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  • Polymer and Materials Science  (5)
  • 7.75  (1)
  • Computation  (1)
  • Retina
  • 1995-1999  (2)
  • 1990-1994  (5)
Collection
Keywords
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Binocular responses of neurons in the barn owl's visual Wulst (1994)
    Springer
    Journal of comparative physiology 174 (1994), S. 661-670 
    Details
    ISSN: 1432-1351
    Keywords: Stereo vision ; Disparity ; Spatial frequency ; Model ; Computation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Binocular responses have been recorded extra-cellularly at 58 sites in the barn owl's (Tyto alba) visual Wulst. Neurons showed disparity tuning to stimulation with moving bars, moving sinewave gratings and a moving visual-noise stimulus. Responses to sinewave gratings as a function of disparity were cyclic, with the period of a cycle of the response being correlated to one cycle of the stimulus. Cyclic responses were also found when bars or noise were used as a stimulus, but, especially in response to visual noise, one response peak, the main peak, was different from the other peaks, the sidepeaks: usually, the main peak was either higher or narrower or both higher and narrower than the sidepeaks. When the responses to different spatial frequencies were compared, response maxima coincided at the main peak, but not at the other peaks. In analogy to auditory physiology the disparity at which the frequency-independent peak occurs is termed ‘characteristic disparity’. Spatial-frequency tuning revealed broad tuning, ranging from 1 to more than 3 octaves at 50% of the maximal response. Disparity tuning was broad at the onset of the response and sharpened later. The data are discussed within the framework of a model for the neural representation of visual disparity that was derived from a model proposed earlier for the representation of interaural time difference, the main cue for encoding sound-source azimuths in the barn owl.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00192715
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  • 2
    Electronic Resource
    Electronic Resource
    Electron and ion beam induced heating effects in solids measured by laser interferometry (1993)
    Springer
    Applied physics 56 (1993), S. 385-390 
    Details
    ISSN: 1432-0630
    Keywords: 7.75 ; 78.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A sensitive interferometric technique has been applied for studying the thermal displacement of thin film heated by electron or ion beams. The steady state displacement has been measured and we discuss the dependence on material properties and film thickness showing that this method has a potential for in-situ monitoring of thin-film deposition or etching. Transient effects are studied in a thin quartz plate and the propagation velocity of thermal waves is measured.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00324360
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  • 3
    Electronic Resource
    Electronic Resource
    Werkstoffschädigung durch WasserstoffHerrn Prof. Dr. rer. nat. Dr.-Ing. E.h. Heinz Spähn zum 70. Geburtstag (1996)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 27 (1996), S. 259-266 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Hydrogen induced damage of steelsHydrogen may lead to spontaneous brittle failures, especially with higher strength materials; therefore, materials should be conservatively selected and design and fabrication of pressure bearing components have to be considered and followed with special care. The paper classifies failure cases due to hydrogen induced material's deterioration following the source and mode of hydrogen admittance and gives practical examples.
    Notes: Wasserstoff kann insbesondere bei höherfesten Werkstoffen zuspontanem, sprödem Versagen führen; deshalb sollten Werkstoffe für drucktragende Komponenten konservativ ausgewählt und deren Konstruktion und Fertigung mit der gebotenen Sorgfalt durchgeführt und überwacht werden. Im Beitrag werden praktische Schadensfälle durch Wasserstoffeinwirkung beschrieben und nach Quelle und Mechanismus des Wasserstoffeintritts in die Werkstoffe klassifiziert.
    Additional Material: 24 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19960270603
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  • 4
    Electronic Resource
    Electronic Resource
    High-density and optical non-linearity effects in epitaxially grown ZnTe layers (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Advanced Materials for Optics and Electronics 3 (1994), S. 33-39 
    Details
    ISSN: 1057-9257
    Keywords: High-density luminescence ; Non-linear transmission ; ZnTe ; Metal-organic vapour phase epitaxy ; Inelastic exciton scattering ; Electron-hole plasma ; Pump-and-probe method ; Exciton screening ; Band gap renormalization ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: We investigated the high-density luminescence and non-linear transmission of ZnTe layers grown by metal-organic vapour phase epitaxy (MOVPE). For the high-density luminescence we compared ZnTe layers on (001) GaAs substrate with free-standing ZnTe layers of equal thickness. At high excitation intensities a strong luminescence P band appears a few meV below the free exciton energy which is assigned to resonant exciton-scattering processes. A second strong luminescence N band occurs only in free-standing layers. It shows a remarkable red shift with increasing intensity and becomes the dominant emission for an excitation intensity Iexc 〉 1.5 MW cm-2. This lower-energy band was interpreted as electron-hole plasma recombination.The optical non-linearity of thin ZnTe layers in the excitonic region was investigated by pump-and-probe experiments at 2 K and room temperature (RT). For these experiments we used two different pump energies, one above (at 2 K and RT) and one below (at 2 K) the band gap energy. In all cases a red shift and a large non-linear decrease in the excitonic absorption with increasing pump intensity was observed. The experimental results can be explained by many-body effects of exciton screening.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/amo.860030106
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  • 5
    Electronic Resource
    Electronic Resource
    Ermittlung des Konzentrations/Zeit-Verlaufs eines aufgewirbelten Staubs in einer Apparatur zur Bestimmung der Mindestzündenergie mittels Phasen-Doppler-Anemometrie (1995)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 67 (1995), S. 1203-1203 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.3306709166
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  • 6
    Electronic Resource
    Electronic Resource
    49. Analyse eines Beschichtungsverfahrens zur Magnetbandherstellung mit Hilfe der numerischen Simulation (1993)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 65 (1993), S. 1078-1078 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330650951
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  • 7
    Electronic Resource
    Electronic Resource
    9. Photokatalytischer Abbau von Abwasserinhaltsstoffen mit Titandioxid und Wasserstoffperoxid (1993)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 65 (1993), S. 1050-1051 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330650911
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