Integrated EPANET-MSX process models of chlorine and its by-products in drinking water distribution systems.

EPANET and its commercial derivatives are the most widely-used software packages for modeling free chlorine and its by-products in drinking water distribution systems. Yet, they are not sufficiently accurate, general, or efficient for deriving optimal chlorine dosing strategies at different seasonal temperatures. To overcome EPANET's limitations, an integrated set of rigorously validated multispecies process models are proposed for application within the EPANET-MSX environment.

Cognitive screening for children and adolescents: general limits or ceiling effects?

Cognitive screening tools designed for children can also be used with adolescents. However, early studies suggest that scores can approach a maximum at about age 10 or 11 years. The initial hypothesis was this apparent ''ceiling effect'' is due to limits in the materials, where items can be insufficiently challenging for some adolescents.

Implications of biofilm-associated waterborne Cryptosporidium oocysts for the water industry.

Waterborne Cryptosporidium has been responsible for drinking water-associated disease outbreaks in a number of developed countries. As a result of the resistance of Cryptosporidium to chlorine, which is typically applied as a final barrier to protect the quality of distributed drinking water, current management practices are focused on source-water management and water treatment as ways of preventing Cryptosporidium from entering drinking-water supplies. In the event that treatment barriers fail, surprisingly little is known of the fate of oocysts once they enter a distribution system.

Cognitive screening for young children: development and diversity in learning contexts.

SYSTEMS is a screening tool of general cognitive functioning for school-aged children that entails cognitive manipulation and information skills. Our aim was to extend the test for 4- and 5-year-old children at preschool to estimate theoretical starting points in typical cognitive profiles, which are critical in the early years. Participants (N = 1164, girls/boys, 50%) were 4 to 11 years old (mean 7.