"Numerical evaluation of heat-conductivity for  He-Cd  laser"
      by  Iliev I.P., Sabotinov N.V. and Gotcheva-Ilieva S.G.

        Abstract
    A model of the thermo-exchange in a cross high-frequency  He-Cd laser
is considered. It consists with a mixed boundary-value problem for the
steady-state heat-conductivity equation on the circle. The problem is
solving by means of the finite difference method. There are investigated
the cases of natural and constrained convections for different criteria
of similarities. Various ways for intensification of the thermo-exchange
are discussed. There are given engeneering recommandations, numerical
results and graphics.

   Bibliography:  9 references