All issues
Volume 48 (1980)
- Issue 6 Pages 1797-
- Issue 5 Pages 1407-
- Issue 4 Pages 1055-
- Issue 3 Pages 711-
- Issue 2 Pages 351-
- Issue 1 Pages 1-
Predecessor
- Proceedings of the Physico-Mathematical Society of Japan. 3rd Series
- Proceedings of the Tokyo Mathematico-Physical Society. 2nd Series
- Tokyo Sugaku-Butsurigakukwai Kiji-Gaiyo
- Tokyo Sugaku-Butsurigakkwai Hokoku
- Tokyo Sugaku-Butsurigaku Kwai Kiji
- Tokyo Sugaku-Butsurigaku Kwai Kiji
- Tokyo Sugaku Kaisya Zasshi
Volume 48, Issue 3
Displaying 1-50 of 55 articles from this issue
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Yoko Miyatake1980 Volume 48 Issue 3 Pages 711-719
Published: March 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe results of the β-γ directional correlation measurement of the first-forbidden β-transition of 149Pm showed a slight energy dependence in the reduced β-coefficient ratio, R(Ei)⁄R(Ek), impling a deviation from the ξ-approximation. The analysis is based on the theoretical expressions given by Morita and Morita and performed by the minimization of χ2 for the directional correlation coefficient ratio, A2(Ei)⁄A2(Ek). Two sets of the nuclear matrix parameters and corresponding values of the γ-coefficient, A2γ, and E2 mixing of the 286 keV transition were found: set I, x=−0.119±0.140, u=−1.545±0.160, y′=−15.46±1.57, A2γ=0.09±0.12, 0.2%<E2<3.1%; set II, x=0.795±0.136, u=−1.363±0.126, y′=23.41±1.42, A2γ=−0.61±0.11, 19.4%<E2<37.8%. Set I is tentatively preferred. The deviation from the ξ-approximation is interpreted in terms of the effect of cancellation among the parameters.View full abstractDownload PDF (1076K) -
Seigo Koh, Koichi Nakayama, Minoru Tsuda, Toshifumi Hayashi, Yasutoshi ...1980 Volume 48 Issue 3 Pages 720-727
Published: March 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe 26Mg(d, p)27Mg neutron stripping reaction has been studied at 3.1 and 3.5 MeV. Product protons corresponding to levels up to 4.8 MeV in 27Mg were analysed with the broad range magnetic spectrograph with peak widths of ∼7 keV (FWHM) at eight angles from θ=15° to θ=120°. Cross sections are analysed using the DWBA theory and the statistical theory of Hauser and Feshbach. The angular momentum transfers ln are determined undoubtfully. The spectroscopic factors for respective states are then compared with the shell model calculations of Wildenthal et al. and the predictions of the collective model.View full abstractDownload PDF (896K) -
Osamu Sakai1980 Volume 48 Issue 3 Pages 728-737
Published: March 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe electronic structure in the mixed valence state in the case that one of two different valence states has a singlet LSJ level is studied here. This study is based on the multisite Friedel-Anderson model with the spin-orbit interaction. The alloy analogy of Hubbard is used to treat the effects of strong correlations. The susceptibility is calculated as a function of temperature. It has a maximum at a low temperature and is finite as T→0 K. A gap or a dip appears around the f level in the density of states of the conduction electrons.View full abstractDownload PDF (1044K) -
Yoshitsugu Oono, Tohru Kohda, Hideki Yamazaki1980 Volume 48 Issue 3 Pages 738-745
Published: March 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSAs a possible dual concept of the order parameter in the theory of phase transition, it is desirable to introduce the disorder parameter for chaos. A mathematically well-defined disorder parameter is proposed, which is presumably identical with the Kolumogorov entropy, though rigorous proof is not yet obtained. Possible potential applications of the disorder parameter to the analyses of time-series are given.View full abstractDownload PDF (1076K) -
Minoru Takahashi1980 Volume 48 Issue 3 Pages 746-750
Published: March 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSIt is shown that the motion of the plane rotator model should be described by a set of equations
(Remark: Graphics omitted.), i=1, 2, ···, N,
and that the Hamiltonian should be
(Remark: Graphics omitted.).
