Listar Productos de investigación por título
Mostrando ítems 319-338 de 1373
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Conformastatic disk-haloes in Einstein-Maxwell gravity
(2013)We present a relativistic model describing a thin disk surrounded by a halo in the presence of an electromagnetic field. The model is obtained by solving the Einstein-Maxwell equations on a particular conformastatic spacetime ... -
Conformastationary disk-haloes in Einstein–Maxwell gravity
(Springer New York LLC, 2015)An exact solution of the Einstein–Maxwell field equations for a conformastationary metric with magnetized disk-haloes sources is worked out in full. The characterization of the nature of the energy momentum tensor of the ... -
Consistency in valuation: A practical guide
(Consejo Latinoamericano de Escuelas de Administracion, 2010)Practitioners and teachers easily break some consistency rules when conducting or teaching valuation of assets, which may lead to different results by different methods. In this short note we present a practical guide to ... -
Construct validation of the Narcissistic Admiration and Rivalry Questionnaire in Spanish-speaking countries: Assessment of the reliability, structural and external validity and cross-cultural equivalence
(Wiley-Blackwell Publishing Ltd, 2019)A recent re-operationalisation of grandiose narcissism has resulted in the distinction of two narcissistic strategies based on the cognitive, affective-motivational and behavioural dynamics: admiration (assertive ... -
Construction and validation of the Scale of Acceptance to the School Violence (EAVE)
(Group Psychology Campus Univalle - GEPU, 2014)[No abstract available] -
Contribution of CFRP to the shear strength of retrofitted lightly-reinforced concrete panels
(Cartagena de Indias, 2021-07-12)Low-rise buildings with thin Reinforced Concrete (RC) walls that do not comply with the minimum web shear reinforcement prescribed by current earthquake-resistant codes can be found in some Latin American countries. Previous ... -
Control by second order sliding modes for a double-fed induction generator for a wind turbine
(Cartagena de Indias, 2020)In recent years, the consumption of electrical energy in the world has increased, increasing the construction of power plants that operate with fossil fuels, which emit a large amount of CO2. Due to this polluting process, ... -
Control for EESS in Three-Phase Microgrids under Time-Domain Reference Frame via PBC Theory
(Institute of Electrical and Electronics Engineers Inc., 2019)This brief presents a general form of designing passivity-based controllers for electrical energy storage systems (EESS) in three-phase microgrids (TP-MGs) under time-domain reference frame. The control strategy proposed ... -
Control neuro-fuzzy para páncreas artificial desarrollo y validación in-silico
(Cartagena de Indias, 2020)La Diabetes Mellitus Tipo 1 (DMT1) es una de las enfermedades actuales más dañinas que afectan a personas de cualquier edad incluyendo niños desde el nacimiento. Las inyecciones de insulina exógena siguen siendo el tratamiento ... -
Control of a charging station for electric vehicles
(Cartagena de Indias, 2020)A weighted average current control applied to a three-phase inductor-capacitor-inductor grid-connected battery charger for electric vehicles is presented in this paper. The proposed controller is based on a combination of ... -
Control of a DC-DC converter with dual active bridges to adapt voltage levels in DC microgrids using feedback linearization
(Cartagena de Indias, 2022)En este trabajo, se propone una estrategia de control para un convertidor DC-DC con puentes duales activos que interconecta dos alimentadores de una microrred de DC. La estrategia de control propuesta, permite regular la ... -
Control of a SMES for mitigating subsynchronous oscillations in power systems: A PBC-PI approach
(Elsevier Ltd, 2018)This paper proposes a methodology to control the active and reactive power of a superconducting magnetic energy storage (SMES) system to alleviate subsynchronous oscillations (SSO) in power systems with series compensated ... -
Control of Photovoltaic Plants Interconnected via VSC to Improve Power Oscillations in a Power System
(Cartagena de Indias, 2022)This paper presents an integrated methodology applied to photovoltaic (PV) plants for improving the dynamic performance of electric power systems. The proposed methodology is based on primary frequency control, which adds ... -
Control System for Project Management in a Construction Sector Company through the Earned Value Technique in the Caribbean
(Cartagena de Indias, 2022)The present research work generates a solution to some inconveniences presented in an organization that executes construction projects, which has presented problems of delays in the works, cost overruns in the activities ... -
Control temperature of the air conditioning system of a vessel from exergoeconomic analysis
(Cartagena de Indias, 2021-11-01)In this work the air conditioning system of a 93 m long and 14 m wide vessel with 4081 refrigerated m3 distributed in 51 premises is studied. In which energy, exergetic and exergoeconomic analyzes were carried out for ... -
Controller design for VSCs in distributed generation applications: An IDA-PBC approach
(Institute of Electrical and Electronics Engineers Inc., 2019)This paper presents an asymptotically stable global controller design for distributed energy integration in electrical distribution networks using a three-phase voltage source converter (VSC). An invariant Park's transformation ... -
Conventional and advanced exergetic analysis for the combined cycle of power plant with gas turbine of a refinery
(Cartagena de Indias, 2021-11-01)This article shows the results of the performance study of a combined cycle plant made up of a Siemens STG-800 gas turbine and a MACCHI heat recovery boiler (HRSG) designed to produce 47.5 MW of electricity and 81908 kg / ... -
Conventional and advanced exergoeconomic indicators of a nitric acid production plant concerning the cooling temperature in compression Train’s intermediate stages
(Cartagena de Indias, 2021-07-30)In the refining and petrochemical industrial sector, large amounts of energy are used, so using the concept of exergy allows a rational use of this resource. In the different exergy and exergoeconomics studies applied in ... -
Convergence analysis of the triangular-based power flow method for AC distribution grids
(Cartagena de Indias, 2021-06-30)This paper addresses the convergence analysis of the triangular-based power flow (PF) method in alternating current radial distribution networks. The PF formulation is made via upper-triangular matrices, which enables ... -
Las cooperativas rurales una oportunidad para repensar el rol del Estado frente a los impactos de la regulación de semillas en Colombia
(Cartagena de Indias, 2020-11-11)El presente artículo analiza los diversos factores que inciden en la situación de vulnerabilidad en el que se encuentra el sector rural en Colombia, la cual se ha visto reforzada por el régimen de certificación de semillas ...
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.