Now showing items 65-84 of 212

La ecuación en diferencias finitas de Riccati en el cálculo de baterías de extractores

Poveda-Ramos, G. (Gabriel) (Escuela de Ingeniería de Antioquia EIA, 2014-05-08)

This document exposes: 1) A brief reminder of the process for the extraction of phosphoric acid from phosphoric rock by extraction with dilute sulfuric acid in a battery of Dorr thickeners in countercurrent; 2) a mass ...
Efecto de la densidad de corriente sobre la morfología y las propiedades electroquímicas en películas anódicas porosas, crecidas sobre AA 2024-T3

Aperador, W. (William); Vera, Enrique E.; Ipaz, Leoníd Milfred (Fondo Editorial EIA, 2013-11-18)

This paper reports the results of a study about the corrosion electrochemical properties of the porous anodic films grown on aluminium alloys 2024 T3, obtained by DC technique at current densities of 10, 15 and 20 mA/cm2 ...
Efecto de la temperatura sobre la resistencia a la tracción de algunos refuerzos de fibras para matrices cerámicas o poliméricas

Gómez-Botero, M. A. (Maryory Astrid); Alzate, C. C. (Claudia Cecilia); Márquez, A. (Alexánder); Restrepo, José William; Jaramillo-Isaza, F. (Franklin) (Fondo Editorial EIA, 2013-11-27)

This paper presents a study of the thermomechanical properties of low carbon steel, AISI-SAE 304 stainless steel, aramid and carbon fibers. Moreover, surface aspect of mineral rock wool of and aluminosilicate wool ...
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 ...
Efecto del incremento en la turbiedad del agua cruda sobre la eficiencia de procesos convencionales de potabilización

Montoya, C. (Carolina); Loaiza, D. (Diana); Torres, P. (Patricia); Cruz, Camilo H. (Camilo Hernán); Escobar, Juan Carlos (Fondo Editorial EIA, 2013-11-15)

Environmental phenomena cause a strong impact in the variation of the quality of sources for drinking water, demanding that potable water treatment processes respond to these changes and maintain quality standards in the ...
Efecto del ozono en la remoción de materia orgánica disuelta de un efluente secundario

Muñoz, J. F. (Juan Fernando); Orta, M. T. (Maria Teresa) (Fondo Editorial EIA, 2013-11-07)

This paper presents the results of treatment with ozone and subsequent fractionation of dissolved organic matter (DOM) from secondary effluent from Cerro de la Estrella wastewater treatment plant located in Mexico City. ...
Efectos del mercurio sobre algunas plantas acuáticas tropicales

Posada-Posada, M. I. (Martha Isabel); Arroyave-Maya, M. P. (Maria del Pilar) (Civil, Ambiental Geológica e IndustrialEscuela de Ingeniería de Antioquia EIA, 2014-05-08)

This paper describes the effects of mercury on some aquatic plants of the tropics and their habitats. Additionally, a protocol for toxicity tests in duckweed (Lemna minor) is recommended, and the results of preliminary ...
Electronic system for experimentation in AC electrogravimetry I: technique fundamentals

Torres-Villa, R. A. (Róbinson Alberto); Arnau, A. (Antonio); Perrot, H. (Hubert ) (Civil, Ambiental Geológica e IndustrialEscuela de Ingeniería de Antioquia EIA, 2014-05-07)

Basic fundamentals of AC electrogravimetry are introduced. Their main requirements and characteristics are detailed to establish the design of an electronic system that allows the appropriate extraction of data needed ...
Electronic system for experimentation in ac electrogravimetry II: implemented design

Torres-Villa, R. A. (Róbinson Alberto); Arnau, A. (Antonio); Perrot, H. (Hubert ); Aedo-Cobo, J. E. (José Edinson) (Escuela de Ingeniería de Antioquia EIA, 2014-05-08)

En este artículo se presenta una descripción detallada del sistema electrónico diseñado para mejorar las medidas en un sistema experimental de electrogravimetría AC. El sistema diseñado se encarga de adquirir los datos ...
La empresa moderna en el marco de la corriente institucionalista.

