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Important characteristics of the Si-SiO2 interface states, such as the interface state density distributions and the electron and the hole capture cross section versus energy profiles, were investigated in unannealed metal/silicon dioxide/silicon (MOS) structures with the gate oxide thickness in the range of 70–230 A(ring), using the optical MOS admittance technique. The experimentally obtained interface state density distribution, in case of p-Si/SiO2/Al structures, exhibited two peaked profiles, one near the valence-band edge Ev and the other near the conduction-band edge Ec, overlying a concave background. The state density at the peak was observed to undergo a maximum, preceded by a minimum, as the gate oxide thickness tox was increased. The peak energy versus tox and the capture cross section versus tox profiles also indicated strong features.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338273
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Determination of silicon-silicon dioxide interface state properties from admittance measurements under illumination (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 58 (1985), S. 4256-4266 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: For the present investigation n-Si/SiO2/In2O3 transparent gate structures were fabricated by electron-beam evaporation of a tin-doped indium oxide layer on thermally oxidized silicon. Admittance measurements were carried out in dark and under three different levels of illumination. A comprehensive technique has been presented for obtaining interface state density distribution from illuminated capacitance data as well as from illuminated conductance data, and hole and electron capture cross sections from the latter. This technique includes a procedure for identification of the dominant quasi-Fermi level (imref) under illumination for determination of the state energy level, three independent methods for evaluating the imref separation from measured data, and a procedure for ascertaining whether electron or hole exchange is the source of a set of Gp/ω vs V or ω characteristics. The interface state density distribution of unannealed structures exhibited two peaked profiles. One peak was located about 0.36–0.41 eV above the valence-band edge, while the other was located about 0.30–0.17 eV below the conduction-band edge. The peak magnitude was found to increase with the illumination intensity and the peak position moved towards the respective band edge. Electron capture cross sections of states in the upper band gap half were found to be in the range of 10−18–10−20 cm2, and hole capture cross sections of states in the lower band gap half in the range of 10−15–10−16 cm2. Both σe and σh were found to vary with band-gap energy and illumination level.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335561
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Cytodifferentiation and immunocharacteristics of adenohypophysial cells in the toad, Bufo melanostictus (1986)
    Springer
    Anatomy and embryology 175 (1986), S. 137-146 
    Details
    ISSN: 1432-0568
    Keywords: Adenohypophysis ; Cytodifferentiation ; Immunohistochemistry ; Toad
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Employing the unlabelled antibody enzyme technique cytodifferentiation, immunocharacteristics and topographical distribution of melanotropic (MSH), adrenocorticotropic (ACTH), thyrotropic (TSH), prolactin (PRL), gonadotropic (GTH) and growth hormone (GH) secreting cells in the embryonic/larval as well as adult pituitary gland of the common Indian toad, Bufo melanostictus, have been studied by using antisera raised in rabbit against mammalian hypophysial hormones. Immunoreactive MSH and ACTH cells appear first in the dorsocaudal and rostral regions of the pituitary anlage (PA) at stage 21 (Gosner's classification) of the embryonic development. This is followed by the differentiation of TSH and PRL cells at stage 22 in the midventral and central regions of the PA respectively. Finally, at stage 23 the GTH cells appear in the fostral and the GH cells in the caudal regions of the PA. With the progress of the development, cells showing immunoreactivity to various antisera gradually increase in number, size, granular content and finally occupy the characteristic adult disposition. The MSH cells comprise the pars intermedia. In the pars distalis (PD) the ACTH cells are localized in the rostroventral region, TSH cells in the central region and the GH cells in the dorsocaudal region. However, GTH and PRL cells are distributed throughout the PD.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00315464
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The status of trace and minor elements in pulses: A PIXE measurement (1986)
    Springer
    Journal of radioanalytical and nuclear chemistry 97 (1986), S. 113-122 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The proton particle induced X-ray emission (proton PIXE) technique has been employed to study the heavy element status (essential and toxic) in five different varieties of pulses commonly cultivated and consumed in Bangladesh. In this analysis, the samples were irradiated in air with 2 MeV protons having 30 nA beam intensity for characteristic X-ray excitation. For 40 μC irradiations, the concentration of ten elements (K, Ca, Ti, Mn, Fe, Ni, Cu, Zn, Br, and Rb) was determined by comparison with a calibration obtained from the NBS orchard leaf standard, SRM 1571. In a comparative study with atomic absorption spectrophotometric (AAS) measurements of some elements in lathyrus sativus, the data were found to be in good agreement. The results obtained from the present study are discussed and compared with available data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02060417
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    Paper (German National Licenses)
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