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Archivo Digital UPM (74,665 recursos)
This is an institutional repository providing access to the research output of the institution. Primarily contains thesis.

Materia = Química

Mostrando recursos 1 - 20 de 1,012

1. Clasificación de zonas en instalaciones para vehículos propulsados por GNC - Lázaro Higuera, Jaime
El presente proyecto tiene como objetivo principal el análisis de la viabilidad de estacionamiento de vehículos propulsados por gas natural comprimido (GNC) desde el punto de vista de formación de atmosferas potencialmente explosivas en los garajes subterráneos. Además se ha realizado una breve introducción sobre el GNC explicando el origen, la composición y los diferentes usos que tiene. Se ha realizado la evaluación de riesgos asociados a la utilización de vehículos propulsados por gas natural y estimación de tasas de escape en el circuito de combustible de los vehículos propulsados por GNC. Para ello se ha aplicado la normativa UNE...

2. Clasificación de zonas en instalaciones para vehículos propulsados por GNC - Lázaro Higuera, Jaime
El presente proyecto tiene como objetivo principal el análisis de la viabilidad de estacionamiento de vehículos propulsados por gas natural comprimido (GNC) desde el punto de vista de formación de atmosferas potencialmente explosivas en los garajes subterráneos. Además se ha realizado una breve introducción sobre el GNC explicando el origen, la composición y los diferentes usos que tiene. Se ha realizado la evaluación de riesgos asociados a la utilización de vehículos propulsados por gas natural y estimación de tasas de escape en el circuito de combustible de los vehículos propulsados por GNC. Para ello se ha aplicado la normativa UNE...

3. Wettability, polarity and water absorption of Quercus ilex leaves: effect of leaf side and age - Fernandez Fernandez, Victoria; Sancho-Knapik, Domingo; Guzmán Delgado, Paula; Peguero Pina, Jose Javier; Gil Sanchez, Luis; Karabourniotis, George; Khayet, Mohamed; Fasseas, Costas; Heredia-Guerrero, José Alejandro; Heredia, Antonio; Gil Pelegrín, E.
Plant trichomes play important protective functions and may have a major influence on leaf surface wettability. With the aim of gaining insight into trichome structure, composition and function in relation to water-plant surface interactions, we analyzed the adaxial and abaxial leaf surface of Quercus ilex L. (holm oak) as model. By measuring the leaf water potential 24 h after the deposition of water drops on to abaxial and adaxial surfaces, evidence for water penetration through the upper leaf side was gained in young and mature leaves. The structure and chemical composition of the abaxial (always present) and adaxial (occurring only...

4. Wettability, polarity and water absorption of Quercus ilex leaves: effect of leaf side and age - Fernandez Fernandez, Victoria; Sancho-Knapik, Domingo; Guzmán Delgado, Paula; Peguero Pina, Jose Javier; Gil Sanchez, Luis; Karabourniotis, George; Khayet, Mohamed; Fasseas, Costas; Heredia-Guerrero, José Alejandro; Heredia, Antonio; Gil Pelegrín, E.
Plant trichomes play important protective functions and may have a major influence on leaf surface wettability. With the aim of gaining insight into trichome structure, composition and function in relation to water-plant surface interactions, we analyzed the adaxial and abaxial leaf surface of Quercus ilex L. (holm oak) as model. By measuring the leaf water potential 24 h after the deposition of water drops on to abaxial and adaxial surfaces, evidence for water penetration through the upper leaf side was gained in young and mature leaves. The structure and chemical composition of the abaxial (always present) and adaxial (occurring only...

5. Probabilistic meta-analysis of risk from the exposure to Hg in artisanal gold mining communities in Colombia - Miguel García, Eduardo de; Ortega Romero, Marcelo; Gómez San Martín, Amaia; Clavijo, Diana
Colombia is one of the largest per capita mercury polluters in the world as a consequence of its artisanal gold mining activities. The severity of this problem in terms of potential health effects was evaluated by means of a probabilistic risk assessment carried out in the twelve departments (or provinces) in Colombia with the largest gold production. The two exposure pathways included in the risk assessment were inhalation of elemental Hg vapors and ingestion of fish contaminated with methyl mercury. Exposure parameters for the adult population (especially rates of fish consumption) were obtained from nation-wide surveys and concentrations of Hg...

6. Probabilistic meta-analysis of risk from the exposure to Hg in artisanal gold mining communities in Colombia - Miguel García, Eduardo de; Ortega Romero, Marcelo; Gómez San Martín, Amaia; Clavijo, Diana
Colombia is one of the largest per capita mercury polluters in the world as a consequence of its artisanal gold mining activities. The severity of this problem in terms of potential health effects was evaluated by means of a probabilistic risk assessment carried out in the twelve departments (or provinces) in Colombia with the largest gold production. The two exposure pathways included in the risk assessment were inhalation of elemental Hg vapors and ingestion of fish contaminated with methyl mercury. Exposure parameters for the adult population (especially rates of fish consumption) were obtained from nation-wide surveys and concentrations of Hg...

