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  • 佐藤 次雄, 白杵 一幸, 後藤 幸弘, 奥脇 昭嗣
    日本化学会誌(化学と工業化学)
    1991年 1991 巻 10 号 1432-1437
    発行日: 1991/10/10
    公開日: 2011/05/30
    ジャーナル フリー
    液体アンモニア中にアルミニウムペレットを充填し,液体アンモニア温度0~130℃,放電電圧2 .5~11kV,放電サイクル1~2/sで火花放電反応を行わせることにより,結晶子径29~43nm,平均凝集粒径4.5~8.7μmの窒化アルミニウム粉末が得られた。生成粉末中にはAINとともにA1が含まれ,単一相AINの直接合成はできながった。なお,液体アンモニア温度の上昇および出発原料として用いるアルミニウムペレットの粒径の減少により,AIN含有率が増加し,AIN粒径が減少した。粉末を900~1200℃ の窒素雰囲気でか焼することにより,AIの溶融による粉末の凝結を起こすことなく粉末中のAlを窒化することができた。
  • 金子 泰成, 松元 義隆, 岩崎 弘通, 西田 稔, 毛利 彰宏, 千葉 昂
    材料
    1990年 39 巻 445 号 1347-1352
    発行日: 1990/10/15
    公開日: 2009/06/03
    ジャーナル フリー
    Synthesis of AlN whiskers from Al powders obtained by a spark discharged process and their morphology were studied. AlN whiskers were synthesized by nitridation of the compositions in the Al-C system in N2-gas flow at 1450°C for 24 hours. Morphological aspects of the whiskers were observed by a scanning and a transmission electron microscopes. Al powders obtained by the spark discharged process were covered with a thin layer of hydroxide and did not melt nor coalesce up to 1000°C in air. Morphologies of the synthesized whiskers were divided into three types; two single filament types and one bicrystal type. Both of the single filament whiskers had ‹0001› growth direction. The growth direction of the latter type deviated about 13 degrees from ‹0001› axis. All the whiskers were thin plate-like. The internal defect of whiskers was also described.
  • 本田 英昌, 豊田 貞治, 広瀬 保男
    燃料協会誌
    1956年 35 巻 9 号 526-536
    発行日: 1956/08/20
    公開日: 2011/10/21
    ジャーナル フリー
    鉄鉱石の分析にはこれまで化学分析が使用されてきたが,鉄鉱石中の成分としてマグネタイト.酸化第一鉄.酸化第二鉄が混合して存在すると,化学分析より求めたFe++,Fe+++の重量%は,各成分のFe++,Fe+++の重量%の総和として求められる。故にこのままでは各成分の重量%は,化学分析より求められない。もし他の方法でどれか一成分を定量すれば,残りの二成分を計算で出すことができる。この報告では磁気測定により,独立にマグネタイトの定量をし,それから酸化第一鉄,酸化第二鉄を算出した。他の磁性物質として,金属鉄が含まれていないことは化学分析によりたしかめた。つぎに還元により生じた鉄鉱石中の金属鉄の量も,磁気測定によりかんたんに定量することができる。ての場合は他の磁性物質たとえばマグネタイトが存在しないことが,必要條件になるが,還元により金属鉄が生じた鉱石の化学分析をするとFe+++はほとんどなくマグネタイトの存在は認められなかつた。結局この磁気測定による分析方法と化学分析とを併用すると酸化第一鉄,マグネタイト,酸化第二鉄,金属鉄の分析ができるので,鉄鉱石の還元反応の進行状態を明示することができる。
  • Zrへの応用
    佐野 利夫, 田渕 光春, 金子 泰成
    粉体および粉末冶金
    1991年 38 巻 6 号 707-711
    発行日: 1991/08/25
    公開日: 2009/05/22
    ジャーナル フリー
    Powder preparation by using spark discharge between zirconium rotating disk electrode and wire electrode in liquid nitrogen and in deionized water were studied.
    Zirconium and zirconium nitride (ZrN) powders containing spherical and irregular shape particles were obtained in the case of liquid nitrogen. By applying deionized water instead of liquid nitrogen, spherical particles containing zirconium and zirconium oxide (ZrO2, monoclinic) powder were formed.
    Spherical particles were formed by drop splashing from melting zone on electrodes. Irregular shape particles were formed by spalling from nitrized zone on electrodes.
