著者

大西 巖 延原 久雄 上田 陽

出版者

一般社団法人 溶接学会

雑誌

溶接学会誌 (ISSN:00214787)

巻号頁・発行日

vol.25, no.2, pp.76-81, 1956

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Some deposit metals were made on the mild steel plate and high carbon steel block by A. C arc welding process. Several types of coated electrodes showed in Tablel were used.<BR>Manganese and carbon contents of the deposit made by electrode B were not enough as an austenitic manganese steel. But concerning to the hardness distribution, it was more homogeneous than that of deposit made by electrode A. The microstructures of bottom parts of these deposits adjacent to the mother metal were consist of martensite, sorbite or fine pearlite. Cracks oftenly occured in these parts. Sometimes these crack tendensies were seen at the bottom of the single bead deposited by electrode D or E. But multiplying the deposit three layers or more with electrode D or E, dilution effect by mother metal could be avoided, chemical compositions and (micro structures) of deposit became ideal as the anstenitic high manganese steel.<BR>The single layered bead made by electrode F or C had an anstenitic structure in spite of the dilution by mother metal and cracks at the bottom of the bead seldom occured. But in multilayered deposit cracks occured along dendritic structure oftenly. For these cracks the precipitation of super saturated carbon and the red shortness of the anstenitic manganese steel were considered to be important causes.<BR>The practical manipulation of the electrode became harder with increasing nanganese in electrode core and it's coating. Electrode for single layer use only, therefore, higher manganese content as far as possible to keep the good operating quality is desirable. Electrode such as D and E were suitable to the multi layers uses.<BR>In addition, allowable lover welding current and shorter arc length with constant travelling speed of moderate value were desired in this surfacing.

著者

原 久雄 宮田 光男

出版者

公益社団法人 日本化学会

雑誌

化学と教育 (ISSN:03862151)

巻号頁・発行日

vol.39, no.3, pp.312-315, 1991

著者

榊原 久雄 田辺 巌 江本 雅三

出版者

一般社団法人 日本感染症学会

雑誌

感染症学雑誌 (ISSN:03875911)

巻号頁・発行日

vol.53, no.12, pp.687-693, 1979-12-20 (Released:2011-09-07)

参考文献数

6

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A strain of V. cholerae isolated from a cholera patient found in Kobe was proved to have the following charactristics:1) The strain grew very slowly or was distinctly undergrown on TCBS agar which can well support the growth of V. cholerae organisms generally. It took 36-48 hrs before the formation of visible colonies (1-2 mm in diameter). At earlier stages of growth (about 18 hrs after the beginning of incubation at 37°C), the colonies had greenish tone, instead of yellowish tone as generally shown by the V. cholerae organisms. This was due to the lack of ability of decomposing sucroce. However, after 24 hrs of incubation, the colonies became yellowish. The same statement was made as to the results using peptone water. In general properties, this strain resembled those successively cultivated in peptone water.2) Since there are V. cholerae strains which can grow very slowly on TCBS agar, it is absolutely necessary to use additionally other kinds of selective media, such as alkaline agar or Endo's agar, for the purpose of primary isolation of V. cholerae from natural sources.3) Other characteristics such colony morphology, biochemical activities, sugar decomposition capacities and agglutinability against antiserum, etc. were essentially the same as those of typical V. cholerae. However, no Kappa type phage was isolated. Based on these data, we regarded this strain as classical El Tor vibrio of the continental type.

著者

高山 透 日野谷 重晴 石黒 三岐雄 黒澤 文夫 安原 久雄 源内 規夫 千野 淳 九津見 啓之 儀賀 義勝 助信 豊 内山 雅夫 石井 実

出版者

社団法人日本鉄鋼協会

雑誌

鐵と鋼 : 日本鐡鋼協會々誌 (ISSN:00211575)

巻号頁・発行日

vol.82, no.2, pp.147-152, 1996-02-01

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The method for isolation and determination of TiN and (Ti, Nb)(C, N) precipitated in Nb-Ti bearing steels has been investigated in the cooperative research of the Precipitate Analysis Subcommittee of Iron and Steel Analysis Committee of Iron and Steel Institute of Japan. Also, the precipitation behavior of TiN and (Ti, Nb)(C, N) in the steels has been studied. The results are summarized as follows ; (1) TiN, (Ti, Nb)(C, N) and other precipitates were extracted by potentiostatic or galvanostatic electrolysis in 10% acetylacetone-1% tetramethylammonium chloride-methanol electrolyte. (2) Only the TiN in the above mentioned precipitates was insoluble and remained by 60℃-10% bromine-methanol solution treatment. Consequently, the amount and composition of TiN and (Ti, Nb)(C, N) could be determined quantitatively by analysis of the residues extracted by using the method of (1) and the residues after this treatment. (3) The size of TiN was several micrometers, the amount of TiN did not change with heating temperatures between 1000 and 1250℃, and the atomic ratio of Ti to N was stoichiometrically one to one. (4) Total amount of Ti and Nb in the precipitates decreased with an increase in heating temperature, because the small size of (Ti, Nb)(C, N) dissolved. (5) Both lattice constant and composition changes in (Ti, Nb)(C, N) showed that Nb and C dissolved preferably into the matrix and the composition of the precipitates approached to that of TiN with an increase in heating temperature. (6) Such behavior of precipitates agreed well with rough calculation from the solubility products.