To this Hamiltonian one can apply the method of molecular dynamics. For the case of the nearest neighbor interaction, energy-temperature curve is calculated for one, two and three dimensions. In one dimension our result agrees well with the exact solution. In two dimension a sharp peak of specific heat is found at T∼1.1 J⁄k. In three dimension a singularity is observed at T∼2.2 J⁄k.View full abstractDownload PDF (548K) -
Koji Muramatsu, Takehiko Oguchi1980 Volume 48 Issue 3 Pages 751-756
Published: March 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSCluster approximation for the antiferromagnets is improved by extending the effective Hamiltonian method so that there appears no anti-Néel point. It is applied to the S=1⁄2 antiferromagnet on a square lattice with anisotropic exchange interaction which includes the anisotropy parameter η. This system is reduced to the Heisenberg model or to the Ising model according as η goes to 1 or 0. The variations of the Néel point TN and the specific heat with η are calculated. The results of the specific heat curves for η\gtrsim0.9 exhibit a broad maximum above TN where a small spike appears.View full abstractDownload PDF (660K) -
Katsuyuki Awa, Takashi Asahi1980 Volume 48 Issue 3 Pages 757-761
Published: March 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe effect of correlations on polarizations in an electron gas is studied. The proper polarization is constructed from direct- and exchange-processes consisting of particle-particle ladder-vertices with a screened interaction. The short-wavelength behavior of the so-called local field correction G(p) is discussed.View full abstractDownload PDF (540K) -
Theorems Relating to Catastrophe Indices and to the “Fourth” Checkpoint for Second-Order TransitionsKêitsiro Aizu1980 Volume 48 Issue 3 Pages 762-765
Published: March 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSFirstly the meaning of catastrophe indices and of the “fourth” checkpoint for second-order transitions are explained over again. And then three new theorems are presented. The first of them is most fundamental from which the two others follow. The second theorem is: The catastrophe indices of a transition parameter system always include a unity. The third theorem is: If the dimensionality of the irreducible representation for the transition parameters is lower than 3, the transition from the prototypic to a ferroic phase always passes the “fourth” checkpoint.View full abstractDownload PDF (500K) -
Yasuaki Hiwatari, Akira Ueda1980 Volume 48 Issue 3 Pages 766-772
Published: March 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA simple version for superionic conductors, of the soft-core model for simple liquids is proposed. That is, the model potential is composed of only the soft-core and the Coulomb potentials. Monte Carlo simulations for α-AgI are made with a fine-grained lattice for a 108-ion system at several temperatures. Sublattice disordering of cations is observed for an appropriate temperature range. At lower temperature the bcc lattice of anions becomes unstable and changes to an fcc-like structure, and at the same time cations show almost localized motions. These results are consistent with the experiments for AgI. The characteristics of the resulting structural properties for cations are also found to be consistent with the recent experimental results.View full abstractDownload PDF (996K) -
Masaki Aihara1980 Volume 48 Issue 3 Pages 773-779
Published: March 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWe investigate the time-dependent polarization characteristics associated with resonance Raman scattering in a linearly-coupled localized-electron phonon system with a doubly-degenerate excited electronic level. It is found that the temporal polarization behavior for the pulse excitation strongly reflects the dynamics of the electron-phonon interaction in the intermediate state. In the case of a short pulse limit, the time-dependent degree of polarization (DP) exhibits the damped oscillation which is directly related to the dynamical motion of the interaction mode. For a square pulse with a finite pulse width, the interference effect between the scattering and the luminescence appears in the oscillatory behavior of DP during the excitation, and strongly depends on the incident photon energy.View full abstractDownload PDF (812K) -
Kenji Takanaka, Tomitaro Nagashima1980 Volume 48 Issue 3 Pages 780-785
Published: March 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA theoretical investigation has been carried out of the magnetization M of type-II superconductors with cubic crystal symmetry. An explicit expression for M is obtained near the transition temperature Tc in the case where the applied field is slightly smaller than the upper critical field Hc2. The obtained expression for M consists of two cubic harmonics.
