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Volume 10, Issue 5
Displaying 1-15 of 15 articles from this issue
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Shin-ichi Kaneko1955 Volume 10 Issue 5 Pages 325-333
Published: May 05, 1955
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSMultiple scattering observations have been carried out on 103 slow cosmic-ray μ-mesons coming to rest in G5 emulsions. The emulsions were coated, exposed and processed at a depth of about 17 m.w.e. underground. It is shown that the constant sagitta scheme recommended by the Göttingen group gives satisfactorily constant mean sagittae with increasing residual range at least in the region of velocity 0\lesssimβ\lesssim0.46. Observations of 81 μ-mesons are also described which were done by the scheme based upon the Williams theory of scattering and upon the range-energy relation given by Bradner et al. The error introduced by the use of schemes other than that of Göttingen is discussed. The results are compared with Glasser’s calibration experiment on 101 artificially produced slow protons.View full abstractDownload PDF (1256K) -
Takeo Hayashi, Mitsuhiro Kawamura, Atsushi Aoki1955 Volume 10 Issue 5 Pages 334-336
Published: May 05, 1955
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe directional correlation of successive gamma-rays from Ti46 was measured using RCA 5819 photomultiplier tubes with Nal(Tl) scintillation crystals as the detectors. The measurements were made by counting more than 50,000 genuine coincidence counts at each angle. It was found that the successive gamma-rays were both quadrupole and the spins of the ground, 1st and 2nd excited state should be 0.2 and 4, respectively.View full abstractDownload PDF (300K) -
Kiyoshi Murakawa1955 Volume 10 Issue 5 Pages 336-338
Published: May 05, 1955
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe hyperfine structure of the lines Mn I λ5432, λ5395 and λ4034 was measured, and the quadrupole moment of Mn55 was calculated to be (0.4±0.2)×10−24 cm2.View full abstractDownload PDF (392K) -
Hiroshi Fujiwara1955 Volume 10 Issue 5 Pages 339-346
Published: May 05, 1955
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe increase of electrical resistance due to the substitutional impurities of di- or trivalent metal for monovalent metal in dilute solid solution is calculated.
In the present paper, two steps are taken as follows:
First, a modified screened Coulomb field is exactly obtained from the Thomas-Fermi equation by numerical integration, and second, for the calculation of the cross section, the method of partial wave is used, instead of the Born approximation.
The agreement of theoretical results with experiment has been greatly improved by this method in comparison with the results obtained by the use of the Born approximation.View full abstractDownload PDF (908K) -
Kozo Komatsu1955 Volume 10 Issue 5 Pages 346-356
Published: May 05, 1955
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe previous theory by the author and Nagamiya (1951) is improved in this paper by introducing the shearing elastic constant c44, which is estimated by a procedure similar to that employed by Brennan. This shearing elastic constant couples the two types of vibrations, those normal to the hexagonal layers and those parallel. The theory shows that below 10°K the deviation from T2 law becomes appreciable and the range of transition from T2 to T3 laws appears at a few degrees absolute. The calculated values agree with the experimental ones over the whole temperature range below 60°K. Comments are given on recent other theories.View full abstractDownload PDF (1352K) -
Enji Uchida, Hisamoto Kondoh1955 Volume 10 Issue 5 Pages 357-362
Published: May 05, 1955
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSSusceptibility-temperature relation for the compound FeTe was measured over a range of temperatures between liquid air and 1150°C. Evidence was found of an antiferromagnetic character in the region of temperatures below 500°C, the molal magnetic susceptibility having been expressed by χ=0.92⁄(T+220). The effective number of Bohr magnetons was estimated to be 2.72. The susceptibility dependence on temperature in the region beyond 600°C showed evidences of the feeble constant paramagnetism and an anomaly at 815°C, which is the melting point of this compound. A tentative interpretation of these magnetic properties is given in terms of an electronic configuration of Fe.View full abstractDownload PDF (716K) -
Toshio Misawa1955 Volume 10 Issue 5 Pages 362-367
Published: May 05, 1955
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSAfter giving a brief review of the principles of the theory of the junction transistor, the emission efficiency of an efficient emitter is calculated in the electrostatic potential-imref scheme by extending the boundary conditions so as to apply to the case of the moderately high injection level. The electrostatic potential-imref diagram for this case is sketched. The obtained efficiency decrease is about one half of Webster’s and is the same as Rittner’s but the input characteristics are different from the latter.View full abstractDownload PDF (736K) -
Takeo Yokobori1955 Volume 10 Issue 5 Pages 368-374
Published: May 05, 1955
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSAfter limit of strain hardening, fatigue crack was assumed to form as a result of large tensile stress by a piled-up group of dislocations plus externally applied tensile stress component, with the aid of other stress concentration factor associated with the obstacle or inclusion itself. Nucleation theory was applied to the initiation of the crack. The theoretical S–N curve is in quantitative agreement with the data. The scatter of the number of cycles for fracture, which is an inherent characteristic of fatigue fracture, is, mostly if not wholly, explained as a stochastic phenomenon associated with nucleation process of the fatigue crack. The theoretical temperature dependence of fatigue strength is in fairly agreement with the data in literature.View full abstractDownload PDF (896K) -
