Results 41 to 50 of about 107,558 (336)

Sedimentary facies controlled biogeochemical process of biotic extinction and turnover across the Cambrian SPICE event

Communications Earth & Environment
The Steptoean positive carbon isotope excursion (SPICE) event, one of the largest carbon cycle perturbations in the Cambrian, coincides with shallow-shelf-fauna extinction and plankton revolution (critical transition of plankton).
Haozhe Wang, Haizu Zhang, Yiman Zhang, Bin Cheng, Qian Deng, Donghui Wang, Guanyu Zhao, Zewen Liao   +7 more
doaj   +1 more source

Identification of animal fats via compound specific δ13C values of individual fatty acids: assessments of results for reference fats and lipid extracts of archaeological pottery vessels

Documenta Praehistorica, 2002
The possibility of obtaining molecular information from lipid residues associated with archaeological pottery has dramatically increased the potential for deriving new information on the use of ancient vessels and the commodities processed therein ...
Richard P. Evershed, Stephanie N. Dudd, Mark S. Copley, Anna Mutherjee   +3 more
doaj   +1 more source

Coastline Fractal Dimension of Mainland, Island, and Estuaries Using Multi-temporal Landsat Remote Sensing Data from 1978 to 2018: A Case Study of the Pearl River Estuary Area

Remote Sensing, 2020
The Pearl River Estuary Area was selected for this study. For the past 40 years, it has been one of the most complex coasts in China, yet few studies have analyzed the complexity and variations of the area’s different coastlines.
Xinyi Hu, Yunpeng Wang
doaj   +1 more source

Tissue-Specific Distribution of Legacy and Emerging Organophosphorus Flame Retardants and Plasticizers in Frogs

Toxics, 2021
Five types of tissues, including the liver, kidney, intestine, lung, and heart, were collected from black-spotted frogs and bullfrogs to study the tissue-specific accumulation of organophosphorus flame retardants (PFRs) and plasticizers.
Yin-E Liu, Xiao-Jun Luo, Ke-Lan Guan, Chen-Chen Huang, Xue-Meng Qi, Yan-Hong Zeng, Bi-Xian Mai   +6 more
doaj   +1 more source

An assessment of stress and production rate of sucker rod heat pipes in oil well pumping system

Deep Underground Science and Engineering, EarlyView.
The sucker rod pumping system is the preferred oil extraction technique. The concept about equipping the hollow vacuum space in solid sucker rods with heat pipe has been scrutinized in terms of stress and oil production evaluation. Abstract The implementation of the heat pipe concept in sucker rods for oil pumping systems negates the requirement for an
R. S. Anand, Ang Li, Wenbo Huang, Juanwen Chen, Qingshan Ma, Fangming Jiang   +5 more
wiley   +1 more source

Timescales for the development of methanogenesis and free gas layers in recently-deposited sediments of Arkona Basin (Baltic Sea) [PDF]

, 2012
Arkona Basin (southwestern Baltic Sea) is a seasonally-hypoxic basin characterized by the presence of free methane gas in its youngest organic-rich muddy stratum.
Dale, Andy W., Fossing, H., Mogollón, J. M., Regnier, P.   +3 more
core  

Human-induced fire regime shifts during 19th century industrialization: A robust fire regime reconstruction using northern Polish lake sediments

, 2019
Fire regime shifts are driven by climate and natural vegetation changes, but can be strongly affected by human land management. Yet, it is poorly known how humans have influenced fire regimes prior to active wildfire suppression. Among the last 250 years,
Blarquez, Olivier, Brauer, Achim, Brykała, Dariusz, Dietze, Elisabeth, Dietze, Michael, Hopmans, Ellen C., Jażdżewski, Krzysztof, Obremska, Milena, Organic geochemistry, Organic geochemistry & molecular biogeology, Ott, Florian, Pieńczewska, Anna, Schouten, Stefan, Schreuder, Laura T., Słowiński, Michał   +14 more
core   +1 more source

Genetic mechanism of bicyclic sesquiterpanes in Upper Triassic source rock of Yinan 2 well from the Kuqa Depression of Tarim Basin, China

Scientific Reports
Bicyclic sesquiterpanes are widely distributed in terrigenous sedimentary organic matter and are serve as valuable biomarker in the field of organic geochemistry.
Yiman Zhang, Haizu Zhang, Hanyu Deng, Liangliang Wu, Bin Cheng, Yunpeng Wang, Zewen Liao   +6 more
doaj   +1 more source

Honey-collecting in prehistoric West Africa from 3500 years ago

Nature Communications, 2021
Though there is a long archaeological record of the use of honey, beeswax and other bee products, there are few known records from Africa. Here Dunne et al.
Julie Dunne, Alexa Höhn, Gabriele Franke, Katharina Neumann, Peter Breunig, Toby Gillard, Caitlin Walton-Doyle, Richard P. Evershed   +7 more
doaj   +1 more source

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