The Brio labyrinth, shown in Figure 1, is a popular game consisting of a board with holes and walls. In addition, the game has knobs which are used to tip the board in two planar directions for controlling the angle of the board. The aim of the game is to maneuver a steel ball along a marked path from a starting position to a final position on the board by tipping it so that the ball moves with...

Using Brownian dynamics simulations, we systematically study the effective interaction between two parallel hard walls in a 2D suspension of self-propelled (active) colloidal hard spheres, and we find that the effective force between two hard walls can be tuned from a long range repulsion into a long range attraction by changing the density of active particles. At relatively high densities, the...

abstract the prediction of active earth pressures is essential to the design of retaining walls in case of reinforced and unreinforced soils. in this study, a new analytical method is presented to determine the coefficient of earth pressure. the horizontal slice method is used to compute the active earth pressure behind a rigid retaining wall in consideration of the granular soils. to verify th...