Buenos Aires, Argentina
Buenos Aires, Argentina
Time filter
Source Type

Yuchechen A.E.,CONICET | Lakkis S.G.,UTN | Lakkis S.G.,Pontifical Catholic University of Argentina | Canziani P.O.,CONICET
International Journal of Remote Sensing | Year: 2017

Annual anomalies of Lambertian equivalent reflectivity (LER) retrieved from the total ozone mapping spectrometer spanning the period November 1978–November 2005 were studied in the Southern Hemisphere, in a region bounded by 0° S and 60° S, and their trends were estimated. With the exception of few regions where the variable may represent the contribution of both cloudiness and snow, trends in LER anomalies provided an evolution of total cloudiness. On average, the study region experienced a net increase in LER values of 0.78 reflectivity units (RU) decade−1; if only significant trend values are considered this figure increased to 1.18 RU decade−1. The region that showed the largest upward trend, up to 4 RU decade−1, was located over the eastern Pacific, off the coasts of Chile and Peru, where the presence of marine stratocumulus is frequent. Despite the overall positive trend there were regions that yielded a negative one, most notably the tropical latitudes of South America and Africa. The yearly zonal means also showed a positive trend at all latitudes, but significance occurred beyond 20° S only. Correlation maps between LER anomalies and five different circulation indices were also introduced. The indices with the highest and lowest number of significant correlation values were the Madden–Julian oscillation at 70° E and the quasi-biennial Oscillation, respectively. © 2017 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.

Monge M.,CAECE University | D'amore M.C.,CAECE University | Muse J.,CAECE University | Jeremias N.,CAECE University | And 3 more authors.
CACIDI 2016 - Congreso Aergentino de Ciencias de la Informatica y Desarrollos de Investigacion | Year: 2016

In Argentina, nowadays, the use of walkers of different types has increased alongside an increase in the population of people over the age of 75 years. In particular, the most utilized and recommended walker model, according to Argentinian gerontologists, is the portable folding wheeled walker. However, the users of that equipment (referring to elder people), in most cases, suffer from diseases that could possibly reduce their range of vision and perception of their surroundings, affect their balance, amongst other issues. The purpose of this paper is to develop a system based on sensors and microcontrollers that, when applied to walkers, may prevent accidents and allow more mobility to the user, thus preventing dangerous situations. The idea is to detect the proximity of objects (door frames, columns, armoires, boxes) and holes in the floor that could cause injuries to elder people, allowing them to keep their eyes on the ground, paying attention to their movements and its walker. © 2016 IEEE.

Anello M.,UTN | Calero J.,UTN | Del Rosso A.,UTN | Del Rosso A.,EPRI | Caruso T.,UTN
2015 IEEE PES Innovative Smart Grid Technologies Latin America, ISGT LATAM 2015 | Year: 2015

New technologies for controlling power flow in electric networks have been developed in past few years. The new technologies are simpler, more compact and lower cost than the traditional power flow controllers such as phase shifters transformers, HVDC and FACTS devices. Such characteristics make them attractive for a variety of applications in transmission, subtransmission and distribution networks. This paper studies the use of these new power routers to increase transmission capacity and flexibility of the transmission grid, and consequently improve the utilization of the existing assets. A framework developed by Electric Power Research Institute for estimating benefits and cost of smart grid projects are used as a reference to assess the various benefits affecting different stakeholders. Two case studies performed for actual regional transmission networks of the Argentinean electric system are presented. © 2015 IEEE.

Cabanillas E.D.,CONICET | Gonzalez L.R.,University of Buenos Aires | Palacios T.A.,Comision Nacional de la Energia Atomica | Montero R.,Comision Nacional de la Energia Atomica | Saravia F.,UTN
Acta Microscopica | Year: 2012

We have studied a prehispanic bronze disc of 366 mm diameter, 3.340 kg, made ca. 500-900 AD from Argentina Northwest, employing metallurgical techniques, SEM and EDS, x-ray radiography and microprobe. We found that this piece was made by melting Cu and Sn in a double matrix. It was found that the piece was well filled but with small bubles coming from the process. Metallography suggested some hammer working near some places of the disc.

