Results 11 to 20 of about 930,809 (352)
Astronomische Nachrichten, 2014 AbstractThe measurement of isotopic ratios provides a privileged insight both into nucleosynthesis and into the mechanisms operating in stellar envelopes, such as gravitational settling. In this article, we give a few examples of how isotopic ratios can be determined from high‐resolution, high‐quality stellar spectra.
Caffau, E. +6 more
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The Isotopes of Americium [PDF]
Physical Review, 1950 Three new americium activities (Am{sup 238}?, Am{sup 243}, and Am{sup 244?}, the latter two formed by n,{gamma} reactions) are described and some additional information is given on previously reported americium isotopes.
Street, K, Jr., Ghiorso, A, Seaborg, G T
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On isotopisms and strong isotopisms of commutative presemifields [PDF]
Journal of Algebraic Combinatorics, 2011 In this paper we prove that the $P(q,\ell)$ ($q$ odd prime power and $\ell>1$ odd) commutative semifields constructed by Bierbrauer in \cite{BierbrauerSub} are isotopic to some commutative presemifields constructed by Budaghyan and Helleseth in \cite{BuHe2008}.
MARINO, Giuseppe, POLVERINO, Olga
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Ecology and Evolution, 2021 When Pacific salmon (Oncorhynchus spp.) spawn and die, they deliver marine‐derived nutrient subsidies to freshwater and riparian ecosystems. These subsidies can alter the behavior, productivity, and abundance of recipient species and their habitats ...
Nicola F. Rammell +3 more
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Iron isotope effect on the superconducting transition temperature and the crystal structure of FeSe_1-x [PDF]
, 2010 The Fe isotope effect (Fe-IE) on the transition temperature T_c and the crystal structure was studied in the Fe chalcogenide superconductor FeSe_1-x by means of magnetization and neutron powder diffraction (NPD).
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Journal of Groundwater Science and Engineering, 2021 Shale gas exploration and development carry the risk of causing groundwater contamination and enhancing the greenhouse effect through methane leakage. Identifying the source of abnormal methane in groundwater of shale gas development areas is becoming a ...
Zhao-xian Zheng +2 more
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The oxygen isotope effect on critical temperature in superconducting copper oxides [PDF]
, 2004 The isotope effect provided a crucial key to the development of the BCS (Bardeen-Cooper-Schrieffer) microscopic theory of superconductivity for conventional superconductors.
A Mourachkine +8 more
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The vanadium isotopic constitution of petroleum asphaltenes: La Luna Formation (Venezuela) [PDF]
Journal of the Serbian Chemical Society, 2000 High resolution mass spectrometry indicates that the isotopic abundance of 50Vanadium (V) of the Late Cretaceous La Luna petroleum asphaltenes and related source kerogen of marine origin (both highly enriched with V > 2000 ppm) is higher by ...
Premović Pavle I. +7 more
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High-precision measurements of seawater Pb isotope compositions by double spike thermal ionization mass spectrometry [PDF]
, 2014 A new method for the determination of seawater Pb isotope compositions and concentrations was developed, which combines and optimizes previously published protocols for the separation and isotopic analysis of this element.
Bridgestock, L +4 more
core +2 more sources