This paper presents, formalises and classifies working time accounts (WTAs), a means of achieving flexible production capacity through the flexible organisation of working time. We propose linear programming models to plan working time, using WTA, at companies in the service industry. A computational experiment shows that the models can be solved for any planning problems of reasonable size.

OBJECTIVE To report the prevalence of weapons involved in the victimization of youth with particular emphasis on weapons with a "high lethality risk" and how such exposure fits into the broader victimization and life experiences of children and adolescents. METHODS Data were collected as part of the Second National Survey of Children's Exposure to Violence, a nationally representative telepho...

Sulfur Mustard (SM) is a chemical warfare agent which was widely used in the World War I and more recently during Gulf war in the early 1980s'. SM is a strong alkylating agent with known mutagenic and carcinogenic effects but only few studies have been published on its teratogenicity. Since SM has been widely used as a chemical weapon by the Iraqi regime against the Iranian soldiers as well as ...