Abstract: In accordance with at least one aspect of this disclosure, a method includes flushing a cell stack for a predetermined amount of time as a function of an amount of combustible gas remaining in the cell stack. The method also includes operating a cell stack for a predetermined amount of time, then shutting down the cell stack and ceasing operation of the cell stack for a predetermined amount of time. Flushing occurs after shutting down a cell stack power supply. The method further includes restarting operation of the cell stack after flushing.

Abstract: Variable temperature analytical instruments are provided that can include: a mobile component comprising a cold source; a substantially fixed analysis component; and an interface configured to couple the mobile component with the analysis component. Variable temperature analytical instruments are also provided that can include: a mobile analysis component; a substantially fixed component comprising a cold source; and an interface configured to couple the mobile component with the analysis component. Variable temperature analytical instruments are also provided that can include: a cold source in thermal communication with an analysis component; and at least one pressure barrier defining a plurality of discrete masses maintained at different temperatures between the cold source and the analysis component.

Abstract: An apparatus for processing agricultural product having a main frame, a support for the main frame configured so that the main frame can be advanced in an operating direction over an area in which agricultural product is grown, and an operating system on the main frame configured to advance unearthed agricultural product intermixed with debris in a conveying direction in a conveying path between an input location and a first point of use. A first processing assembly a) advances unearthed agricultural product intermixed with debris in the conveying direction towards the first point of use; and b) allows intermixed debris to separate from the agricultural product as it is advanced in the conveying direction. A plurality of processing assemblies downstream of the first processing assembly separate intermixed debris in the form of vines from the agricultural product in different manners as the agricultural product is advanced in the conveying direction.

Abstract: An apparatus for processing agricultural product having a main frame, a support for the main frame configured so that the main frame can be advanced in an operating direction over an area in which agricultural product is grown, and an operating system on the main frame configured to advance unearthed agricultural product intermixed with debris in a conveying direction in a conveying path between an input location and a first point of use. A first processing assembly a) advances unearthed agricultural product intermixed with debris in the conveying direction towards the first point of use; and b) allows intermixed debris to separate from the agricultural product as it is advanced in the conveying direction. A plurality of processing assemblies downstream of the first processing assembly separate intermixed debris in the form of vines from the agricultural product in different manners as the agricultural product is advanced in the conveying direction.

Abstract: Embodiments of a method for assessing potential nitrogen concentration of plant available nitrogen in soil comprises collecting soil samples, analyzing one or more of the soil samples to compute the amount of nitrate and the amount of ammonium, analyzing one or more of the soil samples to compute the amount of mineralizable nitrogen using a soil respiration method, obtaining a total plant available nitrogen value in the soil samples by summing the computed nitrate value, the computed ammonium value, and the computed mineralizable nitrogen value, and calculating a potential nitrogen assessment value by subtracting from the total plant available nitrogen value an amount of nitrogen applied at time of planting not represented within the soil sample and further subtracting an amount of nitrogen required to achieve the crop yield goal multiplied by the yield crop goal.

Abstract: Embodiments of a method for assessing potential nitrogen concentration of plant available nitrogen in soil comprises collecting soil samples, analyzing one or more of the soil samples to compute the amount of nitrate and the amount of ammonium, analyzing one or more of the soil samples to compute the amount of mineralizable nitrogen using a soil respiration method, obtaining a total plant available nitrogen value in the soil samples by summing the computed nitrate value, the computed ammonium value, and the computed mineralizable nitrogen value, and calculating a potential nitrogen assessment value by subtracting from the total plant available nitrogen value an amount of nitrogen applied at time of planting not represented within the soil sample and further subtracting an amount of nitrogen required to achieve the crop yield goal multiplied by the yield crop goal.