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On the efficiency in electrical networks with ac and dc operation technologies: A comparative study at the distribution stage
(Cartagena de Indias, 2020-08-20)This research deals with the efficiency comparison between AC and DC distribution networks that can provide electricity to rural and urban areas from the point of view of grid energy losses and greenhouse gas emissions ... -
On the Existence of the Power Flow Solution in DC Grids With CPLs Through a Graph-Based Method
(Cartagena de Indias, 2020-08-27)This brief explores the formulation of the power flow problem in DC grids with a classical incidence matrix through a graph-based formulation. This corresponds to a compact representation of the conventional backward/forward ... -
On the fractal properties of cosmic rays and Sun dynamics cross-correlations
(Cartagena de Indias, 2022)We investigate the cosmic rays and ten physical parameters of heliosphere behavior considering the scaling features of their temporal evolution. Our analysis start with the cosmic rays measurements by a neutron monitor ... -
On the illumination compensation of retinal images by means of the bidimensional empirical mode decomposition
(SPIE, 2015)Retinal images are used for diagnostic purposes by ophthalmologists. However, despite controlled conditions in acquisition retinal images often suffer from non-uniform illumination which hinder their clinical use. In this ... -
On the mathematical modeling for optimal selecting of calibers of conductors in DC radial distribution networks: An MINLP approach
(Cartagena de Indias, 2021-01-29)This paper addresses the problem of optimal conductor selection in direct current (DC) distribution networks with radial topology. A nonlinear mixed-integer programming model (MINLP) is developed through a branch-to-node ... -
On the Matricial Formulation of Iterative Sweep Power Flow for Radial and Meshed Distribution Networks with Guarantee of Convergence
(Cartagena de Indias, 2020-08-21)This paper presents a general formulation of the classical iterative-sweep power flow, which is widely known as the backward–forward method. This formulation is performed by a branch-to-node incidence matrix with the main ... -
On the nonlinear control of a single-phase current source converter for sinusoidal voltage generation
(Cartagena de Indias, 2020)Colombian power system is being transformed for the large-scale integration of renewable energy resources and energy storage systems; all of these are integrated by power electronic converters controlled by voltage and ... -
On the numerical analysis based on successive approximations for power flow problems in AC distribution systems
(Cartagena de Indias, 2020-10)This paper proposes a new power flow formulation for alternating-current distribution networks for radial and mesh topologies. This formulation corresponds to a successive approximation based on a modification of the ... -
On the Optimal Reconfiguration of Radial AC Distribution Networks Using an MINLP Formulation: A GAMS-Based Approach
(Cartagena de Indias, 2022)This paper addresses the problem of the optimal reconfiguration of medium-voltage distribution networks by proposing a mixedinteger nonlinear programming (MINLP) model. The objective function of this optimization model is ... -
On the Optimal Selection and Integration of Batteries in DC Grids through a Mixed-Integer Quadratic Convex Formulation
(Cartagena de Indias, 2021-09-24)This paper deals with the problem of the optimal selection and location of batteries in DC distribution grids by proposing a new mixed-integer convex model. The exact mixed-integer nonlinear model is transformed into a ... -
On the use of the p-q theory for harmonic currents cancellation with shunt active filter
(VSB-Technical University of Ostrava, 2019)Discussion and mathematical proof on necessary and sufficient conditions for the application of the p-q theory for compensating the harmonic currents consumed by non-linear load using a shunt active filter are presented. ... -
Ondas - Cardique 10 años
(Cartagena de IndiasCampus Tecnológico, 2018-11-28)El programa Ondas lleva 16 años generando fascinación por la ciencia y la investigación de tal manera que se ha constituido, hoy por hoy en la principal estrategia de Colciencias para el desarrollo de una cultura ciudadana ... -
One-minute integrated rainfall rate statistics from a rain gauge network in Colombia: Accuracy of prediction methods
(Cartagena de Indias, 2020-08-25)Reliable rainfall rate complementary cumulative distributions are critical for the design of microwave communications systems operating above around 8 GHz. This Letter presents the results of the analysis of more than 5 ... -
Operación continua en las redes (Load Balancing: concepto, gestión y monitoreo)
(Universidad Tecnológica de Bolívar, 2008)El presente documento es el resultado de una amplia investigación a cerca de la operación continua de redes, principalmente utilizando el balanceo de cargas. Además de otro tipo de herramientas y aspectos de igual ... -
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Operating cost reduction in distribution networks based on the optimal phase-swapping including the costs of the working groups and energy losses
(Cartagena de Indias, 2021-07-27)The problem of optimal phase-balancing in three-phase asymmetric distribution networks is addressed in this research from the point of view of combinatorial optimization using a master– slave optimization approach. The ... -
Oportunidad de mercado de exportaciones de confecciones infantiles desde Colombia hacia Canadá
(Universidad Tecnológica de Bolívar, 2012)En este artículo trataremos acerca de las oportunidades que tiene la industria de confecciones infantiles colombianas en el mercado canadiense. Para abordar este tema primero explicaremos la negociación del acuerdo del ... -
Oportunidades de desarrollo para la Cartagena rural
(2014)Históricamente, Cartagena de Indias ha sido escenario de importantes aconte-cimientos en el ámbito nacional. Desde la misma época de la conquista y a lo lar-go de toda la colonia la ciudad fue centro de atención por su ... -
Oportunidades de exportación del Valle del Cauca en el acuerdo comercial Colombia-Canadá : el caso del sector azucarero
(2011)El tratado de Libre Comercio de Canadá y Colombia es un avance en el proceso de integración de sus economías, que brinda nuevas oportunidades comerciales. Esta investigación busca arrojar luces sobre la competitividad ... -
Opportunistic renegotiation of infraestructure concessions as rent seeking : the effect of legal systems
(2010)This paper examines the problem of renegotiation of infrastructure conces-sions in Latin America using a model of litigation with an application to in-centive contracts. Opportunistic renegotiation is here defined as a ...
Universidad Tecnológica de Bolívar - 2017 Institución de Educación Superior sujeta a inspección y vigilancia por el Ministerio de Educación Nacional. Resolución No 961 del 26 de octubre de 1970 a través de la cual la Gobernación de Bolívar otorga la Personería Jurídica a la Universidad Tecnológica de Bolívar.