Universidad del Norte, Colombia

About: Universidad del Norte, Colombia is a education organization based out in Barranquilla, Colombia. It is known for research contribution in the topics: Population & Context (language use). The organization has 3562 authors who have published 4355 publications receiving 37861 citations. The organization is also known as: University of the North, Colombia & Uninorte.

Investigating the Collapse of the Puerto Colombia Pier (Colombian Caribbean Coast) in March 2009: Methodology for the Reconstruction of Extreme Events and the Evaluation of their Impact on the Coastal Infrastructure

Abstract: Ortiz, J.C.; Salcedo, B., and Otero, L.J., 2014. Investigating the collapse of the Puerto Colombia pier (Colombian Caribbean Coast) in March 2009: methodology for the reconstruction of extreme events and the evaluation of their impact on the coastal infrastructure. On March 7, 2009, a 200-m section of the Puerto Colombia pier collapsed when a cold front passed through the Atlantico Department of Colombia on the Caribbean coast. Herein, the most important meteo-marine event of the last 10 years in the Colombian Caribbean area was reconstructed using SWAN software and the WAVEWATCH III global wave model, which uses wind fields as input. The modeling method involved a nested grid approach for wave generation and propagation in a particular sector of the central Caribbean coast of Colombia. To validate the numerical model, the time series for the event generated using modeling data was compared with the recorded wave data from two buoys: buoy 42058, which is located in the Caribbean Sea and operated ...

Culture and growth of Lessonia trabeculata (Phaeophyta, Laminariales) juvenile sporophytes in La Herradura de Guayacan Bay, northern Chile

Abstract: Lessonia trabeculata is one of the major kelps found along the northern coast of Chile. In addition to its ecological and economic importance, L. trabeculata may be severely affected by environmental disturbances such as El Nino, which during 1982–1983 cleared wide areas along the coast of Peru and Chile. The main goal of this work was to mass culture L. trabeculata and to observe the growth of sporophytes obtained in the laboratory and cultured in the sea. Juvenile sporophytes obtained in the laboratory were attached between 1 and 6 m in depth. The linear growth rate, as blade elongation, was recorded weekly for seven months. No significant differences (p < 0.05) were found in sporophyte blade linear growth at different depths. The best elongation growth rate was 7.5 ± 1.6 mm d-1 at 3 m during March. This preliminary work suggests that L. trabeculata follows an annual growth cycle similar to that of other Laminariales with a high rate of blade elongation during the summer and decreasing towards autumn. This species can be considered a potential candidate for aquaculture to increase the availability of raw material and aid in repopulation of overexploited areas.

Looking for the best modes helps solving the MRCPSP/max

Abstract: The multi-mode resource-constrained project scheduling problem with minimum and maximum time lags MRCPSP/max is a very general project scheduling problem with multiple execution modes per activity, renewable and non-renewable resources and minimum and maximum time lags between activities. In this paper, we describe SA-EVA, an algorithm for the problem. SA-EVA first searches for the best mode for each activity, without considering renewable resources. In this phase a simulated annealing is applied. Once a mode vector has been chosen, the problem reduces to the RCPSP/max, which SA-EVA solves with EVA, an algorithm designed in Ballestin et al. [2009. An evolutionary algorithm for the resource-constrained project scheduling problem with minimum and maximum time-lags. Journal of Scheduling, 14 (4), online]. Computational results show that SA-EVA outperforms the state-of-the-art algorithms in medium and large instances.

Archaeogenomic Distinctiveness of the Isthmo-Colombian Area

Abstract: The recently enriched genomic history of Indigenous groups in the Americas is still meagre concerning continental Central America. Here, we report ten pre-Hispanic (plus two early colonial) genomes and 84 genome-wide profiles from seven groups presently living in Panama. Our analyses reveal that pre-Hispanic demographic changes and isolation events contributed to create the extensive genetic structure currently seen in the area, which is also characterized by a distinctive Isthmo-Colombian Indigenous component. This component drives these populations on a specific variability axis and derives from the local admixture of different ancestries of northern North American origin(s). Two of these ancestries were differentially associated to Pleistocene Indigenous groups that also moved into South America leaving heterogenous footprints. An additional Pleistocene ancestry was brought by UPopI, a still unsampled population that remained restricted to the Isthmian area, expanded locally during the early Holocene, and left genomic traces up to the present.

Los cibermedios en América Latina y la Web 2.0

Abstract: Las tecnologias 2.0 estan transformando los espacios destinados a la interaccion y la participacion en los cibermedios. El objetivo de esta investigacion es determinar el grado de adopcion del ciberperiodismo y de las web 2.0 en America Latina. Para ello se analizaron 19 medios digitales de la region, a partir de los resultados obtenidos de dos olas de recopilacion de datos llevados a cabo durante 2010, en el marco del proyecto «Los cibermedios en Colombia y America Latina», realizado desde la Universidad del Norte (Colombia), con el apoyo de la Universidad de los Andes (Venezuela). El estudio parte del modelo de analisis propuesto por Rodriguez-Martinez, Codina & Pedraza- Jimenez (2010). Los resultados apuntan que los medios latinoamericanos estan apostando por la incorporacion de herramientas de la web 2.0, pero que sin embargo existen notables diferencias de calidad entre los medios mejor calificados por el «ranking» del estudio (Colombia y Mexico) y los peor valorados (Chile y Bolivia). Este «ranking» permitio, por ejemplo, identificar claramente como los medios digitales analizados en America Latina, aun siguen perdiendo importantes puntos en lo que se refiere a los aspectos relacionados con los indicadores generales, como por ejemplo los errores de accesibilidad, los niveles de popularidad y visibilidad de sus portales; y los indicadores especificos internos, en especial en lo que respecta a los recursos puestos a disposicion para la profundizacion de la informacion y las herramientas de interaccion.