Zobrazeno 1 - 10
of 90
pro vyhledávání: '"Alexander Dyachenko"'
Publikováno v:
Нижневолжский археологический вестник, Iss 1, Pp 329-332 (2023)
The article summarizes the results of the All-Russian Scientific Conference with International Participation “Problems of Sarmatian Archeology and History” dedicated to the memory of Prof. Anatoly S. Skripkin. The leading theme of the conference
Externí odkaz:
https://doaj.org/article/ece273ef7911451d989f690cac48e882
Publikováno v:
Axioms, Vol 12, Iss 1, p 89 (2023)
Measures generating classical orthogonal polynomials are determined by Pearson’s equation, whose parameters usually provide the positivity of the measures. The case of general complex parameters (nonstandard) is also of interest; the non-Hermitian
Externí odkaz:
https://doaj.org/article/5bdc18b1916f4e6f8651e76598d1cbd3
Autor:
Alexander Dyachenko, Dmitrii Karp
Publikováno v:
Mathematics, Vol 10, Iss 20, p 3903 (2022)
Given real parameters a,b,c and integer shifts n1,n2,m, we consider the ratio R(z)=2F1(a+n1,b+n2;c+m;z)/2F1(a,b;c;z) of the Gauss hypergeometric functions. We find a formula for ImR(x±i0) with x>1 in terms of real hypergeometric polynomial P, beta d
Externí odkaz:
https://doaj.org/article/35db748bc3dd46ba8da884253a8a56d8
Publikováno v:
Fluids, Vol 7, Iss 6, p 204 (2022)
In this paper we propose two Hamiltonian models to describe two-dimensional deep water waves propagating on the surface of an ideal incompressible three-dimensional fluid. The idea is based on taking advantage of the Zakharov equation for one-dimensi
Externí odkaz:
https://doaj.org/article/cfa8c4d721bb41968b68545da2bea618
Publikováno v:
Fluids, Vol 6, Iss 3, p 115 (2021)
This article presents a study of bound periodically oscillating coherent structures arising on the free surface of deep water. Such structures resemble the well known bi-soliton solution of the nonlinear Schrödinger equation. The research was carrie
Externí odkaz:
https://doaj.org/article/1a94e860d56e475590de097468be6836
Publikováno v:
Fluids, Vol 5, Iss 2, p 67 (2020)
We investigate and compare soliton turbulence appearing as a result of modulational instability of the homogeneous wave train in three nonlinear models for surface gravity waves: the nonlinear Schrödinger equation, the super compact Zakharov equatio
Externí odkaz:
https://doaj.org/article/ff048c43629841b1bb99b1cc78628240
Publikováno v:
Fluids, Vol 5, Iss 2, p 65 (2020)
The paper presents the long-time dynamics with multiple collisions of breathers in the super compact Zakharov equation for unidirectional deep water waves. Solutions in the form of breathers were found numerically by the Petviashvili method. In the t
Externí odkaz:
https://doaj.org/article/66c23593a1c14b97825023643d2b6910
Publikováno v:
Fluids, Vol 4, Iss 2, p 83 (2019)
We numerically investigate pairwise collisions of solitary wave structures on the surface of deep water—breathers. These breathers are spatially localised coherent groups of surface gravity waves which propagate so that their envelopes are stable a
Externí odkaz:
https://doaj.org/article/7eef0ff1f7b74ddb9bd2535996fa7446
Autor:
Alexander Dyachenko
Publikováno v:
Fluids, Vol 4, Iss 1, p 47 (2019)
The waves on a free surface of 2D deep water can be split into two groups: the waves moving to the right, and the waves moving to the left. A specific feature of the four-wave interactions of water waves allows to describe the evolution of the two gr
Externí odkaz:
https://doaj.org/article/5099daee1bc147ce9d6e239b4b000485
Autor:
Maksim Alekhin, Lesya Anishchenko, Alexander Tataraidze, Sergey Ivashov, Vladimir Parashin, Alexander Dyachenko
Publikováno v:
International Journal of Antennas and Propagation, Vol 2013 (2013)
Comparison of bioradiolocation and standard respiratory plethysmography signals during simultaneous registration of different types of the human breathing movements is performed in both time and frequency domains. For all couples of synchronized sign
Externí odkaz:
https://doaj.org/article/1a6d45f6182d48c19cc232472d638f38