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Volume 119, Issue 12
Displaying 1-7 of 7 articles from this issue
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Takashi Mineta, Yoshiyuki Watanabe, Seiya Kobayashi, Yoichi Haga, Masa ...1999 Volume 119 Issue 12 Pages 615-619
Published: December 01, 1999
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSAn active catheter using silicon multi-link-joint structure has been developed. This catheter has a function of controllable bending motion like a snake by incorporation of distributed shape memory alloy (SMA) coil actuators and restoring silicon springs. The mechanical structure that consists of links and connecting bendable beams was fabricated in silicon wafers by using bulk micromachining technique. This method has an advantage that plural catheters can be fabricated by batch process.View full abstractDownload PDF (3169K) -
Yasunori Matsui, Kazunori Takashima, Shinji Katsura, Akira Mizuno1999 Volume 119 Issue 12 Pages 620-625
Published: December 01, 1999
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSWe have been developing a new method of gene mapping of single chromosomal DNA molecules using magnetic beads. The method includes hybridization of probe DNA to the chromosomal DNA attached to a magnetic beads, purification of the hybridized DNA by a magnet, and elongation of the hybridized molecules using a small magnet controlled by a micromanipulator in existence of 0.1% sodium dodecyl sulfate (SDS). Here, we describe a micromanipulation system using magnetic field for elongation and length measurement of a single DNA molecule. The results in our preliminary experiments suggest usefulness of the systems for gene mapping.View full abstractDownload PDF (4606K) -
Yasufumi Hino, Kiyoshi Toko, Tomomi Nagamori, Akira Kawabata, Hiroshi ...1999 Volume 119 Issue 12 Pages 626-630
Published: December 01, 1999
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSNow many plastic vessels are daily used for package of foods. They are very convenient but there is a problem of safety, which has lately become a subject of special interest. The purpose of the present study is to sensitively and easily measure the amount of polymer in solution using multichannel taste sensor. We used polyvinyl alcohol (PVA) as the polymer sample because it is soluble in water. As a result, we could detect 0.01% PVA solution. This is more sensitive than the detection limit using near infrared radiation (NIR) apparatus.View full abstractDownload PDF (1123K) -
Takeshi Hatsuzawa, Tsuguyo Goto, Toshiaki Oguchi, Masanori Hayase1999 Volume 119 Issue 12 Pages 631-635
Published: December 01, 1999
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSA micro electromechnical element for a novel display device-IDD (Interferometric Display Device)-has been proposed and a plototype device is tested to verify its actuation principle. In the IDD, a Fizeau interferometer is constructed by an SiO2 half mirror and silicon substrate surface. When the mirror gap is controlled by a electrostatic force to adjust the optical path difference between two mirrors, the contrast can be changed by the interference in the Fizeau interferometer. A plototype device with 100μm square mirror is driven by a dc voltage up to 50V, resulting in a circular interferometric fringe movement observed by an optical microscope. Step responses less than 100Hz are also examined by using a laser light source.View full abstractDownload PDF (3919K) -
Yasushi Yamada, Yoshiki Seno, Yumi Masuoka, Katsuji Yamashita1999 Volume 119 Issue 12 Pages 636-640
Published: December 01, 1999
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSThe rutile-type TiO2 thin film doped with pentavalent additives such as Nb or Ta, prepared by a multi-target sputtering system, exhibited fairly good NO2 sensing characteristics over the range from 0 to 300ppm at 600°C. According to the Arrhenius plots between conductivity and reciprocal temperature, it seems that the doped Nb or Ta formed some impurity energy level in the forbidden band of TiO2, while V-doped film showed different conducting mechanism. In addition, high-temperature durability in oxydative and reductive exhaust gases was confirmed at 800°C.View full abstractDownload PDF (1214K) -
Shoji Takeuchi, Isao Shimoyama1999 Volume 119 Issue 12 Pages 641-647
Published: December 01, 1999
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSA microelectrode, with clipping structure for insect neural recording, was designed and fabricated by using a Shape Memory Alloy (SMA) thin film. The SMA thin films (TiNi: Titanium Nickel) are deposited by using RF magnetron sputtering and patterned by HF-HNO3 wet etching. The transformation temperatures of the SMA thin films are measured at 54°C (A*) and 50°C (M*). The SMA microelectrode consists of one clipping structure (720μm × 480μm) and two probes (600μm × 70μm). The desired threedimensional shape is given to the electrode by a bonded wire. The SMA microelectrode can clip a nerve cord tightly, and neural activity from a living insect has been successfully recorded with this SMA microelectrode.View full abstractDownload PDF (6031K) -
Yoshio MITA, Dominique COLLARD, Makoto MITA, Hiroyuki FUJITA1999 Volume 119 Issue 12 Pages 648-649
Published: December 01, 1999
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSA Scratch-Drive-Actuator array is fabricated in an inverted way. According to the applied square wave of ±90V from 100Hz to 100kHz, the inverted SDAs successfully conveyed an object placed on it to the designed direction. Since SDA is a microactuator with several ten μN of force and several ten nm of actuation step, the inverted SDA will be a key device of precise, powerful conveyance system over a large area.View full abstractDownload PDF (1417K)
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