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23 results on '"Martínez-Blanes, José María"'

3. Unlocking archaeological data online via the PEPAdb (Prehistoric Europe’s Personal Adornment Database) initiative for Open Science

Author

Universidad de Sevilla. Departamento de Prehistoria y Arqueología, Universidad de Sevilla. Departamento de Química Inorgánica, Ministerio de Ciencia e Innovación (MICIN). España, Romero García, Galo, Sánchez Gómez, Daniel, Garrido Cordero, José Ángel, Martínez Blanes, José María, Sousa, Ana C., Odriozola Lloret, Carlos Patricio, Universidad de Sevilla. Departamento de Prehistoria y Arqueología, Universidad de Sevilla. Departamento de Química Inorgánica, Ministerio de Ciencia e Innovación (MICIN). España, Romero García, Galo, Sánchez Gómez, Daniel, Garrido Cordero, José Ángel, Martínez Blanes, José María, Sousa, Ana C., and Odriozola Lloret, Carlos Patricio

Abstract

PEPAdb (Prehistoric Europe’s Personal Adornment Database) is a long-term, open-ended project that aims to improve access to archaeological data online. Its website (https://pepadb.us.es) publishes and analyses datasets about prehistoric personal adornment, drawing on the results of various research projects and bibliographic references.

Published
2024

4. A supervised multiclass framework for mineral classification of Iberian beads.

Author

Sanchez-Gomez, Daniel, Odriozola Lloret, Carlos P., Sousa, Ana Catarina, Garrido-Cordero, José Ángel, Romero-García, Galo, Martínez-Blanes, José María, Edo I. Benaiges, Manel, Villalobos-García, Rodrigo, and Gonçalves, Victor S.

Subjects
MACHINE learning, X-ray fluorescence, CLASSIFICATION, MINERALS, INSURANCE costs, WORKFLOW, EMPIRICAL research, NAIVE Bayes classification
Abstract

Research on personal adornments depends on the reliable characterisation of materials to trace provenance and model complex social networks. However, many analytical techniques require the transfer of materials from the museum to the laboratory, involving high insurance costs and limiting the number of items that can be analysed, making the process of empirical data collection a complicated, expensive and time-consuming routine. In this study, we compiled the largest geochemical dataset of Iberian personal adornments (n = 1243 samples) by coupling X-ray fluorescence compositional data with their respective X-ray diffraction mineral labels. This allowed us to develop a machine learning-based framework for the prediction of bead-forming minerals by training and benchmarking 13 of the most widely used supervised algorithms. As a proof of concept, we developed a multiclass model and evaluated its performance on two assemblages from different Portuguese sites with current mineralogical characterisation: Cova das Lapas (n = 15 samples) and Gruta da Marmota (n = 10 samples). Our results showed that decisión-tres based classifiers outperformed other classification logics given the discriminative importance of some chemical elements in determining the mineral phase, which fits particularly well with the decision-making process of this type of model. The comparison of results between the different validation sets and the proof-of-concept has highlighted the risk of using synthetic data to handle imbalance and the main limitation of the framework: its restrictive class system. We conclude that the presented approach can successfully assist in the mineral classification workflow when specific analyses are not available, saving time and allowing a transparent and straightforward assessment of model predictions. Furthermore, we propose a workflow for the interpretation of predictions using the model outputs as compound responses enabling an uncertainty reduction approach currently used by our team. The Python-based framework is packaged in a public repository and includes all the necessary resources for its reusability without the need for any installation. [ABSTRACT FROM AUTHOR]

Published
2024
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6. Microstructural characterization and thermal stability of He charged amorphous silicon films prepared by magnetron sputtering in helium

