Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99


Any time

2019 ( 236 )

2018 ( 333 )

2017 ( 339 )

2016 ( 537 )

Custom range...

Search Results: 1 - 10 of 198552 matches for " Román "
All listed articles are free for downloading (OA Articles)
Page 1 /198552
Display every page Item
Redefinition of the Terminus of the Middle America Trench  [PDF]
Román Alvarez
International Journal of Geosciences (IJG) , 2013, DOI: 10.4236/ijg.2013.44070

The terminus of the Middle America Trench has been traditionally represented as an arc, concave towards the continent. Tres Marías Islands are located at the terminus of the Middle America Trench in western Mexico, and their location is not only intriguing but also a key to the re-construction of the position of Baja California peninsula before separation from the North America plate. Previous re-constructions suggested various places around the location of Tres Marías Islands for the position of the tip of the peninsula, and several converge to a position that invades the area occupied by the islands, offering no explanation for the overlap. Before peninsular separation from North America, the Guadalupe trench followed a smooth curve; recreating the position of this paleo-trench yields a baseline for fixing the position of the peninsula, as well as the original position of the Tres Marías Islands fragment. A new tectonic view of the structure of the Middle America Trench terminus is proposed, replacing the traditional arc representation with a series of en echelon blocks, the northernmost terminates at the Tres Marías Escarpment. The long sides of the blocks correspond to previously identified geological faults in the Bahía de Banderas region, while their offshore continuation is supported by topographic observations. As a test of this model I show the corresponding re-construction of the position of Baja California prior to separation from the North America plate and the positional evolution of the peninsula and the Tres Marías fragment from Chron 4n.2 (7.90 Ma) to Chron 3n.4 (5.12 Ma).

