123 results
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2. Response of total electron content to the October 25, 2022 partial solar eclipse from high to low latitudes in the Euro-Asian region.
- Author
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Chernogor, Leonid F., Mylovanov, Yurii B., and Zhdanko, Yevhen H.
- Subjects
- *
SOLAR eclipses , *GLOBAL Positioning System , *SPACE environment , *IONOSPHERIC disturbances , *ELECTRON density , *LATITUDE - Abstract
• For the first time, the ionospheric response to a solar eclipse was observed on a global scale. • Changes in all TEC disturbance parameters depended in a complex manner on relative obscuration area. • Delay time of maximum ionospheric response with respect to maximum eclipse magnitude was 15–25 min. • Duration of ionospheric response to the eclipse exceeded the duration of disturbing source influence. Solar eclipses (SEs) pertain to high-energy sources. They are capable of causing significant disturbances in all geoshells and geophysical fields. Despite the almost century-long history of studying the influence of eclipses on geoshells, the task of observing and analyzing disturbances in them remains relevant. This is explained by the fact that the response of the media significantly depends on the state of atmospheric and space weather, the location and time of observation, the SE magnitude, etc. The aim of this paper is to present the results of a statistical analysis of the features of the total electron content (TEC) variations during the October 25, 2022 SE from high to low latitudes in the Euro-Asian region. Data from Global Navigation Satellite System were used for the analysis. The error in estimating TEC in the vertical column did not exceed 0.1 TECU. For the first time, the response of the ionosphere to an SE has been studied on a global scale (from the Reykjavik station to the Novosibirsk station) using methods of statistical analysis, including the time moments after sunset. The decrease in TEC reached 1.0–19.0 TECU, and the relative decrease was approximately –0.32. Changes in all TEC disturbance parameters depended in a complex manner on the relative obscuration area of the solar disk. This can be explained by non-monotonic changes in electron density during the daytime, by the intensification of the ionosphere–plasmasphere coupling, the disturbance of the ionospheric current system, vertical plasma drift in crossed electric and magnetic fields, as well as the generation of wave disturbances during the SE period. The delay time of the maximum ionospheric response (maximum |δ V | value) with respect to the maximum magnitude of the eclipse was 15–25 min. The duration of the ionospheric response to the SE slightly exceeded the duration of the perturbing source influence. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
3. Effect of Forest Mosaic on the Functional Diversity of Earthworms (Oligochaeta, Lumbricidae) in the Forest-Steppe Belt of the Ob River Region (Novosibirsk Oblast).
- Author
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Ermolov, S. A.
- Subjects
EARTHWORMS ,LUMBRICIDAE ,OLIGOCHAETA ,POPULATION density - Abstract
This paper discusses earthworm (Lumbricidae) populations inhabiting forb–fern pine forests and fern birch–aspen forests prevailing in the forest-steppe belt of the Ob River region (Novosibirsk oblast) in relation to the forest mosaic. A detailed analysis of the structure of earthworm complexes has made it possible to identify individual species and living forms biotopically confined not only to certain forest types, but to forest microsites as well. Pine forests are mostly predominated by Asian earthworm species, while birch–aspen forests are mostly predominated by cosmopolitans. Differences between earthworm populations inhabiting various microsites in population density and biomass are more pronounced in forest openings than in undercrown and intercrown spaces, especially in pine forests. An analysis of earthworm populations inhabiting fallen deadwood has made it possible to identify distinctive features of their structure: in pine forests, incomplete deadwood earthworm complexes complement soil earthworm complexes; in birch–aspen forests, fallen deadwood represents a distinct microsite with a fully featured earthworm complex. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
4. IMPORTANT DEVELOPMENTS IN THE FIELDS OF CRYSTAL GROWTH AND REAL STRUCTURE OF NEARLY PERFECT SINGLE CRYSTALS.
- Author
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Lal, K.
- Subjects
CRYSTAL growth ,SINGLE crystals ,INORGANIC chemistry ,CRYSTAL lattices ,SPACE groups ,COOPERATIVE research ,RESEARCH & development projects - Abstract
This paper is a tribute to an internationally renowned scientist, Prof. Fedor A. Kuznetsov with several noteworthy contributions to his credit. He had played a key role in strengthening Indo-Russian collaboration in science and technology. The author had the privilege of actively pursuing several joint R&D projects. My laboratory had received an advanced Crystal Growth system developed at the Institute of Inorganic Chemistry, Novosibirsk. Several scientists of this institute had been our guests and published jointly authored research papers. Some results of important investigations carried out in author′s group are described. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
5. The effect of near‐surface azimuthal anisotropy on a joint interpretation of seismic and electrical resistivity data.
- Author
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Yaskevich, Sergey V., Dergach, Petr A., Chernyshov, Gleb S., Nevedrova, Nina N., Sanchaa, Aidisa, Shalaginov, Alexander E., Duchkov, Anton A., Gorshkalev, Sergey B., and Karsten, Wladimir
- Subjects
ANISOTROPY ,SEISMIC surveys ,ELECTRICAL resistivity ,MAGNETOTELLURICS ,ELECTRONIC data processing ,LEAD time (Supply chain management) - Abstract
In this paper, we study the anisotropic near surface with seismic refraction surveying and electrical resistivity tomography. We present a field data processing case study and show a significant dependence of the determined P‐ wave velocity and electrical resistivity on the acquisition line direction. We show that the anisotropy influences not only the determined velocities themselves, but also the estimated depths of the determined boundaries and can cause misinterpretation of the arrival time curves and lead to hidden layer issues. We justify our field data‐processing results with ray modelling and synthetic data processing. As a result of our case study, we suggest a consistent direction of anisotropy for electrical resistivity and seismic surveying for the particular site in the Novosibirsk region. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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6. Obtaining the Effective Dielectric Permittivity of a Conducting Surface in the Terahertz Range via the Characteristics of Surface Plasmon Polaritons.
- Author
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Gerasimov, Vasily Valerievich, Nikitin, Alexey Konstantinovich, Lemzyakov, Alexey Georgievich, Azarov, Ivan Aleksandrovich, and Kotelnikov, Igor Aleksandrovich
- Subjects
TERAHERTZ spectroscopy ,POLARITONS ,DIELECTRICS ,PERMITTIVITY ,MICHELSON interferometer ,OPTICAL constants ,FREE electron lasers ,PERMITTIVITY measurement ,DIELECTRIC loss - Abstract
Featured Application: Surface plasmon refractometry of conducting surfaces applied in terahertz plasmonic integrated circuits and communication lines. With the intensive development of data transmitting and processing devices in the terahertz (THz) frequency range, an important part of which are integrated plasmonic components and communication lines, it becomes necessary to measure correctly the optical constants of their conductive surfaces. In this paper, we describe a reliable method for determining the effective permittivity ε
m of a metal surface from the measured characteristics (refractive and absorption indices) of THz surface plasmon polaritons (SPPs). The novelty of the method is the conduction of measurements on a metal surface with a dielectric layer of subwavelength thickness, suppressing the radiative losses of SPPs, which are not taken into account by the SPP dispersion equation. The method is tested on a number of flat "gold sputtering–zinc sulfide layer–air" structures with the use of the THz radiation (λ0 = 141 μm) from the Novosibirsk free electron laser (NovoFEL). The SPP characteristics are determined from interferograms measured with a plasmon Michelson interferometer. It is found that the method allows a significant increase in the accuracy of the εm in comparison with measurements on the same metal surface without a dielectric layer. [ABSTRACT FROM AUTHOR]- Published
- 2023
- Full Text
- View/download PDF
7. Terahertz Bessel Beams Formed by Binary and Holographic Axicons.
- Author
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Knyazev, Boris, Osintseva, Natalya, Komlenok, Maxim, Pavelyev, Vladimir, Gerasimov, Vasily, Kameshkov, Oleg, Choporova, Yulia, and Tukmakov, Konstantin
- Subjects
BESSEL beams ,FREE electron lasers ,VECTOR beams ,HELICAL structure ,GAUSSIAN beams ,NUMERICAL calculations ,QUANTUM cascade lasers - Abstract
The characteristics of high-power vortex Bessel beams in the terahertz range ( λ = 141 μm) obtained with the use of diffractive axicons (DAs) illuminated by a Gaussian beam of the Novosibirsk free-electron laser were studied. Two of the three possible types of DA recently described in our previous paper, namely, binary spiral silicon axicons (BAs), forming beams with a topological charge l equal to 0–4 and 9, and a diamond "holographic" axicon (HA), forming a beam with l = 9 , were used in the experiments. These axicons formed beams whose cross sections in the region of inner Bessel rings were close to those of ideal Bessel beams, but their intensities varied in azimuth with a frequency of l and 2 l for the BAs and HA, respectively. However, in the case of the BAs, the beams had a pronounced helical structure at the periphery, whereas for the HA, the beam was axisymmetric. By focusing these beams with a lens, we studied the structure of the so-called "perfect" beams (PBs). While an ideal Bessel beam exhibits a PB as a thin ring, in the case of the BAs, we observed a broadened ring structure consisting of 2 l short spirals, and for the HA, we observed a narrow ring with 2 l maxima in azimuth. A comparison of the numerical calculations and experiments showed that the observed azimuthal intensity variations can be attributed to inaccuracies in the preparation of the axicon relief and/or discrepancies between the calculated and actual wavelengths, within a few percent. The results of this work enable the establishment of quality requirements for axicon manufacture and the appropriate selection of the axicon type in accordance with the requirements for the beam. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
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8. Planar Michelson Interferometer Using Terahertz Surface Plasmons.