Author

Universidad de Sevilla. Departamento de Química Inorgánica, Universidad de Sevilla. Departamento de Ingeniería y Ciencia de los Materiales y del Transporte, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Universidad de Sevilla. FQM187: Nuevos Materiales a partir de Silicatos Naturales, Universidad de Sevilla. RNM138: Física Nuclear Aplicada, Junta de Andalucía (Spain) and EU FEDER grant RTI2018-093871-BI00, Junta de Andalucía (Spain) and EU FEDER grant P20-00239, Junta de Andalucía (Spain) and EU FEDER grant PID2021-124439NB-I00, CSIC grant 202160E029, Fernández Camacho, Asunción, Sauvage, Thierry, Diallo, Babacar, Hufschmidt, Dirk, Jiménez de Haro, María del Carmen, Montes Amorín, Olga, Martínez Blanes, José María, Caballero Hernández, Jaime, Fortio Godinho, Vanda Cristina, Ferrer Fernández, Francisco Javier, Ibrahim, Sara, Brault, Pascal, Thomann, Anne Lise, Universidad de Sevilla. Departamento de Química Inorgánica, Universidad de Sevilla. Departamento de Ingeniería y Ciencia de los Materiales y del Transporte, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Universidad de Sevilla. FQM187: Nuevos Materiales a partir de Silicatos Naturales, Universidad de Sevilla. RNM138: Física Nuclear Aplicada, Junta de Andalucía (Spain) and EU FEDER grant RTI2018-093871-BI00, Junta de Andalucía (Spain) and EU FEDER grant P20-00239, Junta de Andalucía (Spain) and EU FEDER grant PID2021-124439NB-I00, CSIC grant 202160E029, Fernández Camacho, Asunción, Sauvage, Thierry, Diallo, Babacar, Hufschmidt, Dirk, Jiménez de Haro, María del Carmen, Montes Amorín, Olga, Martínez Blanes, José María, Caballero Hernández, Jaime, Fortio Godinho, Vanda Cristina, Ferrer Fernández, Francisco Javier, Ibrahim, Sara, Brault, Pascal, and Thomann, Anne Lise

Abstract

Sputtering of silicon in a Helium magnetron discharge has been reported as a bottom-up procedure to obtain amorphous Si films containing high amounts of gas-filled nanopores. Here we compare the microstructure and composition of Si–He nanocomposite films deposited by magnetron sputtering (MS) with 4He in DC or RF and 3He in RF operation modes. Electron microscopy (SEM and TEM), X-ray diffraction (XRD) and ion beam analysis (IBA) have been used to analyze the films and to investigate the in-situ and ex-situ thermal evolution. Depending on deposition conditions different in depth compositions, nanopore size and shape distributions, porosity and He content could be obtained. The presence of impurities (i.e. oxygen) has shown to promote He diffusivity reducing He accumulation. The start temperature of He-release varied in the range 473–723 K without films crystallization. Films grown in RF mode reached contents of 32 and 29 at% of 4He and 3He and were respectively stable up to 573 and 723 K both in vacuum and under inert gas flow. In-situ p-EBS (proton Elastic Back Scattering) allowed monitoring the He release accompanied by blistering/delamination effects visualized by SEM. These results show the potentiality of annealing to hold nano-porous structures after liberation of trapped gas.

Published
2023

8. Polychromy in Roman Portraits from Asido (Medina Sidonia, Cádiz, Spain). Livia, Germanicus and Drusus Minor

Author

Universidad de Sevilla. Departamento de Prehistoria y Arqueología, Odriozola Lloret, Carlos Patricio, Beltrán Fortes, José, Loza Azuaga, María Luisa, Martínez Blanes, José María, Universidad de Sevilla. Departamento de Prehistoria y Arqueología, Odriozola Lloret, Carlos Patricio, Beltrán Fortes, José, Loza Azuaga, María Luisa, and Martínez Blanes, José María

Abstract

This paper presents a recent study on a Roman period marble sculpture depicting Empress Livia and the portraits of Germanicus and Drusus Minor, found at the praesidium of Asido (Medina Sidonia, Cádiz, Spain). The sculptures retain extensive evidence of their original polychromy. The properties and spatial distribution of these pigment remains were investigated by portable non-invasive and micro-destructive techniques, applying digital microscopy, and UV/ VIS/NIR/SWIR spectroscopy, portable XRF and SEM–EDS analysis. The study revealed the presence of Egyptian blue and ochre on Livia’s mantle and charcoal black on Livia’s eyes and hair, remains that were not clearly visible to the naked eye. This is a significant approach, used to identify colours on ancient marble sculpture, which transforms our understanding of these unique pieces. Elemental composition analysis by pXRF has confirmed the evidence of pigments, furthermore supported by the Raman results, making it possible to develop and reconstruct the colour palette that originally brought these sculptures to life in vibrant polychrome. The research offers a new methodology for identifying pigments on marble sculpture and opens new ways for investigating other types of material culture aided by the development of the analytical equipment mentioned.

