No abstract available

[en] Optical coupling between a spherical microresonator and a plane dielectric substrate is investigated for a small sphere whose diameter is only a few ten times as large as the optical wavelength. A unique characteristic of small microresonators, relaxation of the phase-matching requirement that is due to the small size, is demonstrated on the basis of experimental results and model numerical calculations. The difference between the frequency and the propagation constant as parameters to describe the resonances of microresonators is clarified. Based on the numerical results, intrinsic restriction on a distance between the resonator and the coupler is also suggested. [copyright] 2001 Optical Society of America

[en] Aiming at a formulation of the unified constitutive model of cyclic plasticity and creep, the concept of the effective stress which is defined as stress measured from the current center of yield surface, is employed to explain the intermittent creep period after cyclic prestraining. Then the experimental results show a marvelous regularity which might make us easily to construct the unified constitutive model. (author)

[en] The clinical efficacy of salivary gland scintigraphy was evaluated in 32 histologically proven cases. In benign tumors, except Warthin's tumor, 16 of the 20 cases (80%) appeared as cold lesions. All six cases of Warthin's tumor appeared as hot lesions. In malignant tumors, one case each of mucoepidermoid carcinoma, adenopapillary carcinoma, and adenoid-cystic carcinoma were shown as cold lesions, while squamous cell carcinoma and malignant mixed tumor were delineated as a defect image (no uptake of radionuclide). On stimulation with ascorbic acid, retention of radionuclide within the tumor was noted only in Warthin's tumors, but it was noted at the periphery of the tumors in 21 of the 24 cases (87.5%), which might be due to inflammation and/or compression of the gland by the tumors. Salivary gland scintigraphy provided useful information for the evaluation of the site of the tumor and the function of the salivary gland

[en] Time dependent case of the spontaneous compactification of spacetime is investigated. Considering a scalar field in such a spacetime, it is shown that the field which is initially a singlet changes to the multiplet due to the nonstaticity of the spacetime. (author)

[en] This paper describes a modeling study for general corrosion of copper which is a candidate material for high-level radioactive waste overpacks. The model is a mixed-potential model combined with diffusive transport of reactants and reaction products. The rest potential and corrosion rate of copper in aerated solution were measured while controlling the thickness of a diffusive solution layer on the copper surface using a rotating-disk electrode. Experimental data were used for validation of the model

No abstract available

[en] We give an electromagnetic generalization of the Robinson-type identity for black holes. We discuss the relation between the two solutions of the Einstein-Maxwell equations. The possibility of proving the complete electromagnetic generalization of the Kerr uniqueness theorem is also discussed

[en] The corrosion behavior of tantalum and niobium in hydrobromic acid solutions free from or containing bromine has been studies using electrochemical and mass loss techniques corrosion behavior as a function of temperature, HBr/sub 2/ concentration, electrode potential, and exposure time has been examined. Both metals are passivated in HBr solutions ranging in concentration up to the azeotropic composition of 47 weight percent (wt%) and temperatures as high as l24 C. The corrosion rate of tantalum in a hydrogen bubbled 47 wt% HBr solution at l24 C was less than 2 milligrams per dm/sup 2/ and day (mdd) and that of niobium at l00 C was 20 mdd. The corrosion rates tended to decrease with decreasing temperature and HBr concentration and with increasing exposure time and electrode potential. The presence of bromine reduced the corrosion rates. Bromine is a passivating agent

No abstract available