1,427 research outputs found
Reactivación cultural mapuche y procesos etnopolíticos en la ciudad. Las oficinas de asuntos indígenas en la Región Metropolitana, Chile
No full textFil: Espinoza Araya, Claudio. Universidad Academia de Humanismo Cristiano. Escuela de Antropología; Chile.Fil: Espinoza Araya, Claudio. Comisión Nacional de Investigación Científica y Tecnológica. Centro de Estudios Interculturales e Indígenas; Chile.Fil: Carmona Yost, Rosario. Universidad Academia de Humanismo Cristiano; Chile
Lagrangian Relaxation for an Inventory Location Problem with Periodic Inventory Control and Stochastic Capacity Constraints
No full textIndexación: Scopus.We studied a joint inventory location problem assuming a periodic review for inventory control. A single plant supplies a set of products to multiple warehouses and they serve a set of customers or retailers. The problem consists in determining which potential warehouses should be opened and which retailers should be served by the selected warehouses as well as their reorder points and order sizes while minimizing the total costs. The problem is a Mixed Integer Nonlinear Programming (MINLP) model, which is nonconvex in terms of stochastic capacity constraints and the objective function. We propose a solution approach based on a Lagrangian relaxation and the subgradient method. The decomposition approach considers the relaxation of different sets of constraints, including customer assignment, warehouse demand, and variance constraints. In addition, we develop a Lagrangian heuristic to determine a feasible solution at each iteration of the subgradient method. The proposed Lagrangian relaxation algorithm provides low duality gaps and near-optimal solutions with competitive computational times. It also shows significant impacts of the selected inventory control policy into total system costs and network configuration, when it is compared with different review period values. © 2018 Claudio Araya-Sassi et al.https://www.hindawi.com/journals/mpe/2018/8237925
Caratteri del metamorfismo ercinico nella fillade sudalpina ad ovest di Bressanone.
No full textThe aim of this paper is to contribute to the solution of the numerous problems concerning the South-Alpine crystalline basement of the Eastern Alps. An area located west of Bressanone (Brixen) (Fig. 1) was considered and the petrographic and microtextural features of its metapelites analyzed. The main rock-types are quartz-phyllites and phyllitic schists, within which metarhyolites ("porphyroids"), quartzites and metabasites are interlayered.
The distinction between the upper ("M. Cavallino Formation", "M. Cane Phyllites") and the lower ("Bressanone Phyllites") phyllitic complex is only possible according to mesostructural criteria: the metapelites making up the two complexes do display identical micro- and mesoscopic features. In particular, the almandine-biotite phyllites, which display the most complicated tectono-metamorphic history, have identical mineral assemblages in the two rock complexes, identical chemistry of the main mineral phases (Tables 1-4) and identical microtextural relationships between crystallization and deformation.
The tectono-metamorphic history of the considered metapelites was reconstructed. It consists of five crystallization stages, including two thermal climaxes which correspond to the higher-temperature part of the greenschists facies. The mineral compatibilities of each crystallization stage were also ascertained (Figs. 8-11).
Geothermometric estimations were deduced from the prevailing mineral assemblages (Fig. 13). Geobarometric estimations were based on the b value of the potassic white micas: the mean b value (8.774A) indicates low-pressure conditions of about 3 Kb. Considering the pattern of the b isopleths in the P-T field, an approximate value of 40°C/Km was assigned to the metamorphic thermal gradient of the Hercynian event
New chemical data on the upper Ordovician acidic plutonism in the Austrides of the Eastern Alps.
No full textThe Upper Ordovician acidic magmatism is the most important magmatic activity in the Eastern Alps, both as concerns amount of melts and size of the area. It took place both under plutonic and volcanic conditions.
New chemical data on this plutonism are presented here. They concern rock samples from Oetztal, Pitztal and Casies Valley (Gsiestal). These new chemical data cover the SiO2 range 67-77 wt%. The data points cluster along a more or less well-defined pattern in several variation diagrams concerning major and trace elements, including REE.
These new data are compared with previously published data concerning: (i) similar Austridic orthogneisses; (ii) Austridic sheet-like gneisses, augengneisses and "porphyroids"; (iii) Southalpine "porphyroids". The variation diagrams based on all these data support the following considerations consistently with the conclusion reached by some previous authors:
- Upper Ordovician plutonism and volcanism display identica1 chemical features, and can be related to a unique cycle of magma generation;
-numerous patches of melts formed in different places in a relatively short time range under identically constrained conditions at expenses of similar parent rocks, so that all these patches of melts could have taken similar geochemical features;
- these melts display a calc-alkaline affinity, covering almost continuously the 62-77 SiO2 range without any significant gap;
- the lack of cogenetic basic rocks and the insignificant amount of intermediate rocks represent a feature which is meaningful for the genetic interpretation;
-crustal anatexis seems to be the most appropriate process for explaining all available data
The beginnings of pPhilosophy in Greece
No full textHow can we talk about the beginnings of philosophy today? How can we avoid the conventional opposition of mythology and the dawn of reason and instead explore the multiple styles of thought that emerged between them? In this acclaimed book, available in English for the first time, Maria Michela Sassi reconstructs the intellectual world of the early Greek “Presocratics” to provide a richer understanding of the roots of what used to be called “the Greek miracle.”
