Sumitomo Electric Industries, Limited

National Institute of Advanced Industrial Science and Technology

Takahiko Kitamura

Nozomu Kawabe

Yukihiro Oishi

Nobuyuki Mori

Toshifumi Hosoya

Moriyasu Ichino

Ryuichi Inoue

Shingo Kaimori

Koji Mori

Nobuyuki Okuda

Masatada Numano

Isao Karube

Osamu Mizuno

Tomoko Ishikawa

Masao Gotoh

Hideaki Nakamura

There are provided a magnesium alloy coil stock having good flatness and a method for producing the magnesium alloy coil stock, and a magnesium alloy structural member that uses the coil stock and a method for producing the magnesium alloy structural member. The coil stock is obtained by coiling a sheet composed of a magnesium alloy in a cylindrical shape, and the internal diameter of the coil stock is 1000 mm or less. The coil stock can be produced by rolling a cast material obtained by subjecting a magnesium alloy to continuous casting, subjecting the rolled sheet to warm leveling, and coiling the worked sheet in a cylindrical shape while the temperature just before coiling is decreased to 100&#xb0; C. or less.

Magnesium alloy coil stock

A magnesium alloy sheet having good press formability, a magnesium alloy structural member produced by pressing the sheet, and a method for producing a magnesium alloy sheet are provided. The magnesium alloy sheet is composed of a magnesium alloy containing Al and Mn. When a region from a surface of the alloy sheet to 30% of the thickness of the alloy sheet in a thickness direction of the magnesium alloy sheet is defined as a surface region and when a 200 &#x3bc;msub-region is arbitrarily selected from this surface region, the number precipitated impurity grains containing both Al and Mg and having a maximum diameter of 0.5 to 5 &#x3bc;m is 5 or less. When a 50 &#x3bc;msub-region is arbitrarily selected from the surface region, the number of crystallized impurity grains containing both Al and Mn and having a maximum diameter of 0.1 to 1 &#x3bc;m is 15 or less. In the grains of the crystallized phases, the mass ratio Al/Mn of Al to Mn is 2 to 5. The magnesium alloy sheet has good press formability since the crystallized phases and precipitates that cause breaking are small in amounts contained and in size.

Magnesium alloy sheet

The method of producing a magnesium alloy joined part has the following steps: a joining step of joining a reinforcing material made of metal to a plate material made of magnesium alloy without allowing an organic material to remain at the joined portion and a plastic-working step of performing plastic working on the plate material to which the reinforcing material is joined. A desirable means of joining the reinforcing material to the plate material can be to use an inorganic adhesive. Because the magnesium alloy joined part is formed by a structure in which the reinforcing material is joined to the plate material, in comparison with the case where the reinforcing material is formed by machining or the like, the magnesium alloy structural member can be obtained with high production efficiency.

Magnesium alloy joined part and production method thereof

A biosensor measurement device for providing accurate measurement results within a short period of time by using only a very small amount of sample. The biosensor measurement device includes a power source, which is connected to a voltage regulator, a measurement instrument, and a controller for supplying power. When the biosensor chip is connected to the biosensor measurement device and a voltage is applied, the measurement instrument begins the measurement of a current value for the biosensor. When the measured current value or a measured charge value is greater than a reference value, the measurement is terminated in accordance with an instruction issued by the controller, and when the value is smaller than the reference value, the measurement is continued in accordance with a controller instruction.

Biosensor measurement machine, biosensor measurement system and biosensor measurement method

In a biosensor system and its measuring instrument which determine that a biosensor chip has been inserted and measure biological information on a biological material supplied to the biosensor chip, the size of the biosensor chip is made small, the reliability of the measuring instrument is improved, and the product life becomes long. In addition, a measurement error of the biological information is suppressed in measuring the biological information by inserting a biosensor chip, which has a sensor electrode formed of an electrode member with an electric resistance value higher than a conductive metal, into the measuring instrument.

Biosensor chip, biosensor system and measuring instrument thereof

Growing community of inventors

Osaka, Japan

Takahiko Kitamura