نتایج جستجو برای: actinide
تعداد نتایج: 1114 فیلتر نتایج به سال:
Reduction-oxidation (redox) reactions of the redox couples An(VI)/An(V), An(V)/An(IV), and An(IV)/An(III), where An is an element in the family of early actinides (U, Np, and Pu), as well as Am(VI)/Am(V) and Am(V)/Am(III), are modeled by combining density functional theory with a generalized Anderson impurity model that accounts for the strong correlations between the 5f electrons. Diagonalizat...
Over 200 cases of actinide intake, occurring over the last 25 years, have been re-assessed. Cases were selected for which the intake date was known, there was both urine and faecal data and there was negligible interference from earlier intakes. The IMBA software was used to obtain a best fit to the data and establish an estimate of intake for each case. It is found that the magnitudes of the i...
We review recent observational and theoretical results concerning the presence of actinide nuclei on the surfaces of old halo stars and their use as an age determinant. We present model calculations which show that the observed universality of abundances for 56 < Z < 75 elements in these stars does not necessarily imply a unique astrophysical site for the r-process. Neither does it imply a univ...
Magnetoresistance studies in narrow 5f band materials show that a giant drop of electrical resistance accompanies frequently field-induced reorientation of uranium magnetic moments in antiferromagnets. We show that a strong spin-dependent scattering, originating in the strong 5f hybridization with conduction electron states, is the most plausible origin of this effect, the magnitude of which by...
Hollow microspheres featuring a hybrid lipid-cation multilamellar shell are prepared by hydration of a nucleoside based amphiphile with an aqueous solution containing either actinide or lanthanide salts. The physico-chemical data collected clearly indicate that the formation of these microspheres is a consequence of the following concomitant stabilizing factors: (i) hydrophobic interactions, (i...
We present a study of deformed nuclei in the framework of the sdg interacting boson model utilizing both numerical diagonalization and analytical 1=N expansion techniques. The focus is on description of high-spin states which have recently become computationally accessible through the use of computer algebra in the 1=N expansion formalism. A systematic study is made of high-spin states in rare-...
By using a relativistic linear augmented-plane-wave method, we clarify energy band structure and the Fermi surfaces of recently synthesized thorium compound ThRhIn5. We find several cylindrical Fermi surface sheets, which are similar to those of CeTIn5 (T=Ir and Co), PuTGa5 (T=Co and Rh), and AmCoGa5. We discuss such similarity among the compounds including rare-earth or actinide ions with diff...
A tetravalent cerium macrocyclic complex (CeLK4) was prepared with an octadentate terephthalamide ligand comprised of hard catecholate donors and characterized in the solution state by spectrophotometric titrations and electrochemistry and in the crystal by X-ray diffraction. The solution-state studies showed that L exhibits a remarkably high affinity toward Ce4+, with log β110 = 61(2) and ΔG =...
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