Abstract: A method of triggering a security alert using a tracking device, including detecting motion using a motion sensor of the tracking device, determining that the detected motion meets a motion threshold, detecting one or more wireless access points in proximity to the tracking device, determining that the one or more wireless access points do not correspond to a recognized wireless access point, and in accordance with the determination that the one or more detected wireless access points do not correspond to a recognized wireless access point, triggering a security alert.

Abstract: Gel coating of thermoplastic particles, such as polyimide particles, with a polyketone or polyvinyl alcohol gel, and applying the gel coated particles to reinforcement, e.g. carbon, fibers to form a pre-preg. Such gel coated thermoplastic particles can be mixed with a thermosetting resin to form a pre-preg, which can be cured at elevated temperatures to form a composite having damage tolerance characteristics. The gel coating is applied to the thermoplastic particles by contacting such particles with a polymerizable material such as acetone in a weakly acidic solution to cause the acetone to undergo tautomerism, and in the presence of a polymerization promoter or catalyst, preferably certain anionic surfactants such as sulfated ammonium salts, to convert the tautomer to polyacetone gel of low molecular weight, which coats or encapsulates the thermoplastic particles.