Sistema Regional de Información
en línea para Revistas Científicas de América Latina,
el Caribe, España y Portugal

The design of this photovoltaic generator responds to the need of a Higher Education Institution to provide electricity without blackouts to a Faculty building of more than 1.200 people. It was necessary to determine the electricity demand priorities of the different units of the Faculty in order to design the 50 kWp solar photovoltaic generation system based on the selected methodology. Based on the knowledge of the irradiance at the site of the photovoltaic project, it was possible to determine the number of solar panels and how they should be arranged in series-parallel arrays for connection to the inverters. The designed system was successfully validated with the use of the PVsyst software. The results achieved were satisfactory, the generation system can be implemented at a reasonable cost and the Faculty can count on an uninterrupted supply of electricity during the hours in which university activities are carried out. The reality of the country makes public and private companies consider the use of photovoltaic solar energy as an alternative to compensate for the energy deficit, either as consumers or suppliers of electrical energy.

Abstract This study explores the use of nanochitin extracted from crab shell waste to enhance the mechanical and durability properties of cement-based mortars. Nanochitin, a biopolymer derived from chitin, has been identified as a promising nanomaterial additive that improves compressive strength, cohesion, and workability of cementitious composites. The methodology involved the synthesis, characterization, and incorporation of nanochitin in mortars using Type N and Type HS cements. The mechanical performance was evaluated through uniaxial compression tests, permeability analysis, and microstructural characterization via Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD). The results indicate that nanochitin enhances hydration, contributing to an optimized cementitious matrix. The modified mortars exhibited higher compressive strength, reaching 9.18 MPa at 90 days in Type N cement. Furthermore, nanochitin demonstrated superior rheological properties, allowing for improved workability and water retention, particularly in arid environments. This study highlights the sustainability benefits of repurposing crab shell waste, aligning with circular economy principles and advancing the development of eco-friendly construction materials.

The LT layer of the P oilfield in Ecuador is in the late stage of depletion development. The main production areas have serious formation energy voidage and the production is declining rapidly. In view of this situation, based on the fine geological modeling constrained by seismic amplitude, a numerical simulation study on water injection for energy supplement was carried out. The water injection mode, water injection rate, injection-production ratio and well pattern optimization were studied by using the existing producer to converting injector. The study shows that injector in the low position has better oil recovery than injector in the high position. The water injection volume of 2000-4000 STB/D can be determined according to the on-site injection situation, and the injection-production ratio is more appropriate to be controlled at about 1. The pilot showed that the average daily injection volume was about 3000 barrels, after 8 months of injection, oil production increased from three surrounding wells. This study provides solid technical theory and practical experience guidance for the next step of expanding water injection to the whole area of the P oilfield.

The present research focused on the design and development of a permeable paver that allows rainwater to filter into the subsoil, thereby reducing the amount of water entering sewer systems and minimizing the impact of urban flooding. The process began with the evaluation of compressive strength and permeability in test cylinders, selecting the most suitable mixtures for subsequent paver fabrication. Once the optimal designs were chosen, key properties such as indirect tensile strength, water absorption, and permeability were assessed. The results showed that by using a high-range water-reducing admixture, indirect tensile strengths of 3.4, 3.9, and 4.5 MPa were achieved, with permeabilities of 2.30, 1.93, and 1.15 mm/s, respectively. These findings demonstrate that the developed pavers successfully meet the mechanical strength requirements necessary for use in interlocking pavements.

Within soil mass, stress generated by the self-weight of the terrain and external loads can affect underground structures such as channels, tunnels, and pipelines. In recent years, the main campus of the Technical University of Manabí, located in Portoviejo, Ecuador, has undergone significant infrastructure expansion, resulting in increased soil pressures that may compromise structural integrity. This study aims to analyze, quantify, and compare the vertical stresses induced in the soil beneath the Faculty of Humanistic and Social Sciences building using two methods: Boussinesq’s equation for rectangular foundations and Newmark’s Influence Chart applicable to any foundation geometry. The building’s foundation consists of continuous footings in two directions, which required adaptation to the rectangular form assumed in Boussinesq’s model. Architectural and structural plans were used to calculate the loads transmitted to the foundation. Vertical stresses were determined at 1-meter intervals from 1 m to 15 m depth. The maximum vertical stress, according to Boussinesq, occurred at 2 meters, whereas Newmark’s method indicated a peak at 1 meter. The comparative analysis revealed a maximum stress difference of 46.21%. This evaluation of vertical stress transmission enables the prediction of potential impacts from structural and adjacent loads on future underground works within the university campus.

