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  • Articles  (26)
  • Springer  (23)
  • Wiley  (3)
  • 2000-2004  (16)
  • 1965-1969  (10)
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (21)
  • Process Engineering, Biotechnology, Nutrition Technology  (5)
  • Political Science
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  • Articles  (26)
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  • 1
    Electronic Resource
    Electronic Resource
    Finite Element Modelling of Failure of a Multi-Material Target due to High Velocity Space Debris Impacts (2000)
    Springer
    Space debris 2 (2000), S. 41-50 
    Details
    ISSN: 1572-9664
    Keywords: element erosion ; failure criteria ; high velocity impacts ; non-linear finite elements ; space debris
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Lagrangian finite element methods have been used extensively in the past to study the non-linear transient behaviour of materials, ranging from crash tests of cars to simulating bird strikes on planes. However, as this type of space discretisation does not allow for motion of the material through the mesh when modelling extremely large deformations, the mesh becomes highly distorted. This paper describes some limitations and applicability of this type of analysis for high velocity impacts. A method for dealing with this problem by the erosion of elements is proposed, where the main driver is the definition of element failure strains. Results were compared with empirical perforation results and were found to be in good agreement. The results were then used to simulate high velocity impacts upon a multi-layered aluminium target in order to predict a ballistic limit curve. LS-DYNA3D was used as the FE solver for all simulations. Meshes were generated using Truegrid.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1015698307894
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  • 2
    Electronic Resource
    Electronic Resource
    Residual fructose and osmolality affect the levels of pneumocandins B0 and C0 produced by Glarea lozoyensis (2000)
    Springer
    Applied microbiology and biotechnology 54 (2000), S. 814-818 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract A high total pneumocandin titer (B0 + C0) with a low percentage of the structural isomer pneumocandin C0 was achieved by carrying out fermentations of Glarea lozoyensis at a high residual fructose concentration (125 g/l initial). When the fermentation was carried out at a low residual fructose concentration (40 g/l initial), pneumocandin production increased by 34%. However, a disproportionate increase in the level of pneumocandin C0 synthesized (250% increase vs 30% increase for pneumocandin B0) was observed. Midcycle addition of 150 mM NaCl or 116 mM Na2SO4 to low residual fructose fermentations returned the titer and isomer levels to those seen for the high residual fructose fermentation. The increase in pneumocandin C0 synthesis under low residual fructose conditions appears to be linked to the increase in the synthesis of trans-4 hydroxyproline, with the synthesis of trans-3 hydroxyproline remaining unaffected. This suggests that the formation of pneumocandin C0 is the result of a misincorporation of trans-4 hydroxyproline instead of trans-3 hydroxyproline by the pneumocandin peptide synthetase, and that the amount of trans-4 hydroxyproline formed dictates the frequency of this misincorporation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002530000447
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  • 3
    Electronic Resource
    Electronic Resource
    Whole-field density measurements by ‘synthetic schlieren’ (2000)
    Springer
    Experiments in fluids 28 (2000), S. 322-335 
    Details
    ISSN: 1432-1114
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract  This paper outlines novel techniques for producing qualitative visualisations of density fluctuations and for obtaining quantitative whole-field density measurements in two-dimensional density-stratified flows. These techniques, which utilise image processing technology, are much simpler to set up than the classical schlieren and interferometry methods, and provide useful information in situations where shadowgraph is of little or no value. Moreover, they may be set-up to analyse much larger domains than is feasible with the classical approaches, and do not require high quality optical windows in the experimental apparatus. Ultimately the greatest strength of these techniques is the ability to extract accurate, quantitative measurements of the density field. Application of these techniques is illustrated by an internal wave field produced by an oscillating cylinder. Recent theoretical advances for this classical problem make it the ideal test bed. Results are presented for both a circular and a square cylinder oscillating vertically in a linear stratification. Further aspects of the techniques are illustrated by considering thermal convection from a hand and flow over an obstacle towed through a density stratified fluid.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003480050391
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  • 4
    Electronic Resource
    Electronic Resource
    Magnetisation of superconducting carbides (1967)
    Springer
    Journal of materials science 2 (1967), S. 496-498 
    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
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00562956
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  • 5
    Electronic Resource
    Electronic Resource
    RTM Hemp Fibre-Reinforced Polyester Composites (2000)
    Springer
    Applied composite materials 7 (2000), S. 341-349 
    Details
    ISSN: 1573-4897
