Abstract: Accuracy and reliability of the numerical simulations for nonlinear dynamical systems are investigated with fourthorder Runge–Kutta method and a newly developed piecewiseconstant (PT) method. Nonlinear dynamic systems ...

Abstract: From the perspective of vegetation density, this research studies the influence of vegetation on turbulence characteristics and Reynolds shear stress in partly vegetated channel via a series of experiments. Natural reed ...

Abstract: Torsional stick–slip vibrations easily occur when the drill bit encounters a hard or a hard-soft staggered formation during drilling process. Moreover, serious stick–slip vibrations of the drill string is the main factor ...