We report on the current status of the technical design and results of tests of some components of a compact racetrack microtron (RTM) which is under construction at the Universitat Politècnica de Catalunya (UPC). The RTM end magnets are four-pole systems with the magnetic field created by a rare-earth permanent magnet material. As a source of electrons a 3D off-axis electron gun is used. These...

The very first requirement to effectively use a computational fluid dynamics model is to prepare a 3D physical geometric model of the problem. Analysis of the fuel spray process involves specification of chamber space like bore and stroke of an internal combustion engine. Fluent software needs geometric meshing which in the present case is carried out using commercially available Gambit softwar...

The combustion chamber's internal refractory in Imam Khomeini Oil Refinery Company (IKORC) was damaged several parts, requiring operating conditions and re-inspecting the design of chamber using CFD. Simplify 3D simulation, decrease number calculations, symmetry principle applied simulation. results, independent mesh network, were investigated via increasing nodes. one-stage, two-stage, multi-s...

Three-dimensional (3D) structural information on many length scales is of central importance in biological research. Excellent methods exist to obtain structures of molecules at atomic, organelles at electron microscopic, and tissue at light-microscopic resolution. A gap exists, however, when 3D tissue structure needs to be reconstructed over hundreds of micrometers with a resolution sufficient...

The paper presents results of determination of sound source localization based on signals measured by first-order ambisonic microphone. The experiment consisted in recording the test signals with the 3D microphone positioned in the axis of the turntable in the anechoic chamber. The spherical coordinates of the sound intensity vector were calculated and compared to actual values resulting from t...

According to the current prospect of allocating next generation wireless systems in the underutilized millimeter frequency bands, a thorough characterization of mm-wave propagation represents a pressing necessity. In this work, an “item level” characterization of radiowave propagation at 70 GHz is carried out. The scattering properties of several, different objects commonly present in indoor en...

This paper reports, for the first time, a microfluidic system that can reproduce the vascular anastomosis between a perfused vessel network in a 3D tissue chamber and an endothelial cell (EC)-lined microfluidic channel. By using a decoupling design of the microfluidic device, the physiological microenvironment including both the interstitial flow for vasculogenesis and shear stress for EC linin...

in this paper a new process is presented for improving efficiency of cyclone de-dusting systems. the cyclone is coupled with a specially designed cylindrical chamber which includes a rotating tube inside it with air impinging nuzzles, drilled on the peripheral surface of the tube. the nuzzles help in pushing and throwing the particles to the outer radius distances during downward flow of dust i...

AIMS Although the utility of two-dimensional (2D) speckle tracking echocardiography (STE) to quantify left ventricular (LV) volume has been demonstrated, this methodology is limited by foreshortened views, geometric modelling, and the assumption that speckles can be tracked from frame to frame, despite their out of plane motion. To circumvent these limitations, a three-dimensional (3D) speckle ...

The research aims to develop municipal solid waste (MSW) incinerators for higher thermal efficiency and minimal pollution from combustion. 3D CFD model is developed that consist of a combustion chamber cyclone. A incinerator with 250 kg/h capacity modeled. simulated the comparative behavior between finned smooth walls. results indicated finned-walled exhibited more turbulent flow air distributi...