This work verifies that the W foil could be successfully welded on Cu through conventional explosive welding, without any cracks. The microstructure was observed through scanning electron microscopy (SEM), optical microscopy and energy-dispersive X-ray spectrometry (EDS). The W/Cu interface exhibited a wavy morphology, and no intermetallic or transition layer was observed. The wavy interface fo...

An aerofoil leading-edge profile based on wavy (sinusoidal) protuberances/tubercles is investigated to understand the mechanisms by which they are able to reduce the noise produced through the interaction with turbulent mean flow. Numerical simulations are performed for non-lifting flat-plate aerofoils with straight and wavy leading edges (denoted by SLE and WLE, respectively) subjected to impi...

In this paper, we establish a water-to-air (W2A) visible light communication (VLC) link using green emitting diode (LED), and investigate the coverage characteristics of designed W2A-VLC under calm wavy water conditions. By transmitting high-frequency sinusoid signal, extract variation gain. Based on received signals an experimental system, obtain real gains at different receiver points analyze...

Inducing spanwise motions in the vicinity of solid boundaries alters energy, mass and/or momentum transfer. Under some conditions, these are such that drag is reduced transition to turbulence delayed. There several possibilities induce those motions, be it through active imposition a predefined velocity distribution at walls or by careful design wall shape, which corresponds passive control.In ...

A 59-year old man was admitted to the emergency department with chest pain. He denied experiencing fever, breathlessness or cough. He had undergone coronary artery bypass surgery 4 years previously. Computed tomography showed a heterogeneous mass with wavy, striped areas (Fig. 1). Thoracotomy showed a foreign body. It proved to be a surgical sponge. Figure 1: Axial (A) and coronal (B) chest com...

This paper presents a numerical model for simulating fully dispersive, nonlinear water waves in coastal areas. A finite difference method based on the Keller-Box scheme is used to solve the incompressible Euler equations with the free-surface boundary conditions. The sigma coordinate transformation maps the irregular physical domain with the wavy free surface and the uneven bottom to a rectangu...

In this paper we discuss the effect of chemical reaction and thermal radiation on unsteady free convective heat and mass transfer flow through a porous medium in a vertical wavy channel. The unsteadiness in the flow is due to the oscillatory flux in the flow region. The coupled equations governing the flow, heat and mass transfer have been solved by using a perturbation technique with the slope...

Abstract Effect of the pulsed soft X-ray fluxes (PSXF) on surface topography metals (Mg and Cu) has been investigated. Soft pulse irradiation (energy quanta 0.1-1.0 keV) were carried out a high-current MIG generator. The sample magnesium was located at distance 10 cm from source. Since to significantly exceeded size beam, it can be assumed that density radiation flow uniform. duration 100 ns, e...