Triggering magnetar outbursts in 3D force-free simulations

In this letter, we present the first 3D force-free general relativity simulations of the magnetosphere dynamics related to the magnetar outburst/flare phenomenology. Starting from an initial dipole configuration, we adiabatically increase the helicity by twisting the footprints of a spot on the stellar surface and follow the succession of quasi-equilibrium states until a critical twist is reached. Twisting beyond that point triggers instabilities that results in the rapid expansion of magnetic field lines, followed by reconnection, as observed in previous axi-symmetric simulations. If the injection of magnetic helicity goes on, the process is recurrent, periodically releasing a similar amount of energy, of the order of a few % of the total magnetic energy. From our current distribution, we estimate the local temperature assuming that dissipation occurs mainly in the highly resistive outermost layer of the neutron star. We find that the temperature smoothly increases with injected twist, being larger for spots located in the tropical regions than in polar regions, and rather independent of their sizes. After the injection of helicity ceases, the magnetosphere relaxes to a new stable state, in which the persistent currents maintain the footprints area slightly hotter than before the onset of the instability.Comment: 6 pages, 5 figure

Inflation targeting and economic performance: The case of Mexico

In the paper we analyze the impact of Inflation Targeting (IT) in Mexico. The objective is to evaluate the impact of the implementation of inflation targeting and full-fledged inflation targeting (FFIT) on the level and the variability of the inflation and the output in the Mexican economy. We conclude that inflation rates had been reduced in Mexico before the introduction of IT and FFIT. In our opinion, the structural reforms, including the Banxico reforms, are the main determinants of the decrease in inflation and its variability. The main impact of IT would have been the lock-in of inflation expectations around a low rate of inflation

Prediction of overwash in alongshore variable barrier islands [Previsão da ocorrência de galgamentos em ilhas barreira com variabilidade longilitoral]

Overwash prediction is very important for coastal zone management. This work intends to identify alongshore variations in storm impact and evaluate the role of sub-aerial and submerged morphologies in overwash occurrence. For this study, 24 cross-shore topo-bathymetric profiles were set on Barreta Island (Ria Formosa barrier island system, Portugal). Pre- and post-overwash surveys were made between August 2012 and April 2013. During overwash events, tidal levels and wave parameters at breaking were obtained. Overwash occurred under storm and non-storm conditions, the latter coincident with spring high-tide. Beach morphology was spatially variable, and changeable from one overwash episode to the next. Predictions of overwash occurrence were made using the Overwash Potential, defined as the difference between runup and barrier elevation. Several runup equations were tested, and the results compared to the actual observations. The selected predictor provided an accuracy of 88% for the identification of the locations where overwash occurred. This study proves that nearshore and foreshore morphologies have a major impact on the longshore distribution of overwash.info:eu-repo/semantics/publishedVersio

Actualización de la colección de tipos del herbario MACB, II

CARRASCO, M. A. & MARTÍN-BLANCO, C. J. 2002. Actualización de la colección de Tipos del Herbario MACB. Bot. Complutensis, 26: 59-62. Se actualiza la Colección de Tipos del Herbario MACB, presentando los Typus de siete nombres. Señalamos la categoria de cada Tipo y los herbarios que tienen material tipo de los mismos taxones. Los nuevos Tipos son: 2 Holotypus, 4 Isotypus, 1 Isolectotypus y 2 Sintypus.CARRASCO, M. A. & MARTÍN-BLANCO, C. J. 2002. Update of the MACB type collection, II. Bot. Complutensis, 26: 59-62. In this paper the Type collection of the MACB Herbarium is update. We indicate the category of seven names (Holotypus, Isotypus Isolectotypus or Sintypus), as well as the herbariums with other type specimens of the same taxa. The new Typus are: 2 Holotypus, 4 Isotypus, 1 Isolectotypus and 2 Sintypus

El Nuevo Consenso Macroeconómico y la mediocridad del crecimiento económico en México

In this paper we study the theoretical model and its application as economic policy of the New Consensus Macroeconomics in Mexico. We focus in fiscal and monetary policy in the last 30 years. We critically revise empirical economic literature on the effects of the process of adjustment and reforms in Mexican economy after the burst of the debt crisis. Finally, we analyse the explanatory hypothesis about the low growth of Mexican economy related to the weakness of property right protection. Our main conclusion states that, given the preferences of price stability imposed by the central bank and the disdain of fiscal policy in areas such as public investment, agents do not invest due to the deterioration of expectations of future growth of the Mexican economy and low expected returns to investment

