Listar Productos de investigación por título
Mostrando ítems 573-592 de 1394
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Exact minimization of the energy losses and the CO2 emissions in isolated DC distribution networks using PV sources
(Cartagena de Indias, 2021-04-28)This paper addresses the optimal location and sizing of photovoltaic (PV) sources in isolated direct current (DC) electrical networks, considering time-varying load and renewable generation curves. The mathematical ... -
Exact relativistic magnetized haloes around rotating disks
(Hindawi Publishing Corporation, 2015)The study of the dynamics of magnetic fields in galaxies is one of important problems in formation and evolution of galaxies. In this paper, we present the exact relativistic treatment of a rotating disk surrounded by a ... -
Exact relativistic models of thin disks around static black holes in a magnetic field
(2014)The exact superposition of a central static black hole with surrounding thin disk in presence of a magnetic field is investigated. We consider two models of disk, one of infinite extension based on a Kuzmin-Chazy-Curzon ... -
EXERGOECONOMIC ANALYSIS in A CEMENT PRODUCTION PLANT
(Cartagena de Indias, 2020)A dry-type Cement Production Plan of 151 Tons per hour was taken as a case of study to implement an exergoeconomic analysis. In this paper, the exergy destruction and the investment costs of the system's units were calculated ... -
Exergy study of air-conditioned space of a prototype scale of a river vessel room
(American Society of Mechanical Engineers (ASME), 2016)The study was conducted on a scale prototype, which simulates one of the rooms in the real vessel air conditioning system. The main results are as follows: the higher the thermal load, the higher the exergy destruction, ... -
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 ... -
Experiences with the use of Snap Circuits and Arduino boards as tools for human development with students in an insular Colombian community
(Latin American and Caribbean Consortium of Engineering Institutions, 2018)Insular communities in Colombia have had significant lags in human development. As a strategy to help overcome these shortcomings, this paper proposes the use of technological tools such as Snap Circuits and Arduino boards. ... -
Experiencias en gestión del riesgo climático : estrategias de participación comunitaria frente al cambio climático en América Latina /
(2020)El clima mundial está cambiando a un ritmo acelerado, y como consecuencia de ello, los países en desarrollo son más vulnerables a los cambios climaÌticos que los paiÌses desarrollados debido a una mayor exposicioÌn a ... -
Experimental and numerical analysis of a water emptying pipeline using different air valves
(MDPI AG, 2017)The emptying procedure is a common operation that engineers have to face in pipelines. This generates subatmospheric pressure caused by the expansion of air pockets, which can produce the collapse of the system depending ... -
Experimental data on the production and characterization of biochars derived from coconut-shell wastes obtained from the Colombian Pacific Coast at low temperature pyrolysis
(Elsevier Inc., 2020)Biochars are emerging eco-friendly products showing outstanding properties in areas such as carbon sequestration, soil amendment, bioremediation, biocomposites, and bioenergy. These interesting materials can be synthesized ... -
Experimental investigation of high-speed melt spinning by means of digital image analysis
(OSA - The Optical Society, 2016)We carry out an experimental characterization via high-speed camera of Chill-Block Melt Spinning process by means of digital optical flow for melt ejection velocity calculation and temperature measurement. © OSA 2016. -
Experimental Study of the Impact of Trace Amounts of Acetylene and Methylacetylene on the Synthesis, Mechanical and Thermal Properties of Polypropylene
(Cartagena de Indias, 2022)During the production of polymer-grade propylene, different processes are used to purify this compound and ensure that it is of the highest quality. However, some impurities such as acetylene and methyl acetylene are ... -
Experimental–Density Functional Theory (DFT) Study of the Inhibitory Effect of Furan Residues in the Ziegler–Natta Catalyst during Polypropylene Synthesis
(Cartagena de IndiasCampus Tecnológico, 2023-09-21)In this experimental–theoretical study, the effect of furan on Ziegler–Natta catalyst produc tivity, melt flow index (MFI), and mechanical properties of polypropylene were investigated. Through the analysis of the global ... -
Explorando la desigualdad urbana a través de la fotografía vernácula. Estudio de caso en una ciudad latinoamericana
(Cartagena de IndiasCampus TecnológicoComunicación Social, 2021-05-05)Uno de los elementos que caracterizan al espacio urbano contemporáneo en Latinoamérica se halla en la expansión de las condiciones de pobreza y desigualdad. Este hecho se ha acentuado en el último siglo en grandes urbes ... -
Extended Feedback Linearization Control for Voltage Regulation in a Buck Converter with an Unknown Resistive Load
(Cartagena de Indias, 2023)This paper deals with the control problem in a buck converter while considering an unknown resistive load. The control design is based on extended feedback linearization (EFL) theory, which allows finding a general control ... -
Extended focused image in white light scanning interference microscopy
(Cartagena de Indias, 2019)We propose a method to obtain a fringe-free extended focused image in white light scanning interference microscopy based on processing the stack of images over a range within the coherence length of the source. © 2019 The ... -
Extension of the B3LYP-dispersion-correcting potential approach to the accurate treatment of both inter-and intra-molecular interactions
(2013)We recently demonstrated that dispersion-correcting potentials (DCPs), which are atom-centered Gaussian-type functions that were developed for use with B3LYP (Torres and DiLabio in J Phys Chem Lett 3:1738-1744, 2012), ... -
Extraction of decision rules using genetic algorithms and simulated annealing for prediction of severity of traffic accidents by motorcyclists
(Cartagena de Indias, 2021)The objective of this study is to analysis of accident of motorcyclists on Bogotá roads in Colombia. For detection of conditions related to crashes and their severity, the proposed model develops the strategies to enhance ... -
Fabrication of carbon nanofibrous microelectrode array (CNF-MEA) using nanofiber immersion photolithography
(Institute of Electrical and Electronics Engineers Inc., 2014)Microelectrode arrays (MEAs) are widely used for stimulating and receiving electrical signals between human and machines and for in vitro neural study. This work demonstrates the fabrication process of nanofibrous 3D ... -
Factores asociados al comportamiento de las ventas de los servicios de Reparación y Mantenimiento de Embarcaciones de hasta 3.600 toneladas en los años 2010 a 2020 en un Astillero del Caribe /
(2020)La predicción de las ventas a mediano y largo plazo es uno de los problemas más complejos para las empresas de servicios en el sector marítimo, pues las dinámicas de estos sectores empresariales dependen tanto de factores ...
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.