Poli[Papers] (Universitat Politècnica de València)
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Implementation of condition-based maintenance (CBM) with FMEA approach to improve productivity of the auto insert machine in electronic component manufacturing
Get PDFThis study explores the implementation of Condition-Based Maintenance (CBM) integrated with Failure Mode and Effects Analysis (FMEA) on the Auto Insert Connectors FFC machine, a critical asset in the assembly process of Flexible Flat Cable (FFC) connectors within the electronic components manufacturing industry. The machine plays an essential role in ensuring precision and consistency during the insertion of connector materials, making its reliability a key factor in overall production efficiency. The primary objective of this research is to optimize the maintenance process by transitioning from a preventive maintenance approach to a condition-based strategy utilizing real-time sensors and monitoring systems. FMEA was employed to identify critical failure modes and calculate Risk Priority Numbers (RPNs) for key machine components, which guided the strategic installation of sensors for continuous performance monitoring. Compared to conventional preventive maintenance methods, the implementation of CBM resulted in a 69.75% reduction in inspection time, indicating a substantial improvement in maintenance efficiency. The findings conclude that integrating CBM with real-time data and FMEA significantly enhances operational productivity and minimizes machine downtime. This approach demonstrates strong potential for broader application across various high-precision industries, particularly electronics, automotive, and mining, where equipment reliability is essential to maintaining competitiveness
Mesobiliverdin IXα-enriched microalgal feed supplement promotes beneficial gut microbiota in rabbits
Get PDFStudies were conducted to determine if an antibiotic-free diet supplemented with mesobiliverdin IXα-enriched microalgae extract promotes beneficial gut microbiota in 4- to 6-wk-old New Zealand White rabbits. Mesobiliverdin IXα is a cytoprotective haem-derived bilin with anti-inflammatory and antioxidant properties. Rabbits given supplemented feed had body weight gains, lower serum cytokine IL-6 levels and similar blood chemistry profiles compared to rabbits provided control non-supplemented feed. Microbiota 16s genomic analyses of caecotropes revealed that supplemented feed elicited caecal microbiota relative abundance increases of genera Family_XIII_AD3011 and Papillibacter, Bacteriodes vulgatus and families Lachnospiraceae, Akkermansiaceae and Bacteriodaceae and lower abundance of genera Anaeroplasma, Monoglobus, Tyzerella, Eubacterium ventriosum group and Eubacterium rumenatium group compared to non-supplemented feed. The caecal microbiota profile of rabbits fed supplemented feed resembles that described for rabbits treated with the anti-inflammatory anthocyanin procyanidin B2 and the analgesic meloxicam and shows less resemblance to the previously reported profiles of rabbits provided feed supplemented with antibiotics
Nutritional evaluation of two composite linseed-based ingredients for growing rabbits
Get PDFThe digestible energy and protein content of two novel linseed-based ingredients were measured in growing rabbits: a high-fat extruded linseed meal cooked (ELM) and a mixture (70:30) of high-fat linseed chaff and wheat flour (LCW). Digestible energy (DE, MJ/kg of dry matter - DM) and digestible protein (DP, g/kg DM) values were obtained from regression analysis with three dietary incorporation levels of ELM or LCW: a basal diet (0%) and two diets with 8 or 16% of ELM or LCW, respectively. The regression curves were obtained from data collected in a faecal digestibility trial (n=10 rabbits per diet, 1:1 sex ratio, 42 to 46 d old) fed at two levels of inclusion (80 or 160 g/kg DM) of each ingredient in a basal diet formulated for growing rabbits (substitution method). The regression coefficients for DE (DE=10.4+0.003×ELW) and DP (DP=145.4+0.103×ELW) obtained for the ELM were significant (P<0.001). The estimated DE and DP values for the ELM were: 13.7±0.81 MJ/kg DM and 248.6±11.4 g/kg DM. The regression coefficient for DE (DE=10.4+0.011×LCW) for the LCW was significant (P<0.001), for an estimated DE content of 20.8±0.9 MJ/kg DM. The regression coefficient for DP (DP=145.6+0.011×LCW) for the LCW was not different from zero (P=0.09), giving an estimated DP of 166.9±11.3 g/kg DM. The ELM seems to be an adequate protein source for growing rabbits. The LCW appear to be an interesting composite ingredient. It provides moderate amounts of fibre fractions in addition to energy. Moreover, both ingredients contain high levels of C18:3 omega-3 fatty acids (ELM: 34.5 and LCW: 52.9 g/kg DM). These ingredients should be included up to 10% in feed formula. Based on their characteristics, these novel ingredients may improve the feed quality of growing rabbits
