A three-terminal superconducting device composed of a semiconductor-coupled Josephson junction and an oxide-insulated gate was tested at 4.2K. It was possible to control the coherence length ξn in the semiconductorby applying a gate voltage; consequently, the junction's critical current, whichdepends on ξn', was changeable. Power dissipation and switching time constant would be expected to be approximately 1 μW and 10 ps, respectively.
An apparatus for generating a vibration potential has been improved by using a powerful electrodynamic vibrator with an accelerating force of 10kg weight. The accuracy of measurement of the vibration potential can be arranged tobe from ±0.20 μV up to ±0.07 μV. Using the apparatus, the measurements of the vibration potential in aqueous solutions of 1-1 electrolytes, 1-2 electrolytes and 2-1 electrolytes were carried out at concentrations rangingfrom 0.1N to 0.001N. The vibration potential of the electrolytes showed a linearrelationship to the atomic weight of the cation when the anion is fixed. From the theoretical discussion, it is clarified that the slope of the straight line isapproximately proportional to the transport number of the cation. It is proved that the value for ionic partial molar volume of the anion can be determined fromthis line, and obtained values are compared with the literature.
We have successfully applied X-ray Scattering radiography of scanning soller-slit oscillating method (SSO, below) to the observation of plastically deformed region initiated at a hole-notch in poly-crystalline metals. The observed image-contrast depends strongly on the relevant diffraction geometry. Under an appropriate diffraction condition a distinct image is given of the area due tothe plastic deformation. The scattering radiography SSO method has, thus, provedto be a useful technique for detecting the local plastic deformation in comparison with other conventional techniques.