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Träfflista för sökning "LAR1:cth srt2:(1990-1999)"

Sökning: LAR1:cth > (1990-1999)

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91.
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92.
  • Akhmediev, N., et al. (författare)
  • Cherenkov radiation emitted by solitons in optical fibers
  • 1995
  • Ingår i: Physical Review A - Atomic, Molecular, and Optical Physics. - 2469-9926 .- 2469-9934. ; 51:3, s. 2602-2607
  • Tidskriftsartikel (refereegranskat)abstract
    • We demonstrate a simple, fully analytic method of calculating the amount of radiation emitted by optical solitons perturbed by higher-order dispersion effects in fibers and find good agreement with numerical results. It is pointed out that this radiation mechanism is analogous to the well-known Cherenkov radiation processes in nonlinear optics. © 1995 The American Physical Society.
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93.
  • Akhmediev, N.N., et al. (författare)
  • Radiationless optical solitons with oscillating tails
  • 1994
  • Ingår i: Optics Communications. - : Elsevier BV. - 0030-4018. ; 110:5-6, s. 540-544
  • Tidskriftsartikel (refereegranskat)abstract
    • We investigate, analytically and numerically, stationary soliton-like pulse propagation in nonlinear optical fibres, taking into account the effects of fourth order dispersion. A new type of stationary stable soliton-like solution is found. A unique feature of this type of solution is their unusual asymptotic behaviour (oscillating tails). © 1994.
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94.
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95.
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96.
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97.
  • Alarco, José A, 1963 (författare)
  • Grain Boundary Structure of YBa2Cu3O7-δ High Tc Superconductors
  • 1994
  • Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • The microstructures of YBa2Cu3O7-.delta. (YBCO) high Tc superconducting materials have been studied using analytical electron microscopy. The effects of processing parameters on the interfacial microstructures have been investigated in both bulk materials and thin films. The observations have been interpreted in terms of the influence of interfacial microstructure on the superconducting transport properties (e.g. Tc and jc). Different methods to control the interfacial microstructure have been investigated. The intergranular microstructures strongly affect the superconducting properties. The structure of grain boundaries which have been introduced in a controlled manner has also been investigated and correlated to the electrical characteristics. In YBCO films grown on (001) single crystal yttria stabilized-ZrO2 (YSZ) substrates by pulsed laser deposition, a change in the growth process occurred at about 740 °C. Polycrystalline films consisting of c-axis oriented grains interconnected by low-angle and characteristic high-angle grain boundaries were formed at deposition temperatures higher than 740 °C. Films with a single orientation relationship between the film and the substrate were obtained at lower deposition temperatures. An intermediate, polycrystalline, BaZrO3 (BZO) layer formed from a reaction between the film and the substrate. The formation of grain boundaries in the films resulted in an increased microwave surface resistance and a decreased critical current density. In epitaxial YBCO films grown on [001]-tilt YSZ bicrystal substrates, the film boundaries were generally wavy despite a relatively straight morphology of the substrate boundaries. The waviness of the film boundaries was a result of the combined effects of island growth of YBCO on YSZ substrates and grooving at the substrate boundaries prior to the film deposition. In addition, the grooving introduced tilt components perpendicular to the c-axis to the film boundaries. The different geometries of the film boundary plane may have given rise to variations in the physical properties along the boundaries as observed from measurements of jc as a function of applied magnetic field. A qualitative analysis of the expected dilatational strain field in the vicinity of an array of dislocations provided a basis for the prediction of the critical current density (jc) across a low angle YBCO grain boundary (GB) as a function of its energy. The introduction of the GB energy allowed the extension of the analysis to high angle GBs using established models which predict the GB energy as a function of misorientation angle. The results were compared to published data for jc across [001]-tilt YBCO GBs for the full range of misorientations, showing a good fit.
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98.
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99.
  • Alatalo, Mikael C D, 1959 (författare)
  • Permanent Magnet Machines with Air Gap Windings and Integrated Teeth Windings
  • 1996
  • Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • The thesis deals with axial and radial flux permanent magnet machines with air gap windings and an integrated teeth winding. The aim is to develop a machine that produces a high torque per unit volume with as low losses as possible. The hypothesis is that an advanced three-phase winding, magnetized by a permanent magnet rotor should be better than other machine topologies. The finite element method is used to find favourable dimensions of the slotless winding, the integrated teeth winding and the permanent magnet rotor. Three machines were built and tested in order to verify calculations. It can be concluded that the analysis method shows good agreement with the calculated and the measured values of induced voltage and torque. The experiments showed that the slotless machine with NdFeB-magnets performs approximately the same as the slotted machine. A theoretical comparison of axial flux topology to radial flux topology showed that the torque production of the inner rotor radial flux machine is superior to that of the axial flux machine. An integrated teeth winding based on iron powder teeth glued to the winding was studied. The force density of a pole with integrated teeth is around three times the force density of a slotless pole. A direct driven wind power generator of 6.4 kW with integrated teeth can have the same power losses and magnet weight as a transversal flux machine. Compared to a standard induction machine the integrated teeth machine has approximately 2.5 times the power capacity of the induction machine with the same power losses and outer volume.
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100.
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