[en] We have observed a telegraph-like noise in dc superconducting quantum interference devices (SQUID's) made of low-temperature synthesized superconducting Y-Ba-Cu oxide thin films. The voltage of the SQUID jumps among two to four discrete levels randomly with time, and exhibits a Lorentzian type frequency dependence in the power spectrum. Periodic modulations of the voltage with magnetic flux are observed in a SQUID having narrow bridges of submicrometer width. The flux noise of the SQUID is dominated by the telegraph-like noise at low frequencies

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[en] Solution chemistry and corrosiveness of boiling nitric acid solutions were examined by means of chemical analyses and corrosion tests for eliminating corrosion acceleration factors of materials used in Purex reprocessing process. The formation rate of oxidizing ions like Cr⁶⁺ from Cr³⁺ in nitric acid which accelerates transpassive corrosion of stainless steels was measured as functions of the concentration of nitric acids, heating time, heat fluxes and ion contents. This rate depended on the thermal decomposition amounts of NO_X gas and the evaporation rate of nitric acid. The formation mechanism of such oxidizing ions was interpreted that is highly oxidizing atmosphere formation due to the thermal decomposition of chemically unstable nitric acid at high temperatures. The catalysis effect of platinum group metals on such oxidation reaction was revealed. Instead of batch tests like Huey test, a new testing method used a rotary evaporator was developed to control quantitatively the environmental condition. Characteristics of trans-passive corrosion of austenitic stainless steels were clarified with respect to phosphorous segregation. (author)

[en] We have measured the proton and deuteron spin structure functions g₁^p and g₁^d in the region of the nucleon resonances for W² < 5 GeV² and Q² ≅ 0.5 and Q² ≅ 1.2 GeV² by inelastically scattering 9.7 GeV polarized electrons off polarized ¹⁵NH₃ and ¹⁵ND₃ targets. We observe significant structure in g₁^p in the resonance region. We have used the present results, together with the deep-inelastic data at higher W², to extract Γ(Q²) (triple_bond) ∫₀¹ g₁(x,Q²) dx. This is the first information on the low-Q² evolution of Gamma toward the Gerasimov-Drell-Hearn limit at Q² = 0