Investigaciones: Envíos recientes
Mostrando ítems 961-980 de 1465
-
Scientific reasoning skills and patterns of use of Information and Communication Technologies. The case of the students of the Universidad de Santander (Valledupar, Colombia)
(Cartagena de Indias, 2019-10-30)This research establishes the relationship that has had the development of the skills of scientific reasoning and the patterns of use of tools and resources of information and communication technology (ICT). For that, it ... -
Power quality detection and classification using wavelet and support vector machine
(Cartagena de Indias, 2019-09-24)This work presents the identification and classification of various disturbances that affect the quality of energy, seen as the quality of the voltage wave (harmonics, sag, swell and flicker). For this, the wavelet transform ... -
Toward the generation of reproducible synthetic surface data in optical metrology
(Cartagena de Indias, 2020-05-19)The implementation and generation of synthetic data for testing algorithms in optical metrology are often difficult to reproduce. In this work, we propose a framework for the generation of reproducible synthetic surface ... -
State-of-the-art green roofs: Technical performance and certifications for sustainable construction
(Cartagena de Indias, 2020-01-13)Green roof systems, a technology which was used in major ancient buildings, are currently becoming an interesting strategy to reduce the negative impact of traditional urban development caused by ground impermeabilization. ... -
SPUD: Simultaneous phase unwrapping and denoising algorithm for phase imaging
(Cartagena de Indias, 2020-05-01)Recent methods for phase unwrapping in the presence of noise include denoising algorithms to filter out noise as a preprocessing stage. However, including a denoising stage increases the overall computational complexity ... -
Power flow solution in direct current grids using the linear conjugate gradient approach
(Cartagena de Indias, 2019-09-24)The Colombian power system is being modified by the large-scale integration of renewable energy resources and energy storage systems, in conjunction with the microgrid concept that originates the possibility of alternating ... -
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 ...
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.
