bluuebunny/crossref_metadata_2025 huggingface dataset:
Generating electricity during peak hours in Asuncion, Paraguay, through anaerobic digestion of cultivated water hyacinths
Authors: Maioli A. , Pulfer J. , Mitjans F.
Published: February 2023

The objective of the present paper is to present an innovative and sustainable proposal for generating electricity in the metropolitan area of Asuncion, the capital of Paraguay, based on a renewable source of energy. Electricity would mainly be generated during peak hours with the aim of reducing power contracted by the Paraguayan Electricity Administration (ANDE) from existing hydroelectric power plants and thus reduce costs and stabilise transmission and distribution grids in the area of Asuncion. Electricity would be generated at a 130 MW combined cycle thermal power plant using biogas as fuel, this being obtained by anaerobic digestion of water hyacinths cultivated in pools, which would be built on the banks of the Paraguay river opposite Asuncion's botanical garden. The main advantage of using water hyacinths is their high growth rate, this being 100 to 500 g/day/m2 depending on environmental conditions, thereby allowing plant mass to double every 6 to 15 days. Additionally, carbon to nitrogen ratio in water hyacinth vegetal mass is optimum for biogas generation. About 6.4 kWh/m3 biogas calorific value is high enough to be used for producing heat and, therefore, for generating electricity in a thermal power plant. Such power plant could be directly connected to the national grid through the Puerto Botanic transformer station by building a 2 km long 220 kV transmission line crossing the Paraguay River. This project could save ANDE up to 25 million US$ every year due to reduced contracted power at the Itaipu power plant. Although this reduction will decline by 3% each year due to increased electricity demand, the investment of around 98 million US$ could be repaid within 15 years and would have 5% IRR and US$ 40.5 million NPV.
Generalised strategy for implementing the minimum fault reactance based fault location algorithm in real power distribution systems
Authors: Correa-Tapasco E. , Mora-Flórez J. , Pérez-Londoño S.
Published: February 2023

The paper presented here is aimed at proposing a generalised strategy for easily implementing a fault locator in real power distribution systems. The strategy is based on the definition of a fault location method and its successive application along section lines from a power substation to the section where the fault has been determined. According to the results, the proposed strategy seems to be applicable to real power systems as an alternative for reducing fault location time and thus keeping good continuity indexes.
Applying FBD-power theory to analysing effective lighting devices' impact on power quality and electric grid efficiency
Authors: Pavas Andrés , Blanco Ana María , Parra Estrella
Published: February 2023

Currently the impact of high efficient lighting devices such as compact fluorescent lamps (CFL) and light emitting diodes (LED) is an important concern for the electrotechnical community. This paper makes a contribution towards determining the impact of these devices on electric grid power quality and efficiency, proposed by means of applying FBD-power theory to the currents absorbed by CFLs and LEDs. An analysis of the waveform distortion regarding IEEE standard 519 and efficiency detriment quantification are presented.
Characterising structural, mechanical and cytotoxic properties of coral-based composite material intended for bone implant applications
Authors: Samper Gaitán Angela , Rojas Mora Fabio Arturo , Narváez Diana María , Méndez Moreno Luis Miguel
Published: February 2023

Studies concerning the application of Porites asteroides coral for bone implant purposes have demonstrated the biological viability of its use. As a complement to previous research regarding the development of bone-powder based composite materials which are useful for such applications, this study was aimed at developing a coral powder-based composite material which would be able to satisfy the appropriate structural, mechanical and cytotoxic properties required for its use. A composite material made of coral powder, calcium sulphate powder and water was therefore developed, and its properties were tested in different compositions. The results showed how the resulting composite material had properties which were comparable to those of human cortical bone (from both a structural and mechanical point of view), as well as being non-toxic below a 0.35 mg/ml critical composite material concentration.
Uncertainty regarding instantaneous discharge obtained from stage-discharge rating curves built with low density discharge measurements
Authors: Martínez Plata Juan Felipe , Domínguez Calle Efraín Antonio , Rivera Hebert Gonzalo
Published: February 2023

This work concerned uncertainty analysis for constructing stage-discharge rating curves to estimate error or uncertainty regarding calculated discharges, considering different discharge measurement availability scenarios. A methodology was used for creating artificial samples of discharge measurements from real data observed in the field and the effect of variation on measurement quantity and distribution concerning instantaneous discharge uncertainty was then studied. The results indicated that discharge uncertainty mostly depends on the number of river discharge measurements used for rating curve calibration and on the extent of extrapolation outside the range of measured river water levels. This research found that uncertainty regarding instantaneous discharges calculated for the area within average level values could be as high as 14% when the rating curve was calibrated with few measurements. Uncertainty can reach 20% and 60% for high and low water level values, respectively, or even higher depending on the extent of rating curve extrapolation. This work established that 35 discharge measurements for rating curve calibration were needed to fulfill World Meteorological Organization standards concerning discharge defined for low water level values.
Towards a framework for improving requirement traceability
Authors: Toranzo Céspedes Marco Antonio , Cysneiros Filho Gilberto , Gómez Yessica , Rodríguez Mendoza Oscar
Published: February 2023

