Maicao, Colombia
Maicao, Colombia

The University of La Guajira , also known as Uniguajira, is a public, departmental, coeducational, university based primarily in the city of Riohacha, La Guajira, Colombia. The university was established by ordinance No. 011 and 012 of 1976, by the Departmental Assembly, and began its labor in February 1977. Its main campus, known as the University Citadel , is located in the outskirts of the city, and it hosts the faculties of Basic science, Economic and Administrative science, Education science, Engineering, and Social and Humanity science. The university also counts with several satellite campuses across the department in the cities of Albania, Fonseca, Maicao, Manaure, and Villanueva, and one campus in the department of Córdoba in the city of Montería. The university offers education at technical, undergraduate and postgraduate levels. Their school mascot is a jellyfish because it symbolizes power and simplicity. Wikipedia.

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Jimenez-Ferbans L.,Institute Ecologia | Jimenez-Ferbans L.,University of La Guajira | Reyes-Castillo P.,University of La Guajira
Invertebrate Systematics | Year: 2014

Ameripassalus, gen. nov., is described as the first genus of Passalini with a distribution restricted to Mesoamerica. The species include A. guatemalensis (Kaup, 1869), comb. nov. from Passalus Fabricius, A. difficilis, sp. nov. and A. tamaulipensis, sp. nov. from Mexico, and A. jacki, sp. nov. and A. nigritus, sp. nov. from Guatemala. A matrix of 46 morphological characters, including the species from Ameripassalus, gen. nov. and 13 species of the genera Paxillus MacLeay, Ptichopus Kaup, Heliscus Zang, Veturius Kaup, Spasalus Kaup, Passipassalus Fonseca & Reyes-Castillo, Passalus Fabricius and Leptaulax Kaup were analysed. Only a single most parsimonious tree was found; in this Ameripassalus is retrieved as a monophyletic group. Ameripassalus difficilis, sp. nov. is shown as the sister group of the rest of the species in the genus. The species with the southernmost distribution (A. guatemalensis (A. nigritus, sp. nov.+A. jacki, sp. nov.)) form a nested clade within the species with the northernmost distribution. Keys to identify adults of the genera of Passalini and to the species of Ameripassalus are provided. © CSIRO 2014.

Fidalgo A.,Technical University of Madrid | Sein-Echaluce M.L.,University of Zaragoza | Leris D.,University of Zaragoza | Castaneda O.,University of La Guajira
Journal of Universal Computer Science | Year: 2013

The education project presented in this paper endeavors to study the feasibility of incorporating adaptive systems into LMS systems, by using them both in training & learning process and at work. This case study is aimed at employability and job post improvement. For this purpose, we have created a process that is flexible both to the student pattern (and to the job pattern. The developed process is adaptable both to the student (via the incorporation of an adaptable system with an LMS system) and to the job model (via an adaptable system to the knowledge management). The evaluation was qualitative and measured the process (feasibility to apply adaptive systems) and the efficiency of the method (applicability and employability). The functionality of the specific developed tools allowed us to grade the degree of adaptability in the training process, to dynamically vary the training plan from the student's actions and to identify the resources that best met the job needs. © J.UCS.

Wastewater Treatment Plant Works has been facing hycdraulic problem refers to back-mixing, short-circuiting and wind effect, thus reducing of the Mean Hydraulic Retention Time, MHRT. Tracer studies for full-scale WSP and UASB is complex and expensive. For that, a calibrated physical model. PM is better alternative to determine MHRT even though similarities between prototype and physical model are achieved. The aim of this study is to determine the MHRT through out two physical models by using Rhodamine WT dye and Lidsey UK)and (UASB, Colombia), respectively. Hydraulic pathways usíng tracer's lechniques in still and artificial solution water was analysed. The resulls found an agreement of the layout match in terms of MHRT (0.77d against to 0.89d) for WSPs and (4.8h against to 6.17) for an UASB betw en P.M and prototypes over 96% of confidence level. Dispersed-mix d flow was achieved.

