Mostrando ítems 1-20 de 419

Indicadores de alerta temprana de vulnerabilidad macroeconómica

Giraldo, Jorge Alberto (Revista EIA - Fondo EditorialAdministrativa, Financiera, Sistemas y ComputaciónEnvigado (Antioquia, Colombia), Universidad EIA, 2008, 2008)

Las crisis financieras generan efectos macroeconómicos nocivos que terminan por afectar el nivel de vida de la mayoría de la población. La identificación, prevención o minimización de sus efectos es tarea de las ...
Desarrollo de un sistema de audición vibrotáctil para el acceso a la música: Fase I

Villa-Moreno, A. (Adriana); García-Quiroz, F. (Felipe); Castaño-Jaramillo, P. (Paula); Londoño-Jaramillo, N. (Nathalia) (Biomédica, Mecatrónica y MecánicaFondo Editorial EIAUniversidad CES, 2013-09-26)

The sense of touch transmits not only isolated tactile sensations also information that can be processed at the cerebral cortex in a similar way as it is in the brain areas for audition or vision. Both vibratile and ...
Lecciones del concurso de puentes EIA

Duque-Uribe, M. P. (Maria del Pilar) (Unidad Académica Civil, Ambiental Geológica e IndustrialFondo Editorial EIA, 2013-10-21)

The history, evolution and experience of the bridge contest carried out every year by the Antioquia School of Engineering (EIA) is exposed. The basic structural systems used for bridges are described, the weak points of ...
Tecnologías de tratamiento para la tierra Fuller contaminada con aceite dieléctrico

Berrío-Giraldo, L. I. (Linda Ivette); Agudelo, E. A. (Édison Alexánder); Cardona-Gallo, S. A. (Santiago Alonso) (Fondo Editorial EIA, 2013-10-22)

In recent years, Colombia has been implementing agreements and regulations for the proper handling and final disposal of hazardous waste, because the amount generated each time is increasing and the adverse impact that ...
Implementación de un sistema de medición de temperatura empleando fibra óptica para el estudio térmico de transformadores de distribución inmersos en aceite mineral y vegetal

Navas, D. F. (Diego Fernando); Cadavid-Ramírez, Héctor; Echeverry-Ibarra, Diego Fernando (Fondo Editorial EIA, 2013-10-22)

Transformers are elements of the utmost importance in the layout of power grids. Their usable lifespan depends on various factors, amongst them, the temperature within their own interior, specially the localized temperature ...
Remoción de níquel y DQO presentes en las aguas residuales de la industria automotriz mediante electrocoagulación

Gonzalez-Silva, G. (German); Valencia, S. H. (Sergio Humberto) (Fondo Editorial EIA, 2013-10-22)

By means of this study was determined if the electrocoagulation technique helps to minimize the nickel and organic matter, chemical oxygen demand (COD) concentration, present in wastewaters from automotive industry. A ...
Why animals come together, with the special case of mixed-species bird flocks

Colorado, Gabriel Jaime (Fondo Editorial EIA, 2013-10-23)

El comportamiento de agrupamiento es un fenómeno biológico global y ubicuo en el reino animal que ha atraído considerable atención en muchos contextos. Los dos factores principales que se cree favorecen la vida en grupo ...
Determinación del color del exocarpio como indicador de desarrollo fisiológico y madurez en la guayaba pera (psidium guajava cv. guayaba pera), utilizando técnicas de procesamiento digital de imágenes

Castro-Camacho, J. K. (Jennifer Katiusca); Cerquera-Peña, N. E. (Néstor Enrique); Gutiérrez-Guzmán, Nelson (Fondo Editorial EIA, 2013-10-23)

The colorimetric coordinates analysis of digital images in samples pear guava fruits (Psidium guajava cv. Pear guava) was performed for three times of harvest: traditional harvesting at 120 days after flowering (T1), early ...
Desarrollo e implementación de un modelo de teoría de restricciones para sincronizar las operaciones en la cadena de suministro

Marín-Marín, W. (William); Gutiérrez-Gutierrez, E. V. (Elena Valentina) (Fondo Editorial EIA, 2013-10-23)

This paper presents a methodological and practical proposal to synchronize the logistic operations and decisions in a Colombian ceramic tile supply chain. For doing so, we used two tools from the Theory of Constraints ...
Impacto del material reciclado en los inventarios de materias primas de una empresa manufacturera

Salinas-López, G. A. (Guillermo Antonio); Victoria-Moreno, A. (Anthony); Osorio, J.C. (Juan Carlos) (Fondo Editorial EIA, 2013-10-23)