- Author
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Gerasimov, V. V., Nikitin, A. K., and Lemzyakov, A. G.
- Subjects
SURFACE plasmons ,MICHELSON interferometer ,FREE electron lasers ,OPTICAL interferometers ,COHERENT radiation ,REFRACTIVE index ,INTERFEROMETERS - Abstract
The optical scheme and technical characteristics of terahertz planar Michelson interferometer based on surface plasmons are presented. A technique for determination of the complex index of refraction of surface plasmons () from interferograms is described. The paper presents the results of test measurements on flat surfaces with gold sputtering coated by ZnS layers 0 to 3 μm thick with application of the high-power coherent radiation from the Novosibirsk free electron laser at the wavelength λ
0 = 141 μm. From the measurement results, the value of the effective permittivity of the sputtered gold surface was found, which turned out to be an order of magnitude lower than that of crystalline gold. Analysis of the energy losses in the plasmonic interferometer made it possible to estimate its dynamic range (106 –108 in terms of radiation power) required for measurements on samples with different . Ways to increase the signal-to-noise ratio via optimization of the elements of the optical scheme and detector have also been proposed. [ABSTRACT FROM AUTHOR]- Published
- 2023
- Full Text
- View/download PDF
9. Diffraction of bessel beams on 2D amplitude gratings—a new branch in the talbot effect study.
- Author
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Kotelnikov, I A, Kameshkov, O E, and Knyazev, B A
- Subjects
BESSEL beams ,FREE electron lasers ,POLARITONS ,LAGUERRE-Gaussian beams ,DIFFRACTION patterns ,MICROELECTROMECHANICAL systems ,FIREPLACES - Abstract
In this paper, an analytical theory for the diffraction of a Bessel beam of arbitrary order J
l (κr) on a 2D amplitude grating is presented. The diffraction pattern behind the grating turned out to be more complicated in comparison with the classical Talbot effect observed under illumination by a plane wave. In particular, the patterns in the main and fractional Talbot planes under certain conditions that are found in the article, are lattices of ring microbeams, the diameters of which depend on the period of the grating, the diameter of the illuminating beam, the number of the Talbot plane, and the topological charge l. For the rings near the optical axis, the latter reproduces l of the illuminating beam. The diffraction patterns observed in experiments on the Novosibirsk free electron laser behind gratings with periods of 1 to 6 mm, illuminated by zero- to second-order Bessel beams at a radiation wavelength λ = 141 µm, are in good agreement with both theoretical predictions and numerical calculations. We emphasize that an analytical theory based on the scalar theory of diffraction perfectly describes resulting diffraction patterns with hole diameters down to 0.25 mm, which are less than 2λ, when, formally speaking, the scalar theory becomes incorrect. Since the Laguerre–Gaussian beams can be represented as a superposition of Bessel beams, results of this paper can be applied to analysis of the Talbot effect with the Laguerre–Gaussian beams. A regular lattice of ring-like vortex microbeams, which can be formed in the Talbot planes, can be applied, for example, to creation of a lattice of optical traps, transmission of orbital angular momentum to elements of micromechanical devices, and to launching surface plasmon polaritons on an array of metal wires by 'the end-fire coupling technique'. [ABSTRACT FROM AUTHOR]- Published
- 2020
- Full Text
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10. Methods for research the dynamic effect of the trams on bridge structures.
- Author
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Yashnov, Andrey, Ivanov, Evgeny, Khegai, Julia, and Khamidullina, Natalya
- Subjects
STRUCTURAL engineering ,RAILROADS ,RESEARCH methodology ,ROLLING stock ,BRIDGES - Abstract
The research paper is devoted to the study of the practical dynamic impact of the tram rolling stock on city bridges. The authors analyzed the current state and prospects for the tram rail lines' development in conjunction with bridge crossings in Novosibirsk and Rostov-on-Don. It is considered the requirements for the dynamic impact accounting of the tram traffic specified in domestic and foreign regulatory documents. Using a mobile measuring complex, which includes accelerometer sensors, an experiment was carried out, and according to the obtained results the natural frequencies of vertical, horizontal transverse and horizontal longitudinal vibrations of the 71-619K and 71-605 tram cars were determined. The technique used in the experiment makes it possible to obtain the initial data for the dynamic calculation of structures for the tram traffic, to clarify the real dynamics of the rolling stock, depending on the state of the rail track on the bridge. The data obtained can be used in vibration diagnostics when assessing the state of an engineering structure. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
11. Seismological Observations during a Landslide on the Dump at the Kolyvan Anthracite Deposit (Novosibirsk Region).
- Author
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Seleznev, V. S., Liseikin, A. V., Emanov, A. F., and Solov'ev, V. M.
- Subjects
LANDSLIDES ,REMOTE-sensing images ,FREQUENCIES of oscillating systems ,DATA analysis - Abstract
This paper reports the results of satellite image and seismological data analysis obtained when considering the causes of a landslide on the Yelbashinskii dump at the Kolyvan anthracite deposit. The potential for determining the natural vibrations of large objects from low-frequency seismological records and monitoring thereof has been demonstrated. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
12. Evaluation of Some Parameters of the Topsoil from Radar and Optical Data of Sentinel 1/2 Satellites Using the Example of the Novosibirsk Region.
- Author
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Rodionova, N. V., Kudryashova, S. Ya., and Chumbaev, A. S.
- Subjects
OPTICAL radar ,CHERNOZEM soils ,TOPSOIL ,CLAY soils ,REMOTE-sensing images ,FOREST soils ,REFLECTANCE - Abstract
This paper considers the use of radar and optical data from the Sentinel 1 and Sentinel 2 satellites for 2019–2020 to assess the humus content and the percentage of clay and moisture in the topsoil using the example of chernozems and gray forest soils of the Novosibirsk oblast. Particular attention is paid to the selection of satellite images, because in order to quantify the humus content and clay in the soil, it is necessary to fulfill the conditions for the soil to be dry and bare. The humus content is estimated for five test sites based on a regression model (Karavanova and Orlov, 1996), which includes surface reflection coefficients at the wavelength of the B6 spectral channel of the Sentinel 2 satellite. The model parameters are adjusted for the conditions of the study area separately for chernozems and gray forest soils. The percentage of physical clay in the soil is estimated using Sentinel 2 optical data, ground measurements, and regression models with an exponential dependence of clay content on soil reflectances at the SWIR wavelengths of the Sentinel 2 spectral channels (Bousbih et al., 2019; Shabou et al., 2015). The change in the percentage of humus and clay content in the test sites of soils over the year is shown according to Sentinel 2 data. The topsoil moisture content is estimated based on radar, optical, and the combined use of radar and optical data. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
13. THE CURRENT STATE OF AND PROSPECTS FOR THE DEVELOPMENT OF GRAIN PRODUCTION IN SIBERIAN FEDERAL DISTRICT.
- Author
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STADNIK, Anatoly T., CHERNOVA, Svetlana G., DENISOV, Denis A., CHERNOV, Semen V., VAKHNEVICH, Konstantin E., and YAKIMOVA, Lyudmila A.
