oalib
Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
Durmiendo bajo el faro: Estudio de un entierro humano en Cabo Vírgenes (C.V.17), provincia de Santa Cruz, República Argentina  [cached]
Gabriela L. L'Heureux,Ricardo A. Guichón,Ramiro Barberena,Luis A. Borrero
Intersecciones en Antropología , 2003,
Abstract: En este trabajo se presenta el hallazgo y estudio de un entierro indígena (C.V.17) en Cabo Vírgenes, Provincia de Santa Cruz, República Argentina. El sitio consiste en una estructura de piedras disturbada antrópicamente y parcialmente oculta por la formación de un médano, de la cual se recuperaron dos individuos adultos de distinto sexo depositados en forma superpuesta. Se presentan y discuten a nivel regional los resultados de los estudios bioantropológicos y tafonómicos del conjunto óseo y de los análisis de isótopos estables realizados a ambos individuos. Esta información permitió inferir que el sitio correspondía a una estructura de entierro reutilizada por poblaciones cazadoras recolectoras que hicieron un uso del área en forma marginal, aunque planificada, durante el Holoceno tardío. This paper presents the study of a burial (C.V.17) from Cabo Vírgenes, Santa Cruz Province, Argentina. Two adult individuals - one male and one female - were deposited within a stone structure covered by a sand dune. Evidence of recent anthropic disturbance was recorded. Bioanthropological and taphonomic analyses and stable isotopes studies are presented and discussed in relation to the general information for the area. It is concluded that the burial place was used successively by hunter-gatherers that marginally, but systematically, occupied the area during the late Holocene.
Sand Waves Generation: A Numerical Investigation of the Infiernillo Channel in the Gulf of California  [PDF]
Yovani Monta?o Ley, Noel Carbajal
Open Journal of Marine Science (OJMS) , 2016, DOI: 10.4236/ojms.2016.63035
Abstract: The effect of the coastal geometry on sand bed forms generation has been investigated for a tidal dominated area. Different hypothetical geometries of coastal channels with flat bottoms and unlimited sediment availability were exposed to strong oscillatory tidal currents to simulate the interaction of hydrodynamics and the bedload sediment transport. The hypothetical geometries stand for the idealization of the principal geographic features of the Infiernillo Channel, a coastal area of the Gulf of California where sandbanks and sand waves have been observed. A depth integrated hydrodynamic-numerical model and a parameterized formula to estimate the bedload sediment transport were applied coupled with a sediment conservation equation to determine the sea bottom morphodynamics. Model predictions in the Infiernillo Channel were compared to available satellite imagery. This investigation demonstrates that a vertical integrated numerical model is able to reproduce the development of incipient sand waves that exist in the Infiernillo Channel. Incipient sandbanks and shoals were also simulated. Sand waves with wavelengths of about 200 m were calculated on the same locations where sand waves actually exist. A crucial finding of this research was to show that the geometry of a shallow water basin and the presence of tidal velocity gradients associated with abrupt changes in the coastline alignment were critical in determining the sand-bed pattern generation. We demonstrate that a vertical variation of tidal currents is not necessary to generate sand waves.
La traición quebrada  [cached]
Virginia Castro
Prohistoria , 2007,
Abstract: Dentro de la "nueva novelística sobre la dictadura" escrita desde 1995, hay una zona que elige narrar la militancia quebrada mediante la reformulación de los tópicos del traidor y la traición según dos modelos literarios: Jorge Luis Borges o Roberto Arlt. El cruce entre ficción y política nos fuerza a leer la filiación con uno u otro no sólo como una elección estética, sino también como un pronunciamiento desde la ficción sobre un debate todavía abierto en el seno de las organizaciones guerrilleras: la sospecha de colaboracionismo con el régimen dictatorial que pesa sobre los sobrevivientes de los campos. Within the "new narrative about the dictatorship" written from 1995 on, there is a trend to write about guerrilla forces broken under official repression by reformulating the topics of the betrayer and the betrayal following two literary models: Jorge Luis Borges or Roberto Arlt. This intersection of fiction and politics forces us to read affiliation with one or the other not simply as an aesthetic choice, but also as a literary pronouncement about a debate still open in the heart of the guerrilla organizations: the suspicion of collaboration with the military regime which follows all the survivors of the camps.
