When is multitask learning effective? Semantic sequence prediction under varying data conditions

Multitask learning has been applied successfully to a range of tasks, mostly morphosyntactic. However, little is known on when MTL works and whether there are data characteristics that help to determine its success. In this paper we evaluate a range of semantic sequence labeling tasks in a MTL setup. We examine different auxiliary tasks, amongst which a novel setup, and correlate their impact to data-dependent conditions. Our results show that MTL is not always effective, significant improvements are obtained only for 1 out of 5 tasks. When successful, auxiliary tasks with compact and more uniform label distributions are preferable.Comment: In EACL 201

Comparing galaxy populations in compact and loose groups of galaxies II: brightest group galaxies

The properties of the brightest galaxies (BCGs) are studied in both compact and loose groups of galaxies in order to better understand the physical mechanisms influencing galaxy evolution in different environments. Samples of BCGs are selected in the compact groups identified by McConnachie et al. (2009), and in loose groups taken from Zandivarez & Mart\'inez (2011). The following physical properties of the BCGs in compact groups and in subsamples of loose groups are compared, defined by their mass and total luminosity. The fraction of BCGs classified as red and/or early-type as a function of galaxy luminosity are studied. The fraction of the group's total luminosity contained in the BCG and the difference in luminosity between the BCG and the second-ranked galaxy, are also analysed. Some properties of BCGs in compact and loose groups are comparable. However, BCGs in compact groups are systematically more concentrated and have larger surface brightness than their counterparts in both, high- and low-mass loose groups. The fractions of red and early-type BCGs in compact groups are consistent with those of high-mass loose groups. Comparing BCGs in subsamples of compact and loose groups selected for their similar luminosities, BCGs in compact groups are found to be, on average, brighter, more massive, larger, redder and more frequently classified as elliptical. In compact groups, the BCG contains a larger fraction of the system's total luminosity and differs more in absolute magnitude from the second-ranked galaxy. BCGs in compact and loose groups are found to be different. Some mechanisms responsible for transforming late-type galaxies into early types, such as mergers, may be more effective within compact groups due to their high densities and small velocity dispersion, which would lead their BCGs along somewhat different evolutionary paths.Comment: Accepted for publication in Astronomy & Astrophysics (A&A

Soldados hispanos en las cohortes urbanas

En este artículo estudiaremos los testimonios epigráficos de soldados hispanos que sirvieron en las cohortes urbanas.In this article we will study epigraphic remains of hispanic soldiers who served in urban cohorts

Espacio Mestizo . Lenguajes artísticos desde la comunidad con menores en riesgo, en los barrios de León

Treballar vincles i educar des de l’acompanyament de processos vitals és clau, en el treball amb persones amb vincles negatius o amb falta de vincles i referents positius, en la seva vida. Poder aparèixer l’educador com una relació significativa i vinculant, amb el problema afegit i clàssic del compromís personal i la transferència i, fins i tot, ingerència en la vida privada. L’aposta educativa des de la Fundación en aquest sentit és molt clara, cal crear, mantenir i desenvolupar el vincle educatiu amb els nostres adolescents.To work bonds and to educate trhough ongoing support in vital processes are key points in the work with people with negative bonds or with lack of bonds and positive references in their life. The relationship with the educator should be considered significant and binding, but with the added and classic problem of personal commitment and transference, and even the interference in private life. The educational stance of the Foundation in this sense is very clear: educational bonds with our adolscents must be created, sustained and developed.Trabajar vínculos y educar desde el acompañamiento de procesos vitales es clave, en el trabajo con personas con vínculos negativos o con falta de vínculos y referentes positivos, en su vida. Poder aparecer el educador como una relación significativa y vinculante, con el problema añadido y clásico del compromiso personal y la transferencia e, incluso, injerencia en la vida privada. La apuesta educativa desde la Fundación en este sentido es muy clara, hay que crear, mantener y desarrollar el vínculo educativo con nuestros adolescentes

Characterization of optical frequency comb bades me asurements and spectral purity transfer for optical atomic clocks

Tesis doctoral inédita cotutelada por l´Université de La Sorbonne y por la Universidad Autónoma de Madrid, Facultad de Ciencias, Departamento de Física de Materiales. Fecha de lectura: 15-03-202

Ionic liquids in the pretreatment of lignocellulosic biomass

The pretreatment is a key step in the processing of lignocellulosic biomass for its transformation into chemicals and materials of biorenewable origin. Ionic liquids, with their characteristic set of unique properties, have the potential to be the basis of novel pretreatment processes with higher effectiveness and improved sustainability as compared to the current state-of-the-art processes. In this opinion paper, the author provides a perspective on possible processing strategies for this pretreatment with ionic liquids, identifying different advantages as well as challenges to be overcomeThe author is grateful to Xunta de Galicia for support through the Galician Network of Ionic Liquids (reference ED431D 2017/06) and the CRETUS Strategic Partnership (reference ED431E 2018/01), co-funded by the European Regional Development FundS