81 The discovery and popularization of roentgenography at the beginning of the century enabled the visualization of heel spurs.1 Wachter and Sonnenschein2 in 1915 correlated four cases of painful heels with calcaneal spurs; after all four patients returned for surgery following conservative care, the authors concluded that surgical intervention was the best treatment. Heel spur syndrome or plan...

We develop an object-oriented simulation that models the airdrop mission of a U.S. transport aircraft, the C-1 7 Globemaster III. The simulation, written in MODSIM III, is based on three basic object types: an aircraft, a wake vortex, and a paratrooper. The aircraft object provides the required aerodynamic constants for simulating the wake vortices generated off each wingtip; the vortex object ...

Dense medium coal processing technology has been widely used in coal preparation industries in the world since it is the most accurate and efficient coal preparation process to obtain clean coal with a highest possible yield. Separation of coal and impurities using this technology is based on density differences. In literature, a number of mathematical models exist for dense medium cyclones. On...

A simulation model of the flow of Intermodal Terminal Units (ITUs) among inland intermodal terminals is presented. The intermodal terminals are inter-connected by rail corridors. Each terminal serves a user catchment area via a road network. The terminal is modelled as a set of platforms, which are served by a number of gantry cranes and front lifters. Given the schedule of train connections am...