Results 51 to 60 of about 330,203 (416)
Geochemistry of Aquatic Sediments [PDF]
Journal of Chemistry, 2017 The type and composition of freshwater and marine sediments are key factors in environmental research of (a) natural processes such as sediment transport and accumulation, biodiversity, and biogeochemical reactions within sediments and (b) evaluation of source and progress of contamination, as aquatic sediments act as a sink for nonorganic and organic ...
Stanislav Frančišković-Bilinski +2 more
openaire +3 more sources
Compositional data analysis -- linear algebra, visualization and interpretation [PDF]
arXiv, 2021 Compositional data analysis is concerned with multivariate data that have a constant sum, usually 1 or 100\%. These are data often found in biochemistry and geochemistry, but also in the social sciences, when relative values are of interest rather than the raw values. Recent applications are in the area of very high-dimensional "omics" data.
arxiv
CHNOSZ: Thermodynamic Calculations and Diagrams for Geochemistry
Frontiers in Earth Science, 2019 Thermodynamic calculations are an essential tool for many areas of geochemistry. Thermodynamics provides a framework for the quantitative description and prediction of the solubilities and relative stabilities of different minerals, metal transport in ...
Jeffrey M. Dick
semanticscholar +1 more source
The Mersey Estuary : sediment geochemistry [PDF]
, 2012 This report describes a study of the geochemistry of the Mersey estuary carried out between April 2000 and December 2002. The study was the first in a new programme of surveys of the geochemistry of major British estuaries aimed at enhancing our ...
Bee, E. +20 more
core
Selenium Geochemistry and Health [PDF]
AMBIO: A Journal of the Human Environment, 2007 Selenium (Se) is a naturally occurring metalloid element, which is essential to human and other animal health in trace amounts but is harmful in excess. Of all the elements, Se has one of the narrowest ranges between dietary deficiency ( 400 µg day-1) (1) making it necessary to carefully control intakes by humans and other animals hence the importance
openaire +5 more sources
Angewandte Chemie International Edition, Accepted Article.Discovering novel oxygen evolution reaction (OER) (pre)catalysts with exceptional catalytic activity and long‐term stability is pivotal for advancing technologies aimed at decarbonization. In this study, we present the ternary Ba8Ni6Ge40 phase with a clathrate structure exhibiting remarkable performance in alkaline OER. When integrated into an alkaline
Ziliang Chen +7 more
wiley +1 more source
Equilibration in the Aftermath of the Lunar-Forming Giant Impact [PDF]
K. Pahlevan, D. J. Stevenson, Equilibration in the aftermath of
the lunar-forming giant impact. Earth Planet. Sci. Lett. 262, 438 (2007), 2010 Simulations of the moon-forming impact suggest that most of the lunar material derives from the impactor rather than the Earth. Measurements of lunar samples, however, reveal an oxygen isotope composition that is indistinguishable from terrestrial samples, and clearly distinct from meteorites coming from Mars and Vesta.
arxiv +1 more source
Archaeological Prospection, EarlyView.ABSTRACT This paper presents the interdisciplinary investigation (archaeology, geochemistry, history) of a medieval silver and lead production site located in southern France, in the Minier valley (Occitanie, Aveyron, Le‐Viala‐du‐Tarn). In order to identify the production sites, in situ geochemical surveys were carried out using a portable X‐ray ...
Céline Tomczyk +3 more
wiley +1 more source
Characteristics of stable carbon isotopic composition of shale gas
Journal of Natural Gas Geoscience, 2016 A type Ⅱ kerogen with low thermal maturity was adopted to perform hydrocarbon generation pyrolysis experiments in a vacuum (Micro-Scale Sealed Vessel) system at the heating rates of 2 °C/h and 20 °C/h.
Zhenya Qu +5 more
doaj +1 more source
The Isotope Geochemistry of Zinc and Copper
, 2017 Copper, a native metal found in ores, is the principal metal in bronze and brass. It is a reddish metal with a density of 8920 kg m−3. All of copper’s compounds tend to be brightly colored: for example, copper in hemocyanin imparts a blue color to blood ...
F. Moynier +3 more
semanticscholar +1 more source