Results 31 to 40 of about 968,315 (290)

A spatial epidemic model with a moving boundary

open access: yesInfectious Disease Modelling, 2021
We present a new mathematical model to investigate the spatial spread of an infectious disease. The model consists of a nonlinear PDE system with an unknown velocity field, defined on an epidemic domain that changes with time.
Qiao Zhuang, Jin Wang
doaj   +1 more source

Analysis of segregated boundary-domain integral equations for mixed variable-coefficient BVPs in exterior domains [PDF]

open access: yes, 2011
This is the post-print version of the Article. The official published version can be accessed from the link below - Copyright @ 2011 Birkhäuser Boston.Some direct segregated systems of boundary–domain integral equations (LBDIEs) associated with the mixed
B. Hanouzet   +17 more
core   +1 more source

THE FORMALIZED MATHEMATICAL CONTENT COGNITIVE MANAGEMENT

open access: yesСовременные информационные технологии и IT-образование, 2018
Problem of the formalized mathematical content management for any given subject domain is considered. The content represented by domain ontology as the unified variety of elementary knowledge classes and relations for such classes as subject domain ...
Konstantin I. Kostenko   +1 more
doaj   +1 more source

Design of Single-phase PWM Rectifier Based on PI Double-loop Control

open access: yesTehnički Vjesnik, 2023
In this paper, the mathematical model of PWM rectifier is analyzed first, and the rotating coordinate system transformation is used to convert the mathematical model to frequency domain, and the control model is established through the frequency domain ...
Kezhou Bai, Qushan Chen
doaj   +1 more source

An extension theorem for regular functions of two quaternionic variables [PDF]

open access: yes, 2019
For functions of two quaternionic variables that are regular in the sense of Fueter, we establish a result similar in spirit to the Hanges and Tr\`eves theorem.
Baracco, Luca   +2 more
core   +2 more sources

Exact asymptotic behavior of magnetic stripe domain arrays [PDF]

open access: yes, 2012
The classical problem of magnetic stripe domain behavior in films and plates with uniaxial magnetic anisotropy is treated. Exact analytical results are derived for the stripe domain widths as function of applied perpendicular field, $H$, in the regime ...
Galperin, Yuri M.   +2 more
core   +3 more sources

Small-Signal Modeling of AC Power Electronic Systems: Critical Review and Unified Modeling

open access: yesIEEE Open Journal of Power Electronics, 2021
The harmonic state-space (HSS), the dynamic phasor (DP), and the generalized dq (GDQ) modeling are three widely used methods for small-signal analysis of ac power electronic systems.
Yicheng Liao, Xiongfei Wang
doaj   +1 more source

MATHEMATICAL MODELING OF POLLUTANT TRANSPORT AND DISPERSION PROCESSES IN THE DNIESTER RIVER [PDF]

open access: yesJournal of Engineering Science (Chişinău), 2020
This paper approaches the issue of water quality in river-type aquatic systems. It is discussed the importance of applying the mathematical and numerical models in order to assess the water quality and to predict different water pollution scenarios.
BRANIȘTE, Rodica, MARUSIC, Galina
doaj   +1 more source

Mathematical analysis of parallel convective exchangers with general lateral boundary conditions using generalized graetz modes [PDF]

open access: yes, 2013
We propose a mathematical analysis of parallel convective exchangers for any general but longitudinally invariant domains. We analyze general Dirichlet or Neumann prescribed boundary conditions at the outer solid domain.
Bouyssier, Julien   +2 more
core   +3 more sources

Simulation of Distributed Current Sensor Based on Optical Fiber Deformation

open access: yesПриборы и методы измерений, 2019
Due to the development of automation and control systems, methods and devices for measuring of electric current large values are of great interest. The aim of the work was to develop a schematic diagram of a distributed current strength sensor based on ...
T. P. Yanukovich, A. V. Polyakov
doaj   +1 more source

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