Core-crust transition pressure for relativistic slowly rotating neutron stars

We study the influence of core-\textit{crust} transition pressure changes on the general dynamical properties of neutron star configurations. First we study the matching conditions in core-\textit{crust} transition pressure region, where phase transitions in the equation of state causes energy density jumps. Then using a surface \textit{crust} approximation, we can construct configurations where the matter is described by the equation of state of the core of the star and the core-\textit{crust} transition pressure. We will consider neutron stars in the slow rotation limit, considering perturbation theory up to second order in the angular velocity so that the deformation of the star is also taken into account. The junction determines the parameters of the star such as total mass, angular and quadrupolar momentum.Comment: 4 pages, 1 figur

E. Rodríguez Almeida: Los Tituli Picti de las ánforas olearias de la Bética I, Madrid, Editorial de la Universidad Complutense, 1989, 218 Pp. + 83 figs

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Claude Domergue: Les mines de la Péninsule Ibérique dans l’Antiquité Romaine, Roma. Ecole Fran9aise de Rome. 1990, 625 + 32 láms. + 52 figuras + 6 mapas

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Introducción

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Detection of the onset of nanocrystallization by calorimetric and magnetic measurements

It is generally accepted that measurements of the magnetic properties are more sensitive than measurements of the enthalpy changes in the detection of the onset of crystallization of ferromagnetic phases emerging from a paramagnetic amorphous alloy. In this work, it is shown that the formation of a very fine nanocrystalline microstructure can make this assumption incorrect. Under some circumstances, the nanocrystallization onset temperature obtained from magnetic techniques is higher than the one obtained from enthalpy changes. The phenomenon is explained in terms of the superparamagnetic behavior of the uncoupled nanocrystals at the very early stages of nanocrystallizatio

Rasgos sedimentológicos de la plataforma interna valenciana (tramo Oliva-La Vila Joiosa), y su relación con la geomorfología continental

[Resumen] Durante las campañas de geofísica marina de 1990 y 1992, realizadas en el litoral valenciano, (Sector Oliva-la Vila Joiosa), dentro del Proyecto La Nao, se obtuvo un amplio conjunto de muestras superficiales en la plataforma interna. Sus características texturales, biológicas y micropaleontológicas, puestas en relación con los rasgos geomorfológicos del área continental, permiten matizar la dinámica sedimentaria de este tramo. Al propio tiempo, se deducen algunos factores específicos que han contribuído a la particular distribución de los depósitos infralitorales. Destaca entre ellos la fuente de aprovisionamiento de los materiales, la paleotopografía pleistocena de la plataforma y la proporción de los elementos biógenos respecto a las poblaciónes detríticas.[Abstract] A wide amount of surface samples from the submarine shelf was obtained during the 1990-1992 marine geophysics campaigns carried out along the Valencian coastline (Oliva-la Vila Joiosa sector) within project "La Nao". Their biological, micropaleonthological and texture characteristics, compared to the geomorphological features of the corresponding continental sector, allow a better knowledge of the sedimentary dynamics of this area. Sorne specific factors contributing to the particular distribution of the infra-littoral deposits have also been revealed. Sorne outstanding ones are the supply sources of the materials, the Pleistocene paleotopography of the shelf and the proportion of biogenic elements with regard to detrictic populations