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1
artículo
Publicado 2024
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In this study, chuño starch films were elaborated using acid hydrolysis, which was incorporated with different concentrations of eucalyptus essential oil (EEO). The reinforcement of the films was made by adding microfibers of Stipa obtusa (MFSO), a native Peruvian natural fiber rich in cellulose. The films were produced through the tape casting technique. The barrier properties presented swelling and solubility values of 1.478 and 0.439 g/g, respectively, at an optimal ratio of 7 % starch on a dry basis. An improvement in the modulus of elasticity of the films obtained was observed by incorporating concentrations of MFSO, starting at 0.55 %, in the polymeric matrix during the synthesis process. The FTIR spectra of the control film and the films reinforced with MFSO exhibited the same bands, due to the chemical similarities between starch and cellulose; micrographs of the reinforced film...
2
artículo
In Peru, there are two types of jewelry practice (industrial and artisanal) the second mentioned has a greater participation of people in this context the contribution is for the development of artisanal jewelry (handmade) carrying out a variety of operations with a very high incidence in the manual elaboration to obtain the product (jewel) for sale in the national market. Within the processing: initial step is with casting, in this area the analysis and follow-up was carried out to obtain the optimal and adequate alloy, in this procedure the phenomenon of the oxidation of the material (alloy) occurs, whose manifestation is the affirmation in the superficial part of the visible material, due to the lack of the inert system (zone without oxygen) necessary in it, to reduce the event, the lack of oxygen containment, does not contribute to the good surface presentation after casting, ultimat...
3
artículo
To adjust the parameters that influence the appearance of defects in the steel in the continuous casting mold, a particle swarm optimization algorithm (PSO) was developed using process models. The study considered multiple objectives with multiple restrictions and the results were compared with those reported by a teaching-learning-based optimization algorithm (TLBO). We conclude that the PSO has a good capacity to determine the parameters of the mold, and with it, it is possible to achieve an optimal solution without requiring great computational efforts.
4
artículo
To adjust the parameters that influence the appearance of defects in the steel in the continuous casting mold, a particle swarm optimization algorithm (PSO) was developed using process models. The study considered multiple objectives with multiple restrictions and the results were compared with those reported by a teaching-learning-based optimization algorithm (TLBO). We conclude that the PSO has a good capacity to determine the parameters of the mold, and with it, it is possible to achieve an optimal solution without requiring great computational efforts.
5
artículo
Publicado 2021
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In the present work, a mathematical model is developed which involves the equations of fluid mechanics and the energy equation to determine the temperature field of the liquid steel that enters a container to solidify, a situation commonly found in production processes of steel today. Using mathematical techniques, a simplified equation of the energy equation is obtained in which a non-dimensional parameter Pe, the Peclet number, allows to evaluate the transport of the heat by convection to the transmission by diffusion occurred in the mold that contains liquid steel. Using finite differences method, the mathematical model formulated is solved numerically to visualize the cooling process of the liquid steel, from the beginning until the solidification process starts. Likewise, the numerical computations are carried out using GNU-Octave, which is a platform to the scientific programming w...
6
artículo
Publicado 2021
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In the present work, a mathematical model is developed which involves the equations of fluid mechanics and the energy equation to determine the temperature field of the liquid steel that enters a container to solidify, a situation commonly found in production processes of steel today. Using mathematical techniques, a simplified equation of the energy equation is obtained in which a non-dimensional parameter Pe, the Peclet number, allows to evaluate the transport of the heat by convection to the transmission by diffusion occurred in the mold that contains liquid steel. Using finite differences method, the mathematical model formulated is solved numerically to visualize the cooling process of the liquid steel, from the beginning until the solidification process starts. Likewise, the numerical computations are carried out using GNU-Octave, which is a platform to the scientific programming w...
7
artículo
Publicado 1990
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In 1985, Tulio Halperín Donghi wrote an impressive summary of the latest achievements in the field of Latin American historiography. He highlighted the growing diversity of themes, methodologies, and interpretations that have been developed for a variety of regions and historical periods. Above all, he emphasized that enigmatic centuries such as those of the XVII and XIX, have been clarified. In addition, the historical work is increasingly enriched by the contributions of other disciplines such as anthropology, political science, and economics.
8
artículo
Improved wear resistance moderate abrasion gray cast iron 3.5% copper alloyed austempered at 300 ° C
Publicado 2012
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Manufacturing parts cast iron covers a very large field of machinery industry. These materials are iron-carbon alloys, with high percentages of carbon and designated under the name of foundries as this is the industrial process of manufacture thereof. The highest percentage of carbon makes the melting temperature of these is less than that of the steels and also a greater flow of liquid material is achieved which allows the filling of smaller thickness pieces of complex shapes and have improved castability . Moreover, the lower melting temperature allows the metal-mold interaction is less aggressive and thus can obtain a better surface quality parts. Its low cost, and this excellent castability, have led to extensive development of these alloys in applications such as engine blocks, shirts piston, gears, valve bodies, auto parts and many other parts for industrial use. The choice of mate...