Published
2022

9. Polychromy in Roman Portraits from Asido (Medina Sidonia, Cádiz, Spain). Livia, Germanicus and Drusus Minor

Author

Odriozola, Carlos, Beltrán Fortes, José, Loza Azuaga, María Luisa, Martínez Blanes, José María, Repositório da Universidade de Lisboa, and Universidad de Sevilla. Departamento de Prehistoria y Arqueología

Subjects
Roman Portrait, Archeology, Materials Science (miscellaneous), Archeometry, Livia, Roman Sculpture, Polychromy, Conservation, Archaelogical Museum of Cádiz, Computer Science Applications, Chemistry (miscellaneous), Análisis de policromía, Arqueometría, Escultura, Archaeological Museum of Cádiz, Spectroscopy
Abstract

This paper presents a recent study on a Roman period marble sculpture depicting Empress Livia and the portraits of Germanicus and Drusus Minor, found at the praesidium of Asido (Medina Sidonia, Cádiz, Spain). The sculptures retain extensive evidence of their original polychromy. The properties and spatial distribution of these pigment remains were investigated by portable non-invasive and micro-destructive techniques, applying digital microscopy, and UV/VIS/NIR/SWIR spectroscopy, portable XRF and SEM–EDS analysis. The study revealed the presence of Egyptian blue and ochre on Livia’s mantle and charcoal black on Livia’s eyes and hair, remains that were not clearly visible to the naked eye. This is a signifcant approach, used to identify colours on ancient marble sculpture, which transforms our understanding of these unique pieces. Elemental composition analysis by pXRF has confrmed the evidence of pigments, furthermore supported by the Raman results, making it possible to develop and reconstruct the colour palette that originally brought these sculptures to life in vibrant polychrome. The research ofers a new methodology for identifying pigments on marble sculpture and opens new ways for investigating other types of material culture aided by the development of the analytical equipment mentioned. info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/HAR2017-89004-P/Proyecto Colonia Aelia Augusta Italica. Arqueología del Sector Ne de la Vetus Urbs de Italica en el Marco del Proceso de Romanización en el Guadalquivir Inferior

Published
2022

11. Mineral adornments at chalcolithic sites in inland Iberia: variscite beads at Valle de las Higueras (Huecas, Toledo) Spain

Author

Barroso Bermejo, Rosa, Odriozola Lloret, Carlos Patricio, Bueno Ramírez, Primitiva, Villalobos García, Rodrigo, Balbín Behrmann, Rodrigo de, Martínez Blanes, José María, Universidad de Sevilla. Departamento de Prehistoria y Arqueología, and Universidad de Sevilla. Departamento de Química Inorgánica

Subjects
Mineralogical analysis, Variscite, Western Europe, Necropolis, Copper Age, Adornments, Iberian Peninsula
Abstract

The study of adornments found in the necropolis at Valle de las Higueras (Huecas, Toledo) has determined the morphotypology and mineral composition of one quadrangular pendant and 341 stone beads. Most of the beads are short (length ≤ 5 mm), but within this regularity series can be differentiated that might be the result of standardised fabrication processes and different times of acquisition. Portable X-ray fluorescence (p-XRF) and X-ray diffraction (XRD) analysis identified the use of phyllosilicates as sepiolite and clinochlore, and above all variscite, a mineral that became especially important for adornments in the Iberian Peninsula in the 3rd millennium BC. The inland location of the necropolis, distant from source areas, certifies its remote origin, as far away as northwest Zamora according to the chronological framework. It is still not possible to determine for sure the source of the variscite at Valle de las Higueras. However, the inland location of the necropolis, distant from source areas, certifies its remote origin. The chronology suggests that it might have come from the north-west, in the area of Zamora. Archaeological and chronological data obtained in tombs in the necropolis, together with other inland sites, contribute to understanding variscite circulation in the Iberian Peninsula in the Chalcolithic. It was restricted to a few individuals, both adults and children, who wore necklaces and bracelets. Distance did not condition the arrival of variscite, but the small amounts suggest it was traded together with other ostentation elements, such as sea shells, cinnabar and amber. The heterogeneous regional panorama displays differences in the demand, use and acquisition of variscite depending on the socioeconomic organisation and connection to exchange networks.

Published
2021

12. Amber imitation? Two unusual cases of Pinus resin-coated beads in Iberian Late Prehistory (3rd and 2nd millennia BC)

Author

Universidad de Sevilla. Departamento de Química Inorgánica, Universidad de Sevilla. Departamento de Prehistoria y Arqueología, Odriozola Lloret, Carlos Patricio, Garrido Cordero, José Ángel, Daura, Joan, Sanz, Montserrat, Martínez Blanes, José María, Avilés Escaño, Miguel Ángel, Universidad de Sevilla. Departamento de Química Inorgánica, Universidad de Sevilla. Departamento de Prehistoria y Arqueología, Odriozola Lloret, Carlos Patricio, Garrido Cordero, José Ángel, Daura, Joan, Sanz, Montserrat, Martínez Blanes, José María, and Avilés Escaño, Miguel Ángel

Abstract

A group of beads from the artificial cave of La Molina (Lora de Estepa, Sevilla) and Cova del Gegant (Sitges, Barcelona) were made from a biogenic raw material and intentionally covered by a layer of resin. This is the first time this type of treatment has been documented on elements of adornment in the Late Prehistory of the Iberian Peninsula. The composition and nature of the coatings are analysed and the symbolic role of such alterations and imitations of prehistoric adornments is discussed.