From consideration of the free energy, it is shown in a unified manner that the components of the magnetization parallel and perpendicular to the applied field H0 are related to the anisotropy of the upper critical field Hc2 or the lower critical field Hc1 when H0∼Hc2 or H0∼Hc1 irrespective of the temperature.View full abstractDownload PDF (568K) -
Shinji Wada, Syunzaburou Nakamura, Ryozo Aoki, Philippe Molinie1980 Volume 48 Issue 3 Pages 786-792
Published: March 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMeasurements of the 181Ta and 93Nb spin-lattice relaxation time T1 at low temperatures are reported for the 2H polytypes of TaS2 and NbS2 and their pyridine intercalation compounds. An analysis of T1T shows that, on the intercalation of pyridine molecules, the density of states at Fermi level N(EF) increases about 30% for 2H-TaS2, while decreases about 30% for 2H-NbS2. This is suggestive of charge transfer from pyridine molecules to dz2 conduction band of the disulfides.View full abstractDownload PDF (788K) -
Masakazu Ichiyanagi1980 Volume 48 Issue 3 Pages 793-798
Published: March 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA Boss system has two broken symmetries, namely the gauge symmetry and the Galilei translation symmetry. We discuss the microscopic background of the ansatz that the superfluid flow is the manifestation of the local gauge invariance. To do this we show that the depletion velocity fields are the Goldstone fields due to the breakdown of the Galilei translation symmetry. A connection between a Bose-Einstein condensation and superfluid flow is also discussed.View full abstractDownload PDF (748K) -
Kazushige Machida, Takeo Matsubara1980 Volume 48 Issue 3 Pages 799-804
Published: March 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSPossible magnetic instability in magnetic superconductors is studied by calculating the wave number dependent susceptibility χ(q) in the presence of superconductivity. Effects of Fermi surface nesting on χ(q) are examined for three models: Free electron gas model and tightly binding cosine band model of one-dimension, and Liu’s model for imperfect nesting. All model calculations reveal that stable magnetic ordering which coexists with superconductivity is antiferromagnetic one. Possibility of an incommensurate spin density wave state is discussed.View full abstractDownload PDF (624K) -
Masao Shimizu1980 Volume 48 Issue 3 Pages 805-813
Published: March 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe origin of the magnetic inhomogeneity in Fe–Ni Invar alloys is attributed to the first-order magnetic transition, which was predicted before in the itinerant electron model. The large effect of the magnetovolume coupling on various thermodynamic properties is examined in the model of magnetic mixing of the ferromagnetic phase with larger atomic volume and the paramagnetic phase with smaller atomic volume. At low temperatures the mixing is assumed to be frozen in. The mutual transformation between the ferromagnetic and paramagnetic phases due to the changes of temperature, magnetic field and pressure give additional contributions to the respective thermodynamic properties. The difference between the observed values of the field derivative of the volume and the pressure derivative of the magnetization is discussed. The experimental results of various thermodynamic properties in Fe–Ni Invar alloys are analyzed in connection with the present theoretical results and are satisfactorily explained.View full abstractDownload PDF (1152K) -
Shoji Ishida, Yasunori Kubo, Junji Ishida, Setsuro Asano1980 Volume 48 Issue 3 Pages 814-821
Published: March 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSIn order to see the characteristic properties of the ferromagnetic Heusler alloys,the electronic structures of Ni2MnSn and Pd2MnSn have been calculated. The common properties of these alloys have been discussed by the present results and those obtained for Cu2MnAl. The spin polarizations of the constituent atoms are in good are in good agreement with experimental ones. The signs of the spin polarizations of the s-type conduction electrons in the inscribed spheres are consistent with the signs of the measured internal magnetic fields due to the conduction electrons.View full abstractDownload PDF (800K) -
When Shan Chan, Katsuya Mitsuoka, Hideki Miyajima, Soshin Chikazumi1980 Volume 48 Issue 3 Pages 822-829
Published: March 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSSaturation magnetization, Curie temperature, magnetocrystalline anisotropy and magnetostriction were measured for M1−cTic (M=Fe, Co, Ni) systems. The rate of change in saturation magnetic moment dμ⁄dc at 0 K was found to be −6.2 μB and −4.3 μB per atom in Co–Ti and Ni–Ti systems, respectively. For Fe–Ti system the decrease in magnetic moment was non-linear. Curie temperatures of Ni–Ti system decrease monotonically at the rate of −42 K per atomic percent Ti and those of Fe–Ti system increase linearly at the rate of +3.7 K per atomic percent Ti. Magnetostriction and magnetocrystalline anisotropy of Fe–Ti system also increase with increasing Ti concentration.View full abstractDownload PDF (788K) -
Hidetoshi Hiroyoshi, Akira Hoshi, Hiroyasu Fujimori, Yasuaki Nakagawa1980 Volume 48 Issue 3 Pages 830-835