EL MATERIAL CERáMICO DEL SITIO CAMISAS 6 (EMBALSE CORRALES), COMUNA DE SALAMANCA, PROVINCIA DEL CHOAPA
Urízar O.,Gabriela;
Chungará (Arica) , 2004, DOI: 10.4067/S0717-73562004000400023
Abstract: i present the results of ceramic analysis recovered at camisas 6, choapa river, 4th region. this site was studied during the rescue of archaeological sites discovered in the corrales dam area. the main goal is to give a diagnostic upon of the cultural affiliation of this site, its relations with the choapa main cultural area and the specific characteristics of the ceramic recovered
EL MATERIAL CERáMICO DEL SITIO CAMISAS 6 (EMBALSE CORRALES), COMUNA DE SALAMANCA, PROVINCIA DEL CHOAPA  [cached]
Gabriela Urízar O.
Chungará (Arica) - Revista de Antropología Chilena , 2004,
Abstract: Se presentan los resultados obtenidos a partir de la revisión del material cerámico recuperado en el sitio Camisas 6, cuenca del río Choapa, IV Región. Este sitio fue estudiado dentro de un plan de rescate de sitios arqueológicos ubicados en el área que será intervenida por el embalse Corrales, construido en la zona. El objetivo es dar una visión acerca de la afiliación cultural de este sitio, sus relaciones con lo que está sucediendo en el área del Choapa y las características específicas que presenta el material cerámico encontrado en este I present the results of ceramic analysis recovered at Camisas 6, Choapa river, 4th Region. This site was studied during the rescue of archaeological sites discovered in the Corrales dam area. The main goal is to give a diagnostic upon of the cultural affiliation of this site, its relations with the Choapa main cultural area and the specific characteristics of the ceramic recovered
Age-growth models for tilapia Oreochromis aureus (Perciformes, Cichlidae) of the Infiernillo reservoir, Mexico and reproductive behaviour
Jiménez-Badillo,Lourdes;
Revista de Biología Tropical , 2006,
Abstract: in presence of a decrease in the catch from infiernillo reservoir, michoacán-guerrero, méxico, age and growth of tilapia oreochromis aureus (steindachner 1864) were estimated, as indispensable attributes for fishery management. evaluations included scales and opercular bones readings and length frequency analysis. the population structure was determined too. due to the great variation of tilapia individual growth and with the objective to have reliable growth estimations, linearized, non-parametric and non-linear methods were used and their applicability discussed. comparison of ages determined from these methods revealed that opercular bones readings had advantages over scales. reproduction and competition for space and food were considered as responsible factors for ring-formation on tilapia hard structures. the non-linear method was considered the best for modelling populations highly variable, which is characteristic of tilapia and tropical fish with multiple spawns. the growth parameters estimated were l∞ = 479 mm, k = 0.46/yr, to = -0.055 yr. the tilapia population in infiernillo reservoir is dominated by juveniles less than 1.5 years old. the fishery activity is affecting the tilapia population growth because are caught when they have not yet spawned. therefore, this fishery is in urgent need of regulation. increasing the mesh size of the gill nets might contribute to protect the reproductive potential of the stock. rev. biol. trop. 54(2): 577-588. epub 2006 jun 01.
