[en] The report focuses on selective separation of molybdenum(VI), gallium(III) and copper(II) with long chain alkylated 8-quinolinol such as 5-octyloxymethyl-8-quinolinol (HO₈Q) and 2-methyl-5-octyloxymethyl-8-quinolinol (2-Me-HO₈Q) investigated based on extraction equilibrium. The hydrophobic effect of various substituents at 5-position of 8-quinolinol on copper(II) extraction in acidic medium is compared with that of Kelex 100. The extraction rate-controlled separation of nickel(II) with HO₈Q from cobalt(II) is also investigated. Observation and discussion are made of distribution constant and acid-dissociation constant of HO₈Q, extraction of metal ions with 5-octyloxymethyl-8-quinolinol or 5-dioctylaminomethyl-8-quinolinol, separation of copper(II) from iron(III), copper(II) extraction equilibrium, extraction of molybdenum(VI) with HO₈Q, extraction constant for extraction of molybdenum(VI) with HO₈Q, effect of diverse ions on determination of molybdenum(VI), separation of gallium(III) with HO₈Q and 2-Me-HO₈Q, composition of Ga(III)-HO₈Q, extraction equilibrium of cobalt(II) with HO₈Q, extraction equilibrium of nickel(II) with HO₈Q, kinetics of extraction of nickel(II) with HO₈Q, and separation of nickel(II) from cobalt(II). (N.K.)

[en] GT-MHR is a high effective nuclear power generating plant that combines a modular high temperature gas cooled reactor having passive safety characteristics with the direct cycle helium gas turbine. Fuji Electric is participating this project in cooperation with General Atomics of the U.S.A., the Russian Ministry of Atomic Energy, and Framatome of France, with the aim of the realization of GT-MHR. Fuji Electric, on behalf of GA, MINATOM, Framatome and Fuji Electric, introduces in this paper the outline of this project and the main system of the GT-MHR plant. (author)

[en] This paper evaluates left ventricular diastolic filling (LVDF) in patients with type I diabetes mellitus (DM) in order to identify increased risk for subsequent cardiac events. The authors obtained radionuclide ventriculograms in 54 patients with type I DM. Median follow-up for cardiac complications was 63 months. We assessed peak filling rate (PFR; in end diastolic volume [EDV] per second), first 1/2 filling fraction (1/2 FF), and first 1/2 filling fraction/R-R interval (1/2 FF/R-R) by analysis of convariance to account for effects of age and R-R interval. Cardiac complications ere found in 15 of 54 patients

[en] The effects of addition of rare-earth oxides on the magnetic properties of Nd-Fe-B sintered magnets are studied. The addition of Dy₂O₃ and Tb₄O₇ leads to an increase in intrinsic coercivity. For addition of Dy₂O₃, the optimum conditions for powder mixing and the optimum Dy₂O₃ particle size were determined. A mixing time of more than 10 minutes, and a Dy₂O₃ particle size of less than 3 μm, are required to obtain a high intrinsic coercivity. EPMA measurements of NdFeBAl magnets with Dy₂O₃ added reveal an inhomogeneous distribution of Dy in the Nd₂Fe₁₄B matrix: the material is Dy-rich near grain boundaries, but Dy-poor within the matrix. The appearance of such an inhomogeneous distribution of Dy is attributed to the reduction of Dy₂O₃ in the Nd-rich phases, followed by diffusion of the resulting Dy atoms into the matrix

[en] Electroplated CoNiFe films with a saturation flux density as high as 2.1 T are potentially useful in high-density magnetic recording heads. The authors found that films electroplated at a high current density (15 mA/cm²) from a bath without saccharin have a sufficient anodic pitting-corrosion potential (-65 mV). The authors also found that the pitting-corrosion potential of films electroplated under a low current density (5 mA/cm²) from saccharin-free baths have anodic pitting-corrosion potentials of less than minus300 mV. However, the corrosion resistance improved after annealing at temperatures above 100 C. The crystal-grain boundaries in the as-plated film that electroplated under a low current density from saccharin-free baths are not clear (i.e., that the phase is amorphous). But the crystal grain boundaries in the annealed film are clear. Films electroplated from baths containing saccharin also have anodic pitting-corrosion potentials of less than minus300 mV. Their corrosion resistance did not improve when they were annealed at 250 C. The deterioration of the corrosion resistance is attributed to the defects that increase the face-centered cubic (111) lattice constant. One of the most important characteristics of a highly corrosion-resistant CoNiFe film is fine crystal structure with very few defects

[en] The microstructure and the compositions of the constituent phases in a sintered Sm(Co_0.72Fe_0.20Cu_0.055Zr_0.025)_7.5 permanent magnet with different cooling processes have been investigated by transmission electron microscopy and the three-dimensional atom probe (3DAP) technique. The Cu concentration in the SmCo₅ phase increases during slow cooling from 820 to 520 deg. C, having a wider concentration profile than that of Sm at cell boundaries. Enrichment of Cu at the triple junction of cell boundaries was also found. These results explain the substantial increase in coercivity during the slow cooling process. High resolution transmission electron microscopy and nano-beam electron diffraction analysis have confirmed that the Z-phase is Zr(Co, Fe)₃, having the Be₃Nb structure with a∼0.5 nm, c∼2.4 nm. In the Z-phase, Sm is almost completely replaced with Zr during slow cooling

[en] This paper evaluates the usefulness of P-31 MR spectroscopy with an ISIS localization technique in monitoring skeletal tumor response to therapy. MR spectroscopy (1.5 T, 14-cm surface coil, repetition time of 2,000 msec) with an ISIS three-dimensional localization technique was performed before treatment in 5 patients with malignant skeletal tumor (osteogenic sarcoma in 3 and synovial sarcoma in 2). Follow-up MR spectroscopy was performed at least twice after initiation of presurgical chemotherapy and/or irradiation. The area of total phosphorus signals was measured after baseline correction for quantitative analysis. Surgical specimens were examined pathologically for the area of necrosis and correlated with the phosphorus signal changes in MR spectra

[en] The synergistic effect on the extraction of thorium(IV) was found by the combination of 2-thenoyltrifluoroacetone (Htta) and 1.10-phenanthroline (phen) or 4.7-diphenyl-1.10-phenanthroline (dpp) as a neutral bidentate ligand. Especially in the presence of dpp (1*10^-3M) in benzene, the distribution ratio of thorium(IV) increased by a factor of about 300. Such synergistic enhancement of the extraction was ascribed to the formation of the adduct complex of Th(tta)₄(phen) and Th(tta)₄(dpp) in the organic phase. The extraction constant and the adduct formation constant were determined and discussed. (author) 18 refs.; 5 figs

[en] At gastroscopy of 656 patients, complete gastic erosions were found in 58 (11%). Radiography performed in 46 or these demonstrated erosions in 21 of 33 with a time span less than one month between radiography and gastroscopy but in only 4 of 13 with a time span of one to 3 months. Double contrast technique supplemented with films of compressed barium-filled antrum demonstrate the lesions best. Complete erosions have often appearances simulating gastric polyps or large mucosal folds and are often found together with ulcers. (Auth.)

[en] To investigate the applicability of heat pipe to the decay hat removal (DHR) system of the modular HTRs, pre-conceptual design of the Heat Pipe DHR System was performed, and the comparative study of various passive decay heat removal (DHR) system of modular HTRs was carried out. The results show that the Heat Pipe DHR System is applicable to the modular HTRs and its heat removal capability was sufficiently comparable to the other passive DHR systems previously developed. Especially, by applying the variable conductance heat pipe, possibility of a fully passive DHR system with lower heat loss during normal operation is suggested. (author)