Southward Migration of Magmatic Activity in the Colima Volcanic Complex, Mexico: An Ongoing Process  [PDF]
Román Alvarez, Vsevolod Yutsis
International Journal of Geosciences (IJG) , 2015, DOI: 10.4236/ijg.2015.69085
Abstract: The Colima Volcanic Complex trends in a nearly N-S direction in western Mexico, and one of itsstructures, Colima volcano, is the most historically active volcano in the country. Immediately to theN, there is another volcanic center called El Cántaro volcano, whose activity started around 1.7 Ma in its N portion and migrated to the S in various episodes. Volcanic activity migrated further south, from El Cántaro to the Colima Volcanic Complex where the southernmost manifestation, Hijos del Volcán domes, is located on the south slope of Fuego volcano. The above date appears to mark initiation of the rather continuous volcanic activity in the area. It has been noted that these volcanic manifestations lie on, or near the Rivera-Cocos inland plate boundary. Colima’s Fuego volcano is also the closest to the Middle America Trench, among the polygenetic volcanoes in Mexico. We submit that the anomalous location of volcanism in this area originates in an anomalous subduction process of the Rivera and Cocos plates and evoke a tectonic model, proposed elsewhere, to support the idea. Modeling gravimetric and aeromagnetic data we locate the magma chambers of the Fuego (active) and Nevado (extinct) volcanoes within a 65 mGals negative Bouguer anomaly elongated in a nearly N-S direction. The corresponding aeromagnetic map displays a magnetic high over the southern portion of the Fuego volcano edifice. We found two additional, associated structures whose anomalies have not been previously reported, which appear to follow the southward magmatic migration pattern. One of them is a collapse structure with a circular topographic expression, and the southernmost is a low-density intrusion ~1 km below sea level, associated with a moderate topographic bulge at the surface that we interpret as a magma body. Five lines cross the anomalies; gravimetric and magnetic fields are concurrently modeled along them to locate the magmatic bodies. In addition to the 2-D models we perform 3-D gravimetric and magnetic inversions. For each field a 3-D mesh is built under the area occupied by the Colima Volcanic Complex, the volume elements are then assigned density or magnetic susceptibility values and their surface contributions in various points are evaluated. The process is
Experiencia espa?ola en el dise?o de políticas de información y documentación
Román Román, Adelaida;
Ciência da Informa??o , 1997, DOI: 10.1590/S0100-19651997000300012
Abstract: evolution of the spanish experience in the design of information and documentation policies. analysis os today's challenges that are being faced by spain points to the need of new governmental programs, nevertheless all the positive impacts of the european union' policies in the field of information.
Implications of Musical Education in Creativity Develop  [PDF]
óscar Costa Román, Vicenta Gisbert Caudeli
Creative Education (CE) , 2019, DOI: 10.4236/ce.2019.101016
Abstract: Nowadays society requires people to be capable of resolving the existing problems and creating new ones. But also it is necessary to develop people available to understand and love arts and also to prepare able people practice it like expression forms. In contrast, in the Spanish education politicization, there are important differences between regions about the study loads of arts and creativity. In these lines it is presented the next paper where the authors make a review about creativity, the situation of musical education and the connection between musical education and creativity in the Spanish’s primary school with the target of increasing the students’ cognitive development.
Role of Oxidants in Interstitial Lung Diseases: Pneumoconioses, Constrictive Bronchiolitis, and Chronic Tropical Pulmonary Eosinophilia
William N. Rom
Mediators of Inflammation , 2011, DOI: 10.1155/2011/407657
Abstract: Oxidants such as superoxide anion, hydrogen peroxide, and myeloperoxidase from activated inflammatory cells in the lower respiratory tract contribute to inflammation and injury. Etiologic agents include inorganic particulates such as asbestos, silica, or coal mine dust or mixtures of inorganic dust and combustion materials found in World Trade Center dust and smoke. These etiologic agents are phagocytosed by alveolar macrophages or bronchial epithelial cells and release chemotactic factors that recruit inflammatory cells to the lung. Chemotactic factors attract and activate neutrophils, eosinophils, mast cells, and lymphocytes and further activate macrophages to release more oxidants. Inorganic dusts target alveolar macrophages, World Trade Center dust targets bronchial epithelial cells, and eosinophils characterize tropical pulmonary eosinophilia (TPE) caused by filarial organisms. The technique of bronchoalveolar lavage in humans has recovered alveolar macrophages (AMs) in dust diseases and eosinophils in TPE that release increased amounts of oxidants in vitro. Interestingly, TPE has massively increased eosinophils in the acute form and after treatment can still have ongoing eosinophilic inflammation. A course of prednisone for one week can reduce the oxidant burden and attendant inflammation and may be a strategy to prevent chronic TPE and interstitial lung disease. 1. Introduction Gaseous and particulate air pollutants activate inflammatory cells to release oxidants such as superoxide anion, hydrogen peroxide, and hydroxyl radicals [1]. Oxidants damage proteins, lipids, DNA forming nitrotyrosine, 4-OH-2-nonenal, and 8-OHdeoxyguanosine, and single strand breaks [2]. Oxidants from macrophages and bronchial epithelial cells cause inflammation leading to injury and fibrosis [3]. These events are particularly important to the upper airways leading to asthma and constrictive bronchiolitis and to the lower respiratory tract where exogenous oxidants can activate macrophages to release endogenous oxidants, attract other inflammatory cells, and injure the delicate walls of the peripheral respiratory bronchioles and alveolar sacs [4]. The respiratory tract is a target organ for cigarette smoke, inorganic dusts (asbestos, silica, and coal), PM2.5, and World Trade Center dust contributing to asthma, COPD, fibrosis, and constrictive bronchiolitis [5]. Oxidants in the lung can be from endogenous sources since air pollutants activate neutrophils, alveolar macrophages, eosinophils, and epithelial cells. Antioxidants include superoxide dismutase and glutathione
Política monetária e oferta de dinheiro no Uruguay (1931 a 1959): novos contextos e novos instrumentos
Román Ramos,Carolina;
Ensayos sobre POLíTICA ECONóMICA , 2012,
Abstract: this paper analyses the main characteristics of the monetary policy in the period 1931-1959 and its changes related to the national and international context. two were the most important transformations. on one hand the increasing role of the republic bank of uruguay in the conduction of the monetary and exchange-rate policy. on the other hand, there were important changes in the monetary regime evolving to a more flexible system as the gold standard was abandoned. in addition, we describe the evolution of the monetary supply, the link with the economic activity and a first approximation to the relation between money and prices.
Submarine topography and faulting in Bahía de Banderas, Mexico
Alvarez, Román;
Geofísica internacional , 2007,
Abstract: a digital elevation model of bahía de banderas and its offshore continuation to the middle america trench (mat) is built from a data set of 6872 bathymetric soundings. two new, offshore basins and several, previously unknown faults within the bay are also identified. the south flank of banderas canyon is considerably steeper than the north one. this asymmetry and the seismic activity present lead to propose that banderas canyon has a half-graben structure of the fault growth type, and reverse drag geometry, which originates in an extensional basin oriented n-s. the canyon is divided in two sections that trend in different directions. the older section of the canyon, trending e-w, is probably late miocene; the associated banderas fault is suggested to extend westward, down to the mat along a section that complements that of the half-graben. the section of banderas canyon trending ne and continuing into banderas valley is identified as a younger portion of the structure. the older and the younger portions of the canyon appear to be active presently. a group of faults also trending ne seem to be associated with the change in direction of the canyon. these results support the hypothesis that the structure of banderas canyon is a half-graben, and strengthen the idea that it is the limit between the region to the north that underwent extension in the miocene, and the region to the south that did not experienced it.
El deseo, el cuerpo y el secreto, como formas de subjetivación en María Luisa Bombal
Aisthesis , 2012, DOI: 10.4067/S0718-71812012000100011
Abstract: the problem of desire in the literature of gilles deleuze may be understood from two distinct perspectives. on the one hand, we have the bio-political interpretation of desire, from which the techniques of subjection have developed, while on the other, there is the construction of desire as an autonomous and creative reality that tends toward its own subjectification. the narrative of maría luisa bombal is situated precisely at the crossroads between these two perspectives. her novels and stories confront the dilemma of how to articulate feminine desire, in which the already rigid silence becomes even more unyielding in the presence of a subjective agency.
Dos Tiempos para la Utopía: Festivales de Cine Latinoamericano
Román R,José;
Aisthesis , 2010, DOI: 10.4067/S0718-71812010000200002
Abstract: the two latin american film festivals that were carried out in vi?a del mar in 1967 and 1969 were connected by their themes: the bonds between films and politics. the exhibited films come from movements known as the ?new cinema?, which was opposed to the commercial films screened in movie theaters all around the continents. most of them were trying to represent the social and politic reality in their countries. in parallel to the films screening, the invited filmmakers debated about themes that were relevant to context of the continent in those years (social inequality, cultural dependence, dictatorial regimes, police violence) as well as the aesthetics, cultural and political proposals in which every country based its cinematogrphic experiences. thus, the following article will analyze the most important films and theoretical proposals that characterised those screening, as well as the invited latin american filmmakers.
Magallania (Punta Arenas) , 2005, DOI: 10.4067/S0718-22442005000200012
Abstract: preliminary information about the finding of two maritime hunter-gatherer sites in englefield island is presented. radiocarbon dates that locate them between the sixth and fifth millennium bp have been obtained. the characteristics of the bone industry recovered at one of these sites allow identifying it as part of the englefield cultural tradition (emperaire y laming 1961; legoupil 1997).
Page 1 /198552
Display every page Item

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