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  • 1970-1974  (347)
  • 1974  (347)
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  • 1970-1974  (347)
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  • 1
    ISSN: 1573-4803
    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
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  • 2
    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 It has been shown that the direct piezoelectric effect occurs in low density, extruded polyethylene cable insulators and a piezoelectric d constant typical for such samples has been evaluated. Heat-treatment of the polyethylene, and oil absorption into it, both reduced the level of charge output. A probable mechanism for the piezoelectric effect in these polyethylene samples is given.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 9 (1974), S. 1585-1589 
    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 A qualitative working model is presented in this paper for the development of tough ceramics. The model shows that toughness can be imparted only to dispersed multiphase ceramics in preference to single phase ceramics. A simultaneous improvement in strength can be achieved by securing a strong bond between the dispersed phase and the matrix. Eutectic composites of mixed oxides merit serious consideration as potential tough ceramics.
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  • 4
    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 A number of chalcogenide glasses were investigated for thin film switching applications. Two ranges of threshold voltage were of interest, 15 and 30 V. The switching performance of thin film devices was evaluated and rated on a simple numerical scale. The memory glasses based on the Ge-Te eutectic gave generally satisfactory performance. Selenium-based glasses exhibited high threshold voltage in thin film form, but had limited lifetime. Threshold voltages of about 30 V were obtained from Bi-As-Se glasses; these proved difficult to lock “ON” and possible reasons for this are discussed. Measurements on the bulk properties were used to give an indication of the properties to be expected from thin films of the corresponding glasses.
    Type of Medium: Electronic Resource
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  • 5
    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 fracture behaviour of notched specimens of polymethylmethacrylate has been examined for a wide range of geometries in Charpy impact tests, and in tensile and slow bend fracture tests. It was found that the failure of the very sharply notched specimens was consistent with linear elastic fracture mechanics and defined a constant fracture toughness K IC for a constant notch tip radius, whereas the blunt notched specimens failed at a constant critical stress at the root of the notch.
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  • 6
    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 quantitative relationship between creep and recovery which had been previously developed by Mindel and Brown [1] has been applied to interrupted creep tests. Single and multiple interruptions (fatigue) were investigated. In general it was observed that interruptions decreased the time to failure. The experiments were conducted in compression in the range of high stresses. Failure was caused by excessive deformation or accelerated creep which is produced by a softening mechanism that is common to all linear polymers. The temperature changes associated with the creep and recovery parts of the cyclic loading were measured. The temperature rise during loading exceeds the decrease during unloading so that there is a net rise in temperature if the creep and recovery intervals are equal. However, the temperature change is not the primary cause for the decrease in time-to-failure for cyclic loading as compared to the failure time during steady stress creep. It has been concluded that fatigue failure under compressive deformation is related fundamentally to the constant stress creep curve.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 9 (1974), S. 1689-1695 
    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 surface properties and microstructure of ultrafine oxide powders prepared by vapour phase condensation have been examined by several techniques (electron microscopy, X-ray diffraction, nitrogen adsorption isotherms, infra-red absorption of surface species). All the powders had a very small particle size (〈20 nm), and gave type II adsorption Isotherms — typical of non-porous adsorbents. From infra-red absorption studies of water adsorbed on the surface of the oxides, an unusually relaxed and unreactive surface was indicated. The compaction and sintering characteristics of the powders were exceptional, and made them highly suited for ceramic fabrication. The contrasting behaviour of an ultrafine magnesia, consisting of porous pseudomorphic agglomerates, is demonstrated.
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  • 8
    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 A eutectic composite material with the mixed spinel cobalt ferrite-cobalt titanate and the perovskite barium titanate as co-existing phases has been prepared, which shows a magnetoelectric effect due to the mechanical coupling of the piezomagnetic spinel and the piezoelectric perovskite. The maximum value of the magnetoelectric effect ΔE/ΔH obtained up till now is 5.0 × 10−2 V cm−1 Oe−1 at room temperature.
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  • 9
    ISSN: 1573-4803
    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
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  • 10
    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 effects of draw ratio and drawing temperature on the lattice distortion and size of mosaic block crystals during the deformation process of lamellar crystals were investigated by X-rays for bulk crystallized polyethylene samples with different thermal histories: a sample slowly cooled from the melt, a quenched sample, and an annealed sample. With a small draw ratio, the mosaic block sizes were reflected in the thermal histories of the starting samples, but they decreased rapidly on further drawing and became almost constant in the highly drawn state, being independent of the original values. However, during the drawing process, the distortion parameters did not undergo such a large change as the crystallite size. Increase in the drawing temperature resulted in an increase in crystallite size. Based on the remarkable decrease in crystallite size upon drawing, a hypothesis to explain the formation of fibre structure was proposed.
    Type of Medium: Electronic Resource
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