- Subjects
GRAIN development ,GRAIN farming ,AGRICULTURAL productivity ,LIVESTOCK farms ,GRAIN as feed ,GRAIN trade - Abstract
Siberian Federal District (SFD) is located in the center of the Russian Federation, occupying 30% of its territory. Its population is 19,326 thousand people, which constitutes 13.2% of Russia's total population. The district consists of 12 constituent entities, which, to one degree or another, are engaged in agricultural production. Grain crops are grown in each of the SFD regions, with the way being currently led by Altai Krai, Krasnoyarsk Krai, Omsk Oblast, Kemerovo Oblast, and Novosibirsk Oblast, which account for 90% of the district's gross grain output. Most of the district's land under cultivation is sown to wheat (67%). However, due to unstable and low prices for wheat, agriproducers are forced to consider dropping some of the traditional crops and shifting, in accordance with the changing needs of the market, to other - sought-after and more competitive - grain crops. Another major issue in grain production within the district is the relatively low quality of grain, which diminishes its competitiveness in the market, with nearly 60% of all grain being represented by low-protein feeding grain. It may, therefore, be advantageous for Siberian agriculturists to grow grain for livestock farming, and this may require enhancing the actual structure of the land under cultivation and focusing on growing grain crops with the protein component greater than in the 4th class soft wheat. The paper shares some of the findings from an assessment of the region's agro-climatic potential for the period through to 2025. [ABSTRACT FROM AUTHOR]
- Published
- 2019
14. Simulation and experimental study of beam dynamics in NovoFEL RF gun and its beamline.
- Author
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Matveev, Anton, Davidyuk, Igor, Shevchenko, Oleg, Tcheskidov, Vladimir, Vinokurov, Nikolay, Volkov, Vladimir, and Knyazev, Boris
- Subjects
BEAM dynamics ,NUCLEAR physics ,FIREARMS ,INJECTORS - Abstract
A new normal-conducting, CW, thermocathode RF gun has been developed and tested recently at Budker Institute of Nuclear Physics. Providing an average current of up to 100 mA, this device will be used to upgrade the injector of the Novosibirsk FEL facility. Simulation of beam dynamics in the RF gun and its beamline was performed, the space-charge forces taken into account. Comparison of the simulation results and experimental measurements is presented in this paper. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
15. 14C IN TREE RINGS IN THE VICINITY OF THE RBMK REACTOR NUCLEAR POWER PLANT.
- Author
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Nazarov, Evgeniy I, Kruzhalov, Alexander V, Vasyanovich, Maxim E, Ekidin, Alexey A, Pyshkina, Maria D, Kukarskikh, Vladimir V, and Parkhomchuk, Ekaterina V
- Subjects
TREE-rings ,NUCLEAR reactors ,NUCLEAR power plants ,NUCLEAR physics ,FOOD consumption ,CARBON isotopes - Abstract
The paper presents the results of radiocarbon (
14 C) concentration measurements in tree rings in the vicinity of Kursk NPP (Russia) with four operating RBMK reactors. The sampling was carried out from the site with the highest expected accumulation of radiocarbon in vegetation. The site was determined with long-term meteorological data. The measurements of14 C concentration carried out with accelerator-mass spectrometer in Budker Institute of Nuclear Physics, Novosibirsk, Russia. The obtained results demonstrated the influence of exploitation of Kursk NPP to the concentration of14 C in tree rings. Based on the equilibrium between the14 C ratio in the tree rings and the surrounding air, retrospective estimates of the radiocarbon discharge and effective doses were made. Effective doses were calculated with two approaches: IAEA methodology and less conservative approach, considering the real food consumption in the Kursk region. The values of calculated doses by the second method (0.08–2.58 μSv) are more than 2 times less than IAEA approach (0.17–5.30 μSv). The highest difference between measured and background14 C in tree ring is 41.7 ± 5.8 pMC in 2014 during the restoration of graphite stack. The main contribution to14 С exposure in the considering period is caused by background – from 70 to 99%. [ABSTRACT FROM AUTHOR]- Published
- 2023
- Full Text
- View/download PDF
16. Assessment of oil pollution of Lake Chany (Novosibirsk region).
- Author
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El'chaninova, Elena A., Strel'nikova, Evgenia B., Russkikh, Irina V., and Fyodorov, Denis V.
- Subjects
WATER pollution ,CARBON content of water ,GAS chromatography/Mass spectrometry (GC-MS) ,LAKE sediments ,PLASTICIZERS ,AROMATIC compounds - Abstract
The paper presents the results of an investigation of the composition of organic matter in water and bottom sediments of Lake Chany (Novosibirsk region). A wide range of lipid biomarkers (acyclic, aromatic and naphthenic hydrocarbons, acyclic and alicyclic oxygenated organics) have been identified by gas chromatography-mass spectrometry. The main bioproducers and environmental conditions leading to the dominance of individual representatives of the biota have been determined. The presence of oil steranes, alkanes, and cyclohexanes in the lake water suggests the presence of motorboat diesel fuel in the water. Compounds for household use—triphenyl phosphates and phthalates—have been identified, which are used as plasticizers in the production of polymer materials. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
17. Modeling Epidemics: Neural Network Based on Data and SIR-Model.
- Author
-
Krivorotko, O. I., Zyatkov, N. Yu., and Kabanikhin, S. I.
- Subjects
- *
CONVOLUTIONAL neural networks , *RECURRENT neural networks , *ELECTRONIC data processing , *INVERSE problems , *SARS-CoV-2 Omicron variant - Abstract
Earlier, a method for constructing an initial approximation for solving the inverse problem of acoustics by a gradient method based on a convolutional neural network trained to predict the distribution of velocities in a medium from wave response was proposed [9]. It was shown that the neural network trained on responses from simple layered media can be successfully used for solving the inverse problem for a significantly more complex model. In this paper, we present algorithms for processing data about epidemics and an example of applying a neural network for modeling the propagation of COVID-19 in Novosibirsk region (Russia) based only on data. A neural network NN-COVID-19 that uses data about the epidemics is constructed. It is shown that this neural network predicts the propagation of COVID-19 for five days by an order of magnitude better than SEIR-HCD. When a new variant (Omicron) appeared, this neural network was able to predict (after retraining) the propagation of the epidemics more accurately. Note that the proposed neural network uses not only epidemiological data but also social ones (such as holidays, restrictive measures, etc.). The proposed approach makes it possible to refine mathematical models. A comparison of the curves constructed by SEIR-HCD model and by the neural network shows that the plots of solutions of the direct problem almost coincide with the plots constructed by the neural network. This helps refine coefficients of the differential model. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
18. BGRS: bioinformatics of genome regulation and data integration.
- Author
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Orlov, Yuriy L., Chen, Ming, Kolchanov, Nikolay A., and Hofestädt, Ralf
- Subjects
DATA integration ,DATA protection ,GENETIC regulation ,SYSTEMS biology ,COMPUTATIONAL biology ,COMPUTATIONAL neuroscience - Abstract
The Journal of Integrative Bioinformatics has published a document titled "BGRS: bioinformatics of genome regulation and data integration." The document discusses the importance of gene expression regulation in bioinformatics development and highlights the databases and tools that have been developed for studying transcription factor regulation. The document also reviews current trends in bioinformatics of gene expression based on the material discussed at the BGRS\\SB conference held in Novosibirsk. The conference covers various topics including genomics, transcriptomics, systems biology, and computational plant biology. The document emphasizes the need for collaboration in bioinformatics research and mentions emerging topics such as COVID-19 studies and Big Data in medicine. The next BGRS meeting is scheduled for 2024. [Extracted from the article]
- Published
- 2023
- Full Text
- View/download PDF
19. A Project for a Compton Photon Source with an Energy up to 2500 MeV at the SKIF Synchrotron Radiation Facility.
- Author
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Kaminskiy, V. V., Meshkov, O. I., and Muchnoi, N. Yu.
- Subjects
PHOTONUCLEAR reactions ,PHOTON flux ,POLARIZED photons ,PHOTONS ,LASER beams ,SUPERCONDUCTING quantum interference devices ,SYNCHROTRON radiation - Abstract
In this paper, we describe the project of a photon source with energies up to 2500 MeV at the SKIF synchrotron radiation facility (under construction in Novosibirsk). It is intended for experiments on photonuclear reactions, nonlinear QED, EM detector calibration and other applications. A polarized photon beam with a flux of 10
6 –108 Hz (in full spectrum) is produced using Compton backscattering (or inverse scattering) of IR, visible, and UV laser radiation, as well as the UV band of its own synchrotron radiation, on the SKIF electron beam (15 kHz). Spectrum monochromatization with collimators or/and tagging system by recoil electrons is possible. The discrepancy between experimental and theoretical photofission cross sections of actinide nuclei in a photon energy range of hundreds of MeV has been known since the 1980s, so it is proposed to study these cross sections in the first series of experiments. [ABSTRACT FROM AUTHOR]- Published
- 2021
- Full Text
- View/download PDF
20. A 10 mA, steady-state, charge exchange negative ion beam source.
- Author
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Shikhovtsev, I., Amirov, V., Anikeeva, K., Davydenko, V., Emelev, I., Ivanov, A., Mishagin, V., Rashchenko, V., Maslakov, I., and Shubin, E.
