[en] The beam properties of a simple doublet configuration have been investigated systematically. The beam optical parameters have been calculated up to the chromatic and the third order aberration coefficients. By scanning a 250 lines/inch copper electron microscope mesh, the beam spot size was determined to be 16 x 18 μm² with the object aperture of 50 μm in diameter. The beam spot size was not decreased proportionally by replacing the object aperture size from 100 μm to 50 μm. In the present experimental arrangement, it is concluded that the beam size was restricted by chromatic aberration. (author)

[en] The Japan Linear Collider (JLC) requires a positron source which produces 8x10¹¹ particles per RF-pulse. A computer simulation shows the possibility of such an intense positron source using conservative technology. In order to verify the performance of the positron source experimentally, a prototype positron source has been designed and is now being manufactured. The prototype positron source consists of stationary target unit, DC solenoid magnets, pulsed flux concentrator, and an accelerating structure. It will be installed downstream of 1.54 GeV S-band linac of the Accelerator Test Facility (ATF). (author)

[en] Human hair collected from the mercury, arsenic and cadmium polluted areas has been analysed by instrumental neutron activation method. The concentrations of 27 elements were compared with those of normal Japanese. Correlation coefficients of logarithmic concentrations between the elements were calculated and their significance levels were determined. Factor contribution and factor loadings of the elements were calculated for each factor by making use of principal component analysis. The factor score of each sample was also calculated for each factor to examine the effects of the contamination by heavy metals on individuals. (author)

[en] Human hair collected from the mercury, arsenic and cadmium polluted areas was analyzed by instrumental neutron activation method. The concentrations of 27 elements were compared with those of normal Japanese population. Correlation coefficients of logarithmic concentrations between the elements were calculated and their significant levels were determined. Factor contribution and factor loadings of the elements were calculated for each factor. The factor score of each sample was also calculated to examine the effects of the contamination by heavy metals on individuals. (author) 7 refs.; 4 figs.; 5 tables

[en] The masses of hyperons and the H-particle are calculated in the color dielectric model within a framework of self-consistent calculation of quarks, color dielectric field and effective gluon. Reasonably good agreements are obtained concerning the masses of hyperons by adjusting a mass parameter of the strange quark. The calculated magnetic moments agree well with the observed values for octet baryons except for the nucleon. The binding energy of the H-particle is estimated to be in the range from 100 MeV to 210 MeV depending on models used. The color magnetic energy is found to give rise to a repulsive force in the ΛΛ channel, in marked contrast to the result of the MIT bag model. (orig.)

[en] By using 72 and 52 MeV ³He²⁺ beams, electron capture from Ag and Sn target Κ shells has been successfully measured with high resolution magnetic spectrograph. The results are reasonably well explained by eikonal approximations

[en] Published in summary form only

[en] The existence of a vacancy band in a series of niobium metal compounds, NbO, NbN and NbC, has been established by calculations using the DV-Xα cluster method. The vacancy band originating from the anion vacancies appears below the Fermi level. This band is mainly occupied by the Nb-4d electrons. Such an enhancement in the partial density of states of Nb-4d below the Fermi level is perhaps related to the stability of these compounds with a large number of vacancies. (author)

[en] The effect of combined addition of phosphorus and titanium on dislocation loop formation and void swelling of austenitic Fe-Cr-Ni alloys under electron irradiation has been investigated with a HVEM. It was shown that phosphorus atoms (or phosphorus-titanium complexes) serve as nuclei for interstitial loops in the alloy containing both phosphorus and titanium as well as alloys containing phosphorus only. In the alloy containing phosphorus and titanium, vacancy loops were formed at higher temperatures compared with an alloy containing phosphorus only. As a result, a substantial suppression of void formation was observed, suggesting that the co-addition of phosphorus and titanium is very effective for increasing the swelling resistance. (orig.)

[en] Three types of contact formation techniques on Y₁Ba₂Cu₃O_7-δ(YBCO) ceramics have been studied. These techniques are spot welding, ultrasonic soldering and thin film deposition. The electrical properties of the contacts are analyzed to find a low resistive contact. The contacts are grouped into two classes according to the temperature dependence of their resistances. The interface between thin film contact and YBCO are analyzed by ESCA. Causes of resistance for both classes of contacts are proposed. Minimum resistivity is achieved for the contact of silver wire directly bonded by spot welding and thermally annealed in oxygen