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  • 1985-1989  (5)
  • 1980-1984  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Lipid and subunit III depleted cytochrome c oxidase purified by horse cytochrome c affinity chromatography in lauryl maltoside (1983)
    s.l. : American Chemical Society
    Biochemistry 22 (1983), S. 3178-3187 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00282a022
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Solid phase epitaxial regrowth of Si1−xGex/Si strained-layer structures amorphized by ion implantation (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 42-44 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Strained-layer structures consisting of ∼30–35 nm Si1−xGex (x=0.16–0.29) and 33 nm Si deposited by molecular beam epitaxy on a (100)Si substrate have been amorphized by ion implantation at 40 K with 120 keV As+. Rutherford backscattering/channeling measurements using 2 MeV He+ ions have been used to measure the thickness of the amorphous layer and monitor the subsequent epitaxial regrowth occurring as a result of annealing at 560–600 °C. Angular scans across the {110} planar channels indicate that the initial crystallinity and strain was recovered for x=0.16; however, for x=0.29 crystal quality was greatly reduced and the coherency at the substrate-alloy layer interface was destroyed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100828
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Planar channeling in GaAs/InxGa1−xAs/GaAs strained-layer structures (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 1510-1515 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Planar {110} channeling measurements with 1–2-MeV He+ ions have been used to investigate strained-layer structures of (100) GaAs/InxGa1−xAs/GaAs with x=0.07–0.17. Beam-steering effects in the surface GaAs layer are observed to have a major influence on {110} planar angular scans carried out in the InxGa1−xAs layers resulting generally in a double or more complex-shaped angular dip. A simple computer simulation has been developed which determines the main features of the experimental angular scan data. Comparison of simulation and experimental data allows a reasonable determination of the kink angle θK between the {110} planes for the surface GaAs and underlying strained layer. Only in limiting cases is it possible to unequivocally determine θK from the experimental data alone. They are as follows: (i) when θK=0; (ii) θK〉2ψ pc (ψ pc is the critical angle for {110} planar channeling); and (iii) when the thickness t of the top layer is thin (t(very-much-less-than)2d/ψ pc, where d is the {110} interplanar spacing).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342966
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The effect of aluminum ion implantation on the oxidation of an Fe-6 at.% Al alloy at 1173 K (1987)
    Springer
    Oxidation of metals 28 (1987), S. 259-276 
    Details
    ISSN: 1573-4889
    Keywords: Oxidation ; Fe-Al alloys ; Al implantation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Samples of an Fe-6 at.% Al alloy were implanted with doses of 5×1016−3×1017 Al+ ions/cm2 at 100 kV, and subsequently oxidized at 1173 K in O2 gas at 27 kPa. By comparison with the behavior of unimplanted specimens, no effect on oxidation was observed if the dose of implant was less than 1×1017 Al+ ions/cm2. At doses of 1×1017 Al+ ions/cm2 or higher, a change in the oxide scaling morphology was effected from a duplex α-Fe2O3-α-Al2O3 scale to an α-Al2O3-enriched film with a dispersion of α-Fe2O3 nodules. Oxygen uptake by the high-dose samples was due principally to nodule formation and weight gains after 45 hr were lower by 50–70% as compared with the unimplanted material. Nucleation and growth of the nodules occurred only within the first 5 hr of reaction, but their presence acted as an upper limit on the benefits provided by implantation of aluminum. Nodule formation was shown to be characteristic of the oxidation properties of the alloy material, not an extraneous feature introduced by the implantation process itself. Surface preparation prior to implantation had little effect on oxidation: high-dose electropolished samples behaved similarly to mechanically polished samples when implanted to comparable doses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00666722
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    The effects of image degradation on retinal illuminance and pattern responses to checkerboard stimuli (1987)
    Springer
    Documenta ophthalmologica 66 (1987), S. 267-275 
    Details
    ISSN: 1573-2622
    Keywords: contrast ; image degradation ; pattern ERG ; retinal illuminance ; spatial frequency
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The contrast of a retinal image is less than that of the external stimulus owing to a process of optical degradation. Theoretical studies have shows that this affects the pattern and illuminance detectors of the retina differently and provides a new insight into the nature of contrast stimulation and the mechanisms responsible for the pattern electroretinogram. Consensus data on the optical transfer function of the eye are applied to the Fourier transform of the pattern stimulus and the retinal illuminance distribution is determined. The checkerboard image is shown to undergo substantial degradation for those check sizes used in experimental and clinical observations. Current concepts of contrast and modes of stimulation are examined and methods are described for quantifying the effects on stimulation of illuminance and pattern detectors. The findings are applied to experimental data on spatial tuning functions of electroretinograms elicited by checkerboard pattern stimulation. It is concluded that the signal predominantly originates from local illuminance, but that this can account for only part of the response with small check sizes. The remainder must be a highly selective response to spatial frequency. If the predicted degradation is accepted, a similar conclusion must be reached for many previously reported tuning functions of the pattern electroretinogram as well as to the present experiment on eight normal eyes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00145241
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Computation of the luminance and pattern components of the bar pattern electroretinogram (1987)
    Springer
    Documenta ophthalmologica 66 (1987), S. 233-244 
    Details
    ISSN: 1573-2622
    Keywords: bar pattern ; electroretinogram luminance ; pattern ERG
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Pattern onset electroretinograms (PERGs) were recorded from four normal subjects. Square-wave gratings of 75% contrast were presented in three approximately contiguous, concentric zones of outer angular radius, 5.1°, 12.6°, and 23.6°. The zones were calculated to give equal numbers of ganglion cell receptive fields. The recorded PERGs were considered to include luminance and pattern components which have low and bandpass spatial tuning functions respectively. These components combine in the PERG to produce a broad spatial tuning characteristic. The amplitude of PERGs in response to low spatial frequency stimuli is widely reported to be linearly related to contrast. The retinal illuminance response at every spatial frequency was computed from the eye's modulation transfer function. This function characterizes the reduction in contrast that occurs because of optical degradation. The computed retinal illuminance response was subtracted from the PERG waveform and a pattern-specific response was revealed. The latter had a highly tuned bandpass function which peaked at higher spatial frequencies than the PERG at corresponding peripheral angles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00145237
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    Paper (German National Licenses)
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