X-ray/gamma-ray flux correlations in the BL Lacs Mrk 421 and 501 using HAWC data

The HAWC gamma ray observatory is located at the Sierra Negra Volcano in Puebla, Mexico, at an altitude of 4,100 meters. HAWC is a wide field of view array of 300 water Cherenkov detectors that are continuously surveying ~ 2sr of the sky, operating since March 2015. The large collected data sample allows HAWC to perform an unbiased monitoring of the BL Lac Mrk 421. This is the closest and brightest known extragalactic high-synchrotron-peaked BL Lac in the gamma-ray/X- ray bands and is extensively monitored by the Large Area Telescope (LAT) on-board the Fermi satellite, and the BAT and XRT instruments of the Swift satellite. In this work, we use 25 months of HAWC data together with Swift-XRT data to characterize potential correlations between both wavelengths. This analysis shows that HAWC and Swift-XRT data are correlated even stronger than expected for quasi-simultaneous observations.Comment: Presented at the 35th International Cosmic Ray Conference (ICRC2017), Bexco, Busan, Korea. See arXiv:1708.02572 for all HAWC contribution

Static locality analysis for cache management

Most memory references in numerical codes correspond to array references whose indices are affine functions of surrounding loop indices. These array references follow a regular predictable memory pattern that can be analysed at compile time. This analysis can provide valuable information like the locality exhibited by the program, which can be used to implement more intelligent caching strategy. In this paper we propose a static locality analysis oriented to the management of data caches. We show that previous proposals on locality analysis are not appropriate when the proposals have a high conflict miss ratio. This paper examines those proposals by introducing a compile-time interference analysis that significantly improve the performance of them. We first show how this analysis can be used to characterize the dynamic locality properties of numerical codes. This evaluation show for instance that a large percentage of references exhibit any type of locality. This motivates the use of a dual data cache, which has a module specialized to exploit temporal locality, and a selective cache respectively. Then, the performance provided by these two cache organizations is evaluated. In both organizations, the static locality analysis is responsible for tagging each memory instruction accordingly to the particular type(s) of locality that it exhibits.Peer ReviewedPostprint (published version

Influence of temperature and time on the Eu3+ reaction with synthetic Na-Mica-n (n = 2 and 4)

Bentonite is accepted as the best clay material for the engineered barrier of Deep Geological Repositories (DGRs). The performance of clay as the main component of the engineered barrier in the DGR has been intensively studied and the structure of the selected clay mineral play a crucial role. In this sense, a new family of synthetic swelling silicates, Na-Mica-n, with tuned layer charge (n) values between 2.0 and 4.0 per unit cell has recently been synthesized and a general synthetic method has been reported. These swelling high-charge micas could be highly valuable for the decontamination of harmful cations. The ability of these micas to immobilize Eu3+ under subcritical conditions has been probed. The adsorption was in both non-specific sites (cation exchange mechanism) and specific sites (chemical reaction or surface defects adsorption). Moreover, its adsorption capacity, under the same conditions is higher than in saponite and far superior to the bentonites.Junta de Andalucía P12-FQM-567European Union 29178

Spatial dimension changes in second hand housing prices in Alcalá de Henares and León (Spain)

The objective of this study is to show different recent trends (2001-2009) in second-hand housing prices in Spain and in different neighbourhoods in Alcala de Henares and León, both of which are cities with very diverse economic and demographic characteristics. The first is a city in the metropolitan area of Madrid, with high land prices. The increasing demand for housing in Alcala de Henares is a good alternative for households, in view of high prices in Madrid. The second is Léon, the capital of the province of León, which is undergoing a depopulation process. We will demonstrate that house price dynamics is a local phenomenon and national or regional level data conceal interesting differences within cities (districts and neighbourhoods). The latest rise and decline in housing prices is clearly visible on the outskirts and sometimes non-existent in the town centre area

Pyroclasts of the first phases of the explosive-effusive PCCVC volcanic eruption: physicochemical analysis