Work regarding requirement traceability focuses on programming aspects instead of identifying, analysing and modelling all traceable data in a software project. This paper describes the development of a framework for improving software requirement traceability. The framework consisted of classifying traced information, defining and using relationship types regarding traced information, a set of guidelines for developing a requirements traceability model for a software project and using my management tool (MyMT tool) to support developing a requirement traceability model. A university library management system was used to illustrate applying the framework.
The effect of Ti(CN)/TiNb(CN) coating on erosion-corrosion resistance
Authors: Aperador Chaparro William , Ramírez Martín Carlos , Caicedo Julio Cesar
Published: February 2023

The goal of this work was to study electrochemical behaviour in corrosion-erosion conditions for Ti(CN)/TiNb(CN) multilayer coatings having 1, 50, 100, 150 and 200 bilayer periods on AISI 4140 steel substrates by using a multi-target magnetron reactive sputtering device, with an r.f. source (13.56 MHz), two cylindrical magnetron cathodes and two stoichiometric TiC and Nb targets. The multilayers were evaluated by comparing them to corrosion, erosion and erosion corrosion for a 30º impact angle in a solution of 0.5 M NaCl and silica, analysing the effect of impact angle and the number of bilayers on these coatings' corrosion resistance. The electrochemical characterisation was performed using electrochemical impedance spectroscopy for analysing corrosion surface; surface morphology was characterised by using a high-resolution scanning electron microscope (SEM). The results showed a decreased corrosion rate for multilayer systems tested at 30°.
The corrosion resistance and microstructure of UBM system-deposited NbxSiyNz thin films
Authors: Velasco Estrada Leonardo , Olaya Florez Jhon Jairo , Rodríguez Baracaldo Rodolfo
Published: February 2023

NbxSiyNz thin film nanostructure was grown using the unbalanced magnetron sputtering (UBM) technique with varying Si content. Corrosion resistance was evaluated by potentiodynamic polarisation technique in a 3% NaCl solution. Microstructure was analysed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and laser scanning microscopy. Chemical composition was ascertained by X-ray fluorescence (XRF) technique. The results showed that deposition rates increased with higher Si content. A microstructural change was observed for greater than 5% Si content through the transition from a crystalline to an amorphous structure in the thin films. Corrosion test results demonstrated that the thin films having the highest silicon content had better corrosion resistance.
A review of asphalt and asphalt mixture aging
Authors: Fernández-Gómez Wilmar Darío , Rondón Quintana Hugo Alexander , Reyes-Lizcano Fredy
Published: February 2023

This paper presents an extensive review of the pertinent literature regarding asphalt and asphalt mixture aging. Aging affects flexible pavement performance and is produced by intrinsic and extrinsic variables as well as exposure time. Intrinsic variables include asphalt and aggregate properties, a mixture's asphalt content, binder film thickness and air void content; extrinsic variables are associated with production (short-term aging) and exposure to environmental field conditions (long-term aging). Taken together, both variables demonstrate that aging results from three distinct mechanisms: volatilisation, oxidation and steric hardening. Temperature, pressure and photo degradation treatments are used to simulate aging in the laboratory and empirical and semi-empirical models are created to represent and study aging. Aging increases asphalt complex modulus and decreases the phase angle. Mixtures become stiffer while fatigue life becomes reduced. Carbonyl and sulfoxide group formation in asphalt are often studied as such chemical changes show oxidation in aged asphalts. The prevailing models used to predict asphalt aging are discussed, though more comprehensive research into asphalt aging is still needed.
Beneficiated coals' char morphology
Authors: Vargas Diana , Chaves Sanchez Deisy , Trujillo Uribe Maria Patricia , Piñeres Mendoza Jorge Luis , Barraza Burgos Juan Manuel
Published: February 2023

This work evaluated the char morphology of beneficiated and original coal (without beneficiation) from four Colombian coalmines: Cerrejón (La Guajira), La Jagua (Cesar), Guachinte (Valle del Cauca) and Nechí (Antioquia). Column flotation was used to obtain beneficiated coal, whereas a drop tube reactor at 1,000oC, 104 oC/s heating rate and 100 ms residence time was used to obtain char. The chars were analysed by image analysis which determined their shape, size, porosity and wall thickness. It was found that char morphology depended on coal rank and maceral composition. Morphological characteristics like high porosity, thinner walls and network-like morphology which are beneficial in improving combustion were present in vitrinite- and liptinite-rich lowest-ranking coals. Beneficiated coals showed that their chars had better performance regarding their morphological characteristics than their original coal chars.
Using genetic algorithm feature selection in neural classification systems for image pattern recognition
Authors: Gamarra A. Margarita R. , Quintero M. Christian G.
Published: February 2023

Pattern recognition performance depends on variations during extraction, selection and classification stages. This paper presents an approach to feature selection by using genetic algorithms with regard to digital image recognition and quality control. Error rate and kappa coefficient were used for evaluating the genetic algorithm approach Neural networks were used for classification, involving the features selected by the genetic algorithms. The neural network approach was compared to a K-nearest neighbour classifier. The proposed approach performed better than the other methods.
Total organic carbon removal from a chemical lab's wastewater using Fenton's reagent
Authors: Martínez Ávila Oscar Mauricio , Franco José Herney Ramírez , Toledo Reyes Magda Lorena
Published: February 2023

