[en] Complex formation of ⁹⁵Tc microquantities with humic acid is studied. Addition of Sn²⁺, used as a reducer to the mixture, containing ^95mTc, humic acid 0.1 mole/l NaClO₄ (pH 4), leads to simultaneous formation of technetium and aluminium complexes with formic acid (Tc-Ha, Sn-HA). The Tc-HA complex yield equals 50-70%. The results obtained make it possible to consider that the Tc-HA complexes constitute the basic technetium form, formed under reduction conditions, characteristic of depth subsoil waters, containing humic acid

[en] The paper discusses measures to improve nuclear power plant performance and their implementation based on the nuclear plant management philosophy and the business practices of utilities in Japan. Key elements for shortening the duration of the annual inspection outage, long cycle operation and reducing forced outages are described. (author). 2 figs

No abstract available

[en] A condition to achieve a mass separation of an ion beam at a given energy by means of applying a transverse radio frequency (rf) electric field was derived. Effectiveness of the scheme was examined with a He ion beam of energy below 2 kV. An array of four-stage electrodes produced distributed 13.56 MHz rf field to realize a function of a velocity filter. When the extraction voltage of the beam was adjusted to yield a velocity predicted from the theory, the beam current showed transmission as large as 80% through the array of electrodes

[en] Spin fluctuations in frustrated Y_0.97Sc_0.03Mn₂ have been studied by μ⁺SR. The relaxation rate increases monotonically with decreasing temperature and is not appreciably changed by the longitudinal field, in contrast with that in Y_0.97Sc_0.03(Mn_0.9Al_0.1)₂. These results imply fluctuations in a quantum spin liquid. ((orig.))