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- 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
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Volume 49, Issue 1
Displaying 51-71 of 71 articles from this issue
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Tatsuo Shoji1980 Volume 49 Issue 1 Pages 327-333
Published: July 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMechanism of radio-frequency plugging and heating are described in terms of the plasma impedance. It is shown theoretically that the rf plugging effect appears in the frequency region, where the capacitance of rf electrodes decreases when the plasma is filled between them. The heating occurs inversely proportional to the resistance of the electrodes. These theoretical predictions are compared with the experimental observations, demonstrating a satisfactory agreement.View full abstractDownload PDF (820K) -
Kouzi Matsunaga1980 Volume 49 Issue 1 Pages 334-342
Published: July 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSBasic experiments of turbulent heating are carried out on a non-isothermal, inhomogeneous and collisionless plasma in a uniform magnetic field. A high frequency drift wave (HFDW) with k⁄⁄\simeqk⊥≠0 and ωpi>ω>>Ωi is excited by the parallel electron current to the direction of the magnetic field. From detailed measurements of the ion energy distribution, it is found that ions are heated isotropically and nonlocally. The ion heating is always accompanied with the large amplitude HFDW turbulence. The ion heating rate can be well explained by the semi-phenomenological quasi-linear stochastic heating theory.View full abstractDownload PDF (1332K) -
Yukiharu Ohsawa, Tetsuo Kamimura1980 Volume 49 Issue 1 Pages 343-349
Published: July 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSPlasma Confinement times for mirror and cusp devices are investigated by using a newly developed Monte Carlo simulation model which can include the effects of binary collisions, arbitrary spatial change in the magnetic field, and external electric fields. For a mirror, the simulation results are in good agreement with theory. For a cusp (without an external electric field) the confinement time is found to be proportional to the plasma radius divided by the average velocity, which is approximately the same as the theoretical confinement time given by Kaye et al.View full abstractDownload PDF (812K) -
Kazuyuki Ohe, Koshin Asano, Susumu Takeda1980 Volume 49 Issue 1 Pages 350-355
Published: July 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe evolution of the wave packet of ionization wave excited by a small pulsed perturbation is investigated in the He positive column of glow discharge. The second differential coefficients of the wave number and the spatial growth rate are calculated from the observed space-time diagram of the wave packet. The ratio of the number of the temporal to spatial oscillations included in the half width of the packet coincides with the ratio of the group to phase velocities.
From a part of the recurrence observed in the continuously modulated wave, the recurrence length is calculated. It almost agrees with the theoretically predicted one.View full abstractDownload PDF (664K) -
Tsutomu Ikemura, Kunioki Mima1980 Volume 49 Issue 1 Pages 356-367
Published: July 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe conditions under which an incident, x-z polarized strong pump electromagnetic wave propagating in the z-direction is self-trapped as an equilibrium filament in an initially uniform plasma are found for a Gaussian pump profile as exp [−(x−xm)2⁄2dx2]. Coupled equations describing the parametric coupling of two electron Langmuir waves due to the spatially aperiodic inhomogeneity of the self-trapped pump filament amplitude are then derived. Moreover, an analysis of the eigenvalue problem arising from these equations demonstrates a possibility that decay Langmuir waves can be trapped as temporally growing waves in a density cavity created by the inhomogeneous pump when the pump amplitude exceeds the threshold rather less than that for the decay instability of Jackson-type.View full abstractDownload PDF (1200K) -
Sanae Inoue, Kimitaka Itoh, Shoichi Yoshikawa1980 Volume 49 Issue 1 Pages 367-375
Published: July 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWe present a comprehensive theory of the electrostatic drift instabilities of a collisionless plasma in a toroidal device. The effects of inhomogeneities (density, electron and ion temperature gradients), plasma current, radial electric field, magnetic shear and toroidal curvature drift are simultaneously examined; we derive the general but simple criteria for the drift stability. The instabilities are found to be excited owing to the plasma current, ion temperature gradient, curvature of ion cross-field flow and toroidal effects, although the magnetic shear has a prominent stabilizing power. Drift waves are expected to be almost always unstable in tokamak plasmas.View full abstractDownload PDF (1088K) -
