Resultados globales: 16 registros encontrados en 0.02 segundos.
Artículos, Encontrados 15 registros
Documentos de investigación, Encontrados 1 registros
Artículos Encontrados 15 registros  1 - 10siguiente  ir al registro:
1.
11 p, 310.2 KB Periodic motion in non-axially symmetric galaxies / Llibre, Jaume (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Vidal, Claudio (Universidad del Bío-Bío. Departamento de Matemática)
We apply the averaging theory for proving the existence of twelve families of periodic orbits in a three-dimensional galactic Hamiltonian system.
2019 - 10.1016/j.geomphys.2018.09.023
Journal of geometry and physics, Vol. 140 (June 2019) , p. 1-9  
2.
31 p, 377.5 KB Back-and-forth systems for fuzzy first-order models / Dellunde i Clavé, Pilar (Universitat Autònoma de Barcelona. Departament de Filosofia) ; García-Cerdaña, Àngel (Institut d'Investigació en Intel·ligència Artificial) ; Noguera, Carles (Akademie věd České republiky)
This paper continues the study of model theory for fuzzy logics by addressing the fundamental issue of classifying models according to their first-order theory. Three different definitions of elementary equivalence for fuzzy first-order models are introduced and separated by suitable counterexamples. [...]
2018 - 10.1016/j.fss.2018.01.016
Fuzzy sets and systems, Vol. 345 (2018) , p. 83-98  
3.
9 p, 334.3 KB Hopf periodic orbits for a ratio-dependent predator-prey model with stage structure / Llibre, Jaume (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Vidal, Claudio (Universidad del Bio Bio (Chile). Departamento de Matemática)
A ratio–dependent predator-prey model with stage structure for prey was investigated in [8]. There the authors mentioned that they were unable to show if such a model admits limit cycles when the unique equilibrium point E ∗ at the positive octant is unstable. [...]
2016 - 10.3934/dcdsb.2016026
Discrete and Continuous Dynamical Systems. Series B, Vol. 21 Núm. 6 (2016) , p. 1859-1867  
4.
11 p, 588.8 KB The carbon bonus of organic nitrogen enhances nitrogen use efficiency of plants / Franklin, Oskar (International Institute for Applied Systems Analysis) ; Cambui, Camila Aguetoni (Umeå Plant Science Centre) ; Gruffman, Linda (Sveriges lantbruksuniversitet. Institutionen för skogens ekologi och skötsel) ; Palmroth, Sari (Nicholas School of the Environment and Earth Sciences (Duke University)) ; Oren, Ram (Nicholas School of the Environment and Earth Sciences (Duke University)) ; Näsholm, Torgny (Umeå Plant Science Centre)
The importance of organic nitrogen (N) for plant nutrition and productivity is increasingly being recognized. Here we show that it is not only the availability in the soil that matters, but also the effects on plant growth. [...]
2017 - 10.1111/pce.12772
Plant, cell & environment, Vol. 40, issue 1 (Jan. 2017) , p. 25-35  
5.
28 p, 370.2 KB Löwenheim-Skolem theorems for non-classical first-order algebraizable logics / Dellunde i Clavé, Pilar (Universitat Autònoma de Barcelona) ; García-Cerdaña, Àngel (Institut d'Investigació en Intel·ligència Artificial) ; Noguera, Carles (Akademie věd České republiky)
This article is a contribution to the model theory of non-classical first-order predicate logics. In a wide framework of first-order systems based on algebraizable logics, we study several notions of homomorphisms between models and find suitable definitions of elementary homomorphism, elementary substructure and elementary equivalence. [...]
2016 - 10.1093/jigpal/jzw009
Logic journal of the IGPL, Vol. 24, núm. 3 (2016) , p. 321-345  
6.
18 p, 190.1 KB On elementary equivalence in fuzzy predicate logics / Dellunde i Clavé, Pilar (Universitat Autònoma de Barcelona) ; Esteva Massaguer, Francesc (Institut d'Investigació en Intel·ligència Artificial)
Our work is a contribution to the model theory of fuzzy predicate logics. In this paper we characterize elementary equivalence between models of fuzzy predicate logic using elementary mappings. Refining the method of diagrams we give a solution to an open problem of Hájek and Cintula (J Symb Log 71(3):863–880, 2006, Conjectures 1 and 2). [...]
2013 - 10.1007/978-3-642-14049-5_76
Archive for Mathematical Logic, Vol. 52, núm. 1 (2013) , p. 1-17  
7.
19 p, 517.6 KB A model-to-model analysis of Bertrand competition / Vilà, Xavier (Vilà Carnicero)
This paper studies a version of the classical Bertrand model in which consumers exhibit some strategic behavior when deciding from what seller they will buy. We use two related but different tools. Both consider a probabilistic learning (or evolutionary) mechanism, and in the two of them consumers' behavior influences the competition between the sellers. [...]
2008
Journal of artificial societies and social simulation, Vol. 11 Núm. 2 (2008) , p. 185-205  
8.
20 p, 150.4 KB Equality-free saturated models / Dellunde i Clavé, Pilar (Universitat Autònoma de Barcelona. Departament de Filosofia)
2003
Reports on Mathematical Logic, Vol. 37 (2003) , p. 3-22  
9.
13 p, 261.4 KB Lo real y lo virtual, 100 años después de Einstein : ¿Vigencia del experimento mental en Mach o vuelta al Kant postcrítico? (Un debate entre Sorensen y Kühne) / Ortiz de Landázuri, Carlos (Universidad de Navarra)
Reconstructed the current debate over the real necessity or the virtual possibility, of multifactorial conditions in Einstein's thought experiments of the special and general theory of relativity, according to Soresen and Kühne.
Se reconstruye el reciente debate sobre la necesidad real o la posibilidad virtual, de las condiciones multifactoriales que sucesivamente Einstein dedujo del método del experimento mental en la teoría especial y generalizada de la relatividad, siguiendo las interpretaciones contrapuestas de Sorensen y Kühne.

2008
Ontology studies, Núm. 8 (2008) , p. 219-230  
10.
13 p, 257.5 KB El treball en xarxa : un model de recerca i acció participativa per promoure la cooperació de les famílies / Comellas, María Jesús, 1943- (Universitat Autònoma de Barcelona. Departament de Pedagogia Aplicada)
En aquest article es presenta un projecte de recerca i acció participativa a partir de la creació de xarxes socials per promoure la participació de les famílies i dels agents socials de la comunitat amb l'objectiu de cohesionar el debat i les accions educatives en els municipis, en el marc del model ecològic. [...]
En este artículo se presenta un proyecto de investigación y acción participativa a partir de la creación de redes sociales para promover la participación de las familias y de los agentes sociales con el objetivo de cohesionar el debate y las acciones educativas en los municipios, en el marco del modelo ecológico. [...]
An Active Participant Research project is presented that is based on the creation of Social networks to promote the participation of the community's families and social agents in order to make educational actions and debate in municipalities more cohesive, as part of the ecological model. [...]

2010
Educar, Núm. 45 (2010) , p. 117-129  

Artículos : Encontrados 15 registros   1 - 10siguiente  ir al registro:
Documentos de investigación Encontrados 1 registros  
1.
12 p, 286.3 KB Fuzzy positive primitive formulas / Dellunde i Clavé, Pilar (Universitat Autònoma de Barcelona)
Can non-classical logic contribute to the analysis of complexity in computer science? In this paper, we give an step towards the solution of this open problem, taking a logical model-theoretic approach to the analysis of complexity in fuzzy constraint satisfaction. [...]
2018  

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