Treating industrial wastewater represents a serious problem nowadays; it requires a strong understanding of the particular systems and (in most of cases) ad hoc solutions. This work describes the use of Fenton's reagent (reaction between H2O2 and Fe(II)) for removing total organic carbon (TOC) from a particular chemical laboratory's lab-scale batch reactor wastewater. Some operating variables (hydrogen peroxide and ferrous ion concentration, temperature and pH) were evaluated regarding final TOC removal. An economic optimisation was made by means of a second order polynomial model representing these variables' behaviour regarding TOC removal (0.94 R2). The highest experimentally reached TOC removal was 88.8% at 50 mg/L [Fe(II)]0, 50 mM [H2O2]0, pH=2.8 at 80ºC, while 53.9% was obtained in optimised conditions, i.e. 36 mg/L [Fe(II)] 0,45.5 mM [H2O2]0, pH=2.6 at 20oC. It was found that the Fenton process could achieve 41% removal, even in adverse conditions (pH close to 6). It was noted from the analysis that both H2O2 concentration and temperature had a powerful effect on organic matter degradation efficiency, as well as on total treatment cost.
Evaluation of Green's function when simulating earthquake records for dynamic tests
Authors: Carrillo Julian , Rubiano Astrid , Delgado Arnoldo
Published: February 2023

When dynamic performance of structures is assessed experimentally, most experimental studies consider variation in intensity by increasing the record of peak ground acceleration or displacement at different values. However, severity of earthquake motion is not only a function of the concerns instrumental intensity, but also the frequency content, duration and the amount of energy imposed on the structure. To fulfill dynamic test conditions, this paper describes and discusses a novel method for selecting several seismic events characterising the seismic area and fulfilling particular similitude requirements. The method included using an earthquake record as an empirical Green's function for simulating larger magnitude events. Three seismic events used for shake table testing of reinforced concrete walls for low-rise housing are presented and discussed to validate the proposed method's results.
Analytical synthesis for four-bar mechanisms used in a pseudo-equatorial solar tracker
Authors: González Mendoza Juan Manuel , Palacios Montufar Cándido , Flores Campos Juan Alejandro
Published: February 2023

Photovoltaic energy production systems generate electricity without emitting pollutants into the atmosphere and do so from a free, unlimited resource. The highest level of energy conversion from the photovoltaic panels can be obtained by placing them perpendicular to the sun's rays falling on their surface; this is done by installing solar tracking systems. This work proposes the use of two four-bar mechanisms as the driving force for a solar tracker; we propose the use of analytical synthesis for such mechanisms. This procedure is aimed at optimising the transmission angle, increasing mechanical advantage and decreasing driving torque. A mathematical model was used to prove synthesis results and a prototype of the solar tracker was built.
Experimental on-line platform for product conceptual design: OpenDesigNet
Authors: Magal-Royo Teresa , Jorda-Albiñana Begoña , Lozano-Suaza Rodrigo
Published: February 2023

This paper highlights the need for using specialised on-line collaborative environments by designers and product engineers who increasingly use Web 2.0 technology to search for information. Although there are professional channels and networks, there is no specific platform which helps during a new product's conceptualisation phase. Open communication must thus be promoted and encouraged amongst design professionals and companies to form working groups thereby allowing them to work collaboratively in the most open and creative phase of product design, i.e. conceptualisation. The OpenDesigNet (ODN) experimental platform has been developed so that designers and small- or medium-sized companies (SMC) can access on-line collaborative tools to support the creation and promotion of new on-line products and assess their immediate social impact. This article presents some of the results obtained during the validation phase involving a platform satisfaction survey of design engineering students and has led to a first-hand assessment of the new platform's potential impact on their professional future.
The potential of rhizobacteria for use of rambutan (Nephelium lappaceum) peel as organic fertilizer
Authors: Vo Xuyen Thi , Pham Truyen Thanh , Le Ngoc Bao Thi , Nguyen Nhut Nhu
Published: February 2023

Rambutan (Nephelium lappaceum) production is growing worldwide so the treatment and utilization of Rambutan by-products has become a concern of manufacturers. The objective of this study was to evaluate the potential application of rhizobacteria to decompose Rambutan peel for organic fertilizer production. After the rhizospheric soil samples were selectively proliferated and preadded on agar medium containing only Rambutan peel, the rhizobacterial colony isolates were screened based on their ability to grow on this agar medium and then to degrade cellulose in Rambutan peel. The LD7.3 isolate from the Rambutan rhizosphere showed the highest efficiency in degrading Rambutan peel with 5.6% degraded cellulose content and was identified by the MALDI-TOF technique as belonging to Klebsiella. Klebsiella sp. LD7.3 grew well and maintained the same degrading activity after three times of subculturing in liquid medium. Notably, the supplementation of grinded Rambutan fruit peel to the liquid medium had a positive effect on the growth and the degrading activity of Klebsiella sp. LD7.3. This was the primary report on the application of rhizobacteria to degrade Rambutan peel and the results showed that this was a potential approach to reuse this waste source.
A latent profile approach for classifying internet gamers based on motives for online gaming
Authors: Kim Bin-Na , Kang Hyo Shin , Park Jungkyu
Published: February 2023

Background and aims

Online gaming motives have proven to be useful in differentiating problematic engagement in online gaming. However, the mixture modeling approach for classifying problematic subtypes based on gaming motives remains limited. This study attempted to differentiate heterogeneous online gamers into more homogenous subtypes based on gaming motives using latent profile analysis (LPA). We also compared various psychological and gaming/leisure related variables across the derived profiles.