9
artículo
Improved wear resistance moderate abrasion gray cast iron 3.5% copper alloyed austempered at 300 ° C
Publicado 2012
Enlace
Enlace
Manufacturing parts cast iron covers a very large field of machinery industry. These materials are iron-carbon alloys, with high percentages of carbon and designated under the name of foundries as this is the industrial process of manufacture thereof. The highest percentage of carbon makes the melting temperature of these is less than that of the steels and also a greater flow of liquid material is achieved which allows the filling of smaller thickness pieces of complex shapes and have improved castability . Moreover, the lower melting temperature allows the metal-mold interaction is less aggressive and thus can obtain a better surface quality parts. Its low cost, and this excellent castability, have led to extensive development of these alloys in applications such as engine blocks, shirts piston, gears, valve bodies, auto parts and many other parts for industrial use. The choice of mate...
10
tesis de grado
Publicado 2024
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El objetivo del presente trabajo de suficiencia profesional es, desarrollar el diseño de colada para la fabricación de los carros porta barrotes por fundición (Fundición Callao S.A), en acero de baja aleación ASTM A217-WC6, aplicando el software para la simulación de la solidificación de piezas "SolidCast". El procedimiento se basa en: modelado en el software SolidCast, simulación de la colada, análisis de resultados, ajustes y controles en la fabricación, mediante reportes de calidad (composición química, control dimensional, dureza, ensayo de tracción, ensayo metalográfico y líquidos penetrantes). Durante el proceso de fabricación de los carros porta barrotes por fundición, el diseño de colada final, es validado mediante reportes de controles de calidad, ensayos destructivos (ED) y ensayos no destructivos (END). Al desarrollar el diseño de colada final para la fabric...
11
artículo
Publicado 2012
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It seeks to develop a mathematical model that predicts the decay of the temperature of the liquid steel spoon 15 TM. The shots were made in temperature castings production, measuring the temperature after excoriated and before emptying the holding furnace, the time was also recorded between the two jacks temperature. Then the data obtained was analyzed to obtain the parameters of the particular model (K and T0). The derivation of the model was obtained from an Ordinary Differential Equation (ODE) homogeneous. Prognostic value of the model obtained with new values measured temperature was compared. To make the prognosis of two different values of temperature T0, one with a constant value of T0, as shown in the model found, and another with T0, a variable that was numerically equal to the temperature after excoriated were used, both forecasts were compared with various indicato...
12
artículo
Publicado 2012
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It seeks to develop a mathematical model that predicts the decay of the temperature of the liquid steel spoon 15 TM. The shots were made in temperature castings production, measuring the temperature after excoriated and before emptying the holding furnace, the time was also recorded between the two jacks temperature. Then the data obtained was analyzed to obtain the parameters of the particular model (K and T0). The derivation of the model was obtained from an Ordinary Differential Equation (ODE) homogeneous. Prognostic value of the model obtained with new values measured temperature was compared. To make the prognosis of two different values of temperature T0, one with a constant value of T0, as shown in the model found, and another with T0, a variable that was numerically equal to the temperature after excoriated were used, both forecasts were compared with various indicato...
13
tesis de grado
Publicado 2024
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This study investigates the antimicrobial and water vapor barrier properties of biodegradable films made from potato (Solanum tuberosum) waste starch and the natural additives glycerol, propolis, and montmorillonite ("chaco"). Films were produced using the casting method, and their physical, antimicrobial, and barrier properties were analyzed. Film compositions were established using an experimental design of mixtures. The water vapor permeability values ranged from 0.44 × 10−10 to 8.55 × 10−10 g/(m·s·Pa). The permeation energy was lower than that of polyvinyl chloride and polypropylene films but higher than that of cellophane films. The solubility values ranged from 58 to 66%, and the tensile modulus ranged from 2.15 to 5.15 MPa. The largest inhibition halo diameter obtained for Staphylococcus aureus was 17 mm. The developed packages completely biodegrade within 30 days under co...
14
artículo
2020RESUMENEste artículo aborda la experiencia de diseño y aplicación del podcast Relatos de Gestión en los cursos Gestión Pública y Social de la Facultad de Gestión y Alta Dirección de la Pontificia Universidad Católica del Perú (PUCP). Para ello, se presentan las fases que implicó el diseño de cada uno de los episodios, la elección del formato y las plataformas que empleó el podcast, así como el proceso de diseño de las clases y los elementos de evaluación en los que se utilizó el podcast. También se muestran las actividades que se desarrollaron para la sistematización de la experiencia y, finalmente, las reflexiones sobre los beneficios de la experiencia en los aprendizajes de los estudiantes.
