73 documents found, page 1 of 8
Laboratory experiments and modelling of the geochemical interaction of a gabbro...
Berrezueta, Edgar; Moita, Patricia; Pedro, Jorge; Abdoulghafour, Halidi; Mirão, José; Beltrame, Massimo; Barrulas, Pedro; Araújo, AlexandreThe potential for mineral carbonation of carbon dioxide (CO2) in a plutonic mafic rock is addressed in this work through a set of laboratory experiments on a gabbro-anorthosite sample from the Torrão - Odivelas Massif (Portugal). The experiment was conducted in two stages under pressure (8 MPa) and temperature (313.15 K) conditions similar to those expected around a CO2 injection well. Stage-I simulated dissolu...
Try It Before You Buy It: A Non-Invasive Authenticity Assessment of a Purported...
Loncaric, Valentina; Barrulas, Pedro; González Bornay, José Miguel; Costa, MafaldaMuseums may acquire archaeological artefacts discovered by non-specialists or amateur archaeologists, holding the potential to promote the safeguarding of cultural heritage by integrating the local community in their activities. However, this also creates an opportunity for the fraudulent sale of modern forgeries presented as archaeological artefacts, resulting in the need for a critical assessment of the artef...
Caracterização geoquímica da diagénese em dentes de saurópodes como suporte aos...
da Silva, Roberto; Camilo da Silva, Bruno; Cáceres Balbino, Ausenda; Barrulas, Pedro; Barrocas Dias Teixeira da Costa, Mafalda; Ribeiro, CarlosRESUMO: Foram realizados estudos mineralógicos e geoquímicos detalhados (μ-XRD, μ-XRF, SEM-EDS, LA-ICP-MS), em dentes de saurópodes do Jurássico Superior do sector central da Bacia Lusitaniana. Destes, a μ-XRD revelou uma constituição mineralógica consistente das amostras (hidroxiapatite) e a μ-XRF comprovou que a composição química dos dentes estudados é dominada pelo Ca e P, com pequenas concentrações de Fe, ...
Biosynthesis of silver-based nanoparticles: Critical assessment of antimicrobia...
Carrapiço, António; Pico, Manuel; Carreiro, Elisabete P.; Barrulas, Pedro; Mirão, José; Caldeira, Ana Teresa; Teixeira, Jorge; Dias, LuísSynthesis and application of nanoparticles (NPs) have shown promising results in various scientific fields due to their differentiating properties. However, current nanoparticle synthesis methods present environmental challenges. In this study biosynthesized silver nanoparticles (AgNPs) were produced from microbial culture supernatants as an alternative to traditional routes for controlling biodeteriogenic micr...
An Archaeometric Analysis of Black-Appearing Iron Age Glass Beads from Vinha da...
Lončarić, Valentina; Arruda, Ana Margarida; Barrulas, Pedro; Costa, MafaldaPhoenician colonisation of the Iberian Peninsula in the 1st millennium BCE introduced many novel and luxurious goods to the local populations of the Western Mediterranean. Among them, black-appearing glass beads are characteristic of indigenous female burials in Southern Portugal during the 6th century BCE. This study presents the results of the first comprehensive archaeometric investigation of black-appearing...
Chemical Composition of Hydrophobic Coating Solutions and Its Impact on Carbona...
Armal, Forough; Dias, Luis; Mirão, José; Pires, Vera; Sitzia, Fabio; Martins, Sérgio; Costa, Mafalda; Barrulas, PedroThe decay diagnosis and conservation of stone-built heritage is becoming a worldwide concern, especially when stone decay causes chromatic changes in the original stone aesthetics, which directly impacts its sociocultural value. Among all the causes of stone decay, water action is identified as the major cause of stone decay and chromatic changes in stone building materials; hence, protective eco-friendly hydro...
CONHECER E PREVER NA P EDRA NATURAL | C ARACTERIZAÇÃO AVANÇADA DE MATERIAIS PÉT...
Pires, Vera; Sitzia, Fabio; Lisci, Carla; Mirão, José; Dias, Luis; Barrulas, PedroA seleção de pedra natural como material de construção é, na grande maioria das situações, baseada nas suas características únicas, nos seus elevados padrões de beleza ornamental distintos, na pluralidade de tons e acabamentos e de resistência mecânica e durabilidade elevadas que esta tipologia de materiais apresenta. As características naturais, tão próprias desta matéria-prima, fascinam a maioria daqueles que...
Optimization of the Application of Commercial Hydrophobic Coatings for Natural ...
Hashim, Hurraira; Dias, Luís; Martins, Sérgio; Pires, Vera; Costa, Mafalda; Barrulas, PedroNatural stone has been used worldwide in the construction of archaeological and historical heritage. However, its preservation continues to be threatened by weathering and degradation phenomena. Water is widely recognized as the most threatening external component that contributes to stone deterioration, increasing the need for the development of protective hydrophobic coatings to eliminate water penetration. T...
Personal adornments in West-Central Africa—the case study of a talc bead from t...
Costa, Mafalda; Barrulas, Pedro; Lopes, Maria da Conceição; Barreira, João; de Jesus, Maria da Piedade; da Silva Domingos, Sónia; Vandenabeele, PeterA mustard-gold-colored talc bead was recovered during the 2014 excavation campaign carried out in Lumbu (Mbanza Kongo, Angola) together with the nineteenth-century glass trade beads imported from Bohemia and Venice. Results from this multianalytical and minimally invasive study suggest that this bead may have been brought to the kingdom’s capital by means of an established intra-kingdom trade network or as an o...
Personal adornments in West‑Central Africa—the case study of a talc bead from t...
Costa, Mafalda; Barrulas, Pedro; Lopes, Maria da Conceição; Barreira, João; de Jesus, Maria da Piedade; da Silva Domingos, Sónia; Vandenabeele, PeterA mustard-gold-colored talc bead was recovered during the 2014 excavation campaign carried out in Lumbu (Mbanza Kongo, Angola) together with the nineteenth-century glass trade beads imported from Bohemia and Venice. Results from this multianalytical and minimally invasive study suggest that this bead may have been brought to the kingdom’s capital by means of an established intra-kingdom trade network or as an o...