Aims To evaluate the 1-year efficacy of two new myopia control spectacle lenses with lenslets of different asphericity. Methods One hundred seventy schoolchildren aged 8–13 years with myopia of −0.75 ...

Abstract: This paper proposes a fractional observer-based sliding-mode control for a generalized nα -differentiator with the aim of achieving closed-loop asymptotic stability. The proposed methodology ...

An estimated 90% of Port-au-Prince is under the control of criminal groups who are expanding attacks into previously peaceful areas, a U.N. official said.