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56 巻, 665 号
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中西 信1940 年 56 巻 665 号 p. 499-509
発行日: 1940/09/22
公開日: 2011/07/13
ジャーナル フリーPDF形式でダウンロード (2856K) -
波江野 清藏1940 年 56 巻 665 号 p. 510-521
発行日: 1940/09/22
公開日: 2011/07/13
ジャーナル フリーIn seismic prospecting, two essential factors determine the underground structure, namely velocity and depth. Although the calculation of travel times from the values of velocities and depths is not difficult, the converse-calculation of these values from the travel times-is very difficult. If the relation between velocity and depth has been obtained by means of other independent observations, such, for example, as by vertical shooting in deep bore holes, the reflection method the necessary calculations for which are simple is preferable to the refraction method, but since only a few bore holes in the oil-fields of this country are suitable for vertical shooting, the refraction method is almost as indispensable as the reflection method.
The practical value of the refraction method which, on account of the complicated calculations entailed, is regarded as small, could be greatly increased by the improved method of calculation here shown. The writer applies the method of mean in computing by the refraction method, in which the observed travel times along a number of lines are all plotted on a single graph with the same coordinate axes, the shot points being always the origin. The result is a group of points, distributed within a narrow band, the width of which is related to the irregularities in the underground structure. If the band is sufficiently narrow (within the limits of error), the underground structure is either homogeneous or in horizontally layers, but, if not, it is assumed to be the latter, which corresponds to the mean line for the band as obtained from the locus of the centre of gravity of the group of points. Corrections are then made, according as the observed travel times deviate from the mean line, to the assumed horizontal structure, resulting in the most probable structure. This method is illustrated with examples.抄録全体を表示PDF形式でダウンロード (2293K) -
前田 孝矩1940 年 56 巻 665 号 p. 522-532
発行日: 1940/09/22
公開日: 2011/07/13
ジャーナル フリーMany frothers are used in flotation practice, but the properties of them are not so well known. The, author employs a special device to measure the frothing power and investigate by it about 24 substances such as alcohols, acids, esters ana others. The'conclusions are as follows.
A) The frothing power is sensitively influenced by the Ifriolency of agitation. One revolution in 1300 r.p.m. of impeller affects the result.
In good conditions, frothing power and speed of impeller keeps a parabolic rela-Lion. It increases with exceedingly high power of index.
B) The frothing power varies with the speed of agitation and concentration of reagent, At a low speed of impeller, it increases slowly with concentration, but rapidly from a certain region of high speed. This rapid increase region depends upon the nature of the frdther. If we describe a surface of frothing power, variables being agitation and concentration, the surface exhibits -a particular form which is very characteristic of the reagent.
C) Owing to the characteristic of the surface, the relative frothing power gives a different value at the different speed of impeller. For example, in the concentration. of 0.01 c.c. of frother in 100 c.c. of water, the difference of the power between, n-hexyland n-amyl alcohol is 5.4 c.c./min. at 1150 r.p.m. while only 1.5 c: c./min. at 1225 r.p.m. So the value is not a definite one, but varies with concentration and agitation.抄録全体を表示PDF形式でダウンロード (1902K) -
1940 年 56 巻 665 号 p. 533-544
発行日: 1940/09/22
公開日: 2011/07/13
ジャーナル フリーPDF形式でダウンロード (2820K)
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