Combined analysis of high-resolution seismic images of the Alaska and Cascadia subduction zones reveals where metamorphic fl uids are released. Both images show the subducted oceanic crust as a dipping low-velocity layer with a clear termination depth. However, in Alaska the crust is thicker (15–20 km compared to 8 km) and terminates at greater depth (120 km compared to 40 km) than in Cascadia....

The purpose of the article is to establish the relationship between rigid body motion and the optic flow image and solve motion parameters from optic flow image points. A basic equation relating optic flow image points to rigid body motion which involves only the instantaneous rotation and translation velocities without depths is established. A linear algorithm is developed to determine the mod...

Falls are one of the major risks for seniors living alone at home. Computer vision systems, which do not require to wear sensors, offer a new and promising solution for fall detection. In this work, an occlusion robust method is presented based on two features: human centroid height relative to the ground and body velocity. Indeed, the first feature is an efficient solution to detect falls as t...

Two-and three-dimensional depth migration can be performed using one-and two-dimensional extrapolation digital lters, respectively. The depth extrapolation is done, one frequency at a time, by convolving the seismic waveeeld with a complex-valued, frequency-and velocity-dependent, digital lter. This process requires the design of a complete set of extrapolation lters, one lter for each possible...

In flotation process, the efficiency and selectivity depend on mineralogy, particle size distribution liberation, reagents added, mixing, coverage. However, kinetics of recovery is highly dependent cell hydrodynamic circuit configuration operational strategy. Controlling froth depth gas flow rate, measured as superficial velocity, a straightforward alternative related to in collection zones. th...

the conventional approach to seismic data analysis consists of two main steps: estimating seismic velocities, (the subsurface macro-model), and seismic imaging, (mapping of the reflected seismic energy to the reflector positions). the aim and the major challenge in the seismic data analysis is the construction of the best undistorted image. this challenge would be more problematic when geometri...

pore pressure is an important parameter, in exploration and production of hydrocarbon resources. lack of accurate knowledge about pore pressure, before drilling phase, leads to serious dangers in drilling process. accurate knowledge about distribution of pore pressure in a field, leads to reduce risks in drilling, improve well planning and mud weight calculations. during burial, normally pressu...