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Experimental and numerical study on the detection of fatigue failure in hydraulic turbines
Xavier Sánchez-Botello,Adolfo de la Torre,Rafel Roig,Esteve Jou,Oscar de la Torre,Javier Ayneto,Xavier Escaler 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.10
Detecting fatigue cracks in hydraulic turbine runners is costly, as it requires stopping the unit, emptying it of water and accessing the runner for inspection. Thus, an alternative way based on monitoring the changes of the structural modal response induced by the formation and growth of a crack was investigated. To do so, the crack propagation induced by a resonance was numerically predicted and experimentally machined on a disk-like structure that resembles a Kaplan turbine runner. The analysis of the results shows how the different stages of the fatigue crack growth can be monitored based on the change of the natural frequencies and mode shapes of several specific modes. Based on the obtained results, a structural health monitoring system is being designed to monitor the turbine runner modes of vibration without the need to stop and inspect the unit.
Natural products in the research of cholesterol gallstones
Ibrahim Guillermo Castro-Torres,Minarda De la O-Arciniega,Janeth Gallegos-Estudillo,Mariano Martínez-Vázquez,Elia Brosla Naranjo-Rodríguez,Miguel Ángel Domínguez-Ortíz,Jesús Samuel Cruz-Sánchez 셀메드 세포교정의약학회 2013 TANG Vol.3 No.3
Cholesterol gallstones are a digestive disease of high prevalence that has many risk factors; for this reason, research has focused mainly on how to prevent it rather than how to treat it. Many molecules of the hepatic, bile and intestinal systems are involved in the pathophysiology of this disease, making it very difficult to find a therapeutic target. The pharmacological treatment is limited, so when gallstones generate symptoms, medical treatment indicates gallbladder removal. Ursodeoxycholic acid is used to dissolve cholesterol stones, and ezetimibe and statins are other drugs with possible applications in the treatment of this disease. Given the small number of drugs that have been developed for treating this disease, the research of natural products becomes of paramount importance. Resources such as black radish, glucosinolates, fenugreek, capsaicin, curcumin, garlic, and onion, have all shown significant effects in the prevention and treatment of cholesterol gallstones. In this review, we made a synthesis of the scientific reports that deal with these natural products and that can serve as antecedents for finding a way to treat the most common disease of the gallbladder.
LA INTERCULTURALIDAD EN LA CLASE DE ESPAN~OL LENGUA EXTRANJERA
Torre, Jesu´s de la 한국동서정신과학회 2002 동서정신과학 Vol.5 No.2
Considering the importance of the connection between languages and culture this article examines the necessity for inclusion of an intercultural perspective in the learning process to achieve better results in the foreign language classroom. It becomes even more relevant if we take into account the cultural differences between Korea and the language of study. After recognizing and assessing the relevant factors that take part in learning we chose one of them (Confucianism) as one of the key elements that will help the native teacher to understand the cultural patterns of the students and their learning styles. We stress the importance for the educator to know idiosyncratic behaviours in order to avoid misunderstandings in communication and "cultural shock". This research is oriented for practical applications. For that, we analysed the different interpretations of "the silence in the classroom", in the culture of the Spanish language teacher as compared with the culture of Korean students; that is a conclusive example that the educator should approach the teaching practice bearing in mind the cultural specifics of the students; that means, from an intercultural perspective.
A. Martínez-de la Cruz,S. Obregón Alfaro,Leticia M. Torres-Martínez,I. Juárez Ramírez 한양대학교 세라믹연구소 2008 Journal of Ceramic Processing Research Vol.9 No.5
Bismuth tungstate Bi2W2O9 has been synthesized using diethylenetriaminepentaacetic acid (H5DTPA), an organic chelating agent of metals in an aqueous solution. The formation of the oxide was followed through characterization techniques such as XRD, TGA/DTA, and SEM. The optimum temperature to decompose the organic matrix and to form Bi2W2O9 was determined to be around 720 oC. Below this temperature, Bi2W2O9 was formed with a high content of Bi2WO6. At 720 oC particles of the Bi2W2O9 with a surface area four times higher than that obtained by a solid-state reaction were obtained. The oxide was tested as a photocatalyst on the degradation of aqueous solutions of rhodamine B under VIS radiation. The photodegradation of the dye followed a kinetic first order with an apparent constant, k = 2.8 × 10−3 minute−1and t1/2= 247 minutes for an aqueous solution of 5 mg l−1 of rhodamine B. Bismuth tungstate Bi2W2O9 has been synthesized using diethylenetriaminepentaacetic acid (H5DTPA), an organic chelating agent of metals in an aqueous solution. The formation of the oxide was followed through characterization techniques such as XRD, TGA/DTA, and SEM. The optimum temperature to decompose the organic matrix and to form Bi2W2O9 was determined to be around 720 oC. Below this temperature, Bi2W2O9 was formed with a high content of Bi2WO6. At 720 oC particles of the Bi2W2O9 with a surface area four times higher than that obtained by a solid-state reaction were obtained. The oxide was tested as a photocatalyst on the degradation of aqueous solutions of rhodamine B under VIS radiation. The photodegradation of the dye followed a kinetic first order with an apparent constant, k = 2.8 × 10−3 minute−1and t1/2= 247 minutes for an aqueous solution of 5 mg l−1 of rhodamine B.
