Search results for: S. Martínez-Martínez

Items from 1 to 20 out of 39 results

article

Investigation of use of coal fly ash in eco-friendly construction materials: fired clay bricks and silica-calcareous non fired bricks

D. Eliche-Quesada, J.A. Sandalio-Pérez, S. Martínez-Martínez, L. Pérez-Villarejo, more

Ceramics International > 2018 > 44 > 4 > 4400-4412

The use of coal fly ash (CFA) as raw material for the manufacture of two construction materials, fired clay bricks and silica-calcareous non-fired bricks, was investigated. Fired clay bricks were manufactured using a commercial clay and different waste ratios (0–50wt%), moulded at 10MPa and fired at 1000 ºC (4h). Silica-calcareous non-fired bricks were prepared using two wastes as raw material: CFA...

article

Assessment of metals behaviour in industrial soil using sequential extraction, multivariable analysis and a geostatistical approach

M Gabarrón, A. Faz, S. Martínez-Martínez, R. Zornoza, more

Journal of Geochemical Exploration > 2017 > 172 > C > 174-183

The main objectives of this study were to evaluate the degree of Pb, Cu, Zn, Cd, Cr and Ni pollution using pollution indexes and geostatistical approach, and to assess metals dynamic using sequential extraction procedure and multivariable statistical analysis in surface soils and soil profiles from an industrial complex as a base for a correct management in order to avoid health and environmental...

article

Molecular analysis of lungs from pigs immunized with a mutant transferrin binding protein B-based vaccine and challenged with Haemophilus parasuis

S. Martínez-Martínez, E.F. Rodríguez-Ferri, R. Frandoloso, J.J. Garrido-Pavón, more

Comparative Immunology, Microbiology and Infectious Diseases > 2016 > 48 > C > 69-78

The molecular analysis of pigs vaccinated with a mutant transferrin-binding protein B (Y167A) from Haemophilus parasuis was compared with that performed for unvaccinated challenged (UNCH) and unvaccinated unchallenged (UNUN) pigs. Microarray analysis revealed that UNCH group showed the most distinct expression profile for immune response genes, mainly for those genes involved in inflammation or immune...

article

Impact of relative position vehicle-wind blower in a roller test bench under climatic chamber

P. Fernández-Yáñez, O. Armas, S. Martínez-Martínez

Applied Thermal Engineering > 2016 > 106 > C > 266-274

In terms of energy efficiency and exhaust emissions control, an appropriate design of cooling systems of climatic chambers destined to vehicle certification and/or perform scientific research is becoming increasingly important. European vehicle emissions certification (New European Driving Cycle, NEDC) establishes the position of the wind-simulation blower at 200mm above floor level. This height is...

article

Sulfiding effects on ZnS thin films obtained by evaporation technique

S. Martínez-Martínez, S.A. Mayén-Hernández, F. de Moure-Flores, Ma.C. Arenas-Arrocena, more

Vacuum > 2016 > 130 > C > 154-158

ZnS thin films were grown on a glass substrate using physical vapor deposition techniques at room temperature. Subsequently, the thin films were annealed in three different atmospheres: vacuum, nitrogen-sulfur and vacuum-sulfur. In order to sulfurize the thermal treatment atmosphere within CSS equipment, a graphite box was designed that maintained sulfur in its steam phase while all of the intervals...

article

Ceramics from clays and by-product from biodiesel production: Processing, properties and microstructural characterization

S. Martínez-Martínez, L. Pérez-Villarejo, D. Eliche-Quesada, B. Carrasco-Hurtado, more

Applied Clay Science > 2016 > 121-122 > C > 119-126

The production of biodiesel generates a by-product called glycerine which contains glycerol that cannot be re-integrated into the same manufacturing process. The ceramic bricks are an interesting option to set in their structure a wide range of by-products and residues materials and composites, sometimes serving only as a reservoir for the inert residue, and other, having a positive effect on the...

chapter

Metal Pollution by Gold Mining Activities in the Sunchulli Mining District of Apolobamba (Bolivia)

T. Teran, Angel Faz Cano, M.A. Munoz, J.A. Acosta, more

Land Degradation and Desertification: Assessment, Mitigation and Remediation > Land Degradation and Mitigation in the Americas > 605-617

The Sunchullí district is located inside of the National Integrated Management Area of Apolobamba in Bolivia where intense gold mining activities have been carried out since ancient times to the present but with very poor gold extraction and mineral processing technology where mercury is still being used in the amalgamation processes. The aim of this work thus was to evaluate the heavy metal pollution...

chapter

Roman Mining Landscapes in the Murcia Region, SE Spain: Risk Assessment of Mine Ponds

