Results 31 to 40 of about 213,155 (287)

Phase portraits of generalf(T) cosmology [PDF]

Journal of Cosmology and Astroparticle Physics, 2018
39 pages, 12 figures, version published in ...
Awad, A., El Hanafy, W., Nashed, G. G.L., Saridakis, Emmanuel N.   +3 more
openaire   +3 more sources

The phase portrait of the Hamiltonian system associated to a Pinchuk map

Anais da Academia Brasileira de Ciências
In this paper we describe the global phase portrait of the Hamiltonian system associated to a Pinchuk map in the Poincaré disc. In particular, we prove that this phase portrait has 15 separatrices, five of them singular points, and 7 canonical regions ...
JOAN CARLES ARTÉS, FRANCISCO BRAUN, JAUME LLIBRE   +2 more
doaj   +1 more source

Rare Events Statistics in Reaction--Diffusion Systems

, 2004
We develop an efficient method to calculate probabilities of large deviations from the typical behavior (rare events) in reaction--diffusion systems.
A. Kamenev, A. Okubo, Alex Kamenev, C. W. Gardiner, D. Mollison, J. D. Murray, J. Marro, J. Zinn-Justin, L. Peliti, N. G. Van Kampen, P. Grassberger, T. M. Liggett, V. I. Arnold, V. Volterra, Vlad Elgart, Yu. V. Nazarov   +15 more
core   +1 more source

Phase Portraits of Planar Semi-Homogeneous Vector Fields (III) [PDF]

Qualitative Theory of Dynamical Systems, 1997
The authors study phase-portraits of semi-homogeneous plane vector fields of degrees \(1\) and \(3\), \[ \dot x= ax+ by,\quad \dot y= Ax^3+ Bx^2y+ Cxy^2+ Dy^3,\tag{1} \] with \(|a|+|b|\neq 0\) and \(|A|+|B|+|C|+|D|\neq 0\), and having only finitely many critical points.
Cairó, Laurent, Llibre, Jaume
openaire   +2 more sources

The phase portrait of a matter bounce in Horava-Lifshitz cosmology

, 2010
The occurrence of a bounce in FRW cosmology requires modifications of general relativity. An example of such a modification is the recently proposed Horava-Lifshitz theory of gravity, which includes a ``dark radiation'' term with a negative coefficient ...
Bakas I, Belinskii V A, Blas D, Bogdanos C, Bogdanos C, Calcagni G, Carloni S, Carloni S Elizalde E Silva P J, Charmousis C, da Silva A M, Damour T, E Czuchry, Felder G N, Gao X, Germani C, Horava P, Iengo R, Leon G, Li M, Maartens R, Mukohyama S, Nastase H, Rama S K, Saridakis E N, Sindoni L, Sotiriou T P, Sotiriou T P, Wang A   +27 more
core   +1 more source

Bifurcations of phase portraits of pendulum with vibrating suspension point [PDF]

, 2016
We consider a simple pendulum whose suspension point undergoes fast vibrations in the plane of motion of the pendulum. The averaged over the fast vibrations system is a Hamiltonian system with one degree of freedom depending on two parameters.
Neishtadt, Anatoly, Sheng, Kaicheng
core   +2 more sources

Design Strategies and Emerging Applications of High‐Performance Flexible Piezoresistive Pressure Sensors

Advanced Functional Materials, EarlyView.
Flexible piezoresistive pressure sensors underpin wearable and soft electronics. This review links sensing physics, including contact resistance modulation, quantum tunneling and percolation, to unified materials/structure design. We highlight composite and graded architectures, interfacial/porous engineering, and microstructured 3D conductive networks
Feng Luo, Artur Ciesielski, Paolo Samorì   +2 more
wiley   +1 more source

Structurally unstable quadratic vector fields of codimension two: families possessing a finite saddle-node and an infinite saddle-node

Electronic Journal of Qualitative Theory of Differential Equations, 2021
In 1998, Artés, Kooij and Llibre proved that there exist 44 structurally stable topologically distinct phase portraits modulo limit cycles, and in 2018 Artés, Llibre and Rezende showed the existence of at least 204 (at most 211) structurally unstable ...
Joan Artés, Marcos Mota, Alex Rezende
doaj   +1 more source

Analysis of Non-Linear Probabilistic Hybrid Systems

, 2011
This paper shows how to compute, for probabilistic hybrid systems, the clock approximation and linear phase-portrait approximation that have been proposed for non probabilistic processes by Henzinger et al.
Assouramou, Joseph, Desharnais, Josée
core   +2 more sources

Small Extracellular Vesicles from Neural Cells: Physiological and Pathological Roles, and Potential in Neurodegenerative Therapy

Advanced Healthcare Materials, EarlyView.
Neural cell–derived small extracellular vesicles (sEVs) are emerging as pivotal mediators in neurodegenerative diseases, exerting both pathogenic and therapeutic functions. This review synthesizes current evidence on how sEVs from distinct neural cell types regulate neurodegeneration, neuroprotection, biomarker discovery, and targeted drug delivery ...
Muhammad Waqas Salim, Wei Zhang, Lyndsey Collins‐Praino, Yuling Wang, Andrew Care   +4 more
wiley   +1 more source