Investigaciones: Envíos recientes
Mostrando ítems 841-860 de 1465
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Optimal Design of Transmission Shafts Using a Vortex Search Algorithm
(Cartagena de Indias, 2021-01-02)This paper analyzes the problem of optimally sizing a transmission shaft via the vortex search algorithm (VSA) optimizer. The objective function was to minimize the shaft weight through an adequate selection of the diameters ... -
A hybrid approach based on socp and the discrete version of the sca for optimal placement and sizing dgs in ac distribution networks
(Cartagena de Indias, 2020-12-27)This paper deals with the problem of the optimal placement and sizing of distributed generators (DGs) in alternating current (AC) distribution networks by proposing a hybrid master–slave optimization procedure. In the ... -
Toward an adaptive protection scheme in active distribution networks: Intelligent approach fault detector
(Cartagena de Indias, 2021-01)Conventional protection schemes have proven insufficient for the protection of Active Distribution Networks (ADN). Novel protection schemes with an adaptive approach should be developed to guarantee the protection of ADN ... -
Performance evaluation of structures with reinforced concrete columns retrofitted with steel jacketing
(Cartagena de Indias, 2021-01)Several existing reinforced concrete (RC) buildings fail to conform with current seismic codes, increasing its susceptibility to damage and collapse during earthquakes. A concern for building upgrading and rehabilitation ... -
A mlpg formulation for stress analysis in bi-dimensional elastic bodies
(Cartagena de Indias, 2020-08-11)In this work, a meshfree method known as Meshless Local Petrov-Galerkin was implemented in a bidimensional linear elasticity problem. Bidimensional MLS shape functions were used in the polynomial approximation of the ... -
Latencies in power systems: A database-based time-delay compensation for memory controllers
(Cartagena de Indias, 2021-01-18)Time-delay is inherent to communications schemes in power systems, and in a closed loop strategy the presence of latencies increases inter-area oscillations and security problems in tie-lines. Recently, Wide Area Measurement ... -
A mixed-integer convex model for the optimal placement and sizing of distributed generators in power distribution networks
(Cartagena de Indias, 2021-01-11)The optimal placement and sizing of distributed generators is a classical problem in power distribution networks that is usually solved using heuristic algorithms due to its high complexity. This paper proposes a different ... -
A mixed-integer conic formulation for optimal placement and dimensioning of DGs in DC distribution networks
(Cartagena de Indias, 2021-01-14)The problem of the optimal placement and dimensioning of constant power sources (i.e., distributed generators) in electrical direct current (DC) distribution networks has been addressed in this research from the point of ... -
On the convergence of the power flow methods for DC networks with mesh and radial structures
(Cartagena de Indias, 2021-02)The convergence analysis of the power flow methodologies for direct current (dc) electrical networks is addressed in this paper. The Banach fixed-point theorem is employed to prove the convergence and uniqueness in the ... -
Variable control tool in MATLAB for energy transformation processes
(Cartagena de Indias, 2020-10)During the stages of transformation of energy in a process, exercise control over the variables that intervene in it, improve its performance, and identify undesirable conditions in these. Thus, this study is developed as ... -
Validation of the Streeter-Phelps Model in Matlab to predict biochemical demand for oxygen DOB and dissolved oxygen OD
(Cartagena de Indias, 2020-12-24)The article intended the validation of the Streeter Phelps mathematical model that describes the behavior of dissolved oxygen OD and the biochemical oxygen demand BOD, which includes re- aeration and deoxygenation processes, ... -
Trajectory-tracking control of a planar parallel robot using generalized predictive control with constraints
(Cartagena de Indias, 2020)This paper presents the generalized predictive control with constraints, implemented to a planar parallel robot in order to calculate and track the desired trajectory of the end-effector of this robot. The manipulator is ... -
Sustainable engineering and Internet of Things (IoT): Trends and perspectives
(Cartagena de Indias, 2020-07)Internet of Things – IoT appeared in the forecast of engineering three decades ago. Since then, a vast range of applications has been developed in industrial, urban, and rural matters, where one of the most relevant issues ... -
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, ... -
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 ... -
Representación de la historia de España por medio de la filatelia. Estudio de los sellos diseñados por Gallego y Rey
(Cartagena de Indias, 2020)Se presenta un análisis pormenorizado de todos los sellos postales españoles elaborados por los humoristas gráficos Gallego y Rey, los cuales pretendieron reflejar la historia española. Este peculiar tipo de producto ... -
Removing Omissions and Inconsistencies from the ISA 5.1 Narratives of Industrial Processes
(Cartagena de Indias, 2020-12-25)This work is concerned with the modelling of industrial processes, described by Pipe and Instrumentation Diagrams (P&ID) and narratives as specified in the norm ISA 5.1, by Interpreted Petri Nets (IPN). In a previous work, ... -
Professional Autonomy and Structural Influences: Exploring How Homicides, Perceived Insecurity, Aggressions Against Journalists, and Inequalities Affect Perceived Journalistic Autonomy in Colombia
(Cartagena de Indias, 2020)Journalistic autonomy has been studied more frequently in countries with secure democracies in terms of journalists’ perceptions of freedom and independence to work in the midst of the controls, pressures, and influences ... -
Preliminary machine learning model for citrus greening disease (Huanglongbing-HLB) prediction in Colombia
(Cartagena de Indias, 2020-11-09)Citrus greening disease (Huanglongbing-HLB) is considered the most destructive citrus disease worldwide. Of the three species of Candidatus liberibacter associated with HLB, two have been recently reported in Latin America. ... -
Predictive power control for electric vehicle charging applications
(Cartagena de Indias, 2020-12-01)This paper presents a direct predictive power control (DPPC) design for vehicle charging applications. The proposed control design allows working in the Park's reference frame avoiding the usage of the phase-lock loops, ...
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.
