巻号一覧
7 巻, 4 号
選択された号の論文の11件中1～11を表示しています
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Short-Period Temperature Variations in the Coastal Summer Water Observed by a Resistance ThermometerNaoiti INOUYE1938 年 7 巻 4 号 p. 191-197
発行日: 1938/11/15
公開日: 2008/02/29
ジャーナル フリーPDF形式でダウンロード (363K) -
コールド・リダクション・プレートに就て富枡 建造, 塙 幹仁1938 年 7 巻 4 号 p. 198-202
発行日: 1938/11/15
公開日: 2008/02/29
ジャーナル フリーWith the object of increasing the uniformity of the thickness of tin plate a new process of rolling noted as the cold reduction has been put in practice lately.
Succeeding the previous study the authors have measured this time the thickness of two kinds of the cold reduction tin plates as mentined above, one the products of the U. S. Steel Corporation 951b. base cokes by continuous rolling system, and the other the Japanese made 851b. base cokes by strip mill system, and have studied on its irregularity.
The sizes of the small test pieces sheared off from the sheats or the strip, and the measuring points on them were as shown in Fig. 1, the measuring points being 2cm apart with one another just the same as in the previous experiment.
The measuring instrument of the thicknes was also the same dial indicator which had been used in the previous experiment(1).
The results of measurements of this time are as shown in Table 1, 2 and Fig. 2. In Table I the figures for the samples c and d are quoted partialy from the previous report for com-parison with the present results. The most noticeable result is the point that the coefficient of partial irregularity of the thickness of one sheat, Δ, was very small as 0•624% in the sample a, being compared with the value for the sample b, 1•16%, and the values previously obtained for the two hot rolled samples c and d, 1.01 and 1•14% respectively. The coefficient of irre-gularity of the mean thickness among sevral sheats of the same class, Dm, was also remarkably small as 0•838 and 0•503% in both samples of the cold reduction plate a and b, but it can not be concluded that the values for the cold reduction plates are always smaller than those for the hot rolled plates, because the value for sample d in the previous experiment had been smallest as 0•10% as shown in Table 1.抄録全体を表示PDF形式でダウンロード (314K) -
富枡 建造, 池田 〓一1938 年 7 巻 4 号 p. 203-206
発行日: 1938/11/15
公開日: 2008/02/29
ジャーナル フリーThe authors have designed two dial vacuum indicators of the β type(1) for oval cans, one of which has two ellipses of seat rail for both 1 lb and 1/2 lb cans, and the other has only one elliptic seat rail for 0•7lb cans, the one as shown in Fig. 1 is the former kind.
For the present study we have measured with the instruments both the top and bottom end depths of the following cans, i. e. a 4 doz. box of 1 lb and a 8 doz. box of 1/2 lb tomato-sardine cans, and a 4 doz. box of 0•7 lb tunny-steak cans.
The, vacuum in the cans were also measured by an ordinal vacuum testor of Bourdon tube type, and the results of both the measurements were plotted in the υ-β (Vacuum-end depth) diagrams as shown in Figs. 2, 3 and 4.
The mean straight lines in the diagrams were drawn by the least square method, the mean values of deviations of the measured points from the mean lines of the diagrams are as shown in Table 1.
The values for 1/2 lb tomato-sardine cans were a little larger than those of the other two, the reason of which is considered that the size of 1/2 lb can ends is the smallest among the three and accordingly the depth of them due to the vacuum in the can is the smallest, there-fore the least irregularity of thickness of tin-plate and can shape, or the injury of which has greater effect on the vacuum indication of the can end depth.
In both the 1/2 lb and 0.7 lb cans the mean deviations of the measured points for the top ends were greater than those for their bottom en1s, especially for the 1/2 1b cans the value being as large as 2•7 inch in vacuum, and not so large but slightly in the case of the 0•7 lb cans; this was because the maker marks of the cans were pressed out very close, and more closer in the case of 1/2 lb cans, to the just centre of the top ends where the measuring point of the dial indicator spindle touched and the measurements were made irregular.
If the marks bad been shifted away slightly from the centre, then the mean errors for these cases would also have been made smaller than those for the bottom ends, therefore it may be said that the mean error of the vacuum indication of the dial indicator with the scale calibrated by the mean straight line for the top end depth, which is obtained by such a method as described here, is always less than 1.8 inch vacuum in every case of the three kinds of oval cans tested in this experiment.抄録全体を表示PDF形式でダウンロード (874K) -
宮崎 千博1938 年 7 巻 4 号 p. 207-212
発行日: 1938/11/15
公開日: 2008/02/29
ジャーナル フリーDaily catches of red, dog and silver salmons at Kam fishing ground, East Kamchatka, were examined in relation to the meteorological and oceanographical conditions, which were observed 3 times a day. Northerly wind with southwestern current, having low temperature and low salinity, is favourable for red; northwesterly wind, with slack water at low tempera-ture but at high salinity, seems to be favourable for dog; while high salinity is seemingly unfavourable for silver salmon.抄録全体を表示PDF形式でダウンロード (246K) -
安田 秀明1938 年 7 巻 4 号 p. 213-216
発行日: 1938/11/15
公開日: 2008/02/29
ジャーナル フリーThe size of meshes and their strength were measured with 6 parts (I to VI arranged from the sea surface toward the bottom) of a net used in a fishing ground 50m deep. The size of mesh is, in its median, a little greater at the part, which has been situated at the intermediate level (III, IV) than at the remaining. Its variation is locally the less, the greater the median. The median of the strength decreases from the upper to the lower levels. Its variation at the lowermost parts (V, VI) is greater than that at the uppermost, but less than that at the intermediate parts.
