Abstract: Systems, methods and apparatus for detecting stalks processed by a combine harvester, for measuring stalk diameters, and for displaying harvest metrics and yield data to a user based on stalk locations and stalk diameters.

Abstract: A method for automatic control switching for driving a sensorless motor of a power tool, the method including generating, using a signal generator, a high-frequency injection signal. The method includes coupling, using a coupling circuit, the high-frequency injection signal to an injection coil of the sensorless motor. The method includes decoupling, using a de-coupling circuit, a response to the high-frequency injection signal from a phase coil of the sensorless motor. The method includes determine a sensorless motor condition based upon the response of the injection coil to the high-frequency injection signal. The method includes driving, using a controller of the power tool, the sensorless motor based upon the sensorless motor condition.

Abstract: A lamp having a hydrocarbon fuel source is provided. The lamp includes a housing and a fuel source containing hydrocarbon fuel. A mantle is disposed inside the housing and is in communication with the exit of the fuel source. A cover is attached to the housing in thermal communication with the interior housing. The cover has a slot and a replaceable pad is disposable in the slot; the pad preferably contains a volatilizable substance. When the fuel egresses the fuel source and is ignited and burns, heat generated from the fuel is conducted through the cover to the pad so that the volatilizable substance is volatilized. The volatilizable substance is preferably an insect repellent. The lamp may be portable such as a flashlight. A separately attachable cover that may retrofit an existing lamp is also provided.