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Bielliptic modular curves X-0*(N)
(2020-10-01)
Article
Open AccessLet 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
(2020)
Article
Restricted access - publisher's policyWe 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
(Multidisciplinary Digital Publishing Institute, 2020-10-16)
Article
Open AccessA 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
(Springer, 2020-08-07)
Article
Open AccessWe 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
(2020-03-05)
Article
Restricted access - publisher's policyAbstract 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
(Societat Catalana de Matemàtiques (SCM), 2020-02)
Article
Open AccessEn 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
(2020-09)
Article
Open AccessThe 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
(Multidisciplinary Digital Publishing Institute (MDPI), 2020-04-01)
Article
Open AccessIn 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
(2020-02-27)
Article
Restricted access - publisher's policyPeople 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
(2020-09-22)
Article
Restricted access - publisher's policyEncouraging 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
(2021)
Article
Open AccessAnte 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
(2020-01-01)
Article
Open AccessIn 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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