This paper describes recent progress of Josephson integrated circuit technology. The progress has been rapid since the junction material was changed from lead-alloy to niobium. It is now feasible to make logic circuits with a few thousand gates and memory circuits with a few thousand bits. The speed of these circuits is much faster than that of semiconductors. Although the size of the circuits is not so large, we can make whole components necessary for Josephson computers. Next step is to install these components in a closed cycle refrigerator, and to demonstrate its high-speed performance.
“Glossary of Terms Relating to Superconductors” is enacted as JIS-H7005-1991. The content and the history till the establishment are commented. Two hundred and forty-nine terms relating to the field of superconductivity are classified into nine class and their meanings and definition are given in this JIS. The background of JIS and new movement of international standardization are explained. This JIS was translated into English and is now used as a base material for international standardization.
Metals and alloys are commonly used as structural materials for cryogenic applications, because those materials are reliable, less expensive, weldable and so on. In this paper, author reviews mechanical properties, fracture and deformation behavior of structural materials of metals, and also introduces a testing procedure of mechanical test at liquid helium temperature.