Abstract: A system and method to identify and track one or more targets of interest. The system may include a plurality of collection systems to capture information related to visual identifiers and/or electronic signatures associated with targets in selected locations. The system may further include an intelligence system to determine a target of interest based on the information related to visual identifiers and/or electronic signatures and to track the target of interest.

Abstract: A system and method to identify and track one or more targets of interest. The system may include a plurality of collection systems to capture information related to visual identifiers and/or electronic signatures associated with targets in selected locations. The system may further include an intelligence system to determine a target of interest based on the information related to visual identifiers and/or electronic signatures and to track the target of interest.

Abstract: A copolymeric hydrogel for contact lenses with physiological saline uptake 65-85% is formed from an N-vinyl lactam e.g. N-vinyl-2-pyrrolidone and up to 15% of a hydrophobic comonomer of formula ##STR1## where R.sup.1 is H or C.sub.1 -C.sub.4 alkyl (preferably methyl) X is --O-- or --NH-- and R.sup.2 is aryl, C.sub.1 -C.sub.6 alkyl substituted by aryl or aryloxy, or C.sub.1 -C.sub.6 alkoxy substituted by aryl or aryloxy. Preferably the aryl or aryloxy group contain one or two six-membered carbocyclic aromatic rings; they may be C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy, or halogen, substituted. Crosslinking agents used preferably have their two functional groups differing in reactivity e.g. allyl, or 3-allyloxy-2-hydroxypropyl, methacrylates.

Abstract: Water-swellable lightly cross-linked copolymers, specifically terpolymers, between 3-methoxy-2-hydroxy-propyl methacrylate (G-MEMA), at least one N-vinyl lactam and at least one copolymerizable monomer to increase strength and stiffness, have utility as contact lenses. Preferred examples contain methyl methacrylate (MMA) and vinylpyrrolidone (VP) as comonomers, and up to 5% e.g. 2% of a cross-linking agent, preferably with non-equivalent functional groups such as allyl methacrylate. Preferably the water content is up to 65% based on total gel, e.g. 50-60% by weight; the VP:MMA ratio is from 50:50 to 70:30 and from 10-75% by weight G-MEMA units are present.