The paper presents an analytical solution for the centric viscoelastic impact of two smooth balls. contact period has phases, compression and restitution, delimited by moment corresponding to maximum deformation. motion system is described a nonlinear Hunt–Crossley equation that, when compared linear model, advantage hysteresis loop closing in origin. There only single available obtained from t...

To analyze the optimal control of Typhoid fever virus a mathematical modeling was developed by Getachew Teshome Tilahun. We have approached Homotopy Perturbation Method to solve linear differential equation. An analytical solution Susceptible People(S), Infected People (I), Carrier (C), Recovered (R), and Bacteria ( is obtained compared with simulation results. A significant agreement produced ...