巻号一覧
29 巻, 3 号
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尾崎 勇造, 高木 子平1967 年 29 巻 3 号 p. 65-69
発行日: 1967/05/30
公開日: 2009/07/23
ジャーナル フリーThis report describes flashover characteristics of the insulatorstrings and the rod-plane gaps covered with snow by switching surge and standard impulse voltage. From the various tests, it is shown that switching surge withstand voltage of a suspension string whose surface is covered with snow, is extremely lower than that under dry clean conditions about 50% ones.抄録全体を表示PDF形式でダウンロード (3148K) -
竹下 信也, 高木 子平1967 年 29 巻 3 号 p. 70-73
発行日: 1967/05/30
公開日: 2009/07/23
ジャーナル フリーThis article describes a summary of the snow damage and the counterplan of the communication installations for the power industry. The effects of snow and ice upon the transmission loss of power line carrier, 12 Gc microwave radio links, and the reflector are also shown.抄録全体を表示PDF形式でダウンロード (9277K) -
斎藤 新一郎, 上牧 由秀1967 年 29 巻 3 号 p. 74-77
発行日: 1967/05/30
公開日: 2009/07/23
ジャーナル フリーDeciduous trees, especially willow family (Salicaceae), have not been noticed worthy for rail-protecting forest against snow-drift. However, low tree-belt of pioneer tree species is indispensable for the establishment of general shelterbelt at severe-conditioned region.
On March 1967 the writers investigated Japan poplar (Populus maximowiczii) and Todo fir (Abies sachalinensis) mixed stand at Kamitonbetsu, northern Hokkaido. Populus were planted in 1940 and Abies in 1941. Stem-analysis shows that Populus reached 10 meters high during 10 years after planting and helped the early growth of Abies.
It is certain that if willows (Salix) and Populus are planted firstly, within 10 years will be gained low tree-belt and that they will cover the early blank of time of proper but slow-growing evergreen conifers.抄録全体を表示PDF形式でダウンロード (3889K) -
ヘリコプターによる融雪促進大沼 匡之, 中村 千里, 小林 一雄, 高橋 久三郎1967 年 29 巻 3 号 p. 78-83
発行日: 1967/05/30
公開日: 2009/07/23
ジャーナル フリーThe methods of promoting the melting of snow by covering snow surface with black powder scattered from a helicopter were investigated, in order to make clear the problems involved in such procedures.
The results of experiment pointed out two main factors, i.e., the effectiveness of the black powder in the promotion of melting of snow, and the degree of the scattering ability of the duster of a helicopter. And the degrees of the promotion of melting of snow were found to be determined by the actual amount of the powder settled on a snow surface.
The quantity of snow melted by the covering with the black powder (Mp) was as follows :
Mp=m (Rs) n, m=Ae-Bx, and n=cxD, where 3<x<20 g/cm2,
Rs : solar radiation, m, n : coefficients depending on x (the amount of settled powder) and A, B, C, D (constants characteristic of the powder).
On the other hand the scattering ability of the duster was known to be conditioned by the liquidity of the powder, i.e., bulk density and coefficient of friction, etc.
“Method of albedo” is conceived to be superior to the others in estimating the amount of the settled black powder, and consequently, the “albedo-meter” which shows the direct amount of the settled black powder was devised and used for the estimation of the amount of the scattered black powder.抄録全体を表示PDF形式でダウンロード (1123K)
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