When do two planted graphs have the same cotransversal matroid?

Cotransversal matroids are a family of matroids that arise from planted graphs. We prove that two planted graphs give the same cotransversal matroid if and only if they can be obtained from each other by a series of local moves.Comment: 12 pages, 7 figures; expository change

Entities as topic labels: Improving topic interpretability and evaluability combining Entity Linking and Labeled LDA

In order to create a corpus exploration method providing topics that are easier to interpret than standard LDA topic models, here we propose combining two techniques called Entity linking and Labeled LDA. Our method identifies in an ontology a series of descriptive labels for each document in a corpus. Then it generates a specific topic for each label. Having a direct relation between topics and labels makes interpretation easier; using an ontology as background knowledge limits label ambiguity. As our topics are described with a limited number of clear-cut labels, they promote interpretability, and this may help quantitative evaluation. We illustrate the potential of the approach by applying it in order to define the most relevant topics addressed by each party in the European Parliament's fifth mandate (1999-2004).Comment: in Proceedings of Digital Humanities 2016, Krako

A revision of the neotropical genus Anahi Martínez (Coleoptera: Scarabaeidae: Melolonthinae) with the description of two new species

El género Anahi Martínez del sur del Neotrópico es comprensivamente revisado y ahora contiene tres especies: A. dentata Ocampo & Ruiz- Manzanos especie nueva, A. guaraniticus Martínez y A. oblivia Ocampo & Ruiz-Manzanos especie nueva. Las nuevas especies extienden la distribución del género de Paraguay y Bolivia a Argentina. A. guaraniticus es redescripta y se amplían los caracteres que definen el género para incluir A. dentata y A. oblivia. Se proveen descripciones, ilustraciones diagnósticas, mapas de distribución y una clave para todas las especies del género. La biogeografía del género y su posición sistemática entre los Melolonthinae son tratados en este artículo. El género Anahi Martínez del sur del Neotrópico es comprensivamente revisado y ahora contiene tres especies: A. dentata Ocampo & Ruiz- Manzanos especie nueva, A. guaraniticus Martínez y A. oblivia Ocampo & Ruiz-Manzanos especie nueva. Las nuevas especies extienden la distribución del género de Paraguay y Bolivia a Argentina. A. guaraniticus es redescripta y se amplían los caracteres que definen el género para incluir A. dentata y A. oblivia. Se proveen descripciones, ilustraciones diagnósticas, mapas de distribución y una clave para todas las especies del género. La biogeografía del género y su posición sistemática entre los Melolonthinae son tratados en este artículo. The southern Neotropical genus Anahi Martínez is comprehensively revised and now includes three species: A. dentata Ocampo & Ruiz-Manzanos new species, A. guaraniticus Martínez, and A. oblivia Ocampo & Ruiz-Manzanos new species. The new species extend the distribution of the genus from Paraguay and Bolivia to Argentina. A. guaraniticus is redescribed and the characters that define the genus are extended to include A. dentata and A. oblivia. Descriptions, diagnosis illustrations, distribution maps and a key to all species of the genus are provided. The biogeography of the genus and its systematic placement within Melolonthinae are here discussed. The southern Neotropical genus Anahi Martínez is comprehensively revised and now includes three species: A. dentata Ocampo & Ruiz-Manzanos new species, A. guaraniticus Martínez, and A. oblivia Ocampo & Ruiz-Manzanos new species. The new species extend the distribution of the genus from Paraguay and Bolivia to Argentina. A. guaraniticus is redescribed and the characters that define the genus are extended to include A. dentata and A. oblivia. Descriptions, diagnosis illustrations, distribution maps and a key to all species of the genus are provided. The biogeography of the genus and its systematic placement within Melolonthinae are here discussed.The southern Neotropical genus Anahi Martínez is comprehensively revised and now includes three species: A. dentata Ocampo & Ruiz-Manzanos new species, A. guaraniticus Martínez, and A. oblivia Ocampo & Ruiz-Manzanos new species. The new species extend the distribution of the genus from Paraguay and Bolivia to Argentina. A. guaraniticus is redescribed and the characters that define the genus are extended to included, dentata and A. oblivia. Descriptions, diagnosis illustrations, distribution maps and a key to all species of the genus are provided. The biogeography of the genus and its systematic placement within Melolonthinae are here discussed.Fil: Ocampo, Federico Carlos. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. University of Nebraska State Museum; Estados UnidosFil: Ruiz Manzanos, Eider. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Investigaciones de las Zonas Áridas. Provincia de Mendoza. Instituto Argentino de Investigaciones de las Zonas Áridas. Universidad Nacional de Cuyo. Instituto Argentino de Investigaciones de las Zonas Áridas; Argentin

