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70 巻, 794 号
選択された号の論文の8件中1～8を表示しています
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厚母 庸二1954 年 70 巻 794 号 p. 337-342
発行日: 1954/08/25
公開日: 2011/07/13
ジャーナル フリーIt is a fact that rock drillng is a highly important operation occupying practiclly all the space in the field of mining but it is far from satisfaction and one cannot stop thinking that the systematic study on this is in a childish stage as there are still some problems left in the study on the physical analysis of rocks.
In the following papers, the writer has. first of all, defined the hardness of rocks using the apparatus devised by himself which is the first of its kind and has adopted the said hardness as a scale to show the degree of resistance in rock drilling. The writer has then made a careful stgdy into the relation between the hardness defined by hims elf and that obtained in actual operation as well as the relation with the various natures of rocks and finally, he hasdiscovered that the observation, taking into account of the void, will bring about a still more favourable result.抄録全体を表示PDF形式でダウンロード (5385K) -
堀部 富男1954 年 70 巻 794 号 p. 343-346
発行日: 1954/08/25
公開日: 2011/07/13
ジャーナル フリーThe sand was brought from Hirose River and was used to make samples in this experiment. The samples of this sand, containing 32.5% of water, were made in cylindrical forms in the vessel, and cooled in the liquid N2 or in cryogens. Then their tensile and compressive strengths were examined.
As results, those strengths were increased as the decrease of the temperature.抄録全体を表示PDF形式でダウンロード (789K) -
佐々木 和郎, 阿部 秀夫, 加藤 眞蔵1954 年 70 巻 794 号 p. 347-351
発行日: 1954/08/25
公開日: 2011/07/13
ジャーナル フリーA. study of testing the strength of sand slime filling, which undergoes changes owing to its size and moisture content, was performed in using the methods of shearing, consolidating and, loading tests in our laboratory and also the loading tests only at Hitachi Mine.
Under a condition where the slime contents less than a certain amount of moisture, the finer grains of sand slime resists more against shearing and carries more loading. Under the contrary condition these relations are shown adveresly.
Experimenting the sand slime on the loading platform with 17.5cm diameter, the filling remalins stable, provided that the settling depth of the platform indicates less than 10cm under 5.2kg/cm2 loading.抄録全体を表示PDF形式でダウンロード (808K) -
田中 正男, 山崎 豊彦1954 年 70 巻 794 号 p. 353-357
発行日: 1954/08/25
公開日: 2011/07/13
ジャーナル フリーIt goes without saying that it is necessary to find out the original source of spontaneous combustion when it occurred in coal seams.
Up to the present, however the method of detecting the source of spontaneous combustion was left aside in the field of its.study.
In this paper, the writers stated the existence of spontaneous combustion might be simply determined by the obserbation of temperature distribution on coal surfaces, from which results the isothermal line as well as the temperature distribution curve would be obtained, on which basis the formula κ-Δκ=√Δκ2+η2-Δκ was reduced for locating the source of spontaneous combustion in distance from the surface of coal seams.抄録全体を表示PDF形式でダウンロード (835K) -
閃亞鉛鉱の浮游選鉱の基礎的研究 (2)佐藤 亮一郎1954 年 70 巻 794 号 p. 359-363
発行日: 1954/08/25
公開日: 2011/07/13
ジャーナル フリーIn order to throw light upon the mechanism of activation of sphalerite in flotation, electron diffraction investigations of the actions of a variety of aqueous heavy metal salts on sphalerite and galena cleavage faces were carried out. The obtained results were compared. with the simple prevailing theory, which is based on solubility relation between metal sulphides and on metathetical reaction between mineral and solution. It was shown that the simple theory is not always tenable. In addition, the action of KEX on the sphalerite and galena cleavage faces pre-conditioned by heavy metal salts was also studied.抄録全体を表示PDF形式でダウンロード (7446K) -
伊藤 尚1954 年 70 巻 794 号 p. 365-368
発行日: 1954/08/25
公開日: 2011/07/13
ジャーナル フリーGallium is a rare element which is distributed widely. The author found the zinc residue which contained appreciable amount of Gallium. Treating 1kg of this residue, 0.63g of metallic Gallium was obtained. In this paper, the extracting process used and the various facts which were met with in the process are briefly described.抄録全体を表示PDF形式でダウンロード (745K) -
山本 勇次1954 年 70 巻 794 号 p. 369-372
発行日: 1954/08/25
公開日: 2011/07/13
ジャーナル フリーPDF形式でダウンロード (807K) -
1954 年 70 巻 794 号 p. 373-384
発行日: 1954/08/25
公開日: 2011/07/13
ジャーナル フリーPDF形式でダウンロード (5666K)
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