Published: March 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMagnetizations of pure Ni, 10 at% Cu–Ni, 10 at% Co–Ni, 46 at% Fe–Ni and amorphous 16 at% B–Fe alloys have been measured in static magnetic fields up to 100 kOe in the temperature range around the Curie points. The relation between magnetization M, field H and temperature T is satisfactorily fitted to an equation (H⁄M)0.75=a(T−Tc)+bM2.5 for all the alloys investigated, where a and b are constant parameters and Tc is the Curie temperature. Accordingly, isotherms of the Arrott-Noakes plots, M2.5 vs (H⁄M)0.75, are parallel straight lines.View full abstractDownload PDF (676K) -
Kohji Eguchi, Hironobu Fujii, Akio Mishima, Hiroshi Fujiwara, Tetsuhik ...1980 Volume 48 Issue 3 Pages 836-842
Published: March 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMeasurements of the magnetization and the magnetic susceptibility have been made along the principal axes of Dy–Th single crystal alloys with the hexagonal close-packed structure. The alloys exhibit a ferromagnetic structure at low temperatures in all composition region and screw antiferromagnetism appears in the sequence of the increase of the temperature in the composition less than about 12 at% Th. Magnetic transition temperatures Tc and TN increase and decrease with increasing Th concentration, respectively. The magnetocrystalline anisotropy constant K20 was determined from the analysis of the hard magnetization curve. And the exchange interaction constant j(Q) was determined from the magnetic transition temperatures, and j(0) and the magnetocrystalline anisotropy constant K20 para in the paramagnetic state were also determined from the analysis of the paramagnetic susceptibility, respectively, on the basis of the molecular field theory.View full abstractDownload PDF (704K) -
Fumihisa Ono1980 Volume 48 Issue 3 Pages 843-849
Published: March 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSDisordered Fe–Pt Invar alloys (around 30 at% Pt) show anomalous properties in both temperature and magnetic field dependences of the magneto-crystalline anisotropy constant K1. A theory has been proposed based on the itinerant electron model by assuming a strong relationship between K1 and the Fermi level of the minority spin band. The temperature dependence of K1 can be explained by using the present theory. The decrease of the absolute value of K1 with increasing the external field can also be explained by the present theory.View full abstractDownload PDF (896K) -
Nozomu Inoue, Hiroshi Yasuoka, Shinji Ogawa1980 Volume 48 Issue 3 Pages 850-856
Published: March 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe magnetic properties of a pyrite compound NiSe2 have been investigated by the 77Se NMR, the magnetic susceptibility and the specific heat measurements in the temperature range between 1.6 and 300 K. The electronic specific heat coefficient, γ, is obtained to be (8.5±1.0) mJ/K2mol. The values of the magnetic susceptibility and the Knight shift are estimated to be 2.17×10−4 emu/mol and +(1.0±0.1)%, respectively, both being independent of temperature. The product of the nuclear spin-lattice relaxation time and temperature, T1T, is found to be constant with a value or 240 msec K. From these results, it is concluded that NiSe2 is one of the typical Pauli paramagnets and the usual Korringa relation holds with a relatively small exchange enhancement effect. Discussions of the origin of the hyperfine coupling constant of 77Se are also given in conjunction with the reported result of CoSe2.View full abstractDownload PDF (924K) -
Gendo Oomi1980 Volume 48 Issue 3 Pages 857-864
Published: March 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe γ–α transition pressure (Pγ–α), temperature (Tγ–α), and critical point (Pc, Tc) of Ce1−xLax alloys (x=0.0∼0.03) were determined by electrical resistivity measurements under pressure up to 10 kbar at temperatures between 50 K and 300 K. A nonlinear dependence of Tγ–α on pressure was confirmed for x=0.0 and 0.02 in agreement with the theory for x=0.0 by Miyamoto and Nagamiya (MN) rather than that by Ramirez and Falicov (RF). The impurity effects of lanthanum on Pγ→α, Tγ→α, and Tα→γ were determined experimentally: ∂Pγ→α⁄∂x=(0.37±0.06)kbar/(at.%La), ∂Tγ→α⁄∂x=−(12.5±1)K/(at.%La) and ∂Tα→γ⁄∂x=−(12±1)K/(at.%La) respectively. These experimental results were found to be in qualitative agreement with the calculated results by an extension of the MN theory.View full abstractDownload PDF (1040K) -
Shojiro Mori, Tsuneya Ando1980 Volume 48 Issue 3 Pages 865-873
Published: March 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSLow temperature mobilities parallel to the layers of a heavily doped n-type GaAs-Ga1−xAlxAs superlattice are calculated as a function of carrier concentrations. Assumed scattering mechanisms are Coulomb scattering from donor ions and surface roughness scattering at the interface. The subband structure in the presence of the band bending is calculated by the variational method. The surface roughness scattering is shown to be relatively unimportant and the Coulomb scattering is dominant. The mobility in the modulation doping case becomes nearly one order of magnitude larger than that in the uniform doping case in agreement with recent experiments. The band bending effect is important in the modulation doping case and reduce the mobility at large carrier concentrations. The intersubband scattering greatly reduces the mobility when electrons occupy higher subbands.View full abstractDownload PDF (1132K) -
