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Träfflista för sökning "swepub ;srt2:(1990-1994);srt2:(1990);hsvcat:2"

Sökning: swepub > (1990-1994) > (1990) > Teknik

  • Resultat 1-10 av 837
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  • Ottersten, Björn, 1961-, et al. (författare)
  • Asymptotic Robustness of Sensor Arrary Processing Methods
  • 1990
  • Ingår i: Proceedings of the 1990 International Conference on Acoustics, Speech and Signal Processing. - Linköping : IEEE Signal Processing Society. ; , s. 2635-2638
  • Konferensbidrag (refereegranskat)abstract
    • Methods for estimating the parameters of narrowband signals arriving at an array of sensors are analyzed. Asymptotic results for several estimators have recently appeared in the literature. With few exceptions, the previous analysis requires the incident signal waveforms to be Gaussian random variables. These results are shown to be valid under much more general conditions, i.e. the actual distribution of the signal waveforms does not affect the asymptotic properties of the parameter.
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  • Lindgren, Lars-Erik, et al. (författare)
  • Explicit versus implicit finite element formulation in simulation of rolling
  • 1990
  • Ingår i: Journal of Materials Processing Technology. - 0924-0136 .- 1873-4774. ; 24, s. 85-94
  • Tidskriftsartikel (refereegranskat)abstract
    • The computational efficiency of the explicity finite element code DYNA2D and the implicit code NIKE2D are compared in the case of simulation of rolling. It is found that the explicit code is preferable. The advantages of the explicit formulation will be even more pronounced in three-dimensional simulations
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7.
  • Niska, John, et al. (författare)
  • Formation of the 124 phase superconductor (YBa2Cu4O8) by retaining oxygen in a reaction HIP sintering process
  • 1990
  • Ingår i: Journal of materials science letters. - 0261-8028 .- 1573-4811. ; 9:7, s. 770-771
  • Tidskriftsartikel (refereegranskat)abstract
    • The ceramic superconductor YBa2Cu4O8 has been produced by high temperature sintering of a mixture of CuO and YBa2Cu3O7 in a glass capsule under high hydrostatic argon pressure. The resulting highly dense material is investigated by X-ray diffraction, optical and electron microscopy, resistance measurements and hardness measurements, and shown to be a homogeneous High transition temperature superconductor.
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  • Axsäter, Sven, et al. (författare)
  • Evaluation of a new type of sequential lot sizing techniques
  • 1990
  • Ingår i: Engineering Costs and Production Economics. - 0167-188X .- 1878-4011. ; 19:1-3, s. 281-286
  • Tidskriftsartikel (refereegranskat)abstract
    • The classical dynamic lot size problem without backlogging is usually solved with the aid of various heuristics. Most heuristics are sequential, i.e. the demand is considered period for period, and a decision whether to include the demand in a certain period in the preceding batch is taken without regarding the future demand. Recently, it has been shown how to design a sequential lot sizing rule that will optimize the average performance, provided that a typical demand looks like a sequence of independent and identically distributed random numbers. The purpose of this paper is to evaluate if and how this methodology can be implemented in practice. The new lot sizing techniques are evaluated in a simulation study for different types of demand.
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9.
  • Gudmundson, Peter (författare)
  • Anisotropic microcrack nucleation in brittle materials
  • 1990
  • Ingår i: Journal of the mechanics and physics of solids. - 0022-5096 .- 1873-4782. ; 38:4, s. 531-551
  • Tidskriftsartikel (refereegranskat)abstract
    • A constitutive model for anisotropic microcracking in brittle materials is developed. The model is based on a stress controlled microcrack nucleation criterion, which can vary in a random way between different microcracks. The effects of microcrack closure and a random distribution of residual stresses are included in the analysis. The resultant inelastic strains are determined using a standard homogenization technique Numerical results are presented for three simple loading cases : pure tension, biaxial tension and triaxial tension. Crack tip shielding resulting from microcrack nucleation is also analysed, and numerical results of are presented for two different microcrack nucleation criteria.
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