H. Solari Yrigoyen, Así son las Malvinas, Buenos Aires, Hachette, 1959, 184 p.

Fil: F.de Martín, N.. Universidad Nacional de Cuyo. Facultad de Filosofía y Letra

LA CONSTRUCCIÓN DE LA ARQUITECTURA ORGANIZATIVA EN LAS ENTIDADES SIN FINES DE LUCRO. EL CASO DE LAS ONGD EN ESPAÑA

RESUMENEl objetivo del presente trabajo es valorar el equilibrio de las fuerzas organizativas en la construcción de una arquitectura organizativa eficiente y, todo ello, bajo un enfoque de agencia. Los resultados del análisis empírico, llevado a cabo en las más importantes ONGD españolas durante el año 2003, ponen de relieve la gran importancia de la influencia mutua de la delegación de derechos de decisión, sistemas de incentivos y el uso de medidas de evaluación del rendimiento en el logro del equilibrio organizativo, lo que nos permite afirmar que, para el caso estudiado, la teoría se confirma.ABSTRACTThe aim of this paper is to evaluate the balance of organizational components in the design of an efficient organizational architecture from an agency perspective. The results of the empirical analysis, performed in the most prominent Spanish NGDO throughout the year 2003, show the great importance of the mutual influence among the delegation of decision rights, the incentive systems and the use of performance measurements in the achievement of organizational equilibrium

Organic Molecules in the Galactic Center. Hot Core Chemistry without Hot Cores

We study the origin of large abundances of complex organic molecules in the Galactic center (GC). We carried out a systematic study of the complex organic molecules CH3OH, C2H5OH, (CH3)2O, HCOOCH3, HCOOH, CH3COOH, H2CO, and CS toward 40 GC molecular clouds. Using the LTE approximation, we derived the physical properties of GC molecular clouds and the abundances of the complex molecules.The CH3OH abundance between clouds varies by nearly two orders of magnitude from 2.4x10^{-8} to 1.1x10^{-6}. The abundance of the other complex organic molecules relative to that of CH3OH is basically independent of the CH3OH abundance, with variations of only a factor 4-8. The abundances of complex organic molecules in the GC are compared with those measured in hot cores and hot corinos, in which these complex molecules are also abundant. We find that both the abundance and the abundance ratios of the complex molecules relative to CH3OH in hot cores are similar to those found in the GC clouds. However, hot corinos show different abundance ratios than observed in hot cores and in GC clouds. The rather constant abundance of all the complex molecules relative to CH3OH suggests that all complex molecules are ejected from grain mantles by shocks. Frequent (similar 10^{5}years) shocks with velocities >6km/s are required to explain the high abundances in gas phase of complex organic molecules in the GC molecular clouds. The rather uniform abundance ratios in the GC clouds and in Galactic hot cores indicate a similar average composition of grain mantles in both kinds of regions. The Sickle and the Thermal Radio Arches, affected by UV radiation, show different relative abundances in the complex organic molecules due to the differentially photodissociation of these molecules.Comment: 18 pages, 10 Postscript figures, uses aa.cls, aa.bst, 10pt.rtx, natbib.sty, revsymb.sty revtex4.cls, aps.rtx and aalongtabl.sty. Accepted in A&A 2006. version 2. relocated figures and tables. Language editor suggestions. added reference

Multiplicity of very low-mass objects in the Upper Scorpius OB association: a possible wide binary population

We report the initial results of a VLT/NACO high spatial resolution imaging survey for multiple systems among 58 M-type members of the nearby Upper Scorpius OB association. Nine pairs with separations below 100 have been resolved. Their small angular separations and the similarity in the brightness of the components (DMagK <1 for all of them), indicate there is a reasonable likelihood several of them are true binaries rather than chance projections. Follow-up imaging observations with WHT/LIRIS of the two widest binaries confirm that their near-infrared colours are consistent with physical very low mass binaries. For one of these two binaries, WHT/LIRIS spectra of each component were obtained. We find that the two components have similar M6-M7 spectral types and signatures of low-gravity, as expected for a young brown dwarf binary in this association. Our preliminary results indicate a possible population of very low-mass binaries with semimajor axis in the range 100 AU 150 AU, which has not been seen in the Pleiades open cluster. If these candidates are confirmed (one is confirmed by this work), these results would indicate that the binary properties of very low-mass stars and brown dwarfs may depend on the environment where they form.Comment: 11 pages, 1 table, 7 figures, request high resolution copies to [email protected]

Diagenetic processes in a partially dolomitized carbonate reservoir: Casablanca oil field, Mediterranean Sea, offshore Spain

