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Newman–Janis Ansatz in conformastatic spacetimes
(Springer New York LLC, 2016)
The Newman–Janis Ansatz was used first to obtain the stationary Kerr metric from the static Schwarzschild metric. Many works have been devoted to investigate the physical significance of this Ansatz, but no definite answer ...
Background intensity removal in Fourier transform profilometry: A comparative study
(OSA - The Optical Society, 2016)
We study the removal of the background intensity of fringe patterns via Empirical Mode Decomposition and the Hilbert Transform. Simulation results show that the latter provides a suitable background compensation with minimal ...
Performance analysis of a microstrip patch antenna loaded with an array of metamaterial resonators
(Institute of Electrical and Electronics Engineers Inc., 2016)
An analysis of the electrical performance of a microstrip patch antenna loaded with a periodic array of metamaterial resonators is presented in this work. Hexagonal complementary split ring resonators (CSRRs) are selected ...
Expanding Influences Research to Insecure Democracies: How violence, public insecurity, economic inequality and uneven democratic performance shape journalists’ perceived work environments
(Routledge, 2017)
Democracies with sharp violence and public insecurity have proliferated in recent decades, with many also featuring extreme economic inequality. These conditions have not been explicitly considered in comparative research ...
On classical thermal stability of black holes with a dynamical extrinsic curvature
(Academic Press Inc., 2017)
We study the deformation caused by the influence of the extrinsic curvature on a vacuum spherically symmetric metric embedded in a five-dimensional bulk. We investigate the resulting black-holes obtaining general characteristics ...
Wage and subjective conditions assessing tool applied for the quality of work: Case of the manufacturing sector of the Colombian Caribbean region
(International Business Information Management Association, IBIMA, 2018)
Wage and Subjective Conditions Assessing Tool was designed and applied as a tool for assessing psychosocial components of job safety in a sample of 518 employees from different companies in the manufacturing sector of the ...
Optimal power dispatch of DGS in DC power grids: A hybrid gauss-seidel-genetic-algorithm methodology for solving the OPF problem
(World Scientific and Engineering Academy and Society, 2018)
This paper addresses the optimal power flow (OPF) problem in direct current (DC) power grids via a hybrid Gauss-Seidel-Genetic-Algorithm methodology through a master-slave optimization strategy. In the master stage, a ...
Differential diagnosis of dengue and chikungunya in colombian children using machine learning
(Springer Verlag, 2018)
Dengue and chikungunya are vector borne diseases endemic in tropical countries around the world, with very similar clinical presentation, which makes it hard for physicians to tell them apart. Here we propose the use of ...
Organizational cynicism - An exploration analysis-case: Workers in the city of Cartagena de Indias (Colombia)
(Revista Espacios, 2018)
Organizational cynicism is a fact that is present and negative within organizations. In this sense, the present study aims to approach the phenomenon of cynicism in organizations from the study of cynical attitudes composed ...
Black hole-wormhole transition in (2+1)-dimensional Einstein-anti-de Sitter gravity coupled to nonlinear electrodynamics BLACK HOLE-WORMHOLE TRANSITION in (2+1)- ⋯ PEDRO CAÑATE and NORA BRETON
(American Physical Society, 2018)
In this paper we present two results in (2+1) gravity coupled to nonlinear electrodynamics. First we determine the general form of the electromagnetic field tensor in (2+1) gravity coupled to nonlinear electrodynamics in ...
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.