Desarrollo de un robot de bajo costo para aplicaciones agrícolas
Get PDFNowadays, robotics allows us to improve the efficiency of processes and the quality of products. However, the high cost of this type of technology is often inaccessible to small or medium-sized industries, especially in developing countries, such as Peru. In this work, a robot is developed as a low-cost alternative to promote automation in sectors where specialized human resources are insufficient, for example, agroindustry. The design and construction of the mechanical structure of the robot is a combination of additive and conventional manufacturing. The actuator system uses BLDC motors, control card, harmonic reducers, belts and pulleys of low-cost. The kinematic, dynamic, and trajectory planning model of the robot was developed and embedded on a microprocessor card Teensy 4.1. The performance of the robot is evaluated under nominal load in a work environment similar to a real one, validating its performance in precision, repeatability, and production. En general, la robótica ha permitido mejorar la eficiencia de los procesos y la calidad de sus productos. Sin embargo, el alto costo de este tipo de tecnologías muchas veces es inaccesible para las pequeñas y medianas industrias de países en vías de desarrollo, como el Perú. En este trabajo se desarrolla un robot como una alternativa de bajo costo para impulsar la automatización en el sector agroindustrial donde el recurso humano especializado es escaso. El diseño y construcción de la estructura mecánica del robot es una combinación entre manufactura aditiva y convencional. El sistema actuador usa motores BLDC, tarjetas de control, reductores armónicos, fajas y poleas de bajo costo. El modelo cinemático, dinámico y planificación de trayectorias del robot fue desarrollado e implementado de forma embebida en una tarjeta procesadora Teensy 4.1. El desempeño del robot se evalúa bajo carga nominal en un entorno de trabajo similar a uno real, validando su performance en precisión, repetibilidad y producción
Some innovative results for interpolative Kannan type and Reich-Rus-Ćirić type cyclic contractions
Get PDFIn this manuscript, we present innovative findings on the existence and uniqueness of fixed points for cyclic mappings. Our discussion covers results for interpolative Kannan-type cyclic contractions in two cases: when the sum of the interpolative exponents is less than one and when it is greater than one. Additionally, we provide results for interpolative Reich-Rus-Ćirić cyclic contractions specifically for cases where the sum of the interpolative exponents is greater than one. Furthermore, we verify our results with suitable examples. Our results are new and complement some results in the literature
Enriched rational type contractions in quasi-Banach spaces and generalized convex b-metric spaces
Get PDFIn this paper, we define enriched rational type contraction in the setting of quasi-Banach spaces and prove the existence and uniqueness of fixed point of the enriched contraction by using Krasnselskii iteration procedure. Morever, we introduce weak enriched rational type contraction and give some fixed point theorems related to Kirk's iteration method. We also give the notion of generalized convex b-metric space and extend the results for quasi-Banach spaces to the concept of generalized convex b-metric spaces. Moreover some examples to support our results are also given
Colaboración y autonomía creativa: IA en el proceso de creación en arte y diseño
