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Articles 1 - 5 of 5
Full-Text Articles in Mechanical Engineering
Adding Autonomic Healing Capabilities To Polyethylene Oxide, Dorina M. Chipara, Maritza Flores, Alma Perez, Nancy Puente, Karen Lozano, Mircea Chipara
Adding Autonomic Healing Capabilities To Polyethylene Oxide, Dorina M. Chipara, Maritza Flores, Alma Perez, Nancy Puente, Karen Lozano, Mircea Chipara
Mechanical Engineering Faculty Publications and Presentations
The addition of autonomic healing (frequently defined as self-healing) capabilities to a water-soluble polymer (polyethylene oxide, PEO) is for the first time reported. The self-healing system consists of urea-formaldehyde microcapsules filled with dicyclopentadiene and first-generation Grubbs catalyst, dispersed within polyethylene oxide. Raman spectroscopy, optical microscopy, electron microscopy, and thermogravimetric analysis were used to characterize this autonomic healing system. Self-healing capabilities were confirmed by mechanical testing (load–displacement, engineering stress–engineering strain, and true stress–true strain dependences) recorded at very slow elongation rates (0.01 mm/s). The testing fate was chosen to allow for the complete consumption of the monomer before fracture (the polymerization …
Metodología Para La Aplicación De Un Plan De Mantenimiento Centrado En La Confiabilidad Con Criterios De Administración De Energía En Equipos De Aire Acondicionado Tipo Compacto, A. Zambrano, J. Zambrano, Nelson Fumo
Metodología Para La Aplicación De Un Plan De Mantenimiento Centrado En La Confiabilidad Con Criterios De Administración De Energía En Equipos De Aire Acondicionado Tipo Compacto, A. Zambrano, J. Zambrano, Nelson Fumo
Mechanical Engineering Faculty Publications and Presentations
A través del tiempo han evolucionado filosofías con procedimientos muy diferentes con intereses que pueden llegar a ser comunes en cuanto a su objetivo terminal, es así como se presenta la administración de energía y el mantenimiento centrado en la confiabilidad. Estas teorías buscan en común el adecuado funcionamiento de los sistemas, lograr un uso sostenible con el ambiente a través de un estudio detallado de la causas y efectos de los problemas y averías presentadas. La propuesta presentada constituye un punto intermedio entre ambas filosofías donde se indica la afectación que puede presentar el mal funcionamiento de un equipo …
Development And Testing Of An Actively Adjustable Stiffness Mechanism, Eleazar Marquez, Robert Freeman, Horacio Vasquez
Development And Testing Of An Actively Adjustable Stiffness Mechanism, Eleazar Marquez, Robert Freeman, Horacio Vasquez
Mechanical Engineering Faculty Publications and Presentations
This study presents the comparison of the theoretical and experimental results of the performance of an adjustable stiffness mechanism. In particular, the use of redundant actuation is emphasized in the design of a one degree-of-freedom Watt II mechanism capable of independently controlling the effective stiffness without a change in equilibrium position. This approach is in contrast to spring mechanism designs unable to actively control the spring rate independent of deflection, and with potential applications in various types of suspension and assembly systems. Results indicate that two direct drive brush-type direct current motors are required to drive the redundantly actuated mechanism …
Propuesta De Implementación De Energía Solar Fotovoltaica En Instalaciones Pesqueras En Venezuela, Juan Zambrano, Aleyani Zambrano, Buitrago Franklin, Nelson Fumo
Propuesta De Implementación De Energía Solar Fotovoltaica En Instalaciones Pesqueras En Venezuela, Juan Zambrano, Aleyani Zambrano, Buitrago Franklin, Nelson Fumo
Mechanical Engineering Faculty Publications and Presentations
Los sistemas de obtención de energía por medios renovables han venido creciendo de manera interesante en los últimos años debido a los altos precios de la energía y a la limitada disponibilidad del recurso, en el caso de los sistemas de energía solar fotovoltaica (FV), a nivel mundial se ha demostrado gran potencial en proyectos de electrificación rural para aplicaciones domésticas y labores agropecuarias. Venezuela por su posición geográfica privilegiada, cuenta con un gran potencial energético solar, se tiene garantizado un 85% de la incidencia solar estable durante todo el día, incluso en períodos de verano se alcanzan hasta 8 …
Electrospun Carbon Nanofibers Decorated With Various Amounts Of Electrochemically-Inert Nickel Nanoparticles For Use As High-Performance Energy Storage Materials, Liwen Ji, Zhan Lin, Mataz Alcoutlabi, Ozan Toprakci, Yingfang Yao, Guanjie Xu, Shuli Li, Xiangwu Zhang
Electrospun Carbon Nanofibers Decorated With Various Amounts Of Electrochemically-Inert Nickel Nanoparticles For Use As High-Performance Energy Storage Materials, Liwen Ji, Zhan Lin, Mataz Alcoutlabi, Ozan Toprakci, Yingfang Yao, Guanjie Xu, Shuli Li, Xiangwu Zhang
Mechanical Engineering Faculty Publications and Presentations
Carbon nanofibers decorated with various amounts of electrochemically-inert metallic nickel nanoparticles are synthesized through electrospinning and carbonization processes. The morphology and composition of Ni nanoparticles in carbon nanofibers are controlled by preparing different nanofiber precursors. The lithium-ion battery performance evaluations indicated that the content of electrochemically-inert Ni nanoparticles in carbon nanofibers has a great influence on the final electrochemical performance. For example, at certain Ni contents, these composite nanofibers display excellent electrochemical performance, such as high reversible capacities, good capacity retention, and excellent rate performance, when directly used as binder-free anodes for rechargeable lithium-ion batteries. However, when the Ni content …