The reason why the net had become less strong at lower parts, was ascribed to the fact known experimentally, that the lower meshes of a loaded net, which is spread on a vertical frame, as is the case of the used net, is stretched more tightly than the upper meshes.抄録全体を表示PDF形式でダウンロード (188K) -
ホタールの魚油酸化防止力大谷 武夫, 安藤 貞, 薄井 與兵衞1938 年 7 巻 4 号 p. 217-219
発行日: 1938/11/15
公開日: 2008/02/29
ジャーナル フリーOf several distillates obtained from wood tar by fractional distillation, the fraction 100°-120°C was found the most effective as antioxidant of the cod liver-oil and also found to maintain vitamin-A content of the latter intact.抄録全体を表示PDF形式でダウンロード (183K) -
III.餌料蛋白の経済的給與量の決定右田 正男, 花岡 資1938 年 7 巻 4 号 p. 220-226
発行日: 1938/11/15
公開日: 2008/02/29
ジャーナル フリーIt has been shown that we have the following relation between the increase of body protein p and the feeding amount of protein x
p=e-a-bx(x-x0),
where x0 is the amount of food protein equivalent to the maintenance protein and a and b are constants.*
Let the unit price of fish protein be h and that of food protein k, then the gain by culture Y will be
Y=he-a-bx(x-x0)-kx.
Putting h/k=m and Y/k=y, we have
y=me-a-bx(x-x0)-x. (1)
Let xE be the most economical amount of food protein for a given value of m, then y will take the maximum va ue when x=xE. Since, however, x lies always between x0 and x0+1/b (the amount of food protein which produces the maximum growth*) and dy/dx=me-a-bx( ?? +bx0-bx)-1 d2y/dr2=mbe-a-bx(bx-bx0-2),
we have the following relation between m and xE,
m=e ?? +bxE/1+bx0-bxE (2)
In the equation (2), we observe that XE varies parallel with m; in other words, the higher is the price of fish protein the more profitable is it to increase the feeding amount of protein. If the price of food protein is neg igible as compared with the price of fish protein, the econom-ical amount of food protein becomes x0+1/b, agreeing with the feeding amount for the maximum growth.
Since xE denotes only the most economical (inc ?? uding the case of the minimum loss) amount of food protein for a given value of m, it depends quite on the value of m whether one can make or not a profit with economical feeding amount. In order to solve this question we must find the minimum m at the point of economical balance. Since at this point y=0, we have m=xea+bx/x-x0 (3)
The value of m in this equation is minimum when x=bx0+√b2x02+4bx0/2b, and takes the following value mm ?? n=(1+B)e-a+B, where B=bx0+√b2x02+4bx0/2
Thus in order that the fish culture can be in commercial profit, the price of fish protein should be at least (1+B)e-a+B times as much as the price of food protein, or the price of fish should be at least r/s(1+B)e-a+B times as much as the price of feedstuff, where r and s are the percentages of protein in fish and feedstuff respectively. The value of the minimum m can be also found by solving (2) and (3) simultaneously. The maximum profit ymax for a given value of m can be found by putting the corre-sponding value of xE into (1)
ymax=xE-x0/1+bx0-bxE (4)
From (4) and (2) we can observe that the relation between the maximum profit and m is expressed by a concave increasing curve, which shows that the profit by fish culture is far greater than proportional to the value of m.抄録全体を表示PDF形式でダウンロード (391K) -
川口 武男, 小林 隆太郎, 山田 忠男1938 年 7 巻 4 号 p. 227-228
発行日: 1938/11/15
公開日: 2008/02/29
ジャーナル フリーThe correlations between fish meat colour of the canned tomato sardine and their freshness are reported in this paper. With back of each of 3 to 5 sardine from each can, the amount of white and black stimulus, as well as the hues, were measured by BLOCH's three colour filters method. Percentage of NH ?? -N of each sample was also determined as the measure of freshness. From the results, correlation tables are obtained as shown in tables 1 to 3, with the correlation ratios among them as listed in table 4.抄録全体を表示PDF形式でダウンロード (103K) -
殖田 三郎, 岡田 喜一1938 年 7 巻 4 号 p. 229-236
発行日: 1938/11/15
公開日: 2008/02/29
ジャーナル フリーThe soundings of the sea-bottoms of Japan by Mr. H. NIINO et al. enabled the authors to confirm the presence of fairly rich algal flora down to a depth of 130 meters, though one deeper than 80 meters bad not been put on record hitherto. Remarkably enough, Ecklonia stolonifera OAM. was found in a flourishing condition at a depth of 199 meters. This depth is perhaps the deepest ever known of the marine algae of the world.抄録全体を表示PDF形式でダウンロード (1965K) -
酒向 昇1938 年 7 巻 4 号 p. 237-238
発行日: 1938/11/15
公開日: 2008/02/29
ジャーナル フリーA large number of specimens of Sardinia melanosticta (T. & S.) obtained in Ibaraki Pre-fecture, ranging from 22mm to 179mm in body length, were examined. Some exceptionally shorter gill-rakers were found at the inner flexure of the first gill-arch of the specimens measuring 35mm and over in body length. The number of the shorter gill-rakers increases, on the average, with the increase in body length. The appearance of the shorter gill-rakers in such a young stage may be taken as a criterion to distinguish Sardinia melanosticta from S. sagax (sensu extenso) which is often regarded to be synonymous with the former.抄録全体を表示PDF形式でダウンロード (702K) -
佐藤 六治1938 年 7 巻 4 号 p. 239-250
発行日: 1938/11/15
公開日: 2008/02/29
ジャーナル フリーPDF形式でダウンロード (758K)
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