Giraldo L.,National University of Colombia | Bastidas-Barranco M.,University of La Guajira | Moreno-Pirajan J.C.,University of Los Andes, Colombia
Oriental Journal of Chemistry | Year: 2014

A series of monoliths are prepared from orange peels and chemically activated with H3PO4, KOH, ZnCl2, and water vapor without a binder. The monoliths were characterized by N2 adsorption-desorption isotherms at 77 K, Boehm titrations and XPS. Thereafter, monoliths were tested for their ability to establish NOx retention. The results show that the retention capacities of NOx were a function of the textural properties and chemistries. The carbons synthesized with ZnCl2 and KOH retained similar amounts of NOx. © 2014, Oriental Scientific Publishing Company. All rights reserved.

Giraldo L.,National University of Colombia | Bastidas-Barranco M.J.,University of La Guajira | Moreno-Pirajan J.C.,University of Los Andes, Colombia
Adsorption | Year: 2016

This work describes adsorption and wetting characterisation of hydrophobic ordered mesoporous silicas (OMSs) with the SBA-15 and SBA-16 type. A synthetic approach to prepare hydrophobic SBA-15 and SBA-16 silicas was explored grafting with covalently-attached monolayers (CAMs) of CnH2n+1Si(CH3)2N(CH3)2, labelled in this research as SBA-15H and SBA-16H, respectively. The materials prepared were characterised by nitrogen adsorption and FTIR analysis. The surface properties of the materials were assessed by BET C constants. For hydroxylated bare SBA-15 silica and SBA-16, C constants were ≈100–150 and 70–90 respectively, indicating high-energy, polar surfaces of Si–OH groups. The C constants of SBA-15H and SBA-16H grafted with CAMs of alkyldimethylsilanes were in the range of ≈15–25 and ≈35–50, demonstrating non-polar, low-energy organic surfaces of closely packed alkyl groups. The hydrophobic character in this study was evidenced by studying the adsorption of alcohols of chain lineal (C1–C5), where the modified silicas showed that the adsorption capacity of less polar alcohols increased, as in the case of pentanol, butanol and propanol. Immersion calorimetry proved to be a useful and versatile technique for analysing the structural changes of silicas. © 2016 Springer Science+Business Media New York

Giraldo L.,National University of Colombia | Bastidas-Barranco M.,University of La Guajira | Moreno-Pirajan J.C.,University of Los Andes, Colombia
Colloids and Surfaces A: Physicochemical and Engineering Aspects | Year: 2016

Mesoporous solids SBA-15, SBA-16, MCM-41 and MCM-48 were synthesised using standard procedures. The products were characterised by powder X-ray diffraction (XRD) and diffuse reflectance Fourier-transform infrared (DRIFT). The adsorption isotherms of nitrogen were measured at -196 °C. Adsorption isotherms of different nonlinear alcohols were also measured at different temperatures and were adjusted to the hybrid Dubinin-Astakov (DA) model for inhomogeneous surfaces. The results obtained show that this model is valid for the polar molecules investigated.Measurement of adsorption microcalorimetry using different non-linear alcohols on mesoporous silicas was carried out. The results of differential adsorption enthalpies with these alcohols are associated with the heterogeneity surface of silicas prepared and their structure porosity.This work shows that the adsorption microcalorimetry is a promising technique to assess the energy characteristics of mesoporous solids. © 2015 Elsevier B.V..