Malavasi, N.,Arnouts, S.,Vibert, D.,de la Torre, S.,Moutard, T.,Pichon, C.,Davidzon, I.,Kraljic, K.,Bolzonella, M.,Guzzo, L.,Garilli, B.,Scodeggio, M.,Granett, B. R.,Abbas, U.,Adami, C.,Bottini, D.,Ca Oxford University Press 2017 MONTHLY NOTICES- ROYAL ASTRONOMICAL SOCIETY Vol.465 No.4
<P>We present the first quantitative detection of large-scale filamentary structure at z similar or equal to 0.7 in the large cosmological volume probed by the VIMOS Public Extragalactic Redshift Survey (VIPERS). We use simulations to show the capability of VIPERS to recover robust topological features in the galaxy distribution, in particular the filamentary network. We then investigate how galaxies with different stellar masses and stellar activities are distributed around the filaments, and find a significant segregation, with the most massive or quiescent galaxies being closer to the filament axis than less massive or active galaxies. The signal persists even after downweighting the contribution of peak regions. Our results suggest that massive and quiescent galaxies assemble their stellar mass through successive mergers during their migration along filaments towards the nodes of the cosmic web. On the other hand, low-mass star-forming galaxies prefer the outer edge of filaments, a vorticity-rich region dominated by smooth accretion, as predicted by the recent spin alignment theory. This emphasizes the role of large-scale cosmic flows in shaping galaxy properties.</P>
Galaxy evolution in the metric of the cosmic web
Kraljic, K.,Arnouts, S.,Pichon, C.,Laigle, C.,de la Torre, S.,Vibert, D.,Cadiou, C.,Dubois, Y.,Treyer, M.,Schimd, C.,Codis, S.,de Lapparent, V.,Devriendt, J.,Hwang, H. S.,Le Borgne, D.,Malavasi, N.,Mi Oxford University Press 2018 MONTHLY NOTICES- ROYAL ASTRONOMICAL SOCIETY Vol.474 No.1
Group quenching and galactic conformity at low redshift
Treyer, M,Kraljic, K,Arnouts, S,de la Torre, S,Pichon, C,Dubois, Y,Vibert, D,Milliard, B,Laigle, C,Seibert, M,Brown, M J I,Grootes, M W,Wright, A H,Liske, J,Lara-Lopez, M A,Bland-Hawthorn, J Oxford University Press 2018 MONTHLY NOTICES- ROYAL ASTRONOMICAL SOCIETY Vol.477 No.2
Simulation of the Electrical Resistance Sintering of Hardmetal Powders
Juan Manuel Montes,Francisco J. de la Viña,Íñigo Agote,Thomas Schubert,Francisco G. Cuevas,Yadir Torres,José María Gallardo,Jesús Cintas 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.2
The simulation of the electrical resistance sintering (ERS) of hardmetal powders has been studied. The ERS process canproduce a quick consolidation of electrical conductive powders by the simultaneous application of pressure and electricalcurrent. A model of the process has been developed, integrating three actions, namely, thermal, mechanical and electrical,and taking into account the nature of both the powders and the die where powders are placed. The model has been implementedin COMSOL Multiphysics, a finite element commercial program. This paper deals with the model fundamentals andhardmetal particular aspects, such as modelling properties of mixed powders and its thermal behaviour. Other parameters inthe model have been tuned to optimally fit the initial experimental data. To check simulation results, measurable parametershave been monitored during experimental tests with WC–6 wt% Co. Once the model was completed and put to work, resultsare discussed.
ALTCALC : Electronic Altitude and Distance Calculating Device
J. G. Casia,K. A.,De La Torre,S. E.,Nellas 국제과학영재학회 2017 APEC Youth Scientist Journal Vol.9 No.1
Altitude measurement in fields, forestry and engineering remain essential but still conventional methods of altitude measurement remain challenging. Present altitude measurement methods include height poles for trees and photogrammetric instruments. Both methods remain arduous as either process is both time and money consuming or susceptible to large parallax errors. In this innovative work an altitude and distance calculating device out of potentiometers based on trigonometry was developed. A laser diode was attached to a potentiometer, and the other components were soldered together in a circuit board. Device accuracy and precision was determined. User satisfaction survey was also noted. For the altimeter testing, the lasers were pointed at the top of the object and the device was placed at a 1-meter distance from the base of the object. The device was set to measure different heights from 0.5 m to 2.5m. For the distance sensor, the lasers were pointed at a 1-meter height and the device was set to measure different distances from 0.5m to 2.5m. Three replicates for each trial were performed and device readings were then compared to actual measurements to determine accuracy. Standard deviations of reading were then computed to determine precision. Net Promoter Score was used in order to assess external evaluator feedback. An Arduino based altimeter and distance sensor was successfully fabricated with 94.2 percent degree of accuracy and 95.4 percent precision for height measurement. For the distance sensor, a 91.4% accuracy, and 95.4% precision was determined. The device garnered a net promoter score of 66%.