Introduction: Learning  is usually measured by  its academic performance. Many factors affect the academic performance of students. Some of these factors contribute to improved performance and some learners function is weakened. Among the factors that negatively affect academic performance would be  academic burnout. The current study aimed to determine the relationship between s...

a semi-empirical mathematical model for predicting physical part of ignition delay period in the combustion of direct - injection diesel engines with swirl is developed . this model based on a single droplet evaporation model . the governing equations , namely , equations of droplet motion , heat and mass transfer were solved simultaneously using a rung-kutta step by step unmerical method . the...