Results 71 to 80 of about 20,223 (242)

Stability and Bifurcations in a Discrete-Time Eco-Evolutionary Logistic Model

Mathematics
In this paper I study a two-dimensional discrete-time evolutionary logistic-type model describing the coupled dynamics of population density and a continuously evolving trait.
Rafael Luís
doaj   +1 more source

Nonlinear lattice model of viscoelastic Mode III fracture

, 2000
We study the effect of general nonlinear force laws in viscoelastic lattice models of fracture, focusing on the existence and stability of steady-state Mode III cracks.
A. Paskin, D. A. Kessler, D. A. Kessler, D. A. Kessler, D. A. Kessler, D. Holland, David A. Kessler, E. Brener, E. Sharon, E. Sharon, Herbert Levine, J. A. Hauch, J. Fineberg, J. Fineberg, J. Fineberg, J. S. Langer, L. I. Slepyan, M. Marder, M. Marder, O. Pla, P. Gumbsch, S. J. Zhou, Sh. A. Kulamekhtova   +22 more
core   +1 more source

Description of the skull, braincase, and dentition of Moschognathus whaitsi (Dinocephalia, Tapinocephalia), and its palaeobiological and behavioral implications

The Anatomical Record, EarlyView.
Abstract A subadult Moschognathus whaitsi from the Eastern Cape Province, South Africa, was scanned using synchrotron radiation X‐ray computed tomography (SRXCT). Its subadult state allowed the cranial bones and teeth to be identified and individually reconstructed in 3D.
Tristen Lafferty, Luke A. Norton, Aliénor Duhamel, Julien Benoit   +3 more
wiley   +1 more source

A detailed redescription of a skeletally immature ‘Redondasaurus’ suggests ontogenetic transformations in the taxon mirror phytosaurian morphological evolution

The Anatomical Record, EarlyView.
Abstract The study of morphological evolution is fundamentally tied to ontogeny, yet studies of these heterochronic processes in the fossil record are rare. Fossils belonging to an ontogenetic series are difficult to assign to an ontogenetic stage due to inconsistent proxies for skeletal ages, challenging to taxonomically assign due to morphological ...
Erika R. Goldsmith, Michelle R. Stocker
wiley   +1 more source

Global Period-Doubling Bifurcation of Quadratic Fractional Second Order Difference Equation

Discrete Dynamics in Nature and Society, 2014
We investigate the local stability and the global asymptotic stability of the difference equation xn+1=αxn2+βxnxn-1+γxn-1/Axn2+Bxnxn-1+Cxn-1, n=0,1,… with nonnegative parameters and initial conditions such that Axn2+Bxnxn-1+Cxn-1>0, for all n≥0.
Senada Kalabušić, M. R. S. Kulenović, M. Mehuljić   +2 more
doaj   +1 more source

Stochastic Hopf–Hopf bifurcation of two-species discrete coupling logistic system with symbiotic interaction

Advances in Difference Equations, 2020
In this paper, stochastic Hopf–Hopf bifurcation of the discrete coupling logistic system with symbiotic interaction is investigated. Firstly, orthogonal polynomial approximation of discrete random function in the Hilbert spaces is applied to reduce the ...
Maosong Yang, Shaojuan Ma
doaj   +1 more source

The skeleton of the green Iguana iguana (Squamata: Iguanidae) and its intraspecific morphological variation

The Anatomical Record, EarlyView.
Abstract The green iguana (Iguana iguana) is an iguanine lizard with herbivorous and arboreal habits, whose distribution spans through South America, Central America to the south of North America. Although the genus Iguana is well‐known, the species still lacks a comprehensive and up‐to‐date anatomical study, particularly addressing the axial skeleton,
Vieno Rosa, Marcos Vinícius Coelho, Camila Cupello   +2 more
wiley   +1 more source

Effect of neutral modes on the order of a transition

Comptes Rendus. Mécanique, 2020
Neutral modes related to spontaneous broken symmetries at the onset of a pattern-forming instability can strongly modify the nature of secondary instabilities of the pattern.
Fauve, Stéphan
doaj   +1 more source

Long‐Term Outcomes Following Anatomic Double‐Bundle Versus Single‐Bundle Anterior Cruciate Ligament Reconstruction Using Hamstring Autograft: A Randomized Controlled Trial With an Average 14‐Year Follow‐Up

Arthroscopy, EarlyView.
Purpose To compare the clinical and radiographic outcomes—particularly the long‐term development of osteoarthritis—14 years after anterior cruciate ligament (ACL) reconstruction between anatomic double‐bundle (DB) and anatomic single‐bundle (SB) techniques.
Dlshad Qadir, Ninni Sernert, Lars Rostgard‐Christensen, Neel Desai, Mattias Ahldén, Jüri‐Toomas Kartus, Ioannis Karikis   +6 more
wiley   +1 more source

Chaos of Exponential Logistic Map

Discrete Dynamics in Nature and Society
In this paper, chaos of a new exponential logistic map modulated by Gaussian function is investigated. Firstly, the stability of the fixed point is analyzed, and the occurrence of period doubling bifurcation in the system is verified theoretically ...
Li Zhang, Wenhui Yu, Shilong Gao
doaj   +1 more source