- Subjects
ANIONS ,CHARGE exchange ,ION sources ,ION beams ,IONS ,COLLISION induced dissociation ,BORON-neutron capture therapy ,PLASMA beam injection heating - Abstract
A negative ion source, which utilizes a conversion of primary high current proton beam into negative ions in a gas target via charge-exchange collisions, is under development in Budker Institute, Novosibirsk. The proposed beam will be used for injection into a tandem accelerator, which is a part of the neutron source dedicated for boron-neutron capture therapy (BNCT). The ion source is designed to produce a beam that contains ≥50% of molecular ions. The initial ion beam current is about 1 A at 30 keV energy. After molecular ion dissociation in a gas target, which produces protons with an energy of 15 keV, and further charge-exchange collisions, the beam after the target will contain about 2% of negative ion species with a current in excess of 10 mA. The negative ion beam is then separated by the magnetic field, accelerated up to an energy of 105 keV and enters the tandem accelerator. This paper presents the results of simulations of the beam formation, acceleration and transport. The arrangement of the ion source and corresponding high voltage power supply are also discussed. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
21. Planar Graphs Without Adjacent Cycles of Length at Most Five are (2, 0, 0)-Colorable.
- Author
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Li, Xiangwen, Shen, Qin, and Tian, Fanyu
- Subjects
PLANAR graphs ,MATHEMATICS - Abstract
A graph G is (d 1 , d 2 , ... , d k) -colorable if the vertex set of G can be partitioned into subsets V 1 , V 2 , ... , V k such that the subgraph G [ V i ] induced by V i has maximum degree at most d i for i = 1 , 2 , ... , k . Novosibirsk's Conjecture (Sib lektron Mat Izv 3:428–440, 2006) says that every planar graph without 3-cycles adjacent to cycles of length 3 or 5 is 3-colorable. Borodin et al. (Discrete Math 310: 167–173, 2010) asked whether every planar graph without adjacent cycles of length at most 5 is 3-colorable. Cohen-Addad et al. (J Comb Theory Ser B 122:452–456, 2017) gave a negative answer to both Novosibirsk's conjecture and Borodin et al.'s problem. Zhang et al. (Discrete Math 339:3032–3042, 2016) asked whether every planar graph without adjacent cycles of length at most 5 is (1, 0, 0)-colorable. In this paper, we show that every planar graph without adjacent cycles of length at most five is (2, 0, 0)-colorable, which improves the result of Chen et al. (Discrete Math 339:886–905, 2016) who proved that every planar graph without cycles of length 4 and 5 is (2, 0, 0)-colorable. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
22. A concept of 1-2 "structural diagnostics" diffraction beamline for "SKIF" synchrotron radiation facility.
- Author
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Zakharov, B., Vinokurov, Z., Rashchenko, S., Shmakov, A., Boldyreva, E., Gromilov, S., Sukhikh, A., Komarov, V., Larichev, Yu., Tsybulya, S., Semerikova, A., Trebushinin, A., Zubavichus, Y., Rakshun, Ia., Knyazev, Boris, and Vinokurov, Nikolay
- Subjects
X-ray powder diffraction ,RAY tracing ,SYNCHROTRON radiation ,X-ray diffraction ,CONCEPTUAL design - Abstract
A conceptual design of the "Structural Diagnostics" diffraction beamline 1-2 for "SKIF" synchrotron radiation facility (Koltsovo, Novosibirsk area, Russia) is presented. The beamline will be dedicated to various diffraction techniques (powder X-ray diffraction, single-crystal X-ray diffraction and SAXS). All the techniques will be implemented in in situ and operando modes to enable real-time monitoring of chemical, physical, or engineering processes. The paper describes scientific scope of the beamline, basic X-ray optical scheme and equipment that will be available at the end-stations. Results of simulations and ray tracing aimed at the optimization of the instrumental resolution and flux are also given. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
23. Measurements of magnetic field of variable period undulator and correction of field errors.
- Author
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Gorbachev, Yaroslav, Davidyuk, Igor, Serednyakov, Stanislav, Vinokurov, Nikolay, Tcheskidov, Vladimir, Pavlenko, Anton, Batrakov, Alexandr, Shtro, Konstantin, Shevchenko, Oleg, and Knyazev, Boris
- Subjects
MAGNETIC field measurements ,CODING theory ,SUPERCONDUCTING magnets ,MAGNETS ,COINTEGRATION - Abstract
A new variable period undulator of unique design was developed and built recently at Budker INP. It will replace the electromagnetic undulator in use now on the second FEL of the Novosibirsk FEL facility. As a result, the FEL tunability range will be substantially extended. In this paper, we present the results of measurements of the undulator magnetic field for different periods and discuss ways to reduce the field errors, which include sorting of magnets, weakening of undulator edge poles, and using of steering coils. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
24. The Novosibirsk free electron laser facility.
- Author
-
Shevchenko, O. A., Vinokurov, N. A., Arbuzov, V. S., Chernov, K. N., Deichuly, O. I., Dementyev, E. N., Dovzhenko, B. A., Getmanov, Ya. V., Gorbachev, Ya. I., Knyazev, B. A., Kondakov, A. A., Kozak, V. R., Kozyrev, E. V., Krutikhin, S. A., Kubarev, V. V., Kulipanov, G. N., Kuper, E. A., Kuptsov, I. V., Kurkin, G. Ya., and Medvedev, L. E.
- Subjects
FREE electron lasers ,SUBMILLIMETER waves ,ELECTRON beams - Abstract
The Novosibirsk FEL facility includes three FELs operating in the terahertz, far-, and mid- infrared spectral ranges. It has rather long history, but its potential has not been fully revealed so far. The first FEL of this facility has been operating for users of terahertz radiation since 2004. It remains the world's most powerful sources of coherent narrow- band radiation in its wavelength range (90 – 340 µm). The second FEL was commissioned in 2009. Now it operates in the range of 35 – 80 µm, but we plan to replace its undulator soon with a new one, and its short wavelength boundary will be shifted down to 15 µm. The third FEL was commissioned in 2015 to cover the wavelength range of 5 – 20 µm. Its undulator comprises three separate sections. Such lattice is suited very well to demonstrate the new off-mirror way of radiation outcoupling in an FEL oscillator (so called electron outcoupling), which we also plan for near future. We also intend to improve the accelerator injection system. As a result, the average electron beam current and consequently the radiation power of all the three FELs will increase. In this paper, we present an overview of the facility and discuss our recent achievements and future plans. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
25. MITO E TRADIZIONE NEL TEATRO DI NINA SADUR La realtà dell'assurdo e l'assurdo della realtà.
- Author
-
SHYLNIKOVA, IRYNA
- Subjects
RUSSIAN literature ,SCREENWRITERS ,GOOD & evil ,CHRISTIANS ,AUTHORS ,PSYCHOLOGICAL literature - Abstract
This paper examines the theatre work of Nina Vladimirovna Sadur (Novosibirsk, October 15th, 1950), Russian writer, playwriter and screenwriter, whose artistic world reflects mythological, folkloric and Christian traditions. The analysis aims to focus, through a general examination, on the mostly recurrent themes also in the light of a re-elaboration of the classics of Russian literature: the evil of living in its various manifestations, the antinomy Good-Evil, the clash between the real and the unreal, the socio-psychological discomfort. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
26. INTRODUCTORY NOTE FOR BGRS-2012 SPECIAL ISSUE.
- Author
-
Kolchanov, Nikolay A. and Orlov, Yuriy L.
- Subjects
SPECIAL issues of periodicals ,BIOINFORMATICS ,COMPUTATIONAL biology ,SYSTEMS biology ,NUCLEOTIDE sequence ,TRANSCRIPTION factors ,CONFERENCES & conventions - Published
- 2013
- Full Text
- View/download PDF
27. Genetic Diversity of the Human Adenovirus C Isolated from Hospitalized Children in Russia (2019–2022).
- Author
-
Kurskaya, Olga G., Prokopyeva, Elena A., Dubovitskiy, Nikita A., Solomatina, Mariya V., Sobolev, Ivan A., Derko, Anastasiya A., Nokhova, Alina R., Anoshina, Angelika V., Leonova, Natalya V., Simkina, Olga A., Komissarova, Tatyana V., Tupikin, Alexey E., Kabilov, Marsel R., Shestopalov, Alexander M., and Sharshov, Kirill A.
