[en] Fluorometry has a possible use for on-line uranium concentration monitoring in raffinate of the codecontamination process in fuel reprocessing plants, since it has an intrinsically high sensitivity and a capability for remote monitoring using fiber optics. The raffinate are typically 2.5 to 3.5 mol/dm³ of nitric acid solution, including 10 to 100 mg/dm³ of uranium and almost 7 g/dm³ of coexisting ions. The latter ions include ∼ 30 species and are fission products, actinides, and corrosion products. Since UO₂²⁺ fluorescence is considered to be influenced by the coexisting species, the effects were studied using a simulated solution of the raffinate in the present report. The calculated results for UO₂²⁺ fluorescence are shown. Comparison of the calculated results with the experimental values indicates that reduction by the absorption of the excitation beam and the fluorescence is ∼ 90% and the rest is by quenching. Therefore, uranium concentration can be measured within an accuracy of approximately +/- 10% only by the correction for the reduction of fluorescence by absorption, which can be easily realized by measuring absorbance of the sample solution

[en] The spin-flop behavior of the magnetization and the magnetostrictive change associated with spin-flop transition are clearly observed in Tb-Fe/Fe multilayers. It is found that the easy axis of the Tb-Fe thin film changes into in-plane from the perpendicular direction by multilayering with Fe and a large magnetostriction value can be obtained around the Laves phase composition by utilizing the exchange coupling at interfaces

[en] Fe_0.7Co_0.3 alloy has a large magnetostriction value and a high saturation magnetization. They have investigated the magnetostriction and magnetic properties of bcc Fe-Co-RE (RE a rare earth element) films. These films were prepared by dc triode sputtering. Addition of the RE elements Pr and Tb was found to increase the magnetostriction, while addition of the RE elements Ce, Nd, Sm and Er decreased it. These alloys film all exhibited high saturation magnetization values in excess of 200 emu/g. The high saturation magnetization appeared on addition of a small percentage of the RE element. Such films may be useful as soft magnetic materials

No abstract available

[en] Fluorimetry can possibly be used in the process of in-line uranium concentration monitoring in raffinate during the codecontamination process in nuclear fuel reprocessing plants, since it has an intrinsic high sensitivity and a capability for remote monitoring using fiber optics. Before its practical application, factors influencing UO₂²⁺ fluorescence, such as temperature, coexisting species, etc., must be examined. In this paper, the effect of temperature on UO₂²⁺ fluorescence was studied in a system without coexisting species

[en] In the analysis of the temperature dependence of the ¹H NMR second moment of (PyH)AuBr₄, it is shown to be important to take the variation of the potential of molecular motions with temperature into account. (orig.)

[en] The formation process of Nb/sub 3/Al by a solid state reaction between Nb and Al is examined for both powder metallurgy processed wires and sputtered multilayer films. It is turned out that the diffusion of Al into Nb layer plays an important role in the formation process of Nb/sub 3/Al, but the extremely thin Nb thickness is not necessarily needed for the solid state reaction on the basis of the study of multilayered films. The authors discuss on the relationship between the Nb layer thickness and the areal reduction ratio to the Nb/sub 3/Al formation in the powder metallurgy process

[en] Thin films were prepared by a rf reactive sputtering method as a preliminary experiment for preparing long Bl-NbN wire. Optimum sputtering conditions were experimentally assessed and determined by measuring the dependence of critical temperature and critical current density on process parameters such as nitrogen and argon partial pressure, rf discharge power, substrate temperature, and sample thickness

[en] Magnetic domain structures in two layered 300-550 A thick Co/sub 80/Nb/sub 10/Ti/sub 10/ films with magnetostatic coupling across nonmagnetic layer with thickness d from 8 to 800 A were examined through transmission Lorentz microscopy at 200 kV. At d = 20 A the coupling of two layers is strongest and two layers are magnetized in parallel direction except the coupled Neel wall regions. At d = 40-160 A domains in two layers are magnetized in independent directions but strong coupling between the domain walls in both layers causes complicated domain configuration. The characteristic vertical pair domains and 90⁰ walls play a role to result flux closure between the layers. The maximum thickness of 180⁰ wall reaches 4000 A at this d range

[en] The magnetic properties of an amorphous ferromagnet, Fe(4.7)Co(70.3)Si(15)B(10), were studied. The purpose of this study was to establish the mean magnetic moment per transition metal (TM) atom in the alloy, and to examine the possible magnetic excitation at higher Q. The experiment was performed at room temperature using the D5 spectrometer. The sample was magnetically saturated in a magnetic field to avoid depolarization effects. The measurement was made using neutrons with wavelength of 0.84 A. The reduced radial distribution function DR(r) derived from the interference intensity function i(Q) gives the correlation function T(r), the radial distribution function RDF(r), and the pair distribution function PF(r). The obtained magnetic moment per TM atom was in agreement with the magnetic moment deduced from bulk magnetization measurement. The D5 spectrometer was arranged in a configuration such that it was a triple axis analogue of Mook's time of flight apparatus. In this configuration, two kinds of magnon-neutron inelastic events are allowed. The most remarkable feature of the results was that polarization dependent (SF) scattering was not observed. A well defined polarization independent (NSF) scattering was observed, which was detected close to the position of the first maximum in S(Q). The counting time involved in a single incident wavelength inelastic scan ranged from 10 to 15 hours, compared with the counting time of about one week used by Mook. (Kato, T.)