Pantoja-Robayo, J. O. (Javier Orlando); Arévalo-Silva, E. (Erika) (Administrativa, Financiera, Sistemas y ComputaciónEscuela de Ingeniería de Antioquia EIA, 2014-05-07)

The inclusion by the current “New Institutional Economics” of the company privileges the economic analysis beginning with the man and the organization, instead of the market, therefore constructing an organizational theory ...
Energía de enlace de excitones en pozos cuánticos de Gaas/Ga1-xa1xas

Aristizábal, P. (Parménides); Restrepo-Arango, R. L. (Ricardo León); Ospina-Muñoz, W. A. (Walter Antonio); Duque-Echeverri, C. A. (Carlos Alberto) (Escuela de Ingeniería de Antioquia EIA, 2014-05-08)

The use of low dimensional structures is a key technological element in the creation of new quantum functional devices in the development of the next generation of the electronic, photonic, and spintronic integrated ...
Engineering materials surfaces by microfabrication techniques, to regulate in vitro cell functions: review

Gallego, D. (Diego); Hansford, D. (Derek) (Biomédica, Mecatrónica y MecánicaEscuela de Ingeniería de Antioquia EIA, 2014-05-07)

Ha quedado claro que las propiedades superficiales de los materiales utilizados como sustratos para cultivo celular pueden influir en el comportamiento de las células afectando diferentes factores tales como la orientación ...
Enseñanza de las ciencias desde una mirada de la didáctica de la Escuela Francesa

Barros-Martínez, J. F. (Juan Fernando) (Escuela de Ingeniería de Antioquia EIA, 2014-05-12)

In science teaching variety of knowledge takes part: that of sciences, that of the scientist, the academic, that of the professor, the daily one, that of the student. In this paper a journey for some models of ...
Estimación de las emisiones de contaminantes atmosféricos provenientes de fuentes móviles en el área urbana de Envigado, Colombia

Londoño, J. (James); Correa, M. A. (Mauricio Andrés); Palacio, C. A. (Carlos Alberto) (Fondo Editorial EIA, 2013-11-15)

This research presents the results of estimates of air pollutants (CO, NOx, SO2, PM10 and VOC) from mobile sources in the urban area of the municipality of Envigado for 2010. We use information on vehicles registered in ...
Estrategia de reducción para la aplicación generalizada de localizadores de fallas en sistemas de distribución de energía eléctrica

Bedoya-Cadena, Andrés; Mora-Flórez, Juan José; Pérez-Londoño, Sandra Milena (Fondo Editorial EIA, 2013-11-08)

This paper presents a generalized strategy applied to perform the reduction of power distribution systems composed by several tapped feeders into equivalent radial feeders, as basic procedure required to the generalized ...
Estudio comparativo de dureza en dientes artificiales fabricados con diferentes tipos de resinas acrílicas

Kurzer, M. ( Melissa) (Biomédica, Mecatrónica y MecánicaEscuela de Ingeniería de Antioquia EIA, 2014-05-08)

There are available artificial teeth made of three types of acrylic resin: conventional, IPN (interpenetrating polymer network) and composite. When the properties of these acrylic teeth are compared with the natural ones, ...
Estudio comparativo de la remoción de materia orgánica en humedales construidos de flujo horizontal subsuperficial usando tres especies de macrófitas

Montoya, J. I. (Jorge Ignacio); Ceballos, L. (Leonardo); Casas, J. C. (Juan Carlos); Morató, J. (Jordi) (Fondo Editorial EIA, 2013-11-21)

Constructed wetlands appear at the present time like a promising technology in reducing the pollution by waste waters; this study investigated the organic matter removal with synthetic waste water, in terms of chemical ...
Estudio de características cristalográficas, morfológicas, composicionales y eléctricas de varistores comerciales

Giraldo-Tobón, E. (Eugenio); Miranda-Pedraza, G. L. (Guillermo León); Abad-Mejia, P. J. (Pablo De Jesus) (Biomédica, Mecatrónica y MecánicaEscuela de Ingeniería de Antioquia EIA, 2014-05-08)

A comparative market existing products study is presented to define criteria with regard of which samples obtained by varistor research can be compared or to define quality control standards for consumers. Crystallographic ...
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 ...
Evaluación de la resistencia de un aislado bacteriano nativo compatible con Pseudomona sp. al insecticida Lorsban 4 EC

Quinchía-Figueroa, A. M. (Adriana María); Gomez-Velasquez, F. A. (Felipe Andres); Palencia-Penagos, K. (Karol); Giraldo-Lopera, C. E. (Clara Eugenia) (Biomédica, Mecatrónica y MecánicaEscuela de Ingeniería de Antioquia EIA, 2014-05-07)

The resistance of an isolated bacterial culture compatible with Pseudomona sp. to the insecticide Lorsban 4 EC (active ingredient Chlorpyrifos) was evaluated at laboratory scale. The bacterial culture was isolated from ...

