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Обнаружение двух новых RRAT на частоте 111 МГц
Астрономический журнал. 2023. Т. 100. № 6. С. 517–523.
At the LPA LPI radio telescope, a search was conducted for pulse signals in a specific area with declinations + 52° <δ< + 55°. The processing involved ten months of observations recorded in six frequency channels, each with a channel width of 415 kHz and a total bandwidth of 2.5 MHz. The analysis of the data revealed 22000 events, exhibiting a pronounced dispersion delay of signals over the frequency channels, which are indicative of pulsar pulses. These pulses were found to belong to four known pulsars and two new rotating radio transients (RRAT). Additional pulse search was carried out in 32-channel data with a channel width of 78 kHz. This led to the discovery of 8 pulses for the transient J0249+52 and 7 pulses for the transient J0744+55. No periodic emission of transients was detected. The analysis of the observations indicates a high probability that the identified RRATs are pulsars with nullings, where the fraction of nullings is greater than 99.9%.
Aleksei Samarin, Nazarenko A., Nazarenko D. et al., Machine Learning and Knowledge Extraction 2026 Vol. 8 No. 10 Article 330
Automated microscopic image analysis is essential for quantitative microbiology, yet manual acquisition and generic recognition models struggle with morphological variability and scene artifacts. We address both ends of this pipeline. First, we present a low-cost, open-source acquisition system, based on an Arduino UNO R3 microcontroller and NEMA 17 stepper motors, that automates focusing, magnification, and ...
Added: October 14, 2026
Mamedov I., Fofanov M., Lukianchenko P. et al., IEEE Access 2026 No. 14 P. 26662–26671
DreamBooth-style personalization, which often relies on one or a few images, can memorize context (background, pose, lighting) rather than learning the subject’s identity, thereby reducing fidelity and limiting prompt-driven edits. P-LoRA (Probability LoRA) is introduced as a training-time modification that biases diffusion timestep sampling and utilizes importance weights, ensuring that the overall objective remains unchanged. ...
Added: October 14, 2026
Parkhomenko V., Kulikova S., Buzmakov A. V., Lobachevskii Journal of Mathematics 2026 Vol. 47 No. 6 P. 2979–2992
The stability of formal concepts and its generalization as robustness are considered in the paper. We use an approximation of stability in the form of Δ-measure for fast calculations. A computationally efficient method for calculating robustness based on subcontexts is presented. We also present a new method to analytically evaluate the number of preimages for ...
Added: October 14, 2026
Kuznetsov A. P., Sedova Y. V., Sataev I. R. et al., Mathematics and Computers in Simulation 2027 Vol. 2 P. 574–592
Universal bifurcation structures on the parameter plane of nonlinear systems, known as shrimps, are discussed. An overview of numerous examples from various fields of science is given. Shrimps are typical for both maps of different dimensions and flows. The varieties of shrimp are discussed and relevant examples are given. The similarity property on the parameter ...
Added: October 14, 2026
Springer, 2026.
This book highlights cutting-edge research in the field of network science, offering scientists, researchers, students and practitioners a unique update on the latest advances in theory and a multitude of applications. It presents the peer-reviewed proceedings of the XIV International Conference on Complex Networks and their Applications (COMPLEX NETWORKS 2025). The carefully selected papers cover ...
Added: October 13, 2026
Springer, 2026.
This book offers a comprehensive overview of the latest research, innovations, and practical applications in the field of sustainability, with a focus on construction materials and their use in building and civil engineering structures. As an outcome of the 3rd International Conference on Sustainability: Developments and Innovations (ICSDI 2026), this book presents a selection of ...
Added: October 13, 2026
Dmitriev A., Kornilov V., Batienkov R., Lecture Notes in Civil Engineering 2026 Vol. 886 P. 249–255
Numerous studies have provided compelling evidence that the probability distribution of avalanche sizes follows a power law, and that 1/f noise is present in the stochastic dynamics of landslides. We present a theoretical explanation of these phenomena within the framework of self-organized criticality theory, proposing a discrete-time model in the form of a sandpile cellular ...