El Nuevo Consenso Macroeconómico y la mediocridad del crecimiento económico en México

In this paper we study the theoretical model and its application as economic policy of the New Consensus Macroeconomics in Mexico. We focus in fiscal and monetary policy in the last 30 years. We critically revise empirical economic literature on the effects of the process of adjustment and reforms in Mexican economy after the burst of the debt crisis. Finally, we analyse the explanatory hypothesis about the low growth of Mexican economy related to the weakness of property right protection. Our main conclusion states that, given the preferences of price stability imposed by the central bank and the disdain of fiscal policy in areas such as public investment, agents do not invest due to the deterioration of expectations of future growth of the Mexican economy and low expected returns to investment

A Simflowny-based high-performance 3D code for the generalized induction equation

In the interior of neutron stars, the induction equation regulates the long-term evolution of the magnetic fields by means of resistivity, Hall dynamics and ambipolar diffusion. Despite the apparent simplicity and compactness of the equation, the dynamics it describes is not trivial and its understanding relies on accurate numerical simulations. While a few works in 2D have reached a mature stage and a consensus on the general dynamics at least for some simple initial data, only few attempts have been performed in 3D, due to the computational costs and the need for a proper numerical treatment of the intrinsic non-linearity of the equation. Here, we carefully analyze the general induction equation, studying its characteristic structure, and we present a new Cartesian 3D code, generated by the user-friendly, publicly available {\em Simflowny} platform. The code uses high-order numerical schemes for the time and spatial discretization, and relies on the highly-scalable {\em SAMRAI} architecture for the adaptive mesh refinement. We present the application of the code to several benchmark tests, showing the high order of convergence and accuracy achieved and the capabilities in terms of magnetic shock resolution and three-dimensionality. This paper paves the way for the applications to a realistic, 3D long-term evolution of neutron stars interior and, possibly, of other astrophysical sources.Comment: 23 pages, 13 figures. In pres

Más plantas interesantes de los volcanes de Ciudad Real (España)

SANTAMARÍA, C., C. J. MARTÍN-BLANCO & M. A. CARRASCO. 2002. Más plantas interesantes de los volcanes de Ciudad Real (España). Bot. Complutensis 26: 47-51. En este trabajo damos noticia de 10 taxones recolectados sobre materiales volcánicos, que son novedades para el catálogo de la flora vascular de Ciudad Real, o están poco representados en la provincia. De ellos, Teucrium spinosum se cita por primera vez en Castilla-La Mancha. Ononis spinosa subsp. spinosa, Crepis foetida subsp. foetida y Senecio sylvaticus son primeras citas en Ciudad Real. Confirmamos la presencia en la provincia de Reichardia picroides, Schismus barbatus y Juncus striatus cuya única referencia hasta ahora era la antigua y poco precisa de Gandoger en Sierra Morena. Por último Scleranthus verticillatus, Vicia lutea subsp. vestita, y Aster squamatus son segundas citas provinciales. Los pliegos de referencia se encuentran depositados en el herbario MACB (Herbario de la Facultad de Ciencias Biológicas de la Universidad Complutense de Madrid).SANTAMARÍA, C., C. J. MARTÍN-BLANCO & M. A. CARRASCO. 2002. Some more plants with chorological interest from the volcanic region of Ciudad Real (Spain). Bot. Complutensis 26: 47-51. In this paper we present 10 taxa of vascular plants collected on volcanic soils in Ciudad Real province, Spain. Among them, Teucrium spinosum are the first record in Castilla-La Mancha, Ononis spinosa subsp. spinosa, Crepis foetida subsp. foetida and Senecio sylvaticus are the first provincial records and Scleranthus verticillatus, Vicia lutea subsp. Vestita and Aster squamatus are cited by the second time in Ciudad Real province. Also, we confirm the presence in this province of Reichardia picroides, Schismus barbatus and Juncus striatus, whose only previous reference, dated at the beguining of the last century, are the ancient and imprecise due to Gandoger from Sierra Morena. The sheets that testified this records are kept in the herbarium of Faculty of Biological Sciences of the University Complutense of Madrid (MACB)