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  • Articles: DFG German National Licenses  (14)
  • 1995-1999  (14)
  • 1997  (4)
  • 1996  (10)
  • 1
    Electronic Resource
    Electronic Resource
    Degradation of dielectric breakdown field of thermal SiO2 films due to structural defects in Czochralski silicon substrates (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 7944-7957 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We used heat treatment to intentionally introduce various structural defects in Czochralski silicon substrates. The type, size, and number density of the induced defects were surveyed with transmission electron microscopy, and the defects were then incorporated into SiO2 films (10–50 nm thick) during thermal oxidation in dry O2. The effect of the defects on dielectric strength of the SiO2 films was examined with a time zero dielectric breakdown method. Larger platelet oxygen precipitates caused greater decreases of the breakdown field, and precipitates smaller than the SiO2 film thickness did not appreciably reduce the breakdown field. Every large platelet oxygen precipitate incorporated in the SiO2 film caused a degradation. Octahedral oxygen precipitates caused little degradation. The breakdown field was higher than 7 MV/cm and did not depend much on the SiO2 film thickness and precipitate size. We discussed possible mechanisms for the degradation due to both kinds of precipitates. Oxidation-induced stacking faults formed by a surface oxidation did not markedly reduce the breakdown field when only segments of dislocations and stacking faults were incorporated in the SiO2 film. Another serious degradation was caused by pits that were formed by dissolving octahedral oxygen precipitates in a HF solution. The breakdown field was lower for thicker oxide films, and it recovered as the pit shape became smoother during chemical etching. We proposed that this degradation was caused by a local thinning of SiO2 film due to stress generated in the oxidation of pits. These results suggest that voids rather than the other reported grown-in defects play the most important role in the degradation observed for as-grown silicon. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362344
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Terahertz radiation from superconducting YBa2Cu3O7−δ thin films excited by femtosecond optical pulses (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 2122-2124 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Ultrashort electromagnetic waves (600 fs width) from superconducting YBCO thin films have been observed by irradiating current-biased samples with femtosecond optical laser pulses (80 fs width). The Fourier component of the pulse extends up to ∼2 THz. The characteristics of the radiation are studied and the radiation mechanism is ascribed to the ultrafast supercurrent modulation by the laser pulses, which induce the nonequilibrium superconductivity. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.117175
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  • 3
    Electronic Resource
    Electronic Resource
    A NEW METHOD FOR THE MEASUREMENT OF MODE II FATIGUE THRESHOLD STRESS INTENSITY FACTOR RANGE ΔKτth (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Fatigue & fracture of engineering materials & structures 20 (1997), S. 0 
    Details
    ISSN: 1460-2695
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract— In order to evaluate the threshold value ΔKτth for mode II fatigue crack growth, a new measurement method of mode II fatigue crack growth has been developed. This method uses a conventional closed-loop tension—compression fatigue testing machine without additional loading attachments. Mode II fatigue tests for structural steel and rail steel have been carried out. This method has proved successful and has reproduced mode II fatigue fracture surfaces similar to those found in the spalling of industrial steel-making rolls. The crack length during testing was measured by an AC potential method. The relationships between da/dN and ΔKτ and AKτth for several materials have been obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1460-2695.1997.tb01530.x
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  • 4
    Electronic Resource
    Electronic Resource
    Formation mechanism of anomalous “golf ball-like” composite polymer particles by seeded emulsion polymerization (1996)
    Springer
    Colloid & polymer science 274 (1996), S. 520-524 
    Details
    ISSN: 1435-1536
    Keywords: Composite polymer particle ; emulsion polymerization ; morphology ; anomalous shape ; phase separation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Recently, the authors found that anomalous polystyrene/polybutyl acrylate composite particles, whose surfaces had many dents, were produced by emulsifier-free seeded emulsion polymerization of butyl acrylate with polystyrene seed particles. Such a particle was named a “golf ball-like” particle. In this article, the morphology and the formation mechanism of the golf ball-like composite polymer particles were studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00655226
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  • 5
    Electronic Resource
    Electronic Resource
    Age-related changes in the compound action potentials of the eighth nerve in guinea pigs (1997)
    Springer
    European archives of oto-rhino-laryngology and head & neck 254 (1997), S. 145-149 
    Details
    ISSN: 1434-4726
    Keywords: Eighth nerve compound action potential ; Aging effects ; Guinea pig
