Objective- Assessment of the lens anterior – posterior (AP) diameter as compared with the eye globe by ultrasonography in rabbit.   Design- Descriptive study.   Animals- 120 male and female rabbits, two months to four years old, and weighting between 300 to 1500gr.   Procedures- 2D ultrasonography of the eyes was performed and AP diameter of the eyes and lens were measured using Sonosite Tit...

Horn antennas can result in good impedance matching between the waveguide and free space due to the gradual increase in the aperture size. In this paper, a novel plasmonic sectoral horn nanoantenna based on using lens in the aperture is proposed. It is investigated that in addition to improvement of the directivity, the reflection coefficient is also reduced using the proper lens structure. The...

This article presents the exact closed-form solution for a new planar lens, hereinafter referred to as reflecting Luneburg lens (RLL). The proposed structure consists of two stacked parallel-plate waveguides circular shape. rays generated by point source located at periphery bottom waveguide propagate along curvilinear paths, whose trajectories result from variable refractive index profile with...

We describe gravitational lensing by a gravitational wave, in the regime in which multiple images of a light source are created. We adapt the vector formalism employed for ordinary gravitational lenses to the case of a non–stationary spacetime, and we derive an approximate condition for multiple imaging. It is shown that certain astrophysical sources of gravitational waves satisfy this conditio...

Damage to rat lenses in vitro caused by continuous (CW) and 24 kWpk microwave pulsed (PW) wave radiation fits a model correlating damage to specific absorption (SA), a product of the specific absorption rate (SAR) and exposure time. This model was extended to include new exposure conditions: higher peak powers of PW radiation at additional pulse durations. The overall model related damage to th...

purpose: to evaluate the prevalence of contat lens wear among highschool girls and their general knowledge about contact lenses and also to evaluate the specific knowledge of contact lens wearers about the lens. methods: in a cross-sectional study, 1664 students of 22 randomly selected girl highschools were enrolled. a questionaire including questions about wearing contact lens, age of first us...

Galaxy shear - cosmic microwave background (CMB) lensing convergence cross-correlations contain additional information on cosmology to auto-correlations. While being immune certain systematic effects, they are affected by the galaxy intrinsic alignments (IA). This may be responsible for reported low amplitude of $\times$ CMB cross-correlations, compared standard Planck $\Lambda$CDM (cosmologica...

The lens-less technique of microwave holography is expected to provide information three-dimensional structures plasma with a wide field view. From the complex amplitudes waves, which are observed on single planar array antennas, we will be able obtain an imaging object. With geometry back-scattering observation, feasibility examined numerical tool electromagnetic analysis dielectric objects. r...

The purpose of this investigation was to study and compare the electrophoretic patterns of optic lensproteins of different species of domestic animals at pre- and post-natal ages. Optic lenses were removed from the embryo or adult sheep, cattle, goat, camel and chicken at the slaughter-house then homogenized and subjected to sodium dodecylsulfate polyacrylamide gel electrophoresis (SDS-PAGE). I...