The paper provides a detailed analysis of the current state problem. A mathematical model is presented to determine dynamic behavior earth dams, considering viscoelastic properties soil, using hereditary Boltzmann-Volterra theory with A.R. Rzhanitsyn kernel under periodic kinematic impacts. To solve problems considered, finite element method and complex arithmetics were used reduce integrodiffe...

In order to study the tribological properties of different hydraulic oils under motion modes, four-ball tester and block-on-ring were used optimize test parameters evaluate performance commercial oils. The results showed that optimized methods form point line modes can better extreme pressure anti-wear oi. There was a negatively correlation between performance; this method provide basis for rea...