Dynamical behavior of particles in a Paul trap has been investigated by solving the set of differential equations considering the effect of damping force. Positions of the trapped ions as a function of time, ion trajectories and the phase space curves in the first stability region have been obtained in the presence of the damping force. The region of stability for r and z components as well as ...

Background: The aim of this study was to identify mechanical risk factors of diabetic foot ulcers and presenting biomechanical solving to prevent diabetic foot ulcers. Methods: Related articles from validate electronic and indexed sources from 1990 to 2014 were studied. In summation, 140 articles from electronic databases and journals, Elsevier, Pumped, Up to date, Google scholar, Cochrane libr...

In this research, the effects of foulings on the outer surface of a marine vessel have been studied using the Computational Fluid Dynamics (CFD) methods. To this end, a proper turbulence model was considered and validated for the simulations. The simulation results for different fouling grades indicated that existing of a thin layer of slime could make 4.58 % increase in drag force; however, fo...