Speed Oscillations of a Vehicle Rolling on a Wavy Road
Applied Sciences, 2021 Every driver knows that his car is slowing down or accelerating when driving up or down, respectively. The same happens on uneven roads with plastic wave deformations, e.g., in front of traffic lights or on nonpaved desert roads.
Walter V. Wedig
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Evaluation of urban green spaces in Tabriz from 1976 to 2016 using satellite images and changes prediction with artificial neural networks [PDF]
نشریه جغرافیا و برنامهریزی, 2020 Introduction In recent decades, research on land use/land cover change has become an important aspect of global change, or global warming studies, since land use/land cover change is a major factor for global change because of its interactions with ...
Akbar Rahimi
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The 16th Hilbert problem restricted to circular algebraic limit cycles [PDF]
, 2016 Agraïments: FEDER-UNAB10-4E-378 and Consolider CSD2007-00004 "ES"We prove the following two results. First every planar polynomial vector field of degree S with S invariant circles is Darboux integrable without limit cycles.
Ramírez, Valentín +3 more
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Classification of dynamical switching regimes in a three-layered ferromagnetic nanopillar governed by spin-polarized injection current and external magnetic field. I. Longitudinal anisotropy [PDF]
Компьютерные исследования и моделирование, 2016 The mathematical model of the magnetic memory cell MRAM with the in-plane anisotropy axis parallel to the edge of a free ferromagnetic layer (longitudinal anisotropy) has been constructed using approximation of uniform magnetization.
Natalia Vladimirovna Ostrovskaya +2 more
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Non-nested configuration of algebraic limit cycles in quadratic systems [PDF]
, 2006 This work deals with algebraic limit cycles of planar polynomial differential systems of degree two. More concretely, we show among other facts that a quadratic vector field cannot possess two non-nested algebraic limit cycles contained in different ...
García, I.A. +2 more
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Limit Cycles and Invariant Curves in a Class of Switching Systems with Degree Four
Journal of Function Spaces, 2018 In this paper, a class of switching systems which have an invariant conic x2+cy2=1,c∈R, is investigated. Half attracting invariant conic x2+cy2=1,c∈R, is found in switching systems.
Xinli Li, Huijie Yang, Binghong Wang
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Quadratic systems with a symmetrical solution
Electronic Journal of Qualitative Theory of Differential Equations, 2018 In this paper we study the existence and uniqueness of limit cycles for so-called quadratic systems with a symmetrical solution: \begin{equation*} \begin{split} \frac{dx(t)}{dt}& = P_2(x,y) \equiv a_{00}+a_{10}x+a_{01}y+a_{20}x^2+a_{11}xy+a_{02}y^2 ...
Andre Zegeling, Robert Kooij
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Open Physics, 2020 This article concerns with the development of the number of focal values. We analyzed periodic solutions for first-order cubic non-autonomous ordinary differential equations. Bifurcation analysis for periodic solutions from a fine focus z=0{\mathfrak{z}}=
Akram Saima +4 more
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Algebraic limit cycles in piecewise linear differential systems
, 2021 This paper is devoted to study the algebraic limit cycles of planar piecewise linear differential systems. In particular we present examples exhibiting two explicit hyperbolic algebraic limit cycles, as well as some 1-parameter families with a saddle ...
Buzzi, Claudio. +2 more
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Dulac-Cherkas functions for generalized Liénard systems
Electronic Journal of Qualitative Theory of Differential Equations, 2011 Dulac-Cherkas functions can be used to derive an upper bound for the number of limit cycles of planar autonomous differential systems including criteria for the non-existence of limit cycles, at the same time they provide information about their ...
A. Grin, Klaus Schneider, L. Cherkas
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