Nearly 40 years ago, Neuman (1968) developed an analytical solution for drawdown in a system of three aquifers separated by two aquitards when one of the aquifers is pumped at a constant rate. Whereas the simpler case of two aquifers separated by one aquitard has been presented by Neuman and Witherspoon (1969a), the full five-layer solution has not been previously evaluated. We do so here using...

Designs of heat exchangers have mostly been disconnected to the performance of thermoelectric generator (TEG) systems. The development work, mostly focused on thermoelectric materials, required a significant amount of engineering parametric analysis. In this work, a micro plate-fin heat exchanger applied to a TEG is investigated and optimized to maximize the output power and the cost performanc...

It is well known that the dynamic position of the rod pumping aid in the diagnosis of onshore oil wells and can be used to control the pumping unit. Even today the acquisition of the position of the polished rod is made using physical transducers of position. However, this paper shows that the dynamic position of the polished rod can be inferred from torque current (which is given by sensorless...