Fototeca Histórica Cartagena de Indias
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Use of a 416B-type central-hybrid experimental design to evaluate the synthesis conditions of TiO2/biochar composites on the solid-state photocatalytic degradation of polypropylene-plastic films
(2025-03-06) Castilla Caballero, Deyler Rafael; Medina Guerrero, Astrid del Rosario; Hernández Ramírez, Aracely; Vázquez Rodríguez, Sofía; Colina Márquez, José; Machuca Martínez, Fiderman; Barraza Burgos, Juan; Roa Espinosa, Aicardo; Gunasekaran , Sundaram; Sundaram
This study presents an innovative application of solid-state photocatalysis using environmentally friendly TiO2/biochar composites to degrade polypropylene (PP) films and reduce plastic pollution. Biochar, derived from coconut shells via controlled pyrolysis, was combined with TiO2 to enhance photocatalytic activity. A 416B-type Central-Hybrid Experimental Design was used to optimize synthesis parameters, revealing that biochar produced at 280°C with 4.1 % v/v oxygen and a TiO2/biochar weight ratio of 1.5 yields the best results. After 25 days of UV irradiation, films incorporated with TiO2/biochar composites exhibited an 8.7 % weight loss and a carbonyl index of 11.4—significantly surpassing pristine PP films. These findings demonstrate the potential of biochar as a sustainable solution to reduce nanotoxicity while boosting polymer degradation efficiency. This work contributes to the development of eco-friendly materials for mitigating plastic waste challenges.
Informe final del proyecto Memoria cultural de los barrios populares de Cartagena de Indias a partir de los álbumes fotográficos de la comunidad
(2023) Baltar-Moreno, Adolfo
Informe final del proyecto Memoria cultural de los barrios populares de Cartagena de Indias a partir de los álbumes fotográficos de la comunidad, ganador de la Convocatoria Interna de Proyectos de Investigación de la Universidad Tecnológica de Bolívar 2023. El informe refleja el trabajo de recuperación de la memoria periférica de la ciudad realizado entre 2024 y 2025 por el Semillero de Historia de la Fotografía en el Caribe Colombiano en tres barrios de populares de Cartagena de Indias: San Francisco, César Flórez y el corregimiento de Tierrabomba. Se reflexiona sobre el alcance social del proyecto y los productos de investigación logrados.
Deep learning in multi-sensor agriculture and crop management
(2025-03-10) Solano Correa, Yady Tatiana; Arrechea Castillo, Darwin Alexis
The integration of deep learning (DL) with multi-sensor data acquisition technologies is revolutionizing the field of agriculture and crop management, offering unprecedented precision and efficiency in monitoring and decision-making processes. This chapter explores the synergy between advanced DL algorithms and multi-sensor data. By integrating data from optical, SAR, thermal, and hyperspectral sensors, DL models offer higher accuracies in crop monitoring, classification, yield prediction, and stress detection, among other applications. This chapter highlights recent developments in the application of Convolutional Neural Networks (CNNs), Long Short-Term Memory (LSTM) networks, and transformers to analyze complex agricultural datasets, overcoming challenges related to environmental variability and the need for large-scale data. Despite computational and implementation challenges, these technologies promise enhanced crop yields, sustainability, and resource efficiency. The chapter emphasizes the importance of scalable and interpretable models, as well as integrated systems that leverage real-time data for informed decision-making, marking a huge step towards next-generation smart agriculture practices.
Plataforma europea de Resolución de Litigios en Línea (RLL): ecosistema digital en vía de extinción
(2024-12-31) Perilla Granados, Juan Sebastián Alejandro
A través del Reglamento (UE) 3228/2024 del Parlamento Europeo y Consejo se derogó el Reglamento (UE) 524/2013 y se modificaron los Reglamentos (UE) 2394/2017 y (UE) 1724/2018 para la supresión del ecosistema digital de Resolución de Litigios en Línea (RLL), el cual tenía tres funcionalidades principales: informar acerca de los alcances jurídicos del derecho del consumo, facilitar canales de comunicación directos para la gestión de disputas de forma directa y sugerir vías de solución de conflictos cuando la auto composición no es posible. Esta decisión responde a que se trataba de un diseño formalista con múltiples cuestionamientos antiformalistas. Entre otras razones, se evidenció que este ecosistema digital no materializa los derechos de los consumidores a plenitud, lo cual es sistematizado en el presente artículo con un enfoque hermenéutico crítico fundamentado en métodos cualitativos.
The effect of ph on aniline removal from water using hydrophobic and ion-exchange membranes
(2025-02-14) Filian, Karla; Mendez-Ruiz, Jonathan; Garces, Daniel; Reveychuk, Kateryna; Ma, Lingshan; Melendez, Jesus R.; Díaz-Mendoza, Claudia; Cornelissen, Emile; Valverde-Armas, Priscila; Gutierrez, Leonardo
The presence of aniline, a toxic aromatic amine, has been recorded in different industrial wastewaters. This study aims to investigate the transport of charged and neutral aniline species in aqueous solutions through hydrophobic and ion-exchange membranes (IEMs). Hydrophobic polyoctylmethylsiloxane (POMS) and polydimethylsiloxane (PDMS) membranes and cationic (CEMs) and anionic (AEMs) exchange membranes were tested using diffusion cells and electrodialysis (ED). Diffusion experiments showed that neutral aniline removal reached 90% with POMS and 100% with PDMS due to the concentration gradient between feed (pH = 10) and receiving (pH = 3) solutions. For IEMs, neutral aniline exhibited a faster transport than charged species, with neutral-to-charged transport ratios of 6.6:1 for AEMs and 3.2:1 for CEMs, type I. During ED experiments, an external electric potential increased the charged aniline transport, achieving higher initial fluxes (124.7 mmol·m2·h−1 at pH 4) compared to neutral aniline (43.6 and 53.2 mmol·m2·h−1 for AEMs and CEMs, type I). ED also demonstrated that charged aniline can be removed up to 97% using IEMs. These findings demonstrate the effectiveness of hydrophobic and IEMs in removing aniline, providing insights into its transport mechanism, contributing to the optimization of membrane technologies in treating industrial wastewater effluents, and environmental sustainability.