巻号一覧
66 巻, 744 号
選択された号の論文の4件中1～4を表示しています
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沼鉄鑛の含水構造について向 正夫1950 年 66 巻 744 号 p. 202-207
発行日: 1950/05/25
公開日: 2011/07/13
ジャーナル フリーThe crystal form of Bog-iron-ore has been considered, in the previous report of our studies, as a Goethite ferm with lower degree of crystallization. In the present report, its hydrated structure is discussed from the dehydration curves of thermobalance-and differential-thermo-analyses, and from dehydration-and moisture-reabsorbtion-tests. Main results obtained are as follows:
1. The adhesive A-vdier of Bog-iron-ore may be devided into three types: moisture, absorbed water, and binding water. Nearly equal amounts of water are found in each type of hydration.
2 When Bog-iron-ore is heated slowly, the moisture is lost under 100°Cand the absorbed wa-ter is lost gradually over the range between 100°C and about 220°C.The binding water is lost suddenly at about 220°C.
3. The binding water which has been considered to be combined in the crystal lattice of Goethite, is suposed to be a sort of absorbed water finely dispersed in crevices of crystallite of Goethite. Therefore, it can be said that the lattice in its crystallite of Goethite has a definite type of crystal form other than that of hematite and has the special structure in its secondery crystal form.抄録全体を表示PDF形式でダウンロード (1931K) -
大森 五郎1950 年 66 巻 744 号 p. 208-216
発行日: 1950/05/25
公開日: 2011/07/13
ジャーナル フリーTo succeed in the deep well-sinking method in shaft-opening, it is very important that let the skinfriction due to the earth pressure on the periphery of the well be as small as possible, that is, let reduction efficiency for the skin friction by the air which is ejected in the ground and ascends allong the Qutside wall of the well be max. For this purpose, position, distance, number of the air pocket, and pressure, capacity, of the air reservoir must be decided rationally. This paper give the solution for the most important problem which is to be base in those rational decision. That ist (1) the relation between the pressure, the velocity, of the air which ejects from the orifices in the airpockets and the external pressure on the periphery of the well sunk in the ground, (2) the relation between the pressure of the air pressure and the time accompaning to thus ejection.抄録全体を表示PDF形式でダウンロード (2155K) -
三野 英彦1950 年 66 巻 744 号 p. 217-231
発行日: 1950/05/25
公開日: 2011/07/13
ジャーナル フリーPDF形式でダウンロード (13185K) -
1950 年 66 巻 744 号 p. 232-235
発行日: 1950/05/25
公開日: 2011/07/13
ジャーナル フリーPDF形式でダウンロード (1340K)
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