- Subjects
HOSPITAL care of children ,HUMAN genetic variation ,RESPIRATORY syncytial virus ,ADENOVIRUSES ,VIRUS diseases ,INFLUENZA B virus ,PARAINFLUENZA viruses - Abstract
The human adenovirus (HAdV) is a common pathogen in children that can cause acute respiratory virus infection (ARVI). However, the molecular epidemiological and clinical information relating to HAdV among hospitalized children with ARVI is rarely reported in Russia. A 4-year longitudinal (2019–2022) study among hospitalized children (0–17 years old) with ARVI in Novosibirsk, Russia, was conducted to evaluate the epidemiological and molecular characteristics of HAdV. Statistically significant differences in the detection rates of epidemiological and virological data of all positive viral detections of HAdV were analyzed using a two-tailed Chi-square test. The incidence of HAdV and other respiratory viruses such as human influenza A and B viruses, respiratory syncytial virus, coronavirus, parainfluenza virus, metapneumovirus, rhinovirus, bocavirus, and SARS-CoV-2 was investigated among 3190 hospitalized children using real-time polymerase chain reaction. At least one of these respiratory viruses was detected in 74.4% of hospitalized cases, among which HAdV accounted for 4%. A total of 1.3% co-infections with HAdV were also registered. We obtained full-genome sequences of 12 HAdVs, which were isolated in cell cultures. Genetic analysis revealed the circulation of adenovirus of genotypes C1, C2, C5, C89, and 108 among hospitalized children in the period from 2019–2022. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
28. Recent progress in modeling solid propellant combustion.
- Author
-
Beckstead, M. W.
- Subjects
SOLID propellants ,COMBUSTION ,CHEMICAL kinetics ,HYDROCARBONS ,MATHEMATICAL models - Abstract
Tremendous progress has been achieved in the last ten years with respect to modeling the combustion of solid propellants. The vastly increased performance of computing capabilities has allowed utilization of calculation approaches that were previously only conceptual. The paper will discuss three areas of emphasis: first, numerical modeling of premixed flames using detailed kinetic mechanisms; second, development of packing models to calculate a geometrical distribution of particles simulating a heterogeneous solid propellant; and finally, calculation of diffusion same effects that are critical in the combustion of AP/hydrocarbon solid propellants. The capability of modeling premixed combustion using detailed kinetic mechanisms has been evolving and successfully applied to solid propellant ingredients based on a one-dimensional approach. Much of the early work was performed at Novosibirsk. The approach allows calculating the burning rate as a function of pressure but also the temperature sensitivity and spatial distributions of temperature and species concentrations. Generalized mechanisms have been developed and applied to many ingredients such as HMX, GAP, RDX, NG, AP, etc. The gas-phase kinetic mechanisms seem to represent the chemistry of these monopropellants and pseudo-propellants consistently well. The burning rates of these monopropellants vary by almost an order of magnitude but are essentially independent of the flame temperature. Various model calculations agree reasonably well with available experimental data. Recent work in the USA has been aimed at describing the geometrical packing of a solid propellant. These models represent significant progress toward such a description. Combining the packing model with a realistic flame model is still a significant challenge. Preliminary results are encouraging, but obviously further work is needed. Also, fundamental calculation of two-dimensional diffusion flames, incorporating realistic kinetics has progressed significantly. Recent results show encouraging promise toward simulating the minute detail involved in determining the burning rates of AP containing propellants. [ABSTRACT FROM AUTHOR]
- Published
- 2006
- Full Text
- View/download PDF
29. Report on the Ninth Annual Conference of the Russian Library Association in Novosibirsk.
- Author
-
Dzhigo, Aleksandr Aleksandrovich
- Subjects
CONFERENCES & conventions ,SPECIAL events ,ASSOCIATIONS, institutions, etc. ,LIBRARIES ,BOOKS ,LIBRARY materials ,INFORMATION resources - Abstract
The paper summarizes the ninth annual conference of the Russian Library Association in May 2004. Included are the exhibits, several plenary addresses, the work of the Bibliography Section, and election results. [ABSTRACT FROM AUTHOR]
- Published
- 2005
- Full Text
- View/download PDF
30. Studies of High-Current Relativistic Electron Beam Interaction with Gas and Plasma in Novosibirsk.
- Author
-
Sinitsky, S. L., Arzhannikov, A. V., and Burdakov, A. V.
- Subjects
RELATIVISTIC electron beams ,MAGNETIC traps ,THERMONUCLEAR fusion ,PLASMA physics - Abstract
This paper presents an overview of the studies on the interaction of a high-power relativistic electron beam (REB) with dense plasma confined in a long open magnetic trap. The main goal of this research is to achieve plasma parameters close to those required for thermonuclear fusion burning. The experimental studies were carried over the course of four decades on various devices: INAR, GOL, INAR-2, GOL-M, and GOL-3 (Budker Institute of Nuclear Physics) for a wide range of beam and plasma parameters. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
31. ANXIETY IN A FOREIGN LANGUAGE PRONUNCIATION CLASS IN A UNIVERSITY SETTING.
- Author
-
Khoroshilova, Svetlana
- Subjects
FOREIGN language education in universities & colleges ,STUDY & teaching of phonetics ,PRONUNCIATION -- Study & teaching ,COLLEGE student attitudes ,PSYCHOLINGUISTICS ,ANXIETY - Abstract
The paper presents the results of the research conducted at the faculty of foreign languages at Novosibirsk State Pedagogical University to learn the emotions of students evoked by different tasks performed during a phonetics class and investigates what can make a course of foreign language pronunciation less anxiety-generating. The source of data was learners' reactions and opinions on particular tasks they were involved in during phonetics classes. The author shares a few ideas on how the teacher can reduce the anxiety load during pronunciation classes. Although the students majoring in English at the pedagogical university are already linguistically advanced and highly motivated to achieve native-like pronunciation, some of them appear not to benefit much from phonetics classes, making very little progress in the pronunciation aspect. The cause of taking limited advantage might be language anxiety accompanying a language pronunciation class. A study was conducted among 38 third-year students of the faculty of foreign languages who had already taken a two-year phonetics course at the university by the time of the experiment. The method used in the research was a questionnaire study where the learners specified their level of anxiety on a Likert scale from 0 (indicated 'no anxiety') to 5 ('very high anxiety') next to each activity of the lesson. The participants were also asked to fill out reflection sheets to share their feelings and opinions about each task. Opinions and reflections of the learners participating in the present research showed that the most anxiety-provoking tasks presupposed theoretical knowledge, straight-forward assessment and performing in front of the others. It seems that one of the ways of lowering the anxiety level experienced by learners during a phonetics class can be ensuring that the student's ego will not be endangered during the lesson. The tasks during which the students feel most secure and claim to be able to focus on real practice are those performed in pairs and groups. Needless to say, it is also the teaching style, manner of providing feedback and correcting errors that determine classroom dynamics. What seems important is adjusting the classroom activities and pace of work to the learners' level, and thus allowing them to succeed. Finally, the learner should be shown how anxiety can be lowered and encouraged to search for strategies that for him/her are the most effective. [ABSTRACT FROM AUTHOR]
- Published
- 2016
32. Determination of the price for a hydro resource with consideration of operating conditions of hydropower plants using complex criteria of profit maxmization.
- Author
-
Myatezh, T. V. and Sekretarev, Y. A.
- Subjects
WATER power ,WATER use ,ELECTRIC power production ,ELECTRICITY pricing ,ELECTRIC power consumption - Abstract
In this paper, a universal method has been developed to determine the price of a hydro resource (one cubic meter) for the operational regulation of a hydropower plant (HPP), which is a combination of an optimization method and a method for assessing the marginal utility. The proposed approach is based on the correct representation of differential incremental rate characteristics of water at an HPP and fuel at a thermal power plant (TPP). To know the price of a hydro resource used for electricity generation at a hydropower plant. This gives the possibility to increase the efficiency of management both at a hydropower plant, and in a water utilization system as a whole. Using the examples of Novosibirsk HPP, it is expected to develop an estimation of economic effect from the implementation of the developed criteria, the proposed method of the calculation of a hydro resource price at HPP, and the method of separating fuel costs at CHPP. As a result of the implementation the developed method for the HPP, a price of electricity sold in the flexible energy market will be compared to the price of the electricity produced and sold at CHPP, being equal to approximately 330 rubles/MW h. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
33. Techniques for generation of annular surface plasmon polaritons with refractive binary and reflective cylindrical diffraction gratings.
