Recursos de colección

Archivo Digital UPM (114.084 recursos)

This is an institutional repository providing access to the research output of the institution. Primarily contains thesis.

Materia = Química

Mostrando recursos 1 - 17 de 17

  1. Behaviour of some primary catalysts in air-steam gasification of sewage sludge

    Andrés Almeida, Juan Manuel de; Narros Sierra, Adolfo; Rodríguez Hurtado, María Encarnación

  2. Análisis de la evaluación e interrelación de los parámetros de calidad de las masas de agua de una cuenca : zona media de la Cuenca Hidrográfica del Guadiana

    Soriano Barroso, Miguel
    El presente trabajo de investigación, pretende realizar un estudio de la evaluación y control de los parámetros de calidad en varias masas de agua de una misma cuenca. En este sentido, se ha concretado el trabajo en las principales masas de agua de la Cuenca Hidrográfica del Guadiana, donde se encuentran, dos de los principales embalses nacionales; el embalse de La Serena, que con sus 3.219 Hm3 de capacidad es el mayor de España y el embalse de Cijara (6º de mayor capacidad del estado con 1.505 Hm3) El resto de embalses sobre los que versa el presente trabajo están, de una manera u otra forma, ligados geográfica e...

  3. Techniques to accelerate convergence of stress-controlled molecular dynamics simulations of dislocation motion

    Cereceda, D.; Perlado Martín, José Manuel; Marian, Jaime
    Dislocation mobility —the relation between applied stress and dislocation velocity—is an important property to model the mechanical behavior of structural materials. These mobilities reflect the interaction between the dislocation core and the host lattice and, thus, atomistic resolution is required to capture its details. Because the mobility function is multiparametric, its computation is often highly demanding in terms of computational requirements. Optimizing how tractions are applied can be greatly advantageous in accelerating convergence and reducing the overall computational cost of the simulations. In this paper we perform molecular dynamics simulations of ½ 〈1 1 1〉 screw dislocation motion in tungsten...

  4. Conceptual design of the liquid metal laboratory of the TECHNOFUSION facility

    Abánades Velasco, Alberto; García, A.; Casal, N.; Perlado Martín, José Manuel; Ibarra, A.
    The application of liquid metal technology in fusion devices requires R&D related to many phenomena: interaction between liquid metals and structural material as corrosion, erosion and passivation techniques; magneto-hydrodynamics; free surface fluid-dynamics and any other physical aspect that will be needed for their safe reliable operation. In particular, there is a significant shortage of experimental facilities dedicated to the development of the lithium technology. In the framework of the TECHNOFUSION project, an experimental laboratory devoted to the lithium technology development is proposed, in order to shed some light in the path to IFMIF and the design of chamber's first wall...

  5. Selective ablation with UV lasers of a-Si:H thin film solar cells in direct scribing configuration

    Lauzurica Santiago, Sara; García-Ballesteros Ramírez, Juan José; Colina Brito, Mónica; Sanchez Aniorte, Maria Isabel; Molpeceres Álvarez, Carlos Luis
    Monolithical series connection of silicon thin-film solar cells modules performed by laser scribing plays a very important role in the entire production of these devices. In the current laser process interconnection the two last steps are developed for a configuration of modules where the glass is essential as transparent substrate. In addition, the change of wavelength in the employed laser sources is sometimes enforced due to the nature of the different materials of the multilayer structure which make up the device. The aim of this work is to characterize the laser patterning involved in the monolithic interconnection process in a...

  6. Baseline of soil CO2 flux in the Hontomin site (Burgos, Spain)

    Elio Medina, Javier de; Ortega Romero, Marcelo; Caballero, Juan; García, Jerónimo Emilio; Nisi, Bárbara; Vaselli, Orlando; Tassi, Franco; Grandia, Fidel; Vilanova, Ester; Mazadiego Martínez, Luis Felipe; García-Martínez, Mª Jesús; Llamas Borrajo, Juan F.; Chacón, Enrique
    Baseline of soil CO2 flux in the Hontomin site (Burgos, Spain)

