Browsing Departamentos de Investigación by Description "Trabajo académico"
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ItemFabrication and creep properties of eutectic-composition Al2O3/YAG/YSZ sintered composites(Elsevier Ltd, 2021) Huamán-Mamani, F.A.; Jiménez-Holgado, C.; Jiménez-Melendo, M."Three-phase alumina/YAG/yttria-stabilized cubic zirconia (YSZ) composites were fabricated by a solid-state reaction route starting from commercial powders of Al2O3, Y2O3 and monoclinic ZrO2. The final phases Al2O3, YAG and YSZ were obtained after calcination of the powder mixtures at 1400 °C. Dense bulk composites were obtained after sintering, with a homogeneous microstructure of fine and equiaxed grains with sizes of 1 μm. Compressive mechanical tests were performed at 1300–1450 °C in air at constant load and at constant initial strain rate. A brittle-to-ductile transition was found with increasing temperature. Grain boundary sliding is the main deformation mechanism in the ductile regime, characterized by a stress exponent of 2 and by the absence of dislocation activity and changes in grain morphology. Alumina seems to be the rate-controlling phase owing to the improvement in creep resistance by the presence of yttrium and zirconium of the other two phases." ItemFabrication and evaluation of the mechanical behavior of geopolymer compounds using waste from the mining and construction industry(IOP Publishing Ltd, 2021) Huamán-Mamani, F. A.; Mayta-Ponce, D. L.; Rodríguez-Guillén, G. P.Geopolymers are lately being considered a group of revolutionary materials, due to their good mechanical properties, chemical stability, fire resistance and diversity of applications where they can be used. For the synthesis of geopolymers, a great variety of types of natural and artificial raw materials (residues from other industries) can be used, which allows obtaining materials with very specific applications. Two of the most important industries in Peru are also those that generate greater environmental degradation, mainly due to the waste they generate. The mining industry has a negative impact on the environment, generating a large amount of inorganic waste, while the construction industry does the same, generating large amounts of demolition waste. Both, mining and demolition waste, constitute a serious environmental problem, since currently they are only deposited without any alternative use. Therefore, our research proposes the use of geopolymeric technology for the use of mining and demolition waste in the manufacture of geopolymeric concrete with mechanical strengths similar to that of Portland cement concrete. © 2021 Institute of Physics Publishing. All rights reserved. ItemFabrication, microstructure and high-temperature plastic deformation of three-phase Al2O3/Er3Al5O12/ZrO2 sintered ceramics(Elsevier Ltd, 2021) Huamán-Mamani, F.A.; Jiménez-Holgado, C.; Jiménez-Melendo, M."The fabrication, microstructure and high-temperature creep behavior of chemically compatible, three-phase alumina/erbium aluminum garnet (Er3Al5O12, EAG)/erbia fully-stabilized cubic ZrO2 (ESZ) particulate composites with the ternary eutectic composition is investigated. The composites were fabricated by a solid-state reaction route of α-Al2O3, Er2O3 and monoclinic ZrO2 powders. The final phases α-Al2O3, EAG and ESZ were obtained after calcination of the powder mixtures at 1400 °C. High dense bulk composites were obtained after sintering at 1500 °C in air for 10 h, with a homogeneous microstructure formed by fine and equiaxed grains of the three phases with average sizes of 1 μm. The composites were tested in compression at temperatures between 1250 and 1450 °C in air at constant load and at constant strain rate. As the temperature increases, a gradual brittle-to-ductile transition was found. Extended steady states of deformation were attained without signs of creep damage in the ductile region, characterized by a stress exponent of nearly 2 and by the lack of dislocation activity and modifications in grain size and shape. The main deformation mechanism in steady state is grain boundary sliding, as found in superplastic metals and ceramics. In the semibrittle region, microcavities developed along grain boundaries; these flaws, however, did not grow and coalescence into macrocracks, resulting in a flaw-tolerant material. Alumina is the creep-controlling phase in the composite because of the grain boundary strengthening caused by the (unavoidable) Er3+- and Zr4+-doping provided by the other two phases. © 2021" ItemMechanical characterization of new geopolymeric materials based on mining tailings and rice husk ash(IOP Publishing Ltd, 2021) Huamán-Mamani, F. A.; Mayta-Ponce, D. L.; Rodríguez-Guillén, G. P."This work presents the results of the thermomechanical evaluation of geopolymeric concrete fabricated from mining tailings, rice husk ash and fine sand. Ten types of geopolymeric concrete were studied and the relationship between the initial volumetric concentrations of the components in the mixtures and the maximum resistance in uniaxial compression under conditions of variable temperature (between ambient and 600 ºC) was analyzed. The results revealed that increases in the concentration of mining tailings and fine sand lead to an increase in the value of the maximum mechanical resistance, in contrast, the increase in the concentration of rice husk ash led to a reduction in the value of the maximum mechanical resistance. Furthermore, increases in test temperature, up to 500 °C, led to systematic increases in maximum mechanical strength. Finally, the geopolymeric concretes presented a brittle-ductile transition between 500 and 600 °C showing only a ductile behavior when tested at 600 °C and only brittle up to test temperatures of 500 °C. © 2021 Institute of Physics Publishing. All rights reserved." Item"[The daily violence as a mechanism of social ascent. The case of Arequipa at the end of the viceroyalty. 1784-1824] [La violencia cotidiana como mecanismo de integración y ascenso social. El caso de Arequipa a fines del virreinato. 1784-1824]"(University of Sevilla, 2021) Belan, CésarThis article analyzes the crime of insults framed in Arequipa society at the end of s. XVIII. Using some concepts of the social theory of Erving Goffman seeks study the political rationality behind the insults and the trials derived from them, pointing out how these mechanisms were used as means of social advancement in the city. This article also describes the archetype of citizen in Arequipa, in opposition to the social behaviors mislabeled in the causes of insults. © 2021 University of Sevilla. All rights reserved. ItemThe examination of the virtue of faith for Dante(UNIV GABRIELA MISTRAL, CENTRO ESTUDIOS MEDIEVALESLADISLAO ERRAZURIZ 2073, PROVIDENCIA, SANTIAGO, 00000, CHILE, 2021) Renzi, FabrizioIn canto XXIV of Paradise, Dante is called to answer a series of questions about the virtue of faith. The purpose of this article is - first - to show what is the logical structure that underlies the conception of the Christian belief present in the canto in question, - second - to highlight that the poet's responses are perfectly in line with the reflections of the scholastics (particularly Thomas Aquinas). The fact that Dante distinguishes between the absolute certainty of supernatural faith and the doubt of scientific investigation, can be seen as a rejection of the argumentative doctrine of scholasticism only if the epistemological status that medieval theologians confer on the science of faith is misunderstood. ItemWar and economics in Arequipa: The activities of the Spaniard Lucas de la Cotera in a time of crisis, 1821-1824 [Guerra y economía en Arequipa: Las actividades del Español Lucas de la Cotera en una coyuntura de crisis, 1821-1824](Scopus, 2011) Condori Condori, José VictorThe present article seeks to examine the economic context of a Peruvian city during the War of Independence and explains the positive and negative consequences of that war. By examining notarial and tax records held in regional archives it also seeks to reconstruct the business and political activities of the Spanish trader Lucas de la Cotera, who for various reasons became during this brief period the main financier and supplier of the last vice-regal government in Peru.