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Volume 13, Issue 1
Displaying 1-20 of 20 articles from this issue
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Tsunesaburo Asada, Masayoshi Masuda, Masayuki Okumura, Juzo Okuma1958 Volume 13 Issue 1 Pages 1-4
Published: January 05, 1958
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe angular distributions of photo-neutrons from lead, copper, aluminum and beryllium have been measured by using bremsstrahlung of maximum energy of 17 Mev from a betatron. The neutron detector is ZnS-paraffin-Lucite light guide button. The results are 1+(1.29±0.53)sin2θ, 1+(1.6±0.8)sin2θ, 1+(0.17±0.06)sin2θ, 1+(0.30±0.11)sin2θ for beryllium, aluminum, copper, and lead.View full abstractDownload PDF (448K) -
Tosio Sakurai, Masaya Yabe1958 Volume 13 Issue 1 Pages 5-15
Published: January 05, 1958
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA phase transformation of normal hexadecanamide (C15H31CONH2) in which the crossed hydrocarbon chain configuration changes into the parallel-chain one is investigated by means of X-rays, thermal analysis, infrared absorption and proton magnetic resonance absorption. Based upon the knowledge of the crystal structure and X-ray observation, a mechanism of successive reorientation of the hydrocarbon chain at this transformation is proposed. The twisting vibration of the hydrocarbon chain is found to play an important role for this transformation.View full abstractDownload PDF (1620K) -
Kiyoshi Yonemitsu, Takao Sato1958 Volume 13 Issue 1 Pages 15-22
Published: January 05, 1958
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSTemperature dependence of Hall coefficient of three superlattice alloys of Mg–Cd system, Mg3Cd, MgCd and MgCd3, was measured to find the effect of order-disorder transformation upon it. At the transformation temperature, the Hall coefficient of these alloys showed a discontinuous increase in positive direction, while the electrical resistivity, which was measured simultaneously, decreased discontinuously at that temperature.
It is discussed that the change of Brillouin zone structure due to the order-disorder transformation of these alloys might be considered to be the origin of such a change of the Hall coefficient.View full abstractDownload PDF (876K) -
Sh\={o}ji Tanaka, Taiz\={o} Masumi1958 Volume 13 Issue 1 Pages 22-32
Published: January 05, 1958
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSAn experiment on the changes of photocurrent in cadmium sulphide single crystals in magnetic field was performed. The results obtained are as follows; the changes of photocurrent by magnetic field are dependent on the strength of electric and magnetic fields which are parallel to the illuminated surface and are perpendicular to each other, and the changes are also dependent on the frequency of the alternating electric field, the wavelength of illuminating light and on the ambient atmosphere, while these changes are independent of the intensity of illuminating light. Some theoretical treatments based on the phenomenological theory of surface recombination are proposed with these experimental results, and they seem to give some informations about surface recombination of cadmium sulphide single crystals.View full abstractDownload PDF (1288K) -
Hazimu Kawamura, Keiko Ishiwatari1958 Volume 13 Issue 1 Pages 33-36
Published: January 05, 1958
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSAn experiment on the electron spin resonance of colored KCl containing F and M centers was performed at 9500 Mc/sec. Subtracting the contribution from the F centers from the observed resonance curve, we could estimate the shape of the resonance line due to M centers alone, which was found to be Gaussian with the half-breadth of 48 oersteds and g value of 2,000. This result was discussed on the LCAO model.View full abstractDownload PDF (588K) -
Yoshikazu Ishikawa1958 Volume 13 Issue 1 Pages 37-42
Published: January 05, 1958
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSD.C. electrical conductivity and Seebeck voltage of the synthesized solid solution x FeTiO3·(1−x)Fe2O3 of ilmenite (FeTiO3) and hematite (Fe2O3) were measured for a composition range of 1≥x≥0.33. It was found that both conductivity and Seebeck voltage change continuously with the composition. At room temperature, the conduction is that of p type for x>0.73 and n type for x<0.73. Judging from these results, it was concluded that the valence state of Ti ions in the compound is tetravalent for the whole range of composition. Conductivity of all specimens obeys a simple Wilson’s formula σ=σ0exp(−E⁄2kT) over a temperature range from 200°K to 970°K with two or three activation energies for each specimen. No anomalous change of conductivity could be observed at the ferrimagnetic or antiferromagnetic Curie point. It was, therefore, expected that the conduction electrons do not correlate with the magnetic spins in these compounds. Conductivity and Seebeck voltage of both ordered (ferrimagnetic) and disordered (antiferromagnetic) specimens with the same composition were compared. It was found that change of the ion arrangement does not affect electrical properties of these compounds.View full abstractDownload PDF (832K) -
