Abstract: Disclosed herein are nuclear densitometer assemblies for measuring density of fracturing fluid in a pipe, which includes a nuclear densitometer assembly that may include: a lower plate; a support post extending from the lower plate, the support post capable of supporting a portion of the pipe; an upper plate; a nuclear source coupled to the upper plate; a nuclear detector coupled to the upper plate; wherein a portion of the pipe may be capable of being disposed between the nuclear source and the nuclear detector.

Abstract: An apparatus adapted to be rotatably mounted proximate a discharge opening of a grain bin can include a guard. The guard can have a plurality of knife units having a plurality of spaced apart blades having grain engaging cutting edges for cutting and breaking up compacted grain. A sweep portion can include an auger rotatably driven about an auger axis by a motor. The sweep portion can be arranged substantially parallel and proximate to a floor of the grain bin. Rotation of the auger can urge grain to move toward the discharge opening. A mounting assembly can be adapted to operably couple the guard and the sweep portion such that the guard and the sweep portion rotate concurrently about the floor of the grain bin.

Abstract: A time-delay RC circuit, having a preselected time constant, is connected ross a reserve battery undergoing activation. The function of the circuit is to hold off the application of the load of a power utilization device until the battery is sufficiently activated. Since the drain rate of the time-delay circuit is very small, it does not retard activation via polarization as would be the case if the full load were draining the battery during activation. A first switching transistor is connected across the charging capacitor of the RC circuit and turns on when the time constant is reached. When the first switching transistor is turned on, it turns on a second switching transistor connected between the battery and the utilization device.