Enrichment is a difficult and expensive process, using gas centrifuges or large magnetic separators (methods used by Iraq prior to 1991), or else large gas-diffusion arrays.
[edit] Enrichment
Main article: Enriched uranium
Cascades of gas centrifuges are used to enrich uranium ore to concentrate its fissionable isotopes.
Enrichment of the Space Between the Stars
The most common elements, like carbon and nitrogen, are created in the cores of most stars, fused from lighter elements like hydrogen and helium.
enrichment (isotope) - (n.)
The process by which the proportion of one isotope of an element is increased relative to the others.
entropy - (n.) ...
Enrichment of uranium ore through isotope separation to concentrate the fissionable uranium-235 is needed for use in nuclear power plants and nuclear weapons.
The enrichment of the IGM may go beyond supernova ejecta leaking from galaxies and clusters, back to the first generation of massive stars before galaxy formation proper occurred.
Job enrichmentJob File TableJob for a Cowboy
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"This enrichment of heavy water provides strong evidence that water loss is occurring in the upper atmosphere and that Venus was probably more humid and Earth-like in the distant past," says Emmanuel Marcq of the LATMOS laboratory in France.
Chemical Enrichment
The process in which a star manufactures chemical elements, such as carbon and oxygen, in the nuclear reactions in its interior and then ejects these elements into space.
The lighter of the two isotopes is enriched, relative to the heavier species, and is collected by a probe downstream for further enrichment or analysis.
The mantle has a low silica content and siderophile enrichment with olivine and pyroxene widespread. Discontinuities produced by changes in mineral phases are also present.
Other elemental/oxide enrichments found in pyroxenes include MnO, TiO2, Al2O3, and Cr2O3.
Moreover, it is in line with the vision expressed by the Late King Hussein as far as the enrichment of man's life with all sorts of knowledge.
For example, recent studies of the Cretaceous/Tertiary boundary, which marks the abrupt demise of a large number of biological species including dinosaurs, revealed unusual enrichments of siderophile elements and shock metamorphic features that are ...
It appears to be either a super metal-rich dwarf or a slightly metal-poor K0 subgiant (Baliunas et al, 1997), but a recent study suggests that the metals enrichment may have been primordial (Santos et al, 2001).
study distant (therefore younger) galaxies
star formation, chemical enrichment, gas dispersal
? early times; top down or bottom up ?
" Sites receiving this award are distinguished by the quality of their content alone, if it serves the interests of discovery, mental enrichment and thoughtful enjoyment. Dr. Matrix says, "This award doesn't go to 'cool' sites.
From the old, metal-poor globular clusters to the young, metal-rich open clusters, we observe this enrichment process in action. Our Sun is the product of many such cycles. We ourselves are another.
Opportunities are provided for gifted students from public and private schools from across the Commonwealth of Virginia to explore professional and university environments through artistic and academic enrichment tailored to their aspirations, ...
Some of the organic molecules in these meteorites are known to have an interstellar origin because they contain large deuterium enrichments and the spectral match suggests that the organics in the diffuse ISM and in meteorites may be related.
This in turn gives insight on how stars form, their composition, and the chemical enrichment of the surrounding area. As well, young remnants are a great learning tool to better understand the physics of supernova explosions.
few billion years it should become a giant and then a white dwarf. Now the surface is enriched in metals. Believe Sirius B (its white dwarf companion) passed material to Sirius A during the process of becoming a white dwarf and caused the enrichment.
The great mass-loss suffered by supergiants can strip some of them of their outer envelopes to the point that we see huge surface enrichments of helium, nitrogen, and carbon that have been made by nuclear fusion.
 See also: Element, Time, Earth, Light, Elements
  
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