Abstract: A rotary impact tool includes a motor housing, an electric motor supported in the motor housing, and a drive assembly for converting a continuous torque input from the motor to consecutive rotational impacts upon a workpiece. The drive assembly includes an anvil including an anvil lug and a hammer that is both rotationally and axially movable relative to the anvil. The hammer includes a hammer lug for imparting the consecutive rotational impacts upon the anvil lug. The rotary impact tool further comprises a printed circuit board assembly including a sensor that is configured to detect rotation of the anvil. The printed circuit board assembly is spaced from the anvil to define an axial gap therebetween.

Abstract: A fire detection and suppression system includes a fire suppression system configured to suppress a fire in an area, a temperature sensor configured to measures a zone temperature for each of a plurality of zones in the area, and a controller. The controller is configured to receive the zone temperatures from the temperature sensor for each of the plurality of zones, detect a hazard condition in a first zone of the plurality of zones based on the zone temperature for the first zone, and activate the fire suppression system in response to detecting the hazard condition in the first zone.

Abstract: An assistive pushcart device for rollerblading includes a set of first wheels and a set of second wheels that are rotationally coupled to a frame proximate to a front and a back of the frame, respectively. A handle that is coupled to and extends transversely from the back of the frame is configured to be grasped in one or two hands of a user to stabilize the user as the user locomotes the frame along a surface. Each of set of brakes is operationally coupled to a respective one of the first wheels and the second wheels. The set of brakes is positioned to selectively slow and stop rotation of at least one of the first wheels and the second wheels. An actuator that is coupled to the handle and operationally coupled to the set of brakes is positioned to selectively actuate the set of brakes.

Abstract: An assistive pushcart device for rollerblading includes a set of first wheels and a set of second wheels that are rotationally coupled to a frame proximate to a front and a back of the frame, respectively. A handle that is coupled to and extends transversely from the back of the frame is configured to be grasped in one or two hands of a user to stabilize the user as the user locomotes the frame along a surface. Each of set of brakes is operationally coupled to a respective one of the first wheels and the second wheels. The set of brakes is positioned to selectively slow and stop rotation of at least one of the first wheels and the second wheels. An actuator that is coupled to the handle and operationally coupled to the set of brakes is positioned to selectively actuate the set of brakes.

Abstract: Various embodiments include apparatuses and systems for controlling compressor clearances. In one case, an apparatus includes: a material layer sized to fit a case of a gas turbine (GT) compressor in a GT system, the material layer including a heating element for applying heat to the case of the GT compressor; and a control system coupled with the material layer, the control system configured to: determine whether a shutdown sequence is occurring in the GT system; and actuate the heating element to apply heat to the case of the GT compressor in response to determining that the shutdown sequence is occurring.

Abstract: Various embodiments include apparatuses and systems for controlling compressor clearances. In one case, an apparatus includes: a material layer sized to fit a case of a gas turbine (GT) compressor in a GT system, the material layer including a heating element for applying heat to the case of the GT compressor; and a control system coupled with the material layer, the control system configured to: determine whether a shutdown sequence is occurring in the GT system; and actuate the heating element to apply heat to the case of the GT compressor in response to determining that the shutdown sequence is occurring.

Abstract: A hazard alarm includes: a detector for detecting a hazard parameter, trigger logic; and reset logic. The trigger logic triggers an alarm state when the measured parameter reaches a predetermined trigger threshold. The alarm state is maintained until a reset is successfully performed. The reset logic, upon a reset command, resets the alarm state if the measured parameter is below a predetermined reset threshold, and inhibits resetting of the alarm state if the measured parameter is above the predetermined reset threshold.

Abstract: A hazard alarm includes: a detector for detecting a hazard parameter; trigger logic; and reset logic. The trigger logic triggers an alarm state when the measured parameter reaches a predetermined trigger threshold. The alarm state is maintained until a reset is successfully performed. The reset logic, upon a reset command, resets the alarm state if the measured parameter is below a predetermined reset threshold, and inhibits resetting of the alarm state if the measured parameter is above the predetermined reset threshold.

Abstract: A Bragg reflection grating is written in photosensitive optical fiber using ultra-violet light from an ArF excimer laser with the aid of a phase grating to create a fringe pattern. The writing is effected by a type II damage process performed in two stages, the first of which involves the creation of a low reflectivity grating, which is incubated to greater reflectivity in the second stage. Incubation is performed without the use of any fringe pattern.