In this paper, a system dynamics model is designed. This model, together with some management indicators is used to measure the impact of recycled material in an industry. This, in order to provide best elements in decision ...
Evaluación ambiental para procesos que usan residuos de la industria de los biocombustibles como materias primas

Valencia-Botero, M. J. (Mónica Julieth); Cardona, Carlos Ariel (Fondo Editorial EIA, 2013-10-24)

The industry of biofuels generates a lot of amounts of residues, which could be used to produce added-value products. In this work, a Life Cycle Assessment (LCA) methodological approach was used in the cases of glycerol ...
Síntesis y caracterización de óxidos mixtos de sílice-titania preparados por método sol-gel y tratamiento hidrotérmico

Pabón, Elizabeth; Borja-Ordóñez, S. M. (Sandra Milena); Ordóñez-Loza, J. (Javier); Ramírez-Vélez, A. (Alejandro) (Fondo Editorial EIA, 2013-10-25)

Mixed oxides SiO2-TiO2 were prepared of different compositions by the sol-gel method combined with hydro-thermal treatment (HT), using tetraethylorthosilicate and titanium tetraisopropoxide as precursors of the sources ...
Laboratory evaluation of compactability and performance of warm mix asphalt

Álvarez, Allex E.; Aaron-Pimienta, A. L. (Aixa Leonor); Kirby-Estakhri, C. (Cindy) (Fondo Editorial EIA, 2013-10-25)

Mezclas asfálticas tibias (MAT) es el término empleado para describir el conjunto de tecnologías que permiten la fabricación de mezclas asfálticas a menores temperaturas que las especificadas para mezclas asfálticas en ...
Influencia de la relación masa/área en las propiedades de cerámicas de PZN-5PT-5BT

Villaquiran, C. F. (Claudia Fernanda) (Fondo Editorial EIA, 2013-10-28)

0,90Pb(Zn1/3Nb2/3)O3–0,05PbTiO3-0,05BaTiO3 (PZN-5PT-5BT) ceramic powders, with majority perovskite phase, were synthesized using the columbite method. These powders were shaped into cylindrical pellets, which had two ...
Control de fasciola hepatica en el agua de consumo animal a través de filtración rápida y lenta

González-Morales, C. (Carolina); Sánchez, G. A. (Gladys Adriana); Castro-Jiménez, C. C. (Camilo César); Gómez-Carmona, C. (Catalina) (Fondo Editorial EIA, 2013-10-28)

The bovine fasciolosis is a zoonosis caused by Fasciola hepatica transmitted by consuming water and / or vegetables contaminated with the digenea. This disease causes significant economic losses in the dairy producer regions ...
Influencia de los recubrimientos dúplex sobre las propiedades mecánicas y resistencia al desgaste del acero AISI 4140 bonificado

Bolívar-Osorio, F. J. (Francisco Javier); Bejarano-Gaitán, G. (Gilberto); Gómez-Botero, M. A. (Maryory Astrid) (Fondo Editorial EIA, 2013-10-28)

The AISI 4140 steel is a low chrome/molybdenum alloyed steel with high tensile strength and good toughness, which is normally used for the manufacture of machine parts such as gears, crank shafts, camshafts, etc. However, ...
Metodología basada en los algoritmos Vega y Moga para solucionar un problema multiobjetivo en un sistema de producción job shop

Coca-Ortegón, G. A. (Germán Augusto); Castrillón, Omar Danilo; Ruiz-Herrera, S. (Santiago) (Fondo Editorial EIA, 2013-10-29)

This paper presents a methodology that aims to minimize simultaneously, in a “Jo b Shop” production system the following variables: process time (makespan time), cost of direct labor and also the fraction defective generated ...
Modelo de laboratorio de prospectiva en gerencia para la Escuela de Ingeniería de Antioquia —EIA—

Botero-Tobón, R. D. (Rubén Darío); Calle-Zapata, V. (Vladimir); Echavarría-Goicochea, M. V. (María Victoria); Galindo-Monsalve, R. (Rafael); Osuna-Ramírez, S. A. (Sergio Andrés) (Fondo Editorial EIA, 2013-10-29)

This paper presents a proposal of a model for the creation of a center of foresight in management at EIA. This proposition is based on the identification of the needs of organizations to understand the future, as a result ...
Resistencia al desgaste erosivo-corrosivo de aceros austeníticos fermanal

