The Bubble regime of laser-plasma acceleration: monoenergetic electrons and the scalability

The Bubble regime of electron acceleration in ultra-relativistic laser plasma is considered. It has been shown that the bubble can produce ultra-short dense bunches of electrons with quasi-monoenergetic energy spectra. The first experiment in this regime done at LOA has confirmed the peaked electron spectrum (J. Faure, et al., {\it submitted}, 2004). The generated electron bunch may have density an order of magnitude higher than that of the background plasma. The bubble is able to guide the laser pulse over many Rayleigh lengths, thus no preformed plasma channel is needed for high-energy particle acceleration in the bubble regime. In the present work we discuss a simple analytical model for the bubble fields as well as the scaling laws.Comment: accepted for publication in Plasma Physics and Controlled Fusion, 200

Исследование двухстадийной инкапсуляции липофильных функциональных компонентов

Two-stage encapsulation of lipophilic functional components was investigated. It consists of emulsion preparation stage and spray drying. Influence of 10 factors on quality parameters (encapsulation efficiency, output capacity and residual moisture content) was estimated. The major factors were identified and recommended for design of the technology.Исследован процесс двухстадийной инкапсуляции липофильных функциональных компонентов, включающий стадии получения водно-масляной эмульсии и распылительной сушки. Проведена оценка степени влияния десяти факторов на такие ключевые характеристики, как: эффективность инкапсуляции, производительность по целевому продукту и остаточное влаго-содержание. Выявлены наиболее значимые и даны рекомендации для проведения промышленного эксперимента

Determination of the Carrier-Envelope Phase of Few-Cycle Laser Pulses with Terahertz-Emission Spectroscopy

The availability of few-cycle optical pulses opens a window to physical phenomena occurring on the attosecond time scale. In order to take full advantage of such pulses, it is crucial to measure and stabilise their carrier-envelope (CE) phase, i.e., the phase difference between the carrier wave and the envelope function. We introduce a novel approach to determine the CE phase by down-conversion of the laser light to the terahertz (THz) frequency range via plasma generation in ambient air, an isotropic medium where optical rectification (down-conversion) in the forward direction is only possible if the inversion symmetry is broken by electrical or optical means. We show that few-cycle pulses directly produce a spatial charge asymmetry in the plasma. The asymmetry, associated with THz emission, depends on the CE phase, which allows for a determination of the phase by measurement of the amplitude and polarity of the THz pulse

Enhanced superchannel transmission using phase conjugation

We demonstrate polarisation insensitive dual-band optical phase conjugation for multiple 400Gbit/s optical superchannels using a Raman amplified transmission link with a realistic span length of 75km. The resultant increase in transmission distance is confirmed analytically

Towards effective indirect radioisotope energy converters with bright and radiation hard scintillators of (Gd,Y)3Al2Ga3O12 family

Ceramics of quaternary garnets (Gd,Y)3Al2Ga3O12 doped with Ce, Tb have been fabricated and evaluated as prospective materials for indirect energy converters of α-and β-voltaic. Samples were characterized at excitation with an X-ray source and an intense 150 keV electron beam and showed good temperature stability of their emission and tolerance to irradiation. The role of X-rays accompanied the α-particle emitting in the increase of the conversion efficiency is clarified. The garnet-type structure of the matrix in the developed materials allows the production of quality crystalline mass with a light yield exceeding that of the commonly used YAG: Ce scintillator by a factor of two times. © 2022 Korean Nuclear SocietyMinistry of Education and Science of the Russian Federation, Minobrnauka: 075-15-2021-1353, FEUZ-2020-0060; Ministerstwo Edukacji i Nauki, MNiSW: 075-11-2021-070; Ministry of Science and Higher Education of the Russian FederationAuthors with affiliations b, d, e and f acknowledge support from Russian Ministry of Science and Education grant No. 075-15-2021-1353 . The scientific equipment provided by shared research facilities “Scientific Research Analytical Center of National Research Center “Kurchatov Institute” – IREA” was used, with financial support of Russian Federation, represented by the Ministry of Science and Higher Education, agreement No. 075-11-2021-070 dated August 19, 2021. The work was partially supported by the Ministry of Science and Higher Education of the Russian Federation (through the basic part of the government mandate, project No. FEUZ-2020-0060 ) (authors with affiliation “c”).Authors with affiliations b, d, e and f acknowledge support from Russian Ministry of Science and Education grant No. 075-15-2021-1353. The scientific equipment provided by shared research facilities “Scientific Research Analytical Center of National Research Center “Kurchatov Institute” – IREA” was used, with financial support of Russian Federation, represented by the Ministry of Science and Higher Education, agreement No. 075-11-2021-070 dated August 19, 2021. The work was partially supported by the Ministry of Science and Higher Education of the Russian Federation (through the basic part of the government mandate, project No. FEUZ-2020-0060) (authors with affiliation “c”)

Luminescence Spectroscopy of Quaternary Garnets Doped with Trivalent Rare-Earth Ions

Spectroscopy and energy transport in multi–ion ceramics with garnet structure (GYAGG) doped with rare–earth ions (Ce3+, Tb3+, Eu3+) were studied by photoluminescence (PL), cathodoluminescence (CL) and X–ray luminescence (XRL) methods.The work was partially supported by the Ministry of Science and Higher Education of the Russian Federation (through the basic part of the government mandate, project No. FEUZ-2020-0060)

Исследование и оптимизация процесса инкапсулирования лекарственного вещества в полимерную оболочку в аппарате псевдоожиженного слоя

The drug encapsulation by enteric film fluid-bed coating has been investigated. Influence of each operation parameter on product quality has been estimated and optimal conditions included film thickness have been determined. The model drug release kinetics of encapsulation product has been studied.Исследован процесс инкапсулирования модельного лекарственного вещества в кишечнорастворимую полимерную оболочку в аппарате с псевдоожиженным слоем. Выявлен вклад каждого из параметров процесса в качество получаемого продукта, определены оптимальные условия для нанесения пленки, исследована кинетика высвобождения инкапсулированного препарата

Разработка и моделирование технологии непрерывной распылительной сушки пробиотиков.

Spray drying has been offered as an alternative method for dry B.bifidum biomass obtaining for production of solid dosage forms. The complex of experimental and analytical researches has been carried out. On the basis of experimental data and modeling results, the recommendations have been given for the industrial process organizationПредложен альтернативный метод получения сухой биомассы бифидобактерий - распылительная сушка. Проведен комплекс экспериментальных и аналитических исследований. На основании экспериментальных данных и результатов моделирования выданы рекомендации по организации промышленного процесса

Construction of nutrient media for L-form brucella

Dry nutrient media on the basis of hepatic infusion and Siberian roach hydrolyzate are constructed. Experimental data demonstrate that these media possess high sensitivity, completely inhibit growth of S-form Brucella, do not require рН adjustment, filtration and autoclaving. They can be used for isolation, cultivation and accumulation of L-form Brucella for bacteriological diagnostics of brucellosis. As these media are accessible for transportation, they are applicable for stationary and field conditions