abstract stepped spillways are of most important hydraulic constructions to dissipation energy of water flow. these constructions are used in opening channel to transfer water from upper level to lower level. because of considerable effect of steps on flow dissipation energy and also the resulted developments in construction of roller competed concrete rcc, the mentioned constructions have draw...

We evaluated the effect of emptying techniques a pontoon trap on mortality Atlantic salmon their spawning migration along Finnish coast northern Baltic Sea by tagging and releasing fish from commercial nets. Two methods currently used, traditional chute lifting bag, were compared. The bag has been developed primarily for minimising injuries during emptying. A custom-built Bayesian system model ...

Introduction: Facial fractures epidemiology varies with geographic region. Patients and methods: This study reports the frequency, demographic characteristics and aetiologies of facial fractures in a 5-year retrospective survey, in Burkina Faso. Results: In 349 patients, the fracture involved the mandible (44.5%), the zygomatic complex (38.9%), the maxilla (13.8%) or the naso-fronto-orbito-ethm...

In s ix 8to 1 1-year-old plantat ions of longleaf pine (Pinus palus tr i s Mill.) near Aiken, S.C., responses of understory vegetation, light, and soil watcr availability and litterfall were studied in relation to pine thinning (May 1994), herbicida1 treatment of nonpine woody vegetat ion (1995-1996), or the combined treatments (treatment responses described below are in absolute units) . Treat...