En la publicación correspondiente a la edición del artículo "Análisis estadístico de la geoquímica de sedimentos activos tomados en la Cordillera Occidental del Ecuador (1997-1999) y su correlación con los depósitos Cascabel, La Plata y El Domo", en la sección de autoría, por un error involuntario, no se incluyó el nombre de uno de los autores. El listado correcto de los autores es el siguiente: Cristian Nicolás Núñez-MantillaInvestigador privado, Quito, Ecuadorhttps://orcid.org/0009-0002-2220-8497 Danny Santiago Burbano-MorilloUniversidad Central del Ecuador. Quito, Ecuadorhttps://orcid.org/0000-0002-2716-4756 Gerardo Marcelo Llerena-CarreraUniversidad Central del Ecuador. Quito, Ecuadorhttps://orcid.org/0009-0001-5325-4050 John Efraín Bolaños-MoreanoUniversidad Central del Ecuador. Quito, Ecuadorhttps://orcid.org/0009-0004-3815-0992

This work addresses a long-standing topic in Peruvian historiography: the presence of aliens in Peru during the 16th and 17th centuries. It also contributes to an understudied topic: the situation of those interned due to armed conflicts. In this regard, the wreck of the Dutch ship, Flying Deer, in the early 17th century offers a window into the treatment and temporary integration of foreigners in viceregal Peru. Contrary to their expectations, the twenty-three castaways were not treated as pirates or heretics, but as prisoners of war. Once catechized, they were able to work in Peru in areas related to the military and navy. Eleven of them were temporarily integrated into society but later returned to the United Provinces with useful intelligence for subsequent military expeditions. The study of this particular episode contributes to the historiography on the integration of foreigners in Peru. Thanks to their acceptance of Catholicism, they were able to stay temporarily in the country on a peaceful basis, a situation which they took advantage of to set up an United Provinces’ spy network in the Viceroyalty.

The following article addresses the Colección América Nuestra, directed by the Chilean socialist activist Clodomiro Almeyda between 1955 and 1961. It is argued that the Editorial Universitaria, with this new series, opened itself to a new ideological market, seeking to provide a panorama of the Latin American situation that would rescue a national and anti-imperialist project. Based on the analysis of the set of books in the series, the publisher’s documents, the editor’s ideas and media reviews, the specific context in which the works circulated and their reception are established.

Between 1839 and 1841, threatened by external enemies such as the governments of Bolivia and Ecuador, and internal ones, such as the elites of southern Peru, the second government of Agustín Gamarra sought to lay the foundations of the country for the following decades through complete political reform. This article explores the role that civic and commemorative rituals had in the construction of the legitimacy of the Gamarrista government, and the history of the commemoration ritual of the battle of Yungay, which was placed at the center of the republican calendar. For this purpose, primary sources such as the newspapers La Aurora Peruana, El Amigo del Pueblo and El Peruano, the Guía de forasteros, the Gamarra epistolary and the Colección de leyes, decretos y órdenes publicadas en el Perú, have been used.

This article analyzes the cultural magazines of the 1920s and early 1930s as a space for interaction and convergence between young progressive Chileans and Peruvians. These publications were a product of the University Reform and Chilean-Peruvian tensions and became centers of camaraderie, discussion and circulation of ideas, which would be transformed in the following years into political action and solidarity. The case of the Peruvian APRA exiles supported by Chilean socialists represents one of the most important and intense moments of collaboration in the bilateral history of the two countries.