Results 1 to 10 of about 999,597 (267)

MODERNIZATION OF THE KHARKIV MICROWAVE SPECTROMETER: CURRENT STATE [PDF]

Radio Physics and Radio Astronomy, 2023
Subject and Purpose. Results are presented of the recent considerable upgrade implemented at the Kharkiv microwave spectrometer. The upgrade has been aimed at extending the operating frequency range and increasing the utmost accessible spectral ...
E. A. Alekseev, V. V. Ilyushin, V. V. Budnikov, M. L. Pogrebnyak, L. B. Kniazkov   +4 more
doaj   +1 more source

On the Stark broadening of Ru III spectral lines [PDF]

Bulletin of Natural Sciences Research, 2021
Stark broadening parameters, full widths at half maximum (FWHM) and shifts for spectral lines within six multiplets of doubly charged ruthenium ions have been calculated, for an electron density of 10 17 cm-3 and temperature range from 10 000 K to 160 ...
Dimitrijevć Milan S.
doaj   +1 more source

SQUARE-WAVE FREQUENCY MODULATION IN MICROWAVE SPECTROSCOPY [PDF]

Radio Physics and Radio Astronomy, 2022
Subject and Purpose. The frequency modulation (FM)combined with lock-in detection, the technique which is used in microwave spectroscopy for enhancing the sensitivity of measurements, as well as the effects due to standing wavesinthe measuring absorption
E. A. Alekseev, V. V. Ilyushin, R. A. Motiyenko   +2 more
doaj   +1 more source

THE RT-32 RADIO TELESCOPE CONSTRUCTION BASED ON THE MARK-4B ANTENNA SYSTEM. 3. LOCAL OSCILLATORS AND SELF-NOISE OF THE RECEIVING SYSTEM [PDF]

Radio Physics and Radio Astronomy, 2020
Purpose: High resolution investigation of spectral lines of space sources requires low intrinsic noise of the radio telescope receiving system. It is provided with both input cryogenic amplifiers and low phase noise of local oscillators. To make spectral
O. M. Ulyanov , V. V. Zakharenko, E. A. Alekseev, O. M. Reznichenko, I. O. Kulahin, V. V. Budnikov , V. I. Prisiazhnii , A. V. Poikhalo, V. V. Voytyuk, V. N. Mamarev , V. V. Ozhinskyi, V. P. Vlasenko , V. M. Chmil , I. K. Sunduchkov, M. M. Berdar , V. I. Lebed, M. I. Palamar, A. V. Chaikovskii, Yu. V. Pasternak, M. A. Strembitskii, M. P. Natarov, S. O. Steshenko, V. V. Glamazdin, O. I. Shubnyi, A. O. Kyrylenko, D. Yu. Kulyk   +25 more
doaj   +1 more source

Update of Atomic Data for the First Three Spectra of Actinium

Atoms, 2022
The present article describes a complete reanalysis of all published data on observed spectral lines and energy levels of the first three spectra of actinium (Ac I–III). In Ac I, three previously determined energy levels have been rejected, 12 new energy
Alexander Kramida
doaj   +1 more source

Investigation and diagnostics of plasma flows in a pulsed plasma accelerator for experimental modelling of processes in tokamaks

Eurasian Journal of Physics and Functional Materials, 2021
This paper presents the experimental results on electron, ion temperatures and densities in a pulsed plasma accelerator. The values of electron densities and temperatures were computed using the methods of relative intensities of Hα and Hβ lines, Hβ ...
M. K. Dosbolayev, A. B. Tazhen, T. S. Ramazanov   +2 more
doaj   +1 more source

Project of the Large Solar Telescope with mirror 3 m in diameter

Solar-Terrestrial Physics, 2020
One of the most important problems of modern solar physics is the observation of the small-scale structure of the solar atmosphere at various heights (including the chromosphere and corona) in different spectral lines.
Grigoryev V.M., Demidov M.L., Kolobov D.Yu., Pulyaev V.A., Skomorovsky V.I., Chuprakov S.A.   +5 more
doaj   +1 more source

Surface-enhanced Raman spectroscopy reveals structure complexity difference in single extrapulmonary Mycobacterium tuberculosis bacteria with different drug resistance

Results in Physics, 2023
In this work, we argue that the SERS technique allows distinguishing between drug-sensitive and drug-resistant strains on the level of resolution of individual mycobacteria.
Anastasia I. Lavrova, Andrey Zyubin, Marine Z. Dogonadze, Evgenii V. Borisov, Ilya Samusev, Eugene B. Postnikov   +5 more
doaj   +1 more source

Intensity and Polarization of Radiation Emerging from Rotating Accretion Disc with Increasing Height

Universe, 2020
We consider the radiation emission in continuum and spectral lines from rotating accretion disc with the progressive increasing height. It is known that for the plane accretion disc with homogeneous atmosphere the wave electric field E is perpendicular ...
Nikolai Silant’ev, Galina Alekseeva, Yulia Ananjevskaja, Viktor Novikov   +3 more
doaj   +1 more source

Stark Broadening of N VI Spectral Lines

Universe, 2023
Stark broadening parameters, line widths and shifts, for 15 N VI multiplets are calculated using semiclassical perturbation theory for temperatures from 50,000 K to 2,000,000 K, and perturber density of 1016 cm−3. As perturbers have been taken electrons,
Milan S. Dimitrijević, Magdalena D. Christova, Sylvie Sahal-Bréchot   +2 more
doaj   +1 more source