Tsuguhiro Watanabe, Toshio Tange, Chikara Ueno, Haruyuki Irié, ...1980 Volume 49 Issue 1 Pages 376-384
Published: July 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA systematic iteration scheme is presented to numerically solve the eigenvalue problem described by a coupled set of second-order differential equations under the boundary conditions that the solution is localized near the origin. The method consists of the application of Newton’s iteration scheme to the shooting method. A useful analytical expression for the correction to the trial eigenvalue is obtained. Application is made for two examples, simple harmonic oscillator and electro-magnetic drift-wave in a finite-β plasma in a sheared magnetic field, to demonstrate a remarkable stability, efficiency and accuracy of the method. In the latter example, reduction of the CPU time by factor 20–30 is obtained as compared with the standard simplex method.View full abstractDownload PDF (820K) -
Toshiatsu Oda, Shin-ichi Kiriyama1980 Volume 49 Issue 1 Pages 385-390
Published: July 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSUsing a Z-pinch plasma as a source, Stark broadened profile of the He II 4686 A line has been measured and compared with Stark broadening theories. The electron density has been obtained from best fit profiles of the He I 3889 A line to the theory. The electron density range is 1.9–3.7×1017 cm−3. The electron temperature has been determined from the intensity ratio of the He II 4686 A and the He I 3889 A lines, yielding ∼5×104 K. The experimental profiles stand between the calculated profiles of Greene and of Kepple. The discrepancy between the experiments and the theories is briefly discussed in relation to the neglected effect of the ion motion in the calculation of the hydrogen and the hydrogenic ion line profiles.View full abstractDownload PDF (664K) -
Sunil Kumar Nag1980 Volume 49 Issue 1 Pages 391-395
Published: July 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe two-dimensional flow of a dusty fluid induced by sinusoidal wavy motion of an infinite wavy wall has been discussed. The basic equations have been solved by regular perturbation method at moderate amplitudes of the motion of the wall and for large wave-length. The velocity components of the fluid and the dust particles along the axial and the transverse directions consist of a mean steady flow and a periodic flow, except for the transverse component of the velocity of the fluid. It is found that the mean steady flow is proportional to 4π2a2⁄L2, where a and L are respectively the amplitude and the wavelength of the wavy wall. Graphs of the velocity components for various values of mass-concentration of the dust particles have been drawn. It is found that the velocity components of both fluid and dust particles are oscillatory and decrease rapidly along the transverse direction and that the amplitudes of oscillations of the fluid are greater than those of particles.View full abstractDownload PDF (416K) -
Mieko Arakawa1980 Volume 49 Issue 1 Pages 396-404
Published: July 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe mechanism of the genesis of the Korotkoff sounds is investigated by model experiment using latex tubes and a segment of isolated blood vessel of dogs. The tube compliance is much reduced when the transmural (internal minus external) pressure is very high or very low, and increases radically for intermediate states. It can be concluded that there are two different mechanisms by which the sounds are emitted. One is durable sounds caused by self-excited vibration in the process of collapse of the tube, and the other is impulsive sounds emitted transiently when the tube compliance is abruptly decreased. It is possible to explain qualitatively the change of sound phases over a wide range from systole to diastole as an appropriate mixture of durable and impulsive sounds.View full abstractDownload PDF (1708K) -
Md. Shamsul Alam, Katsuya Ishii, Hidenori Hasimoto1980 Volume 49 Issue 1 Pages 405-408
