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Фильтр Калмана с полосовой частотной фильтрацией для выделения Чандлеровского колебания полюса.
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One of the major components of the Earth’s polar motion is Chandler wobble with 433-day period. To extract it from observations narrow-band filtering is required. We have developed method which joins Kalman filtering and band-pass filtering in direct time with the phase correction in reversed time. By using Euler-Liouville equation generating resonant CW as a filter we managed to extract prograde Chandler wobble from the two-dimensional state vector. In 2020 the amplitude of CW decayed to zero and phase of the wobble had undergone a jump.
In book
Пермский государственный университет, 2025.
Bernardin C., Chhaibi R., Najnudel J. et al., Probability Theory and Related Fields 2026 Vol. 195 P. 1823–1875
We study the celebrated Shiryaev-Wonham filter (Wonham, W.M., in J. Soc. Ind. Appl. Math. 347–369, 1964) in its historical setup, where the hidden Markov jump process has two states. We are interested in the weak noise regime for the observation equation. Interestingly, this becomes a strong noise regime for the filtering equations. Earlier results of ...
Added: October 5, 2026
Aleksei Samarin, Aleksei Toropov, Kotenko E. et al., , in: Proceedings of the 37th Conference of Open Innovations Association FRUCT, Helsinki, Finland, 14-16 May 2025, Issue 1 (Full Papers)Vol. 37.: Helsinki: FRUCT Oy, 2025. P. 271–277.
This study focuses on improving iris and pupil segmentation in infrared images, a crucial task for gaze-tracking systems. We propose a lightweight image preprocessing approach, which ensures controlled data transformation, effectively eliminating parasitic reflections, noise, and contrast inconsistencies without introducing unwanted artifacts. Our approach employs analytically defined transformations, incorporating local and global filtering techniques to ...
Added: September 19, 2026
Shehtman V. B., Gagarin A., , in: Graph Games and Logic Design. Recent Developments and Further Directions. (TREN, volume 66)Vol. 66.: Springer, 2026. Ch. 17 P. 419–450.
The chapter contains an overview of results on products of propositional modal logics and related constructions: semiproducts, Segerberg squares, and others. We focus mainly on axiomatizations, finite model property, and decidability; we also sketch connections with classical and modal predicate logics. In some cases we give ideas of proofs, especially of those using games. ...
Added: June 30, 2026
Springer, 2026.
This book presents established and new research on the close connections between graph games and systems of logic, particularly existing and newly designed modal logics. The volume utilizes two graph games – the sabotage game and the hide-and-seek game – to demonstrate the natural interplay between designing new graph games and exploring new kinds of ...
Added: June 30, 2026
Исаев М. Р., Bobrov P., Журнал высшей нервной деятельности им. И.П. Павлова 2022 Т. 72 № 5 С. 728–738
The paper proposes methods for brain–computer interface, based on the hemodynamic activity registration using near–infrared spectroscopy (NIRS) and adapted for using in the movement disorders rehabilitation. Methods include a filtration adapted to the instructions frequency, step by step classification of the rest state and active tasks, as well as training of the interface classifier on ...
Added: March 18, 2026
Zotov L., Sidorenkov N., Bizouard C., , in: Proceedings of the 19th Annual Meeting ofthe Asia Oceania Geosciences Society.: Singapore: World Scientific Publishing Co. Pte. Ltd, 2023. P. 153–155.
In early 2000-s the amplitude of the Chandler wobble (CW) started to decrease and in 2017-2020 reached its historic minima, comparable only with the minima of ~1928 yr. In 2021 the CW appeared again. We demonstrate that the phase of the CW is changing now, as during 1920-1930s. Since 2010 it has changed almost by ...
Added: March 5, 2026
Zotov L., Sidorenkov N., Bizouard C., , in: Proceedings of the XV Conference and School (St. Petersburg, Russia, April 22–26). Problems of Geocosmos—2024.: Switzerland: Springer, 2026. P. 289–312.
