Investigaciones: Envíos recientes
Mostrando ítems 1401-1420 de 1422
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Dust particle artifact detection and removal in retinal images
(Sociedad Espanola de Optica, 2017)Retinal fundus cameras suffer from dust particles attaching to the sensor and lens, which manifest as small artifacts on the images. We propose a new strategy for the detection and removal of dust particle artifacts in ... -
Study on high throughput nanomanufacturing of photopatternable nanofibers using tube nozzle electrospinning with multi-tubes and multi-nozzles
(Society of Micro and Nano Systems, 2017)High throughput nanomanufacturing of photopatternable nanofibers and subsequent photopatterning is reported. For the production of high density nanofibers, the tube nozzle electrospinning (TNE) process has been used, where ... -
Emptying operation of water supply networks
(MDPI AG, 2017)Recently, emptying processes have been studied in experimental facilities in pipelines, but there is a lack regarding applications in actual pipelines, which permits establishing the risk of collapse because of sub-atmospheric ... -
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 ... -
A preface to the 70&70 Gravity Fest
(Institute of Physics Publishing, 2017)[No abstract available] -
Viscosity analysis in lubricants through factorial design with three factors
(Latin American and Caribbean Consortium of Engineering Institutions, 2018)In the field of statistics, the experimental design becomes an analysis tool to establish the ideal conditions of a very important process and / or product, analysis of variance it is very useful in cases where there are ... -
Camera-projector calibration methods with compensation of geometric distortions in fringe projection profilometry: A comparative study
(Sociedad Espanola de Optica, 2018)The calibration methods most used in fringe projection profilometry are based on models of least squares adjustment and stereo vision techniques. However, the geometric distortions of the projector and camera lenses introduce ... -
Fringe quality map for fringe projection profilometry in LabVIEW
(Sociedad Espanola de Optica, 2018)The phase retrieval process is mainly affected by local shadows, irregular surface brightness and fringe discontinuities. To overcome these problems, image-processing strategies are carried out such as binary masks, ... -
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. ... -
Effect of the non-stationarity of rainfall events on the design of hydraulic structures for runoff management and its applications to a case study at Gordo Creek watershed in Cartagena de Indias, Colombia
(MDPI AG, 2018)The 24-h maximum rainfall (P 24h-max ) observations recorded at the synoptic weather station of Rafael Núñez airport (Cartagena de Indias, Colombia) were analyzed, and a linear increasing trend over time was identified. ... -
Quality changes in fundus images of pseudophakic eyes
(Sociedad Espanola de Optica, 2018)We consider the changes produced in the quality of eye fundus images of patients before and after cataract surgery with intraocular lens implantation and propose a measure to quantitatively assess those changes. Several ... -
Active and reactive power conditioning using SMES devices with PMW-CSC: A feedback nonlinear control approach
(Ain Shams University, 2019)The active and reactive power conditioning using superconducting magnetic energy storage (SMES) systems for low-voltage distribution networks via feedback nonlinear control is proposed in this paper. The SMES system is ... -
Optimal selection of conductors in distribution systems using tabu search algorithm [Selección óptima de conductores en sistemas de distribución empleando el algoritmo búsqueda tabú]
(Universidad de Tarapaca, 2018)An efficient methodology for the optimal selection of conductor in distribution systems through the implementation of the metaheuristic optimization technique called Tabu Search is presented in this paper. To represent the ... -
Modeling of dynamic mass coupled system with Runge-Kutta fourth order
(Institute of Physics Publishing, 2019)This paper shows the mathematical modeling process of a mechanical system of masses coupled by two springs and a shock absorber. The process of capture of movement of the mass system coupled with springs was done with ... -
Application of data mining for the classification of university programs of industrial engineering accredited in high quality in Colombia
(Centro de Informacion Tecnologica, 2018)The present research article proposes a method to classify University engineering programs, placing special attention to relations between the subjects of the curriculum and the 12 areas of knowledge established in the ... -
Data envelopment analysis method and neural networks in the evaluation and prediction of the technical efficiency of small exporting companies
(Centro de Informacion Tecnologica, 2018)In this research, a method was developed to evaluate and predict the efficiency of small exporting companies taking as input or asset variables the total assets, equity, total liabilities, operating expenses, sales costs ... -
Perchlorate-Reducing Bacteria from Hypersaline Soils of the Colombian Caribbean
(Hindawi Limited, 2019)Perchlorate (ClO 4 - ) has several industrial applications and is frequently detected in environmental matrices at relevant concentrations to human health. Currently, perchlorate-degrading bacteria are promising strategies ... -
Distributed energy resources integration in AC Grids: A family of passivity-based controllers
(Universitat Politecnica de Valencia, 2019)This paper presents the design and application of passivity-based control theory for distributed energy resources (DERs) integration through voltage source converters (VSC) in ac single-phase grids. The Hamiltonian ... -
Light-induced control of the spin distribution on Cu–dithiolene complexes: A correlated ab initio study
(MDPI AG, 2019)Metal dithiolene complexes—M(dmit)2—are key building blocks for magnetic, conducting, and optical molecular materials, with singular electronic structures resulting from the mixing of the metal and dmit ligand orbitals. ... -
Nonlinear analysis and control of a reaction wheel pendulum: Lyapunov-based approach
(Elsevier B.V., 2019)This paper presents a nonlinear analysis, control, and comparison of controllers based on the dynamical model of the reaction wheel pendulum (RWP) in a tutorial style. Classical methodologies such as proportional integral ...
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.