Results 31 to 40 of about 55,254 (299)

Was the Late Paleocene-Early Eocene Hot Because Earth Was Flat? An Ocean Lithium Isotope View of Mountain Building, Continental Weathering, Carbon Dioxide, and Earth's Cenozoic Climate [PDF]

open access: yesOceanography, 2014
Hothouse climates in Earth's geologic past, such as the Eocene epoch, are thought to have been caused by the release of large amounts of carbon dioxide and/or methane, which had been stored as carbon in biogenic gases and organic matter in sediments, to ...
Flip Froelich, Sambuddha Misra
doaj   +1 more source

Influence of accelerated ageing on the physico-mechanical properties of alkali-treated industrial hemp fibre reinforced poly(lactic acid) (PLA) composites [PDF]

open access: yes, 2010
30 wt% aligned untreated long hemp fibre/PLA (AUL) and aligned alkali treated long hemp fibre/PLA (AAL) composites were produced by film stacking and subjected to accelerated ageing. Accelerated ageing was carried out using UV irradiation and water spray
Foreman, Nic J.   +2 more
core   +2 more sources

Worldwide distribution of continental rock lithology: Implications for the atmospheric/soil CO2 uptake by continental weathering and alkalinity river transport to the oceans [PDF]

open access: yes, 2003
The silicate rock weathering followed by the formation of carbonate rocks in the ocean, transfers CO2 from the atmosphere to the lithosphere. This CO2 uptake plays a major role in the regulation of atmospheric CO2 concentrations at the geologic ...
Amiotte Suchet, Philippe   +2 more
core   +2 more sources

Influence of temperature, UV-light wavelength and intensity on polypropylene photothermal oxidation [PDF]

open access: yes, 2014
A criterion based on the energy absorbed by photosensitive species was proposed to describe the contribution of UV-light to the initiation of the polypropylene photothermal oxidation whatever the light source. The calculation of this energy was performed
COLIN, Xavier   +3 more
core   +4 more sources

Silicate rock weathering and atmospheric/soil CO2 uptake in the Amazon basin estimated from river water geochemistry: seasonal and spatial variations [PDF]

open access: yes, 2003
Using the data of the CAMREX project (1982–1984) on the water geochemistry of the Amazon river and its main tributaries, it was possible to assess the silicate rock weathering processes and the associated consumption of atmospheric/soil CO2, taking into
Mortatti, Jefferson, Probst, Jean-Luc
core   +2 more sources

Mineralogy and chemical composition of Cryosols and Andosols in Antarctica

open access: yesSoil and Water Research, 2018
Variations in mineralogical and elemental composition of Turbic Cryosol (King George Island and James Ross Island), Skeletic Cryosol (J. Ross Island, the Trinity Peninsula), Leptic Andosols (Deception Island), and Skeletic Andosols (Deception Island ...
Vítězslav VLČEK   +2 more
doaj   +1 more source

Geochemical signatures of potassium metasomatism in anthracite from the Himalayan fold-thrust belts of Sikkim, India

open access: yesInternational Journal of Coal Science & Technology, 2022
The present study focuses on the inorganic geochemical features of the bituminous coal samples from the Raniganj and the Jharia Basins, as well as the anthracite samples from the Himalayan fold-thrust belts of Sikkim, India.
Santanu Ghosh   +2 more
doaj   +1 more source

Variations of physico-mechanical, mineralogical and geochemical properties of marble under the influence of weathering [PDF]

open access: yes, 2019
Purpose. To investigate the physico-mechanical, mineralogical and geochemical properties variations of Igbeti marble, south-western Nigeria under the influence of weathering. Methods. About twenty representative samples were collected at a varying depth
Lawal, A.I., Ogunsola, N.O., Saliu, M.A.
core   +1 more source

Optical coherence tomography for vulnerability assessment of sandstone [PDF]

open access: yes, 2013
Sandstone is an important cultural heritage material, in both architectural and natural settings, such as neolithic rock art panels. The majority of deterioration effects in porous materials such as sandstone are influenced by the presence and movement ...
Bear   +22 more
core   +1 more source

Predicting Water Cycle Characteristics from Percolation Theory and Observational Data. [PDF]

open access: yes, 2020
The fate of water and water-soluble toxic wastes in the subsurface is of high importance for many scientific and practical applications. Although solute transport is proportional to water flow rates, theoretical and experimental studies show that heavy ...
Egli, Markus   +4 more
core   +2 more sources

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