University of Los Andes

About: University of Los Andes is a education organization based out in Bogotá, Colombia. It is known for research contribution in the topics: Population & Large Hadron Collider. The organization has 17616 authors who have published 25555 publications receiving 413463 citations.

Application of multicriteria decision methods for electric supply planning in rural and remote areas

Abstract: Multi-criteria decision-making methods have emerged as a very useful tool to find solutions under different criteria or conflicting points of view, also in energy planning. However, social and environmental criteria have not been fully integrated in rural electrification projects design and play often an opposing role to technical and economic criteria. We propose the combined application of two multi-criteria decision-making methods, namely, the Analytical Hierarchy Process (AHP) and Compromise Ranking method (VIKOR), to facilitate the selection of the best solution for electrical supply of remote rural locations, involving technical, economic, environmental and social criteria. A group of experts were consulted for weighting the preferences of the criteria, sub-criteria and category of deciders. Thirteen discrete alternatives were proposed; the first six were associated with optimal multi-objective solutions pertaining to dispersed decentralized generation and another six multi-objective options to compact decentralized generation (CDG), and last, extension of the public electric grid was considered. The results reveal that the combination of multi-criteria methods facilitates decision-making in a manner that is robust, comprehensive, transparent and coherent to sustainable development requirements. CDG resulted in the best model of electrical supply.

Determining the azimuthal properties of coronal mass ejections from multi-spacecraft remote-sensing observations with stereo secchi

Abstract: We discuss how simultaneous observations by multiple heliospheric imagers can provide some important information about the azimuthal properties of Coronal Mass Ejections (CMEs) in the heliosphere We propose two simple models of CME geometry that can be used to derive information about the azimuthal deflection and the azimuthal expansion of CMEs from SECCHI/HI observations We apply these two models to four CMEs well-observed by both STEREO spacecraft during the year 2008 We find that in three cases, the joint STEREO-A and B observations are consistent with CMEs moving radially outward In some cases, we are able to derive the azimuthal cross-section of the CME fronts, and we are able to measure the deviation from self-similar evolution The results from this analysis show the importance of having multiple satellites dedicated to space weather forecasting, for example in orbits at the Lagrangian L4 and L5 points

Exactly solvable model of interacting particles in a quantum dot.

Abstract: A simple, yet physically reasonable, model is presented which describes an arbitrary number of interacting particles in a quantum dot. Exact analytic expressions are obtained for the energy spectrum as a function of particle number and magnetic field

Reconstruction and identification of τ lepton decays to hadrons and ντ at CMS

Abstract: This paper describes the algorithms used by the CMS experiment to reconstruct and identify tau to hadrons + tau neutrino decays during Run 1 of the LHC. The performance of the algorithms is studied in proton-proton collisions recorded at a centre-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 19.7 inverse femtobarns. The algorithms achieve an identification efficiency of 50-60%, with misidentification rates for quark and gluon jets, electrons, and muons between per mille and per cent levels.