Sergio Arboleda University is a Roman Catholic university located in Bogotá, Colombia, with a sectional located in Santa Marta, Colombia. Pedro Carmona former coupster against the government of Hugo Chávez in Venezuela holds a post as university professor. Wikipedia.
Lopez-Barrera E.A.,Sergio Arboleda University |
Barragan-Gonzalez R.G.,Santo Tomas University of Colombia
Journal of Toxicology and Environmental Health - Part A: Current Issues | Year: 2016
The risk imposed upon society by consumption of foods contaminated with metals and metalloids is an environmental problem attributed to the increasing number of mining extraction activities currently underway in Colombia. The aim of the current study was to determine concentrations of mercury (Hg), lead (Pb), cadmium (Cd), and a metalloid arsenic (As) found in the species of most consumed fish species by citizens of Bogota D.C. (Colombia), and the consequent potential risk to human health was also calculated. Muscle samples of 8 fish species were obtained from 203 individuals collected through 2014. The highest metal concentrations detected were as follows: Pb in Oncorhynchus sp. (0.0595 mg/kg), Cd and Hg in Pimelodus sp. (0.0072 and 0.0579 mg/kg, respectively), and As in Scomberomorus sp (0.0471 mg/kg). Further, the levels of metal accumulation from consumption of fish were calculated utilizing the metal pollution index (MPI), with elevated values noted in Pseudoplatystoma sp (0.06 mg/kg), followed by Scomberomorus sp. and Centropomus sp. (0.05 and 0.04 mg/kg, respectively). The multiple species exposure index (Em.j) denotes the level of exposure associated with consumption of various contaminated fish species, and this level occurred in decreasing order as follows: As > Pb > Cd > Hg. The multiple chemical exposure index (Ej.m), which accounts for exposure to multiple metals, identified Prochilodus sp. as the species displaying the highest level of exposure per consumption (8 × 10−6 mg/kg-d). The target hazard quotient (THQ) for human health indicated high levels for Hg and Cd in Prochilodus sp. (0.026 and 0.005, respectively), Pb in Oncorhynchus sp (0.025), and As in Pseudoplatistoma sp. and Centropomus sp. (0.023). Data emphasize the need for adequate nationwide public policies that promote assessment of exposure levels and potential adverse health risks associated with dietary consumption of different fish species in Colombia. © 2016 Taylor & Francis
Ibarra-Vega D.W.,Sergio Arboleda University
DYNA (Colombia) | Year: 2016
This paper presents a model and simulations, which was built with a System Dynamics methodology applied to waste management in the bioethanol supply chain in Colombia. The stages of the supply chain used were cane planting, production and the distribution process. The residues taken into account were bagasse and vinasse. Moreover, four simulation scenarios were performed in which the values of variables modified management strategies. The installed bioethanol production capacity was increased to observe the evolution of increased waste generation evaluated. The initial conditions for the simulation were modified to represent a production of about 2,500,000 liters / day. This leads to an increased generation of vinasse of over 400 million liters on average in a month and around more than 1 million tones of bagasse. The results are used to estimate the impact of management strategies on the amount of waste generated in the production of bioethanol. © The author; licensee Universidad Nacional de Colombia.
Gomez C.G.,Sergio Arboleda University
Proceedings of the International Astronautical Congress, IAC | Year: 2014
The cooperation on space exploration is an essential element to achieve significant progress in developing countries especially given the needs and costs of exploration. In the Latin American region, the vast majority of countries have little experience in space and projects Planetary Exploration Robotic and Human Spaceflight seem distant in time So far, the cooperation among these countries has been nonexistent or very recent, although the region has common needs and common problematic, cooperation has been essentially a cooperation between countries in the region with developed countries or space faring nations. Although this cooperation has allowed the development of national activities in countries like Brazil, Argentina and Venezuela, the need to respond to the aspirations of nations it's essential a regional cooperation. It has had several major attempts to establish regional cooperation. This process began in 1991 with the Space Conference of the Americas. In the 6 meetings held so far, much progress has been made and many space agencies were created. However, no specific projects have been created and the future of this mechanism is uncertain.Another attempt resulted in a spatial cooperation UNASUR meeting in which it was determined the creation of a regional agency, but neither have seen concrete results. Finally, under the impetus of the International academy of astronautics (IAA), international experts, academia and the space agencies of the region, at a preparatory workshop for the meeting of Heads of Space Agencies organized in Washington, the head of the regional agencies had declared the importance of establishing a regional cooperation mechanism. From there work done turned the idea of creating an alliance of space agencies, as a flexible mechanism for creating common projects and as a forum for reflection on possible projects and contributions of the region in terms of space exploration. It also seeks to establish a university and regional industry cooperation. This paper aims to show the results of this preparatory workshop and establish the mechanisms and challenges of cooperation in Latin America in the field of space exploration. Copyright ©2014 by the International Astronautical Federation. All rights reserved.
Blazquez-Sanz D.,Sergio Arboleda University |
Pantazi C.,Polytechnic University of Catalonia
Nonlinearity | Year: 2012
In this work, we unfold some differential algebraic aspects of Darboux first integrals of polynomial vector fields. An interesting improvement is that our approach can be applied both to autonomous and non-autonomous vector fields. We give a sufficient and necessary condition for the existence of a Darboux first integral of a specific form for a polynomial vector field with some known algebraic invariant hypersurfaces. For the autonomous case, the classical result of Darboux is obtained as a corollary. For the non-autonomous case our characterization improves a known criterium. © 2012 IOP Publishing Ltd & London Mathematical Society.
Silva A.J.V.,Sergio Arboleda University
Computing, Control, Information and Education Engineering - Proceedings of the 2015 2nd International Conference on Computer, Intelligent and Education Technology, CICET 2015 | Year: 2015
In times of recession, there are fewer consumers are willing to pay for items that do not add value to the final product, such as high inventories, or unnecessary costs. This article aims to propose strategies for the reduction of inventories in the supply chain of multinational companies finished product. For this one of the largest producers of consumer goods in the world with presence in Europe, the Middle East and Africa was studied. Through analysis and business reporting interviews diagnosed and identifies high inventory levels and inventory policies inadequate as key factors that improve supply chain study sample. Also formulating and implementing redistribution processes and forecasting to combat Productive Inventory No impairments, as well as designing processes to be executed to deepen them. The end result is achieved reduce inventory by more than half of Currency Units (UM) million and, in addition to identifying future risks that could jeopardize service levels of the company. © 2015 Taylor & Francis Group, London.