7. Flammability properties of thermally dried sewage sludge - Fernández Áñez, María de las Nieves; Garcia Torrent, Javier; Medic Pejic, Ljiljana
The treatment and disposal of sewage sludge is becoming an urgent need whereby different technologies were developed and integrated into the waste cycle all over the world. One of the most used technologies is the thermal drying of the sludge. Thermally dried sewage sludge has interesting properties that allow its use as an alternative fuel, but also needs some consideration from the point of view of its safe operation. The aim of this study was the research on the flammability properties of sewage sludge, including ignition sensitivity, explosion severity, thermal sensitivity and thermal stability. Furthermore relationships among those properties and...

8. Flammability properties of thermally dried sewage sludge - Fernández Áñez, María de las Nieves; Garcia Torrent, Javier; Medic Pejic, Ljiljana
The treatment and disposal of sewage sludge is becoming an urgent need whereby different technologies were developed and integrated into the waste cycle all over the world. One of the most used technologies is the thermal drying of the sludge. Thermally dried sewage sludge has interesting properties that allow its use as an alternative fuel, but also needs some consideration from the point of view of its safe operation. The aim of this study was the research on the flammability properties of sewage sludge, including ignition sensitivity, explosion severity, thermal sensitivity and thermal stability. Furthermore relationships among those properties and...

9. Characterization of spontaneous combustuion tendency of dried sewage sludge - Medic Pejic, Ljiljana; Fernández Áñez, María de las Nieves; Montenegro Mateos, Lucía; García Torrent, Javier; Ramírez Gómez, Álvaro
The general purpose of this study was the determination of the safety conditions to avoid the presence of explosive atmospheres in the wastewater industry. Eight Spanish plants located in Madrid, Barcelona and Málaga were considered and several sludge samples were taken in different seasons. The base for the assessment of the spontaneous ignition behaviour of dust accumulations is the experimental determination of the self-ignition temperature under isothermal conditions. Self-ignition temperatures at four volumes were obtained for one sample of sewage sludge, allowing their extrapolation to large storage facilities. A simple test method, based also on an isothermal study of samples,...

10. Characterization of spontaneous combustuion tendency of dried sewage sludge - Medic Pejic, Ljiljana; Fernández Áñez, María de las Nieves; Montenegro Mateos, Lucía; García Torrent, Javier; Ramírez Gómez, Álvaro
The general purpose of this study was the determination of the safety conditions to avoid the presence of explosive atmospheres in the wastewater industry. Eight Spanish plants located in Madrid, Barcelona and Málaga were considered and several sludge samples were taken in different seasons. The base for the assessment of the spontaneous ignition behaviour of dust accumulations is the experimental determination of the self-ignition temperature under isothermal conditions. Self-ignition temperatures at four volumes were obtained for one sample of sewage sludge, allowing their extrapolation to large storage facilities. A simple test method, based also on an isothermal study of samples,...

11. Ultrastructure of Plant Leaf Cuticles in relation to Sample Preparation as Observed by Transmission Electron Microscopy - Guzmán Delgado, Paula; Fernandez Fernandez, Victoria; Khayet, Mohamed; García, Maria Luisa; Fernández, Agustín; Gil Sanchez, Luis
The leaf cuticular ultrastructure of some plant species has been examined by transmission electron microscopy (TEM) in only few studies. Attending to the different cuticle layers and inner structure, plant cuticles have been grouped into six general morphological types. With the aim of critically examining the effect of cuticle isolation and preparation for TEM analysis on cuticular ultrastructure, adaxial leaf cuticles of blue-gum eucalypt, grey poplar, and European pear were assessed, following a membrane science approach. The embedding and staining protocols affected the ultrastructure of the cuticles analysed. The solubility parameter, surface tension, and contact angles with water of pure...

12. Ultrastructure of Plant Leaf Cuticles in relation to Sample Preparation as Observed by Transmission Electron Microscopy - Guzmán Delgado, Paula; Fernandez Fernandez, Victoria; Khayet, Mohamed; García, Maria Luisa; Fernández, Agustín; Gil Sanchez, Luis
The leaf cuticular ultrastructure of some plant species has been examined by transmission electron microscopy (TEM) in only few studies. Attending to the different cuticle layers and inner structure, plant cuticles have been grouped into six general morphological types. With the aim of critically examining the effect of cuticle isolation and preparation for TEM analysis on cuticular ultrastructure, adaxial leaf cuticles of blue-gum eucalypt, grey poplar, and European pear were assessed, following a membrane science approach. The embedding and staining protocols affected the ultrastructure of the cuticles analysed. The solubility parameter, surface tension, and contact angles with water of pure...

