ОДНОМЕРНАЯ ЭЛЕКТРОМАГНИТНАЯ ПОЛОСОВАЯ СТРУКТУРА ИЗ ПЛАЗМЕННЫХ СТОЛБОВ

The results of simulation and experimental study of the one-dimensional electromagnetic band gap structure formed solely by plasma columns in the waveguide of X frequency band (3 cm wavelength range) are presented. The simulations show that the plasma structure is formed at a value of the electron density more than 1014 cm–3 and of the plasma column diameter of 3–4 mm. Computations are in good agreement with experimental data. The possibility of variation of the microwave pulse duration from 10 microseconds to tens of nanoseconds is demonstrated. The plasma electromagnetic band gap structure was tested at high microwave power (~50 kW).Представлены результаты моделирования и экспериментального исследования одномерной электромагнитной полосовой структуры, образованной исключительно плазменными столбами в волноводе 3-сантиметрового диапазона длин волн. Моделирование показало, что у плазменной электромагнитной полосовой структуры формируется полосовой спектр пропускания при значениях концентрации электронов в плазменных столбах более 1014 см–3 и диаметре столбов 3–4 мм. Расчетные спектры пропускания находятся в хорошем согласии с экспериментальными данными. Продемонстрирована возможность изменения длительности импульса СВЧ от 10 микросекунд до десятков наносекунд. Плазменная электромагнитная полосовая структура также протестирована при большой мощности СВЧ излучения (~50 кВт)

ЧИСЛЕННЫЕ РЕШЕНИЯ ДЛЯ СОБСТВЕННЫХ МОД АБСОЛЮТНОЙ ПАРАМЕТРИЧЕСКОЙ РАСПАДНОЙ НЕУСТОЙЧИВОСТИ НЕОДНОРОДНОЙ ПЛАЗМЫ НА НЕЛИНЕЙНОЙ СТАДИИ

A mathematical model for the nonlinear absolute decay parametric instability of inhomogeneous plasma is developed. Decay of the Langmuir pump wave on the Langmuir and ion-acoustic waves is considered in detail. The numerical solutions describing the eigen modes of the instability are obtained. It is shown that at the nonlinear stage of the instability, a depletion of a pump wave and a broadening of an ion-acoustic wave spectrum are observed. The simulation results are in agreement with the experimental ones.Создана математическая модель, описывающая нелинейную абсолютную параметрическую неустойчивость в неоднородной плазме. Подробно рассмотрен распад ленгмюровской волны накачки на ленгмюровскую и ионно- звуковую волны. Получены численные решения, описывающие собственные моды неустойчивости. Показано, чтов нелинейной стадии неустойчивости наблюдается истощение накачки и уширение спектра ионно-звуковой волны. Результаты численных расчетов согласуются с экспериментальными результатами

БАКТЕРИЦИДНЫЕ КОМПОНЕНТЫ В ВОЗДУШНОЙ ПЛАЗМЕННОЙ СТРУЕ ПРИ ПОСТОЯННОМ И ИМПУЛЬСНО-ПЕРИОДИЧЕСКОМ ТОКОВЫХ РЕЖИМАХ

Atmospheric pressure air plasma jets within dc, pulsed and self-oscillatory current regimes are realized. It is shown that the main mechanism of inactivation of bacteria Staphylococcus aureus is the effect of chemically active molecules of NO, NO2 and HNO2. The method of IR absorption spectroscopy is used to investigate chemical active component concentrations. The optimal regime of discharge inducing plasma jets, which is more suitable for production of bactericidal components, is found. Получены воздушные плазменные струи атмосферного давления на постоянном, импульсно-периодическом и автоколебательном токовых режимах. Показано, что основным механизмом инактивации бактерий Staphylococcus aureus является воздействие химически активных молекул NO, NO2 и HNO2. Методом ИК-абсорбционной спектроскопии определены их концентрации. Выявлен оптимальный режим разряда, индуцирующий плазменные струи, наиболее подходящий для получения бактерицидных компонент.

The transmission spectrum switching speed of electromagnetic band gap plasma structure

International audienc

Absolute parametric decay instability control by the complementary pump

The possibility of deep parametric decay instability suppression by launching a complementary (small power) pump wave possessing a slightly shifted frequency is demonstrated experimentally. This suppression is achieved at an additional pump wave frequency shift equal to the frequency separation of ion acoustic eigenmodes excited in plasma as a result of absolute parametric decay instability. The recovery of microwave power absorption at the second pump turn on is shown using measurements of the plasma luminosity and accelerated electron fluxes

Determination of electron density in plasma used for the waveguide band-pass filter control

Financial support of BRFBR grants (F11F-002, F11M-044) is acknowledged

DC atmospheric pressure glow microdischarges in the current range from microamps up to amperes

Electrical and spectroscopic results of comprehensive investigations of microdischarges in atmospheric pressure helium, argon, nitrogen and air at gaps less than 1 mm and over a large current range from microamperes up to amperes are presented. At distance shorter than 1 mm, electrodes influence the normal glow discharge structure and their electrical and optical parameters. Two oscillation discharge regimes were revealed in discharge current range comparable or less than the low-current limit of normal glow discharge

Development Of Molecular Markers In Redbay

Woody plant redbay (Persea borbonia) is a native species in South Carolina whose fine-grained wood is industrially valuable and whose fruits are a valuable food source for animals. However, laurel wilt disease has caused high levels of redbay death, threatening the sustainability of this economically and ecologically important woody plant species. Planting resistant clones of trees is the most promising approach to combat the disease. Large-scale development of molecular markers is imperative in molecular breeding for crop improvement. This project aimed to initiate a small-scale analysis of approximately 200 markers obtained from a shallow genome sequencing project of redbay. The markers that were being used targeted microsatellites, small tandem repeats of DNA that are highly mutable. Of the 213 markers being tested, polymerase chain reaction (PCR) amplification success rate was 94% among the 8 individuals that were used. A total of 160 markers had amplicons that were at least 100 base pairs in length. When fully characterized, these markers will be valuable in linkage map construction, molecular characterization of germplasm collections, and analysis of genetic diversity in redbay