Results 71 to 80 of about 105,636 (305)

A theoretical model on the formation mechanism and kinetics of highly toxic air pollutants from halogenated formaldehydes reacted with halogen atoms [PDF]

Atmospheric Chemistry and Physics, 2013
The atmospheric reactions of halogenated formaldehydes with halogen atoms were investigated by high-accuracy molecular orbital calculation. Our studies showed that compared to X-addition pathway, the H-abstraction pathway was demonstrated to be more ...
Y. M. Ji, H. H. Wang, Y. P. Gao, G. Y. Li, T. C. An   +4 more
doaj   +1 more source

Normal background concentrations of contaminants in the soils of England : available data and data exploration [PDF]

, 2011
This draft report describes the completed Work Package 1 and 2 tasks of the Defra commissioned Science and Research Project SP1008 - Establishing data on normal/background levels of soil contamination in England.
Ander, E.L., Cave, M.R., Johnson, C.C., Palumbo-Roe, B.   +3 more
core  

A new, ~4500‐year varve record and high‐resolution tephrochronology from lake Hämälänlampi, eastern Finland, provides age constraints for the Furnas C and the Glen Garry/Askja A‐2000 eruptions

Journal of Quaternary Science, EarlyView.
ABSTRACT The northern European distal cryptotephra framework is constantly developing both in terms of identification of new tephra horizons and improved age constraints for the already well‐established tephra marker horizons. However, many prehistoric tephra layers have only been dated by the radiocarbon method, with its inherent problems.
Maarit Kalliokoski, Veera Erola, Saija Saarni   +2 more
wiley   +1 more source

Evolution of mechanical properties of organic-rich shale during thermal maturation

Scientific Reports
Accurate assessment of the mechanical properties of organic matter, clay matrix, and bulk shale during maturation remains a challenge. Here, we aim to assess the mechanical properties of organic-rich shale during maturation using a combination of ...
Jianfeng Wang, Dayong Liu, Jianfei Shi, Chao Yang, Yuke Liu, Guozhi Wang, Huijuan Guo, Peng Liu, Yongqiang Xiong, Ping’an Peng   +9 more
doaj   +1 more source

Chromatography-vacuum low temperature method of methane enrichment and isotopic fractionation in gas samples

Shiyou shiyan dizhi
Methane (CH4) clumped isotope analysis plays a crucial role in the fields of climate change, energy exploration, and planetary research. The purity of CH4 in samples directly affects the precision and accuracy of high-resolution mass spectrometry in ...
Qingmei LIU, Jiacheng LI, Wenmin JIANG, Yongqiang XIONG   +3 more
doaj   +1 more source

Impact of Sugarcane Management Practices and Time Periods on Soil Organic Carbon and δ13C Signature After Paddy Rice Conversion

Land Degradation &Development, EarlyView.
ABSTRACT Land use change (LUC) from paddy rice to sugarcane cultivation strongly influences soil organic carbon (SOC) stocks, with the extent and direction of change depending on residue management and time since conversion. This study aimed to (i) evaluate SOC stock changes under different residue management practices and conversion periods following ...
Nipon Mawan, Nuttapon Khongdee, Chunling Luo, Wanwisa Pansak   +3 more
wiley   +1 more source

Chemical signatures of the Anthropocene in the Clyde Estuary, UK: sediment hosted Pb, 207/206 Pb, Total Petroleum Hydrocarbons (TPH), Polyaromatic Hydrocarbon (PAH) and Polychlorinated Bipheny (PCB) pollution records [PDF]

, 2011
The sediment concentrations of total petroleum hydrocarbons (TPHs), polyaromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), Pb and 207/206Pb isotope ratios were measured in seven cores from the middle Clyde estuary (Scotland, UK) with an aim ...
Chenery, S.R., Harrison, I., Jones, D.G., Kim, A.W., Moss-Hayes, V., Vane, C.H.   +5 more
core   +1 more source

Tips and Tricks for Organizing a Summer School—A Case Study Based on the “Nexus of Organic Matter Analytical Developments” School

Limnology and Oceanography Bulletin, EarlyView.
Abstract In June 2025 we organized and ran the first “Nexus of Organic Matter Analytical Developments” (NOMAD) Summer School at the Tjärnö Marine Laboratory in Sweden. In this article, we describe its development and implementation, with the aim of offering practical insights into the planning process, a generalizable framework for future summer ...
Alexander J. Craig, Alina Mostovaya, Juliana D'Andrilli, Angela Douglass, Niamh Gurrin, Sarah Messenger, Ava McIlvaine, Gabriel Gustavo Monteiro, Penghui Li, Amir Reza Shahabinia, Brett Walker, Makayla Ward, Margot E. White, Urban J. Wünsch, Jeffrey A. Hawkes   +14 more
wiley   +1 more source

Organic Carbon Burial following the Middle Eocene Climatic Optimum (MECO) in the central - western Tethys

, 2010
We present trace metal geochemistry and stable isotope records for the middle Eocene Alano di Piave section, NE Italy, deposited during magnetochron C18n in the marginal Tethys Ocean. We identify a $\sim$ 500 kyr long carbon isotope perturbation event we
C. Agnini, D. J. A., D. Rio, E. Fornaciari, G. Muttoni., H. Pälike, L. Giusberti, L. Lanci, Spofforth, V. Luciani   +9 more
core   +1 more source

The Evolution of Autonomous Systems for Planetary Cave Exploration: A Review

Journal of Field Robotics, EarlyView.
ABSTRACT The exploration of Subsurface Access Points (SAPs), such as lava tubes on the Moon and Mars, has gained significant interest due to their potential as stable environments shielded from surface radiation and temperature extremes. These sites are considered high‐value targets for detecting water and signs of ancient life, and assessing their ...
Sarah Swinton, Daniel Mitchell, Jamie Blanche, Euan McGookin, David Flynn   +4 more
wiley   +1 more source