Results 41 to 50 of about 679,323 (292)

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

Entropy, 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

Directed Animals, Quadratic Systems and Rewriting Systems [PDF]

The 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   +2 more sources

Optimal Monomial Quadratization for ODE Systems [PDF]

, 2021
Quadratization problem is, given a system of ODEs with polynomial right-hand side, transform the system to a system with quadratic right-hand side by introducing new variables. Such transformations have been used, for example, as a preprocessing step by model order reduction methods and for transforming chemical reaction networks.
Bychkov, Andrey, Pogudin, Gleb
openaire   +2 more sources

Biopsychosocial determinants of hand function and its trajectories over five years in patients with hand osteoarthritis

Arthritis Care &Research, Accepted Article.
Objectives This study aimed to investigate hand function trajectories over 5 years in primary hand osteoarthritis. Additionally, determinants of baseline and longitudinal hand function were assessed. Methods 538 patients with both baseline and 5‐year study visits were analyzed.
Annemiek V.E.M. Olde Meule, Coen van der Meulen, Jos Runhaar, Frits R. Rosendaal, Margreet Kloppenburg   +4 more
wiley   +1 more source

Economic modeling of mechanized and semi-mechanized rainfed wheat production systems using multiple linear regression model

Information Processing in Agriculture, 2020
Mathematical modeling of economic indices is a challenging topic in crop production systems. The present study aimed to model the economic indices of mechanized and semi-mechanized rainfed wheat production systems using various multiple linear regression
Mobin Amoozad-Khalili, Reza Rostamian, Mahdi Esmaeilpour-Troujeni, Armaghan Kosari-Moghaddam   +3 more
doaj   +1 more source

Solutions of certain quaternary quadratic systems [PDF]

Pacific Journal of Mathematics, 1984
have been studied by 1 given a basic solution for k = 1. Finally in §7 we apply the formulae in §4 to illustrate the Hudson-Williams-Buell extension of a theorem of Cauchy and Jacobi (see [15]).
Buell, Duncan A., Hudson, Richard H.
openaire   +3 more sources

Discordance Between Patient and Physician Global Assessments in Early Systemic Sclerosis

Arthritis Care &Research, EarlyView.
Objective This study aims to identify factors associated with patient global assessment (PtGA) and physician global assessment (PhGA) and discordance between them in systemic sclerosis (SSc). Methods Data from adults with early SSc (<5 years) from the Collaborative National Quality and Efficacy Registry were included.
Ellen Romich, Alexis Ogdie, Alisa Stephens Shields, Peter A. Merkel, Shervin Assassi, Elana J. Bernstein, Andreea Bujor, Flavia V. Castelino, Lorinda Chung, Luke B. Evnin, Tracy M. Frech, Jessica K. Gordon, Melissa Griffith, Faye N. Hant, Monica L. Harding, Laura K. Hummers, Dinesh Khanna, Kimberly S. Lakin, Dorota J. Lebiedz‐Odrobina, Yiming Luo, Ashima Makol, Maureen D. Mayes, Zsuzsanna H. McMahan, Jerry Molitor, Duncan F. Moore, Julie Paik, Carrie Richardson, Brian Skaug, Ami A. Shah, Ankoor Shah, Virginia Steen, John M. VanBuren, Elizabeth R. Volkmann, Carleigh Zahn, Nora Sandorfi, for the CONQUER Investigators   +35 more
wiley   +1 more source

The Moduli Spaces of Parabolic Connections with a Quadratic Differential and Isomonodromic Deformations [PDF]

, 2017
In this paper, we study the moduli spaces of parabolic connections with a quadratic differential. We endow these moduli spaces with symplectic structures by using the fundamental 2-forms on the moduli spaces of parabolic connections (which are phase ...
Komyo, Arata
core   +3 more sources

A Q‐Learning Algorithm to Solve the Two‐Player Zero‐Sum Game Problem for Nonlinear Systems

International Journal of Adaptive Control and Signal Processing, Volume 39, Issue 3, Page 566-581, March 2025.
A Q‐learning algorithm to solve the two‐player zero‐sum game problem for nonlinear systems. ABSTRACT This paper deals with the two‐player zero‐sum game problem, which is a bounded L2$$ {L}_2 $$‐gain robust control problem. Finding an analytical solution to the complex Hamilton‐Jacobi‐Issacs (HJI) equation is a challenging task.
Afreen Islam, Anthony Siming Chen, Guido Herrmann   +2 more
wiley   +1 more source

Equalities and inequalities for several variables mappings

Journal 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