  • 熊田 淳一, 亀谷 寿彦
    日本人工臓器学会雑誌
    1969年 6 巻 1 号 94-95
    発行日: 1969/08/31
    公開日: 2011/09/05
    ジャーナル フリー
  • 石橋 渡
    粉体および粉末冶金
    1977年 24 巻 4 号 113-117
    発行日: 1977/06/05
    公開日: 2009/05/22
    ジャーナル フリー
    When a spark discharge takes place at the contact points of pellets (metal, alloy or graphite) dipped in the liquid medium (pure water or oil), the powder produced from the pellets reacts with the medium at the spark points.
    This paper describes stoichiometrically the reaction between the powder and the liquid medium at the spark points by means of mass balance being based on the quantity of the cracked medium, the quantity of gas and powder produced, composition of gas, and the property of powder.
    The results are summarized as follows:
    1) WC-Co powder produced at the spark points reacted with water and 36.2% of carbon in WC-Co powder was changed into CO2 and CO gases by dicarburization while metallic components were partially oxidized.
    2) The Aluminum powder reacted with OH-radical and formed Al(OH)3. The reaction took place in short supply of OH-radical by 20.1 % for its theoretical weight at the spark points.
    3) The Tungsten Carbide was decarburized by its autolysis at the spark points in the oil medium. 11.4% of carbon was decarburized.
  • 石橋 渡
    粉体および粉末冶金
    1977年 24 巻 4 号 107-112
    発行日: 1977/06/05
    公開日: 2009/05/22
    ジャーナル フリー
    As an application of electrode erosion by electric discharge, a new method was developed in which fine powder was produced by the spark discharge.
    When metal pellets are dipped into the liquid medium, the contact points of each pellets form the spark points. The pellets repel momentarilly each other by the impulse of spark discharge, and maintain its steady spark discharge by shifting the contact points and inhibiting the conversion to arc discharge. Thus fine powder is produced at spark points.
    In spark discharge circuit, electrostatic capacity of condenser is set as small as possible, and enhances the condenser energy by higher charge voltage. In addition, the discharge voltage is brought to be higher by quenched spark gap.
    The powder quantity is increased with the higher discharge voltage (10-40 kV) and its particle size becomes smaller with increase of frequency (230-610 kHz). Discharge condition has been investigated for producing fine powder (0.05-5μm) from aluminum, copper and iron materials. Finally the theoretical description has been given with regard to the mechanism of producing the fine powder at spark points.
  • 清成 要平
    日本内分泌学会雑誌
    1928年 4 巻 8 号 1431-1456,61
    発行日: 1928/11/20
    公開日: 2012/09/24
    ジャーナル フリー
    In order to learn the influence of various ductless glands upon the thymus gland, the removal of thyroid, gonads and suprarenals and the feeding of gonads and suprarenal cortex were carried out in young rats.
    Throughout the whole experiments, the non-operated animals of the same litters served as controls.
    The results were summarized as follows :
    1) Gonadectomy or suprarenalectomy not only delays the involution of thymus, but also causes its hyperplasia in both males and females, while thyroidectomy seems to exert no direct effect upon thyrnus.
    2) In comparison with thyroidectomy alone, gonadectomy thyroidectomy causes a more remarkable hyperplasia of thymus.
    3) The combined effect of gonadectomy and suprarenalectomy is greater than that of either one.
    4) The feeding of gonads or suprarenal cortex in normal or thyroidectomized rats accelerates thymic involution in most cases.
    5) From the above mentioned data, it may be concluded that gonads and suprarenal cortex play a more important role for the involution and hyperplasia of thymus than thyroid and that hyper-resp. hypofunction of both glands causes involution resp. hyperplasia of thymus.
  • 第4報 新型摩耗試驗機の試作
    内田 豐作, 石橋 渡, 中里 博明
    繊維学会誌
    1953年 9 巻 1 号 25-28
    発行日: 1953/01/30
    公開日: 2008/06/30
    ジャーナル フリー
  • 國枝 溥
    日本水産学会誌
    1949年 14 巻 4 号 189-195
    発行日: 1949/02/25
    公開日: 2008/02/29
    ジャーナル フリー
    There are many kinds of forms in Carassius of Far East. From the standpoint of the evolution of the myodomes, two types can clearly be recognized. The one is the flat-type which the author calls “Hirabuna” and the other is the round-type. which is called “Maru-buna”. These two types can distinctly be separated by their morphology of the parasphenoids. The flat-type is more primitive than the round-type from the standpoint of the structure and development of the myodomes. If the parasphenoid of the flat-type is the same morphologically as that of Carassius carassius of Europe, the same scientific name should be given to the species of the flat-type.