Published
2019

14. El hacha pulimentada de jade de la colección Tubino (Museo Municipal, Valencina de la Concepción, Sevilla)

Author

Odriozola Lloret, Carlos Patricio, Vargas Jiménez, Juan Manuel, Martínez Blanes, José María, García Sanjuán, Leonardo, Universidad de Sevilla. Departamento de Prehistoria y Arqueología, Universidad de Sevilla. Instituto de Ciencia de Materiales de Sevilla (ICMS) – CIC Cartuja, and Ministerio de Economía y Competitividad (MINECO). España

Subjects
Difracción de Rayos X, Espectroscopia μ-Raman, Jade, Prehistoria Reciente, Hacha Pulimentada, Intercambio de Larga Distancia
Abstract

A pished axe donated to the Valencina de la Concepción Museum (Seville, Spain) in November 2010, and that had belonged to Francisco María Tubino y Oliva's (1833-1888) personal clection, is studied. Although the exact provenance of this object is unknown, there are reasons to think that it might have been found on some archaẽogical site of the Seville province. Through the application of two different analytical techniques (XRD, DCμRS), this axe is identified as a jade-jadeite of purity above 95 ml%, which necessarily implies it came from the Alps. In the conclusions a discussion of this artifact is made in terms of long distance contact in Iberian Late Prehistory. En este trabajo se estudia un hacha pulimentada inédita excepcional depositada en el Museo de Valencina de la Concepción (Sevilla) en noviembre de 2010 y que formó parte de la colección personal de Francisco María Tubino y Oliva (1833-1888). Aunque la procedencia exacta de la pieza es desconocida, existen razones para pensar que podría proceder de algún yacimiento arqueológico de la provincia de Sevilla. Mediante la aplicación de dos técnicas analíticas diferentes (XRD, DCμRS), se identifica la pieza como jade-jadeíta de una pureza superior al 95 ml%, lo que implica su procedencia de los Alpes. En las conclusiones se realiza una valoración de la significación de esta pieza en términos de contactos a larga distancia en la Prehistoria Reciente ibérica. Ministerio de Economía y Competitividad HAR2013-34620

Published
2016

16. Amber, beads and social interaction in the Late Prehistory of the Iberian Peninsula: an update

Author

Odriozola, Carlos P., primary, Sousa, Ana C., additional, Mataloto, Rui, additional, Boaventura, Rui, additional, Andrade, Marco, additional, Villalobos García, Rodrigo, additional, Garrido-Cordero, José Ángel, additional, Rodríguez, Eugenio, additional, Martínez-Blanes, José María, additional, Avilés, Miguel Ángel, additional, Daura, Joan, additional, Sanz, Montserrat, additional, and Riquelme, José Antonio, additional

Published
2017
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17. Amber imitation? Two unusual cases of Pinus resin-coated beads in Iberian Late Prehistory (3rd and 2nd millennia BC).

Author

Odriozola, Carlos P., Garrido Cordero, José Ángel, Daura, Joan, Sanz, Montserrat, Martínez-Blanes, José María, and Avilés, Miguel Ángel

Subjects
ARCHAEOLOGY, PINE, EARTH sciences, MATERIALS science, PINACEAE
Abstract

A group of beads from the artificial cave of La Molina (Lora de Estepa, Sevilla) and Cova del Gegant (Sitges, Barcelona) were made from a biogenic raw material and intentionally covered by a layer of resin. This is the first time this type of treatment has been documented on elements of adornment in the Late Prehistory of the Iberian Peninsula. The composition and nature of the coatings are analysed and the symbolic role of such alterations and imitations of prehistoric adornments is discussed. [ABSTRACT FROM AUTHOR]

Published
2019
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18. El hacha pulimentada de jade de la colección Tubino (Museo Municipal, Valencina de la Concepción, Sevilla)