Godoy L.A.,National University of Cordoba | Boccardo A.D.,UTN | Rodriguez F.J.,UTN | Dardati P.M.,UTN
Latin American Journal of Solids and Structures | Year: 2014

This paper presents numerical results of stress concentration factors for plates perforated by corrosion. Evidence from 25 plates with corrosion perforation considered show that typical shapes may be characterized as a deviation from an ellipse or from a circle. In order to model typical perforations created by this type of corrosion, holes with non-circular boundaries have been considered in the form of cosine shape and variations from it. Two load cases are investigated: uniaxial and shear stress fields in an elastic plane stress problem. The influence of the amplitude of deviation with respect to an ellipse or circle and the local curvature of the internal boundary of the hole are studied. A simplified model of an equivalent ellipse originally proposed by Nishida is shown to provide good estimates for stress concentration factors for a range of shapes induced by corrosion.

Fernandez E.,UTN | Bogado V.,UTN | Salomone E.,CONICET | Chiotti O.,CONICET
Computers in Industry | Year: 2016

Disruptive events that take place during supply process execution produce negative effects that propagate throughout a supply chain. Event management systems for supply chains have emerged to provide functionality for monitoring schedules, managing disruption, and repairing schedules affected by a disruptive event. A Web service that provides a schedule monitoring functionality for supply chain event management was developed. This paper provides a framework to allow enterprises that hire this service to develop simulation models of monitoring processes and evaluate their ability to detect and anticipate disruptive events. The framework, based on discrete event simulation, is implemented in a library that can be used for developing and testing monitoring processes by means of a friendly interface. A marine freight transport process was used as a case study to show how a supply process and its environment can be modelled and simulated by using the library. Simulation results show the ability of this approach to anticipate disruptive events and identify critical stages of a supply process in order to prevent disruptive events. © 2016 Elsevier B.V. All rights reserved.

Arcidiacono M.J.M.,UTN | Constable L.E.,UTN | Destefanis E.,Research Center en Informatica Para la Ingenieria | Vazquez J.C.,UTN
Proceedings of the 2014 Latin American Computing Conference, CLEI 2014 | Year: 2014

In the context of productive sustainability of animal textile fibers, the possibility to achieve safe and inexpensive methods allowing to measure fiber quality is paramount for farmers pretending to compete in local and international markets. Using an image of a longitudinal cut of camelid fibers, we propose a computational method in which a Hierarchical Temporary Memory algorithm recognizes and identifies each of these fibers and a modified Gabor filter enhances and reconstructs the input image in order to reduce measurement errors of the mean diameter due to crossovers and out of focus objects. In this paper this procedure is described and results are discussed. The obtained results agree with the laboratory measurements. © 2014 IEEE.

Videla H.A.,UTN | Herrera L.K.,CSIC - Institute of Materials Science
NACE - International Corrosion Conference Series | Year: 2010

Synchrotron is a source of intense, bright light of variable wavelength. Synchrotron techniques are particularly suited to non destructive analyses or to the micro characterization of different materials including organic and inorganic materials, either amorphous or crystalline. New developments in synchrotron radiation (SR) techniques result in a significant advance to study the samples at micrometer length scale through the combination of different non-destructive techniques. The most employed till now have been synchrotron X-ray fluorescence and X-ray diffraction and, to a lesser extent, small angle scattering and infrared microscopy. The list of artwork studied using SR is made up of a large variety of materials besides metals and alloys of industrial usage. This work describes some practical cases for the use of SR in the study of corrosion products and materials, which although not strictly problems caused by bacteria, they are a reflection of the potential of this tool in the characterization e.g. of iron sulfides biotically generated by the BSR, which are made up of very small crystalline grains and sometimes amorphous. © 2010 by NACE International.

Cionco R.G.,UTN | Compagnucci R.H.,University of Buenos Aires
Proceedings of the International Astronomical Union | Year: 2011

The planetary hypothesis of solar cycle is an old idea by which the planetary gravity acting on the Sun might have a non-negligible effect on the solar magnetic cycle. The advance of this hypothesis is based on phenomenological correlations between dynamical parameters of the Sun's movement around the barycenter of the Solar System and sunspots time series. In addition, several authors have proposed, using different methodologies that the first Grand Minima (GM) event of the new millennium is coming or has already begun. We present new fully three dimensional N-body simulations of the solar inertial motion (SIM) around the barycentre of the solar system in order to perform a phenomenological comparison between relevant SIM dynamical parameters and the occurrences of the last GM events (i.e., Maunder and Dalton). Our fundamental result is that the Sun acceleration decomposed in a co-orbital reference system shows a very particular behaviour that is common to Maunder minimum, Dalton minimum and the maximum of cycle 22 (around 1990), before the present prolonged minimum. We discuss our results in terms of a dynamical characterization of GM with relation to Sun dynamics and possible implications for a new GM event. © 2012 International Astronomical Union.

Loading UTN collaborators
Loading UTN collaborators