    Keywords: plant fibres ; hemp ; reinforced composites ; polyester ; RTM ; flexural stress ; impact strength ; interfacial bonding ; esterification ; microcompressive defects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Hemp fibre-reinforced polyester composites were prepared using a Resin Transfer Moulding (RTM) technique and the flexural and impact behaviour investigated. Flexural stress at break and flexural modulus showed an increasing trend with fibre content. Impact strength was found to decrease at low fibre content, then gradually increase with further addition of fibres. A strong interfacial adhesion between hemp and polyester was obtained using chemically modified hemp. This modification consisted in introducing reactive vinylic groups at the surface of the fibres, via esterification of hemp hydroxyl groups, using methacrylic anhydride. Increased bonding between fibres and matrix did not affect the flexural stress at break of the composite but was detrimental to toughness. This behaviour was ascribed to a change in the mode of failure, from fibre pull-out to fibre fracture, resulting in a marked reduction in the energy involved in the failure of the composite, leading to a more brittle material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026538107200
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  • 6
    Electronic Resource
    Electronic Resource
    Book reviews (1967)
    Springer
    Journal of materials science 2 (1967), S. 302-306 
    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
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00555393
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  • 7
    Electronic Resource
    Electronic Resource
    Effect of microstructure on superconducting properties of Mo/34 at.% Re alloy (1968)
    Springer
    Journal of materials science 3 (1968), S. 191-205 
    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 effect of deformation and heat-treatments on magnetisation of superconducting Mo/34 at.% Re alloy was investigated. The microstructure was studied using optical and electron microscopy. The values of the parameterκ of the GLAG theory were determined by using three different methods, and they are found to be in accordance with some of the predictions of the Maki theory. The results show that in deformed specimens the magnetic hysteresis is mainly due to the interaction of Abrikosov supercurrent vortices with dislocation tangles; both twin boundaries and grain boundaries are relatively ineffective in causing flux hindrance. The hysteresis observed after annealing has been explained in terms of the occurrence of dislocation rearrangement and the precipitation of the sigma phase. Flux-pinning by dislocation tangles has been treated as a special case of pinning by normal particles and a magnitude of the resulting pinning force is obtained. The experimental results are compared with the predictions of a theoretical model of flux-pinning.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00585488
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  • 8
    Electronic Resource
    Electronic Resource
    The slip casting and mechanical characterisation of magnesium-alumino-silicate glass-ceramics (2000)
    Springer
    Journal of materials science 35 (2000), S. 4827-4832 
    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 An investigation of the slip preparation and casting of two magnesium-alumino-silicate glass powders has demonstrated the particular importance of the control of particle size distribution and slip viscosity in fabricating uniform glass-ceramics by powder methods. Measurement of strength and fracture toughness of fired material, coupled with particle size analysis and scanning electron microscopy has allowed interpretation of the quality of the material produced in terms of strength limiting flaws. Suggestions for the improvement of this type of material are made.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004880930614
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  • 9
    Electronic Resource
    Electronic Resource
    Strain induced shifts in the Raman spectra of natural cellulose fibers (2000)
    Springer
    Journal of materials science 19 (2000), S. 721-723 
    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:1006787300815
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  • 10
    Electronic Resource
    Electronic Resource
    Superconductivity in deformed niobium alloys (1966)
    Springer
    Journal of materials science 1 (1966), S. 317-335 
    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 A brief review of deformation structure in bcc metals is given and the main features of type II superconductivity are summarised. Microstructure and superconducting properties of deformed niobium-tantalum, niobium-titanium, and niobium-zirconium alloys were studied and compared with those of pure niobium. All these alloys are type II superconductors, which above a certain critical field, H ic1, enter the mixed state, consisting of Abrikosov current vortices in a superconducting matrix. Dislocations introduced by deformation interact with current vortices to cause irreversible superconducting behaviour and contribute to a high current-carrying capacity. It is concluded from the results presented here that a strong vortex dislocation interaction is obtained only when a non-uniform dislocation distribution is present, and that a uniform distribution produces only weak pinning. Flux-pinning by dislocation tangles is treated as a special case of pinning by normal particles resulting from a variation in κ, the Ginzburg-Landau parameter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00549930
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