Local scour around a cylindrical pier in a channel with an erodible bed or natural bed is a common problems in bridge or pile supported structure. The highly unsteady complex flow field around a circular pier produces scour hole mainly for the presence of vortices. The main mechanism that drives the formation and evolution of the scour hole around bridge pier is horse shoe vortex motion. In the...

Introduction In this contribution, we present a multi-channel T/R coil for use in a 9.4T animal scanner system. Each coil element comprises a composite right/left-handed (CRLH) metamaterial transmission line (MTL). Eight of these elements were arranged in a circular manner to constitute a multi channel coil. MTLs offer the feature of a homogenous current distribution along the line when they ar...

This contribution describes an implementation of near field coding higher order Ambisonics on an existing circular array of 48 loudspeakers. Static and moving sources can be reproduced with a variable Ambisonics order and variable number of loudspeakers. Informal listening tests were performed to evaluate the influence of Ambisonics order and loudspeaker number on the perception quality and loc...

The present work proposes towards flow pattern prediction in a liquidliquid microchannel flow through a circular channel. Mass transfer in a microchannel mainly depends on the flow regime inside the channel. The liquid-liquid two phase flow regime in a microchannel depends on the flow velocity and the junction characteristics. Hence, the prediction of patterns has a superior role for the charac...

The numerical modeling of field-assisted ion exchange in glass through a finite aperture is carried out. The effects of unequal ion mobilities and thermal diffusion are included we believe for the first time in the 2-D case. This allows for the modeling of optical channel waveguides with graded index profiles. It is demonstrated that annealing of backdiffused channel guides is far superior to b...

In this paper, the circular ring model is proposed to model the signal statistics of a wideband multiple-input multiple-output (MIMO) channel. Based on the proposed model, a new space-timefrequency cross-correlation function is derived for the MIMO channel, in a compact mathematical form. The cross-correlation function includes various parameters of interest such as the distance between the bas...

Steam reforming integrated with oxidation of methanol was considered with numerical simulation. The parallel micro-channels with circular cross sections were used. Because when the catalytic deposited inside the rectangular micro-channels, it fills up the edges. Hence, the approximation of a cylindrical channel is appropriate. Effect of this changing in cross section was considered and results ...

In recent decades, many dams have been built or are under construction. Due to the high demand for water and soil erosion, increasing the need for dam construction in different regions are quite tangible. In 1900 the number of large dams, did not exceed 50. But in the 1950s to 1986 the number of large dams (over 15 meters), more than 39,000 were counted. The 70s dams has been increasing develop...