Results 61 to 70 of about 1,912 (198)
Renormalization group and isochronous oscillations
, 2011 We show how the condition of isochronicity can be studied for two dimensional systems in the renormalization group (RG) context. We find a necessary condition for the isochronicity of the Cherkas and another class of cubic systems.
A. Ghose Choudhury +24 more
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, 2012 We describe the rare-RI (radioactive isotope) ring at the RI Beam Factory (RIBF). The main purpose of the rare-RI ring is to measure the mass of very neutron-rich nuclei, the production rates of which are very small (hence ‘rare RI’) and the lifetimes of
Ozawa A. +3 more
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, 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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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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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
, 2000 We consider the class of autonomous systems $\dot x=f(x)$, where $x \in {\bf R}^{2n}$, $f \in C^1({\bf R}^{2n})$ whose phase portrait is a Cartesian product of $n$ two-dimensional {\em centres}. We also consider perturbations of this system, namely $\dot
Ilyin, Yuri A.
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Toward precision mass measurements of neutron-rich nuclei relevant to $r$-process nucleosynthesis
, 2015 The open question of where, when, and how the heavy elements beyond iron enrich our Universe has triggered a new era in nuclear physics studies.\ Of all the relevant nuclear physics inputs, the mass of very neutron-rich nuclides is a key quantity for ...
Litvinov, Yu. A. +3 more
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Isochron translation and a geological criterion to declare an isochron
Journal of the Geological Society of Sri Lanka, 2020 Isochron is an equal-age line for measured present-day parent and daughter isotopic ratios of co-genetic minerals and rocks plotted on an isochron diagram. Isochrons provide ages and initial isotopic ratios of the samples useful to understand their geological evolution. However, the statistical criterion used to declare an isochron cannot guarantee the
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Characterizing isochronous points and computing isochronous sections
Journal of Mathematical Analysis and Applications, 2009 We consider two-dimensional autonomous systems of differential equations $$\dot{x}=-y+\lambda x+P(x,y),\qquad \dot{y}=x+\lambda y+Q(x,y),$$ where $\lambda$ is a real constant and $P$ and $Q$ are smooth functions of order greater than or equal to two. These systems, so-called centre-focus type systems, have either a centre or a focus at the origin.
Algaba Durán, Antonio +1 more
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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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