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8 Research products, page 1 of 1

  • Publications
  • 2017-2021
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  • Publication . Part of book or chapter of book . 2018
    English
    Authors: 
    Huet Thomas;
    Publisher: HAL CCSD
    Country: France

    International audience; As with geography, ceramic decorations are essentially spatial organisations of features. Therefore, they should be analysed with spatial indexes. But spatial analyses, at the shard or the complete ceramic scale, are often difficult to set up, mostly because of the contiguity of graphical features.This paper presents a new method to record and analyse ceramic decoration. We use graph theory, with a GIS interface and Python programming, to analyse ceramic decoration in a bottom-up process. A priori definitions are minimal and only concern elementary units (morphological, graphical and plastic) which compose the ceramic.The studied corpus is composed of ceramic decorations belonging to the Mailhac I facies (Late Bronze Age), characterised by complex figurative compositions. Each decoration — complete or fragmented — is considered as a spatialized network (i.e. geometric graph). Graph theory provides tools to record and measure proximities between units and normalised indexes to compare different decorations, whatever their completeness. The GIS offers a graphic interface and ensures the correctness of spatial relationships between these units. The typology of these units is realised in a hierarchical oriented graph. This structure allows processes of generalisation (going up the tree) and specification (going down the tree), permitting comparison between units with different kinds of resolution and/or complexity. The method presented here can be used for other types of mediums(statuary, rock art, etc.).

  • Publication . Part of book or chapter of book . 2020
    English
    Authors: 
    Sellato, Bernard;
    Publisher: HAL CCSD
    Country: France

    International audience; Decoration has long suffered from relative neglect in material culture studies, now more focused on the social and cognitive processes behind the object. It has been regarded either as devoid of meaning, with motif names being simply labels, or as imbued with major socio-cultural and religious significance. This chapter, covering the field of basketry in Borneo, examines the underlying, potentially complex, relations between a motif or pattern, the way it is named, the meaning of this name, and what it denotes, both as an immediate representation and as a vector of metaphorical, symbolic, mythological, or religious referents. It stresses the need to view culture at the local level, as the current product of a given community's unique history of internal evolution and external cultural and social interaction, with high variability among communities. It concludes that a local catalogue of motifs is the result of an ongoing ad hoc collective bricolage, with possibly some kind of hierarchy among various classes of motifs, but in which norms, rules, and coherent naming and reference systems remain elusive.

  • English
    Authors: 
    Laura Louman; Carole FRITZ; Didier Desponds; Geneviève Pinçon;
    Publisher: HAL CCSD
    Country: France

    International audience; Geographic information systems (GIS) have been used to study the Chauvet-Pont d’Arc Cave (Vallon-Pont-d’Arc, Ardèche) for over ten years, with the support of the Ministry of Culture’s Centre National de Préhistoire (CNP). Their use has facilitated the centralisation and description of data and metadata. The arrival of Web 2.0 today opens up new prospects for data acquisition in situ and makes an interdisciplinary information management possible. The WebSIG application at the Chauvet Cave is proposed as an operational response to new uses. The introduction of Geoweb tools in archaeological practices invites us to adopt a reflective approach so as to highlight their usefulness in the study of decorated caves.; Depuis plus d’une dizaine d’années, les systèmes d’information géographique sont utilisés pour l’étude de la grotte Chauvet-Pont d’Arc (Vallon-Pont-d’Arc, Ardèche) avec l’appui du Centre National de Préhistoire (CNP) du ministère de la Culture. Leur emploi a facilité la centralisation et la description des données et des métadonnées. L’arrivée du web 2.0 ouvre aujourd’hui de nouvelles perspectives d’acquisition in situ et rend possible une gestion interdisciplinaire de l’information. L’application du WebSIG à la grotte Chauvet est proposée comme une réponse opérationnelle à de nouveaux usages. L’introduction des outils du géoweb dans les pratiques archéologiques invite à mener une approche réflexive afin de mettre en évidence leur intérêt pour l’étude des grottes ornées.

  • Open Access English
    Authors: 
    Christian Degrigny; Francesca Piqué;
    Publisher: HAL CCSD
    Country: France

    International audience; The aim of this study was to examine and document the wall paintings in theChâteau de Germolles. Situated in Burgundy, France, Germolles is the best preservedresidence of the Dukes of Burgundy and was listed as a monument ofnational importance in 1989.The medieval wall decoration of the Château de Germolles was rediscoveredunder the nineteenth-century plasters during World War II. Medieval accounts ofthe château provide a detailed list of the materials acquired to make the muraldecoration, but this list is incongruous when compared with the current appearanceof the paintings. The discrepancy between the archival and material evidence,and also the need to understand the complexity of the painting technique usedwere the main motivations for undertaking the case study described in this chapter.Imaging alongside more traditional examination techniques were utilized torecord and document the mural decoration. The objectives of the case study wereto distinguish the original materials from those applied during restoration, identifythose materials, and correlate them with the archives. We also tried to understandthe medieval painting techniques used and assess the condition of the paintingsand stabilization requirements. Finally we aimed to find a sustainable solution forthe management of the various types of data collected. Various techniques andinvestigations offered valuable insights into the materials and the painting techniqueused. To improve visitor experience, based on the information gained in thecourse of this study, a 3D virtual representation of the original decoration is currentlyproposed for display to the public visiting the Château de Germolles.

