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

Se presenta en este artículo la primera edición de una breve colección de recetas recogidas en el manuscrito Città del Vaticano, Biblioteca Apostolica Vaticana, Urb. gr. 67, un códice dedicado enteramente a Galeno y compuesto de dos partes bien diferenciadas. En su parte más antigua (ff. 53-275), datable hacia 1300, aparece esta colección de remedios de tradición galénica, que el copista ha añadido (ff. 186v-187v) para completar el cuaderno numerado ??’ (17) al final de la copia de Galeno, De compositione medicamentorum secundum locos.

Applying the Buckley-Leverett theory, presents the results obtained in the secondary recovery of reservoir Basal Tena in the Palo Azul field operated by EP PETROECUADOR. The main objective was to determine the increase of the oil recovery factor in the reservoir Basal Tena by Buckley-Leverett calculation. The study process is constituted: first step, the study area must have continuity the reservoir. Second step, pressure decline analysis in the producing wells of the northern sector of the reservoir Basal Tena, resulting that the main production mechanism is the expansion of rock and fluid. The third step was the development of the Buckley-Leverett theory, determined with the injection of water a recovery factor of 14%, which is 3.5 million barrels of oil. The work concludes that the injection of water has an effect in increasing the recovery factor with respect to the remaining reserves by 4.55%.

An attempt is made to resolve three problems of text and interpretation in the first poem of Propertius: 3 constantis … fastus (leg. constanti … fastu), 12 ille uidere (leg. comminus ipse), 24 ducere (leg. uertere). 

Se estudian aquí tres cuestiones referidas a la tradición renacentista del Económico III de Pseudo Aristóteles: (1) la difusión del texto y sus versiones en los siglos XV y XVI; (2) la ‘retroversión’ al griego de Bernardino Donato, desde muy pronto atribuida a Jacques Toussain; (3) la interpretación de un pasaje del capítulo tercero en que Giovan Battista Pio, en su comentario a Lucrecio, cambia la expresión nec metum incutiat por nec cunnum quatiat. Esta lectura, suavizada como nec partes quatiant, se retomaría a comienzos del siglo XVII en la obra ginecológica de Rodrigo de Castro. 

The operation of industrial equipment is immersed in the manifestation of risk factors from its design to the end of life stage with diverse consequences. the objective of the research pursues the study of risk factors and severity of their consequences in the operation and maintenance of equipment in Ecuadorian manufacturing industries. For the detail of the risk factors of the country's manufacturing sector vs the severity of its consequences, data from risk matrices were collected. Specific case studies were associated with the most common causes of failures recorded in rotating, mechanical, electrical, safety and control equipment according to ISO 14224: 2016. The analysis of the basic or immediate causes associated significant consequences through the application of the cause tree and the grouping of preventive actions. As a result of the study, detection methods were identified according to the samples of risk factors and failure mechanisms registered with the highest number of cases with consequences in production, safety and operations, while the training and activities to improve the environment for consequences in safety and environmental protection. the relationship of the samples from the history of operation and maintenance of equipment with risk factors in common, respond to a statistic with 2 degrees of freedom, alpha 0.05 and reference of 5.99, which according to the Chi-square test are noted sufficient preventive actions to avoid or minimize failures with significant consequences.

The constant evolution of technology has made possible its application in the forestry sector, it is currently possible to characterize the vegetation and estimate forest inventory variables. The objective of this research was to estimate forest inventory variables using images captured with an unmanned aerial vehicle (drone) using photogrammetric processing integrated in a geographic information system in trees on stands under forest management in Santa Catarina Ixtepeji, Oaxaca, Mexico. A sample of 30 trees was used, selected from the census captured and processed by the drone photographs in the stands where height, crown diameter (Cd), crown area (Ca) and diameter at breast height (Dbh) were measured in the traditional way in order to validate digital information. The results of the comparison of both methods using the t-Student test indicate that the estimation of the height and Cd variable does not show significant differences (p> 0.05); however, in the rest of forest inventory variables there were significant statistical differences (p <0.01). In addition, the exponential model used to estimate the Dbh and crown diameter as a function of the height of Pinus oaxacana species was significant (R2 = 0.90 and 0.93 respectively).

