Results 21 to 30 of about 275,795 (382)
Chemical and Biological Technologies in Agriculture, 2017 Natural organic matter (NOM) plays important roles in biological, chemical, and physical processes within the terrestrial and aquatic ecosystem. Despite its importance, a clear and exhaustive knowledge on NOM chemistry still lacks.
Dainan Zhang +4 more
doaj +1 more source
Observations of atmospheric mercury in China: a critical review [PDF]
Atmospheric Chemistry and Physics, 2015 China presently contributes the largest amount of anthropogenic mercury (Hg) emission into the atmosphere in the world. Over the past decade, numerous studies have been conducted to characterize the concentration and forms of atmospheric Hg in China ...
X. W. Fu +5 more
doaj +1 more source
Seasonal variations in metallic mercury (Hg0) vapor exchange over biannual wheat–corn rotation cropland in the North China Plain [PDF]
Biogeosciences, 2016 Air–surface gas exchange of Hg0 was measured in five approximately bi-weekly campaigns (in total 87 days) over a wheat–corn rotation cropland located on the North China Plain (NCP) using the relaxed eddy accumulation (REA) technique.
J. Sommar +4 more
doaj +1 more source
Oxygen isotope geochemistry of the second HSDP core [PDF]
, 2003 Oxygen isotope ratios were measured in olivine phenocrysts (~1 mm diameter), olivine microphenocrysts (generally ~100–200 µm diameter), glass, and/or matrix from 89 samples collected from depths down to 3079.7 m in the second, and main, HSDP core (HSDP-2)
Eiler, John M. +2 more
core +1 more source
Dynamical Geochemistry: Mantle dynamics and its role in the formation of geochemical heterogeneity [PDF]
arXiv, 2023 Chemical geodynamics is a term coined nearly forty years ago to highlight the important link between Earth's geochemical evolution and plate tectonics & mantle convection. Significant progress in our understanding of this connection has taken place since then through advances in the analytical precision of geochemical measurements, dramatically ...
arxiv
Radioactive heat production of six geologically important nuclides [PDF]
Geochemistry, Geophysics, Geosystems 18(9), 3530-3541 (2017), 2017 Heat production rates for the geologically important nuclides ${}^{26}$Al, ${}^{40}$K, ${}^{60}$Fe, ${}^{232}$Th, ${}^{235}$U, and ${}^{238}$U are calculated on the basis of recent data on atomic and nuclear properties. The revised data differ by several per cent from some older values, but indicate that more recent analyses converge toward values with
arxiv +1 more source
Discriminating cool-water from warm-water carbonates and their diagenetic environments using element geochemistry: the Oligocene Tikorangi Formation (Taranaki Basin) and the dolomite effect [PDF]
, 2004 Fields portrayed within bivariate element plots have been used to distinguish between carbonates formed in warm- (tropical) water and cool- (temperate) water depositional settings.
Al‐Aasm I. S. +14 more
core +2 more sources
Petroleum Science, 2017 A number of condensate reservoirs with high concentrations of H2S have been discovered in the deep dolomite reservoirs of the lower Ordovician Yingshan Formation (O1y) in the Tazhong Uplift, where the formation water has a high pH value.
Jin Su +11 more
doaj +1 more source
Spatial distribution of mercury deposition fluxes in Wanshan Hg mining area, Guizhou province, China [PDF]
Atmospheric Chemistry and Physics, 2012 The legacy of long-term mining activities in Wanshan mercury (Hg) mining area (WMMA), Guizhou, China including a series of environmental issues related to Hg pollution. The spatial distribution of gaseous elemental mercury (Hg0) concentrations in ambient
Z. H. Dai +4 more
doaj +1 more source
Novel color center platforms enabling fundamental scientific discovery [PDF]
, 2020 Color centers are versatile systems that generate quantum light, sense magnetic fields and produce spin-photon entanglement. We review how these properties have pushed the limits of fundamental knowledge in a variety of scientific disciplines, from rejecting local-realistic theories to sensing superconducting phase transitions.
arxiv +1 more source