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- 저자 : Juan Davila (검색결과 2 건)
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Colmenares, Julio E.,Davila, Juan M.,Shin, Jong-Ho,Vega, Jairo Techno-Press 2018 Geomechanics & engineering Vol.15 No.3
Terrace deposits are often encountered in portal areas and tunnels with low overburden. They are challenging to excavate considering their great mechanical and spatial heterogeneity and a very high stiffness contrast within the ground. Terrace deposits are difficult to characterize, considering that samples for laboratory testing are almost unfeasible to obtain, and laboratory tests may not be representative due to scale effects. This paper presents the approach taken for their characterization during the design stage and their posterior validation performed during construction. Lessons learned from several tunnels excavated on terrace deposits on the Bogota-Villavicencio road (central-east Colombia), suggest that based on numerical simulations, laboratory testing and tunnel system behaviour monitoring, an observational approach allows engineers to optimize the excavation and support methods for the encountered ground conditions, resulting in a more economic and safe construction.
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Antioxidant Capacity of Crude Extracts from Clones of Banana and Plane Species
Antonio J. Rodriguez-Malaver,Elizabeth M. Perez-P?ez,Nayalet Padilla,Gerardo Medina-Ram?ez,Juan Davila 한국식품영양과학회 2006 Journal of medicinal food Vol.9 No.4
Banana and plane are the most important fruits in world trade, behind citric plants. In this work we studiedthe antioxidant capacity of banana and plane varieties of fruits obtained from interspecies crossed varieties of Musa acumi-nataand Musa balbisiana, named Harton plane, Cavendish banana, and Manzano banana. With this purpose we evaluatedbanana and plane crude extracts using the ferrous ion oxidation with xylenol orange method, the thiobarbituric acid method,determination of antioxidant activity, and effect on superoxide anion and hydroxyl radical and the radicals generated by ul-traviolet light. The experiments showed that all extracts have the capacity to decrease the concentrations of lipid hydroper-oxides and malondialdehyde, produced in the lipid peroxidation process, in a manner comparable to that of other widely stud-ied antioxidants like melatonin and vitamin E. Moreover, all extracts had the capacity to inhibit the generation of superoxideanion, hydroxyl radical, and the radicals generated by ultraviolet light. When antioxidant activity was calculated, a value wasfound that was equivalent to a concentration of uric acid between 0.20 and 0.30 mM at the highest concentration of extractused, with uric acid being a potent antioxidant at 1 mM.
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