Almost sure testability of classes of densities

Let a class $\F$ of densities be given. We draw an i.i.d.\ sample from a density $f$ which may or may not be in $\F$. After every $n$, one must make a guess whether $f \in \F$ or not. A class is almost surely testable if there exists such a testing sequence such that for any $f$, we make finitely many errors almost surely. In this paper, several results are given that allowone to decide whether a class is almost surely testable. For example, continuity and square integrability are not testable, but unimodality, log-concavity, and boundedness by a given constant are.

Inequalities for a new data-based method for selecting nonparametric density estimates

We continue the development of a method for the selection of a bandwidth or a number of design parameters in density estimation. We provideexplicit non-asymptotic density-free inequalities that relate the $L_1$ error of the selected estimate with that of the best possible estimate,and study in particular the connection between the richness of the classof density estimates and the performance bound. For example, our methodallows one to pick the bandwidth and kernel order in the kernel estimatesimultaneously and still assure that for {\it all densities}, the $L_1$error of the corresponding kernel estimate is not larger than aboutthree times the error of the estimate with the optimal smoothing factor and kernel plus a constant times $\sqrt{\log n/n}$, where $n$ is the sample size, and the constant only depends on the complexity of the family of kernels used in the estimate. Further applications include multivariate kernel estimates, transformed kernel estimates, and variablekernel estimates.

The three strands of intercultural polities: a comprehensive view. A critical review of Bouchard and Cantle recent books on interculturalism

Within the emerging policy debate on interculturalism we critically review two recent books in 2012: Bouchard’s L’interculturalisme: un point de vue quebecois, and Cantle’s Interculturalism: The New Era of Cohesion and Diversity. In my view, both contribute very directly to open a foundational debate on interculturalism. In addressing the point of convergence and the dividing lines of these two contributions, I will claim that in spite of having one core concept of interculturalism, there are, however, at least two basic conceptions that have to be interpreted in complementary ways: Bouchard’s essay represents the contractual strand, Cantle’s book the cohesion strand. At the end I would also suggest that these two strands do not manage to express explicitly that diversity can also be seen as a resource of innovation and creativity, and so can drive individual and social development. This view is based on the diversity advantage literature already informing most of the diversity debate in Europe and elsewhere. This is what I will call the constructivist strand. My ultimate purpose is to defend a comprehensive view, grounded on the argument that no one can have the sole authority to define intercultural policy, since the three strands can be applied at different moments, according to different purposes and policy needs. The challenge now is that policy managers be able to achieve a balance between these three policy drivers.

Pathogenic plant-microbe interactions. What we know and how we benefit

Plants, like humans and other animals, also get sick, exhibit disease symptoms, and die. Plant diseases are caused by environmental stress, genetic or physiological disorders and infectious agents including viroids, viruses, bacteria and fungi. Plant pathology originated from the convergence of microbiology, botany and agronomy; its ultimate goal is the control of plant disease. Microbiologists have been attracted to this field of research because of the need for identification of the agents causing infectious diseases in economically important crops. In 1878—only two years after Pasteur and Koch had shown for the first time that anthrax in animals was caused by a bacteria—Burril, in the USA, discovered that the fire blight disease of apple and pear was also caused by a bacterium (nowadays known as Erwinia amylovora). In 1898, Beijerinck concluded that tobacco mosaic was caused by a “contagium vivum fluidum” which he called a virus. In 1971, Diener proved that a potato disease named potato spindle tuber was caused by infectious RNA which he called viroid

La premsa comarcal i el consum de noves pantalles

La investigació es centra en la visió dels mitjans de proximitat i el consum de d’aquests mitjans en el marc de la convergència digital a Catalunya. No és cap misteri l’aparició de nous hàbits de consum de continguts dels mitjans de comunicació nous i vells, on uns prefereixen, la premsa, la televisió i la ràdio, i d’altres amplien l’experiència i/o prefereixen la consulta de portals web, xarxes socials o continguts per internet a través de, dispositius mòbils, consoles de vídeojocs, etc. La recerca esta està dividida en dos grans blocs: per una banda, un estudi qualitatiu amb entrevistes en profunditat als responsables de mitjans comarcals sobre la seva visió com mitjà, i la seva trajectòria, i sobre els propis lectors, radiooients, i seguidors, ; i per l’altra banda, un quantitatiu mitjançant a partir d’una enquesta online a residents a Catalunya sobre el consum de mitjans. Les conclusions mostren una radiografia de l’actual ecosistema mediàtic a Catalunya.

