Communities in PRCR
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- Colecciones de la Albizu University
- Colecciones digitales de Atenas College
- Colecciones de los Centros Sor Isolina Ferré
- Materiales utilizados para la certificación.
Recent Submissions
Effect of equine activities on the physical and mental performance of the rider
(Polytechnic University of Puerto Rico, 2026-09-10) Franco Negrón, Paola C.; Bravo Pérez, Ricardo J.; Bravo Pérez, Ricardo J.
Equestrian riding requires continuous physical and cognitive adaptation to the horse’s movement. Variations in horse gait may affect cardiovascular demand, metabolic effort, stress, and concentration. Previous research identified the need for additional validation, more experimental trials, and further evaluation of cognitive performance. This study expands that work by comparing rider physiologic and mental responses during different equine gaits and experience levels of two cases o riders. Results tend to show that physiological demands rise with intensity of the equine activity, diagonal horses require more physical but less mental demands than lateral horses and that the greater the rider's experience, the less physical and mental effort they exert. An increase in subjects and horses is needed for further studies.
Social Media Scanning for Crisis Management
(Polytechnic University of Puerto Rico, 2026-09-10) Martínez Lamela, Morgan; Brennes Catinchi, Joanne; Pacheco Crosetti, Gustavo E.; Brennes Catinchi, Joanne; Pacheco Crosetti, Gustavo E.
Hurricane Maria exposed critical gaps in Puerto Rico's emergency response infrastructure. This research presents the Social Media Emergency Scanner, a system using NLP and deep learning to automatically detect and classify emergency-related posts from social media. Using the X (Twitter) v2 API, 4,250 bilingual (Spanish/English) posts were collected across multiple disaster years. Over 52% of posts contained actionable emergency information, with post utility improving significantly over time. Dominant emergency types included earthquakes and traffic accidents. A TF-IDF/Logistic Regression classifier was deployed, with BERT-Att-BiLSTM identified as the optimal future model. This tool aims to streamline disaster response coordination in Puerto Rico.
Metabolic & biomechanic performance analysis of human gait at different water levels
(Polytechnic University of Puerto Rico, 2026-09-10) Marco Class, Mariana Isabel; Bravo Pérez, Ricardo J.
; Pacheco Crosetti, Gustavo E.; Bravo Pérez, Ricardo J.
; Pacheco Crosetti, Gustavo E.
Walking is one of the most efficient forms of human locomotion; however, environmental conditions such as flooding alter normal gait mechanics by increasing drag forces, reducing stability, and requiring greater muscular effort. These biomechanical adaptations increase metabolic demand and reduce locomotor efficiency (Rupcich et al., 2023). Puerto Rico is highly exposed to hurricanes, floods, and tsunami hazards, making it an ideal location to investigate how water depth influences human movement (Puerto Rico Seismic Network, 2025). Understanding these physiological and biomechanical adaptations can improve emergency evacuation strategies and contribute to safer disaster response planning.
Evaluación del Bioetanol como Alternativa a los Combustibles Fósiles Mediante el Aprovechamiento de Desechos Orgánicos
(Universidad Politécnica de Puerto Rico, 2026-09-09) Hernández Meléndez, Heniel J.; Boria Antonsanti, Mali J.; Negrón Ortiz, Ariangelis; Negrón Ortiz, Ariangelis
La creciente dependencia de combustibles fósiles ha impulsado la búsqueda de alternativas renovables que permitan reducir residuos y recuperar el valor energético de la biomasa. En este estudio se evaluó la producción de bioetanol a partir de cáscara de piña y residuos del procesamiento del café mediante hidrólisis ácida, fermentación y destilación sencilla. Las materias primas fueron lavadas, secadas y trituradas, seguidas de hidrólisis con H₂SO₄ al 0.5%, neutralización con NaOH 2 M y ajuste de pH a 4.5–5.5. Posteriormente, las muestras fueron fermentadas con Saccharomyces cerevisiae durante 48–72 h y destiladas a un máximo de 80 °C. La conversión del almidón se evaluó mediante prueba de yodo, mientras que la concentración de alcohol se determinó con un densímetro Anton Paar DMA 35. Los productos destilados fueron caracterizados mediante FTIR y comparados con un estándar comercial de etanol. La piña alcanzó 3.8% w/w de alcohol, mientras que el café obtuvo 2.4% w/w. El análisis FTIR mostró grupos funcionales característicos de alcoholes y una mayor similitud de la muestra de piña con el estándar. Estos resultados respaldan el potencial de estos residuos como materias primas renovables para la producción de bioetanol y su valorización dentro de un modelo de economía circular.
The effect of lumen output and electromagnetic radiation in an indoor environment
(Polytechnic University of Puerto Rico, 2026-09-10) Ortíz Castillo, Fabiola T.; Pastor Carattini, Joncy; Torres Vélez, Wilfredo; Torres Vélez, Wilfredo
This study evaluates illuminance, electromagnetic radiation, and flicker characteristics of lighting systems across several indoor spaces at the Polytechnic University of Puerto Rico, including classrooms P-315, L-301, CTE-5, a library cubicle, and the gymnasium. Results indicate significant variability: some spaces had insufficient or nonuniform illumination, others exceed recommended lumen levels, and most exhibit acceptable flicker ranges, with a few showing moderate flicker linked to LED driver instability. Based on these findings, recommendations include luminaire repositioning, lamp and filter replacement, and periodic maintenance. This first-phase study contributes to improving lighting quality, visual comfort, energy efficiency, and photobiological safety in educational environments.