Sample records for OXIDOS DE CARBONO (carbon oxides)
from WorldWideScience.org

Sample records 1 - 20 shown. Select sample records:



1

Óxidos de hierro libres asociados a carbono orgánico en agregados de suelos del partido de Balcarce/ Free iron oxides associated to organic carbon in soils aggregates in Balcarce county

Cabria, Fabián Néstor; Bianchini, María Rosa; Mediavilla, María Clara
2005-07-01

Resumen en español Cuando la materia orgánica es el agente estabilizador principal y la estructura de los agregados es jerárquica, el mecanismo de formación de los agregados conduce a recluir el carbono orgánico en macroagregados estables. Este concepto surge de investigaciones que estudiaron el modo en que la labranza altera la formación y degradación de agregados y, consecuentemente, la dinámica natural de la materia orgánica particulada y asociaciones órgano-minerales. No contan (mas) do con información local que corrobore cual es el contenido de carbono orgánico asociado a minerales dentro de los agregados y, además, entendiendo que una mejor información sobre la naturaleza y dinámica de las asociaciones órgano-minerales redundará en el entendimiento de la dinámica de la estructura y del secuestro y ciclo del carbono en los suelos, en este trabajo se extrajeron químicamente óxidos de hierro asociados al carbono orgánico en distintos tamaños de agregados en tres series de suelos bajo agricultura continua con labranza convencional (ACLC) y paturras cultivadas (PC). Los resultados conducen a entender que la ferrihidrita, óxido de hierro paracristalino, sería un constituyente de las asociaciones órgano-minerales. La cantidad de este mineral disminuiría bajo ACLC, pero la magnitud de este resultado no fue similar en las tres series de suelo. En los dos sistemas de manejo el hierro removido desde los óxidos de hierro asociados al carbono orgánico fue más abundante en los macroagregados que en los microagregados. Bajo ACLC el hierro disminuyó en los macroagregados y aumento en los microagregados. Nosotros sugerimos que en los suelos disturbados el secuestro de carbono orgánico asociado a minerales, ferrihidrita, entre otros, ocurriría dentro de los microagregados que finalmente son recluidos en macroagregados estables. Resumen en inglés When organic matter is the principal stabilizing agent and soil aggregates structure is hierarchical, the mechanism of formation of aggregates drives to seclude the organic carbon in stable macroaggregates. This concept comes from research about the way as tillage alters the rate of formation and degradation of aggregates and, consequently, the natural dynamic of particulate organic matter and organomineral associations. There is no local information that corroborate with (mas) in aggregates organic carbon associated to minerals and better information on the nature and dynamics of organomineral associations will lead to a greater understanding of soil structure dynamics and of carbon cycling and sequestration in soils. These were the aims of this research and free iron oxides associated to organic compounds were chemically removed from soil aggregates in three soil series under continuous cropping with conventional tillage (CCCT) and non-grazed crop-pasture (NGCP). The results showed that ferrihydrite, a low crystallinity oxide, would be part of organomineral associations. The quantity of this mineral would diminish under CCCT, but the magnitude of this result in the three soil series was different. In both management systems, the iron removed of free iron oxides associated to organic compounds was more abundant in macroaggregates than in microaggregates. Under conventional tillage, the iron diminished in macroaggregates and increased in microaggregates. We suggest that in undisturbed soils the organic carbon associated to mineral sequestration, ferrihydrite, among others, would occur within microaggregates finally confined in stable macroaggregates.

Scientific Electronic Library Online (Spanish)

2

Análisis del estado de la calidad del aire en Bogotá/ Analysis of Bogota's Air Quality

Gaitán, Mauricio; Cancino, Juliana; Behrentz, Eduardo
2007-11-01

Resumen en español Durante la presente investigación se realizó un análisis de los registros contenidos en la Red de Monitoreo de la Calidad del Aire de Bogotá. Se construyó una base de datos que fue organizada y estructurada para facilitar la validación y el análisis de la información, la cual fue utilizada para evaluar de forma cuantitativa el estado de la calidad del aire de la ciudad. Los resultados sugieren que para contaminantes como óxidos de azufre y de nitrógeno, así com (mas) o para monóxido de carbono, Bogotá no presenta en la actualidad un problema significativo de contaminación del aire. Al mismo tiempo, sin embargo, las concentraciones atmosféricas de material particulado en la ciudad tienden a encontrarse muy por encima de los niveles sugeridos por las normas de calidad del aire. Resumen en inglés During this research project we conducted an analysis of the information registered by Bogotá's air quality monitoring network. We built a database that was designed to facilitate the processes of validating and analyzing the air quality data, which were used to quantify the city's air pollution problem. Our results suggest that air pollutants such as carbon monoxide and sulfur and nitrogen oxides do not represent a major air pollution problem. At the same time, however, (mas) the particulate matter ambient air concentrations in Bogotá tend to be much higher than the levels suggested by the local air quality standards.

Scientific Electronic Library Online (Spanish)

3

SÍNTESIS DE ÓXIDOS TIPO PEROVSKITA MEDIANTE POLIMERIZACIÓN CON ÁCIDO CÍTRICO Y PROPIÓNICO/ SYNTHESIS OF PEROVKITE TYPE OXIDES BY POLYMERIZATION WITH CITRIC AND PROPIONIC ACID/ PEROVSKITAS TIPO ÓXIDO SÍNTESE POR POLIMERIZAÇÃO COM ÁCIDO CÍTRICO E PROPIÓNICO