Consumo y convergencia mediática de la prensa local en Cataluña

Los nuevos hábitos de consumo de medios en el marco de la convergencia digital están propiciando un cambio en las estrategias de los medios de comunicación. Mientras unos usuarios siguen prefiriendo la radio, la televisión y la prensa tradicional para informarse otros participan de la experiencia digital en internet (blogs, redes sociales...) y dispositivos móviles, etc. En este panorama es complicado precisar dónde nace y termina el contenido o hasta qué punto es la participación del usuario quien (re) construye la información; así los contenidos mutan y se diluyen en varios soportes. En este contexto, la prensa local también vive las consecuencias del nuevo paradigma y asume los retos del reacomodo del sector ante la nueva realidad. Esta comunicación presenta las conclusiones del estudio cualitativo con entrevistas en profundidad a los responsables de medios locales en Cataluña sobre sus usuarios, contenidos y soportes en el marco de la convergencia digital.

La Salut als diaris digitals, una qüestió de salut digital: les notícies de salut en els diaris digitals en llengua catalana: exploració i assaig metodològic per a l'anàlisi descriptiva

En l’actual context de la societat de la informació, les noves tecnologies de la comunicació i, específicament, el fenomen d’Internet, adquireixen una importància rellevant en tots els sectors socials i fan replantejar la comunicació de masses. Les característiques que ofereixen els mitjans digitals (multimedialitat, hipertextualitat, interactivitat) comporten una nova forma d’estructurar i llegir la informació. Així, capçaleres i periodistes s’han d’actualitzar en la producció de la informació i en la seva transmissió, i l’usuari ha d’aprendre noves formes de lectura per adaptar-se al nou paradigma comunicacional. D’altra banda, la societat del benestar en què vivim reclama cada cop més als mitjans de comunicació generals i també específicament als digitals que parlin de temes de salut. Aquests mitjans esdevenen fonts principals d’aquest tipus d’informació, després del metge, per a la gestió autònoma de la pròpia salut. És a partir d’aquesta convergència de mitjans digitals, periodisme i salut, de la necessitat d’explorar la situació actual i del desig d’aportar coneixements per a la millora de la pràctica professional del periodisme, que es desenvolupa el treball que es presenta en aquesta memòria. El projecte que es presenta és una anàlisi restrospectiva i descriptiva de les notícies de salut que es produeixen durant un mes als diaris digitals que publiquen en llengua catalana: El Periódico de Catalunya, l’Avui, i LaMalla.net.

Radar analysis of the life cycle of mesoscale convective systems during the 10 June 2000 event

The 10 June 2000 event was the largest flash flood event that occurred in the Northeast of Spain in the late 20th century, both as regards its meteorological features and its considerable social impact. This paper focuses on analysis of the structures that produced the heavy rainfalls, especially from the point of view of meteorological radar. Due to the fact that this case is a good example of a Mediterranean flash flood event, a final objective of this paper is to undertake a description of the evolution of the rainfall structure that would be sufficiently clear to be understood at an interdisciplinary forum. Then, it could be useful not only to improve conceptual meteorological models, but also for application in downscaling models. The main precipitation structure was a Mesoscale Convective System (MCS) that crossed the region and that developed as a consequence of the merging of two previous squall lines. The paper analyses the main meteorological features that led to the development and triggering of the heavy rainfalls, with special emphasis on the features of this MCS, its life cycle and its dynamic features. To this end, 2-D and 3-D algorithms were applied to the imagery recorded over the complete life cycle of the structures, which lasted approximately 18 h. Mesoscale and synoptic information were also considered. Results show that it was an NS-MCS, quasi-stationary during its stage of maturity as a consequence of the formation of a convective train, the different displacement directions of the 2-D structures and the 3-D structures, including the propagation of new cells, and the slow movement of the convergence line associated with the Mediterranean mesoscale low.

An observational study of the 7 September 2005 Barcelona tornado outbreak

This paper presents an observational study of the tornado outbreak that took place on the 7 September 2005 in the Llobregat delta river, affecting a densely populated and urbanised area and the Barcelona International airport (NE Spain). The site survey confirmed at least five short-lived tornadoes. Four of them were weak (F0, F1) and the other one was significant (F2 on the Fujita scale). They started mostly as waterspouts and moved later inland causing extensive damage estimated in 9 million Euros, three injured people but fortunately no fatalities. Large scale forcing was provided by upper level diffluence and low level warm air advection. Satellite and weather radar images revealed the development of the cells that spawned the waterspouts along a mesoscale convergence line in a highly sheared and relatively low buoyant environment. Further analysis indicated characteristics that could be attributed indistinctively to non-supercell or to mini-supercell thunderstorms.

