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Sökning: WFRF:(Lisak Mietek 1947 ) > Lisak Mietek 1947 > Tidskriftsartikel

  • Resultat 1-10 av 83
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  • Anderson, D., et al. (författare)
  • The optimal journey from A to B
  • 2008
  • Ingår i: American Journal of Physics. - American Association of Physics Teachers. - 0002-9505. ; 76:9, s. 863-866
  • Tidskriftsartikel (refereegranskat)abstract
    • How fast can you comfortably travel between two points A and B? This question is formulated as a minimization problem of a functional where the discomfort is quantified in terms of the integral of the square of the acceleration between A and B. The problem is solved in terms of the corresponding Euler-Lagrange equation and approximately using a direct variational approach based on trial functions and Ritz optimization. The main purpose of the analysis is to introduce undergraduate students to variational calculus in an interesting and pedagogical way.
  • Buyanova, M., et al. (författare)
  • Influence of secondary emission yield on the saturation properties of multipactor discharges between two parallel metal plates
  • 2010
  • Ingår i: Physics of Plasmas. - 1070-664X. ; 17:4
  • Tidskriftsartikel (refereegranskat)abstract
    • A detailed numerical simulation analysis is made of the saturation stage of multipactor discharges between two infinite parallel metal plates in vacuum exposed to a rf voltage. The main physical effect causing saturation of the multipactor discharge is increased space charge, as the electron density becomes large. It is found that the properties of the saturation stage depend crucially on the value of the secondary emission yield of the metal surfaces. Below a certain threshold value, the discharge has a two-sided character, but at this threshold the discharge makes an abrupt transition into two decoupled single-sided multipactor discharges containing significantly increased electron densities. The result of the numerical simulations gives a good picture of the saturation properties of the multipactor discharge and is also supplemented by an approximate analytical investigation that highlights and explains the characteristic properties of the observed saturation behavior.
  • Cattani, F., et al. (författare)
  • Co-propagating Bose-Einstein condensates and electromagnetic radiation: Emission of mutually localized structures
  • 2011
  • Ingår i: Physical Review A. Atomic, Molecular, and Optical Physics. - 1050-2947. ; 83:1
  • Tidskriftsartikel (refereegranskat)abstract
    • We have studied the details of the formation of mutually guided and localized structures of co-propagating coherent electromagnetic radiation and a Bose-Einstein condensate (BEC). In the limit of zero temperature and large detuning, we have used a semiclassical model based on Maxwell equations coupled to the Schrodinger equation which includes the back action of the atoms on the radiation. Following numerically the two systems, we have found that a variety of effects can be displayed depending on the initial conditions: The formation of single-hump mutually guided structures of atoms and radiation seems to be only one of the possible outcomes of the interaction. Other effects we have observed via numerical simulations are, for instance, the creation of atom-laser solitarylike structures which are then symmetrically ejected from the initial central peak or similar symmetrical structures trapped in a bound state and thus oscillating about the central point in a way somehow reminiscent of purely nonlinear optics effect.
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  • Resultat 1-10 av 83

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