  7. Li & Pb MD Sinulations

    Fraile García, Alberto; Cuesta Lopez, Santiago; Perlado Martín, José Manuel; Caro, Alfredo
    Pb17Li is today a reference breeder material in diverse fusion R&D programs worldwide. Extracting dynamic and structural properties of liquid LiPb mixtures via molecular dynamics simulations, represent a crucial step for multiscale modeling efforts in order to understand the suitability of this compound for future Nuclear Fusion technologies. At present a Li-Pb cross potential is not available in the literature. Here we present our first results on the validation of two semi-empirical potentials for Li and Pb in liquid phase. Our results represent the establishment of a solid base as a previous but crucial step to implement a LiPb cross...

  8. Assessment of oral bioaccessibility of arsenic in playground soil in Madrid (Spain): A three-method comparison and implications for risk assessment

    Mingot Marcilla, Juan; Miguel García, Eduardo de; Chacón, Enrique
    Three methodologies to assess As bioaccessibility were evaluated using playgroundsoil collected from 16 playgrounds in Madrid, Spain: two (Simplified Bioaccessibility Extraction Test: SBET, and hydrochloric acid-extraction: HCl) assess gastric-only bioaccessibility and the third (Physiologically Based Extraction Test: PBET) evaluates mouth–gastric–intestinal bioaccessibility. Aqua regia-extractable (pseudo total) As contents, which are routinely employed in riskassessments, were used as the reference to establish the following percentages of bioaccessibility: SBET – 63.1; HCl – 51.8; PBET – 41.6, the highest values associated with the gastric-only extractions. For Madridplaygroundsoils – characterised by a very uniform, weakly alkaline pH, and low Fe oxide and organic matter...

  9. Molecular Dynamics Simulations of Lead and Lithium in Liquid Phase

    Fraile García, Alberto; Cuesta Lopez, Santiago; Perlado Martín, José Manuel
    Pb17Li is today a reference breeder material in diverse fusion R&D programs worldwide. Extracting dynamic and structural properties of liquid LiPb mixtures via molecular dynamics simulations, represent a crucial step for multiscale modeling efforts in order to understand the suitability of this compound for future Nuclear Fusion technologies. At present a Li-Pb cross potential is not available in the literature. Here we present our first results on the validation of two semi-empirical potentials for Li and Pb in liquid phase. Our results represent the establishment of a solid base as a previous but crucial step to implement a LiPb cross...

  10. Molecular dynamics simulations of lead and lithium in liquid phase

    Fraile García, Alberto; Cuesta Lopez, Santiago; Perlado Martín, José Manuel
    Pb17Li is today a reference breeder material in diverse fusion R&D programs worldwide. Extracting dynamic and structural properties of liquid LiPb mixtures via molecular dynamics simulations, represent a crucial step for multiscale modeling efforts in order to understand the suitability of this compound for future Nuclear Fusion technologies. At present a Li-Pb cross potential is not available in the literature. Here we present our first results on the validation of two semi-empirical potentials for Li and Pb in liquid phase. Our results represent the establishment of a solid base as a previous but crucial step to implement a LiPb cross...

  11. Liquid lead and Lithium. A Comprehensive molecular dynamics study

    Fraile García, Alberto; Cuesta Lopez, Santiago; Caro, Alfredo; Perlado Martín, José Manuel
    Pb17Li is today a reference breeder material in diverse fusion R&D programs worldwide. One of the main issues in these programs is the problem of liquid metals breeder blanket behavior. Structural material of the blanket should meet high requirements because of extreme operating conditions. Therefore the knowledge of eutectic properties like optimal composition, physical and thermodynamic behavior or diffusion coefficients of Tritium are extremely necessary for current designs. In particular, the knowledge of the function linking the tritium concentration dissolved in liquid materials with the tritium partial pressure at a liquid/gas interface in equilibrium, CT=f(PT), is of basic importance because...