Masayoshi Yamada, Tatsutetsu Shirai, Keiichi Yamamoto, Kenji Abe1980 Volume 48 Issue 3 Pages 874-881
Published: March 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe first observation of thermal Brillouin spectra in CdIn2S4 single crystals has been made at room temperature by using a sensitive photon-counting system, a piezoelectrically scanned Fabry-Perot interferometer and a He–Ne laser with the radiation wavelength of 632.8 nm. Brillouin doublets by acoustic phonons propagating along the [1, 0, 0], [1, 1, \sqrt2] and [\sqrt2+1, 1, 0] directions are observed at the 90°-scattering configuration and assigned to specific modes of vibration according to the polarization selection rule in Brillouin scattering. The elastic constants are determined from Brillouin shifts. The absolute photoelastic constants are obtained by the comparison of Brillouin intensities measured in CdIn2S4 with those in fused quartz under the same experimental conditions. The results are: C11=12.15±0.10, C12=2.46±0.46, and C44=2.57±0.05 in unit of 1010 N/m2, and P11=0.027±0.006, P12=0.093±0.005, and P44=−0.033±0.002.View full abstractDownload PDF (956K) -
Tsutomu Nakamura, Masaru Kasahara, Itaru Tatsuzaki1980 Volume 48 Issue 3 Pages 882-885
Published: March 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSProton spin-lattice relaxation time T1 was measured in the temperature range from 10 to −170°C. Results obtained in the paraelectric phase were analyzed by assuming that the relaxation is caused by three mechanisms: diffusion motion of H2O molecules, the hindered rotation of CH3 and NH3 radicals and the fluctuation of the local magnetic field which increases near the phase transition temperature owing to the critical slowing down of the order parameter. The relaxation rate caused by the third mechanism was found to depend on temperature as ln (T−T0), where T0 is the paraelectric Curie temperature.View full abstractDownload PDF (496K) -
Kazuo Gesi1980 Volume 48 Issue 3 Pages 886-889
Published: March 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDielectric constants were measured for the pseudo-hexagonal c-plates of K3H(SO4)2, Rb3H(SO4)2, and their deuterated analogues below room temperature. The dielectric constants of K3H(SO4)2 and Rb3H(SO4)2 monotonically increase with decreasing temperature down to 4.2 K showing no anomalies correspoinding to phase transitions. On the other hand, the dielectric constants of K3D(SO4)2 and Rb3D(SO4)2 show λ-type anomalies at 84 K and 71 K, respectively. The results indicate that the deuteration in these compounds promotes phase transitions in low temperature region.View full abstractDownload PDF (424K) -
Mamoru Tanibayashi1980 Volume 48 Issue 3 Pages 890-897
Published: March 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSPolarization of NaCl crystals was measured by vibrating it as a cantilever. From the wave form of the potential difference caused by polarization, a new model of dislocation motion was proposed. The changes of the magnitude and the wave form of the induced voltage were interpreted with this model and satisfactory agreements were obtained.View full abstractDownload PDF (1052K) -
Kenji Akiyama, Yoshiyuki Morioka, Ichiro Nakagawa1980 Volume 48 Issue 3 Pages 898-905
Published: March 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSPolarized Raman and infrared reflection spectra of KNO3 crystals have been measured at room temperature. Raman and infrared transmission spectra of the high temperature phase of KNO3 have been also measured. The frequencies of the transverse (TO) and longitudinal (LO) modes of the infrared active vibrations of the crystal have been obtained from the observed reflectivities. The lattice dynamical analysis of the optical active vibrations of the room temperature phase of KNO3 has been made based on a rigid ion model which includes effective ionic charges and short-range repulsive force constants. Short-range force constants for the non-bonded metal-oxygen and oxygen-oxygen interactions have been determined by the least squares method using the observed Raman frequencies.View full abstractDownload PDF (864K) -
Katsutoshi Aoki, Osamu Shimomura, Shigeru Minomura, Naoki Koshizuka, T ...1980 Volume 48 Issue 3 Pages 906-911
Published: March 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe first-order Raman spectra of trigonal Se and Te have been measured under pressure up to the semiconductor-metal transition points at room temperature. In both materials, a prominent pressure effect is found as an anomalous shift of the A1 mode to low frequency. This softening indicates interference of the interchain bonding with the intrachain covalent bond. Frequency shifts with pressure show deviations from the lattice dynamical homology of Se and Te. The results are interpreted as aspects of the transition to the puckered layer structure of the high-pressure monoclinic phase of Te.View full abstractDownload PDF (696K) -
