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Impact of cold chain temperature and relative humidity variability on cherry tomato shelf life: A predictive modeling approach
Get PDFFood waste is a major global issue, with fruit and vegetables accounting for a large proportion of postharvest losses. This study quantifies the impact of dynamic temperature and relative humidity (RH) conditions on postharvest quality and shelf life of cherry tomatoes. Key quality attributes (weight loss, decay, color, firmness, pH, and total soluble solids) were monitored under 14 storage scenarios simulating real cold-chain conditions: four constant temperatures (5, 8, 15, and 22 °C), eight variable temperatures, and two transportation scenarios using a controlled climate chamber. From continuous sensor records, interpretable exposure and fluctuation indicators for temperature and RH were derived and, combined with time, they were used as predictors in parsimonious multiple linear regression models, including nonlinear transformations. Our results demonstrated that higher temperatures and larger temperature/RH fluctuations accelerate quality deterioration, thus decreasing shelf life, and highlighted cumulative, irreversible quality losses driven by the dynamics of environmental conditions. A model linking softening to weight loss was also presented. The proposed indicator-based predictive framework enables estimation of quality degradation from recorded environmental histories, facilitating early identification of at-risk batches and optimizing distribution strategies to reduce food waste in the cold chain.This research was funded by the Ministry of Science, Innovation, and Universities (MICIU), with NextGenerationEU funds (PRTR-C17.I1) as part of the AGROALNEXT programme and through the FPU programme (grant number FPU23/00186). Also, it was funded by the Fundación Séneca, with funds from Comunidad Autónoma Región de Murcia (CARM) (https://fseneca.es/agroalnext/), and by the "Prueba de Concepto" programme, with code 22267PDC-23
The groundwater cycle
No full textEducational unit in English on the groundwater cycle, focusing on natural and artificial recharge, discharge processes, and their interaction within the hydrologic system. Includes reading comprehension with ten MCQs, pronunciation of keywords with audio, fill-in-the-blank practice, speaking discussion prompts, and two video-based activities (Darcy’s law and the water cycle) with quizzes and a class debate. Designed for integrated language and science learning
Manufacturing and prototyping
No full textThis English-language learning unit explores manufacturing and prototyping, focusing on the evolution from rapid prototyping to rapid manufacturing and the classification of RP&M processes (additive, subtractive, formative, hybrid). It integrates reading comprehension, vocabulary with pronunciation, audio glossary, cloze activities, speaking and debate prompts, a video-based watching task about ICAMP, and targeted grammar practice on “used to / be used to / get used to,” concluding with a Kahoot review
Blasthole drilling
No full textResource for English for Specific Purposes focused on blasthole drilling. It provides a concise guide to drilling methods (tophammer and COPROD), explains impact energy transfer and equipment components, and contrasts speed, precision, and economy across techniques. Learners practice reading comprehension, keyword pronunciation, vocabulary-in-context, and grammar (gerunds/infinitives; comparing/contrasting). Includes a short explanatory video on COPROD, discussion prompts, and a Kahoot review to consolidate understanding in technical mining and quarrying contexts
Mine power systems
No full textThis English-language resource introduces mine power systems, contrasting historical compressed-air power with modern electrical dominance. It reviews fundamentals of compressed-air and electrical power, components like compressors, receivers, and distribution networks, and typical air-operated machines. The unit includes reading comprehension, pronunciation practice, vocabulary activities, speaking/debate tasks, a focused watching activity on the Cat HW300 Highwall Mining System, and grammar exercises (passive voice; used to/be used to/get used to), concluding with a Kahoot review
Introduction to basics of solar panels or photovoltaics
No full textThis resource introduces the fundamentals of solar photovoltaic technology, explaining how semiconductor materials convert light into electricity and comparing major cell types: crystalline silicon, thin-film (CdTe, CIGS), perovskite, organic, quantum dot, multijunction, and CPV. It includes reading comprehension, vocabulary with pronunciations, sentence completion, speaking prompts, videos with quizzes, grammar practice on conditionals, and a Kahoot review to reinforce understanding and application
Influence of GMAW welding parameters on grain size, precipitates, and hardness in alloy 6063-T5
No full textThis article presents a study on the influence of welding parameters, such as power (W), current (A), and weld bevel spacing (mm), on the grain size of the weld bead, the size of the precipitates measured using a SEM microscope, and the hardness measured in the weld bead. The experiments were conducted using the orthogonal Taguchi methodology with an L9 design, meaning 9 experiments. The objective of the optimization is to determine the most suitable values to achieve the best mechanical properties in the welded joint. Power is the variable with the greatest weight and should be kept as low as possible. Bevel spacing is the next most significant variable, while welding speed is the variable with the least weight and should be kept as high as possible. As a practical application, this paper highlights the influence of welding parameters on precipitates and how these relate to hardness, making this a reference parameter for mechanical properties
MdG-01-Acceso abierto a publicaciones
No full textUnidad didáctica introductoria sobre el acceso abierto a publicaciones científicas. Explica su relación con la ciencia abierta, antecedentes, beneficios y las dos vías principales (verde y dorada). Detalla tipos de repositorios, políticas editoriales, embargos y licencias Creative Commons. Incluye tipologías de revistas (gold, híbridas, diamante) y mitos comunes. Contiene infografía y actividades de autoevaluación para consolidar conceptos y prácticas recomendadas
Modeling and analysis of a center-hinge geared rotary actuator
Get PDFLos actuadores rotatorios son dispositivos mecánicos cuya función es extraer la energía de la electricidad o de un fluido a presión elevada y convertirla en un movimiento angular para producir un par de salida con un fin determinado. Se encuentran en multitud de ámbitos industriales, como pueden ser la industria automotriz, robótica o aeroespacial entre otras. Existen diferentes tipos, los cuales abarcan desde aquellos que son accionados por un motor eléctrico con un reductor de engranajes a la salida, hasta aquellos que son accionados por cilindros neumáticos. El objetivo principal que se plantea en este Trabajo Fin de Máster es el de modelar con ayuda de SolidWorks y una impresora 3D un GRA cuyos datos de diseño serán conocidos, y analizar aspectos del montaje, la cinemática y la fiabilidad del mismo.Escuela Técnica Superior de Ingeniería IndustrialUniversidad Politécnica de Cartagen
MdG-05-Publicar en acceso abierto: vía dorada o de revistas
No full textUnidad formativa para PDI sobre la vía dorada del acceso abierto: conceptos, tipologías de revistas (gold, diamante, híbridas), artículos bronce, APC y su financiación, acuerdos transformativos, y cómo localizar revistas abiertas mediante DOAJ, Web of Science, Scopus, JCR y SJR. Incluye estrategias legales y de financiadores, detección de revistas depredadoras, actividades de autoevaluación, resumen y ruta de aprendizaje recomendada