Hiromu Wakeshima1955 Volume 10 Issue 5 Pages 374-380
Published: May 05, 1955
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSAn approximate but simple and general treatment of the time lag in self-nucleation is given. In this method the relation to be satisfied approximately by the rate of nucleation in non-steady state is obtained and solved without first seeking the distribution of embryos. This calculation, when applied to the problem of condensation of water vapor in a high degree of supersaturation, gives a time lag of the same order of magnitude as that obtained by Probstein who solved the problem in ordinary way. Time lag of self-nucleation in the case of transformation in a solid is also computed. Certain limitation has been set therefrom to the validity of the notion of “athermal nucleation” as proposed by Turnbull et al., which presumes a large temporary lagging in the change of embryo distribution when, e.g., metals are quenched in phase transformations.View full abstractDownload PDF (800K) -
Sohei Kondo1955 Volume 10 Issue 5 Pages 381-386
Published: May 05, 1955
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSCombining with a thermodynamical definition, an extension of Harasima’s statistical-mechanical method to calculate the plane surface tension leads to general expressions for the surface tension of cylindrical and spherical interface. A new definition of “surface of tension” is introduced and the familiar Kelvin relation is derived more strictly by using this definition than by the traditional method. From the point of view of this definition Tolman’s conclusion on the curvature dependency of surface tension turns out to be questionable and necessary to be reexamined.View full abstractDownload PDF (748K) -
Hisao Takayama, Koichi Shimoda1955 Volume 10 Issue 5 Pages 387-391
Published: May 05, 1955
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe use of miniature receiving tubes as electrometer tubes with large voltage gain and low grid current has been investigated. 6AK5 and 3S4 have been found to be appropriate. The grid current of a 3S4 has been reduced to 1×10−15A by proper treatments. Under the condition, the voltage gain of 20∼40 has been measured.View full abstractDownload PDF (520K) -
Kenji Mitani1955 Volume 10 Issue 5 Pages 391-397
Published: May 05, 1955
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe author has devised a new double probe method to investigate the microwave gas discharge. In this method, the electrodes of the cavity themselves can be used as probes, as he has practiced in the previous papers. Brown’s theory of the microwave discharge has applied to this method and a good agreement between theory and experiment has been found.View full abstractDownload PDF (668K) -
Hidenori Hasimoto1955 Volume 10 Issue 5 Pages 397-406
Published: May 05, 1955
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSContinuing the previous work I (J. Phys. Soc. Japan 9 (1954) 611), the author discusses the frictional force on an arbitrary cylinder which is started to move suddenly from rest with uniform velocity W in the direction of its length. By using the WKB method, a new asymptotic expansion formula in powers of \sqrtνt⁄R is derived for the frictional drag τ on the cylinder with no corners;
\fracτμW=\frac1\sqrtπνt+\frac12R−\frac\sqrtνt4\sqrtπR2+\fracνt8\left[\frac1R3+\frac∂2∂s2\left(\frac1R\ ight)\ ight]+O((νt)3⁄2)
where ν is the kinematic viscosity, t is the time measured from the start, R is the local radius of curvature of the surface measured inwards, and ds is the line element along the surface. The first approximation gives the naturally expected value μW⁄\sqrtπνt for the frictional drag per unit area, which is the same as that for a flat plate of infinite breadth. As far as the second approximation the total frictional drag on the cylinder is the same as that on a circular cylinder with the same perimeter, and is in accord with the results recently obtained by Batchelor. The effect of the variation of the curvature along the surface on the local friction first appears in the fourth order of approximation. The correction due to the presence of corners is made in the second approximation, and some errors in Batchelor’s paper are corrected. For the intermediate value of νt the drag calculated by these formulae shows a good agreement with that calculated by the formulae in powers of (νt)−1 as given in I.View full abstractDownload PDF (980K) -
Yorisaburo Takaisi1955 Volume 10 Issue 5 Pages 407-415
Published: May 05, 1955
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe steady slow motion of a circular cylinder in a semi-infinite viscous liquid bounded by a plane wall is discussed on the basis of Oseen’s linearized equations of motion, assuming that the cylinder is moving parallel to the bounding wall. The forces acting on the cylinder are calculated to Lamb’s approximation. By carrying out detailed numerical calculations, it is shown that at sufficiently small Reynolds numbers the drag on the cylinder is of the Stokes type, as in the case of White’s experiments on metal wires moving with low speeds in a viscous liquid bounded by two parallel Plane walls.
It is also shown that the cylinder experiences a repulsive force from the bounding wall.View full abstractDownload PDF (784K) -
Shigeya Kuwabara1955 Volume 10 Issue 5 Pages 416
Published: May 05, 1955
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (120K)
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