Mitsuo Kataoka, Yasuo Endoh1980 Volume 48 Issue 3 Pages 912-921
Published: March 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIn order to elucidate the properties of the cooperative Jahn-Teller effect, the diffuse scattering above the transition temperature has been studied both theoretically and experimentally. The correlations between the triply and the doubly degenerate electronic states interacting with each other via lattice vibrations are discussed on the basis of the static Jahn-Teller effect. Satisfactory explanations are given for both the X-ray experiments on NiCr2O4 made by Terauchi et al. and our neutron experiments on Fe2TiO4 where Ni2+ and Fe2+ in the tetrahedral sites have electronic ground orbitals of triplet and doublet respectively. The role of vibrational optic modes in the electronic interaction and the applicability of the static Jahn-Teller effect are discussed.View full abstractDownload PDF (1240K) -
Kazuyoshi Yamada, Yasuo Endoh, Yoshikazu Ishikawa, Noboru Watanabe1980 Volume 48 Issue 3 Pages 922-929
Published: March 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe structures of Ge rich amorphous Fe–Ge and Ni–Ge alloys were studied by pulsed neutron total scattering. The partial structure factors of SGeGe(Q), SNiGe(Q) and SNiNi(Q) were determined successfully by using Ni60 isotope for the Ni–Ge alloys. The Ge atoms in the 10 at% Ni–Ge amorphous alloy were found to construct a similar atomic structure as that of the amorphous Ge, while the intermediate short range order configuration between the tetrahedral random network (TRN) and the dense random packing (DRP) structure was found for the 30 at% Ni–Ge alloy. The Ge–Ge pair correlation for this intermediate short range order could well be reproduced by the modified Ge II microcrystalline model.View full abstractDownload PDF (988K) -
Yoshiyuki Kai1980 Volume 48 Issue 3 Pages 930-938
Published: March 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe binding of NAD, NADH and ADPR to LADH was accompanied by different temperature dependence of the phosphorescence decay rate of the tryptophan residue buried within the protein over the temperature range 0 to 30°C in aqueous solution. As a result of thermally induced transition with a hysteresis cycle in the response to temperature, the Arrhenius curves of the phosphorescence decay rate for NAD– and ADPR–EtOH–LADH complexes were overlapped with those for NADH– and ADPR–LADH complexes, respectively. The typical value of the decay rate at 0°C for the samples distributed at intervals over the range 20–1.5 sec−1 suggesting that the degree of stability of LADH dimer decreased in the order NADH–>NAD–>EtOH–>ADPR–LADH. In order to explain those results by thermal fluctuation process, a model for the conformation changes of the micro-environment around the residue is presented.View full abstractDownload PDF (1148K) -
Katsuyuki Nakano, Tohru Sugimoto, Hideo Suzuki1980 Volume 48 Issue 3 Pages 939-942
Published: March 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe absorption spectrum of 3-methyl lumiflavin in solution is reexamined by our previous formulation for π-electron systems, improving the previous estimation of the ratio of oscillator strength of the second to the first absorption band. It is found that the following two screenings are necessary to reproduce the absorption spectrum in benzene: (1) the screening of two-center Coulomb repulsion integrals for all the pairs of atoms except bonded ones; (2) that of the effective nuclear charges Z′ determined by Julg’s method for Slater-type 2pz-orbitals. It is also found that the absorption spectrum in ethanol or water can be explained by the model of 3-methyl lumiflavin interacting with two point-dipoles. The angle between the transition moments of the first and second bands is found to be at most 44.4° in benzene, 44.3° in ethanol and 45.8° in water.View full abstractDownload PDF (532K) -
Akio Itoh, Masatoshi Asari, Fumio Fukuzawa1980 Volume 48 Issue 3 Pages 943-950
Published: March 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe single and double electron capture cross sections σ10, σ21 and σ20 of heliumions have been measured in target gases of H2, He, N2, O2, CO2, CH4, C2H6 and C3H8 in the energy range from 0.7 to 2.0 MeV. The measured cross sections are compared with other experimental and theoretical values for the target gases of H2, He, N2 and O2. The additive rule for the charge-changing process of helium ions has been verified by using the cross sections for the carbon-containing molecules. Capture cross sections of helium ions in the collisions with carbon atoms have been estimated.View full abstractDownload PDF (864K) -
Keiichi Tanaka, Setsuo Akiyama, Taso Ikeura, Eizi Hirota1980 Volume 48 Issue 3 Pages 951-957
Published: March 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe transverse relaxation time T2 was measured for inversion doublets of the NH3 molecule from free induction decay signals. The results on the five J=K levels and the nine J=K+1 levels agreed satisfactorily with the values from linewidth experiments. The observed free induction decay signals were also analyzed by a Fourier transformation.View full abstractDownload PDF (668K) -
Kenji Ebihara1980 Volume 48 Issue 3 Pages 958-964