Gómez-Cuaspud, Jairo A.; Valencia-Ríos, Jesús S.
2009-08-01

Resumen en portugués Este trabalho descreve a preparação do Perovskitas La0,75Sr0,25Co0,5Fe0,5O3 (LaSrCoFeO), utilizando uma via húmida química, através da polimerização do ácido cítrico e ácido propiônico, a obtenção de materiais para aplicações potenciais como membranas purificação materiais e eletrodos de oxigênio em células combustíveis Óxido Sólido (SOFC), pois o sólidos foram caracterizados por difração de raios X (XRD) ea microscopia eletrônica de varredura (M (mas) EV), obtendo informações sobre a formação ea pureza dos fases, morfologia, estrutura e propriedades superficiais de cada sistema, indicando que é possível obter sólidos com uma distribuição homogénea de grão, textura e relevo características, em cujo contexto, o método que envolve a polimerização com ácido cítrico apresentaram os melhores resultados. No seu conjunto, a composição foi determinada por microanálise de raios-X de energia dispersiva (EDX), indicando uma boa correlação entre as composições obtidas e propostas. A caracterização realizada, sugerem a presença de pequenas quantidades de carbono e alguns óxidos de lantânio, estrôncio e cobalto como principais poluentes, especialmente na amostra obtida por polimerização com ácido propiônico. Resumen en español En este trabajo se describe la preparación de la perovskita La0,75Sr0,25Co0,5Fe0,5O3 (LaSrCoFeO), empleando una ruta de química húmeda, mediante la polimerización con ácido cítrico y propiónico, con el propósito de obtener materiales para potenciales aplicaciones como membranas de purificación de oxígeno y como materiales electródicos en celdas de combustible de óxido sólido (SOFC). Para ello, los sólidos se caracterizaron mediante difracción de rayos X (DR (mas) X) y microscopia electrónica de barrido (SEM), con lo que se obtuvo información sobre la formación y pureza de fases, la morfología, la estructura y las propiedades superficiales de cada sistema, indicando que es posible obtener sólidos con una distribución de grano homogéneo, textura y relieve característicos, en cuyo contexto el método que involucra la polimerización con ácido cítrico mostró los mejores resultados. La composición global se determinó mediante microanálisis de rayos X de energía dispersiva (EDX), y se señaló una buena concordancia entre las composiciones propuestas y obtenidas. La caracterización realizada sugiere la presencia de pequeñas cantidades de carbono y algunos óxidos de lantano, estroncio y cobalto como principales contaminantes, específicamente en la muestra obtenida mediante la polimerización con ácido propiónico. Resumen en inglés This paper describes the preparation of La0,75Sr0,25Co0,5Fe0,5O3 (LaSrCoFeO) perovskite, using a wet chemical route, through polymerization with citric acid and propionic acid, to obtain materials for potential applications as membranes purification materials and oxygen electrodes in Solid Oxide Fuel Cells (SOFC). The solids were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM), obtaining information on the formation and purity of phases, mo (mas) rphology, structure and surface properties of each system. This indicates that it is possible to obtain solids with a homogeneous distribution of grain, texture and relief features. In this context the method involving the polymerization with citric acid showed the best results. The overall composition was determined by X-ray microanalysis of energy dispersive (EDX), indicating a good correlation between the compositions obtained and the proposed. The characterization performed suggests the presence of small amounts of carbon and some oxides of lanthanum, strontium and cobalt as major pollutants, specifically in the sample obtained by polymerization withpropionic.

Scientific Electronic Library Online (Spanish)

4

Oxidación parcial de metano a formaldehído sobre catalizadores de MoO3, Fe2O3 y ferromolibdeno/ Partial oxidation of methane to formaldehyde on MoO3, Fe2O3 and ferromolybdenum catalysts

Del Río, José Daniel; Durán, Gustavo Andrés; Orjuela Londoño, Álvaro; Sánchez, Francisco José; Guerrero Fajardo, Carlos Alberto
2007-04-01

Resumen en español Uno de los grandes retos para la catálisis ha sido la conversión directa de metano en productos químicos útiles a la industria tales como metanol y formaldehído. Actualmente el formaldehído es producido en un proceso que involucra tres pasos con gas de síntesis y metanol como productos intermedios. En este trabajo se emplearon catalizadores de MoO3, Fe2O3 y Fe2(MoO4)3 en cuatro proporciones Mo/Fe diferentes (0.5, 1, 1.5, 2). El catalizador de ferromolibdeno fue pre (mas) parado por coprecipitación. Los óxidos puros presentan mayor actividad; sin embargo, no son selectivos a formaldehído, siendo los óxidos de carbono (CO, CO2) los principales productos. Los catalizadores de ferromolibdeno mejoran la selectividad a HCHO en detrimento del grado de conversión; el contenido de molibdeno no muestra incrementos en la actividad catalítica. El aumento en la temperatura de reacción no genera un aumento en la selectividad a formaldehído. Resumen en inglés One of the main challenges for catalysis has been direct methane conversion to useful products such as methanol and formaldehyde. Formaldehyde is currently produced by a three-step industrial process with syngas and methanol as intermediate products. MoO3, Fe2O3 and Fe2(MoO4)3 catalysts were used with four different Mo/Fe molar ratios (0.5, 1, 1.5, 2) in this work. The ferromolybdenum catalyst was prepared by coprecipitation. Pure oxides are more active; however they are (mas) not formaldehyde selective, but carbon oxide (CO, CO2) selective. The ferromolybdenum catalysts showed better HCHO selectivity at low conversions; the molybdenum oxide content did not show increased in catalytic activity. Increased reaction temperature did not increase formaldehyde selectivity.

Scientific Electronic Library Online (Spanish)

5

Influencia del CaO sobre la actividad química de un fundente del sistema S CaO-MnO-SiO2 con una relación constante de MnO/SiO2/ The influence of CaO on the chemical of a flux of CaO-MnO-SiO2 system with a constant MnO/SiO2 relation

Cruz-Crespo, Amado; Quintana Puchol, Rafael; Perdomo, Lorenzo; Gómez, Carlos; García-Jacomino, Jorge L; Díaz Cedré, Eduardo
2009-03-01

Resumen en español En el presente trabajo se aborda el aumento del índice de basicidad de un fundente en su estado líquido, representado por el sistema ternario de óxidos MnO-SiO2-CaO. El incremento del índice de basicidad se realiza mediante la adición de CaO, manteniendo constante la relación porcentual MnO/SiO2 del sistema, con vistas a evaluar el comportamiento de la actividad química y su efecto sobre la composición química resultante del metal depositado por soldadura. Como r (mas) esultado se logra intensificar la transferencia del manganeso al metal depositado, a la vez que se atenúa la del silicio, el azufre, el fósforo y el carbono. Resumen en inglés This study concerns the increase in the basicity index of a flux in liquid state, represented by the ternary system of MnO-SiO2- CaO oxides. The increase of the basicity index is achieved through the addition of CaO, keeping constant the MnO/SiO2 percentage relation of the system, in order to evaluate the behaviour of the chemical activity and its effect on the chemical composition resulting from the metal deposited by welding. Results show that it is possible to intensif (mas) y the transfer of manganese to the deposited metal and, at the same time, reduce the transfer of silicon, sulfur, phosphorus and carbon.

