Chemical composition and sulfur-isotope ratios in DSDP Legs 69-and 70

As part of the geochemical-petrological study of basalts recovered from DSDP Hole 504B (Leg 70) on the southern flank of the Costa Rica Rift, we investigated specially the relationships between the distribution and isotopic composition of sulfur of scattered and vein sulfides on the one hand, and the observed pattern and processes of secondary alterations on the other. The following groups of observations are essential: (1) variations in the contents and isotopic composition of sulfur of different forms of sulfides are clearly interrelated and are observed solely in porous horizons established on the basis of detailed geophysical experiments; (2) the enrichment of sulfides in the light sulfur isotope decreases from the upper to the lower horizons, and within horizons in the direction of the less-altered rock; (3) the increase of d34S values of scattered sulfides in individual permeable zones parallels a decrease in the degree of iron oxidation in the contents of crystallization water, and in the concentrations of Mg, K, and Li in the rock.

Magnetic properties of basalts from DSDP Hole 69-504B

The NRM intensity, AF demagnetization characteristics, hysteresis parameters, initial susceptibility, and thermomagnetic characteristics of 18 basalt specimens from Deep Sea Drilling Project Hole 504B were determined. In six samples, the grain size was large enough to allow microprobe analysis. We conclude (1) that the dominant magnetic mineral is titanomagnetite/titanomaghemite; (2) that, except for the upper few meters of the core where the grains are in the stable monodomain state, the grain size of the magnetic mineral lies in the pseudo-single-domain range (< 10 µm); (3) that maghemitization (i.e., low-temperature (< 350°C) oxidation) has taken place. We discuss possible geological histories.

Vigo y la Expo Internacional Novísima Poesía/69 (CAV-ITDT, 1969) como materialización del intercambio. Posibilidades del concretismo

El epígrafe de Romero Brest (1969) expresa la incertidumbre respecto de la Expo Internacional Novísima Poesía/69 (1969, CAV-ITDT). ¿Por qué este desconcierto ante el contenido de la exposición? ¿Qué circunstancias en esos años hacen viable la experimentación, incluyendo poesía concreta? ¿Cómo ingresa ésta en el circuito institucional? ¿Qué formas de positividad (Foucault, 1990) adquieren los términos experimentación, concretismo, vanguardia? Las conexiones de la Expo con el concretismo se producen a partir del sistema de intercambios que genera Vigo con artistas de otros países; dejan entrever las fricciones con el modo de entender la vanguardia y las inscripciones de sentido del internacionalismo

Spatially explicit estimates of length and biomass of Micromesistius poutassou (Blue Whiting) from acoustic and trawl surveys in the North-East Atlantic in May 2005

Acoustic estimates of herring and blue whiting abundance were obtained during the surveys using the Simrad ER60 scientific echosounder. The allocation of NASC-values to herring, blue whiting and other acoustic targets were based on the composition of the trawl catches and the appearance of echo recordings. To estimate the abundance, the allocated NASC -values were averaged for ICES-squares (0.5° latitude by 1° longitude). For each statistical square, the unit area density of fish (rA) in number per square nautical mile (N*nm-2) was calculated using standard equations (Foote et al., 1987; Toresen et al., 1998). To estimate the total abundance of fish, the unit area abundance for each statistical square was multiplied by the number of square nautical miles in each statistical square and then summed for all the statistical squares within defined subareas and over the total area. Biomass estimation was calculated by multiplying abundance in numbers by the average weight of the fish in each statistical square then summing all squares within defined subareas and over the total area. The Norwegian BEAM soft-ware (Totland and Godø 2001) was used to make estimates of total biomass.

Spatially explicit estimates of length and biomass of Clupea harengus (Norwegian spring spawning herring) from acoustic and trawl surveys in the North-East Atlantic in May 2006

Acoustic estimates of herring and blue whiting abundance were obtained during the surveys using the Simrad ER60 scientific echosounder. The allocation of NASC-values to herring, blue whiting and other acoustic targets were based on the composition of the trawl catches and the appearance of echo recordings. To estimate the abundance, the allocated NASC -values were averaged for ICES-squares (0.5° latitude by 1° longitude). For each statistical square, the unit area density of fish (rA) in number per square nautical mile (N*nm-2) was calculated using standard equations (Foote et al., 1987; Toresen et al., 1998). To estimate the total abundance of fish, the unit area abundance for each statistical square was multiplied by the number of square nautical miles in each statistical square and then summed for all the statistical squares within defined subareas and over the total area. Biomass estimation was calculated by multiplying abundance in numbers by the average weight of the fish in each statistical square then summing all squares within defined subareas and over the total area. The Norwegian BEAM soft-ware (Totland and Godø 2001) was used to make estimates of total biomass.

Vigo y la Expo Internacional Novísima Poesía/69 (CAV-ITDT, 1969) como materialización del intercambio. Posibilidades del concretismo

El epígrafe de Romero Brest (1969) expresa la incertidumbre respecto de la Expo Internacional Novísima Poesía/69 (1969, CAV-ITDT). ¿Por qué este desconcierto ante el contenido de la exposición? ¿Qué circunstancias en esos años hacen viable la experimentación, incluyendo poesía concreta? ¿Cómo ingresa ésta en el circuito institucional? ¿Qué formas de positividad (Foucault, 1990) adquieren los términos experimentación, concretismo, vanguardia? Las conexiones de la Expo con el concretismo se producen a partir del sistema de intercambios que genera Vigo con artistas de otros países; dejan entrever las fricciones con el modo de entender la vanguardia y las inscripciones de sentido del internacionalismo

El 69 platense : Luchas obreras, conflictos estudiantiles y militancia de izquierda en La Plata, Berisso y Ensenada durante la Revolución Argentina

Tabla de contenidos: Conflicto social y protesta en la ciudad de La Plata : El caso del movimiento estudiantil frente a la irrupción de la Revolución Argentina / Pablo Augusto Bonavena. El PRT - La Verdad durante 1968 en La Plata, Berisso y Ensenada : Una visión a través de su prensa / Christian Castillo. El 68 platense : Primeros avances hacia un mapa de la conflictividad obrera y estudiantil / Andrés N. Cappannini, Federico Rotelle, Juan L. Besoky. Conflictividad del movimiento estudiantil y de la clase obrera platense durante el año 69 : Algunos elementos para su estudio / Agustín Nava. Acumulación de capital y conflictividad social en La Plata, Berisso y Ensenada, 1966-1969 / Pablo Romá. Grandes huelgas platenses durante la Revolución Argentina en perspectiva comparada / Marcelo Raimundo. Grandes huelgas platenses durante la Revolución Argentina en perspectiva comparada / Marcelo Raimundo.