Results 1 to 10 of about 3,447,602 (330)

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.
G. Jansen, J. Engel, G. Hagen, Petr Navrátil, A. Signoracci   +4 more
semanticscholar   +5 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

Stable carbon isotopes and human evolution. [PDF]

Proc Natl Acad Sci U S A, 2013
Klein RG.
europepmc   +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

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

Stable carbon isotopic compositions of individual light hydrocarbons in the C–C range in natural gas from the Qaidam Basin, China

Energy Exploration & Exploitation, 2023
C 5 –C 7 light hydrocarbons are important components in petroleum and are extensively employed as an auxiliary approach in petroleum research. Consensus on the mechanism of light hydrocarbon generation has not yet been achieved.
Chen Zhang, Daoyong Zhang, Wenli Ma, Kefei Chen, Jing Li, Shixin Zhou   +5 more
doaj   +1 more source

Centrifugal Separation of Carbon and Chlorine Isotopes Using Freon-11 as Processing Gas

Journal of Isotopes, 2017
In order to explore the effective ways for high-abundance carbon and chlorine isotopes production, a method to acquire high-abundance carbon-12 and chlorine-35 isotopes simultaneously was presented by gas centrifugation process using Freon-11 as ...
PEI Gen;ZHOU Ming-sheng;JIANG Dong-jun
doaj   +1 more source

Inter-Laboratory Comparison of Measuring Organic Carbon and Stable Nitrogen Isotopes in Marine Sediments by Elemental Analysis-Isotope Ratio Mass Spectrometry

Yankuang ceshi, 2020
BACKGROUND Organic carbon and nitrogen stable isotopes (δ13C, δ15N) in marine sediments are used as effective indicators to trace the changes of air, temperature, precipitation and other parameters in different geological time. Elemental analysis-isotope
CHANG Wen-bo, LI Feng, ZHANG Yuan-yuan, HE Xing-liang   +3 more
doaj   +1 more source