Vladislavs Bezrukovs
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View article: Applications of the Irbene Single-Baseline Radio Interferometer
Applications of the Irbene Single-Baseline Radio Interferometer Open
The Irbene single-baseline radio interferometer (ISBI), operated by the Ventspils International Radio Astronomy Centre (VIRAC), offers a rare and versatile configuration in modern radio astronomy. Combining the 32-m and 16-m fully steerabl…
View article: A Hyperactive Fast Radio Burst Pinpointed in an SMC-like Satellite Host Galaxy
A Hyperactive Fast Radio Burst Pinpointed in an SMC-like Satellite Host Galaxy Open
Precise localizations of fast radio bursts (FRBs) are essential for uncovering their host galaxies and immediate environments. We present the milliarcsecond-precision European VLBI Network localization of FRB 20240114A, a hyperactive repea…
View article: A milliarcsecond localization associates FRB 20190417A with a compact, luminous persistent radio source and an extreme magneto-ionic environment
A milliarcsecond localization associates FRB 20190417A with a compact, luminous persistent radio source and an extreme magneto-ionic environment Open
We report the milliarcsecond localization of a high (1379 pc/cc) dispersion measure (DM) repeating fast radio burst, FRB 20190417A. Combining European VLBI Network detections of five repeat bursts, we confirm the FRB's host to be a low-met…
View article: A Hyperactive FRB Pinpointed in an SMC-Like Satellite Host Galaxy
A Hyperactive FRB Pinpointed in an SMC-Like Satellite Host Galaxy Open
Precise localizations of fast radio bursts (FRBs) are essential for uncovering their host galaxies and immediate environments. We present the milliarcsecond-precision European VLBI Network localization of FRB 20240114A, a hyperactive repea…
View article: Numerical Simulations of Scaling of the Chamber Dimensions of the Liquid Piston Compressor for Hydrogen Applications
Numerical Simulations of Scaling of the Chamber Dimensions of the Liquid Piston Compressor for Hydrogen Applications Open
Hydrogen compression is a critical process in hydrogen storage and distribution, particularly for energy infrastructure and transportation. As hydrogen technologies expand beyond limited industrial applications, they are increasingly suppo…
View article: Interferometer for variable astrophysical radio sources
Interferometer for variable astrophysical radio sources Open
View article: Numerical Simulations of Thermodynamic Processes in the Chamber of a Liquid Piston Compressor for Hydrogen Applications
Numerical Simulations of Thermodynamic Processes in the Chamber of a Liquid Piston Compressor for Hydrogen Applications Open
This paper presents the results of numerical simulations examining the thermodynamic processes during hydraulic hydrogen compression, using COMSOL Multiphysics® 6.0. These simulations focus on the application of hydrogen compression system…
View article: A Repeating Fast Radio Burst Source in a Low-luminosity Dwarf Galaxy
A Repeating Fast Radio Burst Source in a Low-luminosity Dwarf Galaxy Open
We present the localization and host galaxy of FRB 20190208A, a repeating source of fast radio bursts (FRBs) discovered using CHIME/FRB. As part of the Pinpointing REpeating ChIme Sources with EVN dishes repeater localization program on th…
View article: Numerical Simulations of Thermodynamic Processes in the Chamber of Liquid Piston Compressor for Hydrogen Applications
Numerical Simulations of Thermodynamic Processes in the Chamber of Liquid Piston Compressor for Hydrogen Applications Open
This paper presents the results of numerical simulations examining the thermodynamic processes during hydraulic hydrogen compression, using COMSOL Multiphysics® 6.0. These simulations focus on the application of hydrogen compression system…
View article: A Repeating Fast Radio Burst Source in a Low-Luminosity Dwarf Galaxy
A Repeating Fast Radio Burst Source in a Low-Luminosity Dwarf Galaxy Open
We present the localization and host galaxy of FRB 20190208A, a repeating source of fast radio bursts (FRBs) discovered using CHIME/FRB. As part of the PRECISE repeater localization program on the EVN, we monitored FRB 20190208A for 65.6 h…
