Abstract: A method for hazard detection and fire prevention during mobile refueling operation includes: accessing a geospatial position of a mobile refueling platform; detecting the geospatial position within a geospatial region as a first condition in a set of conditions, the geospatial region permitted for refueling operation; accessing a distance between the mobile refueling platform and a surface of an object proximal the mobile refueling platform; detecting the distance exceeding a distance threshold as a second condition in the set of conditions; accessing a concentration of a gas proximal the mobile refueling platform; detecting the concentration falling below a concentration threshold as a third condition in the first set of conditions; and in response to the set of conditions corresponding to a set of target conditions for mobile refueling operation, transmitting a control signal to open a fuel valve of the mobile refueling platform.

Abstract: A system includes a battery rack including a frame configured to support a battery tray, the frame including: an inlet fluidly coupled a fluid supply; and a set of columns fluidly coupled to the inlet, each column including perforations arranged on the column and facing an interior of the battery rack, and each column defining a channel configured to circulate fluid from the inlet to the perforations. The system also includes: a valve interposed between the fluid supply and the inlet; a sensor configured to generate a signal representing ambient condition proximal the battery rack; and a controller configured to trigger the valve to transition from a closed state to an open state in response to detecting a precursor condition to a fire event based on the signal.

Abstract: An orthopedic fixation device for affixing the screw head of a polyaxial pedicle screw has a tulip, a saddle, and a ring. The tulip has an interior cavity and two opposed threaded arms and a lower ledge. The saddle is inserted into the tulip body, and has a U shaped groove for receiving a spinal fixation rod. The ring has a diameter that is smaller than the widest diameter of the screw head, and is formable into a diameter larger than the widest diameter of the screw head when the screw head is pushed into the ring. The ring has a connection portion that mates with a connection portion of the saddle. The screw head is clamped within the tulip body between the saddle and the ring when a cap is threaded between the tulip arms.