Arregoces S.N.,University of La Guajira | Molina R.T.,Universidad del Norte, Colombia
Revista Panamericana de Salud Publica/Pan American Journal of Public Health | Year: 2015

Objective. Identify the inequalities and sociodemographic characteristics that negatively affect maternal mortality in the department of La Guajira, Colombia. Methods. A descriptive study was conducted in which cases of maternal deaths in the department of La Guajira between 2010 and 2012 were analyzed, based on data from secondary sources. The difference in rates, rate ratio, population attributable risk percent, and Gini and concentration coefficients were calculated. Results. 54 maternal deaths were recorded, 61.1% of which were indigenous and 16.7% Afro-Colombians; the majority did not have any schooling (33.3%) or only primary schooling (29.6%). Inequalities in the difference of rates, rate ratio, and population attributable risk percent were calculated for La Guajira and other departments in the Caribbean region and in Colombia; however, the differences were not reflected in the Gini and concentration coefficients. Conclusions. Maternal mortality was significantly higher in indigenous women than in non-indigenous women. Sexual and reproductive health programs should be strengthened and maternal health policies improved through a multicultural approach to eliminate or reduce inequalities related to maternal mortality in this population.

Granados-Martinez C.,University of La Guajira | Zuniga-Cespedes B.,Southern Illinois University Carbondale | Acuna-Vargas J.,University of La Guajira
Journal of Limnology | Year: 2016

Aquatic insects are considered a key component for stream food webs because of their contribution to the flow of energy from basal resources to the top predators. For this reason, the study of trophic guilds on aquatic insects is necessary to understand the transformation of energy and matter in stream ecosystems. The study of trophic guilds on aquatic insects has been widely documented in temperate streams. In contrast, little is known about feeding habits and trophic guilds in Neotropical streams. However, several lines of evidence indicate that aquatic insects in the Neotropical region are generally omnivores and that the Fine Particulate Organic Matter (FPOM) is the main food item. To test this hypothesis, we analyzed the diets and the trophic guilds of aquatic insects in an unexplored region of northern Colombia (Molino River, La Guajira). Aquatic insects were sampled using a Surber net, covering the different kind of substrates over a 100 m reach. Samples were sorted and identified to the lowest taxonomic level possible. We analyzed 250 guts of aquatic insects belonging to six orders, nine families, and 10 genera (Leptonema, Chimarra, Anacroneuria, Nectopsyche, Tabanus, Simulium, Pseudodisersus, Corydalus, Camelobaetidius, and Baetodes). We found that FPOM, algae, and animal tissue were the most important food items in the gut content of the aquatic insects at the Molino River. Our results suggest that aquatic insects in the Molino River are generally detritivores, highlighting the importance of the benthic organic matter in Neotropical streams. We reported -for the first time- the trophic guilds of the genera Nectopsyche and Pseudodisersus, which were categorized as herbivorous. Our results suggest that aquatic insects in the Molino River exploit a variety of food resources and emphasize the importance of the study of feeding habits on aquatic insects in unexplored Neotropical streams. © 2016, Page Press Publications. All rights reserved.

Choles Quintero P.E.,University of La Guajira | Aaron Gonzalvez M.A.,University of La Guajira
CISCI 2012 - Undecima Conferencia Iberoamericana en Sistemas, Cibernetica e Informatica, Noveno Simposium Iberoamericano en Educacion, Cibernetica e Informatica, SIECI 2012 - Memorias | Year: 2012

The possibilities are to understand educational realities from penetrating them through research projects in context, allowing a clear view on what actually happens. In fact, we believe that not only is clear, is really valid. This document presents the look of a research group in the line of Technology and Education, on how communities develop their educational practice, as there is communication technologies and supported in the differential use of them from their conception of the same.

Jimenez C.,University of La Guajira | Torres C.,Popular University of Cesar | Mattos L.,Popular University of Cesar
Journal of Physics: Conference Series | Year: 2011

A new method for image encryption is introduced on the basis of two-dimensional (2-D) generalization of 1-D fractional Hartley transform that has been redefined recently in search of its inverse transform We encrypt the image by two fractional orders and random phase codes. It has an advantage over Hartley transform, for its fractional orders can also be used as addictional keys, and that, of course, strengthens image security. Only when all of these keys are correct, can the image be well decrypted. Computer simulations are also perfomed to confirm the possibilty of proposed method.

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