- Author
-
Knyazev, B. A., Choporova, Yu. Yu., Gerasimov, V. V., Kameshkov, O. E., Khasanov, I. Sh., Krasnopevtsev, S. E., Nikitin, A. K., Osintseva, N. D., Pavelyev, V. S., Tukmakov, K. N., Reshetnikov, A. S., Knyazev, Boris, and Vinokurov, Nikolay
- Subjects
- *
DIFFRACTION gratings , *POLARITONS , *FREE electron lasers , *ANGULAR momentum (Mechanics) , *REFLECTIVE learning - Abstract
The propagation length of surface plasmon polaritons (SPPs) increases with wavelength, which makes it possible to use radiation from the far-infrared and terahertz ranges to create communication devices employing SPPs as carriers of information. In this paper, we consider methods for implementing the multiplex transmission of information along cylindrical conductors using a combination of SPPs with orbital angular momentum and present experimental setups for the experiments on the Novosibirsk free electron laser. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
34. The relationship between physical performance and alcohol consumption levels in Russian adults.
- Author
-
Mitkin, Nikita A., Kirilkin, German E., Unguryanu, Tatiana N., Malyutina, Sofia, Cook, Sarah, and Kudryavtsev, Alexander V.
- Subjects
PHYSICAL mobility ,ALCOHOL drinking ,RUSSIANS ,DRINKING behavior ,ALCOHOL ,GRIP strength - Abstract
Investigating the relationship between alcohol consumption and physical performance, we used data from the 2015–2018 Know Your Heart study on 4215 adults aged 35–69 from Arkhangelsk and Novosibirsk, Russia. We classified participants' drinking status into non-drinking, non-problem drinking, hazardous drinking, and harmful drinking based on their self-reported drinking behaviors. To evaluate physical performance, we developed a Composite Physical Performance Scale (CPPS), which combined the results of three functional tests: grip strength (GS), closed-eyes balance, and chair rises (CR). We applied multivariable linear regression to assess the relationship between alcohol consumption and CPPS score, and ordinal logistic regression to explore the associations between alcohol consumption and the three functional tests separately. The results showed that harmful drinking was associated with lower CPPS scores compared to non-problem drinking. Among harmful drinking men, the decrease in CPPS scores was explained by all three tests equally and exceptionally by GS among women. Non-drinking was also associated with decreased CPPS, linked to lower GS and CR scores in men, and only lower GS scores in women. The study revealed a reduced physical performance in the non-drinking and harmful drinking groups compared to non-problem drinking. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
35. Computational Fluid Dynamics in Europe, a Personal View.
- Author
-
Napolitano, M.
- Subjects
- *
COMPUTATIONAL fluid dynamics , *FINITE differences , *FINITE element method , *HIGH-order derivatives (Mathematics) , *LARGE eddy simulation models , *MATHEMATICAL models of turbulence - Abstract
This review paper describes some major contributions provided by European scientists to the development of CFD from the early 70s to the end of the 20th century. Particular attention has been paid to those authors who have contributed to the success of the ICNMFD, started in 1969 (Novosibirsk) from a joint effort of scientists involved in the space race in the USA and the USSR,and of the ISCFD,started in 1995 (Tokyo) as a Pacific competitor to the ICNMFD. These two very important biennial international conferences have then merged into the ICCFD,starting from the year 2000,thanks to the efforts of the two scientific committees, promoted by prof. Oshima and the author. The majority of the authors whose work is the subject of this paper have been members of one or more of the Scientific Committees of the three aforementioned conferences, usually after having been selected to provide invited lectures to the same. Their choice is the sole responsibility of the author and is certainly incomplete and biased towards more applied, rather than theoretical CFD. Also,they are often personal friends of the author who has been a member of the CFD community for 40 years. Thus, this paper does not consider younger scientists, independently of the value of their contributions. Moreover,it is noteworthy that European CFD has always been strictly interconnected with US CFD. Some of the authors have started their careers in Europe and are now living and working in the USA (e. g., Glowinski,Roe, Van Leer); others have obtained their Ph. D. in the USA (e. g., Launder, Napolitano), and all of them have worked together with US scientists, so that it is difficult to distinguish between European and US CFD. For those who moved to the USA, their contributions prior to their move have been favored Last but not least,each of the authors discussed in this work has been asked~by an e-mail that I hope reached them--to write a draft of his own chapter so as to provide the most authoritative review of his contributions. Those who have done so have been duly acknowledged The other ones will have to forgive the author for an inadequate description of their merits. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
36. Results from the e+e- colliders in Novosibirsk.
- Author
-
Akhmetshin, R. R., Anisonkov, A. V., Ahokhin, S. A., Aulchenko, V. M., Banzarov, V. S., Barkov, L. M., Bashtovoy, N. S., Berkaev, D. E., Bondar, A. E., Bragin, A. V., Eidelman, S. I., Epifanov, D. A., Epshteyn, L. B., Fedotovich, G. V., Gayazov, S. E., Grebenuk, A. A., Grigoriev, D. N., Gromov, E. N., Ignatov, F. V., and Karpov, S. V.
- Subjects
COLLIDERS (Nuclear physics) ,CHARMONIUM ,PARTICLE accelerators ,DETECTORS - Abstract
Two e
+ e- colliders, VEPP-4M and VEPP2000, are taking data at the Budker INP in Novosibirsk, Russia. KEDR detector at the VEPP-4M collider continues deliver precision measurements of the charmonium family. Results of the ψ(2S ) and ψ(3770) study are presented. Two energy scans of a center-of-mass energy range from 1 GeV to 2 GeV has been performed by the VEPP2000 collider with an integrated luminosity of about 35 pb-1 , collected by each of the CMD-3 and SND detectors. This paper reports the latest results from VEPP-2000 obtained by the CMD-3 collaboration. [ABSTRACT FROM AUTHOR]- Published
- 2012
- Full Text
- View/download PDF
37. Fusion neutron research at Novosibirsk including experiments.
- Author
-
Ivanov, A. A.
- Subjects
NUCLEAR fusion ,NEUTRONS ,PHYSICS experiments ,VOLUMETRIC analysis ,NEUTRON sources ,GAS dynamics ,RADIATION trapping - Abstract
The paper reviews the characteristic features of a volumetric neutron source based on the gas dynamic trap and the results of current experiments at GDT device on modeling of the operational regimes of the neutron source. Some limiting factors in the current experiments and possible next steps towards more comprehensive modeling in a future experimental device are discussed. [ABSTRACT FROM AUTHOR]
- Published
- 2012
- Full Text
- View/download PDF
38. First Tests of LEIR — Cooler at BINP.
- Author
-
Bocharov, Valentin, Brizgunov, Maxim, Bubley, Alexander, Ershov, Viacheslav, Goncharov, Anatoly, Konstantinov, Sergey, Lomakin, Alexey, Panasyuk, Vitaly, Parkhomchuk, Vasily, Polukhin, Valery, Reva, Vladimir, Skarbo, Boris, Sukhina, Boris, Vedenev, Maxim, Zakhvatkin, Mikhail, and Zapiatkin, Nikolay
- Subjects
COOLING ,PHYSICS instruments ,ELECTRON beams ,ELECTRONS - Abstract
New electron cooling device was constructed for LEIR accumulator ring according to ILHC project at CERN. The cooler was designed, manufactured and completely tested with electron beam at BINP (Novosibirsk, Russia). Special features of the device and the results obtained are presented in the paper. © 2006 American Institute of Physics [ABSTRACT FROM AUTHOR]
- Published
- 2006
- Full Text
- View/download PDF
39. Comparative Study of Single Crystal and Polymeric Pyroelectric Detectors in the 0.9–2.0 THz Range Using Monochromatic Laser Radiation of the NovoFEL.
- Author
-
Melnikov, Anatoly R., Kalneus, Evgeny V., Getmanov, Yaroslav V., Shevchenko, Darya A., Gerasimov, Vasily V., Anisimov, Oleg A., Fedin, Matvey V., and Veber, Sergey L.
- Subjects
PYROELECTRIC detectors ,LASER beams ,FREE electron lasers ,SINGLE crystals ,ELECTRON paramagnetic resonance ,OPTICAL properties - Abstract
The development of efficient and reliable sensors operating at room temperature is essential to advance the application of terahertz (THz) science and technology. Pyroelectric THz detectors are among the best candidates, taking into account their variety, outstanding performance, ease of fabrication, and robustness. In this work, we compare the performance of six different detectors, based on either LaTiO
3 crystal or different polymeric films, using monochromatic radiation of the Novosibirsk Free Electron Laser facility (NovoFEL) in the frequency range of 0.9–2.0 THz. The main characteristics, including noise equivalent power and frequency response, were determined for all of them. Possible reasons for the differences in the obtained characteristics are discussed on the basis of the main physicochemical characteristics and optical properties of the sensitive area. At least three detectors showed sufficient sensitivity to monitor the shape and duration of the THz macropulses utilizing only a small fraction of the THz radiation from the primary beam. This capability is crucial for accurate characterization of THz radiation during the main experiment at various specialized endstations at synchrotrons and free electron lasers. As an example of such characterization, the typical stability of the average NovoFEL radiation power at the beamline of the electron paramagnetic resonance endstation was investigated. [ABSTRACT FROM AUTHOR]- Published
- 2023
- Full Text
- View/download PDF
40. The Study of Performance of a Nanoribbon Biosensor, Sensitized with Aptamers and Antibodies, upon Detection of Core Antigen of Hepatitis C Virus.