Get PDFThis article investigates the role of Artificial Intelligence (AI) as a collaborator in the creative process in art and design, especially in computational generative creation. With the advancement in the complexity of AI tools, the possibility of machine-human co-authorship arises, where the code actively participates in creative decisions and directly impacts the result. We explore how AI and programming tools can act beyond technical support, taking on a more autonomous role and offering new paths for creation. The study also considers ChatGPT as an auxiliary tool for learning and solving problems in creative programming, highlighting its potential and limitations. It is important to highlight that Artificial Intelligence will be used during the process of developing and editing programming codes and not as an image creation agent itself. Therefore, important questions about the appropriation of artists' images and identities by AI will be discussed at another time. The research, developed in the Postgraduate Program in Design at Anhembi Morumbi University seeks to expand understanding of the relationships between art, technology and creative autonomy, contributing to the interdisciplinary debate in the field of contemporary design.Este artículo investiga el papel de la Inteligencia Artificial (IA) como colaboradora en el proceso creativo en arte y diseño, especialmente en la creación generativa computacional. Con el avance en la complejidad de las herramientas de IA, surge la posibilidad de una coautoría máquina-humano, en la que el código participa activamente en las decisiones creativas y repercute directamente en el resultado. Exploramos cómo la IA y las herramientas de programación pueden actuar más allá del soporte técnico, asumiendo un papel más autónomo y ofreciendo nuevas vías para la creación. El estudio también considera ChatGPT como una herramienta auxiliar para el aprendizaje y la resolución de problemas en la programación creativa, destacando su potencial y sus limitaciones. Es importante destacar que la Inteligencia Artificial será utilizada durante el proceso de desarrollo y edición de códigos de programación y no como un agente de creación de imágenes en sí mismo. Por lo tanto, las cuestiones importantes sobre la apropiación de imágenes e identidades de artistas por parte de la IA se discutirán en otro momento. La investigación, desarrollada en el Programa de Postgrado en Diseño de la Universidad Anhembi Morumbi, pretende ampliar la comprensión de las relaciones entre arte, tecnología y autonomía creativa, contribuyendo al debate interdisciplinar en el campo del diseño contemporáneo
Microplásticos en SUDS maduros: evaluación del almacenamiento en suelo y su vínculo con plásticos de mayor tamaño
Get PDFUrban runoff is recognized as a significant source of microplastic (MP) pollution, posing serious environmental threats. This study analyzes the presence of MPs and macroplastics (MAPs) in two vegetated swales in Xàtiva, Spain, constructed over a decade ago. Sampling was conducted in three sections of each swale to evaluate MP retention in the soil. A total of 3500 MPs and 1200 MAPs were identified, with an average concentration of 150 MPs per kg of soil, demonstrating variability among sampling points. The results indicate that the presence of MPs correlates with the quantity of MAPs, suggesting that Sustainable Urban Drainage Systems (SUDS) can effectively retain plastics of varying sizes. The conclusions indicate that SUDS are effective in the accumulation of MPs and MAPs, underscoring the relevance of this retention for managing plastic pollution in urban environments.El presente trabajo analiza la acumulación de microplásticos (MPs) en Sistemas Urbanos de Drenaje Sostenible (SUDS) maduros en Xàtiva, Valencia, con el objetivo de evaluar su capacidad de retención en el suelo y su relación con plásticos de mayor tamaño (MAPs). Se realizaron muestreos en tres secciones de dos cunetas vegetadas, donde se identificaron un total de 3500 MPs y 1200 MAPs, evidenciando una concentración media de 150 MPs por kg de suelo. Se observaron variaciones en la concentración de MPs entre los puntos de muestreo, indicando un rango de 120 a 185 MPs por kg. Esta variabilidad se relaciona con la presencia de MAPs, sugiriendo que los SUDS son efectivos en la retención de plásticos de diferentes tamaños. Las conclusiones indican que los SUDS son efectivos en la acumulación de MPs y MAPs, subrayando la relevancia de esta retención para la gestión de la contaminación plástica en entornos urbanos