Aperador, W. (William); Bautista, J. H. (Jorge Hernando); Betancur, J. D. (Juan David) (Fondo Editorial EIA, 2013-11-05)

We obtained austenitic alloys of the Fe-Mn-Al, Fe in the range (4.9~11.0 wt% Al) - (17.49~34.3 wt% Mn) -(0, 43 ~ 1.25 wt% C), which were melted in an induction furnace from high purity materials. The alloys were evaluated ...
Efecto del contenido de carbono sobre la resistencia al desgaste abrasivo de recubrimientos de CrC depositados por pulverización catódica magnetrón

Gómez-Botero, M. A. (Maryory Astrid); Lousa, A. (Arturo); Esteve, J. (Joan) (Fondo Editorial EIA, 2013-11-05)

Chromium carbide coatings on steel are a good candidate for applications on forming and molding dies. The high mechanical strength, chemical resistance and high temperature stability of Cr3C2 phase can be compatible with ...

Envíos recientes

Indicadores de alerta temprana de vulnerabilidad macroeconómica
...
Giraldo, Jorge Alberto | 2008

Las crisis financieras generan efectos macroeconómicos nocivos que terminan por afectar el nivel de vida de la mayoría de la población. La identificación, prevención o minimización de sus efectos es tarea de las autoridades económicas, que utilizan distintas herramientas de diagnóstico. En este artículo se explica la metodología de Goldstein, Kaminsky y Reinhart para construir un sistema de indicadores de alerta temprana de crisis financieras, que introduce conceptos innovadores para la realización del análisis y, además, está diseñada para ser aplicada en los países considerados mercados emergentes.

LEER
Desarrollo de un sistema de audición vibrotáctil para el acceso a la música: Fase I
...
Villa-Moreno, A. (Adriana) | 2013-09-26

The sense of touch transmits not only isolated tactile sensations also information that can be processed at the cerebral cortex in a similar way as it is in the brain areas for audition or vision. Both vibratile and electrical stimuli have been used for tactile stimulation devices, and the former was chosen for the system presented. The tactile auditory-substitution systems have focused on communication skills, but this work pretends the construction of a device for developing musical and artistic skills. These should be reflected in the capacity to identify musical pieces through tactile stimulation. The graphical user interface of the system was programmed using the virtual instrumentation software LabVIEW 7.0. It includes tools for the learning of the system, which were developed to help increasing the sensitivity of the user. Besides, to ensure a clear association with music theory and acoustic concepts some visual feedback systems were implemented

LEER
Lecciones del concurso de puentes EIA
...
Duque-Uribe, M. P. (Maria del Pilar) | 2013-10-21

The history, evolution and experience of the bridge contest carried out every year by the Antioquia School of Engineering (EIA) is exposed. The basic structural systems used for bridges are described, the weak points of every system are brought out and some of the contest models are analyzed, according to their structural system, in the way they fault. At last, winner bridges of the four versions of the event are described, and a study of how, through experience, the contestants and organizers had attained and raised the level of contest is exposed.

LEER
Tecnologías de tratamiento para la tierra Fuller contaminada con aceite dieléctrico
...
Berrío-Giraldo, L. I. (Linda Ivette) | 2013-10-22

In recent years, Colombia has been implementing agreements and regulations for the proper handling and final disposal of hazardous waste, because the amount generated each time is increasing and the adverse impact that these residues in human health and environment. The Fuller earth is an inorganic adsorbent material (mainly aluminosilicate mineral) used in the electrical industry for the regeneration of dielectric oil, a derivative of petroleum used as an electrical and thermal insulation in power transformers. After oil regeneration process, the content of polyaromatic hydrocarbons (or PAH’s by its initials in english) that has Fuller earth it become a hazardous waste that requires proper treatment to reduce its pollution and allows its reuse or safely dispose in a landfill.

LEER
Implementación de un sistema de medición de temperatura empleando fibra óptica para el estudio térmico de transformadores de distribución inmersos en aceite mineral y vegetal
...
Navas, D. F. (Diego Fernando) | 2013-10-22

Transformers are elements of the utmost importance in the layout of power grids. Their usable lifespan depends on various factors, amongst them, the temperature within their own interior, specially the localized temperature on their insulating material components. Such temperatures are usually approximated through proposed guideline models, however, as stated, these values are approximations and realtime direct measurements would be much more desirable. Due to purely economic reasons, direct measurement is often used for power transformers. However, in the advent of “Smart Grids” distribution system instrumentation will be necessary, as well as the use of cleaner technologies. For research purposes, in this paper, the authors will discuss their experiences in instrumentation with optical fibers in four different distribution transformers submerged in mineral and vegetable oil, for thermal evaluation. The transformers have capacities that range from 15 kVA to 37,5 kVA and operate at voltages of 7620 V / 240 V. This paper also explains the process of identifying which are the optimal temperature measurement points in the interior of the transformer and leads into the results of temperature rise tests with simulated loads through the use of short circuits and through constant reference fault and actual load at two levels to compare measurements within each of the transformers.

