Copiapo, Chile

University of Atacama
Copiapo, Chile

University of Atacama or UDA is a university in Chile. It is part of the Chilean Traditional Universities. The university is located in Copiapó, in the Third Region, Atacama.The University was created in 1981, as a fusion of the old Mines School of Copiapo, founded in 1857 and very prestigious in the minerals industries, this School was integrated in 1947 in early foundated Universidad Técnica del Estado, being the new U.T.E. until 1981 the most important Chilean university in applied science and the Normal School of Copiapó, founded in 1905. UDA has four Faculties: Humanities and Education, Law, Engineering, and Natural science, as well as five institutes: the Technological Institute, the Language Institute, the Center for Technical Education , the Institute for Scientific and Technological Research , and INSAMIN.The University of Atacama houses several historical monuments on campus, including the first steam engine to traverse Chile, between Copiapó and the port city of Caldera, in 1851. Wikipedia.

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Carrizo D.,University of Atacama
Proceedings - 2016 10th International Conference on the Quality of Information and Communications Technology, QUATIC 2016 | Year: 2016

In terms of capturing software requirements, the most appropriate elicitation technique must be selected, but what does this mean? This paper makes a comparison between what researchers and software engineers see as adequate technique for capturing relevant information to meet software requirements. A systematic mapping of constructs which researchers define as good techniques is presented and compared with practitioners' opinions. The study identified 13 constructs that were finally whittled down to six. The software engineers' survey showed no significant difference between these constructs. This work demonstrates the divergence of views between researchers and practitioners about the quality of software requirement elicitation techniques. The results call for more empirical research to define a common way to measure the performance of techniques and so to support their selection. © 2016 IEEE.

Carrizo D.,University of Atacama | Manriquez J.,University of Atacama
Proceedings - International Conference of the Chilean Computer Science Society, SCCC | Year: 2017

Empirical studies are one of the main inputs of Evidence-based Software Engineering to generate a body of knowledge. For this reason, it is important to know the reliability of the results applying empirical methods. This article presents a method that evaluates the reliability of empirical studies related to software engineering. For this, the authors considered aspects deal with the mitigation of threats to validity from scientific literature and generate an evaluation mechanism. The method is validated by applying it to a scientific article. Although the results seem to give a degree of reliability, it is necessary replicated in other studies to perform a calibration of the method. © 2016 IEEE.

Belinchon J.A.,University of Atacama | Davila P.,Technical University of Madrid
International Journal of Geometric Methods in Modern Physics | Year: 2017

In this paper, we study how to determine the unknown functions for the scalar tensor model (Formula presented.) where the Ricci scalar is allowed to appear in a nonlinear way. The methods followed to determine these functions are: the matter collineation approach, the Lie group method and the Lagrangian collineation approach. We find several exact analytical solutions for a cosmological model with a FRW metric. We determine that some of the results are also valid for some anisotropic metric (e.g. the self-similar ones). © 2017 World Scientific Publishing Company

Kravtsov V.V.,University of Atacama | Kravtsov V.V.,Moscow State University
Astronomical Journal | Year: 2017

We further study the unusual trend we found at statistically significant levels in some globular clusters, including NGC 3201: a decreasing iron abundance in red giants toward the cluster centers. We first show that recently published new estimates of iron abundance in the cluster reproduce this trend, in spite of the authors' statement about no metallicity spread due to a low scatter achieved in the [Fe ii/H] ratio. The mean of [Fe ii/H] within from the cluster center is lower, by Δ[Fe ii/H] = 0.05 0.02 dex, than in the outer region, in agreement with our original estimate for a much larger sample size within . We found that an older data set traces the trend to a much larger radial distance, comparable with the cluster tidal radius, at Δ[Fe/H] ∼ 0.2 dex, due to higher metallicity of distant stars. We conclude the trend is reproduced by independent data sets and find that it is accompanied by both a notable same-sign trend of oxygen abundance that can vary by up to Δ[O/Fe] ∼ 0.3 dex within and an opposite-sign trend of sodium abundance. © 2017. The American Astronomical Society. All rights reserved..

News Article | November 3, 2015

Looking at pictures of Chile's Atacama Desert right now, you would never know it's one of the driest places on the planet. Normally the landscape is parched and arid. But this year it's covered in flowers—mauves, reds, yellows, whites—creating a stunning and unusual spectacle. Heavy rains prepared the ground back in March. The Atacama region saw almost an inch of rain in one day—the equivalent of 14 years of rain in 24 hours. "This year has been particularly special, because the amount of rainfall has made this perhaps the most spectacular of the past 40 or 50 years," Raul Cespedes, a desert scientist at the University of Atacama, told AFP. According to AFP, the flowers include violet-and-white Chilean bell flowers, countryside sighs (Nolana paradoxa), red lion claws (Bomarea ovallei), and yellow Rhodophiala rhodolirion. Because of the intensity of the storms, there were two flowerings: in the winter and now again in the Chilean spring. "Two flowerings a year is very unusual in the most arid desert in the world, and that's something we've been able to enjoy this spring, along with people from all over the world. There's a lot of interest in seeing it," Daniel Diaz, director of the National Tourism Service in Atacama, told AFP. Meteorologists blame El Niño for the extreme rainfall in Atacama and warn of worse to come as that weather pattern intensifies. But for now, the event is a boon for tourism and a something to marvel at: flowers where flowers don't normally grow.