Methods

A total of 674 Korean online game users (mean age = 21.81 years, male = 76%) completed self-report questionnaires, including the Korean version of the Motives for Online Gaming Questionnaire (K-MOGQ). After the LPA, the relationships between latent profile membership and auxiliary variables were explored.

Results

Four latent profiles were identified, that were further classified into one problematic (highly motivated-dissatisfied gamer), one highly engaged (highly motivated-satisfied gamer), and two casual (moderately-motivated casual gamer and lowly-motivated casual gamer) gamer profiles. Inter-profile comparisons revealed that highly motivated-dissatisfied gamer had the most pathological profile, characterized by high Internet gaming disorder (IGD) tendency, neuroticism, and impulsivity, but the lowest recreation motive. While highly motivated-satisfied gamer also demonstrated a heightened IGD tendency, they showed positive patterns of psychological and gaming/leisure-related variables, which indicated they could be better considered as high engaged instead of problematic gamers.

Discussion and conclusions

These results indicate that the recreation motive, in addition to fantasy or escape motives, is an important factor in differentiating maladaptive online gamers. Classifying online gamers based on gaming motives can contribute to a clearer conceptualization of heterogeneous gamers, paving the way for individualized assessment and treatment planning.
Монастырская реформа 1864 года в Царстве Польском на примере Ченстоховского Ясногорского монастыря
Authors: Siemienienko Anna
Published: February 2023

In the consequence of the January Uprising catholic convents in the Kingdom of Poland (among which the convent of Pauline Fathers from Częstochowa was) were regarded by the tsarist’s apparatus as places in which rebirth of anti-Russian moods might appear. For this reason convents’ activity was controlled thoroughly. Certain mechanisms of a control were developed. The mechanisms were mainly used to control finances. Other areas were also controlled, but the control was not as direct as in the case of finances. The government did not interfere much in convents’ inner matters. They assumed that if any accusations (either in social or political sense) against individual monks or the whole community of monks appeared the responsibility rested on superiors of a convent or a diocesan bishop where the acts would take place. The article Standards of functioning and running Roman Catholic convents in the Kingdom of Poland written in 1864 was the document established binding standards concerning the issue.
“Please Open Our Church… in the Name of Historical and Human Value of Socialism”. Orthodox Believers’ Letters to Power, 1960s–Early 1970s
Authors: Shlikhta Natalia
Published: February 2023

The article is intended as an introduction into the study of a particular source on the Soviet-period history of the Church. It demonstrates potential for the interdisciplinary survey of “letters to power” as an action and a source within broader contexts of the Orthodox Church’s integration into a Soviet society and its defensive strategies. Soviet believers’ letters, written in defense of their Church and their religious rights, became the most widespread form of their protest against discriminatory policy pursued by the state. In the first part the author provides a general overview of believers’ petitioning (as the text and the action) focusing on their reasons for writing letters, their self-representation and the view of the authorities. The author also examines discursive techniques and rhetorical conventions used it the letter. In the second part of the article the author examines a revealing case: the petitioning campaign of Orthodox believers from Chernihiv in defense of St. Trinity Church as it is presented in their letters written between 1962 and 1972.
The Culture of Quoting in Simeon Polotsky’s Epistles: Biblical Texts and Liturgical Books
Authors: Prieobrażenska Anastasija
Published: February 2023

The article looks into biblical quotations in letters and epistles by the first Muscowy court poet Simeon Polotsky (1629–1680). In the second half of the 17th century Russian literature was changing dramatically while encompassing Western tradition and secular tendencies. Biblical texts also became a subject for revision for various reasons. Simeon Polotsky, educated in the Mohyla Collegium and in Poland, used biblical texts extensively not only in his sermons, but also in his private letters and epistles. To explore the role biblical quotations played in Simeon’s letters, the article analyzes the corpus of Simeon’s epistolary texts in comparison with other letters of the period. Classification of quotes is given to demonstrate the ways in which Simeon treated biblical texts, editing and correcting them.
Prepozytura szpitalna w Kraśniku w świetle staropolskich wizytacji biskupich
Authors: Hałaburda Marek
Published: February 2023