LEER
Remoción de níquel y DQO presentes en las aguas residuales de la industria automotriz mediante electrocoagulación
...
Gonzalez-Silva, G. (German) | 2013-10-22

By means of this study was determined if the electrocoagulation technique helps to minimize the nickel and organic matter, chemical oxygen demand (COD) concentration, present in wastewaters from automotive industry. A randomized multilevel factorial experimental design was used; being the current density and reaction time evaluated in three levels, while the separation between electrodes was analyzed at two levels. Electrocoagulation was carried out in a batch reactor using iron electrodes with monopolar arrangement. The acid digestion, atomic absorption air-acetylene flame and the closed reflux-colorimetric (micro COD) analytical techniques were used to determine the content of the contaminants. The conditions where it got the most decontamination of the water analyzed were found; being the Applied current density: 1,04 A/dm2, operative time: 17 minutes y; did not the electrode separation influence. The results show that electrocoagulation could be effective to reduce nickel and organic matter (COD) present in wastewaters from automotive industry.

LEER
Why animals come together, with the special case of mixed-species bird flocks
...
Colorado, Gabriel Jaime | 2013-10-23

El comportamiento de agrupamiento es un fenómeno biológico global y ubicuo en el reino animal que ha atraído considerable atención en muchos contextos. Los dos factores principales que se cree favorecen la vida en grupo son la disponibilidad de alimento y la presencia de predadores. En esta revisión se exploraron las principales teorías publicadas en la literatura que tratan de dar explicación al comportamiento de agrupamiento en animales. Esta revisión se divide en dos secciones. Inicialmente, se describen las principales teorías así como los potenciales mecanismos asociados al beneficio de agruparse. Posteriormente, se presenta un caso especial en un sistema social animal llamado bandadas mixtas de especies de aves, explorando la información disponible en relación a las causas potenciales que hacen que las aves se asocien en esta particular agregación.

LEER
Determinación del color del exocarpio como indicador de desarrollo fisiológico y madurez en la guayaba pera (psidium guajava cv. guayaba pera), utilizando técnicas de procesamiento digital de imágenes
...
Castro-Camacho, J. K. (Jennifer Katiusca) | 2013-10-23

The colorimetric coordinates analysis of digital images in samples pear guava fruits (Psidium guajava cv. Pear guava) was performed for three times of harvest: traditional harvesting at 120 days after flowering (T1), early harvesting at 112 days after flowering (T2) and, early harvesting at 110 days after flowering (T3), the three group of samples were stored at environmental conditions at a temperature of 26 ºC and 58% of relative humidity and under refrigeration at 7.5 ºC and 85% relative humidity. For color determination two color spaces were used: RGB and CIE-L*a*b*, each of these spaces describes the color of the skin using three components that allow the comparison of its evolution during each step of postharvest. The results showed a typical evolution from deep green, freshly harvested, to light green yellowish colors. The found coordinates allow the reproduction of the colors of the evolution of ripening in printing devices configured in RGB coordinates. From the physicochemical parameters assessed, the respiration rate of the fruit is the most correlated with the change of color during the post-harvest stage.

LEER
Desarrollo e implementación de un modelo de teoría de restricciones para sincronizar las operaciones en la cadena de suministro
...
Marín-Marín, W. (William) | 2013-10-23

This paper presents a methodological and practical proposal to synchronize the logistic operations and decisions in a Colombian ceramic tile supply chain. For doing so, we used two tools from the Theory of Constraints methodology (TOC): the first one refers to the operations synchronization along the supply chain through the so-called method Drum-Buffer-Rope; the second one refers to the development of an accounting tool that allows improving the decision making for each member of the supply chain (Throughput Accounting). The results of the implementation show that an integral analysis of the supply chain could improve the global performance metrics such as service level, production plans fulfillment, inventory costs of raw materials and finished goods, and the company productivity.

