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A gas discharge between two liquid electrolyte electrodes was studied experimentally in the current range of 0.5-3.5 A. As liquid electrolytes, aqueous solutions of sodium chloride, sodium carbonate, potassium hydroxide and copper sulfate, as well as tap water, were used. The effect of composition of electrolytes on characteristics of discharge was studied at different polarities of connection to the power source.

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A modernized Harrington function with three zones of evaluation indicators is proposed: excellent-good-satisfactory for making a decision on choosing the best design of a combine harvester. Harrington’s desirability function is used only in the 0.2 … 0.8 section, in the interval of which the system of j-th estimated indicators with its own units of measurement (operating costs, grain losses, labor costs, energy consumption of the combine harvesting process) is located. The developed desirability scales were used based on economic tests of combines. Dependences are obtained for converting the values of experimental estimated indicators to a dimensionless scale limited by the range of the desirability function 0.2 … 0.8. By the method of paired comparison of the estimated indicators, their rank place, the weight coefficient of each indicator used in calculating the generalized criterion for the comprehensive assessment of each combine harvester was determined. The maximum value of the criterion determines the best design of the combine from the alternative. The values of the D i k criteria for the integrated assessment of combines with and without weight factors (mean geometric value of the criteria) have been analysed. When using the latter, a more significant difference was obtained between the compared designs of combines. Such a comparison can be applied to carry out comparative tests of combines under the same conditions (yield, moisture, weediness, etc.). The purpose of the work is to substantiate, using the example of a group of compared grain harvesters, the best design option using the proposed system of evaluation indicators and generalized criteria for complex evaluation.