Results 21 to 30 of about 12,654 (257)

A rock brittleness index based on the postpeak energy release rate and damage surface characteristics for brittle hard rock

Deep Underground Science and Engineering, EarlyView.
This study examines energy evolution in rock rupture via triaxial direct shear tests, exploring the impact of confining pressure and temperature on fracture surface randomness. A novel energy‐based brittleness index is proposed, validated experimentally, and compared with existing methods for reliability and accuracy.
Biao Wang, Zaobao Liu, Jing Xue, Bo Lu, Wei Zeng, Dengke Zhang   +5 more
wiley   +1 more source

Surface hydration‐induced damage in tight oil‐bearing sandy conglomerate reservoirs

Deep Underground Science and Engineering, EarlyView.
A series of techniques such as X‐ray diffraction, scanning electron microscopy, energy‐dispersive spectroscopy, conductivity tests, and infrared thermal imaging were used. The key findings are the identification of a two‐stage surface hydration process and the elucidation of the effects of various minerals and elements on the hydration process ...
Anbang Zhao, Shuheng Du, Yuan Zhang, Jinghong Hu, Bo Zhou, Yun Wei   +5 more
wiley   +1 more source

Spatial heterogeneity of sources of branched tetraethers in shelf systems: The geochemistry of tetraethers in the Berau River delta (Kalimantan, Indonesia)

, 2016
The bulk organic matter composition (total organic carbon (TOC) content and d13CTOC) and composition of isoprenoid and branched glycerol dialkyl glycerol tetraethers (GDGT) in surface sediments from 43 stations in the Berau River delta (east Kalimantan ...
Sinninghe Damsté, Jaap S., Organic geochemistry & molecular biogeology, Organic geochemistry, Sinninghe Damsté, J.S.   +3 more
core   +1 more source

The impact of forced closure on proppant distribution of hydraulic fracturing in shale formations

Deep Underground Science and Engineering, EarlyView.
Research findings demonstrate that implementing forced closure within shale formations can remarkably mitigate proppant settlement, concurrently increasing the effective propped surface area from 29.74% to 38.68%. Abstract Forced closure is widely used in conventional oil and gas reservoirs to promote uniform proppant placement.
Tongxuan Gu, Hanyi Wang, Quan Gan, Shuang Zheng   +3 more
wiley   +1 more source

Impact of CO₂ and pH on the distribution and stable carbon isotopic composition of microbial biomarker lipids [PDF]

, 2013
In addition to the more acknowledged consequences of climate change, such as global warming, the current human-induced increase of CO2 into the atmosphere is also responsible for a change in the chemical composition of seawater.
Schoon, P.L., Organic geochemistry & molecular biogeology, Organic geochemistry   +2 more
core  

Preferential degradation of leaf- vs. root-derived organic carbon in earthworm-affected soil

, 2020
Earthworms are integral parts of many ecosystems and may play a decisive role in determining whether soils function as carbon (C) sink or source. However, information on how earthworms affect the composition and stability of soil organic matter (SOM) is ...
Angst, Šárka, Peterse, Francien, GeoLab Algemeen, Organic geochemistry & molecular biogeology, Nierop, Klaas G.J., Organic geochemistry, Angst, Gerrit, Frouz, Jan   +7 more
core   +1 more source

Branched glycerol dialkyl glycerol tetraethers in Arctic lake sediments: Sources and implications for paleothermometry at high latitudes [PDF]

, 2014
Branched glycerol dialkyl glycerol tetraethers (brGDGTs) are analyzed indifferent lakes of the Mackenzie (Canadian Arctic) and Kolyma (SiberianArctic) River basins to evaluate their sources and the implications forbrGDGT-based paleothermometry in high ...
Holmes, R. Max, Zimov, Nikita, Vonk, Jorien E.; id_orcid, Peterse, Francien, Vonk, Jorien E., Holmes, Robert M., Organic geochemistry & molecular biogeology, Giosan, Liviu, Organic geochemistry, Eglinton, Timothy I.   +9 more
core   +1 more source

High atmospheric pressure rescues plant growth under humidity stress: A model for climate‐resilient deep underground agriculture

Deep Underground Science and Engineering, EarlyView.
High atmospheric pressure (120 kPa) in deep underground counteracts humidity‐induced physiological stress in plants, stabilizing water balance and enhancing antioxidative defenses. This synergy boosts biomass despite elevated humidity, demonstrating sustainable deep underground agriculture potential under climate uncertainty.
Yuxin He, Linglu Xu, Xiao Tan, Wenhua Zhuang, Naiwen Li, Chao Liu, Bo Tan   +6 more
wiley   +1 more source

Advances in vital‐sign prediction and early‐warning models for underground coal mine workers integrating environmental factors

Deep Underground Science and Engineering, EarlyView.
This review synthesizes advances in predicting miners' vital signs by integrating environmental monitoring (dust, temperature, and gas) with physiological data. It highlights multi‐source data fusion techniques and early‐warning models for enhanced occupational safety in underground coal mines.
Junji Zhu, Dawei Cui, Yingjie Liu, Yuntao Liang, Yue Zhang   +4 more
wiley   +1 more source

A seasonal study of particulate organic matter composition and quality along an offshore transect in the southern North Sea [PDF]

, 2017
We investigated temporal differences in particulate organic matter (POM) composition and quality in thewater column and sediment at three stations along a transect from the coast via Oyster Grounds toDogger Bank within the southern North Sea, using a ...
Middelburg, J.J., K. Soetaert, Soetaert, Karline, Organic geochemistry & molecular biogeology, Geochemistry, Organic geochemistry, Sinninghe Damsté, J.S., J.S. Sinninghe Damsté, J.J. Middelburg, Le Guitton, M., Soetaert, K., M. Le Guitton   +11 more
core   +1 more source