Nano electrical discharge machining – the outlook, challenges, and opportunities

Spark discharges in water have great potential for use in various technological fields, including pollutant degradation, precision micromachining, and nanomaterial production. However, the large-scale application of these discharges is limited by the complexity of the implicated physical and chemical phenomena, which cannot be easily controlled. In this study, we assess the effect of an external B-field on the electrical characteristics of multiple successive discharges, as well as on the erosion of the electrode. In addition to the B = 0 condition, two configurations of the B-field are investigated: B-parallel and B-perpendicular to the electrode axis, both at the magnitude of 125 mT. The obtained results demonstrate that discharge electrical characteristics and electrode erosion are significantly affected by the B-field. Using a W electrode, the highest and lowest discharge currents are measured in the case of B-perpendicular and B = 0, respectively. Meanwhile, the highest erosion volume is obtained in the case of B = 0. To assess the influence of electrode nature and magnetic properties on the discharges, the results obtained using W (paramagnetic) electrodes were compared to those obtained with Ni (ferromagnetic). The comparison shows that the discharge electrical data are tightly distributed when the Ni electrode is utilized, regardless of the B-condition, whereas the data obtained with the W electrode exhibit significant statistical variations in the presence of the B-field. Overall, the data reported herein indicate that the electrical properties of a spark discharge may be varied and controlled by applying an external B-field.

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“…Specifically, atomic force microscope was used to finely control the gap distance at the nanoscale (i.e. nano-EDM) [14].…”

Section: Introductionmentioning

confidence: 99%

Influence of B-field on the characteristics of pulsed spark discharges in water

Geraud

Valensi

Hamdan

2022

Journal of Applied Physics

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“…Автор для переписки: Вдовин Владимир Александрович, vdv@cplire.ru Введение В настоящее время генераторы наносекундных видеоимпульсов напряжения становятся все более востребованными [1][2] как для фундаментальных физических исследований (ускорители заряженных частиц [3][4][5]; изучение стримерных разрядов [6]), так и для прикладных физических задач (рентгеноимпульсные аппараты [7][8]; источники [9] и излучатели [10][11][12] высокоинтенсивных сверхширокополосных микроволновых импульсов, используемые, например, для радаров [13]; генераторы накачки для полупроводниковых [14][15] и газовых [16][17] лазеров; технология электроэрозионного фрезерования [18][19]; альтернативный способ дезинтеграции минеральных руд [20]). Кроме того, значительный интерес представляет изучение воздействия нано-и субнаносекундных видеоимпульсов напряжения на биологические объекты (микроорганизмы в воде [21] и жидких пищевых продуктах [22]; мембраны клеток [23][24]; раковые опухоли [25]).…”

unclassified

Discriminative suppression of interference in the superwideband radio channel

Trofimenko,

Kostin

2023

JRE

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Scientific and practical results and technical recommendations in the field of adaptive application of methods and means of radio-vision recognition of ultra-short pulse signals for radio monitoring and identification of channels of digital ultra-wideband radio communication are presented. As methods of research in the work are used the fundamental provisions of statistical radio engineering, as well as algorithms for the optimal detection of signals with a priori known parameters under the influence of additive white noise. As a fight against interference in the propagation of ultrashort pulses, a convolutional discriminatory method of compensation of resonant radio clicks is proposed. It was found that when using the discriminative parameters at a signal to noise ratio of 12 dB, the recognition probability is not less than 0.9.

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