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603 脳動脈モデル内の流れの研究

横山敬正, 松尾崇, 渡辺紳一, 山本圭治郎

バイオエンジニアリング講演会講演論文集
2004年 2004.16 巻
発行日: 2004/01/21
公開日: 2017/06/19

DOI https://doi.org/10.1299/jsmebio.2004.16.181

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Injection Locked Charge-Pump PLL with a Replica of the Ring Oscillator

Jeonghoon HAN, Masaya MIYAHARA, Akira MATSUZAWA

IEICE Transactions on Electronics
2014年 E97.C 巻 4 号 316-324
発行日: 2014/04/01
公開日: 2014/04/01

DOI https://doi.org/10.1587/transele.E97.C.316

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This paper derives a maximum lock range of an injection locked ring oscillator in a direct injection method and presents an injection locked charge-pump phase-locked loop (CPPLL) with a replica of a ring oscillator. The proposed injection-locked PLL separates the injection-locked VCO from the continuous phase-tracking loop of the PLL such that can provide stable lock-state maintenance and tolerance to temperature and supply voltage variation. The measurement results show that the proposed injection-locked PLL can be tolerable to voltage variation of 11.2% in supply voltage of 1.2V. In-band noises of the injection-locked oscillator at offset frequencies of 10kHz and 100kHz are -108.2dBc/Hz and -114.6dBc/Hz, respectively.
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A NEW CORRELATION FOR PRESSURE DROP OF PACKED COLUMN

TERUO TAKAHASHI, YASUHARU AKAGI, KATSUKI UEYAMA

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN
1979年 12 巻 5 号 341-346
発行日: 1979/10/20
公開日: 2006/04/03

DOI https://doi.org/10.1252/jcej.12.341

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By the use of the experimental data of many previous studies, a new correlation for the pressure drop of a packed column was obtained in this work. The total pressure drop is expressed as the sum of the dry pressure drop and the wet pressure drop. The dry pressure drop originates mainly from the friction of gas rising through the void of the packed bed, and is expressed by the Fanning equation. The wet pressure drop originates from the increase in net gas velocity because of the smaller void of the packed bed owing to the liquid holdup, and therefore it is expressed as a function of liquid holdup, gas velocity, etc. The liquid holdup consists of static and dynamic holdups, and is correlated separately.
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日本産コナラ属とその近縁種の材化石の再検討

鈴木三男, 大場秀章

植物研究雑誌
1991年 66 巻 5 号 255-274
発行日: 1991/10/20
公開日: 2022/10/20

DOI https://doi.org/10.51033/jjapbot.66_5_8620

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べンゾイミダゾールによる銅の腐食抑制の分光学的研究

戸部均, 森戸延行, 門間清, 末高洽

日本金属学会誌
1974年 38 巻 8 号 770-776
発行日: 1974年
公開日: 2008/04/04

DOI https://doi.org/10.2320/jinstmet1952.38.8_770

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The corrosion inhibition of copper by benzimidazole (Bzd) was investigated by means of infrared and visible absorption spectroscopy and polarization measurement. The polarization curve of copper electrode in 3% NaCl aqueous solutions with or without Bzd indicated that in neutral solutions Bzd acted as an effective corrosion inhibitor for copper. The infrared spectra of the surface film formed on copper surface in neutral solutions showed that the film consisted of bis(benzimidazolato)copper(II) polymer. The use of polarized beam revealed that the film was compact and adherent to the metal surface, suggesting that the inhibition is due mainly to the formation of a protective polymer film.
The film formed on the copper surface in slightly acidic (pH: 5.0) solutions was porous and not adherent to the metal surface, yielding poor inhibition of corrosion. The spectra of the porous film showed that the film did not consist of bis(benzimidazolato)copper(II) polymer, but contained copper(II) ions having neutral Bzd molecules as ligands.
Benzotriazole is an effective corrosion inhibitor for copper also in weakly acidic solutions in which Bzd plays as a poor inhibitor. The superiority of benzotriazole as inhibitor over Bzd can probably be ascribed to the acidity of the former which is stronger than that of the latter. Benzotriazole, owing to its stronger acidity, produces a protective film of a copper complex polymer also in acidic solutions where Bzd dose not.
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カーボンナノチューブ探針を用いた高アスペクト比ナノスケール穴加工法の開発

