OBJECTIVES We sought to examine the associations between participation in a worksite fitness center and worker productivity. METHODS A modified Work Limitations Questionnaire (WLQ) and employees' short-term disability claims were used as productivity measures with multivariate logistic regression models to control for health risk, age, gender, and work location. RESULTS Nonparticipants in a...

While quasar outflows may be quasi-ubiquitous, there are significant differences on a source-bysource basis. These differences can be organized along the 4D Eigenvector 1 sequence: at least at low z, with only Population A sources radiating at relatively high Eddington ratio and showing prominent high-velocity outflows in Civ λ1549 line profiles. We discuss in this paper VLT-FORS observations o...

This paper analyzes and categorizes limitations and weaknesses of current Web-based educational technology, suggests the steps to overcome them, and presents a framework for developing next-generation Web-based educational systems. It suggests developing Web-based educational applications with more theoryand content-oriented intelligence, more semantic interoperation between two or more educati...