Caracterización genética del distrito minero El Infiernillo, bloque de San Rafael, provincia de Mendoza Genesis of El Infiernillo Mining District, San Rafael Block, Mendoza  [cached]
Anabel Gómez,Nora Rubinstein
Revista de la Asociación Geológica Argentina , 2010,
Abstract: El distrito minero El Infiernillo está ubicado en el Bloque de San Rafael (34o38'20"S; 68o47'37"O), Mendoza. Comprende un depósito tipo cobre porfírico emplazado en piroclastitas en las que desarrolla un patrón de alteración concéntrico con un núcleo de cuarzo rodeado de una zona con alteración potásica y externamente un halo fílico con vetas polimetálicas asociadas. El halo potásico presenta una asociación de feldespato potásico-cuarzo-(biotita). Se reconocen al menos tres pulsos de silicificación relacionados con esta etapa, uno de los cuales (de temperatura entre 550° y 390°C y salinidad entre 35 y 47 %) da lugar a la mineralización de Cu. La alteración fílica está conformada por cuarzo-illita-(rutilo) acompa ada, en sectores, por albita que indica un estadio temprano dentro de esta etapa. Las texturas e inclusiones fluidas reconocidas en el núcleo de cuarzo sugieren una somerización del sistema hidrotermal durante su evolución. La secuencia paragenética del diseminado comprende bornita, calcopirita-molibdenita, pirita, (galena-esfalerita). La presencia de venillas de molibdenita-cuarzo indica la transición de la etapa potásica a la fílica mientras que las venillas de pirita-cuarzo se alan el pasaje a un régimen de deformación frágil durante el cual se emplazan las vetas con una paragénesis general de calcopirita-esfalerita, pirita, (Ag) tetraedrita, galena. La geoquímica de la roca de caja permite correlacionarla con la sección inferior del ciclo magmático Choiyoi y el control del magmatismo y la estructura permite asignarle al depósito una edad pérmica inferior a pérmica media a superior. El Infiernillo Mining District is located in the San Rafael Block (34o38'20";68o47'37"), province of Mendoza, Argentina. It is a porphyry Cu (Mo) type deposit which is hosted by a volcaniclastic sequence. It develops an alteration halo with a concentric pattern consisting of a central quartz neck surrounded by a potassic alteration zone and outwards a phyllic halo and small polymetallic veins. The potassic halo has a paragenesis of K-feldspar-quartz-(biotite). Three silicification phases are related to this alteration stage, one of them (with temperature between 550° and 390°C and salinity between 35 and 47 %) genetically linked to the copper mineralization. The phyllic alteration consists of quartz-illite-(rutile) with minor albite. The albitization process points out to an early phase of this phyllic stage. The fluid inclusions together with the textures of the quartz neck suggest the shallowing of the active hydrothermal system. The disseminated ore paragenesis
Age-growth models for tilapia Oreochromis aureus (Perciformes, Cichlidae) of the Infiernillo reservoir, Mexico and reproductive behaviour  [cached]
Lourdes Jiménez-Badillo
Revista de Biología Tropical , 2006,
Abstract: In presence of a decrease in the catch from Infiernillo reservoir, Michoacán-Guerrero, México, age and growth of tilapia Oreochromis aureus (Steindachner 1864) were estimated, as indispensable attributes for fishery management. Evaluations included scales and opercular bones readings and length frequency analysis. The population structure was determined too. Due to the great variation of tilapia individual growth and with the objective to have reliable growth estimations, linearized, non-parametric and non-linear methods were used and their applicability discussed. Comparison of ages determined from these methods revealed that opercular bones readings had advantages over scales. Reproduction and competition for space and food were considered as responsible factors for ring-formation on tilapia hard structures. The non-linear method was considered the best for modelling populations highly variable, which is characteristic of tilapia and tropical fish with multiple spawns. The growth parameters estimated were L∞ = 479 mm, K = 0.46/yr, t o = -0.055 yr. The tilapia population in Infiernillo reservoir is dominated by juveniles less than 1.5 years old. The fishery activity is affecting the tilapia population growth because are caught when they have not yet spawned. Therefore, this fishery is in urgent need of regulation. Increasing the mesh size of the gill nets might contribute to protect the reproductive potential of the stock. Rev. Biol. Trop. 