Abstract: A method includes receiving, from a plurality of magnetic field receivers including magnetic sensors, data characterizing samples obtained by the plurality of magnetic field receivers, the samples of a combination of a first magnetic field and a second magnetic field resulting from interaction of the first magnetic field and an object; determining, using the received data, a polarizability index of the object, the polarizability index characterizing a magnetic polarizability property of the object; classifying, using the determined polarizability index, the object as threat or non-threat; and providing the classification. Related apparatus, systems, techniques, and articles are also described.

Abstract: A system for providing advanced characterization of an optical fiber span is based upon the use of a pair of optical time domain reflectometers (OTDRs), located at opposing end terminations of the span being characterized. Each OTDR performs standard reflectometry measurements and transmits the resulting OTDR trace to monitoring equipment in a typical manner. The pair of OTDR traces is thereafter combined in a particular manner (“stitched together”) to create an OTDR trace of the entire fiber span (essentially doubling the operational range of prior art OTDR measurement capabilities). The transmit portion of one OTDR may be paired with the receive portion of the other OTDR, with time-of-light measurements (or signal loss measurements) used to determine optical path length and/or optical signal loss of the span. Using a multi-wavelength light source in the paired transmit/receive arrangement allows for a characterization of chromatic dispersion of the span.

Abstract: A mobile communication device includes at least one processor to display a user interface on a touch screen, the user interface comprising a button to receive a touch event, determine that the touch event is currently being received by the button and enter an alarm armed state, determine that the touch event ends and enter an alarm active state, and after a particular period of time in the alarm active state, trigger a communication to an emergency responder.

Abstract: A wearable safety alarm system includes one or more processors to receive identifying information and transmit the identifying information to an alarm response server from a mobile computing device, receive, by the mobile computing device, a unique identifier that identifies the identifying information in database associated with the alarm response server, receive a trigger of an alarm notification by one of a wearable device and the mobile computing device, determine a current location of the mobile computing device, transmit an alarm notification message to the alarm response server, the alarm notification message including the current location of the mobile computing device and the unique identifier, and transmit the current location of the mobile computing device to at least one drone.

Abstract: A mobile communication device includes at least one processor to display a user interface on a touch screen, the user interface comprising a button to receive a touch event, determine that the touch event is currently being received by the button and enter an alarm armed state, determine that the touch event ends and enter an alarm active state, and after a particular period of time in the alarm active state, trigger a communication to an emergency responder.

Abstract: A personal security system includes: a mobile electronic device including a processor and a user input mechanism, wherein the processor is adapted to provide an alarm trigger, wherein the processor is further adapted to: receive a command from a user to provide an armed alarm condition; initiate the armed alarm condition by receiving a continuous user command through the user input mechanism, wherein the continuous user command requires an active physical touch from the user; and when the user ceases to provide the active physical touch required to maintain the continuous user command, trigger an alarm condition. In some embodiments, in response to triggering the alarm condition, the processor communicates geo-location information to a remote server, wherein the geo-location information identifies the geo-location of the mobile electronic device at the time the alarm condition is triggered.