All issues
Volume 12, Issue 4
Displaying 1-13 of 13 articles from this issue
- |<
- <
- 1
- >
- >|
-
E. MARUYAMA, Y. YAMAMOTO1957 Volume 12 Issue 4 Pages 121-124
Published: March 31, 1957
Released on J-STAGE: February 25, 2010
JOURNAL FREE ACCESSIn order to study the microclimate of small concave ground in different size, subjected to the seasonal variation of the temperature, the authors placed maximum and miumum thermometers provided with small screen shelters at 10cm above each of artificial neary cincular ground and the flat bare ground as the standard plot (see Fig. 1). And observation are made from April 1953 to February 1954. The maximum air temperature in all concave grounds always show unexpectedly much warmer than in the flat ground, if the weather condition is fine, and it become much warmer with the decresing diameter, so far as the diameter ranges between 5 to 1 meter.
On the other hand the nocturnal air temperature in the concave ground is much colder than on the standard plot, especially it becomes very cold in winter, being acumlated cold air at the bottom of the concave ground.
It is seen from Fig. 2, that the nocturnal air temperature in the concave grounds becomes much colder with increasing diameter.View full abstractDownload PDF (446K) -
E. MARUYAMA1957 Volume 12 Issue 4 Pages 125-127
Published: March 31, 1957
Released on J-STAGE: February 25, 2010
JOURNAL FREE ACCESSThe thermal constants of soil are well known to be influenced by the water content. But their relations are not exactly determined. Patten obtained those relationship by his excellent experimental researches. His experimented soil was however comparatively of dry state, so that those results can not be applied to such soil as the author's.
The method employed in this study is phsical one. The soils examined were two sorts of soil, e.i loam and the mixture of loam and clay. And their conductivity, thermal as well as of temperature, specific heat and specific volume are determined in relation to their water content.
The apparatus as shown in fig. 1 consists of a brass cylinder in which soil puts, its surrounding cooling jacket containg ice and water, and three thermocouples are inserted to soil at three separate points (see fig. 1, 2, 3).
The equation of the heat conduction of soil in the cylinder is
-Cρ/K∂θ/∂t=1/r{∂θ/∂r+r∂2θ/∂r2}…… (1)
The temperature derivatives respectivly to distance from the center of the cylinder, as well as to time are represented approximately by
δθ/∂r=θ1-θ2/Δr1+θ2-θ3/Δr2/2=θ1-θ3/2Δr=θ1-θ3/4…… (2)
∂2θ∂r2=θ1-θ2/Δr1-θ2-θ3/Δr2/Δr1+Δr2/2=θ1-2θ2+θ3/2/4/2=θ1-2θ2+θ3/4…… (3)
∴ -Cρ/KΔθ/Δt=1/8{3θ1+θ3-2θ2}…… (4)
Where θ1, θ2 and θ3 are soil temperatures at three different points off from the center.
The seciffc heats of the soil are obtained by using another applicance —a calorimtter— and a thin rubber sack water-tightly packed with soil of known moisture content.
The results obtained are shown in fig. 3.View full abstractDownload PDF (357K) -
M. KAWAMATA, Y. TSTKIJIMA, T. SATO1957 Volume 12 Issue 4 Pages 128-130
Published: March 31, 1957
Released on J-STAGE: February 25, 2010
JOURNAL FREE ACCESSThe experiment on the effect of shelter-hedge for the growth of uplandrice against typhoon was carried out at summer, 1955. The hedge whose height was 250cm was made from woods round by sweetpotato stems, and the screening ratio was 80%.
The results obtained is as follows;
(1) The half velocity zone reached at about 7 times the hedge height.
(2) At the above zone the soil temperature was a few heigher than at the standard zone and the yield was also superior.View full abstractDownload PDF (449K) -
M. NAKAHARA, T. TAHARA, S. NAKAZAWA1957 Volume 12 Issue 4 Pages 131-134
Published: March 31, 1957
Released on J-STAGE: February 25, 2010
JOURNAL FREE ACCESSIn the summer of 1954, we have continued our experiments on the farm irrigation programs using an uplandrice at the field of Tokyo Uuiversity of Agriculture and Technology. Although disturbed by bad weather conditions prevailed in the early summer and typhoons in the September, we have get the results to demonstrate some effects on the farm irrigation and also the differences of soil moistures and soil temperaturs by plots as shown in Table 1 and 2.View full abstractDownload PDF (552K) -
H. YAMAZAKI, K. NISHIMURA, K. YAMADA1957 Volume 12 Issue 4 Pages 135-137
Published: March 31, 1957
Released on J-STAGE: February 25, 2010
JOURNAL FREE ACCESSThis experiment was carried out to know the relation of light to the ovipostion of Antheraea moth which ordinarilly deposits their eggs in the night stopping at the dawn. The growing light which suppresses the oviposition of the moth was measured. The results are as follows.
1) The day light of 20Lux inhibits the oviposition partially of the moths, 30Lux most of the moths and 40Lux all of the moths.
