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77 巻, 876 号
選択された号の論文の9件中1～9を表示しています
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沢水および土壌岩石試料の採取大橋 収司1961 年 77 巻 876 号 p. 370-376
発行日: 1961/06/25
公開日: 2011/07/13
ジャーナル フリーChemical Prospecting for uranium deposits has been carried out by the fluorometric determination of uranium in rivulet waters, soils and rocks. This study deals mainly with the sampling of these materials.
In connection with the sampling of rivulet waters, cares were taken in the following items:(1) whether the filtration is needed or not in order to eliminate the suspending particles and other impurities, (2) the selection of the sampling apparatus, (3) with respect to assure good results, the addition of nitric acid is necessary or not, (4) the possible effect of adsorption of uranium on the wall of the sampling bottles, (5) the effect of pH, (6) the relationship between the uranium content and the flowing amount of water, (7) the distribution of the sampling stations, (8) the scale of the anomalous area, etc.
As for the soils and rocks, this study discusses the following items:(1) the applicabilities of the sampler designed by the author, (2) the surface layer soil, especially concerning three dimensional distrbution of uranium including topographic conditions, (3) the sampling depth, (4) base rock uranium distribution, (5) the distribution of the sampling stations, (6) the scale of anomalous area, etc.抄録全体を表示PDF形式でダウンロード (3440K) -
圧縮における試験片の形状効果と寸法効果下村 弥太郎, 高多 明1961 年 77 巻 876 号 p. 377-382
発行日: 1961/06/25
公開日: 2011/07/13
ジャーナル フリーThe authors have made a series of researches concerning the mechanical behaviors and the breaking mechanism of some rocks under uniaxial compression.
In this paper, we report how compressive strength and fracturing pattern of rock specimens vary with their slenderness ratios and dimensions.
The following results are concluded;
(1) the breakage of rocks by compression is the combined result of shearing and teusile fractures;
(2) and consequently, a new relationship between compressive strength and slenderness ratio of rock specimens is proposed:
σc= α+β· d/h+γ· h/d (α, β, γ=const.)
(3) Increasing dimensions of a rock specimen, some factors, such as Griffith's cracks in a specimen, act to decrease its compressive strength, as the dimensions of the rock specimen are increased, whereas others, e. g. change of stress distribution, act inversely.
(4) Therefore, the fracturing stress is almost constant for different volume of rock specimens.抄録全体を表示PDF形式でダウンロード (925K) -
会田 俊夫, 佐藤 進1961 年 77 巻 876 号 p. 383-387
発行日: 1961/06/25
公開日: 2011/07/13
ジャーナル フリーln this paper we have discussed the Sqfety Factor of Winding Ropes on the ground of the results obtained through our researches, one of which we have already reported in our first and second papers on the longitudinal vibration of winding ropes in vertical shafts, and another of which we have showed in the other paper on the bending stress of wire ropes.
Some results we have obtained through our researches are as follows;
1) The Safety Factor of Winding Ropes in Vertical Shafts, which is stipulated in the Japanese Regulation for Mining Safety, is found imperfect, especially the Value of the 2nd Safety Factor F2 (dynamic safety factor) is too small to keep the safety of winding ropes, the reason being too small an estimate of sending stress and dynamic pull.
2) The decrease in F1 in proportion to the depth of a shaft seems to be groundless.
3) We propose a new safety factor of winding ropes in vertical shafts, estimating Eb=20, 000kg/mm2for bending stress and considering the vibration of winding ropes when loaded or braked in a mechanicalmethod.抄録全体を表示PDF形式でダウンロード (862K) -
宮脇 猪之介, 添田 徳彦, 塩田 莞爾1961 年 77 巻 876 号 p. 389-393
発行日: 1961/06/25
公開日: 2011/07/13
ジャーナル フリーSamples of lime stone were ground in a laboratory ball mill to evaluate the energy-size reduction relationships.
Both Gauding-Schuhmann and Rosin-Rammler functions are applicable to the size distributions of the grinding products in the fine sizes.
When G-S function is used, the equation suggested by Charles may be applied.
E=A [K1-n-α-n+1/αx01-n]
where E is the grinding time, xo is the initial size, K and a are respectively the size modulus and distribution factor in G-S function, and A and n are constants.
In the case where R-R function is used, the relation becomes such as the equation suggested one of the authors.
E=A1 [b1-n-x01-n/T (a-n+1/a)]
where b and a are respectively the absolute size constant and dispersion constant in R-R function.
Above equations are also deduced in more simple forms by considering the rates of production of the various size fractions in ball milling.抄録全体を表示PDF形式でダウンロード (776K) -
炉内反応から見た操業データの解析吾妻 潔, 亀谷 博, 佐藤 俊次1961 年 77 巻 876 号 p. 394-400
発行日: 1961/06/25
公開日: 2011/07/13
ジャーナル フリーAn extension of the previous study on the correlation analysis of the practical operation data of the shaft furnace for Ni smelting was carried out.
The respective and dual influences of coke weight per day (C) and ore weight per day (O) on Rr, that is (Fe weight in matte)/(FeO weight in slag), were investigated and the results obtained were as follows:
(1) Rr=5.3 (C/O-0.20).
(2) Rr=-0.001 (0-1110) at C/O=const.
(3) Rr had some correlations with C and O of the day before that day as well as those of the day on which Rr was measured.
Thus C/O played a role in Ni smelting operation to determine Rr, which was directly concerned with the yield of Ni.
The most desirable value of C/O with the shaft furnace for the maximum profit were determined with the following formulae obtained from the above relations:
C/O=1/100√P1·Ni0%/P3+0.19
C/O=√1/100·P2/P2·Ni0%+0.002+0.20where P1: Price of Ni in matte per ton
P2: Price of Ni in ore per one per cent, per ton
P3: Price of coke per ton
Nio%: Ni per cent in ore
J. Min. Met. Inst. Japan, Vol.75, No.854, 537-544, 1959. The sum of ore and sinter In 10, 000yen抄録全体を表示PDF形式でダウンロード (1029K) -
1961 年 77 巻 876 号 p. 400
発行日: 1961年
公開日: 2011/07/13
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下村 弥太郎1961 年 77 巻 876 号 p. 401-412
発行日: 1961/06/25
公開日: 2011/07/13
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原田 静夫, 宮崎 四郎, 春 富夫1961 年 77 巻 876 号 p. 413-417
発行日: 1961/06/25
公開日: 2011/07/13
ジャーナル フリーPDF形式でダウンロード (798K) -
今泉 常正1961 年 77 巻 876 号 p. 419-442
発行日: 1961/06/25
公開日: 2011/07/13
ジャーナル フリーPDF形式でダウンロード (7036K)
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