View article: Milliarcsecond localization of the hyperactive repeating FRB 20220912A
Milliarcsecond localization of the hyperactive repeating FRB 20220912A Open
We present very long-baseline interferometry (VLBI) observations of the hyperactive repeating FRB 20220912A using the European VLBI Network (EVN) outside of regular observing sessions (EVN-Lite). We detected 150 bursts from FRB 20220912A o…
View article: Model for Hydrogen Production Scheduling Optimisation
Model for Hydrogen Production Scheduling Optimisation Open
This scientific article presents a developed model for optimising the scheduling of hydrogen production processes, addressing the growing demand for efficient and sustainable energy sources. The study focuses on the integration of advanced…
View article: Milliarcsecond Localisation of the Hyperactive Repeating FRB 20220912A
Milliarcsecond Localisation of the Hyperactive Repeating FRB 20220912A Open
We present very-long-baseline interferometry (VLBI) observations of the hyperactive repeating FRB 20220912A using the European VLBI Network (EVN) with an EVN-Lite setup. We detected 150 bursts from FRB 20220912A over two observing epochs i…
View article: MOTIONS OF THE COMPONENTS OF AGNS ACCORDING TO VLBI MOJAVE DATA AS INDICATORS OF THE ACTIVITY AND SPATIAL STRUCTURE OF THE JET
MOTIONS OF THE COMPONENTS OF AGNS ACCORDING TO VLBI MOJAVE DATA AS INDICATORS OF THE ACTIVITY AND SPATIAL STRUCTURE OF THE JET Open
The system of ten radio telescopes VLBA (Very Large Baseline Array), with a maximum baseline of about 8,600 km, of the National Radio Astronomy Observatory of the USA (NRAO USA) carries out systematic monitoring observations of about 500 a…
View article: Preserving your skies since 1988 -- Committee on Radio Astronomy Frequencies (CRAF) -- Periodic Review 2011-2021
Preserving your skies since 1988 -- Committee on Radio Astronomy Frequencies (CRAF) -- Periodic Review 2011-2021 Open
The Committee on Radio Astronomy Frequencies (CRAF) is an Expert Committee of the European Science Foundation. It aims to provide a cost-effective single voice on frequency protection issues for European radio astronomy observatories and r…
View article: R&D of a Hydraulic Hydrogen Compression System for Refuelling Stations
R&D of a Hydraulic Hydrogen Compression System for Refuelling Stations Open
The article presents a hydraulic hydrogen compression solution designed to serve as a booster compressor. It can be adapted to changing parameters of the inlet pressure of hydrogen and allows stabilising the hydrogen accumulation process i…
View article: On collective nature of nonlinear torsional Alfvén waves
On collective nature of nonlinear torsional Alfvén waves Open
Torsional Alfvén waves in coronal plasma loops are usually considered to be non-collective, i.e. consist of cylindrical surfaces evolving independently, which significantly complicates their detection in observations. This non-collective n…
View article: Observations of Weak Galactic OH Masers in 1.6 GHz Frequency Band Using Irbene RT-32 Radio Telescope
Observations of Weak Galactic OH Masers in 1.6 GHz Frequency Band Using Irbene RT-32 Radio Telescope Open
Ventspils International Radio Astronomy Centre (Ventspils University of Applied Sciences) is implementing the scientific project “Complex Investigations of the Small Bodies in the Solar System” (lzp-2018/1-0401) related to the research of …
View article: Hydrogen Hydraulic Compression System for Refuelling Stations
Hydrogen Hydraulic Compression System for Refuelling Stations Open
The article investigates the properties and potential of compressed hydrogen as one of the most promising energy carriers in order to facilitate the development of energy storage capabilities and lay down a stable foundation for the future…
View article: Axial Flux Switching Permanent Magnet Alternator with External Magnetic Cores
Axial Flux Switching Permanent Magnet Alternator with External Magnetic Cores Open
The article introduces the results of studying the magnetic field distribution in the alternator inductor with an axial arrangement of open magnetic cores (OMC) and external closure of magnetic fluxes. The study compares the efficiency of …