A. Faz Cano, A. Zanuzzi, P. Martinez-Pagan, J. Acosta, more

Sustainable Land Management > 293-310

The Mining District of Cartagena-La Unión (SE Spain), mined since the Roman period, exhibits high levels of metal contamination and this poses a great risk to the surrounding environment. This chapter presents the results of the application of geophysical, geochemical and hydrological techniques in two mine ponds located in this area. Its aim is to determine their degree of contamination by heavy...

chapter

Risk Assessment in Soils Developed on Metamorphic and Igneous Rocks Using Heavy Metal Sequential Extraction Procedure

S. Martínez-Martínez, Angel Faz Cano, Gerhard Gerold, J.A. Acosta, more

Land Degradation and Desertification: Assessment, Mitigation and Remediation > Land Degradation and Mitigation in Europe > 569-580

Six areas developed on metamorphic and igneous parent materials were selected in Murcia Province (SE Spain), two from diabases, two from mica schist and two from andesites. Three of them potentially polluted by anthropogenic sources and the other three no polluted. One profile and 6 surface samples were collected from each one in order to identify the Pb and Zn concentrations bounded to different...

article

Influence of population density on the concentration and speciation of metals in the soil and street dust from urban areas

J.A. Acosta, M. Gabarrón, A. Faz, S. Martínez-Martínez, more

Chemosphere > 2015 > 134 > Complete > 328-337

Street dust and soil from high, medium and low populated cities and natural area were analysed for selected physical–chemical properties, total and chemical speciation of Zn, Pb, Cu, Cr, Cd, Co, Ni to understand the influence of human activities on metal accumulation and mobility in the environment. The pH, salinity, carbonates and organic carbon contents were similar between soil and dust from the...

article

Main factors controlling microbial community structure and function after reclamation of a tailing pond with aided phytostabilization

R. Zornoza, J.A. Acosta, S. Martínez-Martínez, A. Faz, more

Geoderma > 2015 > 245-246 > Complete > 1-10

Reclamation on bare tailing ponds has the potential to represent soil genesis in Technosols favoring the understanding of the changes of microbial communities and function. In this study we used phytostabilization aided with calcium carbonate and pig slurry/manure to reclaim an acidic bare tailing pond with the aim of investigating the effect of amending and different species on microbial community...

article

Partitioning of heavy metals over different chemical fraction in street dust of Murcia (Spain) as a basis for risk assessment

J.A. Acosta, A. Faz, K. Kalbitz, B. Jansen, more

Journal of Geochemical Exploration > 2014 > 144 > Part B > 298-305

Dust samples were collected from urban, suburban, industrial, highways, and natural sites from the vicinity of Murcia City, Spain. Chemical and physical properties were determined as well as the partitioning of the heavy metals Cu, Pb, Zn and Cd over exchangeable pools, association with carbonates, oxides, organic complexes and a residual phase.The results showed differences in the concentrations...

article

Marble wastes and pig slurry improve the environmental and plant-relevant properties of mine tailings

S. Kabas, A. Faz, J. A. Acosta, J. M. Arocena, more

Environmental Geochemistry and Health > 2014 > 36 > 1 > 41-54

Poor soil fertility is often the biggest challenge to the establishment of vegetation in mine wastes deposits. We conducted field trials in the El Gorguel and El Lirio sites in SE Spain, two representative tailing ponds of similar properties except for pH, to understand the environmental and plant-relevant benefits of marble waste (MW) and pig slurry (PS) applications to mine tailings. Low pH (5.4)...

article

Assessment of the lead and zinc contents in natural soils and tailing ponds from the Cartagena-La Unión mining district, SE Spain

S. Martínez-Martínez, J.A. Acosta, A. Faz Cano, D.M. Carmona, more

Journal of Geochemical Exploration > 2013 > 124 > Complete > 166-175

Seven tailing ponds and two natural areas (soils developed on ferruginous limestone and soils developed on laminated limestone) from a Pb/Zn mining district from southeast Spain were sampled and geochemically characterized. The objectives of this study were to: 1) evaluate the degree of pollution of the area using the enrichment factor, the geo-accumulation index and a combined pollution index; 2)...

article

Metal content and environmental risk assessment around high-altitude mine sites

M. A. Muñoz, A. Faz, J. A. Acosta, S. Martínez-Martínez, more

Environmental Earth Sciences > 2013 > 69 > 1 > 141-149

Gold mining activities in Apolobamba area, northwest of La Paz, Bolivia have created serious environmental concern and great risk to human health. The current methods used to extract gold are too primitive resulting in metal contamination of soil and water. The objectives of this study were to: (1) determine the degree of metal pollution, and (2) assess the risk to human health and environment in...

article

Effect of marble waste and pig slurry on the growth of native vegetation and heavy metal mobility in a mine tailing pond

