The authors develop new semiparametric tests for double unit roots under a weakly dependent error structure of Phillips for tests for a unit root. The tests are based on symmetric estimation of Sen and Dickey. Through Monte Carlo simulations, the new tests are compared with the tests of Haldrup...

This article describes the development of a numerical model that can consider variations in the concentration profile along the flow direction; not doing so can result in overestimation of the power generation capability. The developed model was used for studying the transport phenomena in a...