Published: March 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSIn order to estimate radial electromagnetic energy flow directed toward a tube axis and plasma heating power for theta pinch discharges, experimental measurements with probes were performed. Time development for the spatial distributions of the electromagnetic energy flow and the plasma heating power density was obtained, so that some interesting phenomena of the theta pinch plasmas were revealed; that is, at the compression phase, the radial distribution of the Poynting vector has a hump under special discharge conditions and total plasma heating power shows a maximum at earlier time than the total electromagnetic input power does.View full abstractDownload PDF (788K) -
Takashi Maekawa, Yasushi Terumichi, Shigetoshi Tanaka1980 Volume 48 Issue 3 Pages 965-972
Published: March 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIncident lower hybrid waves propagate toward the center of the plasma in a spiral form in the poloidal and the toroidal sections and finally are absorbed by the ion and/or the electron Landau damping within the limited spatial region in accordance with the refractive index parallel to the magnetic field, N⁄⁄, which is varied considerably along the trajectory, because of the toroidicity and the rotational transform. We propose the scaling law of the wave trajectories on plasma parameters, which shows that the control of N⁄⁄ or the applied frequency is necessary during the lower hybrid heating. These wave trajectories and damping based on the unmagnetized ion model are compared with those based on the magnetized ion model.View full abstractDownload PDF (1056K) -
Sanae Inoue, Kimitaka Itoh, Shoichi Yoshikawa1980 Volume 48 Issue 3 Pages 973-982
Published: March 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSKinetic theory of low frequency instabilities of a current-carrying finite-β plasma in a sheared magnetic field is investigated. Drift mode, drift-Alfvén mode and drift-tearing mode are identified both in collisionless and collisional regimes and each critical stability condition is obtained, We find a new electromagnetic localized mode driven by the plasma current in a finite-β plasma. Both the current and finite-β effects are required to excite this mode. It is also shown that, in the absence of the plasma current, any electromagnetic localized mode which is propagating in the direction of the electron diamagnetic drift is stable in the collisionless limit of a finite ion temperature plasma. For the collisional mode, stability holds if ω>ω* (electron diamagnetic frequency) or ω<0.View full abstractDownload PDF (1108K) -
Masao Sugawa, Reiji Sugaya, Hisayuki Nomoto1980 Volume 48 Issue 3 Pages 983-992
Published: March 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSTwo modes of electrostatic ion cyclotron waves excited in an ion beam plasma system are observed. One of these modes has a sharp and strong spectrum and its dispersion characteristics coincides with one of the backward electrostatic ion cyclotron wave with respect to the propagating component parallel to the magnetic field, the other has a broad spectrum and its dispersion characteristics coincides with one of the forward electrostatic ion cyclotron wave. These excited backward and forward waves occur due to the absolute and convective instabilities. And the transition between two instabilities is observed depending on system parameters. Also, the experimentally obtained temporal and spatial growth of these instabilities are compared with the theory of the weak beam approximation.View full abstractDownload PDF (1184K) -
Kazuhiro Nozaki, Katsunobu Nishihara1980 Volume 48 Issue 3 Pages 993-997
Published: March 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIt is shown that deflagration waves supported by thermal radiation are classified into two types, a supercritical and a subcritical deflagration. Their characteristics and structures are investigated in the framework of the diffusion approximation for radiation flux. The subcritical deflagration is found to be easily obtained and to lead to larger compression than the supercritical. The efficiency of compression driven by the deflagration waves is estimated to be 0.1∼0.3.View full abstractDownload PDF (632K) -
Shinichiro Yanase1980 Volume 48 Issue 3 Pages 998-1008
Published: March 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe stability of natural convection in a fluid layer between co-axial cylinders is investigated theoretically. Temperatures of the two cylinders are different by 2T0 and a uniform temperature gradient β(<0) is present in the vertical direction, and the ratio of the radii of the outer and inner cylinders is changed from 0 to 1. It is found that there exist three distinguishable instability modes and according to the values of T0, β and the ratio of the radii, one of the three modes becomes unstable.View full abstractDownload PDF (1164K) -
Shigeki Morioka1980 Volume 48 Issue 3 Pages 1009-1017
