The Old Lead Belt of Missouri was a major lead-producing region for over a century. Several large tailings piles and other industrial wastes remain behind, though mining operations in the region ceased in 1972. Samples of stream sediments and fish were collected from established sites on the Big River and Flat River Creek over a 3-year period from 1998 to 2000 to evaluate ongoing remediation ef...

Faecal coliform (FC) concentration was monitored weekly in the Tangipahoa River over an eight year period. Available USGS discharge and precipitation data were used to construct a nonparametric multiplicative regression (NPMR) model for both forecasting and backcasting of FC density. NPMR backcasting and forecasting of FC allowed for estimation of concentration for any flow regime. During this ...

This study investigated the effectiveness of an innovative remediation program, based on promoting self-efficacy, a construct of self-regulation theory, which was developed to provide sustainable improvements in academic and clinical performance of underperforming medical students. Eighteen medical (eight 4 and ten 5 year) students participated in the remediation program. Interventions were mul...

BACKGROUND In situ sorbent amendment for persistent organic pollutant sequestration in sediment has over the past 15 years steadily progressed from bench-scale trials to full-scale remediation applications. Hindering a wider technology uptake are, however, concerns about ecotoxic side-effects of the most commonly used sorbent, activated carbon, on sensitive, sediment dwelling organisms like Lum...

Brian B. Looney A US EPA directive and related technical protocol outline the information needed to determine if monitored natural attenuation (MNA) for chlorinated solvents is a suitable remedy for a site. For some sites, conditions such as complex hydrology or perturbation of the contaminant plume caused by an existing remediation technology (e.g., pump-and-treat) make evaluation of MNA using...

The present study evaluates the effectiveness of Just-In-Time Hints (JITs) by testing two competing hypotheses about learning from errors. The tutor-remediation hypothesis predicts that students learn best when a tutoring system immediately explains why an entry is incorrect. The self-remediation hypothesis predicts that learning is maximized when learners attempt to correct their own errors. T...

Student performance remediation is an ongoing issue in higher education due to the need for student retention. However, remediation is costly. For example, it is estimated the total annual cost of remedial courses across all types of higher education in 1998 was between one and two billion dollars. In the current financial environment, these additional costs will likely come under increased scr...

This study summarizes the main results obtained by the research group from the Instituto de Recursos Naturales y Agrobiología de Sevilla during ten years of study in the mine spill affected area of the Guadiamar river (SW Spain). This work is focussed on 1) trace element changes in soil (total and available concentrations) and plants (native and reforested), and 2) evaluation of the effectivene...