LEER
Impacto del material reciclado en los inventarios de materias primas de una empresa manufacturera
...
Salinas-López, G. A. (Guillermo Antonio) | 2013-10-23

In this paper, a system dynamics model is designed. This model, together with some management indicators is used to measure the impact of recycled material in an industry. This, in order to provide best elements in decision making process related to the management of raw materials stocks. For this purpose, a review of the main elements that influence the production plan of a business case study is performed. Thus, a characterization of the industry and subsequent configuration of the structure and relationships of the system is obtained, in order to model and simulate using the software Vensim DSS. From these simulations, a review and analysis of the system behavior, as well as variations proposed, in different scenarios and changes in relevant parameters, is executed. At the end, a model that illustrates the behavior of inventory levels of different types of materials as well as the values of some logistics and energy indicators is obtained, revealing the important work ahead in recycling on the region of Valle del Cauca, Colombia.

LEER
Evaluación ambiental para procesos que usan residuos de la industria de los biocombustibles como materias primas
...
Valencia-Botero, M. J. (Mónica Julieth) | 2013-10-24

The industry of biofuels generates a lot of amounts of residues, which could be used to produce added-value products. In this work, a Life Cycle Assessment (LCA) methodological approach was used in the cases of glycerol and sugarcane bagasse during their productions and their uses as raw materials in four different processes. The aim of this work was to determine the environmental impact of those processes, by calculating the Greenhouse Gases (GHG) associated to their lifecycles. The results indicated that the GHG emissions from glycerol processes were larger than processes involving sugarcane bagasse. Nevertheless, the processes using glycerol as raw material could be considered as more efficient, since the GHG emissions associated with the glycerol use per mass unit were 75% lower than GHG emissions when the glycerol is used, with regard to sugarcane bagasse.

LEER
Síntesis y caracterización de óxidos mixtos de sílice-titania preparados por método sol-gel y tratamiento hidrotérmico
...
Pabón, Elizabeth | 2013-10-25

Mixed oxides SiO2-TiO2 were prepared of different compositions by the sol-gel method combined with hydro-thermal treatment (HT), using tetraethylorthosilicate and titanium tetraisopropoxide as precursors of the sources silica and titanium, respectively. Hybrids obtained using the nonionic surfactant Triton X100, were carried out with TH for 48 hours at 120 °C, washed, dried at 70 °C/24 h, and calcined at 550 °C/2 h (heating rate 1 °C/min.). The mixed oxides were characterized by nitrogen physisorption, SEM, TEM, FTIR, XRD and TGA. The results indicate that the materials presented high specific surface area in the range of 190-805 m2/g, average pore diameter 4,0- 6,5 nm, additionally, the silica-titania mixed oxides exhibits anatase phase desirable in photocatalytic reactions.

LEER
Laboratory evaluation of compactability and performance of warm mix asphalt
...
Álvarez, Allex E. | 2013-10-25

Mezclas asfálticas tibias (MAT) es el término empleado para describir el conjunto de tecnologías que permiten la fabricación de mezclas asfálticas a menores temperaturas que las especificadas para mezclas asfálticas en caliente (MAC) convencionales. Esta reducción de temperatura conlleva ventajas, comparadas con la construcción de MAC, que incluyen ahorros de energía, menores emisiones y condiciones de trabajo más seguras. Sin embargo, las MAT son tecnología relativamente nueva y aún están en evaluación diferentes aspectos. Este artículo evalúa algunos de estos aspectos incluyendo compactabilidad y su relación con el diseño de mezcla y desempeño de MAT en laboratorio (i.e., deformación permanente y resistencia a la fisuración), fabricadas con tres modificadores tipo MAT, específicamente Advera®, Sasobit® y Evotherm®. Los resultados correspondientes mostraron que la compactabilidad en laboratorio para las MAT es equivalente o mejor que la obtenida para la MAC empleada como referencia (o mezcla de control), conllevando a menores contenidos óptimos de asfalto seleccionados con base en una densidad de diseño específica (i.e., 96%). En términos de desempeño, la inclusión de los aditivos tipo MAT generó la reducción de la resistencia de la mezcla ante deformación permanente, aunque su resistencia al agrietamiento podría permanecer igual o incluso mejorar en comparación con aquella de la MAC.

