Cleanup of contaminated aquifers by pumping and injection is one of the commonly used approaches for the remediation of groundwater contamination. Contaminant transport travel time in groundwater can be calculated using a method called ‘particle-tracking’ based on advection. The travel time of the contaminants is a highly non-linear and nonconvex function of pumping/injection rates and well loc...

The general objective is the development of supercom-puting algorithms for the optimal feedback control of larger scale, continuous time, nonlinear, Markov stochas-tic dynamical systems. The numerical procedures are based on PDE methods such as the nite element or difference methods for stochastic dynamic programming, as well as other advanced numerical methods. The algorithms have been impleme...

Groundwater contamination due to leakage of gasoline is one of the several causes which affect the groundwater environment by polluting it. In the past few years, In-situ bioremediation has attracted researchers because of its ability to remediate the contaminant at its site with low cost of remediation. This paper proposed the use of a new hybrid algorithm to optimize a multi-objective functio...

Characterizing the subsurface is important for many hydrogeologic projects such as site remediation and groundwater resource exploration. Methods based on the analysis of conventional pumping tests have the notable disadvantage that at a certain distance, the signal is small relative to the noise due to the effects of recharge, pumping in neighboring wells, change in the level or adjacent strea...

Abstract Mud pumping in subgrade beds under ballastless tracks will deteriorate the dynamic performance of infrastructure railway lines, reduce smoothness and seriously affect comfort safety trains. Due to their good mechanical properties, two-component polyurethane materials can be used for grouting treat fouling problems caused by track mud pumping. To develop a formula suitable treatment pum...

The Acceleration of the Diffusion-Limited Pump-and-Treat Aquifer Remediation with Pulsed Pumping that Generates Deep Sweeps and Vortex Ejections in Dead-End Pores by David Murray Kahler Department of Civil and Environmental Engineering Duke University Date:_______________________ Approved: ___________________________ Zbigniew J. Kabala, Supervisor ___________________________ Claudia Gunsch ____...

Changes in contaminant fluxes resulting from aggressive remediation of dense nonaqueous phase liquid (DNAPL) source zone were investigated at two sites, one at Hill Air Force Base (AFB), Utah, and the other at Ft. Lewis Military Reservation, Washington. Passive Flux Meters (PFM) and a variation of the Integral Pumping Test (IPT) were used to measure fluxes in ten wells installed along a transec...

In a rapidly evolving field such as Cognitive Rehabilitation Therapy (CRT), it is important for practitioners to be fully acquainted with the history and efficacy of their discipline. This review traces the development of Cognitive Rehabilitation over the past century and describes the status of CRT today. The authors describe various methods of Cognitive Remediation that are in current use alo...