Resultats globals: 62 registres trobats en 0.02 segons.
Articles, 61 registres trobats
Llibres i col·leccions, 1 registres trobats
Articles 61 registres trobats  1 - 10següentfinal  anar al registre:
1.
16 p, 265.2 KB Time-reversibility and integrability of p : −q resonant vector fields / Giné, Jaume (Universitat de Lleida. Departament de Matemàtica) ; Romanovski, Valery G. (University of Maribor. Center for Applied Mathematics and Theoretical Physics) ; Torregrosa, Joan (Universitat Autònoma de Barcelona. Departament de Matemàtiques)
We study the local analytical integrability in a neighborhood of p: −q resonant singular point of a two-dimensional vector field and its connection to time-reversibility with respect to the non-smooth involution ϕ(x, y) = (yp/q, xq/p). [...]
2024 - 10.3934/math.2024005
AIMS Mathematics, Vol. 9, Issue 1 (2024) , p. 73-88  
2.
11 p, 281.1 KB Cyclicity Near Infinity in Piecewise Linear Vector Fields Having a Nonregular Switching Line / Bastos, Jefferson L. R. (Universidade Estadual Paulista. Departamento de Matemática) ; Buzzi, Claudio (Universidade Estadual Paulista. Departamento de Matemática) ; Torregrosa, Joan (Universitat Autònoma de Barcelona. Departament de Matemàtiques)
In this paper we recover the best lower bound for the number of limit cycles in the planar piecewise linear class when one vector field is defined in the first quadrant and a second one in the others. [...]
2023 - 10.1007/s12346-023-00817-9
Qualitative theory of dynamical systems, Vol. 22, Issue 4 (December 2023) , art. 125  
3.
14 p, 7.2 MB Microwave Humidity Sensor for Early Detection of Sweat and Urine Leakage / Su, Lijuan (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica) ; Vélez Rasero, Paris (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica) ; Casacuberta Orta, Pau (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica) ; Muñoz Enano, Jonathan (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica) ; Martín, Ferran (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica)
A planar microwave sensor devoted to the detection of humidity in underwear and clothes in general is proposed. The ultimate goal of the sensor is to detect the presence of liquids in fabrics, which is of interest to aid patients who suffer from certain pathologies, such as hyperhidrosis and enuresis. [...]
2023 - 10.3390/electronics12102276
Electronics, Vol. 12, Issue 10 (May 2023) , art. 2276  
4.
16 p, 396.2 KB Probability of occurrence of some planar random quasi-homogeneous vector fields / Coll, Bartomeu (Universitat de les Illes Balears. Departament de Ciències Matemàtiques i Informàtica) ; Gasull, Armengol (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Prohens, Rafel (Universitat de les Illes Balears. Departament de Ciències Matemàtiques i Informàtica)
The objective of this work is the study of the probability of occurrence of phase portraits in a family of planar quasi-homogeneous vector fields of quasi degree q, that is a natural extension of planar linear vector fields, which correspond to q= 1. [...]
2022 - 10.1007/s00009-022-02198-w
Mediterranean Journal of Mathematics, Vol. 19, Issue 6 (December 2022) , art. 278  
5.
18 p, 607.8 KB Abelian integrals and non-generic turning points / Huzak, Renato (Hasselt University (Belgium)) ; Rojas, David (Universitat de Girona. Departament d'Informàtica, Matemàtica Aplicada i Estadística)
In this paper we initiate the study of the Chebyshev property of Abelian integrals generated by a non-generic turning point in planar slow-fast systems. Such Abelian integrals generalize the Abelian integrals produced by a slow-fast Hopf point (or generic turning point), introduced in Dumortier et al. [...]
2022 - 10.1007/s12346-022-00609-7
Qualitative theory of dynamical systems, Vol. 21, Issue 3 (September 2022) , art. 77
2 documents
6.
6 p, 264.2 KB On the limit cycle of a Belousov-Zhabotinsky differential systems / Llibre, Jaume (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Oliveira, Regilene (Universidade de São Paulo. Instituto de Ciências Matemáticas e Computação.)
In Leonov and Kuznetsov (2013), the authors shown numerically the existence of a limit cycle surrounding the unstable node that system (1) has in the positive quadrant for specific values of the parameters. [...]
