National Institute of Advanced Industrial Science and Technology

Akira Shoji

Naoki Shirakawa

Hiroshi Takashima

Mitsuru Itoh

Ruiping Wang

Hirotake Yamamori

Mayumi Ishizaki

Hirotaka Yamamori

A capacitance temperature sensor in which temperature is measured by detecting capacitance of a parallel plate condenser which comprises a dielectric material comprising strontium titanate single crystal in which (a) 30% by weight or less of oxygen-or (b) 30% by weight to 50% by weight of oxygen-is substituted with oxygen-isotope.

Capacitance temperature sensor and temperature measuring device

A programmable voltage standard element which consists of Josephson junction arrays having Josephson junction devices which are connected in series generates constant voltage by impression of bias current and microwave. The voltage standard element has bias current terminals each of which is provided for a respective section comprising a Josephson junction devices of in-series connection that are divided by the number of the nth power of 3. A bias current supply circuit independently impresses bias current of a predetermined value to a bias current terminal for every section. A controlling circuit controls a bias current supply circuit to impress bias current of a predetermined value to a Josephson junction array of each section and control impression of microwave.

Voltage standard apparatus

A Josephson junction has a Si substrate, a two layer film comprising an amorphous MgO layer and a high orientation MgO layer on the Si substrate, and a NbN film or the NbCN film laminated on the two layer film.

Method for forming Josephson junction, Josephson junction and apparatus using Josephson junction

Growing community of inventors

Ibaraki, Japan

Akira Shoji