El santuario burebano de Santa Casilda. En torno a su Iglesia y hospedería en el siglo XVIII

Desde la consideración de las relaciones entre arte y devociones populares, se abordan las transformaciones experimentadas por el santuario burebano de Santa Casi Ida que culminan, en el siglo XVIII, bajo la óptica barroca. El análisis de las mismas se ofrece a través de nuevos aportes documentales que evidencian el íntimo diálogo establecido entre arquitectura y paisaje. Y éste, a su vez, adquiere una marcada individualidad mediante la integración de muy diversas expresiones artísticas.From the consideration of the relatíonship art and popular devotions, in this article we analyse the changes experienced by the sanctuary of St. Casilda in La Bureba (Burgos) during the 18th Century with a clear orientation to the Baroque. For this purpose, we present new documentary evidences that support the existence of an open dialogue between architecture and landscape. This open dialogue creates an artistic ensemble with marked individuality through the integration of very different artistic expressions

Spectral Properties and Quantum Phase Transitions in Superconducting Junctions with a Ferromagnetic Link

We study theoretically the spectral and transport properties of a superconducting wire with a magnetic defect. We start by modelling the system as a one dimensional magnetic Josephson junction and derive the equation determining the full subgap spectrum in terms of the normal-state transfer matrix for arbitrary length and exchange field of the magnetic region. We demonstrate that the quantum phase transition predicted for a short-range magnetic impurity, and associated with a change of the total spin of the system, also occurs in junctions of finite length. Specifically, we find that the total spin changes discontinuously by integer jumps when bounds states cross the Fermi level. The spin can be calculated by using a generalization of Friedel sum rule for the superconducting state, which we also derive. With these tools, we analyze the subgap spectrum of a junction with the length of the magnetic region smaller than the superconducting coherence length and demonstrate how phase transitions also manifest as change of the sign of the supercurrent.Comment: 7 pages, 3 figure

Current labour migration: business expatriation or brain drain?

[Resumo] Este traballo analiza o proceso de internacionalización empresarial e os seus efectos sobre a organización e xestión dos recursos humanos, en particular no tocante á migración de tipo laboral, cuxo obxectivo básico é a busca de emprego. Así, desde unha perspectiva individual, analízanse tamén as tendencias da emigración dos mozos españois durante a etapa de crise actual, especialmente entre o grupo con maior nivel de formación, o que se dá en coñecer como «fuga de cerebros». Trátase dun fenómeno recente que, aínda que acadou gran notoriedade social, non foi suficientemente explorado para o caso español. De por parte, preséntanse como caso de estudo nove proxectos migratorios de mozos emigrantes galegos no exterior, que inclúen tanto as súas estratexias de integración sociolaboral como percepcións, opinións e apreciacións persoais sobre a súa situación actual. A metodoloxía de traballo segue unha liña estruturada que inclúe técnicas de investigación cuantitativa e cualitativa que se basean, por un lado, na explotación de fontes secundarias oficiais; e, polo outro, na realización de enquisas en profundidade semiestruturadas. Os resultados revelan a incuestionable tendencia á alza da emigración xuvenil española durante a actual etapa de crise para todos os destinos considerados. Porén, o efecto de «retorno ás raíces» parece ser aínda máis poderoso, sobre todo se mellora a situación do mercado laboral español. Con todo, dado que é un fenómeno recente, que non mostra desgaste nin moderación, haberá que agardar para coñecer a súa tendencia no futuro.[Abstract] This paper analyses the process of corporate globalization and its effects on the organization and management of human resources. This phenomenon has very clear effects on labour migration rate, internationally, whose main objective is the search for employment. Thus, from an individual perspective, trends in migration of Spanish youth during the current stage of crisis are also analysed, especially in the group with the highest level of training, which has become known as “brain drain”. This is a recent phenomenon, although with great presence in society, has not been explored enough for the Spanish case. In addition, it is presented a case study of nine migrant youth projects of Galician emigrants abroad that include both social and labour integration strategies and their perceptions, opinions and assessments about their current situation. The work methodology follows a structured line that includes two research techniques (quantitative and qualitative) based on the use of official secondary sources first and, secondly, on semi-structured in-depth surveys. The results reveal the undeniable upward trend in the Spanish university youth migration during the current stage of crisis to all foreign destinations covered, due to the lack of jobs and the need of finding new and better opportunities. However, the “return to roots effect” seems to have an even more powerful effect, especially if the situation of the Spanish labour market improves. Since this is a recent phenomenon, we should wait to see future trend

The effects of mixing on the evolution of intermediate-mass stars of different metallicities

We study the evolution of solar (Z = 0.016) and metal-poor stars (Z = 0.001) of initial masses corresponding to 2M⊙, and 4M⊙, from the main sequence until the formation of degenerate carbon-oxygen cores. We explore the nucleosynthesis during the core hydrogen burning phase through the CNO cycle and during the core helium burning phase through the 3α reaction. We determine the combined effects of the nucleosynthesis and of the convective mixing episodes on the surface composition of the considered stars. This work is intended to be a starting point to analyze the effects of more sophisticated treatments of mixing by convection, making special emphasis in the case of metal-poor stars

Influence of blue stain on density and dimensional stability of Pinus radiata timber from northern Galicia (Spain)

Holzforschung. International Journal of the Biology, Chemistry, Physics, and Technology of Wood; 69(1): 97–102 DOI: 10.1515/hf-2014-0014The presence of blue-stain fungi considerably decreases the value of Pinus radiata timber, which is commercially important in Galicia (NW Spain). For this study, seven young pine trees growing in four different plantations were felled, and 20 discs were sampled from different heights in the stems. Parts of the discs were discoloured as a result of fungal infection. The discs were cut into small specimens. Defect-free specimens (controls) were selected for determining density and dimensional stability both in the volume and in the axial direction. Physical properties of fully blue-stained specimens and the controls were compared for each disc based on one-factor analysis of variance. As the factor was blue-stain, the other sources of variation were suppressed, such as tree source, height in the stem, ring width, cambial age and presence of heartwood or sapwood. Most of the physical properties analysed on some sample discs differed significantly between discoloured and unstained wood. The variables most affected by blue stain were basic density and volumetric shrinkage: blue-stained wood was 1.1% lighter and volumetric shrinkage was 5% higher in blue-stained wood than in the controls

Dramatic spectral transition of X-ray pulsar GX 304-1 in low luminous state

We report on the discovery of a dramatic change in the energy spectrum of the X-ray pulsar GX 304-1 appearing at low luminosity. Particularly, we found that the cutoff power-law spectrum typical for accreting pulsars, including GX 304-1 at higher luminosities of $L_{\rm X}\sim 10^{36} - 10^{37}$ erg s$^{-1}$, transformed at lower luminosity of $L_{\rm X}\sim 10^{34}$ erg s$^{-1}$ to a two-component spectrum peaking around 5 and 40 keV. We suggest that the observed transition corresponds to a change of the dominant mechanism responsible for the deceleration of the accretion flow. We argue that the accretion flow energy at low accretion rates is released in the atmosphere of the neutron star, and the low-energy component in the source spectrum corresponds to the thermal emission of the optically thick, heated atmospheric layers. The most plausible explanations for the high-energy component are either the cyclotron emission reprocessed by the magnetic Compton scattering or the thermal radiation of deep atmospheric layers partly Comptonized in the overheated upper layers. Alternative scenarios are also discussed.Comment: 5 pages, 2 figures, accepted by MNRAS Letter