Las relaciones comerciales de la Unión Europea con sus vecinos: ¿europeización, internacionalización o coordinación?

[spa] La política de Vecindad de la Unión Europea se acostumbra a interpretar como un instrumento de europeización forzada. Gracias a su fuerza de negociación, la Unión Europea impondría a sus vecinos su modelo económico y hasta político y social. Esta sin embargo no es la evidencia que se obtiene en el ámbito del comercio. En consonancia con el modelo teórico de relaciones exteriores desarrollado por varios investigadores bajo la dirección de Esther Barbé, observamos como, en el ámbito comercial, el modelo de relaciones entre la Unión Europea y cuatro países de la política de Vecindad puede ser tanto de europeización como también de internacionalización o de coordinación. El tipo de modelo aplicado viene condicionado, como asevera el marco teórico, por el cumplimiento de las condiciones necesarias que se requieren para que Europa imponga sus normas: legitimidad, incentivos y coherencia interna. Estas condiciones varían en función tanto del tema tratado como del país vecino.

Growth and externalities across economies : an empirical analysis using spatial econometrics

Recent theoretical models of economic growth have emphasised the role of external effects on the accumulation of factors of production. Although most of the literature has considered the externalities across firms within a region, in this paper we go a step further and consider the possibility that these externalities cross the barriers of regional economies. We assess the role of these external effects in explaining growth and economic convergence. We present a simple growth model, which includes externalities across economies, developing a methodology for testing their existence and estimating their strength. In our view, spatial econometrics is naturally suited to an empirical consideration of these externalities. We obtain evidence on the presence of significant externalities both across Spanish and European regions.

New Estimates of Regional GDP in Spain, 1860-1930

This paper presents a new regional database on GDP in Spain for the years 1860, 1900, 1914 and 1930. Following Geary and Stark (2002), country level GDP estimates are allocated across Spanish provinces. The results are then compared with previous estimates. Further, this new evidence is used to analyze the evolution of regional inequality and convergence in the long run. According to the distribution dynamics approach suggested by Quah (1993, 1996) persistence appears as a main feature in the regional distribution of output. Therefore, in the long run no evidence of regional convergence in the Spanish economy is found.

Las relaciones comerciales de la Unión Europea con sus vecinos: ¿europeización, internacionalización o coordinación?

[spa] La política de Vecindad de la Unión Europea se acostumbra a interpretar como un instrumento de europeización forzada. Gracias a su fuerza de negociación, la Unión Europea impondría a sus vecinos su modelo económico y hasta político y social. Esta sin embargo no es la evidencia que se obtiene en el ámbito del comercio. En consonancia con el modelo teórico de relaciones exteriores desarrollado por varios investigadores bajo la dirección de Esther Barbé, observamos como, en el ámbito comercial, el modelo de relaciones entre la Unión Europea y cuatro países de la política de Vecindad puede ser tanto de europeización como también de internacionalización o de coordinación. El tipo de modelo aplicado viene condicionado, como asevera el marco teórico, por el cumplimiento de las condiciones necesarias que se requieren para que Europa imponga sus normas: legitimidad, incentivos y coherencia interna. Estas condiciones varían en función tanto del tema tratado como del país vecino.

Growth and externalities across economies : an empirical analysis using spatial econometrics

Recent theoretical models of economic growth have emphasised the role of external effects on the accumulation of factors of production. Although most of the literature has considered the externalities across firms within a region, in this paper we go a step further and consider the possibility that these externalities cross the barriers of regional economies. We assess the role of these external effects in explaining growth and economic convergence. We present a simple growth model, which includes externalities across economies, developing a methodology for testing their existence and estimating their strength. In our view, spatial econometrics is naturally suited to an empirical consideration of these externalities. We obtain evidence on the presence of significant externalities both across Spanish and European regions.

Sum rules and correlations in asymmetric nuclear matter

The neutron and proton single-particle spectral functions in asymmetric nuclear matter fulfill energy-weighted sum rules. The validity of these sum rules within the self-consistent Green's function approach is investigated. The various contributions to these sum rules and their convergence as a function of energy provide information about correlations induced by the realistic interaction between the nucleons. The study of the sum rules in asymmetric nuclear matter exhibits the isospin dependence of the nucleon-nucleon correlations.