Earth rotation in recent epoch shows anomalies: its rotation velocity reached decadal maximum in 2024; the Chandler wobble (CW) of the rotation axis disappeared in 2018–2020, then resumed with a phase changed by 180^\circ
◦; the ampli-tude of the Free Core Nutation (FCO) decreased since 2021 as well. We analyzed the CW amplitude modulations since the ...
Added: March 1, 2026
Latyshev A., В кн.: Государственное управление в СССР в годы Второй мировой войны. Фронт и тыл: Материалы XVII Международной научной конференции. Екатеринбург, 19–22 июня 2025 г.: М.: Издательство "Политическая энциклопедия", 2025. С. 490–498.
The article analyzes the institutional, organizational, and ideological aspects of the state's work with returning military personnel after the battles with Japan at Khalkhin Gol, the war with Finland, during and after the Great Patriotic War. The priorities of the state and state security agencies, the logic of the latter's work, are being clarified. The ...
Added: December 2, 2025
Kudinov A., Shapirovsky I., Studia Logica 2025 P. 1–25
We study the finite model property of subframe logics with expressible transitive
reflexive closure modality. For m > 0, let Lm be the logic defined by axiom ♦^{m+1}p →
♦p ∨ p. We construct quotient filtrations for the logics Lm, which implies that these logics
and their tense counterparts have the finite model property. Then, we construct selective
filtrations ...
Added: October 14, 2025
Лескина Э. И., Журнал российского права 2025 Т. 29 № 8 С. 50–65
The evolution of the understanding of freedom of speech occurs, among other things, in connection with the development of information and communication technologies, the ways in which people actually exercise freedom of speech. The development of platforms and social networks, in which big data plays a key role, lead us to a new era of ...
Added: September 4, 2025
Zotov L., Юшкин В. Д., Фролова Н. Л. et al., , in: Информационные технологии и нанотехнологии (ИТНТ-2024). сборник трудов по материалам X Международной конференции и молодежной школы: в 6 томах.: Самарский государственный университет, 2024. P. 22002–22004.
The GRACE and GRACE-FO satellites provide data on the Earth's gravitational field changes and are among the most successful NASA/DLR geodetic missions in recent decades. Based on their data, the melting of glaciers, redistribution of masses in the river basins, and changes in the ocean mass are studied. We use multichannel singular spectral analysis (MSSA) ...
Added: May 30, 2025
Abrashkin A. A., World Scientific Publishing Co. Pte. Ltd, 2025.
This book is devoted to the problems of the analytical description of incompressible fluid flows in Lagrangian variables. Commonly, specialists in fluid dynamics prefer to use the Euler approach. For example, even classical textbooks by J. Batchelor, L.G. Loitsyansky, L.D. Landau, and E.M. Lifshitz do not provide the Lagrange equations of f luid dynamics. Exceptions ...
Added: January 28, 2025
Сурова С. В., Furmanov K. K., Известия Дальневосточного федерального университета. Экономика и управление 2024 № 1 С. 80–90
We consider a simple exponential queueing system with a finite capacity and heterogeneous customers. Type I customers are patient, they join the queue if the system capacity allows it. Type II customers are impatient, so that they refuse to join the queue if the waiting time is too large (so-called wait-based balking). The system makes profit ...
Added: November 12, 2024
Л.И. Кузьмина, Осипов Ю. В., Строительные материалы 2024 № 8 С. 63–68
Фильтрация суспензий и коллоидов в пористых материалах встречается при строительстве и эксплуатации гидросооружений, туннелей и подземных хранилищ. Модели фильтрации используются при расчете проникновения укрепителя в рыхлый грунт, при очистке питьевой воды и промышленных стоков. В процессе фильтрации взвешенные частицы проходят через крупные поры и застревают на входе пор малого диаметра. Задержанные частицы образуют неподвижный осадок. ...