Hospital parish dedicated to Holy Spirit in Kraśnik originated on 11 March, 1531. It was founded by Jan Gabriel Tęczyński, who was a castellan and mayor of Lublin, and also was the contemporary owner of the city. The foundation received the confirmation from Cracow Bishop Piotr Tomicki, on 30 August, 1531. The hospital parish in Kraśnik took care of the poor and those who were in need fulfilling orders of the Church about charity. Its activity started in the moment of originating and lasted for the whole Old Polish period. The purpose of the article is to reconstruct history of the parish basing on Old Polish inspections of bishops. Basic material of the discussed issue has been delivered by inspection books of the Diocese of Kraków coming from 1592, 1598, 1601–1605, 1617, 1637, 1682, 1689, 1719, 1741, 1748, 1781.First ten inspections mentioned are stored in the Archive of Metropolitan Curia in Kraków. The last one is stored in the Archive of the Archdiocese of Lublin. Rich material coming from the visits was extended with very precious information. It was gained as the result of the inquiry carried out on records which provided information on activities of bishops “Acta Episcopalia”. The files of the office of the curate “in spiritualibus”, and the general official “Acta Officialia” were also analysed. The chronicle of priest Stefan Ranatowicz, stored in the Archive of Jagiellonian University, has also been a source of very precious information.
Duchowieństwo diecezji kamienieckiej w przededniu powstania listopadowego
Authors: Szczepaniak Jan
Published: February 2023

The Catholic clergy in Podolia and landowners belonged to elites of the province. The social and cultural position of the Catholic clergy was not threatened even by the czar’s clerks and the Orthodox clergy until the November Uprising. The situation was changed by the policy of the Petersburg court after suppressing of the Uprising. They tried to destroy Catholic and Polish character of Eastern guberniyas which were attached to Russia as a result of the partitions of the Republic of Poland. Podolia was inhabited by 256 clergymen of Catholic all rites in 1830. In churches and chapels belonging to the diocese lived 162 priests (63,6%), and in cloisters 94 (36,4%). 137 priests belonged to the Kamienets diocese out of all priests who were connected with Latin churches and chapels, and 17 belonged to the presbytery of the uniate Lithuanian diocese. Most of priests who belonged to the Kamienets diocese were involved to the ministry (74 provosts, pastors, and long term administrators – 54%; 50 vicars – 36,5%). They mostly came from Podolias, from noble families. Most of them got general education and were prepared to priesthood there. They lived 55 years on average.
A study on the comparison of technical indicators used in stock price prediction with the BAHP method
Authors: Akkaynak Bilal
Published: February 2023

Savers want to direct their savings to investment areas where they can get maximum efficiency. This is the most basic feature that a rational investor should have. Stock investors also want to manage their investments with this thought. In this respect, investors conduct detailed research on the sector and stock they plan to invest in. Predictions regarding the possible price formation of the stock in the future is one of these studies. In the finance literature, there are many indicators, ratios, analyzes, indicators and oscillators developed for the future price prediction of the stock. In this study, technical indicators used by licensed professional stock investors were obtained by taking expert opinion. These indicators were conveyed to the experts again to get their opinions with the help of the fuzzy comparison matrix and the experts were asked to compare the variables. The data obtained were analyzed with the Fuzzy Analytical Hierarchy Process (FAHP) method and the technical indicators and ratios used by the experts were listed according to a certain hierarchy. As a result of the analysis, it has been determined that the most important ratio in the stock price estimation process is the MV/BV ratio. While EBIT is the second most important ratio in stock price prediction, P/E is the third most important indicator.Savers want to direct their savings to investment areas where they can get maximum efficiency. This is the most basic feature that a rational investor should have. Stock investors also want to manage their investments with this thought. In this respect, investors conduct detailed research on the sector and stock they plan to invest in. Predictions regarding the possible price formation of the stock in the future is one of these studies. In the finance literature, there are many indicators, ratios, analyzes, indicators and oscillators developed for the future price prediction of the stock. In this study, technical indicators used by licensed professional stock investors were obtained by taking expert opinion. These indicators were conveyed to the experts again to get their opinions with the help of the fuzzy comparison matrix and the experts were asked to compare the variables. The data obtained were analyzed with the Fuzzy Analytical Hierarchy Process (FAHP) method and the technical indicators and ratios used by the experts were listed according to a certain hierarchy. As a result of the analysis, it has been determined that the most important ratio in the stock price estimation process is the MV/BV ratio. While EBIT is the second most important ratio in stock price prediction, P/E is the third most important indicator.
Estudio sobre modelos de clúster automotriz en la zona andina transfronteriza de Ecuador-Colombia
Authors: Almeida- Pillajo Roberth James , Sierra- Lara Yoandris
Published: February 2023

El desarrollo del tema presentado en este artículo centra su objetivo principal en identificar el interés de asociatividad de los principales actores en la propuesta de un modelo de Clúster Automotriz en la Zona Andina Transfronteriza de Ecuador-Colombia, contribuyendo como una alternativa al desarrollo económico social en esta región transandina, con la articulación de la provincia del Carchi al norte de Ecuador y la subregión exprovincia de Obando al sur del Departamento de Nariño en Colombia. Para ello, se emplea una metodología de investigación no experimental, transversal y descriptiva. En este sentido, se describe un entorno socioeconómico en el que existe una dinámica de desarrollo local en la productividad de maneracompleja dado que se evidencia una interrelación en el ámbito comercial que permite comprender dicho desarrollo sobre la base de la teoría de sistemas en el diseño de un modelo de organización empresarial que facilite la interacción dinámica de los actores regionales desde un enfoque complejo en las ciencias económicas. En este orden de análisis, se espera que los resultados positivos, de los datos derivados sobre los procesos estadísticos y de prospectiva contribuyan a validar el diseño de un modelo de simulación basado en dinámica de sistemas con el programa de computación Vensim PLE x32 V.7, 2a. Esto permitirá conocer el impacto de un Clúster automotriz como alternativa de desarrollo en la región. En conclusión, se considera que un modelo único de Clúster automotriz como alternativa de desarrollo en esta zona transandina será de gran utilidad para el desarrollo productivo.
La experiencia laboral de los estudiantes de universidades públicas ¿Un sistema dual espontáneo?
Authors: Sepúlveda Edith Rivas , Nava-Cruz Raúl , Planas-Coll Jordi
Published: February 2023