54(2): 577-588. Epub 2006 Jun 01. Ante el continuo decremento en las capturas de tilapia de la presa Infiernillo, Michoacán- Guerrero, México, se estimó la edad y crecimiento de Oreochromis aureus (Steindachner 1864) que son atributos indispensables que deben conocerse para realizar el manejo de la pesquería. La evaluación incluyó la lectura de marcas de crecimiento en escamas y opérculos, y el análisis de frecuencia de tallas. También se estimó la estructura de edad de la población. Debido a la alta variabilidad individual en el crecimiento que presentan las tilapias y a fin de obtener estimaciones fidedignas de crecimiento, diferentes métodos lineales, noparamétricos y no-lineales fueron usados y su aplicación discutida. Los opérculos presentaron ventajas sobre las escamas en la determinación de edad. La reproducción y la competencia por espacio y alimento fueron consideradas factores responsables de la formación de marcas en las estructuras duras de tilapia. El modelo no-lineal fue considerado el mejor para modelar el crecimiento de poblaciones altamente variables como la de tilapia y otros peces tropicales que pr
Effects of leaf removal and cluster thinning on yield and quality of grapes (Vitis vinifera L., Riesling × Silvaner) in Corrales, Boyaca (Colombia)  [cached]
Balaguera López Helber Enrique,Almanza Merchán Pedro José,Fischer Gerhard
Agronomía Colombiana , 2011,
Abstract: The vineyards that are located in the Colombian cool tropicalzone of Corrales (Boyaca department) offer grapes for the production of quality wines; to improve the crop we must know the adequate balance between the quantity of clusters and the leaf area of the plants. In order to determine the effect of leaf removal and cluster thinning on yield and quality of the clonal selection Riesling × Silvaner wine grape, it was used a completely randomized bifactorial design of 2x3. The first factor was removal of leaves (without defoliation and 60% defoliation) and the second one was cluster thinning (maintaining 66% or 33% of clusters per plant). Plants with 66% clusters and without leaf removal exhibited the highest total soluble solids content and yield of grapes, in fresh mass of clusters and fresh and dry mass of grapes. Plants without cluster thinning, but with removal of leaves, produced the lowest pH levels and total titratable acidity in the grapes. The technical maturity index was significantly higher in plants without leaf thinning; but was not affected by removed clusters. Thinning clusters is an alternative to improve production and the quality of wine grapes.
El entierro de Agua Verde: Variables bioarqueológicas para el estudio de la complejización social  [cached]
Verónica Williams,María de Hoyos
Intersecciones en Antropología , 2001,
Abstract: Se proponen posibles líneas de investigación para el análisis de fenómenos sociales a partir de un contexto mortuorio particular, el entierro de Agua Verde en la provincia de Catamarca. Se hacen inferencias sobre dieta, patologías, organización social, estatus, etc. a partir de dos fuentes de información: la que surge del estudio de las prácticas mortuorias (disposición y ubicación de la tumba, disposición del cuerpo, el ajuar, etc.) y los resultados del análisis esqueletario (patologías, dieta, deformaciones, etc.). Los resultados de estos análisis se relacionaron con antecedentes arqueológicos (entierros en urnas y características estilísticas de la cerámica que conforman el ajuar) e históricos (documentos) de la región. Finalmente, dadas las limitaciones por tratarse de un único entierro, planteamos una serie de interrogantes y perspectivas que permitirían abrir futuras líneas de investigación. Possible lines of research for analyzing social phenomenon are proposed through a particular mortuary context, that of the Agua Verde burial in Catamarca Province . Inferences are made on diet, pathologies, social organization, status, etc. from two sources of information: from the study of mortuary practices such as location of the tomb, position of the corpse, burial goods, etc, and from skeletal analyses such as diet, pathologies, deformations, etc. Results from these analyses are related to archaeological antecedents (burials in urns, stylistic characteristics of burial goods) and historical background from the region. Finally, taking into account the limitations of this single burial, we propose a series of questions and perspectives that will open up future lines of research.
Page 1 /100
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.