Productos de investigación: Envíos recientes
Mostrando ítems 901-920 de 1398
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Perspectivas de la política de contabilidad ambiental, sistemas de información administrativa y financiera
(Cartagena de Indias, 2020-06-23)El objetivo del artículo es analizar desde las políticas públicas el proceso de contabilidad medioambiental, como sistema de gestión de información administrativa y financiera. Metodológicamente, se basó en el paradigma ... -
Selection of hydrological probability distributions for extreme rainfall events in the regions of Colombia
(Cartagena de Indias, 2020-05-14)Frequency analysis of extreme events is used to estimate the maximum rainfall associated with different return periods and is used in planning hydraulic structures. When carrying out this type of analysis in engineering ... -
Análisis de Eficiencia de Sector Inmobiliario
(Cartagena de Indias, 2020-03-16)This research an analysis of the efficiency of the real estate sector of the city of Cartagena - Colombia is developed. For the 46 companies registered as real estate agencies in the city, the techniques of principal ... -
Plastics and microplastics, effects on marine coastal areas: a review
(Cartagena de Indias, 2020-08-11)Plastics have become strong environmental stressors of coastal marine ecosystems. Their introduction into the marine ecosystem is subjected to different mechanisms, including the inadequate disposal of solid waste and ... -
Optimal Placement and Sizing of Wind Generators in AC Grids Considering Reactive Power Capability and Wind Speed Curves
(Cartagena de Indias, 2020-04-08)This paper presents an optimization model for the optimal placement and sizing of wind turbines, considering their reactive power capacity, wind speed, and demand curves. The optimization model is nonlinear and is focused ... -
Quasi-static flow model for predicting the extreme values of air pocket pressure in draining and filling operations in single water installations
(Cartagena de Indias, 2020)Inertial models have been used by researchers to simulate the draining and filling processes in water pipelines, based on the evolution of the main hydraulic and thermodynamic variables. These models use complex differential ... -
Quality Improvement in Ammonium Nitrate Production Using Six Sigma Methodology
(Cartagena de Indias, 2020)Six sigma has been used in different industries to reach operational excellence. However, in the chemical industry, the application of this methodology is limited. This research presents an implementation of the six sigma ... -
Optimal Location-Reallocation of Battery Energy Storage Systems in DC Microgrids
(Cartagena de Indias, 2020-05-05)This paper deals with the problem of optimal location and reallocation of battery energy storage systems (BESS) in direct current (dc) microgrids with constant power loads. The optimization model that represents this problem ... -
Analysis and classification of lung tissue in ultrasound images for pneumonia detection
(Cartagena de Indias, 2020-01-03)Pneumonia is an infection of the lungs caused by virus, bacteria or fungi. It affects mainly children under five and can be life-threatening. Diagnosis of pneumonia is usually performed using imaging techniques such as ... -
A low-cost multi-modal medical imaging system with fringe projection profilometry and 3D freehand ultrasound
(Cartagena de Indias, 2020-01-03)The growing need to perform surgical procedures, monitoring, and intervention of greater precision have led to the development of multimodal medical imaging systems. Multimodal images are a strategy to overcome the limitations ... -
A Generic Materials and Operations Planning Approach for Inventory Turnover Optimization in the Chemical Industry
(Cartagena de Indias, 2020-05-22)Chemical industries usually involve continuous and large-scale production processes that require demanding inventory control systems. This paper aims to show the results of the implementation of a mixed-integer programming ... -
Optimal Charging Scheduling of Electric Vehicles based on Principal Component Analysis and Convex Optimization
(Cartagena de Indias, 2020-07-30)The widespread presence of plug-in Electric Vehicles (PEVs) in distribution power grids brings significant concerns regarding their energy demand and peak power requirements. In order to reduce the PEV load impact on power ... -
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 ... -
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 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 ... -
Numerical methods for power flow analysis in DC networks: State of the art, methods and challenges
(Cartagena de Indias, 2020-12)This study addresses the power-flow-analysis problem for direct-current (DC) grids from a numerical perspective. Classical and emerging algorithms for power flow solutions in DC networks such as Gauss--Seidel, successive ... -
Mathematical modeling of a system composed of parabolic trough solar collectors integrated with a hydraulic energy storage system
(Cartagena de Indias, 2020)In this work we propose to model a 7.5 kWe power generation system, implementing a Parabolic Trough Collector system, coupled to an Organic Rankine Cycle (PTC/ORC) and a bladder-type hydraulic accumulator system. The purpose ... -
Hybrid calibration procedure for fringe projection profilometry based on stereo vision and polynomial fitting
(Cartagena de IndiasIngeniería Mecatrónica, 2020-03-19)The key to accurate 3D shape measurement in fringe projection profilometry (FPP) is the proper calibration of the measurement system. Current calibration techniques rely on phase-coordinate mapping (PCM) or back-projection ... -
Fracture Dynamic Analysis of Cracked Reissner Plates Using the Boundary Element Method
(Cartagena de IndiasIngeniería Mecánica, 2020-05-15)This work presents a Dual Boundary Element Method/Dual Reciprocity Boundary Element Method formulation for the dynamic analysis of fractured shear deformable plates. Equations for the Dual Boundary Element Method, including ... -
Dynamic active and reactive power compensation in distribution networks with batteries: A day-ahead economic dispatch approach
(Cartagena de IndiasCampus TecnológicoIngeniería Eléctrica, 2020-06-08)This paper focuses on the problems of optimal operation of battery energy storage systems (BESSs) in distributed networks from a nonlinear programming (NLP) point of view. This proposal contains the active and reactive ...
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.