UAB Digital Repository of Documents 31 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
1.
A new approach for the study of limit cycles / García Saldaña, Johanna Denise (Universidad Católica de la Santísima Concepción. Departamento de Matemática y Física Aplicadas (Chile)) ; Gasull i Embid, Armengol (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Giacomini, Hector (Centre National de la Recherche Scientifique. Institut Denis Poisson. Université de Tours (France))
We prove that star-like limit cycles of any planar polynomial system can also be seen either as solutions defined on a given interval of a new associated planar non-autonomous polynomial system or as heteroclinic solutions of a 3-dimensional polynomial system. [...]
2020 - 10.1016/j.jde.2020.04.038
Journal of differential equations, Vol. 269, Issue 7 (September 2020) , p. 6269-6292  
2.
Nilpotent global centers of linear systems with cubic homogeneous nonlinearities / García Saldaña, Johanna Denise (Universidad Católica de la Santísima Concepción. Departamento de Matemática y Física Aplicadas (Chile)) ; Llibre, Jaume (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Valls, Clàudia 1973- (Universidade de Lisboa. Instituto Superior Técnico. Departamento de Matemática)
In this paper, we characterize the global nilpotent centers of polynomial differential systems of the linear form plus cubic homogeneous terms.
2020 - 10.1142/S0218127420500108
International Journal of Bifurcation and Chaos, Vol. 30, Issue 1 (January 2020) , art. 2050010  
3.
28 p, 837.2 KB Phase portraits of Abel quadratic differential systems of second kind with symmetries / Ferragut, Antoni (Universitat Jaume I. Institut de Matemàtiques i Aplicacions de Castelló. Departament de Matemàtiques) ; García-Saldaña, Johanna D. (Universidad Católica de la Santísima Concepción. Departamento de Matemática y Física Aplicadas (Chile)) ; Valls, Clàudia 1973- (Universidade de Lisboa. Instituto Superior Técnico. Departamento de Matemática)
We provide normal forms and the global phase portraits on the Poincaré disk of the Abel quadratic differential equations of the second kind having a symmetry with respect to an axis or to the origin. [...]
2019 - 10.1080/14689367.2018.1530732
Dynamical Systems, Vol. 34, Issue 2 (2019) , p. 301-333  
4.
Linear type global centers of linear systems with cubic homogeneous nonlinearities / García Saldaña, Johanna Denise. (Universidad Católica de la Santísima Concepción. Departamento de Matemática y Física Aplicadas (Chile)) ; Llibre, Jaume (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Valls, Clàudia 1973- (Universidade de Lisboa. Instituto Superior Técnico. Departamento de Matemática)
A center p of a differential system in R2 is global if R2\ { p} is filled of periodic orbits. It is known that a polynomial differential system of degree 2 has no global centers. Here we characterize the global centers of the differential systems x˙=ax+by+P3(x,y),y˙=cx+dy+Q3(x,y),with P3 and Q3 homogeneous polynomials of degree 3, and such that the center has purely imaginary eigenvalues, i. [...]
2019 - 10.1007/s12215-019-00433-0
Rendiconti del Circolo Matematico di Palermo, (July 2019)  
5.
18 p, 641.8 KB Return to the sea, get huge, beat cancer: An analysis of Cetacean genomes including an assembly for the humpback whale (Megaptera novaeangliae) / Tollis, Marc (Northern Arizona University. School of Informatics, Computing and Cyber Systems) ; Robins, Jooke (Center for Coastal Studies (USA)) ; Webb, Andrew E. (Temple University. Center for Computational Genetics and Genomics) ; Kuderna, Lukas F.K. (Universitat Pompeu Fabra. Instituto de Biologia Evolutiva) ; Caulin, Aleah F. (University of Pennsylvania. Genomics and Computational Biology Program) ; Garcia, Jacinda D. (Arizona State University. School of Life Sciences) ; Bèrubè, Martine (University of Groningen. Groningen Institute of Evolutionary Life Sciences) ; Pourmand, Nader (University of California Santa Cruz. Jack Baskin School of Engineering) ; Marquès Bonet, Tomàs (Institut Català de Paleontologia Miquel Crusafont) ; O'Connell, Mary J. (University of Nottingham. Computational and Molecular Evolutionary Biology Research Group) ; Palsbøll, Per J. (University of Groningen. Groningen Institute of Evolutionary Life Sciences) ; Maley, Carlo C. (Arizona State University. School of Life Sciences)
Cetaceans are a clade of highly specialized aquatic mammals that include the largest animals that have ever lived. The largest whales can have ∼1,000× more cells than a human, with long lifespans, leaving them theoretically susceptible to cancer. [...]
2019 - 10.1093/molbev/msz099
Molecular biology and evolution, Vol. 36, Issue 8 (August 2019) , p. 1746-1763  
6.
19 p, 2.2 MB Rietveld quantitative phase analysis of oil well cement: in situ hydration study at 150 bars and 150 °C / Fraga, Edmundo (ALBA Laboratori de Llum de Sincrotró) ; Cuesta, Ana (Universidad de Málaga. Departamento de Química Inorgánica, Cristalografía y Mineralogía) ; Zea-Garcia, Jesus D. (Universidad de Málaga. Departamento de Química Inorgánica, Cristalografía y Mineralogía) ; Gómez De la Torre, Angeles (Universidad de Málaga. Departamento de Química Inorgánica, Cristalografía y Mineralogía) ; Yáñez Casal, Armando (Universidade da Coruña. Departamento de Ingeniería Industrial) ; García Aranda, Miguel Ángel (ALBA Laboratori de Llum de Sincrotró)
Oil and gas well cements are multimineral materials that hydrate under high pressure and temperature. Their overall reactivity at early ages is studied by a number of techniques including through the use of the consistometer. [...]
2019
Materials, Vol. 12, issue 12 (June 2019) , art. 1897  
7.
161 p, 3.2 MB Design and development of a self-powered electrochromic biosensor / Aller Pellitero, Miguel, autor. ; Campo García, Francisco Javier del, supervisor acadèmic. ; Gallardo García, Iluminada, supervisor acadèmic. ; Universitat Autònoma de Barcelona. Departament de Química
Las tendencias actuales en química analítica buscan desarrollar dispositivos de sensado más sencillos y con un coste más asequible. El uso de materiales electrocrómicos permite la fabricación de sensores electroquímicos que utilizan el cambio de color como medio para reducir la instrumentación requerida. [...]
Current trends in analytical chemistry aim at developing simpler and more affordable sensing devices. Electrochromic materials enable the fabrication of electrochemical sensors that exploit colour changes as a means to reduce instrumentation requirements. [...]

