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In this paper, the influence of pulsed-periodic sequence of nanosecond electrical discharges on drying drops of coffee was examined. In the absence of discharges the well-known "coffee ring effect" on metal foil was observed. However, after exposure to discharges, the stain of dried droplets had another look and structure. The fundamental significance of the work is to provide a new method of controlling of coffee rings by using nanosecond repetitively pulsed electric discharges affecting the top of the drying droplets. In particular, it turned out that the coffee particles were distributed more evenly over the area of the stain due to electrohydrodynamic flows that occur in the drop under the action of discharges. This effect can be used, for example, in inkjet printing. [ABSTRACT FROM AUTHOR]

This paper describes the chip that is used for generating nanosecond surface micron-size discharges, as well as the results of observations of their interaction with surfaces of living tissues of plants: onion shell, leaves of Canada water weed, and day nettle petals. The interaction was observed for the first time in cellular size range. It was identified that the trajectories of plasma discharge channels follow intercellular walls and have a zigzag shape. It was also identified that a single discharge having <0.5 mJ energy results in destruction of cell wall, which stimulates intensive juice excretion. [ABSTRACT FROM AUTHOR]