  • Open Access English
    Authors: 
    C.I. da Silva Oliveira; Diego Martinez-Martinez; Luís Miguel Cunha; Marcos Rodrigues; Joel Nuno Pinto Borges; C. Lopes; Eduardo Alves; N.P. Barradas; M. Apreutesei;
    Publisher: HAL CCSD
    Countries: France, Portugal, France

    The deposition of decorative coatings is an excellent solution to modify the surface of any material, particularly the aesthetic finishing, without altering the properties of the substrate. Transition metal oxynitride films are interesting for many applications, due the simple and economic way to tune between nitride and oxide bonding. In reactive sputtering, this is done by playing with the flows of N2 and O2, leading to variations of properties (e.g. color) in different directions. In this paper, zirconium is selected as transition metal due to combination of different characteristics (color, biocompatibility, mechanical properties, corrosion resistance). The literature about Zr-O-N films reveals a confinement of chemical composition. Therefore, the aim of this work is the exploration of the deposition parameter space in order to evaluate the stability of the Zr-O-N system, i.e. verify if the chemical composition of the films still falls in the same range after variation of different deposition parameters. To do that, a series of Zr-O-N films is deposited first at different reactive flows, maintaining the remaining deposition parameters constant. The obtained films can be classified in three different groups, based on their chemical composition, crystalline structure, and film growth. These groups can be successfully explained according to the sputtering characteristics, and correlated with the mechanical properties and color of the films measured by nanoindentation and spectrophotometry receptivity. The films deposited by variation of other parameters are introduced afterwards and their characteristics are compared with the reference series. The financial support of Portuguese Foundation of Science and Technology (FCT), under the project number IF/00671/2013 is gratefully acknowledged. info:eu-repo/semantics/acceptedVersion "Available online 21 November 2017"

  • Open Access English
    Authors: 
    Samara Danel; Timothée Zidat; Annick Lucas; Dora Biro; Francesco Bonadonna;
    Publisher: HAL CCSD
    Countries: France, United Kingdom, France

    International audience; A wide range of animal species accumulate objects in, on, and/or around structures they build. Sometimes, these accumulations serve specific functions (e.g. structural or isolating features) or are purely incidental, while in other cases the materials are deliberately displayed to serve signalling purposes (extended phenotype signals). In this pilot study, we employed systematic in situ observations and camera trapping to describe for the first time that both partners of a territorial shorebird, the black-faced sheathbill (Chionis minor ssp minor) collect, carry, and arrange colourful marine shells and dry twigs within and around their nest cavity. Our observations expand the taxonomic breadth of avian extended phenotype signals, by showing that at least one species within a largely understudied group i.e., Charadriiformes, exhibits nest-decoration behaviour. Multiple manipulative experiments are needed to explore further the signalling function of these decorations, which opens new exciting avenues for animal communication and cognition research.

  • Open Access English
    Authors: 
    Azam Salmankhani; Zohre Karami; Amin Hamed Mashhadzadeh; Mohammad Reza Ganjali; Vahid Vatanpour; Amin Esmaeili; Sajjad Habibzadeh; Mohammad Reza Saeb; Vanessa Fierro; Alain Celzard;
    Publisher: HAL CCSD
    Country: France

    The efficient removal of pollutants from different environments has been one of the great challenges for scientists in recent years. However, the understanding of the mechanisms underlying this phenomenon is still the subject of passionate debates, mainly due to the lack of experimental tools capable of detecting events at the atomic scale. Herein, a comparative theoretical study was carried out to capture the adsorption of H2S on metal oxide surfaces such as zinc oxide (ZnO) and beryllium oxide (BeO), as well as graphene and Ni-decorated graphene. A simulation based on density-functional theory (DFT) was carried out by adopting General Gradient Approximation (GGA) under the Perdew&ndash 1.64 eV due to the interaction of S and Ni atoms through the formation of a covalent bond, proof of chemisorption. It seems that the graphene sheet decorated with Ni atoms is a more suitable adsorbent for H2S molecules than BeO, ZnO, or non-decorated graphene, providing a theoretical basis for future studies. Ernzerhof (PBE) function. The calculations quantified H2S adsorption on the considered metal oxide sheets as well as on the non-decorated graphene having a physical nature. In contrast, H2S adsorbed on Ni-decorated graphene sheet gave an adsorption energy of &minus Burke&ndash

  • Open Access English
    Authors: 
    Dang Mao Nguyen; Thi Hong Nhung Vu; Thi Mai Loan Nguyen; Trinh Duy Nguyen; Chi Nhan Ha Thuc; Quoc-Bao Bui; Julien Colin; Patrick Perré;
    Publisher: MDPI AG
    Country: France

    This study aims to produce novel composite artificial marble materials by bulk molding compound processes, and improve their thermal and mechanical properties. We employed stearic acid as an efficient surface modifying agent for CaCO3 particles, and for the first time, a pretreated, recycled, polyethylene terephthalate (PET) fibers mat is used to reinforce the artificial marble materials. The innovative aspects of the study are the surface treatment of CaCO3 particles by stearic acid. Stearic acid forms a monolayer shell, coating the CaCO3 particles, which enhances the compatibility between the CaCO3 particles and the matrix of the composite. The morphology of the composites, observed by scanning electron microscopy, revealed that the CaCO3 phase was homogeneously dispersed in the epoxy matrix under the support of stearic acid. A single layer of a recycled PET fibers mat was pretreated and designed in the core of the composite. As expected, these results indicated that the fibers could enhance flexural properties, and impact strength along with thermal stability for the composites. This combination of a pretreated, recycled, PET fibers mat and epoxy/CaCO3-stearic acid could produce novel artificial marble materials for construction applications able to meet environmental requirements.

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