Added: October 13, 2026
Dmitriev A., Shulman I., Lebedev A., Studies in Computational Intelligence 2026 Vol. 1265 P. 266–273
A discrete-time model is presented for the self-organization of the X/Twitter social network to the edge of a phase transition, characterized by avalanche-like propagation of information in the network. The model is based on the analogy between the critical dynamics of the X social network and sandpile cellular automata with Manna rule on the Chung-Lu ...
Added: October 13, 2026
Biryukov A., Beskin G., Monthly Notices of the Royal Astronomical Society 2023 Vol. 522 No. 4 P. 6258–6263
Numerical simulations predict that the spin-down rate of a single rotation-powered neutron star depends on the angle α between its spin and magnetic axes as $P\dot{P} \propto \mu ^2 (k_0 + k_1\sin ^2\alpha)$, where P is the star spin period, μ is its magnetic moment, while k0 ~ k1 ~ 1. Here, we describe a simple observational ...
Added: June 8, 2023
Samodurov V., Дагкесаманский Р. Д., Pozanenko A. S. et al., В кн.: Расширенные тезисы докладов Всероссийской радиоастрономической конференции «Радиотелескопы, аппаратура и методы радиоастрономии» (ВРК-2022).: СПб.: [б.и.], 2022. С. 44–44.
One of the fundamental problems of astrophysics is the study of sources and mechanisms for the formation of high and ultrahigh energy cosmic rays. It is assumed that primary cosmic rays in the energy range 10^16-10^19 eV are generated by both galactic and (at higher energies) extragalactic sources. One of the ways to detect high-energy ...
Added: December 20, 2022
СПб.: [б.и.], 2022.
One of the fundamental problems of astrophysics is the study of sources and mechanisms for the formation of high and ultrahigh energy cosmic rays. It is assumed that primary cosmic rays in the energy range 10^16-10^19 eV are generated by both galactic and (at higher energies) extragalactic sources [2]. One of the ways to detect ...
Added: December 20, 2022
Novoselov E. M., Beskin V. S., Galishnikova A. K. et al., Monthly Notices of the Royal Astronomical Society 2020 Vol. 494 No. 3 P. 3899–3911
At present, there is no direct information about evolution of inclination angle χ between magnetic and rotational axes in radio pulsars. As to theoretical models of pulsar evolution, they predict both the alignment, I.e. evolution of inclination angle χ to 0°, and its counter-alignment, I.e. evolution to 90°. In this paper, we demonstrate that the ...
Added: October 31, 2022
Khokhryakova A. D., Biryukov A., Popov S. B., Astronomy Reports 2021 Vol. 65 No. 7 P. 615–630
A four-year sky survey with the use of the eROSITA telescope on board the Spektr-RG observatory with focusing optics will provide the best coverage in the soft (0.5-2 keV) and standard (2-10 keV) X-ray ranges, both in terms of sensitivity and angular resolution. We have investigated the possibility of detecting various types of single neutron ...
Added: October 31, 2022
Samodurov V., Тюльбашев С. А., Торопов М. О. et al., Астрономический журнал 2022 Т. 99 № 4 С. 334–341
A search for impulse signals was carried out in a new site included in the monitoring program for the search for pulsars and transients. Processing of several months of data recorded in six frequency channels with a total bandwidth of 2.5 MHz showed that, on average, 4 pulses per hour are observed in each of ...
Added: April 23, 2022
Igoshev A., Popov S., Astronomische Nachrichten 2021 Vol. 342 No. 1-2 P. 216–221
The role of magnetic field decay in normal radio pulsars is still debated. In this paper, we present results which demonstrate that an episode of magnetic field decay in hot young neutron stars can explain anomalous values of braking indices recently measured for more than a dozen of sources. It is enough to have few ...
Added: March 24, 2021
Даниленко А. А., Карпова А. В., Ofengeim D. et al., Monthly Notices of the Royal Astronomical Society 2020 Vol. 493 No. 2 P. 1874–1887
We report results of XMM-Newton observations of a γ-ray pulsar J0633+0632 and its wind nebula. We reveal, for the first time, pulsations of the pulsar X-ray emission with a single sinusoidal pulse profile and a pulsed fraction of 23 ± 6 per cent in the 0.3-2 keV band. We confirm previous Chandra findings that the ...
