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  • 1995-1999  (4)
  • 1990-1994  (5)
  • 1997  (4)
  • 1994  (5)
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  • 1995-1999  (4)
  • 1990-1994  (5)
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  • 1
    Electronic Resource
    Electronic Resource
    Detection of a 10−4 helium peak in a deuterium atmosphere using a modified high-resolution quadrupole mass spectrometer (1994)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 65 (1994), S. 1912-1917 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: This paper describes how a small helium (4He) peak can be separated from a large adjacent deuterium (D2) peak using a modified quadrupole mass spectrometer (QMS). This QMS utilized a condition of the second stability zone (zone II) in the Mathieu diagram. The minimum detectable peak ratio of 4He to D2 was 10−4 when a mass scan line was set close to the upper tip, and was 10−3 when the scan line was adjusted to the lower tip. The ion transmission rates simulating the peaks were calculated for the upper and lower zone conditions. It was found that a longer peak tail occurs when an unstable orbit has mainly a cosh function. From the experimental and theoretical data, it is concluded that the upper zone condition is the most suitable for realizing a high-resolution peak.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144842
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of bulk microdefects induced in heat-treated Czochralski silicon on dielectric breakdown of thermal SiO2 films (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 303-305 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We examine the effect of bulk microdefects (BMD) intentionally introduced in Czochralski silicon substrates by heat treatment on the dielectric breakdown of thermally grown SiO2 films. Transmission electron microscope observations reveal that the BMD consist of oxygen precipitates, perfect dislocation loops, and faulted dislocation loops. When the BMD are incorporated into the SiO2 film during thermal oxidation, an apparent decrease in the breakdown field is observed. The size of the oxygen precipitates has a clear relationship with the breakdown field: larger oxygen precipitate causes greater degradation. The dislocation loops are unrelated to the breakdown field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.111186
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    Paper (German National Licenses)
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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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    Paper (German National Licenses)
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  • 4
    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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    Paper (German National Licenses)
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  • 5
    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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    Paper (German National Licenses)
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  • 6
    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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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Preparation of ultrafine RuO2 and IrO2 particles by a sol-gel process (1994)
    Springer
    Journal of materials science 13 (1994), S. 1773-1774 
    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/BF00776354
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Analysis of stress intensity factors for three-dimensional cruciform cracks (1994)
    Springer
    International journal of fracture 66 (1994), S. 339-355 
    Details
    ISSN: 1573-2673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The stress intensity factors for three-dimensional cruciform surface cracks in a semi-infinite body are numerically calculated by the body force method. Mindlin's point force solution is used for the derivation of basic equations to express the influence coefficient of triangular elements, into which the crack is divided. The interactions between crossed crack planes as well as contact between crack surfaces are considered in the iterative manner. Stress intensity factors for a cruciform median crack and a cruciform semicircular crack under a point force on the surface of a semi-infinite solid are analyzed. The possibility of growth of a median crack toward the free surface of the semi-infinite solid is discussed. A cruciform semicircular surface crack under remote uniaxial tension, or under combined tension and compression is also analyzed. The effect of contact of crack surfaces on stress intensity factors is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00018438
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Gastrointestinal invasion by herpes simplex virus type 1 inoculated cutaneously into the immunosuppressed mice (1994)
    Springer
    Archives of virology 134 (1994), S. 97-107 
    Details
    ISSN: 1432-8798
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The pathogenesis of infection in mice with herpes simplex virus type 1 (HSV-1) strain 7401H was studied. Mice immunosuppressed by intraperitoneal injection of cyclophosphamide were inoculated cutaneously into the flank with the virus and developed severe zosteriform skin lesions. All of them died within 2 weeks after the infection, while most of the normal mice survived the viral infection with healing of the lesions. In the gastrointestinal tract of the immunosuppressed mice, macroscopic abnormalities were frequently observed, and infectious viruses were detected on days 7 to 9. The viruses were also detectable in the dorsal root ganglia and the spinal cord of thoracolumbar area on days 5 to 7, and in the celiac plexus on day 7. However, no viruses were detected in the blood. Immunohistological examination of the gastrointestinal tract revealed that the viral antigens were localized in Auerbach's myenteric plexus. These results suggest that HSV-1 inoculated into the flank skin invaded the gastrointestinal tract via the nervous system, which gastrointestinal involvement might possibly have caused the death of the mice.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01379110
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    Paper (German National Licenses)
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