Results 21 to 30 of about 330,203 (416)

The 8th ICGG International Conference on Gas Geochemistry Preface: Fluids and tectonics

open access: yesAnnals of Geophysics, 2007
The 8th International Conference on Gas Geochemistry provided the opportunity for scientists from different countries to meet each other, exchange ideas on the state of the art in gas geochemistry, and discuss advance in fluid geochemistry. The&
F. Italiano, E. Boschi, G. Martinelli
doaj   +1 more source

Underrated primary biogenic origin and lifetime of atmospheric formic and acetic acid

open access: yesScientific Reports, 2021
Formic and acetic acids are ubiquitous in the troposphere, playing an important role in the atmospheric chemistry. Recent model studies ended up with substantial low bias on their tropospheric budgets presumably due to a large missing biogenic source ...
Xinqing Lee   +6 more
doaj   +1 more source

A comparison of geochemical features of source rocks of Eocene Wenchang Formation in the deep and shallow water zones of Pearl River Mouth Basin, SE China

open access: yesShiyou shiyan dizhi, 2022
The Pearl River Mouth Basin (PRMB) is one of the important offshore targets for oil and gas exploration in China and has great potential of oil and gas resources.
Liping YUAN   +6 more
doaj   +1 more source

Mantle Hg isotopic heterogeneity and evidence of oceanic Hg recycling into the mantle

open access: yesNature Communications, 2022
This work demonstrates distinct mass-independent mercury isotope fractionation in global basalts, which suggests mantle Hg isotope heterogeneity and reveals large-scale translithospheric Hg recycling via plate tectonics.
Runsheng Yin   +12 more
doaj   +1 more source

Concentration, source identification, and exposure risk assessment of PM2.5-bound parent PAHs and nitro-PAHs in atmosphere from typical Chinese cities

open access: yesScientific Reports, 2017
Sixteen parent PAHs and twelve nitro-PAHs were measured in PM2.5 samples collected over one year (2013–2014) at nine urban sites in China. During the sampling period, concentrations of individual nitro-PAHs were one or two orders of magnitude lower than ...
Di Liu   +7 more
doaj   +1 more source

Composition and structure of natural organic matter through advanced nuclear magnetic resonance techniques

open access: yesChemical 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

Seasonal variations in metallic mercury (Hg0) vapor exchange over biannual wheat–corn rotation cropland in the North China Plain [PDF]

open access: yesBiogeosciences, 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]

open access: yes, 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

Numerical simulation of zonal disintegration of surrounding rock in the deep‐buried chamber

open access: yesDeep Underground Science and Engineering, Volume 1, Issue 2, Page 174-182, December 2022., 2022
Based on the finite difference software FLAC3D, the numerical simulation of cavern surrounding rock under different working conditions was carried out by using Bilinear Strain‐Softening Ubiquitous‐Joint Model (Subi). The effects of buried depth, cohesion and internal friction angle of surrounding rock on the discontinuous deformation are analyzed, and ...
Yukai Wang, Xiaoli Liu, Yanlin Xiong
wiley   +1 more source

Observations of atmospheric mercury in China: a critical review [PDF]

open access: yesAtmospheric 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

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