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  • 2000-2004
  • 1995-1999
  • 1985-1989  (6)
  • 1987  (3)
  • 1985  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Photoconductance transient response in polycrystalline silicon (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 338-344 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The photoconductance transient response in polycrystalline silicon has been studied theoretically and experimentally. Shockley–Read–Hall statistics are used to describe the emission and capture processes at the grain-boundary traps. Under appropriate conditions, the minority carrier capture and emission time constants of the grain-boundary trap can be directly obtained from the photoconductance transient response. The photoconductance method is therefore useful for studying grain-boundary deep level states. The special case when a focused laser spot is employed is also discussed. From the experimental data obtained from large-grain Wacker polycrystalline silicon, we have discovered a donor-like level at 0.48 eV below the conduction band with a concentration of 2×1010 cm−2. The electron (minority carrier) lifetime is found to be about 6×10−10–10−9 s.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.334811
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Defect levels in electrodeposited n-type CdTe thin films (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 2234-2243 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Admittance spectroscopy is used to measure electron traps near the conduction band of the n-type electrodeposited CdTe thin films. Several samples of Ni-CdTe Schottky-barrier and Ni-TeO2-CdTe devices are used in the measurement. Two donor levels with activation energies around 0.12 eV and between 0.19 and 0.26 eV are detected. In addition, there may be one or more shallow donor levels within 0.04 eV from the conduction band. Capacitance loops are observed in the capacitance-voltage measurements performed at different temperatures and bias sweep rates. The activation energies, densities, and electron-capture cross sections of the two slow electron-trap levels responding to the cyclical ramp bias are estimated. The rise and decay photocapacitance transient measurements at 295 K reveal two electron-trap levels with photoionization threshold energies of 0.8 and 1.3 eV. These two levels are suspected to correspond to the other two slow electron-trap levels estimated in the capacitance-voltage measurement and located around or above the midgap. The differences between thermal and optical ionization energies and the slow electron-capture rates of these two levels may be explained by the nonradiative, thermally activated capture processes with large lattice relaxation. Numerous defects around and below the midgap are detected by the steady-state photocapacitance measurement at 100 K. A band of seven defect levels spreading within 0.6 to 1.0 eV is observed. Large capacitance changes are recorded at 1.37, 1.41, and 1.45 eV. These three levels are speculated to be the major compensating acceptor levels. Based on both the photocurrent and photocapacitance measurements, electrons emitted from the 1.02-, 1.06-, 1.21-, and 1.28-eV levels are believed to arise from the defects at the TeO2-CdTe interface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.337985
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Intracranial epidermoids—Concerning the low absorption value on computerized tomography (1985)
    Springer
    Acta neurochirurgica 78 (1985), S. 33-37 
    Details
    ISSN: 0942-0940
    Keywords: Intracranial epidermoid ; computerized tomography ; absorption value ; metrizamide CT scan
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The authors analysed the contents of two intracranial epidermoids showing low density on computerized tomography. Although both cases had approximately similar composition, 85, 83% for water, 12,12.5% for protein, 3,4.5% for total lipid including cholesterol, respectively, the absorption values differed from each other. Both tumours were identified to communicate with CSF, one by delayed metrizamide CT scan and the other by direct aspiration during operation. The low absorption values in both cases resembled or were slightly higher than that of CSF in each case, and not a single pixel showed negative values for lipid. These findings suggest that it is the CSF content within the anatomical interstices or structural crevice of the tumour, rather than cholesterol, which is responsible for the low absorption values which appeared in the CT scan.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01809238
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Surgical management of total degloving injuries of the hand (1987)
    Springer
    European journal of plastic surgery 10 (1987), S. 47-50 
    Details
    ISSN: 1435-0130
    Keywords: Hand degloving ; Tube pedicles ; Buried hand ; Free flaps
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The treatment of degloving injuries of the hand is presented. Older methods are discussed. The only procedures which give good results are a combination of flaps, pedicled of free vascularized, and skin grafts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00578371
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Global reachability results for systems with constrained controllers (1985)
    Springer
    Journal of optimization theory and applications 46 (1985), S. 581-590 
    Details
    ISSN: 1573-2878
    Keywords: Controllability ; reachability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract The global reachability problem is to determine if, given a specified initial state, the state of a system can be steered via an admissible control to every point in the state space. This paper addresses the problem of global reachability when there are magnitude constraints on the controls. Necessary conditions and sufficient conditions for a system to be globally reachable are presented. The results are compared with those available for the global controllability problem.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00939161
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Thermal analysis studies on thermoplastic rigid rod molecular compositesResearch was conducted on U.S. Air Force Contract No.F3316-84C-5020. (1987)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 27 (1987), S. 1557-1561 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Rigid rod molecular composites involve molecular level mixing of two polymers having greatly disparate chain conformations (one rodlike and one flexible coil like). Morphology studies have shown that in such materials the bundle diameter of these rigid rod molecules is less than 5 nm. The rigid rod molecule used is poly(para-phenylene benzobisthiazole) (PPBT). The thermoplastic flexible polymer matrix is Nylon-66, DuPont's Zytel 42. Thermal analysis studies on these materials indicate that the expected Tg shifts, as observed for blends of two flexible polymers, and depression of Tm with increased rod molecule composition does not occur.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760272010
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    Paper (German National Licenses)
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