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The synthesis of (U,Th)O(2) solid solutions at a relatively low temperature of 1100 °C using a new technique is described. First, separate actinide oxides were reacted with ammonium hydrogen fluoride to form ammonium actinide fluorides at room temperature. Subsequently, this fluoride was converted to an actinide oxide solid solution using a two-phase reaction process, which involved heating of the fluoride first at 610 °C in static air followed by heating at 1100 °C in flowing argon. Oxide solid solutions of UO(2) and ThO(2) were synthesized for a ThO(2) content from 10 to 90 wt %. Microscopic investigation showed that the (U,Th)O(2) solid solutions synthesized using this method had high crystallinity and homogeneity up to nanoscale. 相似文献
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H. v. Wartenberg B. Lerner-Steinberg J. Geidel W. Rehwinkel T. Gaydo A. Perrier P. E. Verkade J. Coops Jr. E. Cohen S. Miyake J. A. van der Hoeve C. Moureu W. P. White F. Karas A. Mennucci W. Sturm E. Berner J. Peters J. W. Davis E. L. Wallace W. Kohen S. H. Regester G. B. Watkins J. V. Hunn C. A. Myers Jr. W. Groose W. Dinkler A. Herberholz J. S. G. Thomas M. Barash H. Löffler 《Analytical and bioanalytical chemistry》1930,82(11-12):455-456
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Silva GW Yeamans CB Weck PF Hunn JD Cerefice GS Sattelberger AP Czerwinski KR 《Inorganic chemistry》2012,51(5):3332-3340
Using a new, low-temperature, fluoride-based process, thorium nitride imide of the chemical formula Th(2)N(2)(NH) was synthesized from thorium dioxide via an ammonium thorium fluoride intermediate. The resulting product phase was characterized by powder X-ray diffraction (XRD) analysis and was found to be crystallographically similar to Th(2)N(3). Its unit cell was hexagonal with a space group of P3m1 and lattice parameters of a = b = 3.886(1) and c = 6.185(2) ?. The presence of -NH in the nitride phase was verified by Fourier transform infrared spectroscopy (FTIR). Total energy calculations performed using all-electron scalar relativistic density functional theory (DFT) showed that the hydrogen atom in the Th(2)N(2)(NH) prefers to bond with nitrogen atoms occupying 1a Wyckoff positions of the unit cell. Lattice fringe disruptions observed in nanoparticle areas of the nitride species by high-resolution transmission electron microscopic (HRTEM) images also displayed some evidence for the presence of -NH group. As ThO(2) was identified as an impurity, possible reaction mechanisms involving its formation are discussed. 相似文献
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J. K. Brooks Kazuyuki Saitô JD Maitland Wright 《Rendiconti del Circolo Matematico di Palermo》2003,52(1):5-14
LetA be aC*-algebra with second dualA″. Let (φ
n)(n=1,...) be a sequence in the dual ofA such that limφ
n(a) exists for eacha εA. In general, this does not imply that limφ
n(x) exists for eachx εA″. But if limφ
n(p) exists whenever p is the range projection of a positive self-adjoint element of the unit ball ofA, then it is shown that limφ
n(x) does exist for eachx inA″. This is a non-commutative generalisation of a celebrated theorem of Dieudonné. A new proof of Dieudonné’s theorem, for
positive measures, is given here. The proof of the main result makes use of Dieudonné’s original theorem. 相似文献
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The magnetic hysteresis of Fe57Ni43/Si(100) with magnetic anisotropy induced by an external field has been studied by Brillouin light scattering (BLS). The results are compared with those of the magneto-optic-Kerr-effect (MOKE) measurement and the vibrating sample magnetometer (VSM). The BLS results show that the sample film has strong in-plane anisotropy. The angle between the magnetization and a 4.6 G applied magnetic field H reaches a maximum value of 45° when H lies along the hard axis. The coercivity and magnetic anisotropy field for the film obtained by the BLS are compared with the values obtained by the VSM and MOKE measurement. 相似文献
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The eigen frequencies of radial pulsations of neutron stars are calculated in a strong magnetic field. At low densities we
use the magnetic BPS equation of state (EOS) similar to that obtained by Lai and Shapiro while at high densities the EOS obtained
from the relativistic nuclear mean field theory is taken and extended to include strong magnetic field. It is found that magnetized
neutron stars support higher maximum mass whereas the effect of magnetic field on radial stability for observed neutron star
masses is minimal. 相似文献
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R. Rosen A. E. Robertson E. A. Budge W. Vaubel B. Rosenbaum Conradson E. J. Poth W. D. Armstrong C. C. Cogburn J. R. Bailey L. M. Henderson S. W. Ferris J. M. Mc Ilvain A. R. Fortsch W. G. Whitman J. Marcusson W. Bauerschäfer P. F. Gordon J. Merry E. B. Hunn H. G. M. Fischer A. J. Blackwood C. R. Wagner J. Hyman B. Gosman J. Heyrovsky A. W. Trusty und H. G. Vesper 《Fresenius' Journal of Analytical Chemistry》1932,90(3-4):146-158
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