A Helmholtz resonator with a curved cavity is studied for reducing jet-installation noise in configuration comprised by subsonic jet and nearby flat plate. The face-sheet are designed the Guess method impedance verified through an experiment simulation of tube. Both single double degree-of-freedom liners, latter perforated septum inside cavity, studied. good agreement obtained curves from desig...

The screening of Coulomb interaction controls many-body physics in carbon nanotubes, as it tunes the range and strength force that acts on charge carriers binds electron-hole pairs into excitons. In doped tubes, effective drives competition between Luttinger liquid Wigner crystal, whereas undoped narrow-gap tubes dictates Mott or excitonic nature correlated insulator observed at low temperature...

Gradient flows for energy functionals have been studied extensively in the past. Well known examples are the heat flow or the mean curvature flow. To make sense of the term gradient an inner product structure is assumed. One works on a Hilbert space, or on the tangent space to a manifold, for example. However, it is possible to do without an inner product. The domain of the energy functionals c...

Spatial and temporal variations of the hemodynamic features occur under pulsatile conditions in complex vessel geometry. Wall shear stress affected by the disturbed flow can result in endothelial cell dysfunction, which leads to atherogenesis and thrombosis. Therefore, detailed understanding of the hemodynamic characteristics in a curved stenosed channel is highly important when examining the p...

INTRODUCTION The human body was not designed to facilitate surgical repair. Thus, in order to minimize collateral damage to healthy tissue, many interventions require following complex curved paths through tissue and body lumens to reach surgical targets. The smallest existing instrument technologies utilizing this approach are comprised of catheters and endoscopes for passing through body lume...

434 July/August 2005, Vol. 76/No. 6 RADIOLOGIC TECHNOLOGY Acromial spurring, bursitis, impingement, rotator cuff strains, tendonitis and traumatic injuries to the shoulder are familiar reasons for shoulder pain. To assist in the diagnosis, plain-film radiography is indispensable for studying shoulder abnormalities. Similarly, radiographs help to demonstrate the relationship of the glenoid fossa...

The spectral properties of curved quantum wires with Dirichlet boundary condition were widely investigated (e.g. [1], [2], [3]). It was shown that any small curvature of the tube in dimensions 2 and 3 produces at least one positive eigenvalue below the essential spectrum threshold. The problem of the existence of such eigenvalues in the straight quantum waveguides with a combination of Dirichle...

objective the purpose of this study was to assess the frequency of complications of endotracheal intubation (eti) in neonates. methods the newborns that were admitted and needed urgent or semi-urgent intubation were enrolled in this study over a 1 year period. route for intubation in all cases were orotracheal. cases were not routinely sedated or paralyzed. the patients were clinically and radi...