Browsing by Author "Alves, Carlos"

Advances in Materials Science and Engineering Assessment of Gamma Radiation Hazards Related to Geologic Materials: Comparison of Results by Field Gamma Spectrometry and Laboratory Methods

Sanjurjo-Sánchez, Jorge; Couto, Miguel; Alves, Carlos (Wiley, 2018)

[Abstract] Geologic materials are a potential source of external gamma radiation in buildings due to the presence of radioisotopes (40K and isotopes from U and Th decay families). The contents of these radioisotopes can ...

Assessment by portable gamma spectrometry of external gamma radiation hazard due to granitic materials and indoor space typology

Lima, Marco; Sanjurjo-Sánchez, Jorge; Alves, Carlos (Multidisciplinary Dixital Publishing Institute, 2017-12-14)

[Abstract] Building materials can contribute to ionizing radiation hazards due to their variable content in radioactive isotopes. Uranium, thorium, and potassium radioisotopes are present in various building materials due ...

Biomineral deposits and coatings on stone monuments as biodeterioration fingerprints

Sanjurjo-Sánchez, Jorge; Alves, Carlos; Freire, David M. (Elsevier, 2024)

[Abstract] Biominerals deposition processes, also called biomineralisation, are intimately related to biodeterioration on stone surfaces. They include complex processes not always completely well understood. The study of ...

Comparative Study of Deterioration in Built Heritage in a Coastal Area: Barbanza Peninsula (Galicia, NW Spain)

Sanjurjo-Sánchez, Jorge; Alves, Carlos; Figueiredo, Carlos Alberto Machado; Hernández, Ana C. (MDPI, 2023)

[Abstract] The Barbanza Peninsula (Galicia, NW Spain) is located on the west coast of Galicia. It is a narrow tongue of terrain with an area of 416 km2 and a high altitudinal gradient, with the top having a maximum height ...

Effects of Water on Natural Stone in the Built Environment—A Review

Alves, Carlos; Figueiredo, Carlos Alberto Machado; Sanjurjo-Sánchez, Jorge; Hernández Santomé, Ana Cristina (MDPI, 2021-11-07)

[Abstract] The present work reviews studies with information on the effects of water by itself on stones of the built environment both to assess the impact of this substance and to discuss possible implications for ...

Electronic Systems and Offsite Touristic Activities Based on Geological Concepts: A Speculative Discussion

Alves, Carlos; Figueiredo, Carlos Alberto Machado; Sanjurjo-Sánchez, Jorge (MDPI, 2020-10-30)

[Abstract] The COVID-19 pandemic has caused havoc in many economic areas such as those related to tourism. This creates the need for alternative activities in this sector, especially given that it is not clear when the ...

Ensino de Geología Ambiental no ambiente urbano

Alves, Carlos (2018)

[Abstract] Financial restrictions on higher education have affected diverse study areas and their effects can be considered particularly negative for those subjects that require fieldwork, as is the case of Geology. Under ...

Geological Materials as Cultural Markers of Water Resources

Alves, Carlos; Figueiredo, Carlos Alberto Machado; Sanjurjo-Sánchez, Jorge; Hernández Santomé, Ana Cristina (MDPI, 2020-12-01)

[Abstract] Water has always been a critical resource for humans and climate change could aggravate supply problems. In this context, groundwater could be an important reservoir of water, especially given the dispersion of ...

Geoscience of the Built Environment: Pollutants and Materials Surfaces

Alves, Carlos; Sanjurjo-Sánchez, Jorge (Molecular Diversity Preservation International, 2011)

An overview of issues with environmental relevance that arise from the interaction between pollutants and surfaces of the built environment is presented in this paper. Two broad perspectives are considered: decay of materials ...

Non-destructive studies of prehistoric lithic material culture in the search for sources of geologic raw materials: an overview of techniques and issues

Xavier, P.; Alves, Carlos (Universidade da Coruña, Servizo de Publicacións, 2019)

[Abstract] Geological raw materials are an important component of the archaeological record in the Prehistory (namely due to their persistence under buried conditions) and pinpointing their original position on the ...

Remote operations could be the future for Earth Sciences teaching: a speculative discussion

Alves, Carlos; Figueiredo, Carlos Alberto Machado; Sanjurjo-Sánchez, Jorge (MDPI, 2020-12-01)

[Abstract] The current COVID-19 pandemic has created havoc in the regular workings of many institutions, such as those dedicated to teaching; therefore, there is an urge for alternatives to traditional face-to-face teaching. ...

Rock Features and Alteration of Stone Materials Used for the Built Environment: A Review of Recent Publications on Ageing Tests

Alves, Carlos; Figueiredo, Carlos Alberto Machado; Sanjurjo-Sánchez, Jorge (MDPI AG, 2020-02-28)

[Abstract] This work presents a review of recent publications, with publication date between 2017 and 2019, with information on the relation between rock characteristics and the effects of diverse agents associated with ...

Salt Weathering of Natural Stone: A Review of Comparative Laboratory Studies

Alves, Carlos; Figueiredo, Carlos Alberto Machado; Sanjurjo-Sánchez, Jorge; Hernández Santomé, Ana Cristina (MDPI, 2021-08-03)

[Abstract] Natural stone is an important component of historical heritage (buildings and art objects such as sculptures or rock engravings), and it is still widely used in contemporary works. Soluble salts are the main ...

Study of the Geochemical Decay and Environmental Causes of Granite Stone Surfaces in the Built Heritage of Barbanza Peninsula (Galicia, NW Spain)

Sanjurjo-Sánchez, Jorge; Hernández, Ana C.; Alves, Carlos; Figueiredo, Carlos Alberto Machado (MDPI, 2024)

[Abstract] In Galicia (NW Spain), granite was the most used stone material in historical buildings. Despite the good properties of granite as a construction material, it overcomes several physical and chemical weathering ...