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La ecuación en diferencias finitas de Riccati en el cálculo de baterías de extractores
...
Poveda-Ramos, G. (Gabriel) | 2014-05-08

This document exposes: 1) A brief reminder of the process for the extraction of phosphoric acid from phosphoric rock by extraction with dilute sulfuric acid in a battery of Dorr thickeners in countercurrent; 2) a mass balance for P2O5 leads to a Riccati finite differences equation which governs the enrichment in acid concentration (Cn) in the tank number n; 3) the solution of the equation with technical initial conditions and economic restrictions gives the explicit function Cn = F (n); 4) the inverse function F–1 (Cn) = n gives the necessary, sufficient, and most economic number of tanks. No need of graphic, approximate methods neither of trial-and-error, as Unit Operations textbooks teach usually.

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Efecto de la densidad de corriente sobre la morfología y las propiedades electroquímicas en películas anódicas porosas, crecidas sobre AA 2024-T3
...
Aperador, W. (William) | 2013-11-18

This paper reports the results of a study about the corrosion electrochemical properties of the porous anodic films grown on aluminium alloys 2024 T3, obtained by DC technique at current densities of 10, 15 and 20 mA/cm2 in an aqueous solution of H2SO4. Materials characterization was carried out using atomic force microscopy (AFM) allowing identify that the increase in the current density produces a greater surface homogeneity and a decrease of average surface roughness. The micro-hardness Vickers measurements determined that the hard anodization layer improves their mechanical resistance related to the substrate. To evaluate the corrosion resistance of the anodic films, the EIS technique and Tafel polarization curves were employed. From these techniques it has been determined that the increase in the current density values forms films that increase the corrosion resistance. In addition the electrochemical behavior of the obtained films was modeled and the correlation with the images obtained by scattering electron microscopy (SEM) was made.

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Efecto de la temperatura sobre la resistencia a la tracción de algunos refuerzos de fibras para matrices cerámicas o poliméricas
...
Gómez-Botero, M. A. (Maryory Astrid) | 2013-11-27

This paper presents a study of the thermomechanical properties of low carbon steel, AISI-SAE 304 stainless steel, aramid and carbon fibers. Moreover, surface aspect of mineral rock wool of and aluminosilicate wool reinforcements was analyzed prior and after submitting to heat treatments at 1000 ºC. The tensile resistance of the fibers was evaluated prior and after submitting to heat treatments at temperatures of 400, 600, 800 and 1000ºC depending on the degradation that they showed. Moreover, a thermogravimetric analysis was carried out on each kind of fiber to determine the changes in weight at different temperatures. The stainless steel fibers showed the highest mechanical stability, whereas the aramid fibers with treatments at 400ºC showed practically null mechanical properties.

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

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Efecto del incremento en la turbiedad del agua cruda sobre la eficiencia de procesos convencionales de potabilización
...
Montoya, C. (Carolina) | 2013-11-15

Environmental phenomena cause a strong impact in the variation of the quality of sources for drinking water, demanding that potable water treatment processes respond to these changes and maintain quality standards in the production of safe drinking water. The historical analysis of river Cauca turbidity and behavior of clarified and filtrated water allowed evaluating the effect of increase in raw water turbidity over water treatment conventional processes of Puerto Mallarino plant at Cali (Colombia). It was determined that the high turbidity of the water of river affected the treatment efficiency and also the quality of treated water; filtration was the most vulnerable stage to these high turbidity events. A high linear correlation between maximum turbidity and chemical products dose (coagulant and disinfectant) was identified.

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Efecto del ozono en la remoción de materia orgánica disuelta de un efluente secundario
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Muñoz, J. F. (Juan Fernando) | 2013-11-07

This paper presents the results of treatment with ozone and subsequent fractionation of dissolved organic matter (DOM) from secondary effluent from Cerro de la Estrella wastewater treatment plant located in Mexico City. The ozonation was carried out with two concentrations of ozone in the gas phase (5 and 25 mg/L) and two contact times (10 and 20 min). Fractionation of DOM was made using the resins XAD-4 and XAD-8, in order to determine the amount of hydrophobic and hydrophilic organic matter present in the wastewater. The best results were achieved with a concentration of 25 mg/L and a contact time of 20 minutes, achieving removals of 85 % color, 63 % turbidity, 71 % chemical oxygen demand (COD) and 78 % of UV254. We also determined the composition of DOM of secondary effluent in terms of total organic carbon (TOC), finding that ozone causes the hydrophobic organic matter from the effluent studied to decrease from 46 % to 32 % and the hydrophilic organic matter to increase from 32 % to 42 %.