2) The intensity of the growing light reaches to the effective degree within 20 to 30min, at the dawn.View full abstractDownload PDF (435K) -
1957 Volume 12 Issue 4 Pages 137-137,144
Published: March 31, 1957
Released on J-STAGE: February 25, 2010
JOURNAL FREE ACCESSDownload PDF (253K) -
Part 4. Turbulent Transfer Phenomena over the Waving PlantsH. INOUE1957 Volume 12 Issue 4 Pages 138-144
Published: March 31, 1957
Released on J-STAGE: February 25, 2010
JOURNAL FREE ACCESSSurveying the existing theories on turbulent transfer above the earth's surface the author has pointed out that the following relations are considered most reasonable for the vertical distributions of wind velocity U, air temperature Θ, humidity E and CO2 concentration C and also for the turbulent fluxes of heat L, water vapor Q and CO2 P:
U/V*=2.303/klogz-d/z0-αgL/ρCpΘV*3(z-d),
Θ-Θ0/Θ*=2.303/klogz-d/z0-αgL/ρCpΘV*3(z-d),
E-E0/E*=2.303/klogz-d/z0-αgL/ρCpΘV*3(z-d)
and C-C0/C*=2.303/klogz-d/z0-αgL/ρCpΘV*3(z-d);
L=ρCp(U2-U1)(Θ1-Θ2)/{2.303/klogz2-d/z1-d-αgL/ρCpΘV*3(z2-z1)}2,
Q=(U2-U1)(E1-E2)/{2.303/klogz2-d/z1-d-αgL/ρCpΘV*3(z2-z1)}2
and P=(U2-U1)(C1-C2)/{2.303/klogz2-d/z1-d-αgL/ρCpΘV*3(z2-z1)}2.
The empirical constant α has been found to be within the range from 0.6 to 3. The friction velocity V*, friction temperature Θ*, friction humidity E* and friction concentration C* are respectively related to the turbulent fluctuations in corresponding elements.
Making use of the above relation the author presents an aerodynamical method of estimating the rate of photosynthesis of vegetations. Preliminary results of this method applied to a paddy field have been presented and it seems that these results are considerably promising and encouraging for its further application.View full abstractDownload PDF (1045K) -
M. NAKAHARA, T. TAHARA, S. NAKAZAWA1957 Volume 12 Issue 4 Pages 145-147
Published: March 31, 1957
Released on J-STAGE: February 25, 2010
JOURNAL FREE ACCESSWe have made further experiments in the winter season of 1953 after our former one on lots shown Fig. 1 to analysis the significant difference of baido types and the frequeecy of baids operations with special reference to the types of sowing.
From our experiments, the effect on the yield of wheat by the lots of round sowing, as shown in Fig. 2 has been recognized.View full abstractDownload PDF (360K) -
T. FUJIKAWA, Z. OKADOME, T. UTSUNOMIYA1957 Volume 12 Issue 4 Pages 148-150
Published: 1957
Released on J-STAGE: February 25, 2010
JOURNAL FREE ACCESSDownload PDF (411K) -
M. KUSAKABE1957 Volume 12 Issue 4 Pages 151-154
Published: March 31, 1957
Released on J-STAGE: February 25, 2010
JOURNAL FREE ACCESSThe author estimated the potential evapo-transpiration from the observed air temperature, and calculated the water balance at Fukuoka. We can suppose that the amount of water surplus which was obtained above calculation, is the amount of effective precipitation. Monthly amount of effective precipitation is shown in Table 1. Table 2 shows the fluctuation of effective precipitation (1890-1955).
The amount of effective precipitation in the function of the amount of actual precipitation, evapo-transpiration and soil moisture storage. The relation between the amount of effective precipitation and actual precipitation is the most closely. The relation between them is shown in Table 3 and Fig. 1.
When the monthly total of precipitation and evapo-transpiration of two months are the same, as the daily amount of them are different, the monthly amount of effective precipitation should be differ. But we should not greatly error, if we assume the monthly calculated data as the actual amount of effective precipitation. The difference between the monthly data and the total of the daily data is shown in Table 4. Table 5 and Fig. 2 show the relation between monthly data and total of daily data.View full abstractDownload PDF (550K) -
Y. DAIGO, T. NOSE1957 Volume 12 Issue 4 Pages 155-156
Published: March 31, 1957
Released on J-STAGE: February 25, 2010
JOURNAL FREE ACCESSFrom the standpoint of applied meteorology, it is a very important problem to decide the area to which the amount of a rainfall at a weather station is applicable.
In this paper the authors try to decide the area and shape of the regions where the amounts of a rainfall by a front or typhoon differ from those observed at several stations in the Kanto district by less than ±10, ±20 or ±30%.
And the following results are obtained.
1) Fig. 1 shows the variation of shape in the applied area.
2) Fig. 2 shows the relation of the applied to the rasio of permission.View full abstractDownload PDF (199K) -
Saga Sectional Meteorological Observatory1957 Volume 12 Issue 4 Pages 157-158
Published: March 31, 1957
Released on J-STAGE: February 25, 2010
JOURNAL FREE ACCESSThe relation between the rainfall of various districts and the typhoon is settled by the position and the track of typhoon.
The rainfall of various districts as a rule when the typhoon exists southwards from the line of the 28th degree of the north latitude.
The rainfall of Mitsuse is nearly doubles of Saga as Fig. 1 when the typhoon passes the west or north side of Saga.
The rainfall of Mitsuse is about eleven fold of Saga as Fig. 2 when the typhhoon lands in the southern end of Kyushu and then progresses to north-north-eastwards or the typhoon passes the east of Miyazaki and then progresses to northwards.
But the rainfall of Mitsuse is only thrice when the typhoon lands in the southern end of Kyushu and then progresses to northwards.View full abstractDownload PDF (223K) -
[in Japanese]1957 Volume 12 Issue 4 Pages 159-160
Published: March 31, 1957
Released on J-STAGE: February 25, 2010
JOURNAL FREE ACCESSDownload PDF (302K)
- |<
- <
- 1
- >
- >|