Que trabajando se aprende es una obviedad que nadie cuestiona. Con la expansión educativa que inició en la segunda mitad del siglo XX, trasladamos nuestra atención hacia la educación formal como fuente de “Capital Humano” relegando a la experiencia laboral como algo posterior y subordinado a la escolarización. En la actualidad, se está produciendo un tímido retorno a valorar la experiencia laboral como fuente de aprendizajes. En este texto se analiza el trabajo de los estudiantes universitarios a partir de los resultados de dos tesis doctorales, una sobre los estudiantes de licenciatura de la Universidad Autónoma Metropolitana Azcapotzalco y otra, sobre la experiencia laboral previa de los estudiantes de maestría en la Universidad de Guadalajara, en ambos casos se emplea un enfoque cuantitativo y generación de tipologías. No se dispone de datos estadísticos representativos sobre el trabajo del conjunto de los universitarios mexicanos, pero los dos casos presentados, muestran cómo los procesos de aprendizaje, tanto de estudiantes de grado como de maestría, implican en realidad que la mayoría de los estudiantes universitarios trabaja durante sus estudios y/o ha trabajado anteriormente configurando lo que llamamos un enorme “Sistema Dual Espontáneo”.
La generación de envejecimiento saludable en la sociedad poscovid. Una reflexión necesaria desde la educación
Authors: Salmerón-Aroca Juan Antonio , De Miguel-López Silvia Martínez
Published: February 2023

Este trabajo parte de la idea de que la titularidad del derecho a una educación a lo largo de la vida, que en su caso poseen las personas mayores, les confiere la potestad de requerir de los instrumentos de comunicación y entendimiento profesionales para promover un aprendizaje significativo. Sin embargo, la disposición de servicios asistenciales en el contexto del covid-19 enfocados a personas mayores, se viene proporcionando de manera discrecional, relegando de forma notoria las opciones de la Gerontagogía. En este caso, el texto plantea como objetivo, realizar una reflexión y análisis concelebrado de alianzas, que se vertebra en principios de ética profesional. Para ello, se utilizó un análisis hermenéutico crítico de extensión socioeducativa a partir de los principales núcleos temáticos relacionados con el objeto de estudio. Muy pocos estudios han examinado cómo ambas fuentes de conocimiento se interrelacionan para mediar en la salud de las personas de edad avanzada. Su desarrollo se ha centrado en la contribución conjunta que realizan las alternativas socioeducativas y la bioética, para la generación de comportamientos saludables en personas sénior. Se concluye, que la utilización de técnicas cualitativas por parte de los profesionales para la acción socioeducativa de los programas de envejecimiento saludable y de promoción de la salud, no son tan sólo una manera para motivar aprendizajes sobre calidad de vida. Son también una condición construida para enfrentar la variabilidad en la educación recibida, la experiencia, la acumulación cultural y su resiliencia, y, sobre todo, un ejercicio profesional para salvaguardar su dignidad, enfocado en la autonomía, beneficencia y justicia.
Diseño curricular de programas educativos de diplomados en la Universidad Autónoma de Sinaloa. Etapa: fundamentación
Authors: Estrada Eslava Edgar , Ibarra-López Fidel , Trimiño-Quila Bernardo , Virgen-Anguiano Luis Manuel
Published: February 2023

El contenido del presente artículo corresponde a uno de los hallazgos de la investigación que se realizó para comprender y exponer cómo es el diseño curricular de Programas Educativos (PE) de diplomados en las Instituciones de Educación Superior (IES), teniendo como contexto el de la Universidad Autónoma de Sinaloa (UAS) de México. Lo que se expone aquí es la descripción de la etapa de fundamentación en el diseño curricular de los PE de diplomados, tomando como base teórica el modelo de diseño curricular propuesto por Díaz-Barriga, Lule, Rojas y Saad en el año 2008 acoplando las subetapas y actividades señaladas en el modelo de la UAS. Desde el enfoque cualitativo, se utilizó el método de estudio de caso, se eligió, como estrategia de recolección de información el análisis de materiales escritos y, como técnica de análisis, la clasificación y categorización. De esa manera, se descubrió que la etapa de fundamentación se estructura con subetapas como el análisis del marco institucional que incluye actividades como diagnóstico de necesidades y justificación.
Las incertidumbres de la gratuidad. Aproximación a las erogaciones financieras de las clases desfavorecidas en la educación pública de Paraguay
Authors: Ortiz Luis
Published: February 2023

