Recent Submissions

  • Bielliptic modular curves X-0*(N) 

    Bars Cortina, Francesc; González Rovira, Josep (2020-10-01)
    Article
    Open Access
    Let N = 1 be a integer such that the modular curve X* 0 (N) has genus = 2. We prove that X* 0 (N) is bielliptic exactly for 69 values of N. In particular, we obtain that X* 0 (N) is bielliptic over the base field for all ...
  • On some local cohomology spectral sequences 

    Álvarez Montaner, Josep; Boix, Alberto F.; Zarzuela Armengou, Santiago (2020)
    Article
    Restricted access - publisher's policy
    We introduce a formalism to produce several families of spectral sequences involving the derived functors of the limit and colimit functors over a finite partially ordered set. The 1st type of spectral sequences involves ...
  • Temperature prediction model in the main ventilation system of an underground mine 

    Bascompta Massanes, Marc; Rossell Garriga, Josep Maria; Sanmiquel Pera, Lluís; Anticoi Sudzuki, Hernán Francisco (Multidisciplinary Digital Publishing Institute, 2020-10-16)
    Article
    Open Access
    A model to forecast the underground temperature in a mine ventilation circuit was developed on the basis of a case study and actual data describing temperature, airflow, and drift length collected over several years. A ...
  • Space-time Schrödinger symmetries of a post-Galilean particle 

    Batlle Arnau, Carles; Gomis Torné, Joaquin (Springer, 2020-08-07)
    Article
    Open Access
    We study the space-time symmetries of the actions obtained by expanding the action for a massive free relativistic particle around the Galilean action [1]. We obtain all the point space-time symmetries of the post-Galilean ...
  • An alternative approach to generalized Pythagorean scales: generation and properties derived in the frequency domain 

    Cubarsí Morera, Rafael (2020-03-05)
    Article
    Restricted access - publisher's policy
    Abstract scales are formalized as a cyclic group of classes of projection functions related to iterations of the scale generator. Their representatives in the frequency domain are used to built cyclic sequences of tone ...
  • Aristarc de Samos, el geòmetra que va mesurar l'univers 

    Massa Esteve, Maria Rosa (Societat Catalana de Matemàtiques (SCM), 2020-02)
    Article
    Open Access
    En aquest article després de la presentació biogràfica d'Aristarc de Samos, s'analitzen les demostracions que va emprar a la seva obra per trobar les mides i les distàncies del Sol i la Lluna.
  • Equivalent characterizations of the spectra of graphs and applications to measures of distance-regularity 

    Fiol Mora, Miquel Àngel; Fàbrega Canudas, José; Diego Gutiérrez, Víctor (2020-09)
    Article
    Open Access
    The spectrum of a graph usually provides a lot of information about its combinatorial structure. Moreover,from the spectrum, the so-called predistance polynomials can be defined, as a generalization, for any graph, of the ...
  • The dynamics of digits: calculating Pi with Galperin's billiards 

    Aretxabaleta, Xabier M.; Gonchenko, Marina; Harshman, Nathan L.; Jackson, Steven Glenn; Olshanii, Maxim; Astrakharchik, Grigori (Multidisciplinary Digital Publishing Institute (MDPI), 2020-04-01)
    Article
    Open Access
    In Galperin billiards, two balls colliding with a hard wall form an analog calculator for the digits of the number p . This classical, one-dimensional three-body system (counting the hard wall) calculates the digits of p ...
  • Fusing hotel ratings and reviews with hesitant terms and consensus measures 

    Nguyen, Jennifer; Montserrat Adell, Jordi; Agell Jané, Núria; Sánchez Soler, Monica; Ruiz Vegas, Francisco Javier (2020-02-27)
    Article
    Restricted access - publisher's policy
    People have come to refer to reviews for valuable information on products before making a purchase. Digesting relevant opinions regarding a product by reading all the reviews is challenging. An automated methodology which ...
  • Effectiveness of blended instructional design based on active learning in a graphic engineering course 

    Olmedo Torre, Noelia; Martínez Martínez, María; Peña Carrera, Marta (2020-09-22)
    Article
    Restricted access - publisher's policy
    Encouraging the use of active-learning methodologies, both inside and outside the classroom by means of planned activities, is a key factor in effective learning, as well as being essential for students to achieve the goals ...
  • Transición de la docencia presencial a la no presencial en la UPC durante la pandemia del COVID-19 

    García Planas, María Isabel; Taberna Torres, Judit (2021)
    Article
    Open Access
    Ante el inesperado estado de alarma decretado con motivo de la pandemia producida por el Covid-19, las universidades españolas se han visto obligadas a adaptar la docencia a esta situación, utilizando como medio principal ...
  • Critical velocity in kink-defect interaction models: rigorous results 

    Martínez-Seara Alonso, M. Teresa; Guàrdia Munarriz, Marcel; Gomide, Otávio M.L. (2020-01-01)
    Article
    Open Access
    In this work we study a model of interaction of kinks of the sine-Gordon equation with a weak defect. We obtain rigorous results concerning the so-called critical velocity derived in [7] by a geometric approach. More ...

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