By means of an asymptotic method the buckling under uniform external pressure thin cylindrical shell supported by identical annular plates is analyzed. Boundary conditions on internal parallel joined to a plate are obtained. At edges free support introduced. We seek approximate solutions eigenvalue problem as sum slowly varying functions and edge effect integrals. On parallel, where joint with ...

I consider the quantum electromagnetic field in a coaxial cylindrical waveguide, such that the outer cylindrical surface has a time-dependent radius. The field propagates parallel to the axis, inside the annular region between the two cylindrical surfaces. When the mechanical frequency and the thickness of the annular region are small enough, only Transverse Electromagnetic (TEM) photons may be...

The present study adds to the knowledge of free vibration antisymmetric angle-ply annular circular plates with variable thickness for simply supported boundary conditions. differential equations in terms displacement and rotational functions are approximated using cubic spline approximation. A generalized eigenvalue problem is obtained solved numerically an eigenfrequency parameter associated e...

Our aim is to transpose the polarization control by mechanical stress, usually applied to single-mode fibers, to the (TM(01), TE(01), HE(21)(ev), HE(21)(od)) annular mode family. Nevertheless, the quasi-degeneracy of these four modes makes the situation more complex than with the fundamental mode HE(11). We propose a simple device based on periodic perturbation and mode coupling to produce the ...

rabbitfish is economically valuable teleost species which lives in shallow coastalwaters. two species of rabbit fish have been recognized in southern sea of iran (persiangulf) as namely siganus sutor and siganus javus. in the current study, in order toinvestigate the histology of the annular ligament of the s. javus’ eye, the prepared sectionsof the eyes of twelve healthy specimens were studied...

The behaviour of a viscous drop squeezed between two horizontal planes (a Hele-Shaw cell) is treated by both theory and experiment. When the squeezing force $F$ constant surface tension neglected, predicts ultimate growth radius $a\sim t^{1/8}$ with time $t$ . This first reviewed found to be in excellent agreement Surface at boundary reduces interior pressure, this effect included analysis, alt...