巻号一覧
23 巻, 5 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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1961 年 23 巻 5 号 p. 147-154
発行日: 1961年
公開日: 2009/09/04
ジャーナル フリーPDF形式でダウンロード (5167K) -
菊地 勝弘, 孫野 長治1961 年 23 巻 5 号 p. 155-158
発行日: 1961年
公開日: 2009/09/04
ジャーナル フリーContinued from the last observation, charges on fairly large natural snow crystals were measured by means of a horizontal electric field before and after their artificial melting during snowfall alternately. It was found that the snow crystals of all sizes obtained considerable positive charge when they were melted. This observation appears to explain the general phenomenon that in steady rainfall negative surface electric field is predominant and raindrops carry positive charge in most cases, while in steady snowfall surface electric field is predominant and most of the snow crystals are charged negatively.抄録全体を表示PDF形式でダウンロード (3276K) -
大西 勁1961 年 23 巻 5 号 p. 159-166
発行日: 1961年
公開日: 2009/09/04
ジャーナル フリーVarious rheological properties of deposited snow, such as Young's modulus, internal friction, creep, stress relaxation, velocity dependency of a viscosity etc., are explained by a new model. The principal feature of the model is a dashpot which shows the viscosity of a ice-bond between ice particles. It is assumed that the viscosity of the dashpot increases by a sintering between ice particles following the (1-exp (- (t/τ) 1/2)) type function, and decreases proportionally to the viscous work done by the outer force at the ice-bond.
An increase of Young's modulus or the viscosity of a packed snow is due to the sintering between. ice particles and is expressed by this function. Creep and stress relaxation of the deposited snow are also approximately expressed by the function of this type, suggesting that the recovery of ice-bonds by the sintering is also included in the process of creep or stress relaxation. By solving the differential equations of the model which contains two constant springs and the dashpot, experimental creep or stress relaxation curve is explained. Velocity dependency of the viscosity and frictional phenomena on the snow are also discussed by this model.抄録全体を表示PDF形式でダウンロード (1180K) -
広瀬 潔1961 年 23 巻 5 号 p. 167-168
発行日: 1961年
公開日: 2009/09/04
ジャーナル フリーPDF形式でダウンロード (377K)
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