LEER
Influencia de la relación masa/área en las propiedades de cerámicas de PZN-5PT-5BT
...
Villaquiran, C. F. (Claudia Fernanda) | 2013-10-28

0,90Pb(Zn1/3Nb2/3)O3–0,05PbTiO3-0,05BaTiO3 (PZN-5PT-5BT) ceramic powders, with majority perovskite phase, were synthesized using the columbite method. These powders were shaped into cylindrical pellets, which had two different mass/area ratios. The pellets were sintered within 1040 and 1150°C during one hour and under a rich lead oxide atmosphere. The percentage of perovskite phase, for both powders and ceramics (surface and interior), was obtained by X-rays diffraction spectrum, where it was observed that ceramic samples present higher percentage of perovskite phase and the highest density value when sintered at 1100 ºC during one hour. Morphology was analyzed using scanning electron microscopy. It revealed that the mass/area ratio influences the stabilization of the perovskite phase within the sintering process, the bigger the content of mass for area unit the more stable the perovskita phase

LEER
Control de fasciola hepatica en el agua de consumo animal a través de filtración rápida y lenta
...
González-Morales, C. (Carolina) | 2013-10-28

The bovine fasciolosis is a zoonosis caused by Fasciola hepatica transmitted by consuming water and / or vegetables contaminated with the digenea. This disease causes significant economic losses in the dairy producer regions of Antioquia. In order to remove the eggs of the parasite from water, we designed and built two filters (rapid and slow filtration), using industrial sand as filter bed (effective size 0.45-0.55 mm). A rapid filtration system was evaluated at speeds of 5 and 8 m/h for a sand bed height of 60 cm and a slow filtration system at a speed of 1.46 m/h for sand bed heights of 30 and 40 cm. The variation of effluent flow and removal efficiency of both turbidity and parasite eggs were determined during the run of each filtration. The results show that all filters operating under the described features are 100% efficient in removing the F. hepatica eggs from the water. The turbidity removal percentages were 85.5% and 79.4% for filters operating at speeds of 5 m/h and 8 m/h respectively.

LEER
Influencia de los recubrimientos dúplex sobre las propiedades mecánicas y resistencia al desgaste del acero AISI 4140 bonificado
...
Bolívar-Osorio, F. J. (Francisco Javier) | 2013-10-28

The AISI 4140 steel is a low chrome/molybdenum alloyed steel with high tensile strength and good toughness, which is normally used for the manufacture of machine parts such as gears, crank shafts, camshafts, etc. However, its wear resistance is quite limited and this is usually improved by nitriding surface treatment. The purpose of this study was to increase the mechanical properties and wear resistance of 4140 steel by applying a DUPLEX surface treatment consisting of a liquid nitriding (known as Teniffer) followed by the deposition of a titanium nitride (TiN) hard coating. The crystalline microstructure was evaluated by Xray diffraction (XRD), morphology and elemental chemical composition was determined by microscopy SEM and energy dispersive X-ray spectroscopy (EDS), tribological properties were tested using a tribometer type ballondisc and micro hardness was determined by the Vickers method.

LEER
Metodología basada en los algoritmos Vega y Moga para solucionar un problema multiobjetivo en un sistema de producción job shop
...
Coca-Ortegón, G. A. (Germán Augusto) | 2013-10-29

This paper presents a methodology that aims to minimize simultaneously, in a “Jo b Shop” production system the following variables: process time (makespan time), cost of direct labor and also the fraction defective generated by operator fatigue. For this purpose, are taken and fused elements of genetic algorithms Vega and Moga, through the following steps: generating the initial population, form the new population, obtaining the appropriate analysis of variance and finally compared with a hybrid method of weighted sums and genetic algorithms. According to the above, when evaluating the solution faster processing time corresponding to the method based on algorithms Vega and Moga, respect to the solution faster processing time calculated from the method based on weighted sums and genetic algorithms, states that the first one exceeds the second performance as: for process time variable (in hours) at 27.86%, for variable in process time (in weeks) at 1.25%, in terms of the variable cost of direct labor in 6.73% and, as to the variable defective fraction in 25.85%.

LEER
Modelo de laboratorio de prospectiva en gerencia para la Escuela de Ingeniería de Antioquia —EIA—
...
Botero-Tobón, R. D. (Rubén Darío) | 2013-10-29

This paper presents a proposal of a model for the creation of a center of foresight in management at EIA. This proposition is based on the identification of the needs of organizations to understand the future, as a result of globalization and the changing environment. Initially a short analysis is made of the theoretical framework of the prospective as well as a summary of the results of interviews with managers of some institutions about the need to forecast the future as key to sustainable business success. Finally, a model is proposed for the creation of the Centre of foresight to be implemented at EIA as a center of studies of the future of management in terms of the development of the society, and more specifically of the enterprises in order to achieve greater accuracy of the facts to envision the possible future scenarios and to reduce the uncertainty level to make better decisions in the present. The proposed model includes the strategic and operational frameworks.

