Browsing Productos de investigación by Title
Now showing items 833-852 of 984
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SCES Integration in Power Grids: A PBC Approach under abc, αβ0 and dq0 Reference Frames
(Institute of Electrical and Electronics Engineers Inc., 2018)This paper presents an integration of three-phase supercapacitor energy storage (SCES) in power grids via passivity-based control (PBC) theory under different reference frames. The SCES systems have the possibility to ... -
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 ... -
Seasonality effect analysis and recognition of charging behaviors of electric vehicles: A data science approach
(Cartagena de Indias, 2020-09-20)Electric vehicles (EVs) presence in the power grid can bring about pivotal concerns regarding their energy requirements. EVs charging behaviors can be affected by several aspects including socio-economics, psychological, ... -
Second-order cone approximation for voltage stability analysis in direct-current networks
(Cartagena de Indias, 2020-09-24)In this study, the voltage stability margin for direct current (DC) networks in the presence of constant power loads is analyzed using a proposed convex mathematical reformulation. This convex model is developed by employing ... -
Selection of a Stopping Criterion for Anisotropic Diffusion Filtering in Ultrasound Images
(Institute of Electrical and Electronics Engineers Inc., 2019)Ultrasound imaging is a safe and cost-effective diagnostic tool, but the quality of the images is affected by speckle noise and artifacts. Anisotropic diffusion filters can be used to reduce noise and preserve the edges ... -
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 ... -
Semiclassical self consistent treatment of the emergence of seeds of cosmic structure. the second order construction
(Institute of Physics Publishing, 2018)In this work we extend the results of [1] where, Semiclassical Selfconsistent Configurations (SSC) formalism was introduced. The scheme combines quantum field theory on a background space-time, semiclassical treatment of ... -
Sensorless Adaptive Voltage Control for Classical DC-DC Converters Feeding Unknown Loads: A Generalized PI Passivity-Based Approach
(Cartagena de Indias, 2021-09-24)The problem of voltage regulation in unknown constant resistive loads is addressed in this paper from the nonlinear control point of view for second-order DC-DC converters. The converters’ topologies analyzed are: (i) buck ... -
Sequential quadratic programming models for solving the OPF problem in DC grids
(Elsevier Ltd, 2019)In this paper, we address the optimal power flow problem in dc grids (OPF-DC). Our approach is based on sequential quadratic programming which solves the problem associated with non-convexity of the model. We propose two ... -
Sequential spectral changes of Meloidogyne enterolobii-infected plants using two dimensional correlation IR spectroscopy
(Cartagena de Indias, 2020-10-29)In this work, we found that tomato and guava plants infected with Meloidogyne enterolobii showed different Fourier-transformed infrared spectral patterns compared to non-infected plants. Additionally, by using two-dimensional ... -
Sex Role Ideology of Students in a Colombian Engineering Faculty
(Cartagena de Indias, 2022-02-21)This paper examined the perceptions of students from different engineering programs at a private university in Cartagena de Indias (N = 243) with the aim of clearly identifying the profile of an engineer in training with ... -
Sex Role Ideology of Students in a Colombian Engineering Faculty
(Cartagena de Indias, 2022-02-21)This paper examined the perceptions of students from different engineering programs at a private university in Cartagena de Indias (N = 243) with the aim of clearly identifying the profile of an engineer in training with ... -
SIDS-DDoS, a Smart Intrusion Detection System for Distributed Denial of Service Attacks
(Springer, 2020)In the last few years, the Digital Services industry has grown tremendously, offering numerous services through the Internet and using a recent concept or business model called cloud computing. For this reason, new threats ... -
Simplified mathematical model for computing draining operations in pipelines of undulating profiles with vacuum air valves
(Cartagena de Indias, 2020-09-11)The draining operation involves the presence of entrapped air pockets, which are expanded during the phenomenon occurrence generating drops of sub-atmospheric pressure pulses. Vacuum air valves should inject enough air to ... -
Simultaneous Minimization of Energy Losses and Greenhouse Gas Emissions in AC Distribution Networks Using BESS
(Cartagena de IndiasCampus TecnológicoIngeniería Eléctrica, 2021-04-22)The problem of the optimal operation of battery energy storage systems (BESSs) in AC grids is addressed in this paper from the point of view of multi-objective optimization. A nonlinear programming (NLP) model is presented ... -
Sine-Cosine Algorithm for OPF Analysis in Distribution Systems to Size Distributed Generators
(Springer, 2019)This paper addresses the analysis the optimal power flow (OPF) problem in alternating current (AC) radial distribution networks by using a new metaheuristic optimization technique known as a sine-cosine algorithm (SCA). ... -
Sine-cosine algorithm for parameters' estimation in solar cells using datasheet information
(Cartagena de Indias, 2020)This paper explores the problem of optimal calculation of electrical parameters in solar cells using three well-known operative points provided by manufacturers considering a single-diode model. These are open circuit, ... -
Sistemas de información logística en hospitales : una revisión bibliometría /
(2020)En este estudio se realizó un análisis bibliométrico para evaluar cualitativa y cuantitativamente el nivel actual de investigación sobre Sistemas de información logística en hospitales. La búsqueda de documentos relacionados ... -
Skin prick test wheal detection in 3D images via convolutional neural networks
(Cartagena de Indias, 2021-10-01)The skin prick test (SPT) is performed to diagnose different types of allergies. This medical procedure requires measuring the size of the skin wheals that appear when the test is performed. However, the manual measurement ... -
Small-Signal Stability in Low-Voltage DC-Grids
(Institute of Electrical and Electronics Engineers Inc., 2018)This paper presents a general methodology for small signal stability analysis in low voltage de grids considering four type of terminals, namely: constant power, constant voltage, constant current and constant impedance. ...
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.
