Recursos de colección

Biblioteca Digital do IPB (53.442 recursos)

A Biblioteca Digital do IPB, tem por objectivo divulgar e permitir o livre acesso à produção científica produzida pela comunidade académica, promovendo a integração, partilha e a visibilidade da informação científica e garantindo a preservação da memória intelectual do Instituto Politécnico de Bragança.

IC - Working Papers

Mostrando recursos 1 - 4 de 4

  1. Computing ODE symmetries as abnormal variational symmetries

    Gouveia, Paulo D.F.; Torres, Delfim F.M.
    Computer Application
    - 24-ene-2018

  2. Automatic computation of conservation laws in the calculus of variations and optimal control

    Gouveia, Paulo D.F.; Torres, Delfim F.M.
    Computer Application
    - 24-ene-2018

  3. A double parabola with retroreflection properties

    Gouveia, Paulo D.F.
    This Demonstration shows the reflective behavior of a two-dimensional shape formed by similar arcs of two parabolas. An interesting and unexpected reflective behavior arises when this shape takes a specific configuration, with two parabolas of unit focal length. In this particular configuration it is found that, except for the rays with absolute value of the entry angle less than 19.47º, a ray emerges from the cavity with a trajectory that is nearly opposite to its entry trajectory. This characterizes a cavity with retroreflective behavior. Even in the case of trajectories with entry angle below 19.47º, the exit direction does not...
    - 24-ene-2018

  4. Reflection of parallel rays by a two-dimensional body of nearly maximal resistance

    Gouveia, Paulo D.F.
    This Demonstration shows a class of nonconvex bodies that maximize resistance as they move forward while slowly rotating through a rarefied medium. This class of shapes yields a resistance very close to the theoretical maximum, improving all previous results found by the authors.
    - 24-ene-2018

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