Scientific Electronic Library Online (Spanish)

6

Variations in 13C/12C and D/H enrichment factors of aerobic bacterial fuel oxygenate degradation

Rosell Linares, Mònica; Barceló, Damià; Rohwerder, Thore; Breuer, Uta; Gehre, Matthias; Richnow, Hans Hermann
2007-02-03

Digital.CSIC (Spain)

9

Tuning of texture and surface chemistry of carbon xerogels

Mahata, N.; Pereira, M. F. R.; Suárez García, Fabián; Martínez Alonso, Amelia; Díez Tascón, Juan Manuel; Figueiredo, J. L.
2008-05-10

Digital.CSIC (Spain)

10

Tribological behaviour of titanium carbide/amorphous carbon nanocomposite coatings: From macro to the micro-scale

Sánchez López, Juan Carlos; Martínez-Martínez, D.; López Cartes, C.; Fernández Camacho, Asunción
2008-05-15

Digital.CSIC (Spain)

11

Tin–carbon composites as anodic material in Li-ion batteries obtained by copyrolysis of petroleum vacuum residue and SnO2

Tirado, J. L.; Santamaría Ramírez, Ricardo; Ortiz, G. F.; Menéndez López, Rosa M.ª; Lavela, P.; Jiménez-Mateos, J. M.; Gómez García, F. J.; Concheso Álvarez, Alejandro; Alcántara, R.
2007-04-02

Digital.CSIC (Spain)

12

Thrombin-Binding Aptamer Quadruplex Formation: AFM and Voltammetric Characterization

Diculescu, Victor Constantin; Chiorce-Paquim, Ana-Maria; Eritja Casadellà, Ramón; Oliveira-Bret, Ana Maria
2010-01-01

Digital.CSIC (Spain)

13

The limitations on organic detection in Mars-like soils by thermal volatilization–gas chromatography–MS and their implications for the Viking results

Navarro González, Rafael; Navarro, Karina F.; Rosa, José de la; Iñíguez, Enrique; Molina, Paola; Miranda, Luis D.; Morales, Pedro; Cienfuegos, Edith; Coll, Patrice; Raulin, François; Amils, Ricardo; McKay, Christopher P.
2006-10-31

Digital.CSIC (Spain)

14

The influence of single-walled carbon nanotube functionalization on the electronic properties of their polyaniline composites

Lafuente, Esperanza; Callejas, M. Alicia; Sainz, Raquel; Benito, Ana M; Maser, Wolfgang K; Sanjuán, María Luisa; Saurel, Damien; De Teresa, Jose María; Martinez, M. Teresa
2008-08-08

Digital.CSIC (Spain)

15

The Response of Carbon Metabolism and Antioxidant Defenses of Alfalfa Nodules to Drought Stress and to the Subsequent Recovery of Plants

Naya, Loreto; Ladrera, Rubén; Ramos Escribano, Javier; González, Esther M.; Arrese-Igor, César; Minchin, F. R.; Becana Ausejo, Manuel
2007-04-01

Digital.CSIC (Spain)

16

Temperature-programmed oxidation studies of carbon materials prepared from anthracites by high temperature treatment

González Fernández, David; Altin, Orhan; Eser, Semih; García Suárez, Ana Beatriz
2007-01-15

Digital.CSIC (Spain)

19

Surface characterization of Mn(x)Ge(1−x) and Cr(y)Mn(x)Ge(1−x−y) dilute magnetic semiconductors

Gambardella, Pietro; Claude, L.; Rusponi, S.; Franke, K. J.; Brune, H.; Raabe, J.; Nolting, F.; Bencok, Peter; Hanbicki, A. T.; Jonker, B. T.; Grazioli, C.; Veronese, M.; Carbone, C.
2007-03-28

Digital.CSIC (Spain)

20

Suitability of Coal/Pitch – PET Mixture for Activated Carbon Production

Lorenc-Grabowska, Ewa; Gryglewicz, Grazyna; Machnikowski, Jacek; Díez Díaz-Estébanez, M.ª Antonia; Barriocanal Rueda, Carmen
2007-01-01

Digital.CSIC (Spain)

21

Structural modification of eucalypt pulp lignin in a totally chlorine free bleaching sequence including a laccase-mediator stage

Ibarra, David; Chávez, M. Isabel; Rencoret, Jorge; Río Andrade, José Carlos del; Gutiérrez Suárez, Ana; Romero Sánchez, Javier; Camarero, Susana; Martínez Hernández, María Jesús; Jiménez-Barbero, Jesús; Martínez Ferrer, Ángel Tomás
2007-01-01

Digital.CSIC (Spain)

22

Steroidal N-nitroamines. Part 3. Pyrolitic denitroamination of N-nitroamino-adamantane and -bornane, and of several steroidal N-nitroamines

Francisco, Cosme G.; Freire, Raimundo; Hernández, Rosendo; Melián, Daniel; Salazar, José A.; Suárez, Ernesto
1983-01-01

Digital.CSIC (Spain)

23

Spectroscopic characterisation of rosaite and aurichalcite

Reddy, B. Jagannadha; Nieto, F.; Sánchez-Navas, A.
2004-07-01

Digital.CSIC (Spain)

24

Single-walled carbon nanotubes as electrodes in supercapacitors

Picó, Fernando; Rojo Martín, José María; Sanjuan Álvarez, María Luisa; Ansón Casaos, Alejandro; Benito, Ana M; Callejas, M. Alicia; Maser, Wolfgang K; Martinez, M. Teresa
2004-04-30

Digital.CSIC (Spain)

26

Simulación Numérica del Proceso de Requemado de Gases para la Reducción de Óxidos de Nitrógeno (NOx)/ Numerical Simulation of the Reburning Technology for Nitrogen Oxides (NOx) Reduction

Estrada, Meliton ; Mendoza , Crisanto ; Romero, Carlos E
2006-01-01

Resumen en español El presente trabajo tiene como objetivo desarrollar capacidades de modelado que simulen el proceso de reducción de NOx por la tecnología del requemado de gases. En el modelo cinético construido solo se consideraron algunos de los factores que determinan la producción de óxidos de nitrógeno. La emisión de NOx procedente de la combustión del carbón mineral en generadores de vapor, es un problema ambiental importante, ya que se ha demostrado que contribuye a la form (mas) ación de la lluvia ácida y del esmog troposférico. El requemado de gases proporciona una buena opción para reducir las emisiones de NOx en instalaciones donde usan calderas a carbón. Los gases de NOx emitidos por la caldera, entran a la zona de requemado y se combinan con gas natural que es inyectado para que actúe como un agente reductor. El análisis se hace para un tiempo de residencia de 0.1 y 0.2 seg., y temperaturas de gases 1,000 a 2,000 K, con concentración de gas natural de 7.5 a 35 %. Los resultados muestran una buena equivalencia de reducción de NOx comparados con el modelo de Braun aunque se puede mejorar el modelo presentado integrándolo con un modelo detallado de la mecánica de fluidos turbulenta Resumen en inglés The aim of this work was to develop modeling capabilities which could be used to simulate the processes of reduction of NOx in reburn technology. The kinetic model developed in this work considers only some of the factors that contribute to nitrogen oxide production. Emission of NOx from the combustion of coal is an important environmental problem, since it has been demonstrated that it contributes to the formation of the acid rain and of tropospheric smog. Gas reburning (mas) is a useful option for the reduction of emissions of NOx in installations equipped with coal-fired boilers. Gases from the boiler containing NOx, enter a reburning zone and are combined with natural gas that is injected in order to act as a reducing agent, which transforms the NOx into N2. Analyses were done for residence times of 0.1 and 0.2 sec., at a range of temperatures between 1,000 - 2,000 K, and natural gas concentration from 7.5 - 35 %.The results show that good agreement with those of Braun although the model could be improved integrating it with a detailed turbulent fluid mechanic model

