in a control structures, it is often preferred to minimize the gate width while utilizing the canal width in full for a stilling basin. therefore, to reach this, a gradually diverging stilling basin may be used. in this study, the effect of broad-crested sill on the expanding hydraulic jump in a rectangular channel was investigated. a total number of 79 tests were carried out for the range of i...

This paper presents the results of experimental work carried out to evaluate the distribution of cold and hot exhaust gas recirculation between cylinders in a DI diesel engine. The experiments have been conducted on a 3.99 liters turbocharged DI diesel engine under full load condition at 1900rpm in order to distinguish and quantify some effects of hot and cooled EGR with various rates on the EG...

THE UNITED STATES IS THE WORLD'S LEADING PRODUCER OF SOY. HOWEVER, MANY U.S. FARMERS are shining from soy to corn (maize) in order to qualify for generous government subsidies intended to promote biofliel production (7); since 2006, U.S. corn production has risen 19% while soy production has fallen by 15% (2). This in turn is helping to drive a major increase in global soy prices (5), which hav...

We report the existence of two simple perfect square-cylinders of order 20 shown in Figs. 1 and 2. Dissected cylinders are associated with graphs which we call cyl-nets. A cyl-net is obtained from a dissected cylinder in the following way. The two rims of the cylinder are associated with two vertices which are called “source” and “sink,” respectively. Each horizontal line is associated with a v...

High efficiency particulate air filter (HEPA) vacuums, which collect particles > 0.3 micro m, and trisodium phosphate (TSP), a detergent claimed to selectively remove lead, have been included in the HUD Guidelines for the Evaluation and Control of Lead Based Paint Hazards in Housing without systematic validation of their effectiveness. At the time the study was initiated, both HEPA vacuums and ...

Abstract A numerical study of a two-dimensional laminar flow and heat transfer characteristics in horizontal channel containing two in-line obstacles different shapes, namely an upstream triangular cylinder downstream square cylinder, was carried out. It is based on coupling between the Lattice Boltzmann Method (LBM) Finite Difference (FDM). The airflow (Pr = 0.71) assumed to be incompressible....

Animal fliers frequently move through a variety of perturbed flows during their daily aerial routines. However, the extent to which these perturbations influence flight control and energetic expenditure is essentially unknown. Here, we evaluate the kinematic and metabolic consequences of flight within variably sized vortex shedding flows using five Anna's hummingbirds feeding from an artificial...

The role canyons play in abyssal mixing is discussed, with a focus on the issue of low-frequency flow over sills and associated overturning instability as opposed to tidally generated mixing. Flow through several deep canyons on the mid-ocean ridge is reviewed and some global consequences are discussed.