Using a finite-difference time-domain method, it has been shown that focal spots generated when tightly focusing linearly polarized Gaussian beam by Fresnel zone plate (FZP) and with an embedded optical vortex spiral (SZP) have different patterns of the intensity energy flux. The most significant differences are observed value topological charge (TC) is equal to three. flux annular distribution...

Purpose: To present the results of open reduction and angulating-distraction ulnar osteotomy in children with chronic radial head dislocation. Material and Methods: This is a retrospective review of 4 children (3 girls, one boy) with chronic radial head dislocation treated in our hospital between 2009 and 2012. The average age at the time of surgery was 6.6 (4.2 – 9.1 years).The interval betwee...

This paper presents design of an alternating-phase fed single-layer slotted waveguide array for a sector shaped beam in the Eplane radiation pattern. A sector beam pattern is very effective for radar applications for detecting obstacles in a certain angular range without mechanical or electronic scanning. The sector shaped beam with 13 degree beam width is synthesized by a cascade of T-junction...