Results 41 to 50 of about 399 (175)
Centering conditions for planar septic systems
Electronic Journal of Differential Equations, 2003 We find centering conditions for the following $O$-symmetric system of degree 7: $$displaylines{ dot x=y+ x (H_2 (x,y)+H_6 (x,y)),cr dot y=-x+ y (H_2 (x,y)+H_6 (x,y)), }$$ where $H_2 (x,y)$ and $H_6 (x,y)$ are homogeneous polynomials of degrees 2 and 6 ...
Evgenii P. Volokitin
doaj
Isochronicity and linearizability of planar polynomial Hamiltonian systems
, 2021 Agraïments: UNAB13-4E-1604. The second author is supported by the Slovenian Research Agency. Both authors are supported by the grant FP7-PEOPLE-2012-IRSES-316338.
Llibre, Jaume, Romanovskii, Valery G.
core
Isochronous spacetimes and cosmologies
Journal of Physics: Conference Series, 2015 It is shown, in the context of general relativity, how to modify any cosmological model so that its local (in time) properties are unchanged, but its global time evolution is isochronous, i. e. completely periodic with a fixed period independent of the initial data.
Briscese F., Calogero F.
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Non-isochronicity on piecewise Hamiltonian differential systems with homogeneous nonlinearities [PDF]
In this paper we prove the non-isochronicity of $\Sigma$-centers for a class of planar piecewise smooth differential systems with a straight switching line, whose two sub-systems are Hamiltonian differential systems with a non-degenerated center and only
Chen, Xiaoyi, Dong, Guangfeng
core +1 more source
Branching of periodic orbits from Kukles isochrones
Electronic Journal of Differential Equations, 1998 We study local bifurcations of limit cycles from isochronous (or linearizable) centers. The isochronicity has been determined using the method of Darboux linearization, which provides a birational linearization for the examples that we analyze.
B. Toni
doaj
, 2006 Recently – via a simple trick, amounting essentially to a change of independent, and possibly as well of dependent, variables – the possibility has been noted to modify a quite general evolution system so that the modified system possess a lot of completely periodic, indeed isochronous, solutions.
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Journal of Cachexia, Sarcopenia and Muscle, Volume 16, Issue 2, April 2025.ABSTRACT Background β2‐Microglobulin (B2M) has garnered considerable interest as a potential pro‐ageing factor, leading to speculation about its involvement in muscle metabolism and the development of sarcopenia, a key component of ageing phenotypes.
Shibo Wei +13 more
wiley +1 more source
Journal of Morphology, Volume 286, Issue 2, February 2025.We devised novel staging criteria for near‐hatching embryos of the Mallard (Anas platyrhynchos) and Swan Goose (Anser cygnoides) based on four easily measurable morphological traits. We show that our staging criteria are robust against interbreed variation and allow for correct stage identification with over 70% accuracy.
Bassel Arnaout +3 more
wiley +1 more source
Quasi-isochronous storage rings [PDF]
Physical Review E, 1993 A study is made of the single-particle dynamics of an electron-positron storage ring where the phase-slip factor is made small in order to make the ring nearly isochronous and reduce the bunch length. What is found is that a quasi-isochronous ring makes it possible to obtain a bunch length in the millimeter range, about one order of magnitude shorter ...
Robin, David +3 more
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Maglev train levitation control via tracking differentiator with small phase lag
IET Control Theory &Applications, Volume 19, Issue 1, January/December 2025.This work proposes an enhanced tracking differentiator to ensure a small phase lag in both filtering and differential signals, The favourable characteristic is obtained by including the system damping and the amplitude factor into the control algorithm that is applied to construct the differentiator. Abstract The levitation control system is a critical
Louyue Zhang +3 more
wiley +1 more source