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The eighth nerve compound action potential (CAP) in 95 guinea pigs was measured using click stimuli to investigate age-related changes in their neural auditory thresholds. The animals were separated into three groups: group A (n = 43, 86 ears; 2–4 months old); group B (n = 29; 58 ears, 13–15 months old); and group C (n = 23; 46 ears, 23–25 months old). With increasing age, a gradual elevation of CAP thresholds was clearly seen among the three groups. The negative peak (N1) latencies of the CAP were prolonged, and the N1 amplitudes of the CAP decreased. There were significant differences in N1 latencies among the three groups and in N1 amplitudes between groups A and B, and between groups A and C. However, the rate of decline of the thresholds as well as the input-output function curves of the CAP varied in some of the oldest animals, suggesting that there were some individual differences in degenerative aging processes of the auditory system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02471279
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  • 6
    Electronic Resource
    Electronic Resource
    The relationship between orthostatic dysregulation and the orthostatic test in dizzy patients (1996)
    Springer
    European archives of oto-rhino-laryngology and head & neck 253 (1996), S. 268-272 
    Details
    ISSN: 1434-4726
    Keywords: Orthostatic dysregulation ; autonomic imbalance ; Dizziness ; Orthostatic test
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The orthostatic test was administered to 134 dizzy patients (37 males and 97 females) who were identified as having orthostatic dysregulation from December 1990 through November 1994. The mean age of the male and female patients was 42.5 and 44.6 years, respectively, and the peak age decade was the 50s. Among the questionnaire items for orthostatic dysregulation, orthostatic dizziness was the most frequent major symptom and occurred in 116 of the patients (86.6%). Fatigue was the most frequent minor symptom and was found in 97 (72.4%). The incidence of positive orthostatic test results in the patients with orthostatic dysregulation (50.7%) was significantly higher (P 〈 0.01) than that in the control subjects (27.8%). There was also a significant difference (P 〈 0.01 or P 〈 0.05) between systolic pressure decrease during the orthostatic test procedure in the patients with orthostatic dysregulation and that in the control subjects. These results suggest that autonomic imbalance as reflected by the orthostatic dysregulation questionnaire and orthostatic test results is closely related to the occurrence of dizziness or vertigo.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00171141
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  • 7
    Electronic Resource
    Electronic Resource
    Low-temperature selective reduction of NO with propene over alkaline-exchanged mordenites (1997)
    Springer
    Catalysis letters 45 (1997), S. 267-269 
    Details
    ISSN: 1572-879X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Partially protonated alkaline mordenites showed higher activity per acid amount below 573 K than acidic zeolites for the selective reduction of NO with C3H6 in the presence of O2, which can be related to a high concentration of NO3 - species in the zeolite channels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019084116328
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  • 8
    Electronic Resource
    Electronic Resource
    Phase equilibria and phase change during ageing in the ZrO2-- Y2O3 system (1997)
    Springer
    Journal of materials science 16 (1997), S. 1686-1688 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018538400981
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  • 9
    Electronic Resource
    Electronic Resource
    Phase relation and properties of oxynitride glasses in the Si3N4-Yb2O3-SiO2 system (1996)
    Springer
    Journal of materials science 15 (1996), S. 1271-1272 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00274398
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  • 10
    Electronic Resource
    Electronic Resource
    Abnormal cell divisions in leaf primordia caused by the expression of the rice homeobox geneOSH1 lead to altered morphology of leaves in transgenic tobacco (1996)
    Springer
    Molecular genetics and genomics 251 (1996), S. 13-22 
    Details
    ISSN: 1617-4623
    Keywords: Homeobox gene ; In situ hybridization ; Leaf morphology ; Transgenic tobacco
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Transgenic tobacco plants were generated carrying a rice homeobox gene,OSH1, controlled by the promoter of a gene encoding a tobacco pathogenesis-related protein (PR1a). These lines were morphologically abnormal, with wrinkled and/or lobed leaves. Histological analysis of shoot apex primordia indicated arrest of lateral leaf blade expansion, often resulting in asymmetric and anisotropic growth of leaf blades. Other notable abnormalities included abnormal or arrested development of leaf lateral veins. Interestingly,OSH1 expression was undetectable in mature leaves with the aberrant morphological features. Thus,OSH1 expression in mature leaves is not necessary for abnormal leaf development. Northern blot and in situ hybridization analyses indicate thatPR1a-OSH1 is expressed only in the shoot apical meristem and in very young leaf primordia. Therefore, the aberrant morphological features are an indirect consequence of ectopicOSH1 gene expression. The only abnormality observed in tissues expressing the transgene was periclinal (rather than anticlinal) division in mesophyll cells during leaf blade initiation. This generates thicker leaf blades and disrupts the mesophyll cell layers, from which vascular tissues differentiate. TheOSH1 product appears to affect the mechanism controlling the orientation of the plane of cell division, resulting in abnormal periclinal division of mesophyll cell, which in turn results in the gross morphological abnormalities observed in the transgenic lines.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02174339
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