The purpose of this study was to compare the ACL injury rate between two different floor types - wooden floors (parquet, generally having lower friction) and artificial floors (generally having higher friction). ACL injuries have been recorded prospectively from the three top divisions for men and women in Norwegian team handball during seven seasons (1989-2000). A total of 174 ACL injuries hav...

In this paper, several alternative formulations for the multi-floor facility layout problem are presented. Elevators handle the material transport between different floors. Elevators are allowed to service either all floors or a contiguous set of floors. In this formulation, elevators can be located anywhere within the floors provided they do not overlap with departments. The departments and fl...

Different alley flooring systems have been found to influence claw health and locomotion among dairy cows in cubicle barns. The ability to keep the alley floors clean and dry is part of this. It is, however, challenging to keep the alleys clean at all time. Different cleaning regimes are used, and barns are equipped with a diversity of scrapers and alley surfaces. Scrapers are earlier found to ...

Safety floors (also known as compliant floors) may reduce the risk of fall-related injuries by attenuating impact force during falls, but are only practical if they do not negatively affect balance and mobility. In this study, we evaluated seven safety surfaces based on their ability to attenuate peak femoral neck force during simulated hip impacts, and their influence on center of pressure (CO...

Despite the importance of housing for people’s well-being, there is little evidence on the causal impact of housing and housing improvement programs on health and welfare. In this paper, we help to fill this gap by investigating the impact of a largescale effort by the Mexican Government to replace dirt floors with cement floors on child health and adult happiness. We find that replacing dirt f...

OBJECTIVES To compare the injury risk in pivoting indoor sports between two different surfaces: artificial floors and wooden floors. METHODS Female players (n = 331) from 26 top-level Finnish floorball teams were followed for one competitive season (6 months). All traumatic game related time-loss injuries were recorded. Injury incidences were calculated as the number of injuries per 1000 game...

A potential source of instability of many economic models is that agents have little incentive to stick with the equilibrium. We show experimentally that this may matter with price competition. The control variable is a price floor, which increases the cost of deviating from equilibrium. Theoretically the floor allows competitors to obtain higher profits, as low prices are excluded. However, be...