Results 51 to 60 of about 9,238,134 (300)

On ABCD algebras and associative Yang-Baxter equations

open access: yesNuclear Physics B
In the present paper we consider the usage of associative Yang-Baxter equations in the theory of classical and quantum ABCD algebras [1]. Classical and quantum associative analogs of the generalized Fredel-Maillet equations for ABCD tensors [2, 3] are ...
T. Skrypnyk
doaj   +1 more source

A Class of Quadratic Polynomial Chaotic Maps and Their Fixed Points Analysis

open access: yesEntropy, 2019
When chaotic systems are used in different practical applications, such as chaotic secure communication and chaotic pseudorandom sequence generators, a large number of chaotic systems are strongly required.
Chuanfu Wang, Qun Ding
doaj   +1 more source

A Simplified Laminar Flow Model for the Pultrusion of Glass Fiber/Polyethylene Terephthalate Commingled Yarns

open access: yesAdvanced Engineering Materials, EarlyView.
A simplified thermoplastic pultrusion model is developed to predict thermal fields in glass fiber/polyethylene terephthalate (GF/PET) composites with reduced computational cost. By combining effective material homogenization, validation against literature data, and Gaussian‐process‐based optimization, the study reveals how heating limits, pulling speed,
Elder Soares   +3 more
wiley   +1 more source

Higher-order linear lossless systems

open access: yes, 2008
We define a lossless autonomous system as one having a quadratic differential form associated with it called the total energy, which obeys the property of positivity and which is conserved.
Rao, Shodhan, Rapisarda, Paolo
core   +2 more sources

Complete residue systems in the quadratic domain Z(e2πi/3)

open access: yesInternational Journal of Mathematics and Mathematical Sciences, 1978
Several representations for a complete residue system in the Euclidean domain Z(ω) are presented in this paper.
Gerald E. Bergum
doaj   +1 more source

Global configurations of singularities for quadratic differential systems with exactly three finite singularities of total multiplicity four

open access: yesElectronic Journal of Qualitative Theory of Differential Equations, 2015
In this article we obtain the geometric classification of singularities, finite and infinite, for the two subclasses of quadratic differential systems with total finite multiplicity $m_f=4$ possessing exactly three finite singularities, namely: systems ...
Joan Artés   +3 more
doaj   +1 more source

Equalities and inequalities for several variables mappings

open access: yesJournal of Inequalities and Applications, 2022
In this paper, some special mappings of several variables such as the multicubic and the multimixed quadratic–cubic mappings are introduced. Then, the systems of equations defining a multicubic and a multimixed quadratic–cubic mapping are unified to a ...
Abasalt Bodaghi
doaj   +1 more source

Directed Animals, Quadratic Systems and Rewriting Systems [PDF]

open access: yesThe Electronic Journal of Combinatorics, 2012
A directed animal is a percolation cluster in the directed site percolation model. The aim of this paper is to exhibit a strong relation between the problem of computing the generating function G of directed animals on the square lattice, counted according to the area and the perimeter, and the problem of solving a system of quadratic equations ...
openaire   +3 more sources

Flexural Behavior of 3D‐Printed Porous Bouligand‐Structured Polymers: Influence of Pitch Angle and Porosity

open access: yesAdvanced Engineering Materials, EarlyView.
This study examines how helicoidal architectures with different porosities respond to bending. Adjusting layer angle and spacing in 3D‐printed polymers reveals clear tradeoffs between stiffness, strength, and energy absorption. Experiments and simulations highlight designs that distribute stress effectively, offering pathways for optimizing lightweight
Praveenkumar Subhash Patil   +2 more
wiley   +1 more source

Stochastic linear quadratic control problem of switching systems with constraints

open access: yesJournal of Inequalities and Applications, 2016
This paper is devoted to the optimal control problem for stochastic linear switching systems with a quadratic cost functional. A necessary and sufficient condition of optimality for mentioned linear control systems under endpoint constraints is obtained.
Charkaz Aghayeva
doaj   +1 more source

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