Results 61 to 70 of about 17,623 (218)

Local Structures of Se and Br in Cretaceous–Paleogene Boundary Sediments and Concentration Effects of Ferrihydrite Originating From Impact Ejecta

Geological Journal, EarlyView.
Chemical states of Se and Br atoms in the KPg boundary sediments from Stevns Klint were studied using XAFS spectroscopy. The high concentrations of Se4+ could become an index of the degree to which the global environment was soiled with dust and ash derived from impact ejecta or volcanic eruptions.
Kei‐ichiro Murai, Akira Yoshiasa, Ginga Kitahara, Makoto Tokuda, Satoko Ishimaru, Toshihiro Moriga   +5 more
wiley   +1 more source

Thermal treatment of natural goethite : thermal transformation and physical properties [PDF]

, 2013
XRD (X-ray diffraction), XRF (X-ray fluorescence), TG (thermogravimetry), FT-IES (Fourier transform infrared emission spectroscopy), FESEM (field emission scanning electron microscope), TEM (transmission electron microscope) and nitrogen–adsorption ...
Liu, Haibo, Zou, Xuehua, Chen, Tianhu, Qing, Chengsong, Frost, Ray L.   +4 more
core   +1 more source

Mineralogical and Geochemical Constraints of the REE Accumulation in the Almásfüzitő Red Mud Depository in Northwest Hungary

Applied Sciences, 2019
Detailed mineralogical and geochemical study of red mud samples from Hungary suggests geological and geochemical processes that determine the spatial distribution of certain elements inside the red mud pitfalls. The major processes are the following: (1)
Tivadar M. Tóth, Félix Schubert, Béla Raucsik, Krisztián Fintor   +3 more
doaj   +1 more source

Dihydroxyacetone valorization with high atom efficiency via controlling radical oxidation pathways over natural mineral-inspired catalyst

Nature Communications, 2021
Radicals-mediated Fenton chemistry has the potential for biomass valorization. Here, inspired from the natural goethite mineral, the authors develop a MnO2/goethite catalyst showing excellent yields of glycolic acid and formic acid from dihydroxyacetone,
Jinling Wang, Xingchao Dai, Hualin Wang, Honglai Liu, Jabor Rabeah, Angelika Brückner, Feng Shi, Ming Gong, Xuejing Yang   +8 more
doaj   +1 more source

Corrosion Performance of Steel and Zinc‐Based Materials in Diverse Unsaturated Soils: Insights From a 2‐Year Field Exposure

Materials and Corrosion, EarlyView.
The present study generated the corrosion performance of C‐steel, zinc, and galvanized steel in different global unsaturated soil environments for 2 years. Acceptable matching was observed between corrosion rates and identified corrosion products. To properly predict soil corrosion, the results showed that DIN 50929 should include a drainage‐capability
Abdelkader Meroufel, Dominique Thierry, Alexander Saul, Hanan Farhat, Brahim Aissa   +4 more
wiley   +1 more source

Long‐Term Corrosion of Carbon‐Steel Casing Used in Deep Geological Radioactive Waste Repository

Materials and Corrosion, EarlyView.
Fifty mots 6‐year study of carbon steel corrosion in a deep geological repository (Bure, France). Three corrosion patterns were identified, driven by local conditions. Minimal corrosion layer thickness growth suggests limited corrosion progression under most conditions.
Mahado Saïd Ahmed, Delphine Neff, Annabelle Vernouillet, Xavier Bourbon, Didier Crusset, Gaëlle Charrier, Valérie Maillot, Philippe Dillmann   +7 more
wiley   +1 more source

Mechanistic Study of Radium Adsorption onto Goethite

, 2020
Radium (Ra2+) is a radioactive element with a long half-life. It is used in industry and is often found in shallow aquifers due to natural or anthropogenic leakage or spill of brine from deep subsurface.
Meng X., Shi Q., Prigiobbe V.
core   +1 more source

The emergence and complexification of symbolic practices in the Homo lineage: an archaeological and cognitive perspective Émergence et complexification des pratiques symboliques dans la lignée Homo : une approche archéologique et cognitive

Journal of the Royal Anthropological Institute, EarlyView.
Recent archaeological discoveries, reviewed in this essay, challenge traditional views on the emergence of human symbolic cognition. Once believed to have originated in Europe around 40,000 years ago, new evidence shows it emerged much earlier across diverse regions.
Francesco d'Errico, Ivan Colagè, Larissa M. Straffon, Andrea Bender   +3 more
wiley   +1 more source

Goethite Hinders Azo Dye Bioreduction by Blocking Terminal Reductive Sites on the Outer Membrane of Shewanella decolorationis S12

Frontiers in Microbiology, 2019
Iron (hydr)oxides are the most ubiquitous Fe(III)-containing minerals in the near-surface environments and can regulate organic pollutant biotransformation by participating in bacterial extracellular electron transfer under anaerobic conditions ...
Gang Zhao, Gang Zhao, Enze Li, Enze Li, Jianjun Li, Jianjun Li, Feifei Liu, Feifei Liu, Fei Liu, Fei Liu, Meiying Xu, Meiying Xu   +11 more
doaj   +1 more source

The Materiality of the Cloggs Cave Rockshelter's Painting, GunaiKurnai Country (East Gipplsland), Southeastern Australia

Archaeometry, EarlyView.
ABSTRACT The materiality of the white pigment motif at the Cloggs Cave rockshelter, near Buchan in GunaiKurnai Country (southeastern Australia), contains details about the cultural and environmental contexts in which the art was created and preserved. Here, we (1) present physicochemical analyses of the pigment composition; (2) explore implications for
Courtney Webster, Jillian Huntley, Russell Mullett, Bruno David, Joanna Fresløv, Helen E. A. Brand, Jean‐Jacques Delannoy, Robert G. Gunn, GunaiKurnai Land and Waters Aboriginal Corporation   +8 more
wiley   +1 more source