The research presents data related to the Strizhkovsky volcanogenic massive sulfide deposit, which is located in the Rudny Altai region, southern Russia. In the present study, samples of polymetallic ores and rocks previously collected were taken as reference. From ten polished sheets of ores, an analysis was carried out with a petrographic microscope and with a scanning electron microscope (SEM) and incorporated with an X-ray electron microprobe. Based on these results, the content (% by weight) of minors associated elements was determined such as Ag, Cd, Bi, Ga, Ge and their theoretical enrichment in basic sulfides (galena, sphalerite, chalcopyrite and pyrite) was calculated.The results show that the theoretical enrichment, considering the sum of the two sulfides with the highest content, for silver (94.83%), bismuth (91.06%), gallium (72.3%) and germanium (75%) is associated with galena and sphalerite, for cadmium (91%) with sphalerite and less galena. The question of attributing Ga and Ge to the mineral components must be adjusted after calculating their reserves in the ore. The data of the theoretical enrichment and the distribution of the content of associated valuable components in the polymetallic ores represent a tool to predict the quality of the different metallurgical concentrates; and in turn to be able to modify the parameters of the metallurgical treatments of lead-zinc ores.

Artificial Intelligence has had a big impact in recent years, this field of Informatics is increasingly used to solve geological problems. One of the main applications is the detection and segmentation of volcanic ash in satellite images. For this purpose, we propose a Deep Learning model based on a Convolutional Neural Network (CNN), trained with a satellite image dataset where the "ash" filter is applied, which provides a reddish-pink coloration to the ash, facilitating the segmentation process. The results show an accuracy of 99%, which is suitable for the segmentation of the ash emitted by Sangay Volcano, which has presented periods of volcanic activity in recent years. Our model generated segmented images that are consistent with the studies published by the IG-EPN.

The purpose of this document is to evaluate the water injection pilot projects implemented as part of the secondary recovery expansion project in the Shushufindi oilfield through the technical monitoring on field of the production parameters that allow identifying the influence of the project in the production wells during 2019-2020. The methodology used is based on the control and monitoring of the data obtained on field, which allows identifying if there is variation in the behavior of the production or injection parameters. For the development of this study, the water injection performance was evaluated, using the Hall plot and injectivity index of each injector well. Moreover, the production parameters of the selected wells near the influence area were analyzed. Among the parameters that were evaluated were: salinity, pressures, flow rates, electrical submersible pump parameters, and workovers carried out during the evaluation period. Once the evaluation of the injection influence was completed, it was determined whether the maintenance of the production is related of the water injection or other types of work performed during the evaluation period.

The purpose of this research is to analyze the effect of the ions concentration in the oil recovery when low salinity water injection (LSW) is applied in the Basal Tena sandstone, lower U sandstone, lower T sandstone and Upper Hollín sandstone, which are reservoirs of the Oriente Basin of Ecuador. LSW incidence in the oil recovery factor was contrasted with two scenarios, which were natural production and conventional water injection. The first step is to interpretate petrophysical properties of the information available from studies of cores and electrical logs of type wells of the 4 reservoirs. The next step is to define the number of layers of the simulation model based on the heterogeneity of each reservoir. On the other hand, the analysis and validation of the PVT data of each sand was carried out to verify that the samples are representative, and the values ​​of the fluid properties are consistent, then the mathematical fluid models were adjusted. Thus, we got a good fit between the experimental and theorical values. Additionally, an analysis of the rock-fluid properties was carried out where the relative permeability curves were normalized. For the construction of the dynamic models, all the previously mentioned data were incorporated. Furthermore, initial conditions and the wells for each one of the reservoirs were added. Physicochemical properties of the formation water and the injection water were included to simulate LSW technique. Finally, we built a LSW sensitivity cases, which included a variation of the ion’s concentration in the formation and injection water. LSW, conventional water injection and natural production results were comparate. The results show the oil recover factor is better with low salinity water injection. The most favorable scenario shows that the recovery factor increases approximately 6%, compared to the secondary recovery project with conventional water injection.