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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.

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. Source

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

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. Source

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

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. Source

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

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 Source

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

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. Source

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