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  • 1990-1994  (4)
  • 1991  (4)
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  • 1990-1994  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    Participation of Ia reciprocal inhibitory neurons in the spinal circuitry of the tonic neck reflex (1991)
    Springer
    Experimental brain research 84 (1991), S. 461-464 
    Details
    ISSN: 1432-1106
    Keywords: Tonic neck reflex ; Ia inhibitory neurons ; Neck receptors ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary As part of our studies of the spinal circuitry of the tonic neck reflex, we have recorded extracellularly from Ia reciprocal inhibitory neurons of the decerebrate, labyrinthectomized cat. The activity of a majority of neurons driven by stimulation of the quadriceps nerve was modulated by sinusoidal rotation of the neck; such modulation was much less frequent in the case of neurons driven by stimulation of nerves to more distal muscles. The results suggest that some of the inhibition which is part of the tonic neck reflex is mediated by Ia reciprocal inhibitory neurons, but that other pathways must also play an important role.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00231470
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Thermal expansion characteristics of PEEK composites (1991)
    Springer
    Journal of materials science 26 (1991), S. 2259-2271 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The thermal expansion behaviour of several fibre-reinforced PEEK composites is assessed. It is shown that thermal expansion behaviour is consistent, and changes in a predictable manner with changes in fibre type. Using a composite manufactured such that no interfacial bonding took place, it is demonstrated that compressive forces caused by differential thermal contraction of fibre and matrix are sufficiently large to dominate behaviour in a direction parallel to the fibres. This suggests that PEEK composites should be resistant to changes in thermal expansion behaviour with repeated thermal cycling, and such resistance is demonstrated for AS4/PEEK (APC-2/AS4). It is shown that conventional models for predicting laminate response from unidirectional composite properties are valid for such materials, but it is also shown that the common analytical models for calculating transverse fibre behaviour from composite properties are inaccurate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00549197
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Influence of temperature and hydrostatic pressure on moisture absorption in polymer resins (1991)
    Springer
    Journal of materials science 26 (1991), S. 49-55 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Polyester resins are widely used as the matrix in glass fibre-reinforced polymer composites. Moisture absorption has an adverse effect on their mechanical properties. Examination of two cured unsaturated polymers, Stypol R1067/32 and R1067/26, at various temperatures and hydrostatic pressures has shown that the saturation level of moisture in R1067/26 is independent of both temperature and pressure, but in R1067/32 at 5 °C the level depended on pressure. The temperature dependences of the diffusivities were found to be well described by Arrhenius expressions. The diffusivities were found to decrease slightly with increasing pressure, the effect being largest at the highest temperature, in qualitative agreement with theories based on changes in the free volumes in the polymers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00576031
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Absorption of silicone fluid in a silicone elastomer (1991)
    Springer
    Journal of materials science 26 (1991), S. 6-10 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Measurements have been made of the absorption properties of a silicone fluid in a silicone elastomer, Aircast 3700, at temperatures between 0 and 150 °C. It was found that the diffusivity could be described by Arrhenius' law. The saturation fluid content was 20% at 0 °C, decreasing to 17% at 120 °C. The swelling was large, up to 26% at saturation, and approximately equalled the volume of fluid absorbed. A “reverse thermal effect” was observed and an attempt has been made to explain it.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00576024
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    Paper (German National Licenses)
    Fulltext
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