An analytical method is being developed to determine the signature of an acoustic emission waveform from a growing crack and the results of this analysis are compared to experimentally obtained values. Within the assumptions of linear elastic fracture mechanics, a two dimensional model is developed to examine a semi-infinite crack that, after propagating with a constant velocity, suddenly stops...

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 ...

This paper deals with modeling and analysis of complex mechanical systems that deteriorate age. As age, the questions on their availability reliability start to surface. The system is believed suffer from internal stochastic degradation mechanism described as a gradual continuous process performance deterioration. Therefore, it becomes difficult for maintenance engineer model such system. Semi-...