Scientific Electronic Library Online (Spanish)

27
29

Removal of carbon films by oxidation in narrow gaps: Thermo-oxidation and plasma-assisted studies

Tanarro, Isabel; Ferreira, J. A.; Herrero, Víctor J.; Tabarés, F. L.; Gómez-Aleixandre Fernández, Cristina
2009-01-26

Digital.CSIC (Spain)

30

Regioselectivity of the reaction of 3-keto steroids with potassium superoxide

Álvarez, Enrique; Francisco, Cosme G.; Freire, Raimundo; Hernández, Rosendo; Salazar, José A.; Suárez, Ernesto; Betancor, Carmen
1986-01-01

Digital.CSIC (Spain)

31

Reducción carbotérmica de pirolusita para la obtención de ferromanganeso y escoria, adecuados al desarrollo de materiales de soldadura

Cruz Crespo, A.; García Sánchez, L. L.; Quintana Puchol, R.; Perdomo González, L.; Gómez Pérez, C. R.; Jiménez Vielsa, G. E.; Cores Sánchez, A.
2004-06-30

Digital.CSIC (Spain)

32

Reactivity of highly cycled particles of CaO in a carbonation/calcination loop

Grasa, Gemma S.; Abanades García, Juan Carlos; Alonso Carreño, Mónica; González García, Belén
2008-04-15

Digital.CSIC (Spain)

34

Radical oxidative decarboxylation of α-hydroxylactones. Influence of oxygen-carbon β-bond effect

Francisco, Cosme G.; Freire, Raimundo; Rodríguez Morales, María S.; Suárez, Ernesto
1995-03-20

Digital.CSIC (Spain)

37

Preparation of azo compounds with solid catalysts

Corma Canós, Avelino; García Gómez, Hermenegildo; Grirrane, Abdessamad
2010-03-18

Digital.CSIC (Spain)

38

Preparation of Palladium Loaded Carbon Nanotubes and Activated Carbons for Hydrogen Sorption.

Ansón, Alejandro; Lafuente, Esperanza; Urriolabeitia, Esteban P.; Navarro, Rafael; Benito, Ana M; Maser, Wolfgang K; Martínez Fernández de Landa, María Teresa
2007-06-01

Digital.CSIC (Spain)

39

Polycyclic aromatic hydrocarbons in mountain soils of the subtropical Atlantic

Ribes, Alejandra; Grimalt, Joan O.; Torres García, Carlos J.; Cuevas, E.
2003-05-01

Digital.CSIC (Spain)

40

Physicochemical properties of debris ejected from C/C brakes with different structural orders

Pevida García, Covadonga ; Jacquemard, P. ; Joly, J.-P.

9 pages, 6 figure, 4 tables.-- Printed version published Jun 2008. | Debris samples from braking tests carried out with carbon/carbon discs, mounted in a reduced-scale bench, have been studied by X-ray diffraction, thermogravimetry coupled with mass spectrometry, and N2 physisorption at −196°C. The ...

DRIVER (Spanish)

42

Organic carbon and nitrogen losses influenced by vegetation removal in a semiarid mediterranean soil

Martínez-Mena García, M. Dolores; Álvarez-Rogel, José; Castillo Sánchez, Victor Manuel; Albaladejo Montoro, Juan
2002-12-01

Digital.CSIC (Spain)

43

One-pot production of carbamates using solid catalysts

Corma Canós, Avelino; García Gómez, Hermenegildo; Juárez Marín, Raquel
2010-09-16

Digital.CSIC (Spain)

44

One-electron versus two-electron mechanisms in the oxidative addition reactions of chloroalkanes to amido-bridged rhodium complexes

Tejel, Cristina; Ciriano, Miguel A.; López, José A.; Jiménez, Sonia; Bordonaba, Marta; Oro, Luis A.
2007-01-01

Digital.CSIC (Spain)

45

Novel biodegradable aromatic plastics from a bacterial source. Genetic and biochemical studies on a route of the phenylacetyl-coa catabolon

García, Belén; Olivera, Elías R.; Miñambres Rodríguez, Baltasar; Fernández Valverde, Martiniano; Cañedo, Librada M.; Prieto, María A.; García, José L.; Martínez, María; Luengo, José M.
1999-01-01

Digital.CSIC (Spain)

46

Nitrogen in aramid-based activated carbon fibers by TPD, XPS and XANES

Boudou, J. P.; Parent, Ph.; Suárez García, Fabián; Villar Rodil, Silvia; Martínez Alonso, Amelia; Díez Tascón, Juan Manuel
2006-06-21

Digital.CSIC (Spain)

47

New metabolites in the degradation of fluorene by Arthrobacter sp. strain F101

Casellas, Mercè; Grifoll, Magdalena; Bayona Termens, Josep María; Solanas, Anna M.
1997-03-01

Digital.CSIC (Spain)

48

New atomic-scale features in graphite surfaces treated in a dielectric barrier discharge plasma

Solís Fernández, Pablo; Paredes Nachón, Juan Ignacio; Martínez Alonso, Amelia; Díez Tascón, Juan Manuel
2008-06-03

Digital.CSIC (Spain)

49

Nanopatterning of carbonaceous structures by field-induced carbon dioxide splitting with a force microscope.