[Barcelona] : Universitat Autònoma de Barcelona, 2019.  
8.
11 p, 183.5 KB Estudio de la presencia del cuerpo en el retrato fotográfico en la obra de Javier Silva Meinel / García Contto, José David (Universidad de Lima)
Este artículo aborda el retrato fotográfico, en particular de un fotógrafo peruano (Javier Silva), y las consecuencias semióticas de ciertas alteraciones que las imágenes presentan a la estructura base del retrato. [...]
This article deals with the photo portrait, mainly the work of a Peruvian photographer (Javier Silva), and the semiotic consequences of certain alterations of the images represent to the base structure of portrait. [...]

2010
DeSignis, Núm. 16 (2010) , p. 95-105  
9.
4 p, 262.6 KB On the Homoclinic Orbits of the Lü System / Álvarez-Ramírez, Martha (Universidad Autónoma Metropolitana (Iztapalapa, Mèxic). Departamento de Matemáticas) ; García Saldaña, Johanna Denise (Universidad Católica de la Santísima Concepción (Xile). Departamento de Matemática y Física Aplicadas)
In this paper, the existence of homoclinic orbits of the equilibrium point (0, 0, 0) is demonstrated in the case of the Lu ̈ system for parameter values not reported by G. A. Leonov. In addition, some simulations are shown that agree with our theoretical analysis.
2017 - 10.1142/S0218127417500705
International journal of bifurcation and chaos in applied sciences and engineering, Vol. 27 Núm. 5 (2017) , p. 1750070  
10.
13 p, 358.8 KB Detection of special curves via the double resultant / Ferragut, Antoni (Universitat Jaume I. Departament de Matemàtiques) ; García Saldaña, Johanna Denise (Universidad de Talca (Xile). Instituto de Matemática y Física) ; Gasull i Embid, Armengol (Universitat Autònoma de Barcelona. Departament de Matemàtiques)
We introduce several applications of the use of the double resultant through some examples of computation of different nature: special level sets of rational first integrals for rational discrete dynamical systems; remarkable values of rational first integrals of polynomial vector fields; bifurcation values in phase portraits of polynomial vector fields; and the different topologies of the offset of curves.
2017 - 10.1007/s12346-015-0180-x
Qualitative theory of dynamical systems, Vol. 16 (2017) , p. 101-117  

UAB Digital Repository of Documents : 31 records found   1 - 10nextend  jump to record:
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