Results 11 to 20 of about 189,696 (282)

Late Pleistocene to Middle Holocene record of sedimentation and carbonate content in the Zervynos paleolake-dune complex, Lithuania [PDF]

open access: yesEstonian Journal of Earth Sciences, 2022
The Late Pleistocene to the Holocene is a time interval that covers the climate transition from a cold to a warm interglacial regime. In the Baltic region, many studies have focused on estimating environmental responses to climatic forcing using ...
Liudas Daumantas   +5 more
doaj   +3 more sources

Measurements and Modelling of Vapour–Liquid Equilibrium for (H2O + N2) and (CO2 + H2O + N2) Systems at Temperatures between 323 and 473 K and Pressures up to 20 MPa

open access: yesEnergies, 2022
Understanding the phase behaviour of (CO2 + water + permanent gas) systems is critical for implementing carbon capture and storage (CCS) processes, a key technology in reducing CO2 emissions.
Yolanda Sanchez-Vicente   +1 more
doaj   +1 more source

Carbon nanofibers based carbon–carbon composite fibers

open access: yesDiscover Nano, 2023
AbstractTextile grade polyacrylonitrile (PAN) was used as a precursor material for carbon fiber preparation. E-beam irradiated polyacrylonitrile grafted carbon nanofibers were dispersed in polyacrylonitrile solution (dissolved in dimethyl formamide).
Nitilaksha Hiremath   +6 more
openaire   +3 more sources

A Combined Model for Kinetic Clumped Isotope Effects in the CaCO3‐DIC‐H2O System

open access: yesGeochemistry, Geophysics, Geosystems, 2022
Most Earth surface carbonates precipitate out of isotopic equilibrium with their host solution, complicating the use of stable isotopes in paleoenvironment reconstructions. Disequilibrium can arise from exchange reactions in the DIC‐H2O system as well as
James M. Watkins, Laurent S. Devriendt
doaj   +1 more source

Optical and Spectroscopic Properties of Lorenzenite, Loparite, Perovskite, Titanite, Apatite, Carbonates from the Khibiny, Lovozero, Kovdor, and Afrikanda Alkaline Intrusion of Kola Peninsula (NE Fennoscandia)

open access: yesCrystals, 2022
This manuscript deals with the analysis of significant rare earth elements (REE) minerals such as eudialyte, lorenzenite, loparite, perovskite, titanite, apatite, and carbonates.
Miłosz Huber   +3 more
doaj   +1 more source

A New Look at Physico-Chemical Causes of Changing Climate: Is the Seasonal Variation in Seawater Temperature a Significant Factor in Establishing the Partial Pressure of Carbon Dioxide in the Earth’s Atmosphere?

open access: yesThermo, 2022
Seasonal oscillations in the partial pressure of carbon dioxide (pCO2) in the Earth’s atmosphere, stronger in northern latitudes, are assumed to show that terrestrial photosynthesis exceeds respiration in summer, reducing the pCO2 in air but increasing ...
Ivan R. Kennedy   +3 more
doaj   +1 more source

Prestack Seismic Velocity Ratio Evaluation of a Mixed Siliciclastic–Carbonate Formation: Case Study from the Strawn Group on the Eastern Shelf Texas

open access: yesEnergies, 2023
Although a mixed carbonate–siliciclastic system of the Strawn Group on the Eastern Shelf in King County, Texas, USA provides excellent hydrocarbon reservoirs, facies variability and reservoir properties within such systems are not well understood.
Osareni C. Ogiesoba   +3 more
doaj   +1 more source

Hydrothermal Calcite Precipitation in Veins: Inspired by Experiments for Oxygen Isotope Fractionation between CO2 and Calcite from 1 °C to 150 °C

open access: yesApplied Sciences, 2023
The oxygen isotope ratios of minerals are important for estimating the formation temperature of hydrothermal deposits. Calcite is generally found in most mining districts.
Yuichi Morishita
doaj   +1 more source

Tetrahedrally coordinated carbonates in Earth's lower mantle [PDF]

open access: yes, 2015
Carbonates are the main species that bring carbon deep into our planet through subduction. They are an important rock-forming mineral group, fundamentally distinct from silicates in Earth's crust in that carbon binds to three oxygen atoms, while silicon ...
Boulard, Eglantine   +4 more
core   +3 more sources

Enhancing Computational Precision for Lattice Boltzmann Schemes in Porous Media Flows

open access: yesComputation, 2016
We reassess a method for increasing the computational accuracy of lattice Boltzmann schemes by a simple transformation of the distribution function originally proposed by Skordos which was found to give a marginal increase in accuracy in the original ...
Farrel Gray, Edo Boek
doaj   +1 more source

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