Results 31 to 40 of about 165 (122)
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
Solvable Nonlinear Evolution PDEs in Multidimensional Space
Symmetry, Integrability and Geometry: Methods and Applications, 2006 A class of solvable (systems of) nonlinear evolution PDEs in multidimensional space is discussed. We focus on a rotation-invariant system of PDEs of Schrödinger type and on a relativistically-invariant system of PDEs of Klein-Gordon type.
Francesco Calogero, Matteo Sommacal
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.
openaire +5 more sources
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
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
openaire +2 more sources
Optical Activity and Phase Transformations in γ/β Ga2O3 Bilayers Under Annealing
Advanced Optical Materials, Volume 12, Issue 29, October 15, 2024.The polymorphic Ga2O3 structures consisting of the cubic defective spinel (γ) film on the top of the monoclinic (β) substrate are fabricated by disorder‐induced ordering. A two‐stage annealing kinetics is demonstrated in such bilayers associated with the epitaxial γ‐to‐β regrowth at the interface at temperatures below 700 °C and a non‐planar γ‐to‐β ...
Alexander Azarov +6 more
wiley +1 more source
Basin Research, Volume 36, Issue 4, July–August 2024.Spatiotemporal evolution of the Nile delta during the Pliocene‐Quaternary. This study provide the first well record of the 100 s‐m‐thick Plio‐Quaternary deep Levant Basin section. This paper shows that Sand–shale ratio inferred from Gamma Ray logs illustrates changes in terrigenous supply into the Levant basin.
Ido Sirota +2 more
wiley +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
Language and Linguistics Compass, Volume 18, Issue 2, March/April 2024.Abstract While many theoretical proposals about the relationship between language and music processing have been proposed over the past 40 years, recent empirical advances have shed new light on this relationship. Many features are shared between language and music, inspiring research in the fields of linguistic theory, systematic musicology, and ...
Katerina Drakoulaki +4 more
wiley +1 more source
NMR in Biomedicine, Volume 37, Issue 3, March 2024.HOBS and PSYCHE are robust and easy to implement pure shift (PS) experiments to identify metabolites in urine and serum. Strong coupling artefacts contain latent connectivity information that can be used to enhance metabolite identification. PS experiments can be included in metabolite identification workflows, providing additional capability for ...
Jose Ivan Serrano‐Contreras +5 more
wiley +1 more source