García García, Ricardo; Sánchez Losilla, Nuria; Martinez, Javier; Martínez Garrido, Ramsés Valentín; Palomares, F. J.; Huttel, Y.; Calvaresi, M.; Zerbetto, Francesco
2010-04-05

Digital.CSIC (Spain)

50

N2 Fixation, Carbon Metabolism, and Oxidative Damage in Nodules of Dark-Stressed Common Bean Plants

Gogorcena Aoiz, Yolanda; Gordon, A. J.; Escuredo, P. R.; Minchin, F. R.; Witty, J. F.; Morán, José F.; Becana Ausejo, Manuel
1997-04-01

Digital.CSIC (Spain)

51

Muriceanol, A 24(28)-Epoxide Sterol Link in the Carbon Flux Toward Side-Chain Dealkylation of Sterols

Lorenzo, Manuel; Cueto, Mercedes; D'Croz, Luis; Maté, Juan L.; San Martín, Aurelio; Darias, José
2006-02-01

Digital.CSIC (Spain)

52

Multilayer graphene films grown by Molecular Beam Deposition

García, Jorge M.; He, Rui; Jiang, Mason P.; Yanb, Jun; Pinczuk, Aron; Zuev, Yuri M.; Kimb, Keun Soo; Kimb, Philip; Baldwin, Kirk; West, Ken W.; Pfeiffer, Loren N.
2010-03-07

Digital.CSIC (Spain)

54

Modeling of the Deactivation of CaO in a Carbonate Loop at High Temperatures of Calcination

González García, Belén; Grasa, Gemma S.; Alonso Carreño, Mónica; Abanades García, Juan Carlos
2008-11-03

Digital.CSIC (Spain)

55

Microwave-assisted regeneration of activated carbons loaded with pharmaceuticals

Ovín Ania, M.ª Concepción; Parra Soto, José Bernardo; Menéndez Díaz, José Ángel; Pis Martínez, José Juan
2007-05-22

Digital.CSIC (Spain)

56

Microbial transformation of 18-hydroxy-9,13-epi-ent-pimara-7,15-diene by Gibberella fujikuroi

Fraga, Braulio M.; González, Pedro; Hernández, Melchor G.; Chamy, María C.; Garbarino, Juan A.
2003-01-01

Digital.CSIC (Spain)

59

Manganese micro-nodules on ancient brick walls

López-Arce, Paula; García Guinea, Javier; García Fierro, José Luis
2002-11-13

Digital.CSIC (Spain)

60

Limewashing paintings in Alentejo urban heritage: pigment characterization and differentiation by WDXRF and XRD

Gil, M.; Carvalho, M.L.; Seruya, A.; Ribeiro, I.; Queralt Mitjans, Ignacio; Candeias, A.E.; Miräo, J.
2008-01-01

Digital.CSIC (Spain)

61

Land use and soil carbon accumulation patterns in South African

Almendros, G.; Zancada, M. C.; Pardo Fernández, María Teresa
2005-01-13

Digital.CSIC (Spain)

62

Kinetic characterization of the substrate specificity and mechanism of mushroom tyrosinase

Espín de Gea, Juan Carlos; Varón, Ramón; Fenoll, Lorena G.; Gilabert, M. Ángeles; García-Ruíz, Pedro; Tudela, José; García-Cánovas, Francisco
2000-02-01

Digital.CSIC (Spain)

63

Iron-manganese nodules in a semi-arid environment

Sanz, A.; García González, María Teresa; Vizcayno, Carmen; Rodríguez, R.
1996-01-01

Digital.CSIC (Spain)

64

Involvement of Activated Oxygen in Nitrate-Induced Senescence of Pea Root Nodules

Escuredo, P. R.; Minchin, F. R.; Gogorcena Aoiz, Yolanda; Iturbe-Ormaetxe, I.; Klucas, R. V.; Becana Ausejo, Manuel
1996-04-01

Digital.CSIC (Spain)

67

Intramolecular functionalization of amides leading to lactams

Hernández, Rosendo; Medina, María C.; Salazar, José A.; Suárez, Ernesto; Prangé, Thierry
1987-01-01

Digital.CSIC (Spain)

68

Induced reduction of the potential leachability of As, Cd and Tl in an element-spiked acid soil by the application of industrial by-products

Aguilar Carrillo, Javier; Garrido, Fernando; Barrios, Laura; García González, María Teresa
2009-01-01

Digital.CSIC (Spain)

69

Igneous Origin of CO2 in Ancient and Recent Hot-Spring Waters and Travertines from the Northern Argentinean Andes

Gibert, Roger O.; Taberner, Conxita; Sáez, Alberto; Giralt, Santiago; Alonso, Ricardo N.; Edwards, R. Lawrence; Pueyo Mur, Juan José
2009-01-01

Digital.CSIC (Spain)

70

Highly dispersed platinum nanoparticles on carbon nanocoils and their electrocatalytic performance for fuel cell reactions

Sevilla Solís, Marta; Sanchís, C.; Valdés-Solís Iglesias, Teresa; Morallón, E.; Fuertes Arias, Antonio Benito
2009-03-01

Digital.CSIC (Spain)

71

Hidrometallurgical process for the recovery of copper from oxidized metal materials

Alguacil, Francisco José; Magne Ortega, Luis; Gómez Coedo, Aurora; Navarro Donoso, Patricio; Dorado López, María Teresa; Simpson Álvarez, Jaime
1997-02-06

Digital.CSIC (Spain)

72

Formation of Bi–Sr–Ca–Cu–O superconducting films by electrodeposition

Martín González, Marisol S.; García-Jaca, Javier; Morán, Emilio; Alario-Franco, Miquel Á.
1999-09-01

Digital.CSIC (Spain)

73

Fluorescent, water dispersible polyaniline and its composites with carbon nanotube

Jimenez, Pablo; Maser, Wolfgang K; Martinez, M. Teresa; Benito, Ana M
2009-06-07

Digital.CSIC (Spain)

74

Fertilidad actual de los suelos dedicados a frutales en regadíos de la cuenca del Ebro

Montañés García, Luis; Sanz Encinas, Manuel; Heras Cobo, Luis
1975-01-01

Digital.CSIC (Spain)

75

Fe-Mn nodules associated with hydrocarbon seeps: A new discovery in the Gulf of Cadiz (Eastern Central Atlantic)

González, F. J.; Somoza, L.; Lunar, R.; Martínez-Frías, Jesús; Martín Rubí, J. A.; Torres, T.; Ortiz, J. E.; Díaz del Río, V.
2007-09-01

Digital.CSIC (Spain)

77

Exchange-bias and superparamagnetic behaviour of Fe nanoparticles embedded in a porous carbon matrix

Fernández, M. P.; Schmool, D. S.; Silva, A. S.; Sevilla Solís, Marta; Fuertes Arias, Antonio Benito; Gorria, P.; Blanco, J. A.
2008-10-22

Digital.CSIC (Spain)

78

Estructuras de deformación (¿sismitas?) en la Formación Río Negro, provincia de Río Negro, Argentina

