Results 11 to 20 of about 3,983 (257)
Evaluating methane inventories by isotopic analysis in the London region [PDF]
Scientific Reports, 2017 AbstractA thorough understanding of methane sources is necessary to accomplish methane reduction targets. Urban environments, where a large variety of methane sources coexist, are one of the most complex areas to investigate. Methane sources are characterised by specific δ13C-CH4 signatures, so high precision stable isotope analysis of atmospheric ...
G. Zazzeri +6 more
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On the volatile inventory of Titan from isotopic abundances in nitrogen and methane [PDF]
Planetary and Space Science, 1999 We analyze recently published nitrogen and hydrogen isotopic data to constrain the initial volatile abundances on Saturn's giant moon Titan. The nitrogen data are interpreted in terms of a model of non-thermal escape processes that lead to enhancement in the heavier isotope.
Lunine, Jonathan I. +2 more
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Contribution of Ryugu-like material to Earth’s volatile inventory by Cu and Zn isotopic analysis [PDF]
Nature Astronomy, 2022 Initial analyses showed that asteroid Ryugu's composition is close to CI (Ivuna-like) carbonaceous chondrites -the chemically most primitive meteorites, characterized by near-solar abundances for most elements. However, some isotopic signatures (e.g., Ti, Cr) overlap with other carbonaceous chondrite (CC) groups, so the details of the link between ...
Paquet, Marine +93 more
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Journal of Natural Resources and Environmental Management, 2020 Metode jatuhan radioisotop (Fallout Radio Nuclides) telah lama dimanfaatkan dan dikembangkan untuk mempelajari dan mengukur erosi tanah. Penelitian ini bertujuan menduga erosi/deposisi tanah di Sub DAS Ciesek, DAS Ciliwung Hulu menggunakan jatuhan ...
Sri Malahayati Yusuf +4 more
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Scoping Inventory Calculations for the Rare Isotope Accelerator [PDF]
, 2003 This document is a report on our activities in FY03 exploring nuclear safety and hazard analysis issues relevant to the Rare Isotope Accelerator (RIA). It is not clear whether DOE will classify the RIA as an accelerator facility subject to the accelerator-specific safety requirements of DOE Order 420.2A or as a nonreactor nuclear facility subject to ...
Ahle, L. E., Boles, J. L.
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Frontiers in Marine Science, 2017 Nitrogen is a key limiting nutrient that influences marine productivity and carbon sequestration in the ocean via the biological pump. In this study, we present the first estimates of nitrogen cycling in a coupled 3D ocean-biogeochemistry-isotope model ...
Christopher J. Somes +3 more
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Benthic-pelagic coupling and isotopic fractionation of barium in Kiel Bight, SW Baltic Sea
Frontiers in Marine Science, 2023 Barium (Ba) isotopes are a promising new tracer for riverine freshwater input to the ocean and marine biogeochemical cycling. However, many processes that affect Ba cycling at continental margins have not yet been investigated with respect to Ba isotope ...
Florian Scholz +8 more
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A METHOD TO IMPROVE DOSE ASSESSMENT BY RECONSTRUCTION OF THE COMPLETE ISOTOPES INVENTORY
Radiation Protection Dosimetry, 2016 Radiation shielding assessments may underestimate the expected dose if some isotopes at trace level are not considered in the isotopes inventory of the shielded radioactive materials. Indeed, information about traces is not often available. Nevertheless, the activation of some minor isotopic traces may significantly contribute to the dose build-up ...
Bonin, Alice, Tsilanizara, Aimé
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Assessment of neutron-induced activation of irradiated samples in a research reactor
Nuclear Engineering and Technology, 2023 The combination of MCNP6 and the FISPACT codes was used to predict inventories of radioisotopes produced by neutron exposure of a sample in a research reactor.
Ildikó Harsányi +6 more
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Nature Communications, 2019 Understanding the mechanism behind CO2 reduction catalysis is crucial in the development of high efficiency and activity catalysts. Here, authors employ kinetic isotope effects and proton inventory studies to assess catalyst mechanism and proton delivery
Yingshuo Liu, Charles C. L. McCrory
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