15 research outputs found

    Population dynamics in compressible flows

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    Organisms often grow, migrate and compete in liquid environments, as well as on solid surfaces. However, relatively little is known about what happens when competing species are mixed and compressed by fluid turbulence. In these lectures we review our recent work on population dynamics and population genetics in compressible velocity fields of one and two dimensions. We discuss why compressible turbulence is relevant for population dynamics in the ocean and we consider cases both where the velocity field is turbulent and when it is static. Furthermore, we investigate populations in terms of a continuos density field and when the populations are treated via discrete particles. In the last case we focus on the competition and fixation of one species compared to anotherComment: 16 pages, talk delivered at the Geilo Winter School 201

    Study of the fractional composition of electroerosive powder materials of the tungsten nickel iron alloy obtained in lighting kerosene

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    The article presents the results of experimental research aimed at studying the fractional composition of electroerosive powder materials of the tungsten nickel iron alloy obtained in lighting kerosene. It has been found that more than half of the total number of particles is particles with a size of less than 47.7 microns. It was also noted that particles with a size less than or equal to 29.37 microns in the powder include 20.0% of the total volume. The conducted research makes it possible to determine the most relevant field of application of the obtained powder materials and will improve the quality of scientific and technical developments in the field of application of electroerosive powder materials

    Study of the fractional composition of electroerosive powder materials of the tungsten nickel iron alloy obtained in lighting kerosene

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    The article presents the results of experimental research aimed at studying the fractional composition of electroerosive powder materials of the tungsten nickel iron alloy obtained in lighting kerosene. It has been found that more than half of the total number of particles is particles with a size of less than 47.7 microns. It was also noted that particles with a size less than or equal to 29.37 microns in the powder include 20.0% of the total volume. The conducted research makes it possible to determine the most relevant field of application of the obtained powder materials and will improve the quality of scientific and technical developments in the field of application of electroerosive powder materials
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