LEER
Resistencia al desgaste erosivo-corrosivo de aceros austeníticos fermanal
...
Aperador, W. (William) | 2013-11-05

We obtained austenitic alloys of the Fe-Mn-Al, Fe in the range (4.9~11.0 wt% Al) - (17.49~34.3 wt% Mn) -(0, 43 ~ 1.25 wt% C), which were melted in an induction furnace from high purity materials. The alloys were evaluated with respect to corrosion, wet erosion and corrosion-erosion at an impact angle of 90°. For the evaluation of corrosion a solution composed of 0.5 M NaCl and silica particles with size between 210 to 300 microns was used in order to analyze the effect of aluminum and manganese content in the resistance to erosion and corrosion-erosion of these alloys. To characterize the corrosion, response technique was used by potentiodynamic polarization curves and using the same technique as Tafel extrapolation, the microstructural characterization by scanning electron microscopy (SEM), and the composition of corrosion products were analyzed using diffraction of X-rays (XRD).

LEER
Efecto del contenido de carbono sobre la resistencia al desgaste abrasivo de recubrimientos de CrC depositados por pulverización catódica magnetrón
...
Gómez-Botero, M. A. (Maryory Astrid) | 2013-11-05

Chromium carbide coatings on steel are a good candidate for applications on forming and molding dies. The high mechanical strength, chemical resistance and high temperature stability of Cr3C2 phase can be compatible with the severe abrasive wear and corrosion found in those manufacture operations. In this work chromium carbide coatings deposited by means of RF magnetron sputtering showed carbon contents between 25 % and 58 % by EDS analysis. Hardness values of these coatings were between 15 and 24 GPa, being the hardest values in the samples with carbon content in the 39-53 % range. The abrasive wear behavior of the coatings was evaluated by using a dimple grinder with diamond powder. The volume of the abrasion craters was measured from the images obtained with the interferometric microscope, and further corroborated by geometrical volume calculation based in profilometer sections that were measured. Abrasive wear behavior showed a marked dependence with carbon content. The lowest abrasive wear was obtained for the coatings with the highest carbon content.

LEER

‹›

Biblioteca Universidad Escuela Ingenieros de Antioquia

Sede de Las Palmas: Km 2 + 200 Vía al Aeropuerto José María Córdova Envigado, Colombia. Código Postal: 055428
Tel:(+57) 4 354 40 00, ext. 248
biblioteca_ueia@eia.edu.co

Sistema Dspace - Metabiblioteca |

Listar B. Revistas Cientificas EIA por fecha de publicación

Indicadores de alerta temprana de vulnerabilidad macroeconómica ﻿

Desarrollo de un sistema de audición vibrotáctil para el acceso a la música: Fase I ﻿

Lecciones del concurso de puentes EIA ﻿

Tecnologías de tratamiento para la tierra Fuller contaminada con aceite dieléctrico ﻿

Implementación de un sistema de medición de temperatura empleando fibra óptica para el estudio térmico de transformadores de distribución inmersos en aceite mineral y vegetal ﻿

Remoción de níquel y DQO presentes en las aguas residuales de la industria automotriz mediante electrocoagulación ﻿

Why animals come together, with the special case of mixed-species bird flocks ﻿

Determinación del color del exocarpio como indicador de desarrollo fisiológico y madurez en la guayaba pera (psidium guajava cv. guayaba pera), utilizando técnicas de procesamiento digital de imágenes ﻿

Desarrollo e implementación de un modelo de teoría de restricciones para sincronizar las operaciones en la cadena de suministro ﻿

Impacto del material reciclado en los inventarios de materias primas de una empresa manufacturera ﻿

Evaluación ambiental para procesos que usan residuos de la industria de los biocombustibles como materias primas ﻿

Síntesis y caracterización de óxidos mixtos de sílice-titania preparados por método sol-gel y tratamiento hidrotérmico ﻿

Laboratory evaluation of compactability and performance of warm mix asphalt ﻿

Influencia de la relación masa/área en las propiedades de cerámicas de PZN-5PT-5BT ﻿

Control de fasciola hepatica en el agua de consumo animal a través de filtración rápida y lenta ﻿

Influencia de los recubrimientos dúplex sobre las propiedades mecánicas y resistencia al desgaste del acero AISI 4140 bonificado ﻿

Metodología basada en los algoritmos Vega y Moga para solucionar un problema multiobjetivo en un sistema de producción job shop ﻿

Modelo de laboratorio de prospectiva en gerencia para la Escuela de Ingeniería de Antioquia —EIA— ﻿