Generalized off-equilibrium fluctuation-dissipation relations in random Ising systems

We show that the numerical method based on the off-equilibrium fluctuation-dissipation relation does work and is very useful and powerful in the study of disordered systems which show a very slow dynamics. We have verified that it gives the right information in the known cases (diluted ferromagnets and random field Ising model far from the critical point) and we used it to obtain more convincing results on the frozen phase of finite-dimensional spin glasses. Moreover we used it to study the Griffiths phase of the diluted and the random field Ising models.Comment: 20 pages, 10 figures, uses epsfig.sty. Partially presented at StatPhys XX in a talk by one of the authors (FRT). Added 1 reference in the new versio

Deep adaptative spectral zoom for improved remote heart rate estimation

Recent advances in remote heart rate measurement, motivated by data-driven approaches, have notably enhanced accuracy. However, these improvements primarily focus on recovering the rPPG signal, overlooking the implicit challenges of estimating the heart rate (HR) from the derived signal. While many methods employ the Fast Fourier Transform (FFT) for HR estimation, the performance of the FFT is inherently affected by a limited frequency resolution. In contrast, the Chirp-Z Transform (CZT), a generalization form of FFT, can refine the spectrum to the narrow-band range of interest for heart rate, providing improved frequential resolution and, consequently, more accurate estimation. This paper presents the advantages of employing the CZT for remote HR estimation and introduces a novel data-driven adaptive CZT estimator. The objective of our proposed model is to tailor the CZT to match the characteristics of each specific dataset sensor, facilitating a more optimal and accurate estimation of HR from the rPPG signal without compromising generalization across diverse datasets. This is achieved through a Sparse Matrix Optimization (SMO). We validate the effectiveness of our model through exhaustive evaluations on three publicly available datasets UCLA-rPPG, PURE, and UBFC-rPPG employing both intra- and cross-database performance metrics. The results reveal outstanding heart rate estimation capabilities, establishing the proposed approach as a robust and versatile estimator for any rPPG method

Politiouretanos termoestables vitriméricos con propiedades mejoradas de reciclabilidad

En aquesta tesi s'ha avançat en l'estudi de xarxes termoestables de politiouretan (PTU) reciclables, gràcies al bescanvi dinàmic entre grups tiouretà. Els materials s'han preparat per reacció entre tiols i isocianats polifuncionals, tant en condicions àcides com bàsiques. A més, s'han estudiat les aplicacions d'aquests materials com a materials reciclables, autoreparables i com a matrius de materials compostos. Buscant una major sostenibilitat, s'ha estudiat l'activitat catalítica d'alternatives als compostos d'estany (IV), els més utilitzats a escala industrial. També s'han preparat tiols a partir de derivats de la biomassa, i s'ha estudiat el seu paper com substitut de tiols derivats de combustibles fòssils.En esta tesis se ha avanzado en el estudio de redes termoestables de politiouretano (PTU) reciclables, debido al intercambio dinámico entre grupos tiouretano. Los materiales se han preparado por reacción entre tioles e isocianatos polifuncionales, tanto en condiciones ácidas como básicas. Además, se han estudiado las aplicaciones de estos materiales como materiales reciclables y autorreparables, y como matrices de composites. En búsqueda de una mayor sostenibilidad, se ha estudiado la actividad catalítica de alternativas a los compuestos de estaño (IV), los más empleados a nivel industrial. También se han preparado tioles a partir de derivados de la biomasa, y se ha estudiado su papel como sustituto de tioles derivados de combustibles fósiles.In this thesis, progress has been made in the study of recyclable polythiourethane (PTU) thermosetting networks, due to the dynamic exchange between thiourethane groups. The materials have been prepared by reaction between polyfunctional thiols and isocyanates, both under acidic and basic conditions. In addition, the applications of these materials as recyclable and self-healing materials and as matrix composite have been studied. In search of a greater sustainability, the catalytic activity of alternatives to tin (IV) compounds, the most widely used at an industrial level, has been studied. Different thiols have also been prepared from biomass derivatives, and their role as a substitute for thiols derived from fossil fuels has been studied