Structure of the Chiral Scalar Superfield in Ten Dimensions

We describe the tensors and spinor-tensors included in the $\theta$-expansion of the ten-dimensional chiral scalar superfield. The product decompositions of all the irreducible structures with $\theta$ and the $\theta^2$ tensor are provided as a first step towards the obtention of a full tensor calculus for the superfield.Comment: 50 pages, UCLA/94/TEP/

Five-Brane Effective Field Theory on Calabi-Yau Threefolds

We consider the compactification of the dual form of $N=1$ $D=10$ supergravity on a six-dimensional Calabi-Yau manifold. An $N=1$ off-shell supergravity effective Lagrangian in four dimensions can be constructed in a dual version of the gravitational sector (new-minimal supergravity form). Superspace duality has a simple interpretation in terms of Poincar\'{e} duality of two-form cohomology. The resulting $4D$ Lagrangian may describe the low-energy point-field limit of a five-brane theory, dual to string theory, provided Calabi-Yau spaces are consistent vacua of such dual theory.Comment: 16 pages, LaTeX, CERN-Th.6914/93 POLFIS-TH.04/93 UCLA/93/TEP/1

Short Communication. Wood identification based on their common name and their transversal surface anatomy. Application to the batch from the expedition of Ruiz and Pavon

Aim of study: To identify species of wood samples based on common names and anatomical analyses of their transversal surfaces (without microscopic preparations).Area of study: Spain and South America.Material and Methods: The test was carried out on a batch of 15 lumber samples deposited in the Royal Botanical Garden in Madrid, from the expedition by Ruiz and Pavón (1777-1811). The first stage of the methodology is to search and to make a critical analysis of the databases which list common nomenclature along with scientific nomenclature. A geographic filter was then applied to the information resulting from the samples with a more restricted distribution. Finally an anatomical verification was carried out with a pocket microscope with a magnification of x40, equipped with a 50 micrometers resolution scale.Main results: The identification of the wood based exclusively on the common name is not useful due to the high number of alternative possibilities (14 for “naranjo”, 10 for “ébano”, etc.). The common name of one of the samples (“huachapelí mulato”) enabled the geographic origin of the samples to be accurately located to the shipyard area in Guayaquil (Ecuador). Given that Ruiz y Pavón did not travel to Ecuador, the specimens must have been obtained by Tafalla. It was possible to determine correctly 67% of the lumber samples from the batch. In 17% of the cases the methodology did not provide a reliable identification.Research highlights: It was possible to determine correctly 67% of the lumber samples from the batch and their geographic provenance. The identification of the wood based exclusively on the common name is not useful.Key words: historic wood; Ruiz and Pavon’s expedition; wood anatomy; wood identification; wood nomenclature

Angeles Sorazu (1873-1921)

Biografía de Angeles Sorazu. Nacida en Zumaya en una familia de pescadores. La familia se trasladó a Donostia-San Sebastián y después a Tolosa dónde trabajo en la fábrica de boinas y durante un tiempo tomó afición a las diversiones un tanto mundanas. Posteriormente se convirtió y se entregó totalmente a Dios. Después decide ser monja y más tarde fue nombrada Abadesa. Escribió diversas obras y opúsculos, que se publicaron después de su muerteBiography of Angeles Sorazu. She was born in Zumaya, within a family of fishermen. The family moved to Donostia-San Sebastian and later to Tolosa where she worked in the beret factory and for a certain period of her life she took a liking to somewhat worldly entertainment. She was then converted and committed herself to God. After this she become a nun and later she was appointed abbess. She wrote several books and booklets which were published after her deat

Velocity Statistics in Holographic Fluids: Magnetized Quark-Gluon Plasma and Superfluid Flow

We study the velocity statistics distribution of an external heavy particle in holographic fluids. We argue that when the dual supergravity background has a finite temperature horizon the velocity statistics goes generically as $1/v$, compatible with the jet-quenching intuition from the quark-gluon plasma. A careful analysis of the behavior of the classical string whose apparent worldsheet horizon deviates from the background horizon reveals that other regimes are possible. We numerically discuss two cases: the magnetized quark-gluon plasma and a model of superfluid flow. We explore a range of parameters in these top-down supergravity solutions including, respectively, the magnetic field and the superfluid velocity. We determine that the velocity statistics goes largely as $1/v$, however, as we leave the non-relativistic regime we observe some deviations.Comment: 32 pages, 12 figures, references added and minor correction

Una articulación metodológica: desde textos del Socio-analisis, I(A)P, F. Praxis, Evelyn F. Keller, Boaventura S. Santos, etc.

This text makes a review, following the contributions of the last decades, from different theoretical currents and practices that make the bases for participative methodologies. It revise texts from socioanalytic, participative investigation action, philosophy of praxis, a debate between constructionisms, aportations from ecofeminism, from ecology of knowledge, etc. and articulate many of this positions in a explicative diagram (of 12 positions) who try to make a differentiation and relation between practice and theory proposition showed in this pages