Utilization of surgical trepan for the obtainment of calvarial autogenous bone graft in maxillary reconstructions

Maxillomandibular reconstructions are traditionally performed by means of autogenous bone grafts collected from intraoral donor areas and extraoral donor areas such as clavicle, iliac bone, rib, and tibia. The calvarial bone has been studied as an alternative donor area, with a low incidence of complications and minimal postoperative morbidity. Complications such as dural lacerations associated with cerebrospinal fluid leakage and extradural and subdural bleeding were minimized due to the use of surgical trepan, allowing the diploic layer delimitation before the osteotomy, preserving the internal calvarial cortical. The purpose of this article is to suggest a new technique for the obtainment of calvarial bone grafts with surgical trepan.

Desafíos e innovaciones en la gestión ambiental: actas del Seminario Internacional Experiencia Latinoamericana en Manejo Ambiental"

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Calidad del aire y su impacto en la salud en América Latina y el Caribe

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Calidad del aire en Santiago de Chile, su evolución y algunos lineamientos para su control

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Situación actual y tendencias de la calidad del aire en México

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Residuos industriales, la experiencia de Brasil

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Residuos industriales sólidos en la región metropolitana de Santiago

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Diagnóstico y gestión de descargas de residuos industriales líquidos en la región metropolitana de Santiago

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Gestión de los residuos peligrosos en México

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Efficiency analysis of an isolated high voltage gain converter operating in resonant and non-resonant mode

This paper presents an efficiency investigation of an isolated high step-up ratio dc-dc converter aimed to be used for energy processing from low-voltage high-current energy sources, like batteries, photovoltaic modules or fuel-cells. The considered converter consists of an interleaved active clamp flyback topology combined with a voltage multiplier at the transformer secondary side capable of two different operating modes, i.e. resonant and non-resonant according to the design of the output capacitors. The main goal of this paper is to compare these two operating modes from the component losses point of view with the aim of maximize the overall converter efficiency. The approach is based on losses prediction using steady-state theoretical models (designed in Mathcad environment), taking into account both conduction and switching losses. The models are compared with steady-state simulations and experimental results considering different operating modes to validate the approach. © 2012 IEEE.