Absorption Coefficients of Fine Structures of X-ray Absorption Spectra at Various Absorber ThicknessKenjiro Tsustumi, Masayoshi Obashi, Masao Sawada1958 Volume 13 Issue 1 Pages 43-50
Published: January 05, 1958
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSBy using the North American Philips Diffraction Unit and Wide Range Goniometer modified to a tube spectrometer described by Coster and De Lang, the fine structures of X-ray K absorption spectra of copper in metallic copper, CuCl2·2H2O, CuSO4·5H2O and cobalt in CoCl2·6H2O at various thickness were measured. The structures near the absorption edges are affected by the absorber thickness. The mass absorption coefficients of maximum absorption jumps become large with decreasing absorber thickness, and the small maximum and ninimum near the absorption edges also become indistinct with increasing absorber thickness. The wavelengths of these structures are slightly affected. This is due to the finite resolving power of the spectrometer and the tail of the spectral window as mentioned by Parratt. In the high energy regions from the absorption edges the absorption coefficients are not affected by the absorber thickness.View full abstractDownload PDF (2432K) -
Kinya Katada1958 Volume 13 Issue 1 Pages 51-58
Published: January 05, 1958
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSAn improved procedure is described for determining the molecular structures from electron diffraction data of gases by the radial distribution method. By this procedure the structural data can be straight-forwardly obtained from the radial distribution function derived from the observed intensity data without any assumption on the structure and disregard of the effect of non-nuclear scattering.
The radial distribution function derived here is the sum of the nuclear distribution function and the additional terms which have the same forms as the former. A method of the analysis of the radial distribution curve is developed by use of the moments of the distribution function.
In addition, Karle and Karle’s procedure is discussed and errors involved there are estimated.View full abstractDownload PDF (972K) -
Sh\={u}ichi Iida, Hisashi Sekizawa, Yoshimichi Aiyama1958 Volume 13 Issue 1 Pages 58-71
Published: January 05, 1958
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe uniaxial anisotropy induced by the magnetic annealing in both single and poly-crystals of iron-cobalt ferrites has been studied experimentally. It is shown that the magnitudes of the uniaxial anisotropy depend essentially on the degree of oxidation of the specimens and become almost zero after deoxidizing heat treatments. Contrary to the conclusion by Bozorth et al., the dependence of the magnitude of the uniaxial anisotropy on the direction of the annealing magnetic field is observed for a cobalt rich single crystal, showing a maximum along ⟨100⟩ and a minimum along ⟨110⟩ in (001) plane. Relaxation behaviour of the uniaxial anisotropy is studied by measuring directly the change of torque at high temperatures (240°C∼350°C) with a polycrystalline cobalt ferrite. It has been found that the results can be described by a simple empirical formula, supporting that the magnetic annealing effect has no critical temperature. The variation of electrical conductivity with temperature has also no anomaly at the effective temperature range.
Considering all the experimental results obtained, we have reached the conclusion that the uniaxial anisotropy in these ferrites is due to the presence of directional short range order among various cations and cation vacancies in the spinel matrix. The nearest neighbour pair of a cobalt ion and a vacancy seems to play a principal role in this mechanism.View full abstractDownload PDF (1748K) -
Yushiro Saito1958 Volume 13 Issue 1 Pages 72-78
Published: January 05, 1958
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSExperiments on nuclear magnetic double resonance were performed in several ionic crystals of type AB where the resonance behavior of the A-spin was investigated under the irradiation of strong rf field resonating to the B-spin. At the strongest rf field experimented, narrowing of the line width was observed and this fact showed evidently that the local field at the position of A-spin originating from B-spin was averaged out to zero. By using this principle the origin of the anomalously broad line width in TlBr crystal was pursued. The experimental results supported our suggestion that the broad line width would be attributable to the indirect nuclear spin-spin coupling. The second moment of the line width in double resonance calculated by the use of rotating coordinate system was in agreement with the experimental value.View full abstractDownload PDF (1016K) -
Hiromi Yamakawa, Michio Kurata1958 Volume 13 Issue 1 Pages 78-86
Published: January 05, 1958