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Efectos del mercurio sobre algunas plantas acuáticas tropicales
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Posada-Posada, M. I. (Martha Isabel) | 2014-05-08

This paper describes the effects of mercury on some aquatic plants of the tropics and their habitats. Additionally, a protocol for toxicity tests in duckweed (Lemna minor) is recommended, and the results of preliminary tests with salts of mercury under laboratory conditions are given. It was found that mercury is in different toxicity and bioavailability forms depending on the factors that facilitate the solubilization of this element in the water. Many plants act as bioindicators because they withhold the metal selectively, while others are bioaccumulators since they tolerate and accumulate them in their structures producing biomagnification through the food web. The preliminary tests carried out in Lemna minor suggest that the appropriate concentrations for the toxicity tests are between 0,01 mg/L and 10,0 mg/L for Hg.

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Electronic system for experimentation in AC electrogravimetry I: technique fundamentals
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Torres-Villa, R. A. (Róbinson Alberto) | 2014-05-07

Basic fundamentals of AC electrogravimetry are introduced. Their main requirements and characteristics are detailed to establish the design of an electronic system that allows the appropriate extraction of data needed to determine the electrogravimetric transfer function (EGTF) and electrochemical impedance (EI), in an experimental set-up for the AC electrogravimetry technique.

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Electronic system for experimentation in ac electrogravimetry II: implemented design
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Torres-Villa, R. A. (Róbinson Alberto) | 2014-05-08

En este artículo se presenta una descripción detallada del sistema electrónico diseñado para mejorar las medidas en un sistema experimental de electrogravimetría AC. El sistema diseñado se encarga de adquirir los datos adecuados para determinar la función de transferencia electrogravimétrica (EGTF) y proveer información relacionada con la transferencia de masa en una celda electroquímica en la técnica de electrogravimetría AC, pero manteniendo un buen compromiso entre el ancho de banda de enganche y la resolución en el seguimiento de la frecuencia, es decir, el sistema incrementa el ancho de banda para permitir el seguimiento de señales con frecuencias hasta de 1 kHz, pero conservando un exacto y continuo seguimiento de esta señal. El aumento del ancho de banda permite el estudio de procesos con una cinética rápida en aplicaciones electroquímicas y el seguimiento continuo de la señal permite la obtención de medidas precisas con buena resolución en contraste con los datos de frecuencia promediados entregados por los frecuencímetros convencionales. El sistema se basa en un bucle de enganche de fase analógico-digital (A-D PLL).

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La empresa moderna en el marco de la corriente institucionalista.
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Pantoja-Robayo, J. O. (Javier Orlando) | 2014-05-07

The inclusion by the current “New Institutional Economics” of the company privileges the economic analysis beginning with the man and the organization, instead of the market, therefore constructing an organizational theory where the figure of the business manager and the decision making are key aspects in the economy development. In this paper, the emerge of modern company and the importance of institutions for economic performance is presented, in a way that allows the existence of a transactional structure within economies, obeying to given dynamics of learning processes in human beings, and its consequent change toward systems evolution included in a temporal structure.

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Energía de enlace de excitones en pozos cuánticos de Gaas/Ga1-xa1xas
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Aristizábal, P. (Parménides) | 2014-05-08

The use of low dimensional structures is a key technological element in the creation of new quantum functional devices in the development of the next generation of the electronic, photonic, and spintronic integrated circuits and many other nanoscaled devices that are necessary for the information society of 21st century. One of the most important optical properties is the photoluminescence produced by agents as impurities and excitons in GaAs quantum wells, wires, and dots with nanometric dimensions under the influence of electric and magnetic fields and external pressures. The binding energy for the first three excitonic states in GaAs/Ga1-xA1xAs quantum wells describing the system through quantum theory in the effective mass approximation and using the variational method is presented.

