منابع مشابه
Experimental constraints on light elements in the Earth’s outer core
Earth's outer core is liquid and dominantly composed of iron and nickel (~5-10 wt%). Its density, however, is ~8% lower than that of liquid iron, and requires the presence of a significant amount of light element(s). A good way to specify the light element(s) is a direct comparison of density and sound velocity measurements between seismological data and those of possible candidate compositions...
متن کاملAbundances of light elements.
Recent developments in the study of abundances of light elements and their relevance to cosmological nucleosynthesis are briefly reviewed. The simplest model, based on standard cosmology and particle physics and assuming homogeneous baryon density at the relevant times, continues to stand up well.
متن کاملLight elements in the core: Effects of impurities on the phase diagram of iron
[1] The stable phase of iron (Fe) in the Earth’s core has been the subject of extensive studies, yet still remains controversial. Hexagonal close-packed structure (hcp) is the accepted stable form of pure Fe; however, it has been recently proposed that a body-centered-cubic (bcc) structured alloy of Fe with lighter elements would be a strong candidate. Experiments and ab initio calculations hav...
متن کاملMatrix Elements of Light Quarks
In this talk a review of theoretical and numerical results for matrix elements of light quark operators is presented. The review is focused on the definition, renormalization and improvement of operators relevant to different processes and on the evaluation of the corresponding physical amplitudes. At this Conference the main topics covered in the parallel sessions were electromagnetic and weak...
متن کاملLight Hadron Weak Matrix Elements
The kaon bag parameter BK , which is required for constraining the CP violation parameter in the Cabibbo-Kobayashi-Maskawa matrix from experiment, has been successfully calculated with the Kogut-Susskind(KS) quark action, taking advantage of its UA(1) chiral symmetry[1]. A recent systematic calculation of BK with high statistics[2], however, reveals that the systematic uncertainties in the pert...
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ژورنال
عنوان ژورنال: Nature Geoscience
سال: 2012
ISSN: 1752-0894,1752-0908
DOI: 10.1038/ngeo1700