View article: The Study of Properties of an Axial Flux Switching Permanent Magnet Alternator with Open Magnetic Cores
The Study of Properties of an Axial Flux Switching Permanent Magnet Alternator with Open Magnetic Cores Open
The article studies magnetic field distribution in the alternator inductors with an axial arrangement of open magnetic cores (OMC) and an external closure of the magnetic flux. The study compares the efficiency of magnetic flux utilization…
View article: Magnetic Flux Switching Type Permanent Magnet Generator for Bicycles: Modelling and an Experimental Study
Magnetic Flux Switching Type Permanent Magnet Generator for Bicycles: Modelling and an Experimental Study Open
The article introduces two new designs of flux switching permanent magnet alternators with a radial and an axial arrangement of the inductor relative to the magnetic flux switch. The study presents the results of 3D magnetic flux modelling…
View article: Исследование быстрой переменности BL Lac объекта MRK 421 в оптическом диапазоне
Исследование быстрой переменности BL Lac объекта MRK 421 в оптическом диапазоне Open
MRK 421, гигантская эллиптическая галактика в созвездии Большой Медведицы, ядро которой обладает всеми свойствами объекта типа BL Lac. Она демонстрирует высокую активность и переменность от радио до гамма-диапазонов на временной шкале от н…
View article: Single-baseline interferometer for mJy observations
Single-baseline interferometer for mJy observations Open
The Ventspils International Radio Astronomy Centre (VIRAC) of Ventspils University of Applied Sciences (VeUAS) has developed an 800 m single-baseline interferometer consisting of 32 m (IR) and 16 m (IB) radio telescopes with 15 arcseconds …
View article: X-Ray Burst and Persistent Emission Properties of the Magnetar SGR 1830-0645 in Outburst
X-Ray Burst and Persistent Emission Properties of the Magnetar SGR 1830-0645 in Outburst Open
We report on NICER X-ray monitoring of the magnetar SGR 1830−0645 covering 223 days following its 2020 October outburst, as well as Chandra and radio observations. We present the most accurate spin ephemerides of the source so far: ν = 0.0…
View article: Features of Secular Changes in the Flux Density of the Cas a Supernova Remnant, from Centimeter to Decameter Wavelengths
Features of Secular Changes in the Flux Density of the Cas a Supernova Remnant, from Centimeter to Decameter Wavelengths Open
The purpose of this work is to summarize a large amount of observational data about the secular decrease of Cas A flux in the radio range, as an indicator of physical processes both in the source itself and as a consequence of the influenc…
View article: COSMIC “STRUVE ARC” AS INDICATOR OF THE MANIFESTATION OF SOLAR AND GEOMAGNETIC ACTIVITY
COSMIC “STRUVE ARC” AS INDICATOR OF THE MANIFESTATION OF SOLAR AND GEOMAGNETIC ACTIVITY Open
View article: PERIODIC AND SPORADIC VARIATIONS IN THE SPECTRAL FLUX DENSITY OF THE CAS A SUPERNOVA REMNANT
PERIODIC AND SPORADIC VARIATIONS IN THE SPECTRAL FLUX DENSITY OF THE CAS A SUPERNOVA REMNANT Open
Purpose: Based on the long-term study data in all radio spectrum ranges, the nature of deviations of spectral flux density of the Cas A supernova remnant from the tendency of its secular decrease is considered. The aim of this work is dete…
View article: Observations of OH masers of comets in 1.6GHz frequency band using the Irbene RT32 radio telescope
Observations of OH masers of comets in 1.6GHz frequency band using the Irbene RT32 radio telescope Open
Institute of Astronomy (University of Latvia) with Ventspils International Radio Astronomy Centre (Ventspils University of Applied Sciences) participation is implementing the scientific project “Complex investigations of the small bo…
View article: The Comparison of the Efficiency of Small Wind Turbine Generators with Horizontal and Vertical Axis Under Low Wind Conditions
The Comparison of the Efficiency of Small Wind Turbine Generators with Horizontal and Vertical Axis Under Low Wind Conditions Open
The authors perform a comparative analysis of the efficiency of two types of low-power wind energy conversion systems with horizontal and vertical axis in the meteorological conditions of Latvia. The analysis is based on long-term wind spe…