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSStatistical properties of a single polymer-chain in a continuous medium are studied on the basis of the pearl-necklace model. Proper account is taken of the spatial interference between segments and of the effect of a heat of interaction between solvent and polymer. The 2m-th moment of the distribution function of the distance between k-th and l-th segments ⟨Rkl2m⟩, the mean square distance between k-th segment and the molecular center of mass ⟨Sk2⟩, and the mean square radius of gyration ⟨S2⟩ are calculated by using Ursell-Mayer-Tera-moto’s method of expanding the chain phase integral. The results obtained are of non-Markoffian character at any temperature but the Flory point, and are qualitatively in consistency with the experimental data of lattice chain obtained by direct counting of its configurations. The angular distribution of scattered light is also calculated and a method is proposed to evaluate ⟨S2⟩ by the dissymmetry method.View full abstractDownload PDF (896K) -
Hiromi Yamakawa1958 Volume 13 Issue 1 Pages 87-94
Published: January 05, 1958
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA statistical-mechanical theory of dilute polymer solutions is developed following the solution theory of McMillan and Mayer, and the osmotic second virial coefficient A2 is calculated taking account of the intra- and intermolecular interactions. The final expression for A2 is expressed in terms of the molecular constants such as the molecular weight, segment size and bond length. The molecular weight dependence of A2 is improved at least in the vicinity of the Flory point in comparison with the theories of Flory-Krigbaum and Isihara-Koyama.View full abstractDownload PDF (796K) -
Hiromi Yamakawa, Michio Kurata1958 Volume 13 Issue 1 Pages 94-100
Published: January 05, 1958
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA theory of the intrinsic viscosity [η] of chain polymer solutions is developed on the basis of the Kirkwood and Riseman scheme, taking some modifications concerning the excluded volume effect into account. If the volume effect is represented by the linear expansion factor α of the root mean square radius of gyration, it is concluded that [η] is proportional to α2 for the free-draining molecule and α2.43 for the non-free-draining molecule. This implies that the effective hydrodynamic radius of the polymer coil is not proportional to the statistical one in the limit, where the rigid sphere model is asymptotically valid; in other words, the more the polymer chain is expanded, the deeper the solvent molecules penetrate into the polymer coil.View full abstractDownload PDF (744K) -
Kiyoshi Murakawa1958 Volume 13 Issue 1 Pages 101-108
Published: January 05, 1958
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe hyperfine structure (hfs) of the spectrum of Nb I was studied by means of a liquid-air-cooled hollow cathode discharge tube and a Fabry-Pérot etalon. The quadrupole moment of Nb93 was deduced to be −0.29 barn and −0.20 barn (1barn=10−24 cm2) from the levels 4d35s2 4F3⁄2 and 4d45s 6D3⁄2 respectively, in which no shielding correction is included. Assuming that the shielding correction in this case is zero, we get Q(Nb93)=−0.25±0.15 barn.
The interval factors of the levels 4d35s2 4F3⁄2,5⁄2,7⁄2,9⁄2 and 4d45s 6D3⁄2,5⁄2,7⁄2,9⁄2 were measured and compared with hfs formulas, and a small but definite discrepancy was detected.View full abstractDownload PDF (980K) -
Hiroshi Sat\={o}1958 Volume 13 Issue 1 Pages 108-111
Published: January 05, 1958
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe information capacity of a coloured picture is obtained taking into account the restriction inherent to the human perception of colour. Calculations are made concerning a one-dimensional picture, and the result is used as an upper bound for the capacity of a two-dimensional picture.View full abstractDownload PDF (472K) -
Takayoshi Okuda, Kenzo Yamamoto1958 Volume 13 Issue 1 Pages 112-113
Published: January 05, 1958
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (152K) -
Susumu Takeda1958 Volume 13 Issue 1 Pages 113-114
Published: January 05, 1958
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (124K) -
Shoichiro Nomura, Jinzo Kobayashi1958 Volume 13 Issue 1 Pages 114
Published: January 05, 1958
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (148K) -
Saburô Asaka1958 Volume 13 Issue 1 Pages 115B
Published: January 05, 1958
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSIn equation (5.10) on page 487,
eleventh line from the bottom (4/3π3){2(1+····
should be (4/3π3){4(1+····
seventh line from the bottom ····+6ν2}[····
should be ····+16ν2}[····
The author is indebted to Dr. John R. Spreiter for pointing out these errors. They are mistakes in printing and the numerial results in § 6 are not affected by these errors.View full abstractDownload PDF (28K) -
Otohiko Nomoto, Tadashi Kishimoto1958 Volume 13 Issue 1 Pages 115A
Published: January 05, 1958
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe words “sugars” and “saccharides” in this paper must be replaced by “sugars and polyhydric alcohols”, and “sugar solutions” by “solutions of sugars and polyhydric alcohols”, because erythrite and mannite are polyhydric alcohols.View full abstractDownload PDF (20K)
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