Community convergence across biogeographically distinct regions suggests the existence of key, repeated, evolutionary mechanisms relating community characteristics to the environment. However, convergence studies at the community level often involve only qualitative comparisons of the environment and may fail to identify which environmental variables drive community structure. We tested the hyp...

Abstract

the developing turbulent flow in an open channel is a complex three-dimensional flow influenced by the secondary currents and free surface effects and is, therefore, not amenable to analytical solution. this paper aims to study the impact of three key hydraulic parameters (relative roughness, the froude number and the reynolds number) on the establishment length using computational fluid dynami...

In terms of stability, the response static cars in floodwaters has been widely investigated. However, hydrodynamics a non-static vehicle exposed to such events are less explored. Herein study ponders assessment hydrodynamic forces experienced by attempting cross low-lying flooded street. With that regards, Perodua Viva was modeled (1:10) and tested Hydraulics Laboratory under partial submergenc...

there are different methods to reduce drag in high speed hulls. one of these methods is a change in the shape of the body by adding longitudinal side tunnels. in this paper it has been attempted to determine the influence of the tunnel height on hydrodynamic characteristics of the hull to achieving an optimum shape for the tunnel. to achieve this purpose, numerical simulation of the problem has...

efflux time measurements are carried out for gravity draining of a liquid from a large cylindrical tank (where the flow is essentially laminar) through single exit pipe in the absence and presence of cetyl pyridinium chloride (cpc) surfactant solutions. the variables considered are initial height of liquid in the tank, dia. of tank, length of the exit pipe and concentration of surfactant. the d...

Scholars at home and abroad have studied the concentrations of Se in coal relationship between sulfur assignment. However, little attention has been paid to study floating coal, especially distribution pattern densimetric fractions influencing factors. A total 138 samples were collected from 14 provinces cities China test we carried out comparison with forms 81 them. 10 selected for float-and-s...