UTN -FRC -Producción Académica de Investigación y Desarrollo - Comunicaciones a Congreso
Permanent URI for this collectionhttp://48.217.138.120/handle/20.500.12272/2433
Browse
99 results
Search Results
Item Experimento para evaluar el uso de patrones de negocio para facilitar la comprensión del modelo conceptual de un sistema de gobierno electrónico(2022) Medina, Oscar Carlos; Genero Bocco, Marcela Fabiana; Marciszack, Marcelo Martín; Bratti, Alicia Gabriela; Strub, AnaLos patrones son reconocidos como modelos exitosos que favorecen la reusabilidad, y es una de sus características, facilitar la comprensión de un modelo. Este artículo describe un experimento cuyo objetivo es corroborar si el uso de patrones de negocio mejora la comprensión del modelo conceptual de un sistema de gobierno electrónico. El experimento se realizó en el año 2021 con 33 estudiantes del tercer curso de la carrera de Ingeniería en Sistemas de Información. Los resultados obtenidos evidencian que existen diferencias significativas en favor a la efectividad de la comprensión del modelo conceptual al utilizar patrones de negocio. En cambio, no hay diferencias relevantes en la eficiencia al utilizar, o no, patrones.Item Experiencia de investigación, formación y extensionismo en tecnologías blockchain desde una universidad(2022) Medina, Oscar Carlos; Marciszack, Marcelo Martín; Romero, Rubén Anibal; Della Mea, KarenEste trabajo describe el trayecto realizado en una Universidad pública nacional para incorporar Blockchain en las actividades de investigación, educación continua y mentoreo de emprendimientos tecnológicos. Con el propósito de estudiar, evaluar y transferir resultados de proyectos Blockchain en las líneas de investigación que se consideran más disruptivas como plataforma para la denominada Economía del Conocimiento se creó un Laboratorio de Blockchain radicado dentro de un centro de investigación de Ingeniería en Sistemas de Información. Desde este espacio se promovió la investigación científica y los trayectos formativos de educación continua sobre modelado, desarrollo y divulgación de tecnologías Blockchain. También se llevaron a cabo acciones de vinculación y extensionismo a emprendimientos cuya propuesta de valor tiene como núcleo una aplicación descentralizada implementada con Blockchain. De acuerdo a los resultados alcanzados se prevé un crecimiento, en integrantes y proyectos, a mediano plazo, la incorporación gradual de Blockchain en la currícula formal y la consolidación de un modelo de trabajo que permita su escalabilidad y replicación en otras universidades latinoamericanas.Item Estudio de mapeo sistemático sobre ontologías de usabilidad temprana en elicitación de requerimientos para sistemas web(2022) Paz Menvielle, María Alejandra; Meloni, Brenda Elizabeth; Garnero, Ana Belén; Ligorria, Karina Paola; Marciszack, Marcelo Martín; Moreno, Juan CarlosEn este trabajo se presentan los resultados finales y conclusiones de la ejecución de un estudio de mapeo sistemático (Systematic Mapping Study: SMS) de la literatura, con el fin de determinar si se han desarrollado ontologías de usabilidad para sistemas web que sean aplicables a la etapa temprana de elicitación de requisitos como parte del proceso de desarrollo de software, o si es necesario elaborarla. Actualmente el volumen de publicaciones científicas en relación a la usabilidad, su análisis y aplicación con el objetivo de mejorar la interacción de los usuarios con los sistemas se encuentra en constante crecimiento y viene cobrando relevancia dentro de la ingeniería de software. Las fuentes consultadas nos permiten concluir que no se han realizado publicaciones en que se desarrollen o utilicen ontologías de usabilidad temprana. Es por ello que decidimos abordar esta temática que constituye el objetivo central del proyecto de investigación en el cual se encuentra enmarcado este trabajo.Item HaP / LP-SBA-15 Nanocomposite for efficient removal of fluoride from contaminated wáter(2020) López, Claudia G.; Anunziata, Oscar A.; Cussa, JorgelinaHydroxyapatite (HaP) composites and highly ordered large pore mesoporous silica, such as LP-SBA-15 (Large Pore-SBA-15), were developed, characterized by XRD, BET, FTIR and HRTEM, and applied properly to fluoride removal from contaminated water. The proposed procedure to prepare HaP/LP-SBA-15 was successful, which acts as supports to anchor the HaP crystals, in nanometer-scale (<12 nm), with higher fluoride retention from contaminated water. The free OH- groups of HaP nanocrystals, inside the host, permitted fluoride retention with high capacity. The fluoride holding activity was over 3 orders of magnitude higher than pure HaP.Item Mesopore carbón starch with acid properties: synthesis and characterization(2020) Martínez, María Laura; Anunziata, Oscar A.We have shown that a promising material with acidic properties can be successfully prepared from starch mesoporous carbon (SMC), functionalized with sulfated zirconia. The process of assembling P123, starch, zirconia, and silicon synthesized Zr-modified ordered mesoporous carbon. SMC and Zr-SMC were characterized by BET for their texture properties and, using Scanning Electron Microscopy (SEM), their morphology. Acidic properties were acquired by programmed thermodesorption of ammonia (NH3 TPD). These studies show that the Zr-SMCs material is mainly composed of mesopores with an average pore size of approximately 3.5 nm, high surface area and pore volume, and has medium to strong acidity properties.Item Super-acid sulfated/zirconium-containig nanostructured carbons(2020) Martínez, María Laura; Anunziata, Oscar A.In this work, we report the successful preparation of a superacid mesoporous carbon functionalized with sulfated zirconia (SZr-C). SZr-C has a surface area of approximately 1300 m2 g-1, and the total pore volume of 0.94 cm3g-1, composed mainly of mesoporous with an average pore size of 3.5 nm. The composition of the surface and the chemical states of the elements did reveal Zr