Added: October 31, 2024
Zotov L., Сидоренков Н. С., Марчукова О. В. et al., В кн.: ВОПРОСЫ ТЕОРИИ И ПРАКТИКИ ГЕОЛОГИЧЕСКОЙ ИНТЕРПРЕТАЦИИ ГРАВИТАЦИОННЫХ, МАГНИТНЫХ И ЭЛЕКТРИЧЕСКИХ ПОЛЕЙ 50-я юбилейная сессия Международного семинара им. Д.Г. Успенского - В.Н. Страхова. Москва, 2024.: М.: Издательство "Перо", 2024. С. 162–166.
Since strong El Nino 2016 the tendency of acceleration of the Earth rotation has been observed. In 2022 the Earth rotation velocity reached maxima comparable with those happened 90 years ago. Triplet of La Nina accompanied this case. Chandler wobble of the pole almost disappeared in 2017-2020, which was earlier observed only in the end ...
Added: March 1, 2024
Zotov L., Industry 4.0 2023 Vol. 8 No. 5 P. 166–168
In 2022 the Erath rotation velocity reached its maximum and in 2017-2020 the Chandler wobble of the rotational axis disappeared for the second time in the history of observations. Unexplained modulations of 90 and 20-25 year periods are observed. They reflect geophysical processes in the atmosphere, ocean, and Earth’s interior and can be linked to ...
Added: February 10, 2024
Campillo A., Delgado F., Sabir M. Gusein-Zade, Bulletin of the London Mathematical Society 2024 Vol. 56 No. 1 P. 449–459
There exist several equivalent equations for the Poincaré series of a collection of valuations on the ring of germs of functions on a complex analytic variety. We give definitions of the Poincaé series of a collection of valuations in the real setting (i.e., on the ring of germs of functions on a real analytic variety), ...
Added: December 5, 2023
Л. И. Кузьмина, Осипов Ю. В., Строительные материалы 2023 № 9 С. 89–93
Фильтрация взвешенных твердых частиц в пористом материале моделирует процессы укрепления фундаментов, создания водонепроницаемых стен в горной породе, строительстве и реконструкции дорог, кольматацию (осаждение частиц) в призабойной зоне скважины компонентами бурового раствора при нефтедобыче, работу фильтрующих элементов очистных сооружений и многое другое. Целью настоящей работы явилось исследование фильтрации монодисперсной суспензии высокой концентрации в однородной пористой среде, ...
Added: October 31, 2023
Latyshev A., В кн.: История России с древнейших времен до XXI века: проблемы, дискуссии, новые взгляды: сборник статей Международной научно-практической школы-конференции молодых ученых (25–28 октября 2022 г.).: М.: Институт российской истории РАН, 2022. С. 404–411.
In the labor camps of the NKVD, soldiers who returned from enemy captivity and encirclement, ordinary collaborators and suspicious civilians were filtered. These people were supposed to be send to the NKVD filtration camps specially created for this task, but they also entered the labor camps in large numbers. This article, on the basis of ...
Added: December 8, 2022
Kuzmina L., Осипов Ю. В., Шайдуллина А. М., Промышленное и гражданское строительство 2021 № 10 С. 72–77
When designing tunnels and underground structures, filtration of particles in porous rock has to be
considered. Long-term, deep bed filtration of suspensions and colloids in a porous medium leads to the formation of
deposit in the pores and a change in the structure of the porous rock framework. The filtration model includes the
equation for the balance of ...
Added: October 26, 2022
Zotov L., Сидоренков Н. С., Бизуар К., Вестник Московского университета. Серия 3: Физика и астрономия 2022 № 3 С. 64–72
The Earth’s rotation is nonuniform: the position of the pole drifts and describes circles with the annual and Chandler (433 days) periods; the Earth’s rotation velocity also varies. In the beginning of 2000s, the amplitude of the Chandler wobble began to decrease and in 2017–2020 reached a historical low comparable only with the low of ...
Added: October 25, 2022