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Avelar Alan Matias,de Camargo Fábio,da Silva Vanessa Sanches Pereira,Giovedi Claudia,Abe Alfredo,Mourão Marcelo Breda 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.1
This study investigates the high temperature oxidation behaviour of a Nie20Cr-1.2Si (wt.%) alloy in steam from 1200 C to 1350 C by Thermogravimetric Analysis (TGA), Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Spectroscopy (EDS) and X-ray Diffraction (XRD). The results demonstrate that exposed Ni-based alloy developed a thin oxide scale, consisted mainly of Cr2O3. The oxidation kinetics obtained from the experimental results was applied to evaluate the hydrogen generation considering a simplified reactor core model with different cladding alloys following an unmitigated Loss- Of-Coolant Accident (LOCA) scenario in a hypothetical Small Modular Reactor (SMR). Overall, experimental data and simulations results show that both Fe-based and Ni-based alloys may enhance cladding survivability, delaying its melting, as well as reducing hydrogen generation under accident conditions compared to Zr-based alloys. However, a substantial neutron absorption occurs when Ni-based alloys are used as cladding for current uranium-dioxide fuel systems, even when compared to Fe-based alloys.
Joao Avelar Lobato 한국라틴아메리카학회 2012 라틴아메리카연구 Vol.25 No.3
This article takes an angle on Amado"s novel Tenda dos Milagres, focusing on one aspect: a comparison of the representation of Western and non-Western knowledge. The analysis includes the way in which Amado addresses the "double bind" identified by Mignolo, that is, the dilemma of whether to consider non-Western cultural practices as essentially different or similar to Western ones, and thereby either to exclude them from academic study or to assimilate them too easily and negate difference.
Effects of nonlinear friction compensation in the inertia wheel pendulum
Carlos Aguilar-Avelar,Ricardo Rodríguez-Calderón,Sergio Puga-Guzmán,Javier Moreno-Valenzuela 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.9
This paper discusses for the first time the effects of modeling, identifying and compensating nonlinear friction for the control of the inertia wheel pendulum and proposes a new algorithm for the stabilization of the pendulum at the upward unstable position. First, it is shown that the dynamic model with the proposed asymmetric Coulomb friction component characterizes better the real experimental platform of the system. Then, a feedback linearization based controller with friction compensation was designed, where theoretical results show the stability of the output trajectories. Finally, the new algorithm was experimentally compared with its version without friction compensation, showing that the new scheme yields better performance with less power consumption.
Subasish Das,Anandi Dutta,Raul Avelar,Karen Dixon,Xiaoduan Sun,Mohammad Jalayer 서울시립대학교 도시과학연구원 2019 도시과학국제저널 Vol.23 No.1
In 2011, 4,432 pedestrians were killed (14% of total traffic crash fatalities), and 69,000 pedestrians were injured in vehicle-pedestrian crashes in the United States. Particularly in Louisiana, vehicle-pedestrian crashes have become a key concern because of the high percentage of fatalities in recent years. In 2012, pedestrians were accounted for 17% of all fatalities due to traffic crashes in Louisiana. Alcohol was involved in nearly 44% of these fatalities. This research utilized ‘a priori’ algorithm of supervised association mining technique to discover patterns from the vehicle-pedestrian crash database. By using association rules mining, this study aims to discover vehicle-pedestrian crash patterns using eight years of Louisiana crash data (2004–2011). The results indicated that roadway lighting at night helped in alleviating pedestrian crash severity. In addition, a few groups of interest were identified from this study: male pedestrians’ greater propensity towards severe and fatal crashes, younger female drivers (15–24) being more crash-prone than other age groups, vulnerable impaired pedestrians even on roadways with lighting at night, middle-aged male pedestrians (35–54) being inclined towards crash occurrence, and dominance of single vehicle crashes. Based on the recognized patterns, this study recommends several countermeasures to alleviate the safety concerns. The findings of this study will help traffic safety professionals in understanding significant patterns and relevant countermeasures to raise awareness and improvements for the potential decrease of pedestrian crashes.
Physiological adaptations induced by swimming in mice fed a high fat diet
Pedro Augusto Silva Nogueira,Miriam Pimenta Pereira,Jeferson José Gomes Soares,Anderson Ferraz Norton Filho,Izadora Mayumi Fujinami Tanimoto,Ivana Alice Teixeira Fonseca,Homero Oliveira Avelar,Francoi 한국운동재활학회 2017 JER Vol.13 No.3
This study examined physiological variables of animals fed with a high-fat diet (HFD) or with a normal diet (ND) subjected to swimming at low and moderate level. Over 16 weeks, a group of animals was fed with HFD or ND, and at the 8 weeks, they started swimming with 50% or 80% of the maximum load achieved in the progressive work test. Weekly, body weight and the amount of ingested food were registered. The gly-cemic level was measured at the beginning, middle and at the end of the experiment. Adipose tissue, gastrocnemius muscles and hearts were collected for morphometry. The results showed that the animals fed an HFD had a minor caloric intake; however, the HFD increased body weight and adiposity, likely causing cardiac hypertrophy and an increase in the glycemic level. In this context, swimming with an 80% load contributed positively to weight control, adiposity, glycemic level, to control cardiac hypertrophy and induce hypertrophy in the gastroc-nemius muscle. All parameters assessed showed better results for the ND animals. Therefore, the importance of fat consumption was empha-sized in relation to obesity onset. The practice of swimming with an 80% load produced greater benefits than swimming with a 50% load for overweight treatment.