isolated species. According to the data collected by infrared spectroscopy (FTIR), of pyridine desorbed at various temperatures, the total number of acidic sites was 2.36 mmol/g and the distribution in weak- medium, strong and super acidic sites was determined. The activity in the methylation of aniline indicated that the acid sites are strong, and have not redox properties.Item Synthesis and characteristics of magnetite containing-cmk-3 and its application in hydrogen storage(2020) Juárez, Juliana M.; Venosta, Lisandro F.; Gómez Costa, Marcos B.; Anunziata, Oscar A.In this work, we report the synthesis and characterization of iron oxide nanoparticles (Magnetite) supported on CMK-3. The materials were characterized by XRD, SEM, TEM, XPS and magnetization studies. A large amount of the iron incorporated as iron oxide nanoparticles was in the magnetite phase. The incorporation of magnetite on the CMK-3 carbon surface significantly improved the hydrogen storage capacity (4.45 wt. % at 77 K and 10 bar) compared to the CMK-3 structure (2.20 wt% at 77 K and 10 bar). Magnetite nanoparticles play a key role in H2 adsorption.Item Superacid mesoporous carbón base don sulfated Zr(2020) Anunziata, Oscar A.; Martínez, María LauraIn this brief communication we report the successful preparation of a promising material with acidic properties from starch-derived mesoporous carbon (SMC), functionalized with sulfated zirconia. The process of assembling P123, starch, zirconia and silicon produces ordered mesoporous carbon modified with Zr. Reaction time and temperature are essential to avoid the appearance of poorly assembled or unsightly structures, reducing the surface area and the size of the pores. Zr-SMC has a surface area of approximately 1300 m2 g-1, and the total pore volume of 0.94 cm3 g-1, composed mainly of mesopores with an average pore size of 3.5 nm. The composition of the surface and the chemical states of the elements did not reveal ZrO2 as isolated clusters. Through the thermodesorption of the pre-adsorbed ammonia in the sulfated Zr-SMC, the total ammonia retained is 1.80 mmol / g at high temperature, exhibiting medium to strong acidity.Item Multiple-wall carbón nanotubes obtained with mesoporous material decorated with cerio-zirconium(2020) Martínez, María Laura; Anunziata, Oscar A.In this work, Ce-Zr-SBA-15 has been used directly as a catalyst for the synthesis of multi-vall carbon nanotubes (MWCNT) through Chemical Vapor Deposition (CVD). In addition to cerium oxide, it contains zirconium oxide Nano crystallites, which act as catalysts for carbon nanostructures. The catalytic performance of this material was evaluated for the decomposition of ethanol at 900 °C, with N2 flow. The structural characterization of the resulting catalyst was carried out by means of SEM and XRD. The decomposed carbon of absolute ethanol diffuses through the surface of the nanostructured material and precipitates in carbon structures called multiple-walled nanotubes, which could be visualized/detected/identified by TEM, showing diameters of the carbon nanotubes that range from 15 to 25 nm.Item Direct synthesis and characterization of mesoporous carbon CMK-3 modified with zirconia applied in energy storage(2020) Venosta, Lisandro F.; Gómez Costa, Marcos B.; Juárez, Juliana M.; Anunziata, Oscar A.In this work, we report the synthesis and characterization of the nanostructured carbon material (CMK- 3) modified with zirconium oxide synthesized by a new direct synthesis technique. The aim of this new synthesis method is to avoid the use of inorganic siliceous template (SBA-15), which leads to a shorter and cheaper way to obtain mesoporous carbon, and at the same time incorporate into the framework Zirconium atoms. Zirconium oxide dispersed in carbon materials (Zr-CMK-3) were successfully synthesized and characterized by X-ray diffraction, textural properties, UV-Vis-DRS, XPS, and transmission electron microscopy analysis. This material is promising in the application of hydrogen adsorption for energy storage. Zr-CMK-3 material significantly improved H2 storage behavior (4.6% by weight at 77 K and 10 bar) compared to CMK-3 support. The synthesized material is promising in the absorption of hydrogen by weak bonding forces (physisorption). A hydrogen adsorption mechanism was proposed and the role of the Zr+4 cation in hydrogen absorption was discussed. The activity of the samples to the adsorption of hydrogen molecules is attributed to the improved dispersion of the zirconium oxide, as well as the appropriate use of support, which can probably disperse the zirconium on its large surface area, allowing a great dispersion of the zirconium. The Zr+4 cation is an active species to absorb and store hydrogen through a physisorption process and the carbon plays an important role in the dispersion and size of metal particles. A hydrogen storage mechanism on the active surface of the ZrO2 clusters was proposed. First layer of hydrogen molecules can react with the metal cation through a dihydrogen complex (Kubas interaction) [1]. The second layer of hydrogen molecules adsorbed around the metal oxide clusters is due to dipole-like interactions, this is because the metal particle induces dipole forces on the hydrogen molecule. The other layers could also interact by dipole forces; however, the interaction force decreases as the distance to the surface increases. The interaction of the induced dipole in a second layer adsorbs more hydrogen molecules because the strong interaction of the metal particles takes up dipole-induced forces on the hydrogen molecules. The upper layers could interact with the metal cation by dipole-induced bonding; however, the interaction force decreases as the distance to the surface increases. The procedure for this adsorption is still under investigation and optimization. The hydrogen storage behavior in Zr-CMK-3 can be optimized by controlling the size of the metal particles, the dispersion and the nature of the support.