An Acoustic Window is comprised of a horizontal sliding window at the inner layer, and side-hung window, which can be pushed to open, on one side outer fixed glazing other side. The serves as “baffle” for screening off noise passing through opened when it slid behind window. This baffle-type acoustic proved reduce up 8 dB(A) road traffic gaining popularity in residential developments Hong Kong,...

Windage power loss (WPL) is significant and cannot be neglected in a study on transmission efficiency reducing the energy consumption of high-speed gear. The influence mechanism baffle reduction WPL needs to further studied. Based computational fluid dynamics (CFD) technology, this paper puts stress analyzing axial radial baffles viscous pressure effects with groove structures WPL. numerical ca...

As an efficient energy consumption hydraulic structure applied in deep-buried tunnel drainage system, the rate and inflow capacity of baffle-drop shafts were been influenced seriously by shaft structural parameters. Based on a scale model test Realizable k–ε model, flow regimes, maximum discharge, outflow velocity, drop with different baffle angles spacings experimentally numerically investigat...

A baffled arc array (BAA) comprises a circular array of sensors surrounding a cylindrical metal baffle, and beamforming is carried out by processing sensors on an arc centred on beamsteer. It is widely used in sonar for passive underwater surveillance. An important factor that limits the performance of the array at high frequencies is the appearance of grating lobes in the beamformer response. ...

Designing and manufacturing the multiple jets simulator and experimental investigation of the multiple jets in crossflow at low velocity ratios have been studied Together with design and build a low-speed wind tunnel. A specific rake is used to determine the flow field pressure and changes in static pressure measured by pressure taps in the near field of the jets. There are generally three regi...

Designing and manufacturing the multiple jets simulator and experimental investigation of the multiple jets in crossflow at low velocity ratios have been studied Together with design and build a low-speed wind tunnel. A specific rake is used to determine the flow field pressure and changes in static pressure measured by pressure taps in the near field of the jets. There are generally three regi...

multinational corporations (mncs) are major actors in contemporary world. their negative and positive impacts on human life make clear the need for expanding their responsibilities. the aim of this article is to show how responsibilities of mncs evolve during recent 50-60 years. through two sections, the article examines vertical and horizontal expansion of mncs’ responsibilities and then recen...