[en] Using the time-evolution BC code, DYACOCT, we investigate the image acceleration of Xe^q+ ions (q=1-33) with energies 3.7 q keV which are scattered under a grazing angle of incidence from an Al (1 1 1) surface. We solve the coupled rate equations of the population P_n of the nth shell of the projectile, where electron capture, electron loss, Auger deexcitation and peeling-off process are explicitly included. For surface scattering of Xe^q+, we determine the screening lengths of highly charged Xe ions interacting with surface atoms, based on those electron distributions. The calculated image energies were compared with the experimental works of Winter et al., and we got the reasonable agreement with the experimental image energies for q<25. The discrepancy between simulation and experiment is found for q > 25. This discrepancy is mainly due to the breakdown of the assumption employed in the experiment that the surface scattering is always the specular reflection

[en] Published in summary form only

No abstract available

[en] (00 π)-type antiferromagnetism appears in the CeZn_1-xCd_x with x ≤ 0.50, whereas ferromagnetism is stabilized for x ≥ 0.60. At the intermediate content with x = 0.55, a spin-glass is observable at low temperature. Such an antiferromagnetic to ferromagnetic transition occurs at the same critical concentration x_c = 0.55 as the structural instability occurs

[en] In the shape-memory alloy, NiTi:Fe, the martensitic transformation is well separated from the premartensitic (PM) phase and the latter can be studied in detail. X-ray diffraction studies in the PM phase reveal satellites near q vector/sub I/ = 1/3(0,1,1) and q vector/sub II/=1/3(1,1,1). For both q values, the satellites are incommensurate and the surprising feature observed is that the incommensurate wave vector delta vector and the width of the satellites depend upon the Brillouin zone studied. This contradicts a simple condensed charge-density and/or lattice-wave description of the PM phase. If the shift is neglected, the structure in the PM phase can be explained by a condensation of three [zeta,zeta,0)TA₂ modes with zeta = 1/3. In addition we propose a relationship between the well-known omega phase and the PM phase observed in this experiment and for other alloys

[en] The effects of the number of zone passes on the orientations of recrystallized grains are studied in rolled and annealed Mo and Ta crystals with a (111)[1^-1^-2] orientation. The recrystallized texture of Mo which has been zone-refined only once is mainly composed of (511)[1^-05] and (310)[001] components, whereas that of Mo which has been zone-refined three times is composed of a sharp single (110)[001] component. In Ta which has been zone-refined once, the recrystallized texture is composed of (110)[001] and (1^-1^-5)[5^-5^-2^-] components, the latter having a twin relationship with the rolled matrix. In Ta which has been zone-refined three times, the (110)[001] component is still predominant but the (110)[001] component decreases and the (1^-1^-5)[5^-5^-2^-] component increases with increasing number of zone passes. Most of the recrystallized grains are in good coincidence with the rolled matrix. (Auth.)

[en] The authors of this paper experienced a case of perforation of small intestine due to a detached part of polyurethane biliary endoprosthesis after radiation therapy. This case urged us to study experimentally the influence of the interaction between radiation and bile on different materials of internal stents. Six kinds of tubes were examined: nylon, polyvinyl chloride (radiopaque and radioparent), polyethylene, ethylenevinyl acetate copolymers and polyurethane. After exposure of tubes to radiation (total dose, 45 Gy: 3 Gy/day x 5 days/week x 3 weeks) and/or to bile (4 weeks)

No abstract available

[en] An ultrasonic inside-diameter (ID) control system was used during the final etching process for producing Zircaloy nuclear fuel cladding tubes. This results in establishing automatic inside-diameter control during etching with an automatic etching system. In this system, the inside-diameter at the center point in the length of each tube is continuously measured with the ultrasonic inside-diameter measuring equipment during the etching process and the etching is automatically stopped by a signal from the control equipment when the inside-diameter reaches the target value. This made the final etching process economical and suitable for large-scale production, having an equal or better level at the inside-diameter of tubes etched with this system than those made by a process controlled by an air-micrometer

[en] The Moessbauer spectroscopic measurements have been carried out on (Fe_1-xRu_x)₂P (x=0 and 0.02) at T=5 and 300 K. The magnetic moment in Fe₂P in the ferromagnetically ordered state has been estimated to be about 0.76 μ_B and 1.97 μ_B for Fe site I and II, respectively at T=5 K. For (Fe_0.98Ru_0.02)₂P, however, it is found that there are three sites I, II, and III, ordering antiferromagnetically, and the magnetic moments are estimated to be about 0.66 μ_B and 1.89 μ_B for Fe(I) and Fe(II), respectively