著者

太田 裕也 山崎 拓海 太田 尚志 佐々木 洋

出版者

石巻専修大学

雑誌

石巻専修大学研究紀要 (ISSN:09158715)

巻号頁・発行日

no.18, pp.33-40, 2007-01

---

Faecal pellets (FP) produced by crustacean zooplankton in the epipelagic zone have been considered to sink down to deep layers because of their fast sinking velocity (>>10m d^<-1>). On the contrary, recent laboratory and field studies suggested that sinking faecal pellets were rapidly lost in and below the epipelagic layers, and one of the most likely processes can be omnivorous feeding behaviors of copepods, called as coprophagy, coprorhexy and coprochaly. This study showed feeding behaviors of benthic copepods Tigriopus sp. (Harpacticoidae) on freshly produced faecal material produced by fishes and bivalves observed using a digital video camera with a dissecting and an inverted microscope. Fish faecal material larger than Tigriopus sp. (fragmented into 3-4mm pieces) were often directly ingested and frequently fragmented into small particles by copepods. Unexpectedly high production rates of faecal pellets of 4.7h^<-1> and 5.2h^<-1> were observed for fish and bivalve faecal material, respectively. The higher ration with coprophagy than that with herbivorous feeding may be explained by superfluous feeding of Tigriopus sp. on less nutritious faecal material.

著者

鳥居 一雄 浅賀 質 山崎 拓

出版者

公益社団法人 日本化学会

雑誌

工業化学雑誌 (ISSN:00232734)

巻号頁・発行日

vol.72, no.3, pp.664-666, 1969-03-05 (Released:2011-09-02)

参考文献数

1

---

1N塩酸溶液あるいは1N塩化ナトリウム溶液で処理した天然モルデン沸石をカラム充てん剤として用い,アルゴン,窒素,メタンおよび一酸化炭素の分離を調べた。塩酸溶液で処理したモルデン沸石を充てんしたカラムを用いることにより,未処理のモルデン沸石カラムで認められたメタンのテーリングを十分押えることができたが,273℃の温度で活性化したものでは一酸化炭素との分離が困難であった。323℃に加熱することにより容易に一酸化炭素と分離されたが,一酸化炭素はシャープなピークが得られなかった。塩化ナトリウム溶液で処理したモルデン沸石カラムは未処理のものとほぼ同じようなクロマトグラムを与えた。モルデン沸石に塩酸溶液処理あるいは塩化ナトリウム溶液処理を行なっても,アルゴンと窒素との分離にはさほどの影響は認められなかった。塩酸処理後,さらに塩化ナトリウム溶液処理をほどこしたモルデン沸石はモレキュラーシープ5Aあるいは13Xに匹敵する分離性およびHETP値を示した。

著者

山崎拓著

出版者

りーぶる出版企画

巻号頁・発行日

1980

著者

山崎 拓

雑誌

デジタルプラクティス (ISSN:21884390)

巻号頁・発行日

vol.7, no.1, pp.12-17, 2016-01-15

---

工作機械は,高速化・高精度・複合化・高機能化とさまざまな進化を遂げてきたが,さらに一段上の生産性の向上を求める場合,物を削って形にしていく加工方法が主流のモノづくりでは限界が見えてきた.工作機械の新たな可能性を開拓すべく,円筒形状,平面,穴,および自由曲面などさまざまな加工が可能な切削型複合加工機に積層造形機能を融合させたハイブリッド複合加工機を開発した.本稿では,ハイブリッド複合加工機の特徴を加工アプリケーション事例とともに紹介し,次世代のモノづくりについての可能性と課題を示す.

著者

松岡 常吉 村上 智志 山崎 拓也 中村 祐二

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

vol.83, no.852, pp.17-00009-17-00009, 2017 (Released:2017-08-25)

参考文献数

29

---

This paper numerically investigated the detail process to appear the asymmetrically spreading flames in narrow channel consisted of combustibles. We have successfully reproduced the transient process to form asymmetrically arranged spreading flame first ever in this work. 2-D, time-dependent mass and energy transport process as well as one-step chemical process in gas-phase is considered. Thick solid combustible plates (PMMA) are placed at both sides, then exactly the same ignition operation is made to initiate symmetrical processes. Pure oxygen is fed into the channel at the fixed rate to promote the spreading. Oxidizer velocity and channel height are varied as numerical parameters in this study. After the forced ignition, the combustibles are pyrolized via one-step reaction to evolve the fuel gas into the gas phase to form the opposed-mode flame spreading. Results show the distinctive three spreading modes (two-symmetric flames spreading, two-asymmetric flames spreading and one flame spreading) and transient process from one to the other mode is successfully simulated, which is hardly achieved in experiment. The asymmetric flame spreading mode appears under the limited combination of channel height and velocity. Moreover the distance between two leading edges of the flame varies depending on the imposed condition. Flow patterns are found to be sinus motion, thus the heated and accelerated oxidizer flow may enhance the reaction in the downstream. In this way, it is suggested that the flowing oxygen is effectively used to burn two fuel slabs. It is obvious that the asymmetrical configuration gives temporary stable condition. To study the details further, systematic study is demanded.