Aragonite Fraction Dating of Vermetids in the Context of Paleo Sea-Level Curves Reconstruction

Autor: Renato B. Guimarães, Katerina Douka, Perla Baptista de Jesus, Kita Macario, Fábio Ferreira Dias, Vinicius N. Moreira, Julia Caon Araujo

Publikováno v: Radiocarbon. 62:335-348

Identifying and tackling recrystallization is a critical factor in the reliable radiocarbon (14C) dating of carbonates, since exogenous carbon can be incorporated and thus mask the real age of the samples. Vermetids are among the most important bioin

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::56f0f3b1774919fae33edf862b78d803
https://doi.org/10.1017/rdc.2020.7

Assessment of Graphitized Coal Ash Char Concentrates as a Potential Synthetic Graphite Source

Autor: Georgeta Predeanu, Renato B. Guimarães, Bruno Valentim, Ignacio Cameán, Isabel Suárez-Ruiz, Nicola J. Wagner, Cláudia A. Teixeira dos Santos, Mihai Cruceru, Karen Moreira, Alexandra Guedes, Barbara Białecka, Charlotte Badenhorst, Juan Manuel Lázaro-Martínez

Publikováno v: Minerals
Volume 10
Issue 11
Digital.CSIC. Repositorio Institucional del CSIC
instname
CONICET Digital (CONICET)
Consejo Nacional de Investigaciones Científicas y Técnicas
instacron:CONICET

Coal ash char concentrates from four countries (Portugal, Poland, Romania, and South Africa) were prepared, characterised, and graphitized under the scope of the Charphite project (Third ERA-MIN Joint Call (2015) on the Sustainable Supply of Raw Mate

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2852807020cf5025f5fdb620415170f7

Stromatolite Growth in Lagoa Vermelha, Southeastern Coast of Brazil: Evidence of Environmental Changes

Autor: Carolina N. Keim, Maria Isabela N. Oliveira, Mirian Araújo Carlos Crapez, Elisamara Sabadini-Santos, Renato B. Guimarães, Kita Macario, Carla Roberta de Oliveira Carvalho

Publikováno v: Radiocarbon. 60:383-393

Among the oldest remains of living beings to have inhabited the Earth’s surface, there are the stromatolites—laminated sedimentary rocks associated with lithified mats of layered phototrophic microbial communities—which grow in specific environ

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::889aead0ccd7c2fad04cb778ace17bdd
https://doi.org/10.1017/rdc.2017.126

Managing optical heating via Al

Autor: Nikifor, Rakov, Renato B, Guimarães, Glauco S, Maciel

Publikováno v: Dalton transactions (Cambridge, England : 2003). 48(14)

Quenching of photoluminescence due to optical heating generated by high power laser sources has been identified as a major concern for photonics applications that relies on inorganic phosphor materials. Here we investigate how erbium-doped strontium

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=pmid________::cd8f9faf63e6ba03b23ed0030095a1cf
https://pubmed.ncbi.nlm.nih.gov/30882840

Photon up-conversion production in Tb3+–Yb3+ co-doped CaF2 phosphors prepared by combustion synthesis

Autor: Nikifor Rakov, Renato B. Guimarães, Glauco S. Maciel

Publikováno v: Materials Research Bulletin. 74:103-108

Calcium fluoride (CaF 2 ) crystalline powders were successfully prepared by the combustion synthesis method. The powder material containing luminescent rare-earth ions, more specifically terbium (Tb 3+ ) and ytterbium (Yb 3+ ), was studied by X-ray d

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9f30034c47790f022306f1215ba6711d
https://doi.org/10.1016/j.materresbull.2015.10.023