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Engineering materials surfaces by microfabrication techniques, to regulate in vitro cell functions: review
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Gallego, D. (Diego) | 2014-05-07

Ha quedado claro que las propiedades superficiales de los materiales utilizados como sustratos para cultivo celular pueden influir en el comportamiento de las células afectando diferentes factores tales como la orientación celular, adhesión, crecimiento, diferenciación y apoptosis. En los últimos años, varias técnicas de microfabricación y nanofabricación han emergido como herramientas importantes usadas para modificar las propiedades superficiales de esos materiales en la escala micrométrica y nanométrica, ya sea topográfica o químicamente. Este artículo revisa las técnicas de microfabricación mas usadas para introducir modificaciones en las superficies de los materiales y sus implicaciones en el comportamiento celular. Esta revisión termina mostrando las posibles aplicaciones médicas derivadas como una fuente de futuros desarrollos en este campo.

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Enseñanza de las ciencias desde una mirada de la didáctica de la Escuela Francesa
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Barros-Martínez, J. F. (Juan Fernando) | 2014-05-12

In science teaching variety of knowledge takes part: that of sciences, that of the scientist, the academic, that of the professor, the daily one, that of the student. In this paper a journey for some models of constructivist’s focus is carried out, until arriving to the didactics of the French school, in an attempt to show the elements of the didactic situations of important development in mathematics teaching. The intention is to show that this didactics could be welcomed in the teaching of sciences, since its proposal offers to the process of teaching-learning and in particular to the ternary relationship professor, student and object of the knowledge elements for a didactic development that can guarantee the appropriation of the knowledge on the part of the student.

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Estimación de las emisiones de contaminantes atmosféricos provenientes de fuentes móviles en el área urbana de Envigado, Colombia
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Londoño, J. (James) | 2013-11-15

This research presents the results of estimates of air pollutants (CO, NOx, SO2, PM10 and VOC) from mobile sources in the urban area of the municipality of Envigado for 2010. We use information on vehicles registered in the municipality, capacity, vehicular distribution and activity for categories. The emissions were estimated by the factors in the IVE method with best fit to the mobility patterns, vehicular fleet characteristics and type of combustibles in the area under study. As a result, it was possible to estimate hourly and daily emissions of the pollutants studied, and with the help of a GIS system, were plotted. From the results, we found that the largest releases occurred on roads with higher vehicle traffic (Carrera 50 or Avenue Regional, Carrera 48 or Avenue Las Vegas, Carrera 43A or Avenue El Poblado and road parallel to the stream La Ayurá), where the largest contribution does carbon monoxide (CO) with 18,4 t d-1 (71,3 %), time of day which showed the highest emission of this pollutant is at 12:00 hours with 1,4 t h-1 (7,4 %) and the vehicle category that most contributes to environmental levels are Automobile with 8 t d-1 (32,7 %).

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Estrategia de reducción para la aplicación generalizada de localizadores de fallas en sistemas de distribución de energía eléctrica
...
Bedoya-Cadena, Andrés | 2013-11-08

This paper presents a generalized strategy applied to perform the reduction of power distribution systems composed by several tapped feeders into equivalent radial feeders, as basic procedure required to the generalized implementation of impedance based fault location methods. The proposed strategy is tested using a fault location method, where it is shown a straightforward procedure to analyze the locations, and additionally the results shows errors lower than 3.5 % in the distance estimation for single line to ground, phase to phase, three phase faults. These results confirm the validity of the proposal.

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Estudio comparativo de dureza en dientes artificiales fabricados con diferentes tipos de resinas acrílicas
...
Kurzer, M. ( Melissa) | 2014-05-08

There are available artificial teeth made of three types of acrylic resin: conventional, IPN (interpenetrating polymer network) and composite. When the properties of these acrylic teeth are compared with the natural ones, a significant difference in the properties is observed, for instance, their hardness. In this project the superficial Knoop hardness of acrylic teeth made of different type of PMMA acrylic resin was compared. The purpose was to determine whether exists a significant difference between them and whether the type of acrylic resin used could be an alternative for improving the hardness of these implants. As a result, it was found that the teeth made of microfilled composite acrylic have more hardness than the ones made of conventional or IPN acrylic resin. Despite of this, they still have a very small hardness value when compared with the natural teeth (enamel 270-350 KHN and dentin 50-70 KHN).

