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...

abstract: A prototype of Proximity Focussing Ring Imaging Cherenkov counter has been built and tested with several radiator materials using separately cosmic-ray particles and 12 C beam fragmentation products at several energies. Counter prototype and experimental setup are described, and the results of measurements reported and compared with simulation results. The performances are discussed i...

The cutaneous lesion of erythema ab Igne are characterized by a reticulate erythema, hyperpigmentation, fine scaling, epidermal atrophy and telangiectasias, and reticulated erythema. We report a case of erythema ab igne on the hands of a 8-year-old girl, induced by classic homemade radiator.

In 1946, John D. Kraus invented the helical-beam antenna (or axialmode helix).1 Commencing with Kraus’s correct hypothesis that travelling-wave structures then used in electromagnetic devices would make efficient antennas, the helix antenna has proven to be the radiator of choice for many radio astronomy and spacescience applications. The helical antenna has been carried to the Moon and Mars, a...

We report on test results of a novel ring imaging Cherenkov (RICH) detection system consisting of a 3 meter long gaseous C4F8O radiator, a focusing mirror, and a photon detector array based on Hamamatsu multi-anode photomultiplier tubes. This system was developed to identify charged particles in the momentum range from 3-70 GeV/c for the BTeV experiment. PACS numbers: 03.30+p, 07.85YK