Aim To determine if ‘Defocus Incorporated Multiple Segments’ (DIMS) spectacle lenses slow childhood myopia progression. Methods A 2-year double-masked randomised controlled trial was carried out in ...

Initially, the partially reflective surface (PRS) of the Fabry–Pérot cavity (FPC) antenna operating at the sub-6 GHz band is realized by using single-layered periodic grid patches while the opaque ...

The fresnel zone lens (FZL) in this research work is designed using high-density polyethylene (HDPE). HDPE is characterized for the 28 GHz frequency by making i ...