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Estudio comparativo de la remoción de materia orgánica en humedales construidos de flujo horizontal subsuperficial usando tres especies de macrófitas
...
Montoya, J. I. (Jorge Ignacio) | 2013-11-21

Constructed wetlands appear at the present time like a promising technology in reducing the pollution by waste waters; this study investigated the organic matter removal with synthetic waste water, in terms of chemical oxygen demand (COD), biological oxygen demand (BOD5) and in situ measurements of pH, oxygen and temperatura every 15 days, during three months, in six horizontal subsurface-flow constructed wetland systems, in pilot scale, seeded with three different macrophytes: Canna limbata, Heliconia psittacorum and Phragmites sp; the average removals of COD were of 97,31 % and 95,94 % for Canna limbata; 94,49 % and 93,50 % for Heliconia psittacorum; 97,39 % and 97,13 % for Phragmites sp. In BOD they were of 100 % and 99,36 % for Canna limbata; 99,09 % and 97,49 % for Heliconia psittacorum; 100 % and 99,45 % for Phragmites sp. We conclude that there are significant differences in DQO removal between different plants (P < 0,05); in BOD5 removal significant differences between the different plants do not exist statistically (P < 0,05). This study demonstrates the option to reduce the polution from organic matter using constructed wetlands.

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Estudio de características cristalográficas, morfológicas, composicionales y eléctricas de varistores comerciales
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Giraldo-Tobón, E. (Eugenio) | 2014-05-08

A comparative market existing products study is presented to define criteria with regard of which samples obtained by varistor research can be compared or to define quality control standards for consumers. Crystallographic and morphologic characteristics of varistors with different break voltages were studied, presumably with standard composition of zinc oxide, through DRX and SEM; the quantitative chemical and electric characterization analyses were realized to obtain the characteristic curve I-V.

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

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Evaluación de la resistencia de un aislado bacteriano nativo compatible con Pseudomona sp. al insecticida Lorsban 4 EC
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Quinchía-Figueroa, A. M. (Adriana María) | 2014-05-07

The resistance of an isolated bacterial culture compatible with Pseudomona sp. to the insecticide Lorsban 4 EC (active ingredient Chlorpyrifos) was evaluated at laboratory scale. The bacterial culture was isolated from a soil sample obtained in East Antioquia that was exposed to the application of the insecticide which is used in grass culture. The principal factors that affect the mobility and adsorption of insecticides in soil were analyzed. The results showed a high percentage of organic matter, and macro and micronutrients as well as medium to high cationic capacity of exchange, which facilitates the adsorption of the pesticide in the colloidal fraction of organic and inorganic fraction. The sandy texture of the soil generates good aeration that favors the processes of volatilization and degradation of the pesticide. Isolated bacterial culture was exposed to different concentrations of the insecticide (480, 4,800, 24,000 and 48,000 ppm), to evaluate the effect of the agent on the bacterial population. According to the results of the tests, the native isolated bacterium compatible with Pseudomona sp. is resistant to the insecticide concentrations studied and possibly has the capacity to degrade the Lorsban 4 EC.

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Browsing Revista EIA by Title

La ecuación en diferencias finitas de Riccati en el cálculo de baterías de extractores ﻿

Efecto de la densidad de corriente sobre la morfología y las propiedades electroquímicas en películas anódicas porosas, crecidas sobre AA 2024-T3 ﻿

Efecto de la temperatura sobre la resistencia a la tracción de algunos refuerzos de fibras para matrices cerámicas o poliméricas ﻿

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

Efecto del incremento en la turbiedad del agua cruda sobre la eficiencia de procesos convencionales de potabilización ﻿

Efecto del ozono en la remoción de materia orgánica disuelta de un efluente secundario ﻿

Efectos del mercurio sobre algunas plantas acuáticas tropicales ﻿

Electronic system for experimentation in AC electrogravimetry I: technique fundamentals ﻿

Electronic system for experimentation in ac electrogravimetry II: implemented design ﻿

La empresa moderna en el marco de la corriente institucionalista. ﻿

Energía de enlace de excitones en pozos cuánticos de Gaas/Ga1-xa1xas ﻿

Engineering materials surfaces by microfabrication techniques, to regulate in vitro cell functions: review ﻿

Enseñanza de las ciencias desde una mirada de la didáctica de la Escuela Francesa ﻿

Estimación de las emisiones de contaminantes atmosféricos provenientes de fuentes móviles en el área urbana de Envigado, Colombia ﻿

