Over the past decades, vibrations of annular
sector plates have been investigated using various analytical or numerical methods, such as the energy method , spline element method [3, 4], finite element method , integral equation method , and so on .
solar eclipse happens when the Moon covers the Sun's centre, leaving the Sun's visible outer edges to form a 'ring of fire' or annulus around the Moon.
It is very rare that a solar eclipse is visible to a country and this December the public in Sri Lanka will have the chance to see a annular
eclipse where the moon will cover the Sun leaving a outer ring of light.
The same is true for a rare aRing of Firea annular
solar eclipse next Christmas.
solar eclipse on December 26 will be visible from the Middle East, north-eastern Africa, Asia (except north and eastern Russia), north and western Australia, Micronesia and the Solomon lslands.
There are four subtypes of pustular psoriasis: 1) generalized (or von Zumbusch) pustular psoriasis (GPP), 2) annular
(or circinate) pustular psoriasis (APP), 3) guttate (exanthematic) pustular psoriasis, and 4) localized pustular psoriasis (3, 4).
A rectangular pattern has been associated with malignancies.3 Annular
pattern has been reported in only three patients, all by Bansal et al.
, erythematous plaques or patches on the dorsal hands or feet are the most common clinical manifestation of GA, a range of presentations exist.
At present, annular
polishing technology is an efficient method to obtain SiC mirrors with high surface quality [3-6].
pancreas (AP) is a rare congenital anomaly in which the second part of the duodenum is surrounded by a ring of pancreatic tissue continuous with the head of the pancreas.
The perturbation of the bent structure is, respectively, introduced at two diagonal positions of an oblique 45 degrees of each annular
slot, so that the resonant modes of the two frequency bands are degenerately separated to form circularly polarized radiation.