The beginnings of the long process leading to philosophy were characterized by intellectual diversity and geographic polycentrism. In the sixth and fifth centuries BC, between the Asian shores of Ionia and the Greek city-states of southern Italy, thinkers started to reflect on the cosmic order, elaborate doctrines on the soul, write in solemn Homeric meter, or, later, abandon poetry for an assertive prose. And yet the Presocratics, whether the Milesian natural thinkers, the rhapsode Xenophanes, the mathematician and “shaman” Pythagoras, the naturalist and seer Empedocles, the oracular Heraclitus, or the inspired Parmenides, all shared an approach to critical thinking that, by questioning traditional viewpoints, revolutionized knowledge.
A unique study that explores the full range of early Greek thinkers in the context of their worlds, the book also features a new introduction to the English edition in which the author discusses the latest scholarship on the subject
A Hidden Water-Harvesting System: The Sassi de Matera
No full textThe water-harvesting system of the ancient Sassi di Matera, in the Basilicata region of southern Italy, represents a clever way of living with water in an arid climate. The terrain, with its soft rocks (Calcarenite di Gravina), provided the foundation for the water-harvesting system that shaped the cave dwellings of Sassi physically, socially and culturally. People caught, guided and stored water in private and public spaces, mostly underground, ensuring its availability for all. In 1993 UNESCO declared the cave village a World Heritage Site. Unfortunately, the water-harvesting system of Sassi di Matera is no longer functioning. Its historic ingenuity is not as visible as the system deserves and its cultural and social values are almost forgotten. Using layered visual analysis – the illustrative method – knowledge can be collected and communicated in drawings to get insight regarding more resilient, circular, and people-related approaches (Bobbink, Chourairi and Di Nicola 2022). This article and the included drawings focus on the water system’s value, from which we can learn today.Landscape Architectur
Introduction
No full textA short history of (the relationship between) postcolonial studies and Scottish studies, followed by a theoretical and methodological analysis of how the book that this chapter introduces is situated in the field of postcolonial Scottish studies
Ciclo de conversaciones Antropologías del Sur: Claudio Lomnitz
No full text
En esta segunda entrevista del ciclo de conversaciones Antropologías del Sur, estuvimos con Claudio Lomnitz (Santiago de Chile, 1957), profesor de antropología en la Universidad de Columbia, Estados Unidos, y abordamos distintos temas relativos a su trabajo intelectual que abarcan la historia, la política y la cultura de América Latina, en particular de México. Lomnitz obtuvo su doctorado en la Universidad de Stanford, y su primer libro, Evolución de una sociedad rural (1982), fue un estudio sobre la política y el cambio cultural en Tepoztlán. Posteriormente, desarrolló varias pesquisas sobre el estado-nación comprendido como una región cultural compleja, derivando en la publicación del libro Salidas del laberinto. La cultura y la ideología en el espacio nacional mexicano (1992). La vida intelectual de Lomnitz está compuesta por múltiples trayectorias que pasan por las ciencias sociales en general, antropología e historia fundamentalmente, la prensa, el ensayo y el teatro. En la primera parte de la conversación, abordamos su biografía y el contexto sociopolítico en el que se formó. En la segunda, indagamos en las singularidades de la antropología histórica para examinar la cuestión nacional en el mundo contemporáneo. Finalmente, revisamos el caso de Ayotzinapa y las recientes revueltas ocurridas en Chile y América Latina, con especial énfasis en los desafíos de la antropología para contribuir en la discusión pública
Experimental study of the seismic properties of the Eastern Alps (Italy) along the Aurina-Tures-Badia Valleys transet.
No full textIn order to better constrain the interpretation and the nature of the seismic reflectors, experimental measurements at high confining pressure (up to 300 MPa) and room temperature of the compressional wave velocity (Vp) on 10 samples representative of the most common lithologies along the Aurina (Ahrntal), Tures (Tauferer Tal), and Badia (Abtei Tal) Valleys profile (Eastern Alps, Italy) have been performed. For each sample, the speed of ultrasonic waves was measured in three mutually perpendicular directions, parallel and normal to the rock foliation and lineation. The main results are: (a) Good agreement between the calculated vs. measured modal compositions of the considered rocks, indicating that they were presumably equilibrated at the estimated P-T conditions; therefore, the seismic properties are representative of the crustal level indicated by the thermobarometry. (b) Measured and calculated average Vp are in good agreement, and are typical of mid-crustal level (6.0-6.5 km/s). Only the amphibolites show Vp typical of the lower crust (7.2 km/s). (c) The seismic anisotropy of metapelites is very high (12-27%), both with orthorhombic and transverse isotropy symmetry; amphibolites are transversely isotropic with an anisotropy of 8%; orthogneisses and granitoids are isotropic or weakly anisotropic. (d) The contacts between amphibolites and all other rock types may generate good reflections, provided they are not steeply inclined. Although the metamorphic foliation remains steeply inclined, discordant buried sub-horizontal igneous contacts may be detected
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