Schillizzi, Roberto; Luna, Liliana; Falco, Juan Ignacio
2010-07-01

Resumen en español A Las estructuras de deformación (ED) en sedimentos blandos comprenden las alteraciones que se producen casi simultáneamente con la sedimentación. Estos procesos se hallan en relación directa con las características internas de los materiales sedimentarios y de los factores externos que actúan sobre ellos. Sus resultados incluyen deformaciones como inyecciones, fracturas, volcanes y laminaciones convolutas que afectan total o parcialmente la estratificación. Los se (mas) dimentos blandos deformados por sismos se incluyen bajo la denominación general de sismitas (seismites). Como objetivo de esta investigación se plantea reconocer, por primera vez, estructuras de deformación ubicadas en la Formación Río Negro presentes en el sector norte del Golfo San Matías, en inmediaciones del Faro Río Negro. La metodología empleada consistió en el reconocimiento y descripción de las estructuras, para lo cual se extrajeron muestras para determinar granulometría, mineralogía y contenido de materia orgánica. Se fotografiaron los distintos sectores con deformaciones con el fin de establecer modelos comparativos. El sector estudiado, de 4 km de extensión, se ubica entre el faro de Río Negro y el inicio del Banco Verde y morfológicamente corresponde a un frente acantilado con orientación ENE-OSO. En él se determinaron las siguientes ED: a- de carga simple, pseudonódulos contiguos y aislados, y estructuras complejas; b- de escape de fluidos y c- estructuras de deslizamiento basal y por presión dirigida. El origen de las deformaciones se debe a las características de las sedimentitas y a los procesos que las afectan tales como los efectos por carga, escapes de fluidos y las presiones dirigidas. Como origen de estos procesos se señalan: la presión de la columna litológica, las olas de tormentas y los terremotos. Por los rasgos hallados las deformaciones del litoral rionegrino tendrían un origen sísmico, proceso ocurrido en un único evento durante el ciclo Andino cuyos inicios se fijan hace aproximadamente 45 Ma. Por otra parte sus techos y bases no se hallan asociados a otros procesos de deformación y sus espesores no exceden el metro de potencia. Además se hallan acotadas a la zona de transición entre los miembros medio y superior de la Formación Río Negro descansando en algunos casos sobre arcilitas y en otros sobre limolitas, originadas en un paleorelieve de interdunas. Resumen en inglés Soft-sediment deformation structures (SSD) are alterations produced almost simultaneously with sedimentation. They are directly related to internal characteristics of sedimentary materials as well as to external factors acting on them. Results derived from such alterations are evidenced as injections, fractures, volcanoes and convolute laminations, among other forms, affecting stratification either totally or partially. Soft-sediment deformation structures resulting from (mas) seisms are known as seismites. The present study aims at determining for the first time the presence of SSD structures in the Río Negro Formation, located in the northern area of San Matías Gulf, near Río Negro Lighthouse, Argentina (Fig. 1). To this end, structures were firstly identified and further described. Samples were subsequently collected for the determination of grain-size, mineralogy and organic matter content. Photographs of the different sectors evidencing deformations were taken in order to determine further comparative models. Morphology in the study area is associated to cliffs with vertical, fractured fronts and with an average height of 70 m in whose base torn-down blocks are accumulated. The geological structure of the study area is related to the Cuenca del Colorado and the Comarca Nordpatagónica, whose basement is mainly composed of Paleozoic and Mesozoic crystalline rocks. The sedimentary tertiary cover from the Miocene-Pliocene is represented by light-blue sandstones of the Río Negro Formation (Andreis, 1965). This unit was formed in an aeolian environment with intercalations of clay-silt shallow lagoons and a marine episode located in the mid area of the Río Negro Formation. At the top of the Río Negro Formation there are Pleistocene-Holocene sedimentites having a thickness of up to 5 m. Within the local structural framework of our study area there are fractures with a NE-SW and a NW-SE direction, which are related with fractures N55º, N90º and N350º azimuth located in the abrasion platform. According to Dzulinsky and Walton (1965), Lowe (1975), Brencley and Newall (1977), Clauss (1993), van Loon (2002), Owen (2003), Neuwerth et al. (2006), Alfaro et al. (2006), Montenat et al. (2007), among others (Table 1), and, taking into account the geometry of deformations, laboratory reconstructions and field observations from our study area, it can be concluded that the classifications of SSD structures tend to establish morphologic and genetic systematizations. The following characteristics were identified in our study area: limited deformations among stratigraphic horizons; a lateral continuity of SSD structures at considerable distances; and a confinement between non-deformed strata and its lithological association with psamitic-pelitic sediments. The study area, which is 4 km long and is located between Río Negro Lighthouse and the beginning of Banco Verde, is from the morphological point of view, a cliffed front with an ENE-WSW orientation. Different types of SSD structures were identified in this area. For example, from the morphological point of view and according to the loading mechanisms observed, simple-load structures (Fig. 2), attached and detached pseudonodules (Figs. 3, 4 and 5) and complex structures (Fig. 6) were identified. Furthermore, from the genetic point of view and according to the intrusion processes observed in soft sediments, water-scape structures (Fig. 7) and plate- or fountain-like deformations (Fig. 8) were found. From the genetic point of view, and based on the collapse and pressure mechanisms observed, basal slumping (Fig. 9) and directed-pressure structures (Fig. 11) were also found. The above-mentioned SSD structures were analyzed and interpreted following Strachan´s model (2002) (Fig. 10) and Laird´s model (1968) (Fig. 12). The origin of SSD structures depends on the characteristics of sedimentites and on the mechanisms that produce them. In the study area, the materials susceptible to deformation come from an interdune environment that is characterized by granulometric variations derived from the fluctuating and restrictive climatic conditions (Cojan and Thiry, 1992) that typify the Río Negro Formation. Fine-grained materials having low cohesion and poor sorting such as the sediments of deformed strata (Fig. 13) produced SSD structures as a result of high pore pressure and liquefaction effects (Tsuchida and Hayashi, 1971; Obermeier, 1996). Grain packing with a porous value as that allows intercommunication among grains and saturated material, is also crucial to the formation of SSD structures. The mineralogic content of deformed levels is composed of i) quartz, chalcedony, orthose, plagioclase, pyroxenes and biotite, opaques (magnetite and ilmenite, autigenic pyrite) in crystalline aggregates; ii) undetermined Fe oxides; and iii) colorless and light-brown unaltered volcanic glass shards, clays identified as smectite-illite interstratified and scarce kaolinite. Grains are mainly subangular and, to a lesser extent, sub-round and round. The surface of the majority of grains in the study area was found clean and with some marks. The percentage of CaCO3 was found to vary from 0.5 to 3% and that of total organic carbon (TOC) was found to reach 1.5%. Deformations may be produced as a result of load deformation mechanisms, fluid escape, basal slumping or pressure-directed displacements. Due to load deformation mechanisms, structures are linked to gravity-related movements occurring during the initial stages of deposition. For these deformations to occur, grain-size at the overlaying levels should be thicker than at the underlying levels, for example, sandstones rather than silstones or claystones. These deformations are related to water saturation at the deformed level (fluidization-liquefaction). Therefore, deformation mechanisms, which involve both expulsion and rotation of fragments as well as fluid escape, are characterized by the action of lithostatic pressure which produces movement (deformation) and by the action of the underlying sedimentary levels. Deformations may also result from a fluid escape mechanism, i.e., from a mechanism associated to i) the spatial arrangement of grains (packing), ii) their shape, iii) their tendency to inequigranularity, and iv) the communication among macro- and micro- pores as well as the high or low sinuosity connection among themselves (Net and Limarino, 2000). Further requirements for deformations to occur include particular thixotrophic conditions, especially the presence of colloids among grains. The rupture of unions of particles either by hitting or by shearing is, among others, a cause which produces an unbalance between hydrostatic pressure and lithostatic pressure. If the latter is altered, the energetic unbalance makes fine sediments flow among the weakly lithified sandstones whose extrusion will occur via both vertical and horizontal pore ducts (Lopez Gamundi, 1986; Clauss, 1993). Basal slumping produces deformations that are associated not only to soft sediments deposited in natural slopes but also to interbedded sand- and mud-levels. Layers tend to have a prismatic-shaped geometry whose materials are under ductile-to-fragile conditions, in which antique layers support younger ones. Once horizontality is affected, movement, which is marked by a rupture of the original slope, begins. The lower levels are expected to transport the upper ones without affecting the original succession of layers. At the delay of movement derived from the compressive effect of the displacement front, fluids extrude forming cones or cut dikes (Fig. 10). Several deformations of this type initiate movement as result of differences in the hydrostatic gradient (Strachan, 2002). Deformations may be also produced as a result of pressure-directed displacements which are conditioned by the compaction level, thickness and ability of materials to deform. Thus, deformations occur because the original level is saturated in water as a result of the ductile behavior of materials (Bracco et al., 2005). Laird (1968) claims that SSD structures should meet some of the following requirements to be considered of seismic origin: slightly curved strata walls and floors to follow the original stratification and interruption of continuity of the stratum that is marked by a scar in which the sedimentary fillings keep their characteristics both above and below stratification. There could be rotated sediment clasts below the discontinuity as a result of a thrust-induced drag of the upper sedimentary packing. These processes could be, in turn, triggered either by the charge or pressure of the lithologic column, storm waves and seismicity. Storm-wave impact may also produce deformation in soft sediments. Nonetheless, no high energy structures such as cross-beddings or tsunami-type chaotic sedimentation were observed in our study area. Noteworthingly, for stormwave-derived liquefaction to occur, waves should reach magnitudes higher than 6 m (Alfaro et al., 2002), this being a phenomenon that was not recorded in our study area. Taken together, findings from the present study indicate that SSD structures in our study area are seismic alterations that occurred in an event during the Andean cycle whose beginnings are traced approximately 45 My ago. The fact that i) both the roofs and bottoms of these structures are not associated to other processes of deformation, ii) their thickness does not exceed one meter, and iii) they are confined to a transitional area between the middle and top members of the Río Negro Formation, lying in some cases on claystones and in some other cases, on siltstones, originated in an interdune paleorelief, confirms their seismic origin.

