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Том 46, № 8 (2019)

Год: 2019
Статей: 7
URL: https://journals.rcsi.science/1068-3356/issue/view/14165

Article

Low-Frequency Stimulated Scattering in an Aqueous Suspension of Dielectric Nanospheres

Bunkin A., Davydov M., Pershin S., Suyazov N., Fedorov A.

Аннотация

A low-frequency stimulated scattering (LFSS) signal caused by pulsations of nanospheres under an electromagnetic field is detected in an aqueous suspension of dielectric nanospheres of three diameters (∼74 nm, ∼292 nm, and ∼540 nm) at various particle concentrations. The frequency shifts of the scattering line, calculated based on the developed model, are in good agreement with the measurement results.

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Bulletin of the Lebedev Physics Institute. 2019;46(8):243-247

243-247

(Eng)

(JATS XML)

Synthesis of Iron-Based Superconductor Ba_0.6K_0.4Fe₂As₂ by Mechanical Alloying

Maltsev E., Pervakov K., Vlasenko V.

Аннотация

A polycrystalline sample of superconductor Ba_0.6K_0.4Fe₂As₂ was synthesized by mechanical alloying, which was confirmed by the X-ray diffraction analysis. The sample heat treatment time is reduced more than twice in comparison with the heat treatment time in the solid-phase synthesis method. The superconducting transition temperature of the synthesized sample is 37 K, which is close to the critical temperature for the Ba_0.6K_0.4Fe₂As₂ single crystal.

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Bulletin of the Lebedev Physics Institute. 2019;46(8):248-250

248-250

(Eng)

(JATS XML)

Study of the Pallasite Radiation History by Track Analysis

Alexeev V., Bagulya A., Volkov A., Gippius A., Goncharova L., Gorbunov S., Grachev V., Dashkina A., Kalinina G., Konovalova N., Okateva N., Pavlova T., Polukhina N., Starkov N., Soe T., Chernyvsky M., Shchedrina T.

Аннотация

This work was performed within the OLYMPIA experiment on the study of tracks of heavy and superheavy cosmic ray nuclei in olivine crystals from Marjalahti and Eagle Station pallasites. Depth distributions of the track formation rate for heavy cosmic ray nuclei in olivine crystals from pallasites of different pre-atmospheric sizes were obtained. The dependences obtained were used to analyze the data on the track density in olivine crystals from the Marjalahti pallasite. In three crystals, the track distribution with a high density gradient was detected, which indicates a complicated radiation history of the meteorite.

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Bulletin of the Lebedev Physics Institute. 2019;46(8):251-255

251-255

(Eng)

(JATS XML)

Broadband Modulator Converting Infrared Radiation to Visible Light Based on Resonant Excitation of Surface Waves

Valyanskii S., Kononov M., Nedosekina I.

Аннотация

The fundamental possibility of developing one of the modulator circuits, i.e., the infrared-to-visible radiation converter, is considered, and its sensitivity is roughly estimated. The problem of visualization of infrared radiation is a relevant subject of study. The scheme of the light-controlled modulator we propose does not replicate any known scheme. Its operation is based on the effect of excitation of a surface plasmon wave.

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Bulletin of the Lebedev Physics Institute. 2019;46(8):256-258

256-258

(Eng)

(JATS XML)

Scintillation Properties of Oxyorthosilicate Crystals Gd₂SiO₅:Ce³⁺:Ca²⁺

Belov M., Zavartsev Y., Zavertyaev M., Zagumennyi A., Kozlov V., Kutovoi S., Pestovskii N., Savinov S.

Аннотация

Scintillation single crystals and polycrystals of gadolinium oxyorthosilicate Gd₂SiO₅: Ce³⁺,Ca²⁺ are grown by the Czochralski method. The effect of the doping ion concentration on pulsed cathodoluminescence spectra, light output, and scintillation time under gamma excitation is studied. It is shown that the scintillation time decreases with increasing both Ce³⁺ and Ca²⁺ ion concentrations.

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Bulletin of the Lebedev Physics Institute. 2019;46(8):259-262

259-262

(Eng)

(JATS XML)

Photon Distribution Function in Weakly Coupled Maxwellian Plasma

Maslov S., Bronin S., Gusein-zade N., Trigger S.

Аннотация

It is shown that the photon distribution for fully ionized plasma with weak interparticle interaction asymptotically corresponds to the Planck distribution at small photon momenta k. The number of photons decreases with increasing k in comparison with the Planck distribution. Calculation of the asymptotics for large k requires consideration of the interaction effects.

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Bulletin of the Lebedev Physics Institute. 2019;46(8):263-266

263-266

(Eng)

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AFM-MS for Protein Analysis of Plasma Samples of Patients with Ovarian Cancer

Kaysheva A., Pleshakova T., Malsagova K., Chingin K., Matiur R., Pronichev A., Nikitaev V., Ivanov E., Vasilyak L., Ziborov V., Ivanova N., Valueva A., Ivanov Y.

Аннотация

An atomic force microscope (AFM) is a molecular detector that allows the recording of individual proteins and protein complexes on the surface of an atomically flat substrate, the AFM chip. Registration of target proteins is carried out after the fishing procedure — catching out of proteins from the volume of the analyzed solution to a surface of a small area (sensory zone of the chip) modified by affinity reagents against the target protein. The use of the procedure of biospecific enrichment makes it possible to effectively concentrate the molecules of the target proteins in an amount sufficient for the subsequent mass spectrometric analysis for early diagnosis of ovarian cancer in blood samples.

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Bulletin of the Lebedev Physics Institute. 2019;46(8):267-271

267-271