15
artículo
Publicado 2021
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The main challenge we face is to know how to design and implement corporate environmental management systems able to promote and reconcile multiple interests of social and economic actors to avoid environmental conflicts that way. We believe that better articulating the dynamics of resistance, now dispersed and fragmented, offering opportunities to autonomy, which effectively treat the conflict as a function of social arrangements, it could prevent the seams of this precarious institutional tearing further. If the claims in question requires a change in the distribution of benefits and privileges that exist in a community, the institutions put in place mechanisms of power, designed to stifle even before either expressed or, upon agreement, you could try to delete it before it gains access to relevant decision-making arena. The managers' differences and quell social conflicts, are the ins...
16
tesis de maestría
Publicado 2020
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The presented work demonstrates the process of designing a cheap, low cost three axis force sensor. Further it describes its integration in an array of multiple sensors to measure the distribution of forces acting on the sole of a prosthetic foot. The focus will be on easy manufacturing and common materials since the sensor will be integrated in a low cost prosthesis for lower limp amputees. Using the knowledge from bio mechanics and some basic assumptions for the later use, requirements for the project are derived. After a presentation of some state of the art sensor principles, suitable concepts are collected. Than, the concepts are compared using a comparison table to find the one the fits the requirements the best. A very compelling concept using barometers casted in silicone rubber is tested using a simple prototype to try out whether it is a good candidate or not. The tests show th...
17
tesis de maestría
Publicado 2020
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The presented work demonstrates the process of designing a cheap, low cost three axis force sensor. Further it describes its integration in an array of multiple sensors to measure the distribution of forces acting on the sole of a prosthetic foot. The focus will be on easy manufacturing and common materials since the sensor will be integrated in a low cost prosthesis for lower limp amputees. Using the knowledge from bio mechanics and some basic assumptions for the later use, requirements for the project are derived. After a presentation of some state of the art sensor principles, suitable concepts are collected. Than, the concepts are compared using a comparison table to find the one the fits the requirements the best. A very compelling concept using barometers casted in silicone rubber is tested using a simple prototype to try out whether it is a good candidate or not. The tests show th...
18
artículo
Publicado 2023
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The design and development of efficient and electrocatalytic sensitive nickel oxide nanomaterials have attracted attention as they are considered cost-effective, stable, and abundant electrocatalytic sensors. However, although innumerable electrocatalysts have been reported, their large-scale production with the same activity and sensitivity remains challenging. In this study, we report a simple protocol for the gram-scale synthesis of uniform NiO nanoflowers (approximately 1.75 g) via a hydrothermal method for highly selective and sensitive electrocatalytic detection of hydrazine. The resultant material was characterized by scanning electron microscopy, X-ray photoelectron spectroscopy, and X-ray diffraction. For the production of the modified electrode, NiO nanoflowers were dispersed in Nafion and drop-cast onto the surface of a glassy carbon electrode (NiO NF/GCE). By cyclic voltammet...
19
artículo
Publicado 2023
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The design and development of efficient and electrocatalytic sensitive nickel oxide nanomaterials have attracted attention as they are considered cost-effective, stable, and abundant electrocatalytic sensors. However, although innumerable electrocatalysts have been reported, their large-scale production with the same activity and sensitivity remains challenging. In this study, we report a simple protocol for the gram-scale synthesis of uniform NiO nanoflowers (approximately 1.75 g) via a hydrothermal method for highly selective and sensitive electrocatalytic detection of hydrazine. The resultant material was characterized by scanning electron microscopy, X-ray photoelectron spectroscopy, and X-ray diffraction. For the production of the modified electrode, NiO nanoflowers were dispersed in Nafion and drop-cast onto the surface of a glassy carbon electrode (NiO NF/GCE). By cyclic voltammet...
20
artículo
Publicado 2022
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Between the harsh seasons and inclement weather, forgotten and devoid of teachers, transportation, modern infrastructure and educational materials, reaching the field-schools of the mountains can take hours of steep walking for primary school children and small infants, in which the difficulties of rural areas and the hardness of the height may not be the greatest challenge of all. Well, without any privilege, crossing hills and mountains, they are boys and girls who come out of nowhere to conquer everything. From this premise, the study proposes to enlarge the relationship between School-Mountain (MS) in order to forge not only a renewed notion or real line that allows responding to the current dilemmas and challenges of the time, but also allows finding some action engines cast and forged from the heart of the mountain, one that has the ability and spirit to slay the killer. In this wa...