Author

Universidad de Sevilla. Departamento de Prehistoria y Arqueología, Universidad de Sevilla. Instituto de Ciencia de Materiales de Sevilla (ICMS) – CIC Cartuja, Ministerio de Economía y Competitividad (MINECO). España, Odriozola Lloret, Carlos Patricio, Vargas Jiménez, Juan Manuel, Martínez Blanes, José María, García Sanjuán, Leonardo, Universidad de Sevilla. Departamento de Prehistoria y Arqueología, Universidad de Sevilla. Instituto de Ciencia de Materiales de Sevilla (ICMS) – CIC Cartuja, Ministerio de Economía y Competitividad (MINECO). España, Odriozola Lloret, Carlos Patricio, Vargas Jiménez, Juan Manuel, Martínez Blanes, José María, and García Sanjuán, Leonardo

Abstract

A pished axe donated to the Valencina de la Concepción Museum (Seville, Spain) in November 2010, and that had belonged to Francisco María Tubino y Oliva's (1833-1888) personal clection, is studied. Although the exact provenance of this object is unknown, there are reasons to think that it might have been found on some archaẽogical site of the Seville province. Through the application of two different analytical techniques (XRD, DCμRS), this axe is identified as a jade-jadeite of purity above 95 ml%, which necessarily implies it came from the Alps. In the conclusions a discussion of this artifact is made in terms of long distance contact in Iberian Late Prehistory., En este trabajo se estudia un hacha pulimentada inédita excepcional depositada en el Museo de Valencina de la Concepción (Sevilla) en noviembre de 2010 y que formó parte de la colección personal de Francisco María Tubino y Oliva (1833-1888). Aunque la procedencia exacta de la pieza es desconocida, existen razones para pensar que podría proceder de algún yacimiento arqueológico de la provincia de Sevilla. Mediante la aplicación de dos técnicas analíticas diferentes (XRD, DCμRS), se identifica la pieza como jade-jadeíta de una pureza superior al 95 ml%, lo que implica su procedencia de los Alpes. En las conclusiones se realiza una valoración de la significación de esta pieza en términos de contactos a larga distancia en la Prehistoria Reciente ibérica.

Published
2016

20. El hacha de jadeíta de Portela do Outeiro (Sertã, Castelo Branco, Portugal)

Author

Universidad de Sevilla. Departamento de Prehistoria y Arqueología, Odriozola Lloret, Carlos Patricio, Villalobos García, Rodrigo, Boaventura, Rui, Sousa, Ana Catarina, Batata, Carlos, Martínez Blanes, José María, Universidad de Sevilla. Departamento de Prehistoria y Arqueología, Odriozola Lloret, Carlos Patricio, Villalobos García, Rodrigo, Boaventura, Rui, Sousa, Ana Catarina, Batata, Carlos, and Martínez Blanes, José María

Published
2015

22. EL HACHA PULIMENTADA DE JADE DE LA COLECCIÓN TUBINO (MUSEO MUNICIPAL, VALENCINA DE LA CONCEPCIÓN, SEVILLA).

Author

ODRIOZOLA, CARLOS P., VARGAS JIMÉNEZ, JUAN MANUEL, MARTÍNEZ-BLANES, JOSÉ MARÍA, and GARCÍA SANJUÁN, LEONARDO

Abstract

Copyright of Spal: Revista de Prehistoria y Arqueologia de la Universidad de Sevilla is the property of Spal. Revista de Prehistoria y Arqueologia de la Universidad de Sevilla and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2016
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23. Polychromy in Roman Portraits from Asido(Medina Sidonia, Cádiz, Spain). Livia, Germanicusand Drusus Minor

Author

Odriozola, Carlos P., Beltrán Fortes, José, Loza Azuaga, María Luisa, and Martínez Blanes, José María

Abstract

This paper presents a recent study on a Roman period marble sculpture depicting Empress Liviaand the portraits of Germanicusand Drusus Minor, found at the praesidiumof Asido(Medina Sidonia, Cádiz, Spain). The sculptures retain extensive evidence of their original polychromy. The properties and spatial distribution of these pigment remains were investigated by portable non-invasive and micro-destructive techniques, applying digital microscopy, and UV/VIS/NIR/SWIR spectroscopy, portable XRF and SEM–EDS analysis. The study revealed the presence of Egyptian blue and ochre on Livia’s mantle and charcoal black on Livia’s eyes and hair, remains that were not clearly visible to the naked eye. This is a significant approach, used to identify colours on ancient marble sculpture, which transforms our understanding of these unique pieces. Elemental composition analysis by pXRF has confirmed the evidence of pigments, furthermore supported by the Raman results, making it possible to develop and reconstruct the colour palette that originally brought these sculptures to life in vibrant polychrome. The research offers a new methodology for identifying pigments on marble sculpture and opens new ways for investigating other types of material culture aided by the development of the analytical equipment mentioned.

Published
2022
Full Text
View/download PDF

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