    As the structure of the parasphenoid of the goldfish is about the same as that of the round-type, it is certain that the former has close relationship with the latter. Therefore, the species of the round-type should be called Carassius auralus which is the scientific name of the goldfish. In Ryukin it is found that each centrum of the vertebrae is only half as long as that of Carassius. Therefore, Ryukin has been stunted in development, resulting in a short form which should be named a dwarf. A species of Carassius from the river of Tam-sui in Formosa has also an abnormal backbone of which length is an intermediate between the backbone of Carassius and that of Ryukin. Therefore, it should be called a semi-dwarf.
  • 燃料協会誌
    1955年 34 巻 5 号 310-311
    発行日: 1955/05/20
    公開日: 2010/06/28
    ジャーナル フリー
  • 第2報 計数管式リジリエンスメータ
    白樫 侃, 石川 欣造, 石橋 渡, 渋沢 達也
    繊維学会誌
    1959年 15 巻 11 号 863-867
    発行日: 1959/11/10
    公開日: 2008/11/28
    ジャーナル フリー
    An apparatus, which integrates energy of load-deformation by dekatron (counting tube) system is described. The load, which is applied to a magnetostriction type strain gauge, can be transformed into voltage. The rectified output A. C. voltage is applied to the grid of the reactance tube. This reactance tube is a part of the oscillator. The input voltage changes to frequency in proportion to that voltage. The frequency is converted to pulse and is integrated by dekatron. Without confining to small deformation as for the dynamic oscillation measurements of various types of textiles, the hysteresis, resilience, and toughness of large deformation from repeated elongation can be measured by this resilience meter.
  • 石川 欣造, 石橋 渡
    繊維学会誌
    1954年 10 巻 2 号 81-85
    発行日: 1954/02/10
    公開日: 2008/11/28
    ジャーナル フリー
  • 淺岡 信壽, 石橋 渡
    燃料協会誌
    1950年 29 巻 5-6 号 117-120
    発行日: 1950/06/28
    公開日: 2010/06/28
    ジャーナル フリー
    亜炭から分別した比重を異にする各部分の示性分析結果によると, 低比重の部分に所謂木質構造が集約されて居り, この部分から乾溜及び水蒸氣賦活の方法で作つた活性炭は高比重の部分から作つた活性炭に比較して吸着度がはるかにすぐれて居た。又木質亜炭と炭質亜炭から作つた活性炭の吸着度を比較すると, 木質亜炭が炭質亜炭よりすぐれて居ることがわかつた。結局亜炭から良質の活性炭を製造するには先づ原料として所謂木質構造に富む部分を選ぶ必要がある。
  • 石川 欣造, 石橋 渡
    繊維学会誌
    1953年 9 巻 6 号 298-302
    発行日: 1953/06/10
    公開日: 2008/06/30
    ジャーナル フリー
  • 第3報 合成繊維タイヤコードについての2, 3の測定
    白樫 侃, 石川 欣造, 中島 伸浩, 久須木 速男
    繊維学会誌
    1959年 15 巻 12 号 985-991
    発行日: 1959/12/10
    公開日: 2008/11/28
    ジャーナル フリー
    By combining an 8mm movie camera with the counting tube resilince meter, the energy loss per cycle of of nylon, Terylene, and rayon yarns and cords are measured at the neighbourhood of initial severel cycles, 10, 100, 500 and 1000 cycles. The strains are 1% and 3%. The applied strain is of constant rate of deformation type, while the speed is cycle per second. The results are obtained as follows.
    1. Except Terylene, others show decrease of hysteresis loss with an increase of repeated number of elongation. The decrease is rapid at 2_??_3 cycles, and if the repeated number of cycles are converted to logarithm, this may be shown by an approximate straight line. At severel cycles, the fibers and cords are stabilized considerably.