Published: March 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA steady, two-dimensional jet-flow of a dispersive compressible fluid issuing a medium at rest is considered on the basis of the linearized theory. The explicit solution is presented by using the Fourier transform technique and by solving the associated dual integral equations. The supersonic jet-flow shows almost periodic oscillation and exponential damping, while the regular subsonic jet-flow is permitted only for uniform stream with constant cross-section. Both solutions are reasonably connected at the critical upstream condition and they are also reduced to the solutions in ordinary gasdynamics as the dispersion vanishes.View full abstractDownload PDF (872K) -
Hirohumi Tougou1980 Volume 48 Issue 3 Pages 1018-1023
Published: March 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThis paper considers the roll-wave phenomenon out shallow turbulent flow down an inclined open channel. On the assumptions of long wave lengths and the Chézy formula for bottom resistance, Dressler has obtained periodic permanent roll-wave solutions with discontinuous water jumps. There exists a one-parameter family of possible wave trains for prescribed average discharge rate. However, if unstable wave trains are contained, they will not be realized. The linear stability of the permanent roll-wave train is then investigated to examine what wave trains are unstable in the family. They are shown to be unstable if their wave lengths are shorter than a certain critical value.View full abstractDownload PDF (728K) -
Yoshimasa Matsuno1980 Volume 48 Issue 3 Pages 1024-1028
Published: March 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSExact N-soliton and N-periodic wave solutions of the higher order Benjamin-Ono (B–O) equation ut=−(∂⁄∂x)(δIn⁄δu) are presented for n=5 by using bilinear transformation method, where In is the n-th conserved quantity of the B–O equation and δ⁄δu denotes the functional derivative. For n≥6, a method for transforming the higher order equations into the bilinear forms is proposed and explicit N-soliton solutions are speculated.View full abstractDownload PDF (368K) -
Kazuhiro Fukushima, Miki Wadati, Takeyasu Kotera, Katsuro Sawada, Yosh ...1980 Volume 48 Issue 3 Pages 1029-1035
Published: March 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe recurrence phenomena in nonlinear transmission line are studied quantitatively. For various frequencies and amplitudes of the input sinusoidal wave, the recurrence length is measured. The experimental results are explained by a simple theory which assumes the velocity differences of solitons cause the recurrence phenomena.View full abstractDownload PDF (884K) -
Takashi Sakuma, Sadao Hoshino1980 Volume 48 Issue 3 Pages 1036
Published: March 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (132K) -
Hajime Takayama1980 Volume 48 Issue 3 Pages 1037-1038
Published: March 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe commensurate(C)-incommensurate(IC) transition in a 2D classical sine-Gordon (SG) system is examined by analyzing the soliton creation energy ES of the 1D quantum SG system which is derived from the original 2D problem. The C–IC transition point, specified by the condition ES=0, depends explicitly on the cutoff parameter appearing in the 1D quantum problem.View full abstractDownload PDF (204K) -
Kazuyuki Itoh, Teruto Kataoka, Hironori Matsunaga, Eiji Nakamura1980 Volume 48 Issue 3 Pages 1039-1040
Published: March 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDistribution of the X-ray Bragg reflections in the reciprocal space was investigated for K2ZnCl4 at room temperature by means of the Weissenberg method. The structure in the ferroelectric phase is interpreted as a modulated structure, with a tripled c-axis of the unmodulated high-temperature structure, induced predominantly by a transverse phase modulation polarized along the ferroelectric a-axis. The atomic displacements due to the modulated waves are estimated from the crystal structure determined by Mikhail and Peters.View full abstractDownload PDF (240K) -
Hikaru Terauchi, Taiji Kohigashi, Takashi Ohga, Masaru Kawaminami, Tos ...1980 Volume 48 Issue 3 Pages 1041-1042
Published: March 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe X-ray scattering profiles from WO3 single crystal are carefully examined to investigate the acoustic instability near the monoclinic-orthorhombic phase transition temperature Tc=310°C. The spontaneous shear strain ezx is 0.016 at 25°C, decreases with increasing temperature and becomes zero at Tc. The temperature dependence of X-ray diffuse scattering intensity indicates that the elastic stiffness consant C55 becomes vanishingly small just above Tc.View full abstractDownload PDF (272K) -
H. W. Graben, Kai-Ning Chang1980 Volume 48 Issue 3 Pages 1043-1044
Published: March 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe Rayleigh-Ritz variational principle is used to formulate a rigorous bound on the threshold conditions under which three helium four atoms will form a bound state when their pair interaction is represented by the Lennard-Jones (n, 6) model and their nonadditive interaction is taken to be the Muto-Axilrod-Teller triple-dipole potential. The accepted parameter values of the model with n equal to 12 predict a bound-state trimer. The oversight, that of failing to use the (12, 6) parameter values of Kihara, Midzuno and Shizume in the extensive work on liquid helium, is pointed out.View full abstractDownload PDF (248K)