Estrategia de reducción para la aplicación generalizada de localizadores de fallas en sistemas de distribución de energía eléctrica ﻿

Estudio comparativo de dureza en dientes artificiales fabricados con diferentes tipos de resinas acrílicas ﻿

Estudio comparativo de la remoción de materia orgánica en humedales construidos de flujo horizontal subsuperficial usando tres especies de macrófitas ﻿

Estudio de características cristalográficas, morfológicas, composicionales y eléctricas de varistores comerciales ﻿

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

Evaluación de la resistencia de un aislado bacteriano nativo compatible con Pseudomona sp. al insecticida Lorsban 4 EC ﻿

Envíos recientes

La ecuación en diferencias finitas de Riccati en el cálculo de baterías de extractores

Efecto de la densidad de corriente sobre la morfología y las propiedades electroquímicas en películas anódicas porosas, crecidas sobre AA 2024-T3

Efecto de la temperatura sobre la resistencia a la tracción de algunos refuerzos de fibras para matrices cerámicas o poliméricas

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

Efecto del incremento en la turbiedad del agua cruda sobre la eficiencia de procesos convencionales de potabilización

Efecto del ozono en la remoción de materia orgánica disuelta de un efluente secundario

Efectos del mercurio sobre algunas plantas acuáticas tropicales

Electronic system for experimentation in AC electrogravimetry I: technique fundamentals

Electronic system for experimentation in ac electrogravimetry II: implemented design

La empresa moderna en el marco de la corriente institucionalista.

Energía de enlace de excitones en pozos cuánticos de Gaas/Ga1-xa1xas

Engineering materials surfaces by microfabrication techniques, to regulate in vitro cell functions: review

Enseñanza de las ciencias desde una mirada de la didáctica de la Escuela Francesa

Estimación de las emisiones de contaminantes atmosféricos provenientes de fuentes móviles en el área urbana de Envigado, Colombia

Estrategia de reducción para la aplicación generalizada de localizadores de fallas en sistemas de distribución de energía eléctrica

Estudio comparativo de dureza en dientes artificiales fabricados con diferentes tipos de resinas acrílicas

Estudio comparativo de la remoción de materia orgánica en humedales construidos de flujo horizontal subsuperficial usando tres especies de macrófitas

Estudio de características cristalográficas, morfológicas, composicionales y eléctricas de varistores comerciales

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

Evaluación de la resistencia de un aislado bacteriano nativo compatible con Pseudomona sp. al insecticida Lorsban 4 EC

Biblioteca Universidad Escuela Ingenieros de Antioquia

La ecuación en diferencias finitas de Riccati en el cálculo de baterías de extractores

Efecto de la densidad de corriente sobre la morfología y las propiedades electroquímicas en películas anódicas porosas, crecidas sobre AA 2024-T3

Efecto de la temperatura sobre la resistencia a la tracción de algunos refuerzos de fibras para matrices cerámicas o poliméricas

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

Efecto del incremento en la turbiedad del agua cruda sobre la eficiencia de procesos convencionales de potabilización

Efecto del ozono en la remoción de materia orgánica disuelta de un efluente secundario

Efectos del mercurio sobre algunas plantas acuáticas tropicales

Electronic system for experimentation in AC electrogravimetry I: technique fundamentals

Electronic system for experimentation in ac electrogravimetry II: implemented design

La empresa moderna en el marco de la corriente institucionalista.

Energía de enlace de excitones en pozos cuánticos de Gaas/Ga1-xa1xas

Engineering materials surfaces by microfabrication techniques, to regulate in vitro cell functions: review

Enseñanza de las ciencias desde una mirada de la didáctica de la Escuela Francesa

Estimación de las emisiones de contaminantes atmosféricos provenientes de fuentes móviles en el área urbana de Envigado, Colombia

Estrategia de reducción para la aplicación generalizada de localizadores de fallas en sistemas de distribución de energía eléctrica

Estudio comparativo de dureza en dientes artificiales fabricados con diferentes tipos de resinas acrílicas

Estudio comparativo de la remoción de materia orgánica en humedales construidos de flujo horizontal subsuperficial usando tres especies de macrófitas

Estudio de características cristalográficas, morfológicas, composicionales y eléctricas de varistores comerciales

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

Evaluación de la resistencia de un aislado bacteriano nativo compatible con Pseudomona sp. al insecticida Lorsban 4 EC