A chute aerator is a device that entrains air into water and protects against cavitation erosion. The state of the jet cavity determines efficiency under different flow conditions. In case low Froude number velocity, backwater generated in cavity. severe cases, this blocks intake holes affects efficiency. With development construction conservancy projects, an increasing dams have been construct...

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...

Discrete element model is used to simulate the flow of liquid-granule mixtures in an inclined channel containing a linear contraction. All the relevant particle/particle and particle/fluid interactions are included in the numerical model. The presence of the contraction induces different steady morphologies of the solid phase or the mixture depending on whether closed or open channels are used....

recently, particular attention has been paid to the stepped spillways due to the increasing effect of energy dissipation and the reduction of cavitations risks with the development of roller compacted concrete (rcc) technique. flow regimes on the spillways divide into three groups, namely skimming, jet and transition flow. compared to the numerical methods, the majority of performed studies in ...

Abstract The study objective was to evaluate health, performance, and antimicrobial costs of heifers where targeted metaphylaxis guided by a commercial blood leukocyte analyzer compared traditional regimen. Using randomized complete block design, (n=1,271; initial body weight (BW) = 233.3±1.08 kg) were randomly allocated treatment pens (n=20; 10 blocks). Treatments were: 1) cattle administered ...