Santander M.,Federal University of Rio Grande do Sul | Santander M.,University of Atacama | Rodrigues R.T.,Federal University of Rio Grande do Sul | Rubio J.,Federal University of Rio Grande do Sul
Colloids and Surfaces A: Physicochemical and Engineering Aspects | Year: 2011

This work presents results of a rapid emulsified oil (petroleum) removal from water by flocculation followed by flotation in a modified jet (Jameson) cell (MJC). The modification is such that the downcomer was sealed at the bottom (by a concentric blind-end tube) to allow floated particles to enter immediately into the frothy phase after the capture of the oily flocs by the bubbles. Also, a packed bed (crowder) was placed at the upper part of the concentric tube to stabilize the froth and facilitate the rise of the oil floc/bubble aggregates. The work was divided into two parts: a detailed laboratory study (1.3m3/h) and a pilot plant trial in an offshore platform. Parameters studied were flocculation (type and concentration of polymer), oil concentration, oil droplets size distribution and flotation cell design. Results of laboratory studies showed mean separation efficiencies of the order of 80% when used as a conventional jet cell (CJC) with feed emulsions (droplets size of about 20μm) ranged between 100 and 400mg/L petroleum concentration. The oil removal increased up to 85% in the MJC. These studies allowed optimizing the design and process parameters: chemical, physico-chemical and operating. A MJC (5m3/h) was then projected, built and installed in an offshore platform, after the oil extraction-production point. At optimal conditions, in a single flotation stage, discharges varied between 20 and 30mg/L oil concentration or 81% removal at 24.7m3/hm2 loading capacity. Because this jet cell operates with a high air hold-up, it presented a very good efficiency (capture of oil droplets by bubbles) at low residence time (high-rate separation) and showed to be simple, compact and easy to operate. It is believed that the MJC has a great potential for treating polluted oily high flow wastewaters, at high separation rate. Results and mechanisms involved are discussed in terms of interfacial phenomena and design factors. © 2011 Elsevier B.V.

Palacios J.,University of Atacama | Sanchez M.,University of Concepción
Transactions of the Institutions of Mining and Metallurgy, Section C: Mineral Processing and Extractive Metallurgy | Year: 2011

Copper production from sulphide minerals generates massive amounts of slag as final waste of the pyrometallurgical processes. Dumping the slag nearby the smelter plant has been the common practice and, currently it is produced in a proportion of 2.2 ton of slag per ton of blister copper and is granulated to facilitate the transportation and final disposal. Thus, it is relevant to improve sustainability by recycling this waste to minimise the environmental impact generated during pyrometallurgical treatment of copper sulphides concentrates. Laboratory tests were run in order to concentrate and separate metals and materials for obtaining results that could be scaled up to pilot and industrial level. The results of pyrometallurgical and hydrometallurgical experiments are presented in order to show the importance of the oxidation of the slag at high temperatures that could liberate those metals molecularly entrapped during processing sulphide concentrate in the smelter plant. Therefore, the present work shows experimental work done in Chile in order to add value to this waste by recovering contained metals and materials such as copper, molybdenum, and iron and silica, with iron and silica being more than half of the total content of the slag, which has an important effect on the volume of the stocked material. © 2011 Institute of Materials, Minerals and Mining and The AusIMM.

Rivera J.D.D.,University of Atacama
Atmospheric Research | Year: 2011

Fog water collectors (FWC) can provide water to arid zones with persistent advection and orographic fog. A key feature of any FWC is the mesh used to capture fog droplets. Two relevant mesh characteristics are its shade coefficient and the characteristics of the fibers used to weave or knit the mesh. This paper develops a simple superposition model to analyze the effect of these factors on the Aerodynamic Collection Efficiency (ACE) of FWCs. Due to the simplicity of the model it cannot be directly applied to actual FWC meshes, and serve only for guidance on the order of magnitude of the optimum shade coefficient and the corresponding ACE. The model shows that there is a maximum ACE of the order of 20-24.5% for shade coefficients between 0.5 and 0.6, for the particular mesh simulated. Aerodynamic collection efficiency can be increased by making the FWC concave and improving the aerodynamics of the mesh fibers. © 2011 Elsevier B.V.

Thomas J.C.R.,University of Atacama
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2011

This project shows the development of a new clustering algorithm, based on k-means, which faces its problems with clusters of differences variances. This new algorithm uses a line segment as prototype which captures the axis that presents the biggest variance of the cluster. The line segment adjusts iteratively its long and direction as the data are classified. To perform the classification, a border region that determines approximately the limit on the cluster is built based on geometric model, which depends on the central line segment. The data are classified later according to their proximity to the different border regions. The process is repeated until the parameters of the all border regions associated with each cluster remain constant. © 2011 Springer-Verlag.

The requirements elicitation captures relevant information to the shaping of software requirements by using several techniques. However, the effectiveness of the process depends on the context in which it occurs. This article aims to reveal the attributes of the context influencing the elicitation process. For this purpose, a systematic and non-systematic review of the scientific literature was conducted in order to determine which are these attributes. The result of this review yielded 118 attributes that were grouped into 27 generic attributes corresponding to 5 factors: the eductor, the informant, the problem domain, the solution domain and the process itself. This study helps to guide future empirical researches on requirements elicitation pointing out possible experimental factors to consider. © 2015, Universidad de Tarapaca. All rights reserved.

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