Results 51 to 60 of about 5,797 (153)

Changes in mesophotic carbonate‐platform export across the end of the last glacial cycle (Saya de Malha Bank, western Indian Ocean)

The Depositional Record
The export of neritic material from the top of carbonate platforms is a key process in the construction of their slopes. However, our knowledge of the supply pattern of materials from platforms is dominantly based on platforms lying in the euphotic zone ...
Or M. Bialik, Christian Betzler, Juan Carlos Braga, John J. G. Reijmer, Jesus Reolid, Sebastian Lindhorst   +5 more
doaj   +1 more source

CONCRETIONS WITH FOSSILS OF THE ULYANOVSK REGION - A NEW KIND OF JEWELRY-ORNAMENTAL RAW MATERIALS

Известия высших учебных заведений: Геология и разведка, 2018
Concretions with fossils of the Ulyanovsk region are a new kind of jewelry and ornamental raw materials. Concretions are located in the middle part of the section of the Hauterivian sediments, which formed by dark gray dense clays. Concretions are dense,
D. A. Petrochenkov
doaj   +1 more source

Microemulsion‐Based Drilling Fluids Incorporating Seashell Residue Powder: A Sustainable Approach to Fluid Loss Control

Journal of Surfactants and Detergents, EarlyView.
Two microemulsion‐based drilling fluids incorporating SSRP were formulated using pine oil, the nonionic surfactant Alkonat L100W, and a glycerol/water solution. The results provide valuable insights into how surfactant‐assisted microemulsion systems can be engineered to enhance the performance and eco‐efficiency of drilling fluids.
Luara Ribeiro Viana, Raphael Ribeiro da Silva, João Pedro Gonçalves de Souza Soares, José Cavalcante de Queiroz Neto, Maria Eduarda Araújo Pessoa, Rafael Peixoto Alves, Fabiola Dias da Silva Curbelo   +6 more
wiley   +1 more source

Trace element and stable isotope data from a flowstone in a natural cave of the mining district of SW Sardinia (Italy): evidence for Zn2+-induced aragonite precipitation in comparatively wet climatic conditions

International Journal of Speleology, 2011
A speleothem from Crovassa Azzurra, a mine cave in SW Sardinia (Italy), has been analysed for mineralogy, minor and traceelements and stable isotopes. It is composed of layers of primary calcite and aragonite, with a region of secondary calcite.
Caddeo Guglielmo Angelo, De Waele Jo, Frau Franco, Railsback L. Bruce   +3 more
doaj  

Electrochemical Monitoring of Steel Corrosion in NS4 Solution Under Cathodic Protection Environment: Insights of Electrochemical Impedance Spectroscopy

Materials and Corrosion, EarlyView.
Electrochemical impedance spectroscopy (EIS) monitored corrosion on mild steel under cathodic protection in soil‐like conditions. CP reduced corrosion from 410 to 7 µm/yr, shifting the mechanism from mixed activation–diffusion to activation‐controlled, enabling protective calcareous and oxide film formation.
Mandlenkosi George Robert Mahlobo, Tumelo Wordsworth Poloko Seadira, Major Melusi Mabuza, Peter Apata Olubambi   +3 more
wiley   +1 more source

Preparation of Aragonite Whiskers by Dolomite

MATEC Web of Conferences, 2017
Aragonite CaCO3 with complicated morphologies needle-like structrues have been successfully synthesized through dolomite as raw materials by the decomposition of urea.
Xu W.R, Chen J, Huang Z.L
doaj   +1 more source

Synthesis and Crystal Structure of Sb2O2[CO3] with Stereochemically Active Lone Electron Pairs at Elevated Pressures

Zeitschrift für anorganische und allgemeine Chemie, EarlyView.
Sb2O2[CO3] was synthesized at 20 GPa in a laser‐heated diamond cell and is an antimony oxocarbonate with stereochemically active lone electron pairs on the antimony atoms. Its crystal structure is characterized by the presence of [CO3]2–‐groups and by interconnected “Sb2O5‐units” which form a Sb–O‐network within the b,c lattice plane.
Dominik Spahr, Lkhamsuren Bayarjargal, Lukas Brüning, Elena Bykova, Maxim Bykov, Victor Milman, Nico Giordano, Björn Winkler   +7 more
wiley   +1 more source

Drivers of CO2-carbonate system variability in the coastal ocean south of Honolulu, Hawai’i

Frontiers in Marine Science
This study examines carbonate chemistry variability from 2008 to 2021 in subtropical coastal waters adjacent to Honolulu, Hawai’i. We use surface seawater carbon dioxide partial pressure (pCO2sw) measurements obtained every three hours from two buoys ...
Lucie A. C. M. Knor, Melissa Meléndez, Christopher L. Sabine, Adrienne J. Sutton   +3 more
doaj   +1 more source

Response of Remote Tropical West Pacific Islands to Climate Variability: A Multiproxy Record From T‐Lake, Palau, Spanning the Early Holocene to Present

Archaeometry, EarlyView.
ABSTRACT Lake sediments are natural archives of past environmental dynamics and how these systems have responded to past climate variability. Sediment geochemistry, governed by local geology and climate processes, is unique to each lake‐catchment and geochemical proxies must be validated for each study site.
Jalene Nalbant, Larissa Schneider, Jessica L. Blois, Matthew Wolhowe, Julian P. Sachs, Simon G. Haberle, Geoffrey Clark   +6 more
wiley   +1 more source

Resilience of Atlantic Slippersnail Crepidula fornicata Larvae in the Face of Severe Coastal Acidification

Frontiers in Marine Science, 2018
Globally, average oceanic pH is dropping, and it will continue to decline into the foreseeable future. This ocean acidification (OA) will exacerbate the natural fluctuations in pH that nearshore ecosystems currently experience daily, potentially pushing ...
Nicola G. Kriefall, Jan A. Pechenik, Anthony Pires, Sarah W. Davies   +3 more
doaj   +1 more source