Scientific Electronic Library Online (Spanish)

79

Electrocatalytic oxidation of nitrite to nitrate mediated by Fe(III) poly-3-aminophenyl porphyrin grown on five different electrode surfaces

Armijo, Francisco; Goya, M. Carmen; Reina, Matías; Canales, M. Josefina; Arévalo, Maria Carmen; Aguirre, M. Jesús
2007-05-01

Digital.CSIC (Spain)

81

Effects of oxidative and nitrosative stress on Tetrahymena pyriformis glyceraldehydes-3-phosphate dehydrogenase

Fourrat, Latifa; Iddar, Abdelghani; Valverde, Federico; Serrano, Aurelio; Soukri, Abdelaziz
2007-07-02

Digital.CSIC (Spain)

82

Effect of stoichiometry and milling processes in the synthesis and the piezoelectric properties of KNN-modified nanoparticles by solid state

Rubio Marcos, Fernando; Romero Fanego, Juan José; Martín-González, Marisol S.; Fernández Lozano, José Francisco
2010-06-30

Digital.CSIC (Spain)

83

Easy synthesis of graphitic carbon nanocoils from saccharides

Sevilla Solís, Marta; Fuertes Arias, Antonio Benito
2009-01-15

Digital.CSIC (Spain)

84

EPD of thick films for their application in lithium batteries

Ferrari Fernández, Begoña; Moreno, Rodrigo; Hernán, L.; Melero, M.; Morales, J.; Caballero, A.
2007-01-01

Digital.CSIC (Spain)

85

Discriminating the carboxylic groups from the total acidic sites in oxidized multi-wall carbon nanotubes by means of acid–base titration

González-Guerrero, Ana Belén; Mendoza Gómez, Ernest; Pellicer, Eva; Alsina, Francesc; Fernández Sánchez, César; Lechuga, Laura M.
2008-09-10

Digital.CSIC (Spain)

86

Direct synthesis of graphitic carbon nanostructures from saccharides and their use as electrocatalytic supports

Sevilla Solís, Marta; Sanchís, C.; Valdés-Solís Iglesias, Teresa; Morallón, E.; Fuertes Arias, Antonio Benito
2008-03-04

Digital.CSIC (Spain)

87

Different Susceptibility to the Parkinson's Toxin MPTP in Mice Lacking the Redox Master Regulator Nrf2 or Its Target Gene Heme Oxygenase-1

Innamorato, Nadia G.; Jazwa, Agniezska; Rojo, Ana I.; García, Concepción; Fernández-Ruiz, Javier; Grochot-Przeczek, Anna; Stachurska, Anna; Jozkowicz, Alicja; Dulak, Jozef; Cuadrado, Antonio
2010-07-28

Digital.CSIC (Spain)

88

Determination of pyritic sulphur and organic matter contents in Spanish subbituminous coals by X-ray power diffraction

Querol, Xavier; Alastuey, Andrés; Chinchón Yepes, J. S.; Fernandez-Turiel, J. L.; López Soler, Ángel
1993-07-01

Digital.CSIC (Spain)

89

Decline in ribosomal fidelity contributes to the accumulation and stabilization of the master stress response regulator σS upon carbon starvation

Fredriksson, Åsa; Ballesteros, Manuel; Peterson, Celeste N.; Persson, Örjan; Silhavy, Thomas J.; Nyström, Thomas
2007-04-01

Digital.CSIC (Spain)

90

Decadal time-series of SeaWiFS retrieved CDOM absorption and estimated CO2 photoproduction on the continental shelf of the eastern United States

Del Vecchio, Rossana; Subramaniam, Ajit; Schollaert Uz, Stephanie; Ballabrera-Poy, Joaquim; Brown, Christopher W.; Blough, Neil V.
2009-01-17

Digital.CSIC (Spain)

