Oxyethira Eaton, 1873 is one of the most diverse genera Hydroptilidae, comprising over 240 species distributed in all biogeographical regions. Here three new (Trichoglene) Neboiss, 1977 are described and illustrated from male specimens collected New Caledonia: O. hamus sp. nov., recognized by hook-shaped apex long inferior appendages lateral view posterior margin segment IX with a trilobed appe...

Beamforming methods for sound source localization are usually based on free-field Green’s functions to model the propagation between and microphones. This assumption is known be incorrect many industrial applications beamforming results can suffer from this inconsistency regarding both, main lobe width dynamic range. The aim of paper investigate whether use numerically calculated functions, whi...

Abstract In this work, we present the findings of experimental study conducted in a rectangular duct at sonic and supersonic Mach numbers using passive control form semi-circular ribs. Tests are number four numbers. The 1.5, 1.8, 2.2, 2.5. flow from nozzles is discharged into enlarged duct. ribs placed 28 mm (1D), 56 (2D), 84 (3D), 112 (4D) base to find effect mechanism on field pressure. 6, 8,...

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The numerical solution of the Helmholtz equation subject to nonlocal radiation boundary conditions is studied. The speciic problem is the propagation of hydroacoustic waves in a two-dimensional curvilinear duct. The problem is discretized with a second-order accurate nite-diierence method, resulting in a linear system of equations. To solve the system of equations, a preconditioned Krylov subsp...

The models that are based of fractional derivatives should be highlighted among promising new models to describe turbulent fluid flows. In the present work, a steadystate flow in a duct is considered under the condition that the turbulent diffusion is governed by a fractional power of the Laplace operator. To study numerically flows in rectangular channels, finite-difference approximations are ...

2014 We propose a theory to calculate the pressure gradient and the liquid fraction in two-phase gasliquid fully developed stratified flow in a cylindrical duct of arbitrary cross-section and slope and its application to near horizontal ducts. Its validity is limited to Reynolds numbers high enough to ensure turbulent flow in both phases. Droplet entrainment or bubble inclusion have not been ta...

A combined numerical and experimental study is conducted to test the heat transfer enhancement friction factor characteristics for a rectangular duct fitted with three cases of ribs turbulators: continuous ribs, intermittent-continuous-intermittent intermittent ribs. Experiments are within turbulent flow Reynolds numbers values varied from 10000 35000, pitch ratio equal 5 height 0.33. The carri...