Výsledky vyhledávání - "Alexander A. Lyapin"

Akademický článek

An Approach to Multidimensional Discrete Generating Series

Autor: Svetlana S. Akhtamova, Tom Cuchta, Alexander P. Lyapin

Publikováno v: Mathematics, Vol 12, Iss 1, p 143 (2024)

We extend existing functional relationships for the discrete generating series associated with a single-variable linear polynomial coefficient difference equation to the multivariable case.

Externí odkaz: https://doaj.org/article/6cf3b8dfe2af4d0d96d44a83d7ea0e13

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Solving the Cauchy Problem for a Two-Dimensional Difference Equation at a Point Using Computer Algebra Methods

Autor: Marina S. Apanovich, Alexander P. Lyapin, Konstantin V. Shadrin

Publikováno v: Programming and Computer Software. 47:1-5

An algorithm for finding the solution to the Cauchy problem for a two-dimensional difference equation with constant coefficients at a point using computer algebra is described. In the one-dimensional case, solving the Cauchy problem is easy; however,

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4d7f7c1492bf416e55fe111457cff124
https://doi.org/10.1134/s0361768821010023

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Competency management of laboratory personnel using LIMS

Autor: Transneft, Alexander Y. Lyapin, Konstantin S. Varaksin, Artem S. Makarov

Publikováno v: SCIENCE & TECHNOLOGIES OIL AND OIL PRODUCTS PIPELINE TRANSPORTATION. 10:636-641

The updated edition of the ISO/IEC 17025 standard introduced significant changes to the structure, terminology, resource requirements, processes, quality management system of testing and calibration laboratories. New requirements were established for

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2a34d037becf418c849454cf0e699019
https://doi.org/10.28999/2541-9595-2020-10-6-636-641

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Principles of oil flow quality management in the system of main pipelines

Autor: Egor S. Dubovoy, Alexander Y. Lyapin, Аnton А. Shmatkov, Transneft, Natalia V. Shtonda

Publikováno v: SCIENCE & TECHNOLOGIES OIL AND OIL PRODUCTS PIPELINE TRANSPORTATION. 10:499-505

In order to form an oil flow of a given quality, mixing technology is used. Once mixed, some fluctuations in the mass fraction of sulfur are observed within the flow; they depend on the dynamics in changing the indicator between flows arriving at the

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::09335922b2e49d1393d808e2b87e92b2
https://doi.org/10.28999/2541-9595-2020-10-5-499-505

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Investigation of the reasons for decreased efficiency of depressant additives during the pumping of paraffinic oils

Autor: Vladimir O. Nekuchaev, Jsc Transneft North, Alexander Y. Lyapin, Mikhail M. Mikheev, Sergei K. Ovchinnikov, Llc Transneft Supervision, Transneft

Publikováno v: SCIENCE & TECHNOLOGIES OIL AND OIL PRODUCTS PIPELINE TRANSPORTATION. 10:157-163

The purpose of the research is to find out the reasons for the decrease in the effectiveness of the depressor additive DPN-1 as oil flows through the pipeline. The objects of the research are a mixture of paraffinic oils entering the Usa – Ukhta oi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1948e9b2a3018de3038811863f5b1bb2
https://doi.org/10.28999/2541-9595-2020-10-2-157-163

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The Cauchy Problem for Multidimensional Difference Equations in Lattice Cones

Autor: Sreelatha Chandragiri, Alexander P. Lyapin

Publikováno v: Journal of Siberian Federal University. Mathematics & Physics. :187-196

We consider a variant of the Cauchy problem for a multidimensional difference equation with constant coefficients, which connected with a lattice path problem in enumerative combinatorial analysis. We obtained a formula in which generating function o

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::79b56d8ed34edb0624279a8363b27124
https://doi.org/10.17516/1997-1397-2020-13-2-187-196

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Analyzing the possibility of applying the infrared spectroscopy method in determining the boundaries of petroleum product mixture regions

Autor: Egor S. Dubovoy, Alexander Y. Lyapin, Sergey V. Sereda, Fedor V. Timofeev, Yulia A. Vishnevskaya, Transneft

Publikováno v: SCIENCE & TECHNOLOGIES OIL AND OIL PRODUCTS PIPELINE TRANSPORTATION. 10:64-69

Comparative analysis of in-line monitoring methods to determine the boundaries of the mixture region of petroleum products transported by serial transfer has been carried out. It has been found that the most promising method is infrared spectroscopy

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::848284ec791c0463bdc5ec8f0bd12582
https://doi.org/10.28999/2541-9595-2020-10-1-64-69

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Generating functions for vector partition functions and a basic recurrence relation

Autor: Alexander P. Lyapin, Sreelatha Chandragiri

Publikováno v: Journal of Difference Equations and Applications. 25:1052-1061

We define a generalized vector partition function and derive an identity for generating series of such functions associated with solutions of basic recurrence relation of combinatorial analysis. As a consequence, we obtain the generating function of

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9c466470dcf8e2d56edda0f9ec6c11a4
https://doi.org/10.1080/10236198.2019.1649396

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