Mesozoic and Neogene carbonates located in the Valencia Trough (offshore Spain, western Mediterranean Sea) are oil reservoirs. This paper investigates the diagenetic evolution of the Upper Jurassic limestones, currently dolomitized, that constitute the main reservoir of the Casablanca oil field. Core samples from Casablanca-1A well have been studied to determine the diagenetic products and their relation with porosity evolution, and to reconstruct the fluid flow history prior to and during oil emplacement. On the basis of petrological observations and geochemical analyses (major, minor and trace element composition and oxygen, carbon and strontium isotope composition), a major dolomitization event is recognized postdating subaerial exposure, erosion and karstification. The dolomitization event originated two replacive dolomites (RD1 and RD2) and two dolomite cements (saddle dolomite cement, SDC, and milky-white dolomite cement, MDC) which are partially cogenetic. RD1, RD2 and SDC precipitated at increasing temperatures (over 60ºC and below 110ºC), probably from meteoric water mixed with marine water. The last dolomite type (milky-white dolomite cement) precipitated with increasing burial conditions and by arrival of hydrothermal fluids during the Miocene. The post-dolomitization sequence comprises precipitation of calcite cement and partial calcitization of all previous dolomites. The oxygen, carbon and strontium isotope compositions suggest that this calcite cementation occurred from meteoric waters mixed with Burdigalian - Langhian marine waters trapped in the sediments and expelled by compaction in the moderate to deep burial realm. Normal faults were the conduits for upward migration of these fluids as well as for later oil expulsion from the Burdigalian - Langhian source rocks. Late corrosion associated with organic acid-enriched fluids took place prior or simultaneously to oil migration during the Pliocene, enhancing porosity and increasing reservoir quality

Geometría, estructuras y evolución de la terminación occidental de los relieves del Orógeno Alpino-Pirenaico (NO Península Ibérica)

The geometry, structures and tectonic evolution of the western termination of the Alpine-Pyrenean Orogen relief onshore and related foreland have been studied. We present the results of structural mapping and detailed outcrop studies of Cenozoic-age structures carried out at the NW Iberian Peninsula. On the basis of this work we propose a new tectonic model for the termination. According to the identified structures, three main regions could be recognised: (1) the Astur-Galaica (AG) region or the western part of the Cantabrian Mountains (CM), characterised by thrusts with a south vergence, which are the continuation of the structures of the Pyrenees, (2) The Galaico-Leoneses Mountains (GLM), characterized by thrusts with a north vergence, and (3) The Rías Baixas-Terra Chá region (RBT) characterized by strike-slip faults with no relevant associated relief but with recent seismic activity, which represents the less deformed Alpine foreland. The western termination of the Alpine-Pyrenean Orogen is formed due to the superposition of two mountain ranges (CM and GLM) and a complex tectonic evolution. The CM were emplaced southwards and subsequently the GLM was emplaced northwards. The western limit of the E-W thrusts of the CM and the associated relief define a N-S-oriented arch-shape structures (Ibias-Ancares and Rúa-Vilalba). Tectonic activity commenced during the Eocene, and in the westernmost areas during the Late Oligocene. The CM south-verging thrust activity ended at the beginning of Late Miocene, although deformation continued in the GLM with north-verging thrusts. The evidence of intense tectonic activity during the Miocene, the western migration and southward transference of tectonic activity and the interaction of two successive deformation fronts, suggests that a re-examination of the tectonic evolution of the northern Iberian microplate during the Alpine Orogeny is necessary.Se han estudiado las estructuras, la geometría y la evolución tectónica de la terminación occidental de los relieves del Orógeno Alpino-Pirenaico (o Cántabro Pirenaicos) y del antepaís asociado. Se presentan los resultados de la cartografía estructural y estudios detallados de campo de las estructuras tectónicas cenozoicas del NO de la Península Ibérica. Basándose en este estudio proponemos un nuevo modelo tectónico para esta terminación. En función de las estructuras tectónicas identificadas se han diferenciado tres regiones: (1) la Astur-Galaica que es la terminación más occidental de la Cordillera Cantábrica (CC) y que se caracteriza por cabalgamientos con vergencia sur y por ser la continuación natural de las estructuras que configuran el Pirineo. (2) Los Montes Galaico-Leoneses (MGL) que se caracteriza por cabalgamientos con vergencia norte. Finalmente, (3) la región de las Rías Bajas-Terra Cha que se caracteriza por fallas de desgarre con sismicidad asociada que no generan relieve importante y que representan el antepaís menos deformado. La terminación del Orógeno Alpino-Pirenaico es el resultado de la superposición de dos cadenas montañosas: la Cordillera Cantábrica (CC) que es prolongación de los Pirineos y los Montes Galaico Leoneses (MGL), con una compleja evolución tectónica. La CC se emplazó hacia el sur y posteriormente fueron los MGL los que se emplazaron hacia el norte. El límite occidental de los cabalgamientos de dirección E-O que elevan la CC son dos estructuras arqueadas de dirección N-S (Ibias-Ancares y Rúa-Vilalba). La actividad tectónica comenzó durante el Eoceno y en las zonas más occidentales es durante el Oligoceno. La actividad de los cabalgamientos de la CC finalizó al principio del Mioceno superior. Mientras tanto, la deformación continuó en los cabalgamientos de los MGL que se emplazaban hacia el norte. Las evidencias de intensa actividad tectónica durante el Mioceno, la migración hacia el oeste y la transferencia de la deformación hacia el sur, así como la interacción de dos frentes de deformación sucesivos, sugiere una revisión de la evolución tectónica del norte de la microplaca Ibérica durante la Orogenia Alpina