2022 - 10.1002/mma.7798
Mathematical methods in the applied sciences, Vol. 45, Issue 2 (January 2022) , p. 579-584  
7.
29 p, 454.1 KB On the expected number of perfect matchings in cubic planar graphs / Noy, Marc (Universitat Politècnica de Catalunya. Departament de Matemàtiques) ; Requilé, Clément (Technische Universität Wien. Institute of Discrete Mathematics and Geometry) ; Rué, Juanjo (Universitat Politècnica de Catalunya. Departament de Matemàtiques)
A well-known conjecture by Lov'asz and Plummer from the 1970s asserted that a bridgeless cubic graph has exponentially many perfect matchings. It was solved in the affirmative by Esperet et al. ([13]). [...]
2022 - 10.5565/PUBLMAT6612213
Publicacions matemàtiques, Vol. 66 Núm. 1 (2022) , p. 325-353 (Articles)  
8.
18 p, 698.2 KB The center problem for the class of Λ- Ω differential systems / Llibre, Jaume (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Ramírez, Rafael Orlando (Universitat Rovira i Virgili. Departament d'Enginyeria Informàtica i Matemàtiques) ; Ramírez, Valentín (Universitat Autònoma de Barcelona. Departament de Matemàtiques)
The center problem, i. e. distinguish between a focus and a center, is a classical problem in the qualitative theory of planar differential equations which go back to Darboux, Poincaré and Liapunov. [...]
2020 - 10.1007/s12215-020-00568-5
Rendiconti del Circolo Matematico di Palermo, vol. 70 (October 2020) p. 1483-1499  
9.
24 p, 359.3 KB Limit cycles from a monodromic infinity in planar piecewise linear systems / Freire, Emilio (Universidad de Sevilla. Departamento de Matemática Aplicada II) ; Ponce, Enrique (Universidad de Sevilla. Departamento de Matemática Aplicada II) ; Torregrosa, Joan (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Torres, Francisco (Universidad de Sevilla. Departamento de Matemática Aplicada II)
Planar piecewise linear systems with two linearity zones separated by a straight line and with a periodic orbit at infinity are considered. By using some changes of variables and parameters, a reduced canonical form with five parameters is obtained. [...]
2021 - 10.1016/j.jmaa.2020.124818
Journal of mathematical analysis and applications, Vol. 496, Issue 2 (April 2021) , art. 124818  
10.
30 p, 504.7 KB Phase portraits of random planar homogeneous vector fields / Cimà, Anna (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Gasull, Armengol (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Mañosa Fernández, Víctor 1971- (Universitat Politècnica de Catalunya. Departament de Matemàtiques)
In this paper, we study the probability of occurrence of phase portraits in the set of random planar homogeneous polynomial vector fields, of degree n. In particular, for n= 1, 2, 3, we give the complete solution of the problem; that is, we either give the exact value of each probability of occurrence or we estimate it by using the Monte Carlo method. [...]
2021 - 10.1007/s12346-020-00437-7
Qualitative theory of dynamical systems, Vol. 20, Issue 1 (April 2021) , art. 3  

Articles : 61 registres trobats   1 - 10següentfinal  anar al registre:
Llibres i col·leccions 1 registres trobats  
1.
4 p, 235.4 KB Localizing limit cycles : from numeric to analytical results / Gasull, Armengol (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Giacomini, Hector (Université de Tours (França). Laboratoire de Mathemátiques et Physique Théorique) ; Grau, Maite (Universitat de Lleida. Departament de Matemàtica)
This note presents the results of [4]. It deals with the problem of location and existence of limit cycles for real planar polynomial differential systems. We provide a method to construct Poincaré-Bendixson regions by using transversal curves, that enables us to prove the existence of a limit cycle that has been numerically detected. [...]
Cham, etc : Springer Nature Switzerland AG, cop. 2018 (Trends in mathematics. Research perspectives CRM Barcelona ; 10) - 10.1007/978-3-030-01153-6_2
Extended abstracts Summer 2016, slow-fast systems and hysteresis, theory and applications, 2015, p. 17-21  

Us interessa rebre alertes sobre nous resultats d'aquesta cerca?
Definiu una alerta personal via correu electrònic o subscribiu-vos al canal RSS.