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( Juan C. Gutierrez Fernandez ),( Claudia I. Garcia ) 호남수학회 2016 호남수학학술지 Vol.38 No.2
In a paper of S. H. Choi [2], the author studied the derivations of a restricted Weyl Type non-associative algebra, and determined a 1-dimensional vector space of derivations. We de- scribe all the derivations of this algebra and prove that they form a 3-dimensional Lie algebra.
Lazze, Maria Claudia,Pizzala, Roberto,Pecharroman, Francisco Javier Gutierrez,Garnica, Paloma Gaton,Rodriguez, Juan Manuel Antolin,Fabris, Nicola,Bianchi, Livia The Korean Society of Food Science and Nutrition 2009 Journal of medicinal food Vol.12 No.3
Grape waste management is one of the main problems of winery industries, but, conversely, grape waste contains a high amount of polyphenols that might protect against human diseases related to oxidative stress, such as colorectal cancer. Therefore, the aim of this work was to investigate the antioxidant and antiproliferative activities of a grape waste extract obtained by supercritical fluid extraction. Because the beneficial effect of grape is related to its content of polyphenolic molecules, the extract was chemically characterized by high-performance liquid chromatography in order to assess its major bioactive components. The antioxidant activity of the grape extract was determined. The results showed that the grape extract presents a strong antiradical activity in the in vitro 2,2-diphenyl-1-picrylhydrazyl radical assay and protects against reactive oxygen species production in human colon adenocarcinoma cells (Caco-2). In contrast, the extract did not protect in the citronellal thermooxidation system and showed a weak protective action against lipid peroxidation in Caco-2 cells. The clonogenic assay and the cell cycle distribution analysis showed that the grape extract has a significant antiproliferative effect in a tumor cell line. These data indicate that grape extract is a promising product to be used as an anti-free radical agent and could exert a chemopreventive action.
Fernandez, Juan C. Gutierrez,Garcia, Claudia I. The Honam Mathematical Society 2016 호남수학학술지 Vol.38 No.2
In a paper of S. H. Choi [2], the author studied the derivations of a restricted Weyl Type non-associative algebra, and determined a 1-dimensional vector space of derivations. We describe all the derivations of this algebra and prove that they form a 3-dimensional Lie algebra.
Improvement of dynamic response in an impact absorber by frictional elements
Jorge Bedolla,Dariusz Szwedowicz,Juan Jiménez,Tadeusz Majewski,Claudia Cortés,Enrique S. Gutierrez-Wing 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.4
A novel device that uses friction between one or more pairs of elastic conical rings to dissipate the energy from an impacting body ispresented. The device consists of one moving and one stationary cylinders coupled to each other using two pairs of conical rings and aspring. The spring is used to restore the system to its original configuration after the impact. The dynamic response of the system to theimpact forces during impact events is analysed numerically and experimentally. The effects of several governing parameters, such as themass ratio between the cylinders, the duration of the transient response of the device, the magnitude of the rest zone of the moving elementand the peak impact force are investigated. The proposed system is applicable in sequential impact scenarios, in which remarkableimprovements were observed over traditional solid-rod impact absorbers. The present study may serve as a guide for the design of improveddamping devices for impact applications.