13. From plant surface to plant metabolism: the uncertain fate of foliar-applied nutrients - Fernandez Fernandez, Victoria; Brown, Patrick H.
The application of agrochemical sprays to the aerial parts of crop plants is an important agricultural practice world-wide. While variable effectiveness is often seen in response to foliar treatments, there is abundant evidence showing the beneficial effect of foliar fertilizers in terms of improving the metabolism, quality, and yields of crops. This mini-review is focused on the major bottlenecks associated with the uptake and translocation of foliar-applied nutrient solutions. A better understanding of the complex scenario surrounding the ultimate delivery of foliar-applied nutrients to sink cells and organs is essential for improving the effectiveness and performance of foliar fertilizers.

14. From plant surface to plant metabolism: the uncertain fate of foliar-applied nutrients - Fernandez Fernandez, Victoria; Brown, Patrick H.
The application of agrochemical sprays to the aerial parts of crop plants is an important agricultural practice world-wide. While variable effectiveness is often seen in response to foliar treatments, there is abundant evidence showing the beneficial effect of foliar fertilizers in terms of improving the metabolism, quality, and yields of crops. This mini-review is focused on the major bottlenecks associated with the uptake and translocation of foliar-applied nutrient solutions. A better understanding of the complex scenario surrounding the ultimate delivery of foliar-applied nutrients to sink cells and organs is essential for improving the effectiveness and performance of foliar fertilizers.

15. Molecular Dynamics Simulations of Couette flow - Martín Bautista, Juan A.; Meneghini, Julio; Theofilis, Vassilios
The first steps towards developing a continuum-molecular coupled simulations techniques are presented, for the purpose of computing macroscopic systems of confined fluids. The idea is to compute the interface wall-fluid by Molecular Dynamics simulations, where Lennard-Jones potential (and others) have been employed for the molecular interactions, so the usual non slip boundary condition is not specified. Instead, a shear rate can be imposed at the wall, which allows to obtain the properties of the wall material by means of an iterative method. The remaining fluid region will be computed by a spectral hp method. We present MD simulations of a...

16. Molecular Dynamics Simulations of Couette flow - Martín Bautista, Juan A.; Meneghini, Julio; Theofilis, Vassilios
The first steps towards developing a continuum-molecular coupled simulations techniques are presented, for the purpose of computing macroscopic systems of confined fluids. The idea is to compute the interface wall-fluid by Molecular Dynamics simulations, where Lennard-Jones potential (and others) have been employed for the molecular interactions, so the usual non slip boundary condition is not specified. Instead, a shear rate can be imposed at the wall, which allows to obtain the properties of the wall material by means of an iterative method. The remaining fluid region will be computed by a spectral hp method. We present MD simulations of a...

17. Comportamiento frente a la corrosión de armaduras de acero inoxidable - Medina Sanchez, Eduardo; Llorente, Irene; Fajardo, Santiago; M. Bastidas, David
Se presentan los resultados de la exposición a la corrosión por cloruros durante dos años de tres tipos de armaduras de acero inoxidable embebidas en probetas de mortero.

18. Comportamiento frente a la corrosión de armaduras de acero inoxidable - Medina Sanchez, Eduardo; Llorente, Irene; Fajardo, Santiago; M. Bastidas, David
Se presentan los resultados de la exposición a la corrosión por cloruros durante dos años de tres tipos de armaduras de acero inoxidable embebidas en probetas de mortero.

19. A theoretical study on the formation of iodine oxide aggregates and monohydrates - Fernandez Pacios, Luis; Galvez, O.; Martin, J. C. Gomez; Gomez, P. C.; Saiz-lopez, A.
Biotic and abiotic emissions of molecular iodine and iodocarbons from the sea or the ice surface and the intertidal zone to the coastal/polar marine boundary layer lead to the formation of iodine oxides, which subsequently nucleate forming iodine oxide particles (IOPs). Although the link between coastal iodine emissions and ultrafine aerosol bursts is well established, the details of the nucleation mechanism have not yet been elucidated. In this paper, results of a theoretical study of a range of potentially relevant aggregation reactions of different iodine oxides, as well as complexation with water molecules, are reported. Thermochemical properties of these reactions...

20. A theoretical study on the formation of iodine oxide aggregates and monohydrates - Fernandez Pacios, Luis; Galvez, O.; Martin, J. C. Gomez; Gomez, P. C.; Saiz-lopez, A.
Biotic and abiotic emissions of molecular iodine and iodocarbons from the sea or the ice surface and the intertidal zone to the coastal/polar marine boundary layer lead to the formation of iodine oxides, which subsequently nucleate forming iodine oxide particles (IOPs). Although the link between coastal iodine emissions and ultrafine aerosol bursts is well established, the details of the nucleation mechanism have not yet been elucidated. In this paper, results of a theoretical study of a range of potentially relevant aggregation reactions of different iodine oxides, as well as complexation with water molecules, are reported. Thermochemical properties of these reactions...

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