Added: November 11, 2020
Igoshev A., Popov S., Monthly Notices of the Royal Astronomical Society 2020 Vol. 499 No. 2 P. 2826–2835
Recently, Parthsarathy et al. analysed long-term timing observations of 85 young radio pulsars. They found that 15 objects have absolute values of braking indices ranging ∼10–3000, far from the classical value n = 3. They also noted a mild correlation between measured value of n and characteristic age of a radio pulsar. In this article, we systematically ...
Added: October 23, 2020
Zheleznyakov V. V., V. E. Shaposhnikov, Monthly Notices of the Royal Astronomical Society 2020 Vol. 495 No. 4 P. 3715–3721
We study the origin of quasi-harmonic emission bands with fine structure observed in the
dynamic radiation spectra of high-frequency interpulses. The possible explanation of observed
structure is based on the effect of double plasma resonance (DPR) at electron cyclotron
harmonics realized in the magnetosphere of pulsar in a local radio emission source filled
with non-relativistic plasma. The model of ...
Added: September 10, 2020
Bespalov P. A., Olga N. Savina, Monthly Notices of the Royal Astronomical Society 2020 Vol. 498 P. 2864–2870
A model for the source of microwave main giant pulses (GPs) from the Crab pulsar is proposed and partly investigated. Pulse excitation takes place in a relativistic pair plasma with a strong magnetic field through the beam pulse amplifier (BPA) mechanism, in which short noise pulses of a certain type are amplified by energetic electrons ...
Added: August 18, 2020
Lutovinov A., Monthly Notices of the Royal Astronomical Society: Letters 2018 Vol. 479 No. 1 P. L134–L138
We report on the monitoring of the final stage of the outburst from the first Galactic ultraluminous X-ray pulsar Swift J0243.6+6124, which reached ˜40 Eddington luminosities. The main aim of the monitoring program with the Swift/XRT telescope was to measure the magnetic field of the neutron star using the luminosity of transition to the `propeller' ...
Added: November 1, 2018
Родин А. Е., Орешко В. В., Samodurov V., Астрономический журнал 2017 Т. 94 № 1 С. 35–43
Описан метод поиска новых периодических источников радиоизлучения, основанный на спектральном анализе, по данным ежедневного мониторинга неба на Большой синфазной антенне (БСА) Пущинской радиоастрономической обсерватории АКЦ ФИАН на частоте 111 МГц. Обсуждаются особенности обнаружения таких источников на БСА. Приводится список обнаруженных периодических источников (всего 16 пульсароподобных источников), их координаты, период и мера дисперсии. ...
Added: March 13, 2017
Железняков В. В., Злотник Е. Я., Зайцев В. В. et al., Успехи физических наук 2016 Т. 186 № 10 С. 1090–1116
The double plasma resonance effect is a phenomenon in which plasma waves in a magnetized plasma show a sharp increase in instability when the upper hybrid frequency coincides with a cyclotron harmonic frequency. a radiation mechanism associated with this effect provides an explanation of the origin of the "zebra pattern" in radio spectra of the ...
Added: November 18, 2016
Лосовский Б. Я., Dumsky D., Логвиненко С. В., Астрономический журнал 2016 Т. 93 № 2 С. 160–166
An analysis of monitoring observations for the pulsar PSR B0655+64, which is located in a
binary system, at 111 MHz during 2002–2015 are presented. The Keplerian parameters of the pulsar
have been refived: the longitude of periastron ω = 276 ◦ .5785 ± 0 ◦ .0005 and the orbital semi-major axis
is a p sin i = 4.124976 ...
Added: December 25, 2015
Лосовский Б. Я., Dumsky D., Астрономический журнал 2014 Т. 91 № 8 С. 626–633
Observations of the RRAT pulsars J0627+16, J0628+09, J1819−1458, J1826−1419,
J1839−01, J1840−1419, J1846−0257, J1848−12, J1850+15, J1854+0306, J1919+06, J1913+1330,
J1919+17, J1946+24, and J2033+00 observed earlier on the 64-m Parkes telescope (Australia) and the
300-m Arecibo radio telescope (Puerto Rico) at 1400 MHz were conducted at 111 MHz on the LSA
radio telescope of the Pushchino Radio Astronomy observatory in 2010–2012. A ...
Added: November 23, 2015