91

Conversion of olive wastes to volatiles and carbon adsorbents

Petrov, Nartzislav; Budinova, Temenuzhka; Razvigorova, M.; Parra Soto, José Bernardo; Galiatsatou, P.
2008-05-08

Digital.CSIC (Spain)

92

Convergent Peripheral Pathways Catalyze Initial Glucose Catabolism in Pseudomonas putida: Genomic and Flux Analysis

Castillo, Teresa del; Ramos, Juan L.; Rodríguez-Herva, José J.; Fuhrer, Tobias; Sauer, Uwe; Duque, Estrella
2007-07-01

Digital.CSIC (Spain)

94

Comparative micro-Raman study of the Nakhla and Vaca Muerta meteorites

Rull, Fernando; Martínez-Frías, Jesús; Sansano, Antonio; Medina, J.; Edwards, H. G. M.
2004-06-16

Digital.CSIC (Spain)

95

Characterization of contaminant phases in foraminifera carbonates by electron microprobe mapping

Pena, L. D.; Cacho, I.; Calvo, Eva María; Pelejero, Carles; Eggins, S.; Sadekov, A.
2008-07-15

Digital.CSIC (Spain)

96

Carbones activos con propiedades de tamiz molecular

Manso, R.; Pajares Somoano, Jesús Alberto; Guil, J. M.; Laynez, J.
2000-08-01

Digital.CSIC (Spain)

97

Caracterização de catalisadores Cu/CeO2/Al2O3 por redução a temperatura programada e atividade para oxidação de CO

Cataluña, Renato; Baibich, Ione M.; Dallago, R. M.; Picinini, C.; Martínez Arias, Arturo; Soria Ruiz, Javier
2001-02-01

Digital.CSIC (Spain)

98

Caracterización y clasificación de los carbones cretácicos de Teruel. Relaciones entre sus características y el entorno geológico

Juan Mainar, Roberto; Ruiz, Carmen; Querol, Xavier; Fernandez-Turiel, J. L.; López Soler, Ángel
1993-01-01

Digital.CSIC (Spain)

99

Cambios inducidos en nanotubos de carbono de capa única durante los procesos de purificación

Martinez, M. Teresa; Callejas, M. Alicia; Benito, Ana M; Ansón Casaos, Alejandro; Maser, Wolfgang K; Cochet, M.; Seeger, T.; Schreiber, J.; Gordon, C.; Marhic, C.; Chauvet, O.
2004-03-01

Digital.CSIC (Spain)

100
101

Behavior of oxygen doped SiC thin films: An x-ray photoelectron spectroscopy study

Ávila, A.; Montero Herrero, Isabel; Galán, L.; Ripalda, J. María; Levy, R. A.
2001-01-01

Digital.CSIC (Spain)

102

Basin-scale changes of total organic carbon profiles in the eastern South Atlantic

Fernández Pérez, Fíz; Fernández Ríos, Aida de la Aurora; Álvarez-Salgado, Xosé Antón; Doval, M. D.
2001-01-01

Digital.CSIC (Spain)

103

An insight into pitch/substrate wetting behaviour. The effect of the substrate processing temperature on pitch wetting capacity

García Rocha, Victoria; Blanco Rodríguez, Clara; Santamaría Ramírez, Ricardo; Diestre, E. I.; Menéndez López, Rosa M.ª; Granda Ferreira, Marcos
2007-05-01

Digital.CSIC (Spain)

104

An attempt to rank copper-based catalysts used in the CO-PROX reaction

López Suárez, Irene; Valdés-Solís Iglesias, Teresa; Marbán Calzón, Gregorio
2008-01-01

Digital.CSIC (Spain)

105

Air emissions inventory of the public transport in maracaibo municipality: Part I: Passenger car/ Inventario de emisiones del transporte público en el municipio Maracaibo. Parte I: Vehículos de pasajeros de cinco puestos

Machado, Analí; García, Neyma; Huertas, José; García, Cézar; Ferrer, Ninoska; León, Roselyn; Machado, María Verónica
2004-12-01

Resumen en español En este trabajo se presenta la primera fase del Inventario de Emisiones de fuentes móviles, basado en el transporte público Censo 2001(específicamente, la categoría de unidades de automóviles colectivos), para el municipio Maracaibo. Los gases incluidos en el inventario fueron: CO, HC y NOx. La estimación se realizó mediante el uso de los Factores de Emisión promulgados por la Agencia de Protección Ambiental de los Estados Unidos (AP42-95) como método de evaluac (mas) ión rápida de las fuentes. Por medio del inventario elaborado se pudo constatar que el CO es el principal contaminante emitido a la atmósfera por parte de los vehículos automotores con 5307,88 ton/año, lo que representa un 86,42% de las emisiones totales, seguido por el HC (6,96%) y el NOx (6,62%). Igualmente, que dentro de los sectores estudiados el centro de Maracaibo es el que aporta mayor cantidad de poluentes (94.37%). Es importante enfatizar que este estudio presenta un método para evaluar las restantes categorías del transporte público, así como las del sector privado proporciona una metodología para realizar un inventario de emisiones generadas por esta fuente más real que la aplicada en Venezuela hasta los momentos y muestra los primeros resultados para determinar la contribución de los gases en la contaminación del ambiente urbano y en el efecto Isla Caliente. Resumen en inglés The first phase of mobile source emission inventory based on the 2001 census (specifically, passenger car) for the Maracaibo Municipality, is presented in this work. The estimation was carried out using the methodology developed by the U.S. Environmental Protection Agency. The following gases were included in the inventory: carbon monoxide (CO), total hydrocarbons (HC) and nitrogen oxides (NOx). It was verified using the inventory, that the main pollution emitted to the a (mas) tmosphere was the CO (5307,88 ton/year) representing the 86,42%, followed by the HC (6,96%) and NOx (6,62%). In Addition, Maracaibo downtown was the most important area that contributed to the pollution in the municipality (94,37%).This study is a tool to develop a calculus method to evaluate the remaining categories of the public transport, and also for the private sector; provides a methodology for the emission inventory generated by this source, more accurate than the applies in Venezuela and shows the first results to determine the contribution of these gases in the urban environmental pollution and the Heat Island effect.

Scientific Electronic Library Online (Spanish)

106

Activated carbon fibers from poly(p-phenylene benzobisoxazole)

Vázquez Santos, Beatriz; Martínez Alonso, Amelia; Díez Tascón, Juan Manuel
2008-02-21

Digital.CSIC (Spain)

108

A possible nitrogen crisis for Archaean life due to reduced nitrogen fixation by lightning

Navarro González, Rafael; McKay, Christopher P.; Nna Mvondo, Delphine
2001-07-05

Digital.CSIC (Spain)

109