S. Kabas, A. Faz, J.A. Acosta, R. Zornoza, more

Journal of Geochemical Exploration > 2012 > 123 > Complete > 69-76

The effect of marble waste and pig slurry on the growth of native vegetation and heavy metal mobility in an abandoned Pb-Zn-Cd tailing pond (southeast Spain) has been investigated. Different treatments were carried out in four plots, (1) pig slurry, (2) marble waste, (3) marble waste+pig slurry, and (4) control. Plant cover, richness, biodiversity, metal in plant tissues, soil physicochemical properties...

article

Valorization of biodiesel production residues in making porous clay brick

D. Eliche-Quesada, S. Martínez-Martínez, L. Pérez-Villarejo, F.J. Iglesias-Godino, more

Fuel Processing Technology > 2012 > 103 > Complete > 166-173

In this study, use of waste produced in biodiesel production plants, as spent earth from biodiesel filtration and the by-product of glycerine, in producing lightweight structural bricks have been investigated. XRD, XRF and TGA–DTA analysis of the waste and clay were performed. Samples containing up to 20mass% spent earth from biodiesel filtration and up to 15mass% glycerine have been fired at 1050°C...

article

Manufacturing new ceramic materials from clay and red mud derived from the aluminium industry

L. Pérez-Villarejo, F.A. Corpas-Iglesias, S. Martínez-Martínez, R. Artiaga, more

Construction and Building Materials > 2012 > 35 > Complete > 656-665

The main goal of this study is to manufacture ceramic materials by adding the highly hazardous waste “red mud” to a ceramic matrix and neutralizing this waste in the matrix. The optimal proportion of mud to clay was found to be 50%. The samples manufactured were analyzed using XRD to determine the crystalline phases generated, and the microstructure was analyzed using a scanning electron microscope...

article

A criterion for the transition from wall to core peak gas volume fraction distributions in bubbly flows

S. Mendez-Diaz, R. Zenit, S. Chiva, J.L. Muñoz-Cobo, more

International Journal of Multiphase Flow > 2012 > 43 > Complete > 56-61

It has been observed by many authors that for ascending bubbly flows, the gas fraction distributes radially in different manners. Depending on the flow conditions and channel characteristics, the bubbles may accumulate in the center of the pipe (core peak) or near the walls (wall peak). The radial distribution of gas fraction significantly affects the friction coefficient and the heat transfer. Therefore,...

article

Modeling the thermo-hydraulic performance of direct fired heaters for crude processing

A. Morales-Fuentes, G.T. Polley, M. Picón-Núñez, S. Martínez-Martínez

Applied Thermal Engineering > 2012 > 39 > Complete > 157-162

Although fouling in heat exchangers for crude processing has received much attention in recent years, the problem still remains unsolved and the economic losses associated to it are significant. Development and application of fouling models due to coke deposition on the heat transfer surface have been achieved with a high degree of certainty for situations where single phase occurs. Fouling rates...

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Search results for: S. Martínez-Martínez

Investigation of use of coal fly ash in eco-friendly construction materials: fired clay bricks and silica-calcareous non fired bricks

Assessment of metals behaviour in industrial soil using sequential extraction, multivariable analysis and a geostatistical approach

Molecular analysis of lungs from pigs immunized with a mutant transferrin binding protein B-based vaccine and challenged with Haemophilus parasuis

Impact of relative position vehicle-wind blower in a roller test bench under climatic chamber

Sulfiding effects on ZnS thin films obtained by evaporation technique

Ceramics from clays and by-product from biodiesel production: Processing, properties and microstructural characterization

Metal Pollution by Gold Mining Activities in the Sunchulli Mining District of Apolobamba (Bolivia)

Roman Mining Landscapes in the Murcia Region, SE Spain: Risk Assessment of Mine Ponds

Risk Assessment in Soils Developed on Metamorphic and Igneous Rocks Using Heavy Metal Sequential Extraction Procedure

Influence of population density on the concentration and speciation of metals in the soil and street dust from urban areas

Main factors controlling microbial community structure and function after reclamation of a tailing pond with aided phytostabilization

Partitioning of heavy metals over different chemical fraction in street dust of Murcia (Spain) as a basis for risk assessment

Marble wastes and pig slurry improve the environmental and plant-relevant properties of mine tailings

Assessment of the lead and zinc contents in natural soils and tailing ponds from the Cartagena-La Unión mining district, SE Spain

Metal content and environmental risk assessment around high-altitude mine sites

Effect of marble waste and pig slurry on the growth of native vegetation and heavy metal mobility in a mine tailing pond

Valorization of biodiesel production residues in making porous clay brick

Manufacturing new ceramic materials from clay and red mud derived from the aluminium industry

A criterion for the transition from wall to core peak gas volume fraction distributions in bubbly flows

Modeling the thermo-hydraulic performance of direct fired heaters for crude processing

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