Results 21 to 30 of about 515,139 (357)

dragon: A New Tool for Exploring Redox Evolution Preserved in the Mineral Record

open access: yesFrontiers in Earth Science, 2020
The flow of energy and elements between the geosphere and biosphere can be traced through changing redox chemistry of Earth’s surface. Deep-time trends in the mineral record, including mineral age and elemental composition, reveal a dynamic history of ...
Stephanie J. Spielman, Eli K. Moore
doaj   +1 more source

Ti-Fe mineralization in Bafq anomaly no. 15, Central Iran: Insights to mineralogy and mineral chemistry [PDF]

open access: yesپترولوژی, 2021
The Ti- Fe mineralization in Bafq 15 anomaly located 35 Km NW of Bafq city, and is a part of Poshte Badam Block in the Central Iran. Mineralization including magnetite, titanomagnetite, ilmenite, and minor pyrite which hosted by gabbro and pyroxenite ...
Sakine Amraei   +4 more
doaj   +1 more source

Carbon mineralization and microbial activity in agricultural topsoil and subsoil as regulated by root nitrogen and recalcitrant carbon concentrations [PDF]

open access: yes, 2018
Aims Mechanisms of subsoil carbon sequestration from deep-rooted plants are elusive, but may contribute to climate change mitigation. This study addressed the role of root chemistry on carbon mineralization and microbiology in a temperate agricultural ...
Elsgaard, Lars   +4 more
core   +1 more source

Evaluation of the performance of four chemical transport models in predicting the aerosol chemical composition in Europe in 2005 [PDF]

open access: yes, 2016
© Author(s) 2016.Four regional chemistry transport models were applied to simulate the concentration and composition of particulate matter (PM) in Europe for 2005 with horizontal resolution 20 km.
Butler, Tim   +16 more
core   +3 more sources

Mineral chemistry and thermobarometry of gabbroic rocks from the Pargeh area (NE Qazvin): A key for understanding the crystallization conditions [PDF]

open access: yesپترولوژی
Introduction Mineral chemistry data as well as petrography provide a comprehensive picture of magma crystallization conditions that support the conclusions based on geochemical data. In addition, the chemical composition of minerals such as clinopyroxene,
Nahid Naseri   +4 more
doaj   +1 more source

Palladinized graphene oxide-MOF induced coupling of Volmer and Heyrovsky mechanisms, for the amplification of the electrocatalytic efficiency of hydrogen evolution reaction

open access: yesScientific Reports, 2021
In this study, a nanocomposite of palladium supported graphene oxide (GO)/metal–organic framework (MOF) was prepared using electroless deposition of Pd on GO followed by impregnation method of Pd@GO and MOF. The prepared materials were characterized with
Mogwasha D. Makhafola   +6 more
doaj   +1 more source

Changes in dissolved iron deposition to the oceans driven by human activity: a 3-D global modelling study [PDF]

open access: yes, 2015
The global atmospheric iron (Fe) cycle is parameterized in the global 3-D chemical transport model TM4-ECPL to simulate the proton- and the organic ligand-promoted mineral-Fe dissolution as well as the aqueous-phase photochemical reactions between the ...
Baker, Alex   +5 more
core   +2 more sources

Kinetics Study of Solvent and Solid-Phase Extraction of Rare Earth Metals with Di-2-Ethylhexylphosphoric Acid

open access: yesMetals, 2020
The kinetic features of solvent and solid-phase extraction of yttrium and iron (III) from simulated and industrial phosphoric acid solutions are revealed.
Olga Cheremisina   +4 more
doaj   +1 more source

Computer simulation of structure and dimensions of oxygen-octaadric clusters in lithium niobate crystal and the dynamics of their development with changes in composition [PDF]

open access: yesФизико-химические аспекты изучения кластеров, наноструктур и наноматериалов, 2017
The peculiarities of formation of energetically equilibrium dipole oxygen-octahedral clusters in the structure of a ferroelectric crystal of lithium niobate (LiNbO3) have been studied by computer simulation.
V.M. Voskresensky   +3 more
doaj   +1 more source

Evidence of hydrological control of Sr behavior in stream water (Strengbach catchment, Vosges mountains, France) [PDF]

open access: yes, 2002
Strontium and particularly 87Sr/86Sr ratios in stream water have often been used to calculate weathering rates in catchments. Nevertheless, in the literature, discharge variation effects on the geochemical behavior of Sr are often omitted or considered ...
Amiotte-Suchet   +48 more
core   +2 more sources

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