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Volume 22 (1966)
- Issue 6 Pages 245-
- Issue 5 Pages 183-
- Issue 4 Pages 123-
- Issue 3 Pages 79-
- Issue 2 Pages 35-
- Issue 1 Pages 1-
Volume 22, Issue 6
Displaying 1-4 of 4 articles from this issue
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On the Permeability and Diffusion in Mortar (2)Tadayoshi SASAKI, Moriyoshi OKAZAKI, Seiichi WATANABE, Gohachiro OSHIB ...1966 Volume 22 Issue 6 Pages 245-254
Published: December 30, 1966
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSThis investigation belongs to series of the studies on the above title and is a serial report of the experimental research on the diffusion of solute in mortar samples. In case, where the concrete containers are deposited on the deep-sea floor over a long period, it is feared that the water-soluble radioactive wastes may leak out through the pores of concrete container by action of the molecular diffusion, and contaminate the surrounding sea water. In order to investigate this problem, studies were carried out on the diffusion in mortar wall and diffusion coefficients were determined.
The result of radioactive iodide ion I-131 coincided nearly with that of chloride ion in the previous report, and between diffusion coefficient (D) and Coefficient of permeability (P) of I-131 it was observed that D is proportional to P0.5 in the same manner as in case of chloride ion. This proportional relationship was discussed in view of physics.
Regarding radioactive zinc, Zn-65, on the other hand, we could not catch an evidence of the diffusion in mortar samples, although diffusion tests were carried out in very porous mortar samples for a long period. These phenomena may be effectively attributed to the colloidallization of Zn-65 ion in mortar. The experiments forcing ZnCl2 solution into mortar pores were consequently carried out and it was observed that Zn (OH)2 colloid had a function choking up pores of mortar samples.View full abstractDownload PDF (1590K) -
Kenzo TAKANO1966 Volume 22 Issue 6 Pages 255-263
Published: December 30, 1966
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSBecause of the mathematical complexity of the fundamental equations in spherical coordinates, one treats the general circulation very often by plane coordinates, assuming the ocean spreads over a plane surface instead of a spherical surface, although only the variation of the Coriolis parameter with the latitude is retained. The Coriolis parameter is, furthermore, assumed to be linear with respect to the latitude. The present study shows at first this assumption holds fairly good. The distribution of the curl of the wind stress is not much affected by the sphericity of the earth. Contradictory to a previous result, the mass transport along the western boundary does not become twice as great as that obtained by rectangular coordinates, even if the sphericity is rigorously taken into account by use of spherical coordinates. In fact, it remains unchanged at low and middle latitudes but decreases by half on the contrary at higher latitudes because of narrowing of the ocean surface resulting from the approach of its eastern and western boundaries with the latitude due to the sphericity of the earth.View full abstractDownload PDF (1424K) -
Kenzo TAKANO1966 Volume 22 Issue 6 Pages 264-273
Published: December 30, 1966
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSAssuming a proportionality between the horizontal velocity of bottom currents and the vertically integrated horizontal velocity, we evaluate by perturbation analysis a possible effect of the bottom topography on the distribution of vertically integrated velocity (or mass transport) in the Pacific Ocean. A fundamental, first order solution is determined by the wind stress alone. It is shown that the topographic effect is of great importance, even though very weak currents are prescribed at the top of the frictional boundary layer at the bottom so that their velocity is only 2×10-5% of the vertically integrated velocity, or only one-tenth of the vertically averaged horizontal velocity where the depth is, for instance, 5000 m. If the bottom currents were several times stronger, the perturbation analysis would break down. This conservative estimate asserts that the topographic effect should be taken into account for detailed discussion about the general circulation.View full abstractDownload PDF (1450K) -
Takashi ICHIYE1966 Volume 22 Issue 6 Pages 274-284
Published: December 30, 1966
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSVertical velocities in the equatorial Pacific Ocean are determined by several methods from equations of motion and continuity. The vertical velocity at the depth of the maximum zonal current at the equator is computed from the vertically integrated zonal component of the equations of motion by use of the data on zonal currents and dynamic heights obtained on the DOLPHIN Cruise. The values have orders of magnitude of 10-3 to 10-2 cm/sec in general between 140°W and 92°W and their average shows upwelling due to the effect of the westward wind stress. The vertical distribution of the vertical velocity along the zonal section at the equator is determined from the difference equationderived from the same zonal equation of motion and it shows general upwelling below the depth of maximum zonal current regardless of different values of vertical eddy viscosity ranging from 1 to 50 cm2/sec. The meridional distribution of the zonally averaged vertical velocity above 200 m between 4°S and 4°N is determined by expanding the same equation of motion as well as equation of continuity into power series of the latitudes. The vertical velocity thus determined shows upwelling of 10-3 to 10-2 cm/sec and increases from the south to the north and with increasing eddy viscosity with the same range as above.View full abstractDownload PDF (4591K)
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