Departament de Matemàtiques

Recent Submissions

  • Removing day-boundary discontinuities on GNSS clock estimates: methodology and results 

    Rovira Garcia, Adrià; Juan Zornoza, José Miguel; Sanz Subirana, Jaume; González Casado, Guillermo; Ventura Traveset, Javier; Cacciapuoti, Luigi; Schoenemann, Erik (2021-04)
    Article
    Open Access
    Global navigation satellite system (GNSS) satellites are equipped with very stable atomic clocks that can be used for assess-ing the models and strategies involved in the estimation processes, where the clock estimates ...

  • Valors i vectors singulars 

    Cubarsí Morera, Rafael (2015-12)
    External research report
    Restricted access - author's decision
    Descomposició en valors singulars d'una matriu.

  • Factorization and Malleability of RSA Moduli, and Counting Points on Elliptic Curves Modulo N 

    Dieulefait, Luis Victor; Jiménez Urroz, Jorge (Multidisciplinary Digital Publishing Institute (MDPI), 2020-11-27)
    Article
    Open Access
    In this paper we address two different problems related with the factorization of an RSA (Rivest–Shamir–Adleman cryptosystem) modulus N. First we show that factoring is equivalent, in deterministic polynomial time, to ...

  • Neighbor-locating colorings in graphs 

    Alcón, Liliana; Gutierrez, Marisa; Hernando Martín, María del Carmen; Mora Giné, Mercè; Pelayo Melero, Ignacio Manuel (2020-02-02)
    Article
    Restricted access - publisher's policy
    A k-coloring of a graph G is a k-partition of into independent sets, called colors. A k-coloring is called neighbor-locating if for every pair of vertices belonging to the same color , the set of colors of the neighborhood ...

  • The Geodetic Detrending technique: enabling high-accuracy navigation under scintillation 

    Rovira Garcia, Adrià; Juan Zornoza, José Miguel; Sanz Subirana, Jaume; González Casado, Guillermo
    Conference report
    Restricted access - publisher's policy
    Scintillation is a particular type of space weather perturbation occurred when the signals from the Global Navigation Satellite System (GNSS) traverse irregularities in the ionosphere; the upper layer of the Earth atmosphere. ...

  • Cohomología local con soporte un ideal monomial (D-módulos y combinatoria) 

    Álvarez Montaner, Josep (Edicions UPC, 2000)
    Conference report
    Restricted access - publisher's policy
    We study, by using the theory of algebraic D-modules, the local cohomology modules supported on a monomial ideal I of the polynomial ring R = k[x1, . . . , xn], where k is a field of characteristic zero. We compute the ...

  • Causal canonical decomposition of hysteresis systems 

    Ikhouane, Fayçal (2020-10-01)
    Article
    Restricted access - publisher's policy
    Hysteresis is a special type of behavior found in many areas including magnetism, mechanics, bi-ology, economics, etc. One of the characteristics of hysteresis systems is that they are approximatelyrate independent for ...

  • The effect of a prototype hydromulch on soil water evaporation under controlled laboratory conditions 

    Verdú González, Antoni Maria Claret; Mas Serra, Maite; Josa March, Ramon; Ginovart Gisbert, Marta (2020)
    Article
    Open Access
    Organic hydromulches can be an interesting alternative for weed control in perennial crops, but can also reduce soil water evaporation. To examine the effect of a hydromulch layer on soil water content in dry conditions ...

  • Complex-valued sliding mode control of an induction motor 

    Dòria Cerezo, Arnau; Olm Miras, Josep Maria; Repecho del Corral, Víctor; Biel Solé, Domingo (2020)
    Conference report
    Restricted access - publisher's policy
    Three-phase induction motors admit a complex-valued space state representation. In this paper, this complex description is used to design a torque controller and a rotor flux observer based on sliding modes. The advantage ...

  • New contributions to the Hamiltonian and Lagrangian contact formalisms for dissipative mechanical systems and their symmetries 

    Gaset Rifà, Jordi; Gràcia Sabaté, Francesc Xavier; Muñoz Lecanda, Miguel Carlos; Rivas Guijarro, Xavier; Román Roy, Narciso (2020-06-01)
    Article
    Restricted access - publisher's policy
    We provide new insights into the contact Hamiltonian and Lagrangian formulations of dissipative mechanical systems. In particular, we state a new form of the contact dynamical equations, and we review two recently presented ...

  • Galileo characterization as Input to H-ARAIM and SBAS DFMC 

    Brieden, Phillip; Wallner, Stefan; Sanz Subirana, Jaume; Rovira Garcia, Adrià; Alonso Alonso, María Teresa; Baur, Oliver; Lauria, Domenico; Kirchner, Michael; Cosson, Fabrice; Spinelli, Enrico; Martini, Ilaria (2019)
    Conference report
    Restricted access - publisher's policy
    The characterization of Galileo Open Service signal-in-space (SiS) represents an essential input to Safety-of-Life (SoL) applications like Horizontal ARAIM (Advanced Receiver Autonomous Integrity Monitoring) and SBAS ...

  • Gender mainstreaming in teaching: analysis of STEM students' perception 

    Mas de les Valls Ortiz, Elisabet; Alsina Aubach, Montserrat; Ventura, Mireia; Lusa García, Amaia (2020)
    Conference lecture
    Restricted access - publisher's policy
    The Universitat Politècnica de Catalunya, UPC-BarcelonaTech (UPC), is currently doing significant steps towards the gender mainstreaming in teaching. Indeed, some years ago some teachers already started individually to ...

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