- Author
-
Ivanov, Yuri D., Malsagova, Kristina A., Goldaeva, Kristina V., Pleshakova, Tatyana O., Kozlov, Andrey F., Galiullin, Rafael A., Shumov, Ivan D., Popov, Vladimir P., Abramova, Irina K., Ziborov, Vadim S., Petrov, Oleg F., Dolgoborodov, Alexander Yu., and Archakov, Alexander I.
- Subjects
HEPATITIS C virus ,APTAMERS ,ANTIGENS ,BIOSENSORS ,MOLECULAR probes ,VIRAL antibodies ,IMMUNOGLOBULINS - Abstract
The development of highly sensitive diagnostic systems for the early revelation of diseases in humans is one of the most important tasks of modern biomedical research, and the detection of the core antigen of the hepatitis C virus (HCVcoreAg)—a protein marker of the hepatitis C virus—is just the case. Our study is aimed at testing the performance of the nanoribbon biosensor in the case of the use of two different types of molecular probes: the antibodies and the aptamers against HCVcoreAg. The nanoribbon sensor chips employed are based on "silicon-on-insulator structures" (SOI-NR). Two different HCVcoreAg preparations are tested: recombinant β-galactosidase-conjugated HCVcoreAg ("Virogen", Watertown, MA, USA) and recombinant HCVcoreAg ("Vector-Best", Novosibirsk, Russia). Upon the detection of either type of antigen preparation, the lowest concentration of the antigen detectable in buffer with pH 5.1 was found to be approximately equal, amounting to ~10
−15 M. This value was similar upon the use of either type of molecular probes. [ABSTRACT FROM AUTHOR]- Published
- 2023
- Full Text
- View/download PDF
41. Some analogical methods of teaching English as a second foreign language.
- Author
-
Mirabile, Paul Vincent
- Subjects
ENGLISH as a foreign language ,TEACHING methods ,CLASSROOM activities ,NATIVE language ,CHINESE language ,ENGLISH language ,CHINESE-speaking students - Abstract
To teach English as a second foreign language at university levels provides the educator or professor an excellent occasion to compare the first and second languages by a series of analogical activities that not only highlight the similar forms and structures of them, but more important still, oblige students to comprehend these forms and structures without having either to rely on or depend upon their mother tongue or apprehend them through the prism of their own. In this article are compared Turkish, French and Chinese forms and structures with English through sets of analogical activities that I prepared and applied in classrooms with my Russian students studying the aforesaid languages at the University of Academgorodok near Novosibirsk in Siberia. It was my methodical experiment to bring together English/Turkish, English/French and English/Chinese as interrelated objects of study; to put into relief the interpenetrating analogical elements that these languages possess as a pedagogical approach to them in spite of their very different language families and distinctive structural and morphological features. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
42. Sisal 3.2: functional language for scientific parallel programming.
- Author
-
Kasyanov, Victor
- Subjects
FUNCTIONAL programming languages ,PARALLEL programming ,INFORMATION science ,ANNOTATIONS ,MATHEMATICAL optimization ,INTERNETWORKING - Abstract
Sisal 3.2 is a new input language of system of functional programming (SFP) which is under development at the Institute of Informatics Systems in Novosibirsk as an interactive visual environment for supporting of scientific parallel programming. This paper contains an overview of Sisal 3.2 and a description of its new features compared with previous versions of the SFP input language such as the multidimensional array support, new abstractions like parametric types and generalised procedures, more flexible user-defined reductions, improved interoperability with other programming languages and specification of several optimising source text annotations. [ABSTRACT FROM PUBLISHER]
- Published
- 2013
- Full Text
- View/download PDF
43. IMPROVEMENT OF THE EFFICIENCY OF RESOURCE POTENTIAL USE OF AGRICULTURAL ORGANIZATIONS IN THE NOVOSIBIRSK REGION, RUSSIA.
- Author
-
VOLKOV, Alexander B., SHELKOVNIKOV, Sergei A., SAMOKHVALOVA, Anastasia A., DENISOV, Denis A., ANTOSHKINA, Olga G., and GOLIKOV, Alexey I.
- Subjects
AGRICULTURAL organizations ,AGRICULTURAL economics ,AGRICULTURAL productivity ,FACTORS of production ,LABOR - Abstract
Higher output of competitive and high-quality agricultural products implies the more efficient use of the resource potential held by agricultural organizations. In the modern conditions, it is essential to substantiate indicators and conditions in order to improve the efficiency of the resource potential and to determine resource potential needs for the manufacture of agricultural products. The agroindustrial complex resource system aims to improve the efficiency of its use. The entry into the resource potential system includes the attraction of main production factors (labor, land, capital, entrepreneurship). The resource potential system is used as a subsystem of a region’s economic potential. The exit from the system constitutes the more efficient use of the resource potential. The exit from the resource potential system is the entry into the production potential system with a view to manufacturing agricultural products. An agricultural organization’s resource potential is a transparent production system, in which entrepreneurship, taking into account the prevailing market conditions, the modern development level of production forces and production relations, unites, in an optimal combination, in an organization of the relevant organizational-legal form and puts into action technologically dependent factors of agricultural production (labor, land, capital). In the article, the authors substantiate conditions and targets for the efficient use of the resource potential. Taking into account innovative development and achievements of leading companies, resource needs for grain and milk output have been determined. [ABSTRACT FROM AUTHOR]
- Published
- 2019
44. Three new species of myxomycetes from Siberia.
- Author
-
VLASENKO, ANASTASIA V. and VLASENKO, VYACHESLAV A.
- Subjects
MYXOMYCETES ,MOLECULAR phylogeny ,SCANNING electron microscopy ,SPECIES - Abstract
Copyright of Czech Mycology is the property of Czech Scientific Society for Mycology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2023
- Full Text
- View/download PDF
45. Agent-based mathematical model of COVID-19 spread in Novosibirsk region: Identifiability, optimization and forecasting.
- Author
-
Krivorotko, Olga, Sosnovskaia, Mariia, and Kabanikhin, Sergey
- Subjects
COVID-19 pandemic ,MATHEMATICAL models ,STATISTICS ,DIAGNOSTIC use of polymerase chain reaction ,FORECASTING ,COVARIANCE matrices - Abstract
The problem of identification of unknown epidemiological parameters (contagiosity, the initial number of infected individuals, probability of being tested) of an agent-based model of COVID-19 spread in Novosibirsk region is solved and analyzed. The first stage of modeling involves data analysis based on the machine learning approach that allows one to determine correlated datasets of performed PCR tests and number of daily diagnoses and detect some features (seasonality, stationarity, data correlation) to be used for COVID-19 spread modeling. At the second stage, the unknown model parameters that depend on the date of introducing of containment measures are calibrated with the usage of additional measurements such as the number of daily diagnosed and tested people using PCR, their daily mortality rate and other statistical information about the disease. The calibration is based on minimization of the misfit function for daily diagnosed data. The OPTUNA optimization framework with tree-structured Parzen estimator and covariance matrix adaptation evolution strategy is used to minimize the misfit function. Due to ill-posedness of identification problem, the identifiability analysis is carried out to construct the regularization algorithm. At the third stage, the identified parameters of COVID-19 for Novosibirsk region and different scenarios of COVID-19 spread are analyzed in relation to introduced quarantine measures. This kind of modeling can be used to select effective anti-pandemic programs. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
46. Heat and mass transfer advances for energy conservation and pollution control in a renewable and sustainable energy transition.
- Author
-
Ma, Ting, Chen, Yitung, Pavlenko, Aleksandr N., and Wang, Qiuwang
- Subjects
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MASS transfer , *HEAT transfer , *RENEWABLE energy transition (Government policy) , *ENERGY conservation , *ENERGY transfer , *METHANE as fuel , *METHANE hydrates - Abstract
This Virtual Special Issue includes six peer-reviewed papers, which were selected from the plenary lectures, keynote lectures and conference papers at the 5th International Workshop on Heat Transfer Advances for Energy Conservation and Pollution Control (IWHT2019) in Novosibirsk, Russia on August 13–16, 2019. The topics of these papers mainly focus on the heat and mass transfer in energy, power and industrial process systems, including heat exchanger used for floating liquefied natural gas, methane hydrate reservoir, supercritical carbon dioxide Brayton cycle, proton exchange membrane fuel cell, and distillation columns with structured packing. The machine learning methods used for nanofluid research in renewable and sustainable energy systems were also discussed. The studies in this special issue will inform the development of energy conservation and pollution control technologies, which is the purpose of IWHT, and will also support the global decarbonisation of heat and mass transfer systems. • Six peer-reviewed papers were selected from IWHT2019. • The heat/mass transfer in energy, power and industrial process systems are focused. • It will support the global decarbonisation of heat and mass transfer systems. [ABSTRACT FROM AUTHOR]
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- 2021
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47. A PROMISING MECHANISM FOR THE MATERIAL SUPPORT OF THE FARMING INDUSTRY (A CASE STUDY OF THE NOVOSIBIRSK REGION).