This study shows how children who come from disadvantaged social classes depend on public funding to access public education, which does not ensure the full conditions to develop all the aspects that comprise the educational process. Thus, this study was based on a descriptive and analytical approach that involved a survey and quantitative analysis of the money disbursed by households allocated to education. In addition, an interview was implemented to survey and understand the meanings of financial outlays for families and communities. The results show that partial financing would allow families to require minimum income and financial means to ensure schooling conditions or, otherwise, children would face the risk of lagging, dropping out and resignation from the educational process. This problem which, is based on depending on financial means to exercise a right, shows the weakness of the Paraguayan State to guarantee the principle of universality.
La práctica pedagógica del inglés en la educación rural. Un análisis de política pública y metodologías de enseñanza
Authors: Monroy Ramírez Oscar Mauricio , Patiño- Agudelo Samuel
Published: February 2023

Enseñar inglés en las instituciones educativas rurales de Colombia es un tema que ha sido objeto de múltiples investigaciones, debido a la brecha que existe entre lo urbano y lo rural, caracterizadas principalmente por el difícil acceso a la educación en esas zonas, configurando así desafíos en las políticas públicas a nivel educativo. En tal sentido, el presente artículo tiene como objetivo analizar las prácticas pedagógicas llevadas a cabo en Colombia en un periodo comprendido entre el año 2010-2020, y, cómo estos, permitieron un debate conceptual y metodológico para establecer un marco problémico de investigación en un nuevo paradigma de la educación colombiana. La metodología se centró en un estudio de revisión documental. Entre las conclusiones más relevantes se evidencian las dificultades en la capacitación docente; las metodologías de enseñanza y la escasez de material pedagógico y didáctico; el acceso a la conectividad; el diseño de las políticas públicas a nivel educativo, que en la enseñanza de una segunda lengua contienen estructuras lingüísticas homogeneizantes donde difícilmente se logra integrar la lengua materna y la lengua extranjera; la incursión de las TIC con los contenidos curriculares; y metodologías emergentes de enseñanza del inglés como el bilingüismo.
Infancias consumidoras: reflexión del consumo del celular y sus efectos sobre estudiantes
Authors: Mahecha - Montañez Andrea Marcela , Burbano - Ramírez Francisco Alexander
Published: February 2023

El presente artículo reflexiona sobre los efectos entre la relación del consumo simbólico de celulares y el rendimiento académico de estudiantes de grados cuarto y quinto de primaria; para tal fin, este estudio contó con la participación de 32 estudiantes de grado cuarto y quinto de primaria del Liceo Femenino Mercedes Nariño de la ciudad de Bogotá, en un rango de edad de 8 a 12 años. El eje problematizador es el consumo simbólico, entendido como la relevancia del significado que les dan los consumidores a las mercancías, siendo estas un medio para establecer relaciones sociales y, a su vez, construir su propio ser o identidad. En este sentido, se plantea un ejercicio reflexivo que busca entender la conexión entre dicho fenómeno y el rendimiento académico de los sujetos de estudio. Frente a la metodología, el trabajo se enmarcó en el enfoque cualitativo, para el diseño se aprovecharon los siguientes marcos interpretativos: etnografía virtual, fenomenología y, finalmente, teoría fundamentada, método que se complementó a partir de la implementación del software para el análisis de datos cualitativos Atlas.ti. Respecto a las conclusiones, fue posible determinar que los sujetos de estudio identifican con plenitud diferentes símbolos culturales que giran en torno al consumo del celular y las dinámicas sociales que se tejen frente a ese consumo, además, se logró identificar la influencia del consumo del celular con el desempeño académico del estudiantado, por último, se reconoce la importancia del uso del celular para apoyar procesos pedagógicos y didácticos que fomenten la apropiación y creación de conocimiento.
Pediatric Brain Tumor Risk Associated with Head Computed Tomography: Systematic Literature Review
Authors: Kuznetsova Dilara R. , Gabdullina Diana A. , Makhmudova Alina F. , Bochkina Elena V. , Platonova Elizaveta O. , Zhirnov Bogdan O. , Akhmetgareeva Elnara E. , Atangulova Liliya S. , Shein Ruslan S. , Rakhimova Kristina I. , Pakalnis Vlastilin V. , Ganieva Elza R.
Published: February 2023

Computed tomography (CT) of the brain has changed diagnostic neuroradiology significantly over the past 50 years since it was firstly used back in 1971 to visualize suspected frontal lobe tumour. The safety of head CT is determined by the small amount of radiation and the low sensibility of brain tissue to cytotoxic damage due to ionizing radiation compared to other organs. However, some population groups may be at increased risk. Thus, children are more susceptible to radiation cancer than adults and lifelong attributive risk (LAR) can be more than 10 times higher for an infant than for a middle-aged adult. The authors have reviewed published studies that examined the prevalence and mortality of intracranial tumors in children undergoing head CT in comparison to unaffected individuals. Electronic search of publications in the PubMed database from 1966 to date was carried out. We have carried out intersectoral search for documents containing keywords or medical subject headings (MeSH) related to three wide categories: 1) computed tomography, 2) radiation-induced tumors, 3) risk, morbidity or epidemiology. Further search was performed in manual mode. Available epidemiological data generally confirmed correlation between head CT and tumor growth induction. Thus, current epidemiological data accept the opinion that the risk of tumor induction associated with head CT in children is very small (one tumor per 3,000–10,000 studies). The minimal estimated risk of tumor induction due to head CT in children is mostly offset by its diagnostic imaging benefits considering the clinical indications to minimize radiation dose. Understanding and quantitative risk assessment of carcinogenesis associated with CT imaging led to dose reduction in pediatric CT protocols. This trend should continue and should be implemented in all age groups. Although the decision to perform head CT is often undeniable (injury or hemorrhage), careful assessment of studies frequency is required, especially in patients who need disease monitoring. Cumulative effect in such cases may increase the minimal risk of carcinogenesis. Larger and advanced epidemiological studies are required to better understand these risks.
O Sistema de Vigilância Alimentar e Nutricional (SISVAN) como ferramenta de monitoramento do estado nutricional de crianças e adolescentes no Brasil
Authors: Mrejen Matías , Cruz Maria Vitória , Rosa Leonardo
Published: February 2023