The morphology, texture, grain size and other physicochemical characteristics of pyroclastic material from the first phases of the Puyehue-Cordon Caulle volcanic complex (PCCVC) eruption, (Southern Andes, Chile), can be associated to the model recently reported for the magma storage and its ascent conditions. The eruption started June 4th 2011, and the studied volcanic material corresponds to that collected in Argentine territory at different distances from the source, between 4 and 12 June 2011. The explosive-effusive volcanic process of the first days occurred with the simultaneous emplacement of lava flows and the venting of pyroclastic material, ejecting two well differentiated types of particles. The more abundant was constituted by rhyolitic and light color pumice fragments, characterized by a typical vesicular texture, easy fragmentation and absence of occluded crystalline phases. Particles found in minor proportion were dark color, different in shape and texture and rich in Fe and Ti. They seemed to be more effective for the interaction with emitted gases in the upper part of the column, for this reason, they appeared partially covered by condensation products. The ascent conditions of the magma affected its rheological behavior through variations in the degassing, viscosity and fragmentation. On the other hand, distance to the source, depositional time, volcanic evolution and environmental conditions are factors that affect the chemical composition of collected ash. So, the SiO2/FeO ratio not only increases with the distance but also with the deposition time and volcanic activity. The work was done with the aid of several techniques such as a laser-sediment analyzer, X-ray diffraction (XRD), chemical analysis (bulk and surface), SEM microscopy and Raman “microprobe” spectroscopy. On the other hand, the physicochemical behavior of the pyroclastic material allows us to suggest eventual applications

Hardy spaces and quasiregular mappings

We study Hardy spaces $\mathcal{H}^p$, $0<p<\infty$ for quasiregular mappings on the unit ball $B$ in $\mathbb{R}^n$ which satisfy appropriate growth and multiplicity conditions. Under these conditions we recover several classical results for analytic functions and quasiconformal mappings in $\mathcal{H}^p$. In particular, we characterize $\mathcal{H}^p$ in terms of non-tangential limit functions and non-tangential maximal functions of quasiregular mappings. Among applications we show that every quasiregular map in our class belongs to $\mathcal{H}^p$ for some $p=p(n,K)$. Moreover, we provide characterization of Carleson measures on $B$ via integral inequalities for quasiregular mappings on $B$. We also discuss the Bergman spaces of quasiregular mappings and their relations to $\mathcal{H}^p$ spaces and analyze correspondence between results for $\mathcal{H}^p$ spaces and $\mathcal{A}$-harmonic functions. A key difference between the previously known results for quasiconformal mappings in $\mathbb{R}^n$ and our setting is the role of multiplicity conditions and the growth of mappings that need not be injective. Our paper extends results by Astala and Koskela, Jerison and Weitsman, Jones, Nolder, and Zinsmeister.Comment: 21 page

Juan Ramón Jiménez y su entorno social y cultural: de la correspondencia con León Sánchez Cuesta (1927-1956)

Este artículo profundiza en el entorno social y cultural de Juan Ramón Jiménez a través de su relación con León Sánchez Cuesta, conocido como el “librero de la generación del 27”. Para ello revisamos diversas fuentes bibliográfi cas, especialmente la correspondencia inédita que el librero dirigió al poeta y de la cual se reproducen en el artículo dos cartas. Sánchez Cuesta fue amigo personal, depositario exclusivo de la obra de Juan Ramón Jiménez entre 1925 y 1933, aproximadamente, difusor y distribuidor de su obra y uno de sus principales suministradores de libros. El librero también jugó un papel importante como mediador en las disputas entre Juan Ramón Jiménez y algunos poetas de la “generación del 27”. Sánchez Cuesta es considerado una figura clave en el entorno de Juan Ramón Jiménez y su correspondencia nos permite indagar en el entorno social y cultural y los hábitos de lectura del poeta de Moguer.This article analyzes the social and cultural context of Juan Ramón Jiménez through his relationship with León Sánchez Cuesta, also known as “the librarian of the generation of 27”. For this purpose we review different bibliographic sources, including the unpublished correspondence between Sánchez Cuesta and Juan Ramón Jiménez. Two of these letters are included in this article. Sánchez Cuesta was a friend and sole distributor of the works of Juan Ramón Jiménez during (approximately) the years 1925-1933. He played an important role spreading the work of Juan Ramón and providing him with reading materials. Sánchez Cuesta also played an important mediator role in some disputes between Juan Ramón and some poets of the “generation of ‘27”. Sánchez Cuesta is a key figure in the life of Juan Ramón Jiménez and his correspondence increases our understanding of both the social and cultural context and the reading habits of Juan Ramón Jiménez