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BELAITS, Dmitry S., VYSHEGUROV, Maxim S., BALASHOV, Anatoly P., KONOVA, Natalia N., SAMOKHVALOVA, Anastasiia A., and GOLIKOV, Alexey I.
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CROP losses ,AGRICULTURAL equipment ,FARM tractors ,AGRICULTURAL industries ,FIELD crops - Abstract
The ramp-up of the agricultural industry output requires the use of new, high-performance machines, whilst the complicated world economic situation has made it difficult to purchase foreign agricultural equipment. All these factors contributed to an increase in the demand for both domestic and Belarusian equipment. Tractors and various attachments are the most popular type of farm machinery with agricultural producers, which is used in almost all farm works. In this regard, there is a significant load being placed on them which leads to frequent breakdowns. At the same time, the age of tractors in farms of the Novosibirsk Region is mostly more than 10 years, which is also one of the reasons for failing. Most farms are simply unable to regularly update their machine and tractor fleet; therefore, during the spring field works or crop harvesting, it often happens that machines break down and wait for repairs for a long time. This results in crop losses and low yields. It is necessary to develop such a mechanism of the material support for agricultural producers which will help to avoid equipment downtime and lead to an increase in the gross collection. [ABSTRACT FROM AUTHOR]
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- 2018
48. Does Avian Coronavirus Co-Circulate with Avian Paramyxovirus and Avian Influenza Virus in Wild Ducks in Siberia?
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Sharshov, Kirill, Dubovitskiy, Nikita, Derko, Anastasiya, Loginova, Arina, Kolotygin, Ilya, Zhirov, Dmitry, Sobolev, Ivan, Kurskaya, Olga, Alekseev, Alexander, Druzyaka, Alexey, Ktitorov, Pavel, Kulikova, Olga, He, Guimei, Wang, Zhenghuan, Bi, Yuhai, and Shestopalov, Alexander
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AVIAN influenza A virus ,CORONAVIRUSES ,DELTACORONAVIRUS ,COVID-19 ,ORTHOMYXOVIRUSES ,NEWCASTLE disease virus ,BIRD populations ,BIRD food - Abstract
Avian coronaviruses (ACoV) have been shown to be highly prevalent in wild bird populations. More work on avian coronavirus detection and diversity estimation is needed for the breeding territories of migrating birds, where the high diversity and high prevalence of Orthomyxoviridae and Paramyxoviridae have already been shown in wild birds. In order to detect ACoV RNA, we conducted PCR diagnostics of cloacal swab samples from birds, which we monitored during avian influenza A virus surveillance activities. Samples from two distant Asian regions of Russia (Sakhalin region and Novosibirsk region) were tested. Amplified fragments of the RNA-dependent RNA-polymerase (RdRp) of positive samples were partially sequenced to determine the species of Coronaviridae represented. The study revealed a high presence of ACoV among wild birds in Russia. Moreover, there was a high presence of birds co-infected with avian coronavirus, avian influenza virus, and avian paramyxovirus. We found one case of triple co-infection in a Northern Pintail (Anas acuta). Phylogenetic analysis revealed the circulation of a Gammacoronavirus species. A Deltacoronavirus species was not detected, which supports the data regarding the low prevalence of deltacoronaviruses among surveyed bird species. [ABSTRACT FROM AUTHOR]
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- 2023
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49. New Data on the Distribution of Southern Forests for the West Siberian Plain during the Late Pleistocene: A Paleoentomological Approach.
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Gurina, Anna A., Dudko, Roman Y., Ivanov, Alexander V., Kotov, Alexey A., Mikhailov, Yuri E., Prokin, Alexander A., Prosvirov, Alexander S., Solodovnikov, Alexey Y., Zinovyev, Evgenii V., and Legalov, Andrei A.
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PLEISTOCENE Epoch ,DATA distribution ,TUNDRAS ,VALLEYS ,GROUND beetles ,DECIDUOUS plants - Abstract
Subfossil remains of insects and branchiopod crustaceans (Cladocera and Notostraca) found in three late Pleistocene deposits in the Novosibirsk region in the vicinity of the village of Suzun have been described. The calibrated radiocarbon dates for these deposits were 24,893–25,966 cal BP (Suzun-1), 20,379–20,699 cal BP (Suzun-2), and 27,693–28,126 cal BP (Nizhny Suzun), which correspond to the onset of marine isotope stage 2 (MIS 2). The insect assemblages of these deposits are mainly represented by Coleoptera, which are noteworthy for high taxonomic and ecological diversity. At least 194 beetle species from 21 families have been found altogether. Of them, 74 species were found in the Pleistocene deposits of Western Siberia for the first time. All deposits were similar in species composition of beetles; Carabidae and Curculionidae prevailed everywhere. The ecological composition was dominated by steppe and tundra-steppe species; aquatic and riparian groups were also well represented. The Cladoceran and notostracan taxa revealed in Suzun-1 and Suzun-2 are characteristic of recent steppes rather than the forest zone of Western Siberia. The studied entomocomplexes are congruent with the periglacial "Otiorhynchus-type" fauna that inhabited the southern part of the West Siberian Plain at the end of the Pleistocene and had no close contemporary analogues. Cold and dry conditions, as well as the prevailing open landscapes of the tundra-steppe type, were the reconstructed conditions for this fauna. At the same time, the Suzun-1 and Suzun-2 entomocomplexes had a distinctive feature, namely a high proportion of forest species associated with both coniferous and deciduous trees. According to these data, at the beginning of MIS 2 in the Upper Ob region, spruce forests with the participation of small-leaved species (birch) were present. They were probably confined to river valleys and were not widely distributed. [ABSTRACT FROM AUTHOR]
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- 2023
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50. Seasonal Development of Paeonia obovata and Paeonia oreogeton and Their Contents of Biologically Active and Reserve Substances in the Forest-Steppe Zone of Western Siberia.
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Kalendar, Olga V., Kostikova, Vera A., Kukushkina, Tatiana A., Erst, Andrey S., Kuznetsov, Alexander A., Kulikovskiy, Maxim S., and Vasilyeva, Olga Y.
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ORNAMENTAL plants ,INTRODUCED plants ,METABOLITES ,TANNINS ,INTRODUCED species ,VITAMIN C ,FLAVONOLS ,SAPONINS - Abstract
Paeonia obovata and Paeonia oreogeton belong to the monotypic family Paeoniaceae. Both are popular as ornamental plants. P. obovata and P. oreogeton have been introduced into Novosibirsk Oblast (Western Siberia) from Primorye (Far East). The aim of the study was to assess their adaptability as well as the effect of seasonal developmental stages on the accumulation of secondary metabolites and reserve substances in the leaves and rhizomes under the conditions of Akademgorodok (Novosibirsk, Russia). According to long-term data (15 years), P. obovata and P. oreogeton complete the entire growth cycle here, including flowering and fruiting. Both species exhibited abundant flowering, but in the first 3 years, P. oreogeton did not bloom; yet under the microclimatic conditions specifically selected for this species (a more shaded area), it started to bloom and fruit yearly. A biochemical analysis (by spectrometric method) of P. obovata and P. oreogeton grown in Akademgorodok showed that the leaves accumulate higher concentrations of flavonols (P. obovata: 1.77%), tannins (P. oreogeton: 16.42%), ascorbic acid (P. oreogeton: 155.2 mg/100 g), and sugars (P. obovata: 20.85%) as compared to the roots. Peony rhizomes contain higher concentrations of protopectins (P. oreogeton: 13.03%), saponins (P. obovata: 21.06%), and starch (P. obovata: 30.20%) than the leaves do. These data can help to increase the levels of these natural compounds in these species. Further investigation into the dynamics of accumulation of biologically active substances in the organs of peonies will help to identify introduced plant species having high biochemical potential for the pharmaceutical industry. [ABSTRACT FROM AUTHOR]
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- 2023
- Full Text
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