San Diego, Calif.-based Elgar Electronics Corp. has appointed Francis (Fran) A. Paez as regional sales manager for the Central US, Mexico and Canada. Paez will lead the company's regional sales efforts for the Elgar, Sorensen and Power Ten brands of AC and DC programmable power supplies.. . .Nanoparticle developer Nanotechnologies Inc., of Austin, Texas, has made a development agreement for eyewear applications with ophthalmic lens maker Essilor.