Browsing Investigaciones by Title
Now showing items 1193-1212 of 1487
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QCL infrared spectroscopy combined with machine learning as a useful tool for classifying acetaminophen tablets by brand
(Cartagena de IndiasIngenieríaCampus Tecnológico, 2024-07-28)The development of new methods of identification of active pharmaceutical ingredients (API) is a subject of paramount importance for research centers, the pharmaceutical industry, and law enforcement agencies. Here, a ... -
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 ... -
Quality differentiation with flavors: Demand estimation of unobserved attributes
(Walter de Gruyter GmbH, 2013)This article estimates the demand for mint-flavored gum products using grocery store sales data and accounting for consumers' valuation of quality. Unobserved product attributes, such as flavor quality, are important ... -
Quality Improvement in Ammonium Nitrate Production Using Six Sigma Methodology
(Cartagena de Indias, 2020)Six sigma has been used in different industries to reach operational excellence. However, in the chemical industry, the application of this methodology is limited. This research presents an implementation of the six sigma ... -
Quantification of Irgafos P-168 and Degradative Profile in Samples of a Polypropylene/Polyethylene Composite Using Microwave, Ultrasound and Soxhlet Extraction Techniques
(Cartagena de IndiasCampus Tecnológico, 2024-04-21)In polypropylene/polyethylene composite (C-PP/PE) production, stabilizing additives such as Irgafos P-168 are essential as antioxidant agents. In this study, an investigation was carried out that covers different ... -
Quantification of the Synthetic Phenolic Antioxidant Cyanox 1790 in Bottled Water with SPE-HPLC/MS/MS and Determination of the Impact of the Use of Recycled Packaging on Its Generation
(Cartagena de IndiasCampus Tecnológico, 2023-02-28)One route of exposure to SPAs is through bottled water since the polymers used to make plastic bottles contain these SPAs, which migrate from the plastic to the water. Solid-phase extraction (SPE), HPLC-MS, FTIR, and DSC ... -
Quantitatively relating cosmic rays intensities from solar activity parameters based on structural equation modeling
(Cartagena de Indias, 2023-03-06)Cosmic rays measured through neutron monitors on Earth’s surface have a strong correlation with the number of sunspots on the solar photosphere. Other indices that affect the dynamics of the heliosphere and distortions ... -
Quantum machine learning for intrusion detection of distributed denial of service attacks: a comparative overview
(Cartagena de Indias, 2021-03-01)In recent years, we have seen an increase in computer attacks through our communication networks worldwide, whether due to cybersecurity systems' vulnerability or their absence. This paper presents three quantum models to ... -
Quasi-static flow model for predicting the extreme values of air pocket pressure in draining and filling operations in single water installations
(Cartagena de Indias, 2020)Inertial models have been used by researchers to simulate the draining and filling processes in water pipelines, based on the evolution of the main hydraulic and thermodynamic variables. These models use complex differential ... -
QuBiLs-MAS method in early drug discovery and rational drug identification of antifungal agents
(Taylor and Francis Ltd., 2015)The QuBiLs-MAS approach is used for the in silico modelling of the antifungal activity of organic molecules. To this effect, non-stochastic (NS) and simple-stochastic (SS) atom-based quadratic indices are used to codify ... -
¿Qué es y hacia dónde va la fotografía?
(Cartagena de Indias, 2021-07-01) -
Rapid Filling Analysis with an Entrapped Air Pocket in Water Pipelines Using a 3D CFD Model
(Cartagena de Indias, 2023-02-21)A filling operation generates continuous changes over the shape of an air–water interface, which can be captured using a 3D CFD model. This research analyses the influence of different hydro-pneumatic tank pressures and ... -
Rapid Mapping of Waterbody Variations in the Central Rift Valley, Ethiopia, Using the Digital Earth Africa Open Data Cube
(Cartagena de IndiasCiencias Básicas, 2023-10-20)Mapping waterbodies variations through time is only possible thanks to the use of in-situ hydrometric sensors or remotely sensed data. Few areas around the world count with a functional in-situ sensor’s network, but all ... -
Rasch Analysis of the Q-CHAT in Colombian Toddlers with Autism Spectrum Disorder
(Springer New York LLC, 2019)The objective of this study was the validation of the Colombian version of The Quantitative Checklist for Autism in Toddlers (Q-CHAT) by means of the Rasch Rating Scale Model. The Q-CHAT was applied to parents of 100 ... -
Reactive scheduling in collaborative supply chain: A literature review
(Revista Espacios, 2017)This paper aims to review the literature on the reprogramming of production in collaborative supply chains, through a thorough investigation and Scientometric analysis to identify the behavior of publications in recent ... -
Recent Developments
(Cartagena de Indias, 2022-12-31)Editor-in-Chief Andres Marrugo discusses the latest developments in the journal -
Recovery of (Z)-13-Docosenamide from Industrial Wastewater and Its Application in the Production of Virgin Polypropylene to Improve the Coefficient of Friction in Film Type Applications
(Cartagena de Indias, 2023-01-09)Additives play an important role in the production of plastic materials through their application, in which the mechanical, thermal, and physical properties of polymers are improved, making them last longer and be more ... -
Recovery of (Z)-13-Docosenamide from IndustrialWastewater and Its Application in the Production of Virgin Polypropylene to Improve the Coefficient of Friction in Film Type Applications
(Cartagena de IndiasCampus Tecnológico, 2023-01-09)Abstract: Additives play an important role in the production of plastic materials through their application, in which the mechanical, thermal, and physical properties of polymers are improved, making them last longer and ... -
Recovery of an Antioxidant Derived from a Phenolic Diphosphite from Wastewater during the Production of a Polypropylene Compound: A Step towards Sustainable Management
(Cartagena de IndiasCampus Tecnológico, 2024-06-11)Organic phosphoester (OPE) antioxidants are currently required due to their contribution to enhancing the quality of polymers, including polypropylene (PP). In this research, an integral methodology is presented for the ... -
Recursive convex approximations for optimal power flow solution in direct current networks
(Cartagena de Indias, 2022-08-12)The optimal power flow problem in direct current (DC) networks considering dispersal generation is addressed in this paper from the recursive programming point of view. The nonlinear programming model is transformed into ...
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.