  12. Air-steam gasification of sewage sludge in a bubbling bed reactor: Effect of alumina as a primary catalyst

    Andrés Almeida, Juan Manuel de; Narros Sierra, Adolfo; Rodríguez Hurtado, María Encarnación
    Numerous references can be found in scientific literature regarding biomass gasification. However, there are few works related to sludge gasification. A study of sewage sludge gasification process in a bubbling fluidised bed gasifier on a laboratory scale is here reported. The aim was to find the optimum conditions for reducing the production of tars and gain more information on the influx of different operating variables in the products resulting from the gasification of this waste. The variables studied were the equivalence ratio (ER), the steam-biomass ratio (SB) and temperature. Specifically, the ER was varied from 0.2 to 0.4, the SB...

  13. Behaviour of dolomite, olivine and alumina as primary catalysts in air-steam gasification of sewage sludge

    Andrés Almeida, Juan Manuel de; Narros Sierra, Adolfo; Rodríguez Hurtado, María Encarnación
    Sewage sludge gasification assays were performed in an atmospheric fluidised bed reactor using air and air–steam mixtures as the gasifying agents. Dolomite, olivine and alumina are three well known tar removal catalysts used in biomass gasification processing. However, little information is available regarding their performance in sewage sludge gasification. The aim of the current study was to learn about the influence of these three catalysts in the product distribution and tar production during sewage sludge gasification. To this end, a set of assays was performed in which the temperature (750–850 °C), the in-bed catalyst content (0, 10 and 15 wt.%)...

  14. Influence of the stop/start system on CO2 emissions of a diesel vehicle in urban traffic

    Fonseca González, Natalia Elizabeth; Casanova Kindelán, Jesús; Valdés del Fresno, Manuel
    This paper presents measurements of CO2 emission and efficiency of stop/start technology on a diesel vehicle in urban traffic. Two four-wheel-drive diesel vehicles with on-board exhaust emission and vehicle activity measurement systems were tested in two urban driving circuits representative of downtown Madrid. The vehicles had similar turbocharged and intercooled diesel engines fulfilling the same Euro 4 emissions regulation; but one had an improved engine incorporating stop/start technology. CO2 emission reduction of more than 20% for the car equipped with the stop/start system was obtained. Regardless of the variability in driving style, the grade and type of streets, traffic congestion,...

  15. Sensitivity analysis of WRF for integrated assessment modelling in Spain

    Alexandrov, Vassil N.; Borge García, Rafael; Lumbreras Martin, Julio; Rodríguez Hurtado, María Encarnación
    SIMCA (Air quality integrated assessment modelling system for the Iberian Peninsula) is a research project funded by the Spanish Ministry of Environment. Assessment and comparison of environmental policies and control Strategies. Multiscale and multipollutant approach Based on national projections from the Spain’s Emission Projection (SEP) project.

  16. Methodology to quantify the effect of policies and measures in emission reductions from road transport

    Lumbreras Martin, Julio; Guijarro Lomeña, Alberto; López Martínez, José María; Rodríguez Hurtado, María Encarnación
    Atmospheric emissions from road transport have increased all around the world since 1990 more rapidly than from other pollution sources. Moreover, they contribute in more than 25% to total emissions, in the majority of European countries. This situation confirms the importance of road transport when complying with emission ceilings (e.g. Kyoto Protocol and National Emissions Ceilings Directive). The developed methodology illustrates the effect on transport emissions of the most influential variables and their relationships. Therefore, it would be a policy instrument to design emission reduction measures. Firstly, the influence of the main variables was studied: mileage or mobility (passengers or...

  17. Quantification of the effect of both technical and non-technical measures from road transport on Spain's emissions projections

    López Martínez, José María; Lumbreras Martin, Julio; Guijarro Lomeña, Alberto; Rodríguez Hurtado, María Encarnación
    Atmospheric emissions from road transport have increased all around the world since 1990 more rapidly than from other pollution sources. Moreover, they contribute to more than 25% of total emissions in the majority of the European Countries. This situation confirms the importance of road transport when complying with emission ceilings (e.g. Kyoto Protocol and National Emissions Ceilings Directive). A methodology has been developed to evaluate the effect of transport measures on atmospheric emissions (EmiTRANS). Its application to Spain in the horizon of 2020 allows the quantification of the effect of several measures on emission reductions. This quantification was done through...

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