A model of the fibrous composite material friction and wear process is constructed taking into account the heating of the friction surface. The inhomogeneous temperature expansion of the composite components and the resulting fiber/matrix slippage near thefriction surface and the friction surface profile change is considered. The influence of temperature on the distribution of stresses in the fiber and matrix and on the roughness of the friction surface of the composite is determined.

The concept of a vertical barrier embedded in soil to protect from seismic waves of the Rayleigh type is discussed. Horizontal barriers are also analyzed. The principle idea for such a barrier is to reflect and scatter energy of an oncoming wave by the barrier, thus decreasing the amplitude of surface vibrations beyond the barrier. Numerical FE simulations of a plane model are presented and discussed.