Zobrazeno 1 - 10
of 1 413
pro vyhledávání: '"Sakovich, A. A."'
Autor:
Sakovich, Anna, Sormani, Christina
We introduce the notion of causally-null-compactifiable space-times which can be canonically converted into a compact timed-metric-spaces using the cosmological time of Andersson-Howard-Galloway and the null distance of Sormani-Vega. We produce a lar
Externí odkaz:
http://arxiv.org/abs/2410.16800
Autor:
Sakovich, Sergei
The problem of integrability is studied for a 3D generalized Hunter-Saxton equation introduced recently by O.I. Morozov. A transformation is found which brings the equation into a constant-characteristic form and simultaneously trivializes the equati
Externí odkaz:
http://arxiv.org/abs/2407.05723
Autor:
Sakovich, Sergei
Publikováno v:
Nonlinear Phenom. Complex Syst. 26 (2023) 131-138
We study the Lax integrability of a nonlinear system of two coupled second-order evolution equations introduced by Ibragimov and Shabat. For this system we find a zero-curvature representation with an essential parameter, construct an infinite integr
Externí odkaz:
http://arxiv.org/abs/2305.00530
Autor:
Sakovich, A., Sormani, C.
Publikováno v:
Journal of Mathematical Physics Vol.64, Issue 1 (Jan 2023)
A Lorentzian manifold endowed with a time function, $\tau$, can be converted into a metric space using the null distance, $\hat{d}_\tau$, defined by Sormani and Vega. We show that if the time function is a proper regular cosmological time function as
Externí odkaz:
http://arxiv.org/abs/2208.01975
Autor:
Tatiana P. Volodashchik, Ekaterina A. Polyakova, Taisia M. Mikhaleuskaya, Inga S. Sakovich, Aleksandra N. Kupchinskaya, Aliaxandr Ch. Dubrouski, Mikhail V. Belevtsev, Joseph F. Dasso, Dzmitry S. Varabyou, Luigi D. Notarangelo, Jolan E. Walter, Svetlana O. Sharapova
Publikováno v:
Frontiers in Pediatrics, Vol 12 (2024)
Background and aimsThere is an increased risk of lymphomas in inborn errors of immunity (IEI); however, germline genetic testing is rarely used in oncological patients, even in those with early onset of cancer. Our study focuses on a child with a rec
Externí odkaz:
https://doaj.org/article/8c241992931f46a18da198fed8fd890f
Autor:
Sakovich, Sergei
Publikováno v:
Nonlinear Phenom. Complex Syst. 25 (2022) 381-386
We show that the new third-order complex nonlinear wave equation, introduced recently by M\"{u}ller-Hoissen [arXiv:2202.04512], does not pass the Painlev\'{e} test for integrability. We find two reductions of this equation, one integrable and one non
Externí odkaz:
http://arxiv.org/abs/2205.09538
Publikováno v:
Acta Biomedica Scientifica, Vol 8, Iss 5, Pp 211-224 (2023)
Background. Among patients who have undergone coronary artery bypass surgery (CABG), the proportion of people with diabetes mellitus (DM) is about 40 %. To date, the problem of choosing the optimal method of surgical myocardial revascularization, whi
Externí odkaz:
https://doaj.org/article/818a8fdde3e34a9ca3f1a7ec1ba61bbd
Publikováno v:
Technologies, Vol 12, Iss 9, p 154 (2024)
Optimization methods, namely, gradient optimization methods, are a key part of neural network training. In this paper, we propose a new gradient optimization method using exponential decay and the adaptive learning rate using a discrete second-order
Externí odkaz:
https://doaj.org/article/caad2a833bee47ef8cfbd1669c0055ca
Autor:
Sakovich, Sergei
Publikováno v:
Nonlinear Phenom. Complex Syst. 24 (2021) 311-316
The integrability of a four-dimensional sixth-order bilinear equation associated with the exceptional affine Lie algebra $D_4^{(1)}$ is studied by means of the singularity analysis. This equation is shown to pass the Painlev\'{e} test in three distin
Externí odkaz:
http://arxiv.org/abs/2109.02073
Autor:
Maria Parfenchyk, Valentina Lemesh, Elena Lagunovskaya, Valentina Sakovich, Andrei Buloichik, Elena Guzenko, Lyubov Khotyleva
Publikováno v:
Genetic Resources, Vol 5, Iss 9 (2024)
The Linum Insertion Sequence 1 (LIS-1) occurs in the genetically plastic flax genotypes in response to the lack or excess of mineral and water nutrition, but also naturally, and can be transmitted to the progeny. We have analyzed 21 ancient Belarusia
Externí odkaz:
https://doaj.org/article/0476bedd19954876bd12817315d66adc