Abstract: Example aspects include techniques for implementing self-checkout via self-deactivating security tags. These techniques may include verifying, via communications with a server device, payment for a product using an electronic device. In addition, the techniques may include unlocking, via a pad of a kiosk, a security tag from the product based at least in part on confirmation of the payment for the product.

Abstract: Systems and methods for operating a Security Tag (“ST”) coupled to an item. The methods comprise: storing first Item Related Information (“IRI”) is a datastore of ST that is associated with an output device and second IRI in an integrated RFID element of ST; receiving third IRI at a microcontroller of ST; performing comparison operations by the microcontroller to compare the third IRI with the first and/or second IRI; using the third IRI to write over the first and/or second IRI based on results of the comparison operations; and synchronizing advertised information and register information for the item by outputting the third IRI from the output device and the integrated RFID element.

Abstract: Systems and methods for operating a security tag. The methods comprise: receiving a first wireless signal transmitted from a transmit circuit using a receive circuit of the security tag; inducing a voltage in the receive circuit of the security tag while the first wireless signal is being received; performing operations by the controller to selectively close a switch when the voltage is being induced in the receive circuit; and causing a release of a mechanical component of the security tag by allowing energy to flow from the receive circuit to the mechanical component when the switch is closed.

Abstract: This document describes systems and techniques for a control system for a grid-forming inverter. In aspects, a reactive power current-limiting subsystem, based on a measured reactive power, is configured to generate a first signal representing a magnitude of a modulation waveform presentable to a pulse-width modulator configured to direct transistors in the inverter of the grid-forming inverter. An active power current-limiting subsystem, based at least in part on a measured active power, is configured to generate a second signal representing a rotating phase angle of the modulation waveform presentable to the pulse-width modulator. The reactive power current-limiting subsystem and active power current-limiting subsystem are configured to cause an alternating current (AC) output of the grid-forming inverter to resume a nominal form subsequent to current being directed around one or more transistors in an inverter to prevent an excessive output current from flowing through the one or more transistors.

Abstract: Circuit breakers and associated methods are described. According to one aspect, a circuit breaker includes an input node configured to receive an AC waveform of electrical energy, an output node configured to output the AC waveform, mechanical breaker circuitry configured to selectively operate in a conductive state to conduct the AC waveform from the input node to the output node, switching circuitry configured to selectively operate in a conductive state to conduct the AC waveform from the input node to the output node, energy absorption circuitry coupled with the input node and the output node, wherein the mechanical breaker circuitry and the switching circuitry are changed from the conductive state to a non-conductive state after detection of a fault, and wherein the energy absorption circuitry is configured to dissipate electrical energy of the fault after the mechanical breaker circuitry and the switching circuitry are changed to the non-conductive state.

Abstract: This document describes systems and techniques for a current-limiting control strategy for single-loop droop-controlled grid-forming inverters. In aspects, a hysteresis module is configured to compare an output current detected across one or more transistors in an inverter controlled by the single-loop droop converter with a specified maximum current and to generate an overcurrent signal. The overcurrent signal presents a fault signal responsive to the output current exceeding the specified maximum current. A logic array is configured to logically combine gate control signals generated by the single-loop droop controller to selectively direct the one or more transistors to allow the output current to flow therethrough with the overcurrent signal to present modified gate control signals to the one or more transistors.

Abstract: An unmanned aerial vehicle (UAV) having at least one sensor for detecting the presence of a survivor in a search and rescue area. The at least one sensor is preferably an ultra-wide band (UWB) transceiver sensor. The UAV includes a UAV data link transceiver for wirelessly communicating information concerning the survivor to a command center.

Abstract: Systems and methods for operating a security tag. The methods comprise: receiving a first wireless signal using a receive circuit of the security tag; inducing a voltage in the receive circuit of the security tag while the first wireless signal is being received; performing operations by a controller to selectively close a switch while the voltage is being induced in the circuit; causing a release of a mechanical component of the security tag by allowing energy to flow from the receive circuit to the mechanical component when the switch is closed; and performing operations by the controller to prevent damage to the mechanical component as a result of the security tag being a certain distance from an external device.

Abstract: A novel transgene for use to produce a coronavirus vaccine is provided. The transgene encodes: i) an RNA polymerase promoter; ii) a 5? UTR; iii) a secretory sequence; iv) a coronavirus spike protein component, wherein the spike protein component incorporates a variant sequence at amino acid position 614 of a native spike protein; and v) a 3? UTR and poly A sequence. A vaccine is also provided comprising the transgene or an mRNA transcript thereof.

Abstract: An unmanned aerial vehicle (UAV) having at least one sensor for detecting the presence of a survivor in a search and rescue area. The at least one sensor is preferably an ultra-wide band (UWB) transceiver sensor. The UAV includes a UAV data link transceiver for wirelessly communicating information concerning the survivor to a command center.

