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Combining raw and compositional data to determine the spatial patterns of Potentially Toxic Elements in soils
ArticleAbstract: When considering complex scenarios involving several attributes, such as in environmental characteriPalabras claves:Compositional data, Local G-clustering, Ordinary kriging, PTEs, Relative enrichment, soil pollutionAutores:Albuquerque T., Boente C., Carlos Sierra, Fernández-Braña A., Gallego J.R., Gerassis S.Fuentes:scopusAnalyzing coastal environments by means of functional data analysis
ArticleAbstract: Here we used Functional Data Analysis (FDA) to examine particle-size distributions (PSDs) in a beachPalabras claves:Functional Cluster Analysis, Functional components analysis, Particle-size distribution, Sand sediments, Vector-based clustersAutores:Carlos Sierra, Flor G., Flor-Blanco G., Gallego J.R., Ordóñez C.Fuentes:scopusFunctional outlier detection in grain-size distribution curves of detrital sediments
ArticleAbstract: This article introduces functional outlier detection as a mathematical tool for the recognition of oPalabras claves:Coastal sediments, Functional bagplot, Functional high density region (HDR) boxplot, Grain-size curves, outlier detectionAutores:Carlos Sierra, Gallego J.R., Ordóñez C.Fuentes:scopusGeochemical composition of beach tar from the se coast of the paria peninsula, ne venezuela: Derivation from natural seepages
ArticleAbstract: Tar residues ("tarballs") occur frequently on the SE coast of the Paria Peninsula, NE Venezuela. ThiPalabras claves:Gulf of Paria, Los Bajos fault, Marine seepages, Naparima Hill Formation, organic geochemistry, Seepage oils, Tarballs, Trinidad, VENEZUELAAutores:Carlos Sierra, De Freitas K.A., Érica Lorenzo, Escobar M., Fernàndez R., Galarraga F., Gallego J.R., Gonzalo MárquezFuentes:scopusGeochemistry and chemostratigraphy of the Colón -mito juan units (campanian-maastrichtian), Venezuela: Implications for provenance, depositional conditions, and stratigraphic subdivision
ArticleAbstract: A geochemical and chemostratigraphical study was undertaken on Campanian-Maastrichtian sedimentary rPalabras claves:Chemostratigraphy, Colón -mito juan sequence, geochemistry, Lake maracaibo, Stratigraphic subdivisionAutores:Carlos Sierra, Escobar M., Esteves I.H., Gallego J.R., Gonzalo Márquez, Gutiérrez J.V., Manuel Martínez, Montilla L.Fuentes:scopusOrigin, patterns and anthropogenic accumulation of potentially toxic elements (PTEs) in surface sediments of the Avilés estuary (Asturias, northern Spain)
ArticleAbstract: Sediment quality has been assessed within the Avilés estuary, an important industrial area in the NWPalabras claves:Enrichment factors, Geostatistics, Multivariate analysis, Particulate emissions, Sediment contaminationAutores:Boado C., Carlos Sierra, Gallego J.R., Ordóñez C., Saavedra A.Fuentes:scopusPalaeoenvironmental reconstruction of Northern Spain during the last 8000 cal yr BP based on the biomarker content of the Roñanzas peat bog (Asturias)
ArticleAbstract: We determined the lipid distributions (n-alkanes, n-methyl ketones, n-alkanoic acids, 5-n-alkyl resoPalabras claves:Autores:Carlos Sierra, Díaz-Bautista A., Gallego J.R., Ortiz J.E., Torres T.Fuentes:scopusParticle size distribution fitting of surface detrital sediment using the Swrebec function
ArticleAbstract: Purpose: The development of mathematical models to accurately represent the particle size distributiPalabras claves:B parameter, Detrital sediment, Particle size distribution, Swrebec functionAutores:Carlos Sierra, J. M. Menéndez-Aguado, Peña ElizabethFuentes:scopusSediment particle size distributions apportionment by means of functional cluster analysis (FCA)
ArticleAbstract: The development of mathematical models for cluster creation has been addressed by scientists in manyPalabras claves:CLÚSTER ANALYSIS, Detrital sediment, functional data analysis, Particle size distributionAutores:Carlos Sierra, Ordóñez C., Ruiz Barzola OmarFuentes:scopus