Results 1 to 10 of about 3,466,743 (324)

Exotic Structure of Carbon Isotopes [PDF]

Frontiers of Collective Motions, 2002
We studied firstly the ground state properties of C-isotopes using a deformed Hartree-Fock (HF)+ BCS model with Skyrme interactions. Shallow deformation minima are found in several neutron$-$rich C-isotopes.
Hagino, Kouichi, Sagawa, Hiroyuki, Suzuki, Toshio   +2 more
core   +4 more sources

Ab-initio coupled-cluster effective interactions for the shell model: Application to neutron-rich oxygen and carbon isotopes [PDF]

Physical Review Letters, 2014
We derive and compute effective valence-space shell-model interactions from ab-initio coupled-cluster theory and apply them to open-shell and neutron-rich oxygen and carbon isotopes.
Engel, J., Hagen, G., Jansen, G. R., Navratil, P., Signoracci, A.   +4 more
core   +5 more sources

Tracing the Deep Carbon Cycle Using Metal Stable Isotopes: Opportunities and Challenges

Engineering, 2019
The subduction of marine carbonates and carbonated oceanic crust to the Earth’s interior and the return of recycled carbon to the surface via volcanism may play a pivotal role in governing Earth’s atmosphere, climate, and biosphere over geologic time ...
Sheng-Ao Liu, Shu-Guang Li
doaj   +3 more sources

Thallium isotopes reveal protracted anoxia during the Toarcian (Early Jurassic) associated with volcanism, carbon burial, and mass extinction

Proceedings of the National Academy of Sciences of the United States of America, 2018
Significance Declining oxygen contents in today’s oceans highlight the need to better understand ancient, natural marine deoxygenation and associated extinctions.
T. Them, Benjamin C Gill, A. Caruthers, A. Gerhardt, D. Gröcke, T. Lyons, S. Marroquín, S. Nielsen, J. Trabucho Alexandre, J. Owens   +9 more
semanticscholar   +3 more sources

Carbon and Nitrogen Stable Isotopic Discrimination Factors Between Diet and Feces in Wild Giant Pandas [PDF]

Biology
Stable isotope analysis is very useful for studying animal nutritional ecology. Feces are the most accessible and non-invasive samples for short-term dietary reconstruction.
Guoyan Long, Yue Wu, Lu Huang, Yonggang Nie, Han Han   +4 more
doaj   +2 more sources

Constraints on carbonate diagenetic fluid properties by microzone in situ analysis of carbon and oxygen isotopes: a case study of Cambrian-Ordovician, Tarim Basin

Shiyou shiyan dizhi, 2023
As an important technological measure to uncover complex sedimentary-diagenetic process, microzone in situ geochemical analysis has drawn more and more attention along with improving analytical and test levels.
Jun HAN, Donghua YOU, Yixiong QIAN, Shaofeng DONG, Shoutao PENG   +4 more
doaj   +1 more source

USING STABLE ISOTOPES TO ESTIMATE TROPHIC POSITION: MODELS, METHODS, AND ASSUMPTIONS

Ecology, 2002
D. Post
semanticscholar   +3 more sources

Presenting the Compendium Isotoporum Medii Aevi, a Multi-Isotope Database for Medieval Europe

Scientific Data, 2022
Measurement(s) Isotopes Technology Type(s) Mass Spectrometry Factor Type(s) Carbon isotopes • nitrogen isotopes • sulfur isotopes • oxygen isotopes • strontium isotopes Sample Characteristic - Organism Humans • Animals • Plants Sample Characteristic ...
Carlo Cocozza, Enrico Cirelli, Marcus Groß, Wolf-Rüdiger Teegen, Ricardo Fernandes   +4 more
doaj   +1 more source

Application of Carbon Isotope Abundance Measurement by Mass Spectrometry in the Separation of Ethanol by Gas Diffusion Method

Journal of Isotopes, 2022
Ethanol is a feasible medium for diffusion separation of carbon isotopes. In order to obtain the separation coefficient of gas diffusion separation of ethanol, the application of elemental analysis isotope ratio mass spectrometry (EA-IRMS) to measure the
WANG Fei;PAN Jianxiong;ZHOU Mingsheng;JIANG Dongjun;LI Junjie
doaj   +1 more source

Sedimentary pyrite sulfur isotopes track the local dynamics of the Peruvian oxygen minimum zone

Nature Communications, 2021
To explore the importance of local vs. global sulfur-cycle controls on variations in pyrite sulfur isotopes, the authors couple carbon-nitrogen-sulfur concentrations and stable isotopes of sediments from the Peruvian oxygen minimum zone, identifying a ...
Virgil Pasquier, David A. Fike, Itay Halevy   +2 more
doaj   +1 more source