Abstract: Systems and methods for operating an Electronic Smart Tag (“EST”). The methods involve: operating the EST in a first operational state in which first item related information is output from an electronic output device of the EST that is powered by an energy storage device storing energy harvested from an external energy source; detecting when a charge level of the energy storage device reaches or falls below a first threshold level; and transitioning an operational state of the EST from the first operational state to a second operation state in which a message is output from EST requesting that a mobile device be placed in proximity to the EST for purposes of obtaining at least a first portion of the first item related information, in response to the detection that the charge level of the energy storage device has reached or fallen below the first threshold level.

Abstract: Systems and methods for performing inventory management. The methods comprise: measuring, by an Out Of Stock (“OOS”) sensor at a first time, a first collective weight of a plurality of items disposed thereon; measuring, by the OOS sensor at a second later time, a second collective weight of a plurality of items disposed thereon; using the first and second collective weights to determine if an item has been added to or removed from the OOS sensor; and wirelessly communicating, from the OOS sensor to a remote computing device, a notification that an item has been added to or removed from the OOS sensor such that stored inventory information is updated accordingly. The OOS sensor comprises a base layer having a planar cross-sectional profile and an array of weight measuring sensors (e.g., piezoresistive sensors).

Abstract: Systems and methods for dynamically changing displayed content of a tag coupled to an item. The methods comprising: detecting when an individual is in proximity to the tag; triggering operations, by a computing device remote from the tag, to obtain customer related information associated with the individual, when a detection is made that the individual is in proximity to the tag; determining, by the computing device, a price discount for the item based on the customer related information which was previously obtained; and dynamically changing the displayed content of the tag to include the price discount while the individual is still in proximity to the tag.

Abstract: An unmanned aerial vehicle (UAV) having at least one sensor for detecting the presence of a survivor in a search and rescue area. The at least one sensor is preferably an ultra-wide band (UWB) transceiver sensor. The UAV includes a UAV data link transceiver for wirelessly communicating information concerning the survivor to a command center.

Abstract: Systems and methods for dynamically changing displayed content of a tag coupled to an item. The methods comprising: detecting when an individual is in proximity to the tag; triggering operations, by a computing device remote from the tag, to obtain customer related information associated with the individual, when a detection is made that the individual is in proximity to the tag; determining, by the computing device, a price discount for the item based on the customer related information which was previously obtained; and dynamically changing the displayed content of the tag to include the price discount while the individual is still in proximity to the tag.

Abstract: An unmanned aerial vehicle (UAV) having at least one sensor for detecting the presence of a survivor in a search and rescue area. The at least one sensor is preferably an ultra-wide band (UWB) transceiver sensor. The UAV includes a UAV data link transceiver for wirelessly communicating information concerning the survivor to a command center.

Abstract: Systems and methods for operating an Electronic Smart Tag (“EST”). The methods involve: operating the EST in a first operational state in which first item related information is output from an electronic output device of the EST that is powered by an energy storage device storing energy harvested from an external energy source; detecting when a charge level of the energy storage device reaches or falls below a first threshold level; and transitioning an operational state of the EST from the first operational state to a second operation state in which a message is output from EST requesting that a mobile device be placed in proximity to the EST for purposes of obtaining at least a first portion of the first item related information, in response to the detection that the charge level of the energy storage device has reached or fallen below the first threshold level.

Abstract: Systems and methods for performing inventory management. The methods comprise: measuring, by an Out Of Stock (“OOS”) sensor at a first time, a first collective weight of a plurality of items disposed thereon; measuring, by the OOS sensor at a second later time, a second collective weight of a plurality of items disposed thereon; using the first and second collective weights to determine if an item has been added to or removed from the OOS sensor; and wirelessly communicating, from the OOS sensor to a remote computing device, a notification that an item has been added to or removed from the OOS sensor such that stored inventory information is updated accordingly. The OOS sensor comprises a base layer having a planar cross-sectional profile and an array of weight measuring sensors (e.g., piezoresistive sensors).

Abstract: Systems and methods for operating a security tag. The methods comprise: receiving a first wireless signal using a receive circuit of the security tag; inducing a voltage in the receive circuit of the security tag while the first wireless signal is being received; performing operations by a controller to selectively close a switch while the voltage is being induced in the circuit; causing a release of a mechanical component of the security tag by allowing energy to flow from the receive circuit to the mechanical component when the switch is closed; and performing operations by the controller to prevent damage to the mechanical component as a result of the security tag being a certain distance from an external device.

Abstract: Systems and methods for operating a security tag. The methods comprise: receiving a first wireless signal using a receive circuit of the security tag; inducing a voltage in the receive circuit of the security tag while the first wireless signal is being received; performing operations by a controller to selectively close a switch while the voltage is being induced in the circuit; causing a release of a mechanical component of the security tag by allowing energy to flow from the receive circuit to the mechanical component when the switch is closed; and performing operations by the controller to prevent damage to the mechanical component as a result of the security tag being a certain distance from an external device.