Resistencia al desgaste erosivo-corrosivo de aceros austeníticos fermanal ﻿

Efecto del contenido de carbono sobre la resistencia al desgaste abrasivo de recubrimientos de CrC depositados por pulverización catódica magnetrón ﻿

Envíos recientes

Indicadores de alerta temprana de vulnerabilidad macroeconómica

Desarrollo de un sistema de audición vibrotáctil para el acceso a la música: Fase I

Lecciones del concurso de puentes EIA

Tecnologías de tratamiento para la tierra Fuller contaminada con aceite dieléctrico

Implementación de un sistema de medición de temperatura empleando fibra óptica para el estudio térmico de transformadores de distribución inmersos en aceite mineral y vegetal

Remoción de níquel y DQO presentes en las aguas residuales de la industria automotriz mediante electrocoagulación

Why animals come together, with the special case of mixed-species bird flocks

Determinación del color del exocarpio como indicador de desarrollo fisiológico y madurez en la guayaba pera (psidium guajava cv. guayaba pera), utilizando técnicas de procesamiento digital de imágenes

Desarrollo e implementación de un modelo de teoría de restricciones para sincronizar las operaciones en la cadena de suministro

Impacto del material reciclado en los inventarios de materias primas de una empresa manufacturera

Evaluación ambiental para procesos que usan residuos de la industria de los biocombustibles como materias primas

Síntesis y caracterización de óxidos mixtos de sílice-titania preparados por método sol-gel y tratamiento hidrotérmico

Laboratory evaluation of compactability and performance of warm mix asphalt

Influencia de la relación masa/área en las propiedades de cerámicas de PZN-5PT-5BT

Control de fasciola hepatica en el agua de consumo animal a través de filtración rápida y lenta

Influencia de los recubrimientos dúplex sobre las propiedades mecánicas y resistencia al desgaste del acero AISI 4140 bonificado

Metodología basada en los algoritmos Vega y Moga para solucionar un problema multiobjetivo en un sistema de producción job shop

Modelo de laboratorio de prospectiva en gerencia para la Escuela de Ingeniería de Antioquia —EIA—

Resistencia al desgaste erosivo-corrosivo de aceros austeníticos fermanal

Efecto del contenido de carbono sobre la resistencia al desgaste abrasivo de recubrimientos de CrC depositados por pulverización catódica magnetrón

Biblioteca Universidad Escuela Ingenieros de Antioquia

Indicadores de alerta temprana de vulnerabilidad macroeconómica

Desarrollo de un sistema de audición vibrotáctil para el acceso a la música: Fase I

Lecciones del concurso de puentes EIA

Tecnologías de tratamiento para la tierra Fuller contaminada con aceite dieléctrico

Implementación de un sistema de medición de temperatura empleando fibra óptica para el estudio térmico de transformadores de distribución inmersos en aceite mineral y vegetal

Remoción de níquel y DQO presentes en las aguas residuales de la industria automotriz mediante electrocoagulación

Why animals come together, with the special case of mixed-species bird flocks

Determinación del color del exocarpio como indicador de desarrollo fisiológico y madurez en la guayaba pera (psidium guajava cv. guayaba pera), utilizando técnicas de procesamiento digital de imágenes

Desarrollo e implementación de un modelo de teoría de restricciones para sincronizar las operaciones en la cadena de suministro

Impacto del material reciclado en los inventarios de materias primas de una empresa manufacturera

Evaluación ambiental para procesos que usan residuos de la industria de los biocombustibles como materias primas

Síntesis y caracterización de óxidos mixtos de sílice-titania preparados por método sol-gel y tratamiento hidrotérmico

Laboratory evaluation of compactability and performance of warm mix asphalt

Influencia de la relación masa/área en las propiedades de cerámicas de PZN-5PT-5BT

Control de fasciola hepatica en el agua de consumo animal a través de filtración rápida y lenta

Influencia de los recubrimientos dúplex sobre las propiedades mecánicas y resistencia al desgaste del acero AISI 4140 bonificado

Metodología basada en los algoritmos Vega y Moga para solucionar un problema multiobjetivo en un sistema de producción job shop

Modelo de laboratorio de prospectiva en gerencia para la Escuela de Ingeniería de Antioquia —EIA—

Resistencia al desgaste erosivo-corrosivo de aceros austeníticos fermanal

Efecto del contenido de carbono sobre la resistencia al desgaste abrasivo de recubrimientos de CrC depositados por pulverización catódica magnetrón