In order to present a new and high performance structure of PEM fuel cell and study the influence of the flow direction and distribution on the rate of reactants diffusion, three novel models of vertical reactant flow injection into the anode and cathode reaction area field have been introduced. They consist of one inlet and two inlets and also a continuous channel. The governing equations on t...

Computer security is a topic of growing concern because, on the one hand, the power of computers continues to increase at exponential speed and all computers are virtually connected to each other and because, on the other hand, the lack of reliability of software systems may cause dramatic and unrecoverable damage to computer systems and hence to the newly emerging computerized society. Among t...

Fluid flow in the mold region of the continuous casting process is responsible for surface defects, slag entrainment, and other steel quality problems. Thus, it is very important to choose nozzle geometries and operating conditions that produce flow patterns within an operating window that avoids these problems. Operating conditions which control mold flow problems include the mold cross sectio...