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91 巻, 1044 号
選択された号の論文の6件中1～6を表示しています
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速水 博秀, 三沢 茂夫, 厨川 道雄, 高岡 三郎1975 年 91 巻 1044 号 p. 55-59
発行日: 1975/02/25
公開日: 2011/07/13
ジャーナル フリーThe authors analyzed the frictional resistance acting on a cutting tool during rock cutting.The friction coefficient obtained was about 0.55 on the worn part of the clearance face and was in the range of 0-0.19 on the rake face.
We showed that the experimental result of the resultant force acting on the rake face agreed well with the theoretical predictions by Nishimatsu, and analyzed theoretically the resultant force on the worn part of the clearance face assuming the stress distribution on the contacting surface between the worn part of the clearance face and rock.
According to the results obtained, the resultant force acting on the worn part of clearance face is as important as that on the rake face and cannot be neglected especially when the cutting tool which has a worn part on its clearance face is used,
The theory developed here was considered in a plane state.If we make a strict comparison of the experimental results with the predictions, we must carry out the rock cutting test in two dimensional state or develop the theory which can be applied to the rock cutting in three dimensional state.抄録全体を表示PDF形式でダウンロード (1600K) -
渡辺 慶輝, 鈴木 勝, 西松 裕一, 秋山 政雄, 三輪 了1975 年 91 巻 1044 号 p. 61-66
発行日: 1975/02/25
公開日: 2011/07/13
ジャーナル フリーThis paper reports on the principle, design and availability tests of a new developed rock machinability tester.
The main part of this portable tester is set on the rock-bolt which is inserted and fixed into a borehole with depth of nearly 50cm. The rock wall is cut with 3 drag bits fixed on the frame disc which is manually rotated by means of reduction gears and ratchet handle, and advanced along a feed screw.
The thrust component of cutting force is converted to hydraulic pressure to be detected with a Bourdon pressure gage. The indication of pressure gage is used as the index of rock machinability. The tester weighs about 34kg and a test in situ takes only about 45-60 minutes by 3 persons.
The correlation diagram between the efficiency of operation of rock tunnelling machine and the test result with this portable tester is being prepared at present.抄録全体を表示PDF形式でダウンロード (1655K) -
粉粒体の水中沈積物の特性に関する研究 (第1報)広部 良輔, 井上 外志雄, 今泉 常正1975 年 91 巻 1044 号 p. 67-71
発行日: 1975/02/25
公開日: 2011/07/13
ジャーナル フリーRaw materials which are treated in a mineral processing plant, are usually crushed and classified, then become fine particles contained water. These wet fine particles are troublesome for handling. This reports is investigated the characteristics of these fine wet particles.
Fine particles have enormous surface energy, so characteristics are effected by surface energy. The bulk density of sediment, the Zeta potential of a solid particle and the shear strength of sediment are measured.
As Zeta potentials approach to zero, bulk densities decrease and shear strengths increase. The bonding force calculated by Rumpf's equation at a contact point of particles also increases with the decrease of Zeta potentials.
The structure of sediment depends upon the electric surface potential of solid and the width of diffused electrical double layer at solid-water interface.抄録全体を表示PDF形式でダウンロード (848K) -
FeO-Fe2O3系鉄酸化物の磁性に関する研究 (第2報)長谷部 茂, 佐藤 敏人, 中塚 勝人, 下飯坂 潤三1975 年 91 巻 1044 号 p. 73-76
発行日: 1975/02/25
公開日: 2011/07/13
ジャーナル フリーThe artificial magnetite obtained by wet method is formed by the following chemical reaction._??_
The magnetite obtained by simultaneous precipitation from the mixed solution of ferrous and ferric ion (1: 2) does not show the magnetic transformation at low temperature (-160°C or thereabout), and it is spontaneously oxidized in air. In this study, it was found that the spontanious oxidation of the precipitated magnetite in air was prevented by adding PVA into the magnetite suspension immediately after the formation of it. Nevertheless, so far as it is formed at the temperature lower than 100°, the magnetite did not show the low temperature magnetic transformation.
When the precipitated magnetite is aged in the solution at the temperature 150°C-250°C, the transformation was observed on it. The magnetization of it increased gradually with the raise of the aging temperature.
It was observed by X-ray diffraction that any sample mentioned above changed into magnetite and α-hematite by heating at 700°C in vacuum.抄録全体を表示PDF形式でダウンロード (629K) -
吾妻 潔, 小川 洋一1975 年 91 巻 1044 号 p. 77-82
発行日: 1975/02/25
公開日: 2011/07/13
ジャーナル フリーEquilibrium in the reaction
CO2= [O] Cu+x+CO
was investigated at 1150°C. From experimental results, it was found that the activities of oxygen in liquid copper were increased by addition of both gold and silver, and decreased by tin and nickel.
εOAu=∂lnψOAu /∂NAu=27Au<0.00930
εOAg=∂lnψOAg /∂NAg=2.6 NAg<0.0305
εoSn=∂lnψOSn /∂N Sn=-18 NSn<0.0416
εONi=∂lnψONi/∂NNi=-3.5 NNi<0.0956
The experimental values of the activity coefficients of oxygen were compared with those predicted from solution models. The quasi-chemical model of Alcock and Richardson with Z=2 and the regular model of Belton and Tankins gave good agreement with the experimental results in Cu-Ag-O system (NAg<0.0305). In Cu-Sn-O system (Nsn<0.0416), Alcock and Richardson's quasi-chemical model with Z=1 gave fair agreememt within the experimental errors.抄録全体を表示PDF形式でダウンロード (812K) -
1975 年 91 巻 1044 号 p. 85-90
発行日: 1975/02/25
公開日: 2011/07/13
ジャーナル フリーPDF形式でダウンロード (1252K)
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