－単層カーボンナノチューブ探針の作製と高配向焼結グラファイトの加工－

有馬則和, 荻原隆志, 金森晃宏, 松室昭仁

精密工学会誌論文集
2006年 72 巻 1 号 116-120
発行日: 2006/01/05
公開日: 2012/01/13

DOI https://doi.org/10.2493/jspe.72.116

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We developed a fabrication method for high-aspect-ratio nanoscale pits 60 nm in diameter by using a multi-wall carbon nanotube (MWNT) as a scanning tunneling microscope probe. We used a single-wall carbon nanotube (SWNT) to fabricate a pit whose diameter is in the single nanometers. We investigated the application the pull-method to SWNT probe manufacturing, under various manufacturing conditions. In addition, we investigated the relationship between the diameter of carbon nanotube (CNT) and fabricated pit in order to determine the diameter of a pit fabricated using a SWNT probe of the minimum diameter. The nanoscale pits were produced in highly oriented pyrolytic graphite. SWNT probes were synthesized using a mixed dispersion liquid with both MWNT and SWNT. SWNTs were attached to the apex of the MWNT in this process. The success rate for synthesis was about 17 %. CNT probes 7, 10 and 40 nm in diameter used under the conditions of a bias voltage of 4 V, tunnel current of 1 nA and fabrication time of 180 s, yielded fabricated pits with the respective diameters of 9, 14 and 45 nm. From the results, it is thought that a fabricated pit is 2 nm greater in diameter than the CNT that fabricates it. If a SWNT that is 0.4 nm in diameter, the minimum diameter, is used in this fabrication method, the diameter of the fabricated pit is expected to be 2.4 nm. This demonstrates that STM fabrication using CNT probes can be useful in fabricating single nanoscale structures by controlling the diameter of the CNT.
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NOV Liquid Soap D^®貼付試験成績

中山秀夫, 生冨公明

西日本皮膚科
1992年 54 巻 1 号 153-157
発行日: 1992/02/01
公開日: 2011/09/29

DOI https://doi.org/10.2336/nishinihonhifu.54.153

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事実上接触アレルゲンを含まないNOV-liquid soap D^®と, 現在よく市販されているAボディーシャンプー, Bボディーシャンプーをいずれも各1%aqの条件で2日間閉鎖貼付試験を行った。ICDRG基準で(++)反応はNOV-liquid soap D^®にはなく, (+)は69例の湿疹, 皮膚炎患者中2例(2.9%)にみられた。陰性率は94.2%で, これはA, B両ボディーシャンプーの共に84.1%よりもすぐれていた。これは抗原零とした結果で, 誘発率が低く抑えられている可能性がある。
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XAFSによる高分子材料表面の解析

岡島敏浩

表面科学
2002年 23 巻 6 号 359-366
発行日: 2002/06/10
公開日: 2008/08/28

DOI https://doi.org/10.1380/jsssj.23.359

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Chemical bonding at polymer surface is an important factor because it relates to the fundamental properties of polymers such as wettability and adhesion specially in industrial applications. In this study, NEXAFS (Near Edge X-ray Absorption Fine Structure) spectroscopy using synchrotron radiation was applied to the characterization of polymer surfaces. The spectrum provided a good deal of information related to chemical bond that is difficult to obtain by X-ray photoelectron spectroscopy. The usefulness of NEXAFS spectroscopy as a method of polymer surfaces characterization is demonstrated.
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反発する磁石の漏れ磁束を利用したウェアラブル触覚提示素子

真鍋光希, 牛山奎悟, 髙橋哲史, 梶本裕之

日本バーチャルリアリティ学会論文誌
2023年 28 巻 4 号 361-370
発行日: 2023年
公開日: 2023/12/27

DOI https://doi.org/10.18974/tvrsj.28.4_361

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This study proposes a new haptic transducer capable of producing strong vibrations and constant skin stretch using repulsive permanent magnets and a small coil. The repulsive magnet configuration generates a concentrating leakage magnetic flux on the side surface of the magnets directing perpendicular to the surface. Both the magnets and the coils are attached to the skin to generate constant force as well as vibration. To demonstrate the effectiveness of the proposed method, we fabricated and evaluated a prototype. As a result, it was found that the proposed method is able to present vibrations with larger amplitudes than existing methods. It was also suggested that the proposed method is superior to the existing method in representing the shape and texture of virtual objects.

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