Investigaciones: Envíos recientes
Mostrando ítems 141-160 de 1465
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A machine learning model to predict standardized tests in engineering programs in Colombia
(Cartagena de Indias, 2023-08)This research develops a model to predict the results of Colombia’s national standardized test for Engineering programs. The research made it possible to forecast each student’s results and thus make decisions on reinforcement ... -
Detection of forest windthrows with bitemporal COSMO-SkyMed and Sentinel-1 SAR data
(Cartagena de IndiasCampus Tecnológico, 2023-08-29)Wind represents a primary source of disturbances in forests, necessitating an assessment of the resulting damage to ensure appropriate forest management. Remote sensing, encompassing both active and passive techniques, ... -
Improving Pump Characteristics through Double Curvature Impellers: Experimental Measurements and 3D CFD Analysis
(Cartagena de Indias, 2023-07-27)The outlet angle and shape of impeller blades are important parameters in centrifugal pump design. There is a lack of detailed studies related to double curvature impellers in centrifugal pumps in the current literature; ... -
Impact of Traces of Hydrogen Sulfide on the Efficiency of Ziegler–Natta Catalyst on the Final Properties of Polypropylene
(Cartagena de Indias, 2022-09-19)Sulfur compounds are removed from propylene through purification processes. However, these processes are not 100% effective, so low concentrations of compounds such as H2S may be present in polymer-grade propylene. This ... -
Effects of Different Concentrations of Arsine on the Synthesis and Final Properties of Polypropylene
(Cartagena de Indias, 2022-07-31)This article studies the effects of arsine on the synthesis and thermal degradation of 4 sam ples of virgin polypropylene (PP-virgin) and proposes reaction mechanisms that allow understanding of its behaviour. Different ... -
Identification and Quantification of Microplastics in Effluents of Wastewater Treatment Plant by Differential Scanning Calorimetry (DSC)
(Cartagena de Indias, 2022-04-20)In this research, the presence of microplastics was detected through a differential scanning calorimetry (DSC) analysis of three wastewater treatment plants. One of these plants applied only a preliminary treatment stage ... -
Parts per Million of Propanol and Arsine as Responsible for the Poisoning of the Propylene Polymerization Reactio
(Cartagena de Indias, 2023-09-01)Polypropylene synthesis is a critical process in the plastics industry, where control of catalytic activity is essential to ensure the quality and performance of the final product. In this study, the effect of two ... -
Rethinking environmental news coverage through Agenda-Setting and the normative function of attributes
(Cartagena de IndiasCampus TecnológicoComunicación Social, 2023-05-07)Examinamos los atributos sustantivos y afectivos dominantes en 358 noticias relacionadas con la gestión del agua y los residuos en Colombia durante cinco años. Los resultados revelaron que los textos estudiados se centraron ... -
Applying a Green Solvent with Microwave, Ultrasound, and Soxhlet Extraction Techniques to Quantify the Slip Additive Cis-1,3-docosenamide and Nine Oxidative Degradation Byproducts in Polypropylene Samples
(Cartagena de IndiasCampus Tecnológico, 2023-08-18)Erucamide is used as an important slip agent for polymers. However, erucamide can degrade during processing and long-term storage, forming various oxidation products. These degra dation products can affect the recovery ... -
Effect of pyrolysis, impregnation, and calcination conditions on the physicochemical properties of TiO2/Biochar composites intended for photocatalytic applications
(Cartagena de IndiasCampus TecnológicoIngeniería Ambiental, 2023-06-02)Biochars are outstanding materials obtained from the pyrolysis of biomass, possessing unique physicochemical properties that are attractive for many environmental applications, including photocatalysis. In this work, we ... -
Subordinación de la mujer en los libros educativos de Cartagena
(Cartagena de IndiasCampus TecnológicoPsicología, 2023-05-22)Introducción. El sexismo es un patrón cognitivo y comportamental en el cual la figura masculina atribuye a la femenina caracteres que reflejan vulnerabilidad e indefensión alrededor de todas las dimensiones del desarrollo. ... -
Statistical Approach for Computing Base Flow Rates in Gaged Rivers and Hydropower Effect Analysis
(Cartagena de Indias, 2023-06-27)The calculation of base flow rates in rivers is complex since hydrogeological and hydrological studies should be performed. The estimation of base flow rates in storm hydrograph associated to various return periods is ... -
Different Experimental and Numerical Models to Analyse Emptying Processes in Pressurised Pipes with Trapped Air
(Cartagena de Indias, 2023-06-29)In hydraulic engineering, some researchers have developed different mathematical and numerical tools for a better understanding of the physical interaction between water flow in pipes with trapped air during emptying ... -
Analyzing traffic conflicts and the behavior of motorcyclists at unsignalized three-legged and four-legged intersections in Cartagena, Colombia
(Cartagena de IndiasCampus TecnológicoIngeniería Industrial, 2023-07-14)Introduction: The global motorcycle market has grown significantly, with over 770 million vehicles estimated to be in use worldwide. Motorcycle-related road traffic deaths in low and middle-income countries (LMICs) like ... -
Comparing Journalistic Role Performance Across Thematic Beats: A 37-Country Study
(Cartagena de IndiasCampus TecnológicoComunicación Social, 2023-06-29)Studies suggest that, at the routine level, news beats function as unique “micro-cultures.” Exploring this “particularist” approach in news content, we compare how the interventionist, watchdog, loyal, service, infotainment, ... -
Abundance and distribution of cigarette butts on the sand of five touristic beaches in Latin America during the COVID-19 pandemic
(Cartagena de Indias, 2023-07-15)Cigarette butts (CB) and cigarette butt fibers (CBF) are highly abundant and frequent residues on beach sand. Also, they are hazardous waste due to their significant toxicity and potential risk to the ecosystems’ biota ... -
In-situ imaging and electrochemical monitoring of damaged thermal spray aluminium coating in synthetic seawater
(Cartagena de IndiasCampus TecnológicoIngeniería Mecánica, 2023-07-14)This paper presents the results of a study that combined electrochemical monitoring with in-situ imaging of Thermal Spray Aluminium (TSA) coating in synthetic seawater at room temperature in quiescent condition. The coatings ... -
Speckle interferometry single-shot applications with multiple carrier-fringe information
(Cartagena de Indias, 2023-06-15)The need for robust equipment that allows identifying defects or measuring small displacements in a harsh environment has been a requirement in the aeronautical and principally in the Oil & Gas industry. In this field, ... -
Polarization study in Newtonian telescope components for depolarization parameter correction in atmospheric LiDAR
(Cartagena de Indias, 2023-06-12)In the present work, an experimental system is implemented, and a theoretical model is built that allows quanti fying atmospheric depolarization in the city of Santiago de Cali, Colombia. The experimental setup uses a ... -
Equivalence of categories of simple Lie algebras in positive characteristic
(Cartagena de IndiasCampus Tecnológico, 2022-07-18)In this paper we first study some properties of the finite-dimensional simple restricted Lie algebras. In the literature is found a one-to-one correspondence between them and finite-dimensional simple Lie algebras over a ...
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.
