Mining-induced ground movement is a complicated nonlinear process and regional geological hazard. Time series in Earth sciences are often characterized as self-affine, long-range persistent, where the power spectra exhibit power-law dependence on frequency. Whether there exists periodic signal fundamental frequency time significant analyzing ground-movement patterns. To evaluate whether law des...

Cloven hooves of ruminants adapt to diverse terrain, provide propulsive force and support the whole body during movement in natural environments. To reveal how the feet ensure terrain adaptability by choosing the proper configurations and terrain conditions, we model the feet of ruminants as an equivalent mechanism with flexion-extension and lateral movement decoupled. The upper part of the equ...

Abstract In multiple-seam mining, severe deformation of roadways and coal bursts caused by overlying pillars can occur in the lower seams. Overburden movement ground pressure behaviour when mining thick seam below strong roof upper four extracted seams were investigated Tongxin mine, China. The numerical model indicated that abutment stress is affected as suggested bubble cantilever beam models...

A pan-tilt control technique for the camera orientation of the airship is proposed. This technique is constructed by combining the airship states and the error of the image centre as a feedback. For the ground target coordinates testing system installed in airship, a two dimension pan-tilt is used to drive the camera tracking the ground target in order to catch the image of the measured target ...

Definition of Drift When liquids are forced under pressure through small orifices (like sprayer nozzles) they are sheared into small aerosols or particles having nearly a thousand fold range in spherical diameters. Owing to gravitational forces and the viscosity of air, the rate of fall to ground can be predicted by Stokes Law and is proportional to the radius of the particles. The rate of fall...