    2. With the increase of temperature, the hystersis loss decreases in the case of nylon and this is in opposite to the result, derived by Wakeham. As the effect of humidity is large in rayon, the result is not definite, due to its mutual effect with temperature. Terylene showed a little decrease with the increase of temperature.
    3. Comparing the stabilized and unstabilized nylon cords, the effect of stabilization is low at 1% of strain, but at 3% the property of recovery is high in the case of treated cord. The treated cord is also stable in respect to the change of temperature.
    4. The minimum point of the hysteresis loss of Terylene appears at 2_??_3 cycles. This is explained as due to the change in the internal structure.
    5. Though the effect of twist is complicated due to the change of strain for twisting and the friction with inter fibers, the decrease of hysteresis loss is observed as nylon twisting is increased. This change in rayon is complicated.
  • 照井 秋生, 石橋 渡, 笹岡 治郎, 加藤 勉, 佐久間 精一, 加藤 仁久, 平沢 信三
    工業化学雑誌
    1959年 62 巻 11 号 1670-1673
    発行日: 1959/11/05
    公開日: 2011/09/02
    ジャーナル フリー
    本研究は中間試験プラントによりブタンおよびペンタン留分をタ外ン熱留式流分動を接外触熱分式解流によ動り接変触成分す解るにことよにりよ変っ成て都す市るガことによって都市ガス工業へ利用し,またはオレフィンガスその他を製造することを目的とした。その結果石炭類の半成コークスは他の触媒と比較して原料と水蒸気との反応にすぐれた接触能力を示した。この際石炭類の半成コークス触媒は4時間の連続使用で5~8%減少したが,その間変成成績には変動が認められなかった。また流動層上方空隙部を冷却することが生成ガス中の不飽和炭化水素の重合,縮合反応などによるタールの生成および生成水素の再水添反応を防止して,変成効率を向上させるのに有効である。
    またブタンよりペンタン留分の方が分解され易く,良好な変成成績が得られた。その他工業化のための基礎資料を得た。
  • 田渕 光春, 金子 泰成, 岩崎 弘通
    Journal of the Ceramic Society of Japan (日本セラミックス協会学術論文誌)
    1990年 98 巻 1144 号 1296-1301
    発行日: 1990/12/01
    公開日: 2010/08/06
    ジャーナル フリー
    Titanium nitride powders were synthesized using the spark discharge between titanium electrodes in a liquid nitrogen. The powders were presumed to be the nitrogen defective titanium nitrides by X-ray diffraction and nitrogen analysis. There were irregular shape particles beyond 100μm, spherical particles below 40μm and ultra fine particles below 40nm in the powders. It was suggested that irregular shape and spherical particles were formed of solidified titanium nitride of electrode couples and molten titanium containing nitrogen in discharge point respectively, and that ultra fine particles were formed by gas phase reaction of titanium with nitrogen particularly.
  • 酒井 久裕, 落合 鍾一, 上野 學
    鉄と鋼
    1989年 75 巻 4 号 657-664
    発行日: 1989/04/01
    公開日: 2009/06/19
    ジャーナル フリー
    The purpose of this work is to present results on the mechanical properties of SUJ 2 bearing steel improved by a cyclic heat treatment. The structure of thermally cycled steel consists of fine-grained ferrite particles of the size under about 2 μm containing fine cementite particles of the size about 0.2μm. Thermally cycled steel was found to be superplastic at 710°C, just below A1 temperature, at an initial strain rate of 1.67 × 10 -4s -1, i.e. elongation to failure was about 500% and the strain rate sensitivity, m value, was about 0.4. The activation energy of about 180 kJ/mol, which is nearly equal to that of grain boundary diffusion of Fe atoms in α-iron, was obtained for this plastic deformation.
    Furthermore the rolling contact fatigue life test was performed at room temperature under constant load. The fatigue life of SUJ 2 steel thermally cycled was found to be prolonged (about 2.5 times) as compared with that of conventional one.
  • 辻井 剛, 宮代 裕, 箟 源亮, 吉川 英一, 田中 宏, 加藤 洋治, 小林 敏雄, 永野 進, 吉田 豊明
    可視化情報学会誌
    2002年 22 巻 2Supplement 号 1-10
    発行日: 2003/02/01
    公開日: 2010/11/19
    ジャーナル フリー
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