Sound reflections from most finite surfaces, such as overhead reflector panels, include a component known as edge diffraction. Edge diffraction is the scattered energy required to maintain a continuous sound field despite the discontinuity in acoustical impedance presented by the scatterer. Edge diffraction can interfere with primary scattered energy to produce comb filtering at receiver locati...

A classical Fourier amplitude theory of combined Doppler and pressure broadening in the impact approximation is developed which treats phase changes due to translation and collision on an equal basis. Radiator motion is accounted for properly by includingspeed dependence in the collision frequency and velocity dependence in the distribution function for phase shifts and final velocities as the ...

The active noise control of sinusoidal sound in free space has received considerable attention in the last few years. In a number of practical situations, the sound radiated in free space by extended sources needs to be globally reduced. This is the case of electrical power transformers, for example [1]. Nelson and Elliott have demonstrated that sound power attenuation can be achieved by active...

The diagnostics of the noise acoustical sources from near-field data is considered. The algorithms allowing the determination of the equivalent elementary source distribution along a radiator and the far-field reconstruction from near-field measurements are presented. Some components of the total reconstruction error are analyzed.

Abstract This paper aims to deeply understand the influence of different columnar rib spacing on comprehensive thermal hydraulic performance miniature radiator, and further explore flow heat density Taking 10 radiator models as research objects, single-phase transfer process square was studied. The experimental results show that for kinds radiators, relationship between maximum temperature diff...

We have measured angular distributions for single photoproduced r[' mesons at 4.0, 5.0, and 7.5 GeV incident photons energies and at lab angles from XL0 to 66' with the S.L.A .C. 8 GeV spectrometer. Combined with previous S.L.A.C. results, this gives complete angular coverages for this range of energies. The data show the usual "t" 2nd "u" diffraction peeks and a flcentrsl plateau" region dropp...

This study aims to improve the performance of vehicle's cooling system called radiator, which is part increasing energy efficiency. Research has been done investigate convective heat transfer hybrid nanofluid, using CuO and TiO2 nanoparticles water-ethylene glycol (RC) as base fluids on a radiator. The mass concentration varied from 0.25 %, 0.30 0.35 %. For preparation nanofluid through two-ste...