No Brasil, o Sistema de Vigilância Alimentar e Nutricional (SISVAN) é a ferramenta central para coletar e consolidar informações sobre o estado nutricional e alimentação da população atendida pelos serviços de atenção básica no país. Este trabalho explora dados do SISVAN com o objetivo de analisar o potencial do sistema como ferramenta de monitoramento do estado nutricional de crianças e adolescentes no país. Procura-se avaliar a evolução da taxa de cobertura do sistema em relação à população para diferentes faixas etárias e regiões geográficas, como essa taxa de cobertura varia conforme as características dos municípios brasileiros e em que medida os resultados provenientes do SISVAN diferem de pesquisas amostrais representativas da população. Apresentamos quatro principais resultados. Primeiro, documentamos que, entre 2008 e 2019, o SISVAN expandiu significativamente a sua cobertura, mas houve uma queda expressiva em 2020 até níveis similares aos do início da série. Segundo, nossos resultados apontam que a cobertura não é homogênea, sendo maior nas regiões Norte e Nordeste e entre crianças de menor idade. Terceiro, existe uma associação sistemática entre características dos municípios e o nível de cobertura do sistema. Por último, os resultados do SISVAN divergem dos apresentados por pesquisas representativas da população geral. Em conjunto, os resultados deste estudo apontam para a necessidade de refinar os instrumentos de vigilância nutricional sobre crianças e adolescentes no Brasil.
Canine atopic dermatitis: systemic immunomodulatory protocol based on clinical phenotype
Authors: Ferreira Tiago Cunha , Cunha Marina Gabriela Monteiro Carvalho Mori da , Nunes-Pinheiro Diana Célia Sousa
Published: February 2023

ABSTRACT: Canine atopic dermatitis (cAD) is a multifactorial allergic disease associated with immune dysfunction and abnormal skin barrier. Several immunological mediators play a role in its pathogenesis. Such molecules are produced by the activation of T helper lymphocytes (Th) through polarization to Th1 and/or Th2, which contributes to different lesion patterns. Acute lesions are mediated by an activation of the Th2 cytokine axis, which clinically induces erythema and pruritus. Conversely, in chronic injuries a mixed immune response of Th1/Th2 cytokines occurs, leading to hyperpigmented and lichenified skin. The clinical understanding of these patterns and the mode of action of immunomodulators are crucial for the best clinical management of the atopic patient. In this context, this review discussed the role of the immune response and the immunomodulatory drugs in dogs with atopic dermatitis and suggested a therapeutic protocol based on clinical phenotype. Based on the evidences showed in this review, it is considered appropriate to use immunomodulatory drugs that target cytokine spectrum related with the clinical phenotype of cAD.
Blood biochemical parameters of lambs fed diets containing cactus cladodes
Authors: Silva T.G.P. , Lopes L.A. , Carvalho F.F.R. de , Soares P.C. , Guim A. , Silva Júnior V.A. , Batista Â.M.V.
Published: February 2023

ABSTRACT This study aimed to evaluate the effects of partial replacement (750g/kg) of Tifton hay by two cactus cladodes (Nopalea or Opuntia) on the metabolic profile of lambs. Thirty-six uncastrated male Santa Inês lambs (22.0 ± 2.9kg initial body weight) were distributed in a completely randomized design, with three treatments and 12 repetitions. The animals were fed a control diet (Tifton hay as exclusive roughage), Miúda cactus cladodes-based diet or Orelha de Elefante Mexicana (O.E.M.) cactus cladodes-based diet. Blood samples were collected one day before (baseline) and 45 days after the introduction of the tested diets. The Miúda cactus cladodes caused an increase (P=0.055) in the serum activity of the gamma-glutamyl transferase enzyme (53.66U/L) and in the blood content of glucose and fructosamine. The O.E.M. cactus cladodes caused lower (P=0.038) serum cholesterol content (41.33mg/dL). Regardless of the variety, there was a decrease (P=0.001) in the serum content of indirect bilirubin, urea, and sodium, and increase in the serum magnesium concentration. The partial replacement of the Tifton hay by Miúda or O.E.M. cactus cladodes in lamb feeding increases the enzyme activity, indicating liver and/or kidney changes, but does not cause relevant damage to energy, protein, and mineral metabolism.