Four liners are investigated experimentally via tests in the NASA Langley Grazing Flow Impedance Tube. These include an axially-segmented liner and three liners that use reordering of the chambers. Chamber reordering is shown to have a strong effect on the axial sound pressure level profiles, but a limited effect on the overall attenuation. It is also shown that bent chambers can be used to red...

A dosimetric procedure to assure the traceability to the air-kerma standard of the measurements performed in synchrotron radiation beams, was implemented at the “Istituto Nazionale di Metrologia delle Radiazioni Ionizzanti” of ENEA (INMRI-ENEA). To this purpose, absolute air-kerma measurements by the ENEA standard free-air chamber for low energy x-rays have been performed at the SYRMEP (SYnchro...

A production-scale ionized physical vapor deposition ~I-PVD! source has been developed to investigate the directional metalization of 200 mm diameter wafers by sputtering. The ionization of sputtered metal is accomplished by a 45 cm diameter inductively coupled plasma ~ICP!. Unlike previously reported I-PVD sources, however, the coil of the ICP is external to the plasma chamber. A plasma-immers...

BACKGROUND Ischemic mitral regurgitation (IMR) is associated with asymmetric changes in annular and ventricular geometry. Surgical repair with standard symmetric annuloplasty rings results in a high incidence of residual or recurrent mitral regurgitation (MR). The Carpentier-McCarthy-Adams (CMA) IMR ETlogix annuloplasty ring is the first remodeling ring specifically designed to treat asymmetric...

We read with great interest an article by Shokri et al. entitled "Effects of Wi-Fi (2.45 GH z) exposure on apoptosis, sperm parameters and testicular histomorphometry in rats: a time course study" that is published in the latest issue of the Cell Journal (Vol.17, 2015: 322-331). In this article, Shokri et al. have presented their findings obtained in an experiment on an animal model. These rese...

The evolution of an inertial fusion energy (IFE) chamber involves a repetition of short, intense depositions of energy (from target ignition) into a reaction chamber, followed by the turbulent relaxation of that energy through shock waves and thermal conduction to the vessel walls. We present an algorithm for 2D simulations of the fluid inside an IFE chamber between fueling repetitions. Our fin...

The chamber model method is still a powerful tool for the thermodynamic simulation of screw machines and widely used in industry science. When choosing adequate submodels compressible flows through machine clearances ports high accuracy can be reached with minimal computation resources. However, detailed modelling required when complex geometry twin-screw abstracted to time-dependent zero-dimen...

Chemical vapor deposition (CVD) is a process that solid formed on substrate by the chemical reaction in phase. Employing this technology, wide range of materials, including ceramic nanocomposite coatings, dielectrics, and single crystalline silicon can be coated variety substrates. Among factors influencing design CVD system are dimensions or geometry substrate, temperature, composition type pr...

In this study, the combined effect of piston bowl geometry and fuel injection pressures on combustion, performance emission characteristics compression ignition (CI) engine fueled with baseline Diesel (D100) microalgae-biodiesel (MA100) was studied. paper, comparison study for two different geometry, namely: hemispherical combustion chamber (HCC) toroidal re-entrant (TRCC), carried out various ...

Backgrounds from punchthrough particles originating from minimum bias events and inclusive QCD jets in the CMS barrel muon system has been simulated using a detailed GEANT description of the Technical Design Report geometry and shielding. Rates due to punchthrough in the entrance at each muon station as well as rates of hits, produced by these punchthrough particles, are given as a function of ...