Published: July 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe slow motion of a small sphere in an incompressible viscous fluid outside of a circular cylinder is studied on the basis of Stokes equations of motion. The force on the sphere translating in any direction has been calculated upto the first order effect of the boundary. An interesting result is that the wall correction factor k satisfies the inequality kθ<kz<kr, where the suffices r, θ and z denote respectively the direction of motion in cylindrical coordinates with the central axis of the cylinder as the z axis. For large radial distances r0 from the axis, they are found to be proportional to 1⁄(r0 log r0).View full abstractDownload PDF (424K) -
Noriko Saitoh1980 Volume 49 Issue 1 Pages 409-416
Published: July 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA generalized equation is derived from the Toda lattice by a transformation of variables including a characteristic parameter h. The equation reduces to the original Toda lattice for the value h=1, while to the K-dV equation at the limiting value h=0. Soliton solutions of the equation are obtained by the inverse scattering method, reproducing the corresponding solution of the K-dV equation in every step of the calculation.View full abstractDownload PDF (540K) -
Ken Ito, Ikuo Ono1980 Volume 49 Issue 1 Pages 417-418
Published: July 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSA single-site effective medium theory is used to study temperature-dependent percolation. The special case discussed is the conductivity of a lattice gas with nearest-neighbor interactions. The assemblies of atoms are regarded as a square resistor network consisting of randomly distributed conductive bonds, which are assumed to correspond to pairing of atoms. The estimated values of critical percolation-concentration of atoms are proved to be in good agreement with Monte Carlo results.View full abstractDownload PDF (228K) -
Hironobu Fujii, Tetsuhiko Okamoto1980 Volume 49 Issue 1 Pages 419-420
Published: July 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe Curie temperatures of the system (Fe1−xNix)2P have been measured as a function of pressure up to 5 kbar. The pressure effect on the Curie temperature ∂Tc⁄∂p is −3.46×10−3 deg. bar−1 for Fe2P, and its value increases sharply with increasing x and becomes zero at about x=0.3. The pressure effect on the exchange interactions in Fe2P is discussed briefly according to the concentration dependence of ∂Tc⁄∂p in the system (Fe1−xNix)2P.View full abstractDownload PDF (276K) -
Takeo Fujiwara1980 Volume 49 Issue 1 Pages 421-422
Published: July 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSElectronic structure of amorphous metallic alloy Fe76P24 is calculated by using an atomic structural model and the atomic sphere approximation to the KKR method. Potential parameters are determined by superposing the charge density of neutral atoms. The strong hybridization with Fe–3d and P–3p band is observed and the electron energy stability is attributed to the charge transfer and the hybridization.View full abstractDownload PDF (260K) -
Akikatsu Sawada, Atsuo Hattori, Yoshihiro Ishibashi1980 Volume 49 Issue 1 Pages 423-424
Published: July 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe temperature dependence of the elastic constant c55 of C6H5NH3Br crystal has been studied by ultrasonic method. In the high temperature phase c55 is found to soften towards the ferroelastic Transition temperature Tc. The mechanism of ferroelastic transition is discussed phenomenologically.View full abstractDownload PDF (244K) -
Chiharu Takei, Yasuharu Makita1980 Volume 49 Issue 1 Pages 425-426
Published: July 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSUltrasonic velocities (vi) and absorption coefficients (αii) of longitudinal waves propagating along the a, b, and c axes in RbH3(SeO3)2 near the Curie temperature (Tc) were measured by pulse echo superposition technique. The crystal shows anomalies both in vi and αii (i=1, 2, 3) at Ti=(2.2°C+Tc), the upper phase transition temperature reported by Gladkii et al., besides their anomalies at Tc. The anomalous parts of vi and αii all show a tendency to diverge at Ti.View full abstractDownload PDF (224K) -
Makita Tsukui, Minoru Sumita, Yasuharu Makita1980 Volume 49 Issue 1 Pages 427-428
Published: July 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe complex dielectric constant of RbH3(SeO3)2 near the Curie temperature (Tc) was measured in a frequency range between 3 MHz and 1000 MHz. Dielectric relaxation with nearly monodispersive character was found in the vicinity of Tc and the relaxation time showed critical slowing down.View full abstractDownload PDF (308K) -
Masanori Cho, Toshirou Yagi1980 Volume 49 Issue 1 Pages 429-430
Published: July 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe temperature dependence of the Brillouin scattering spectra of K2SeO4 was observed near the hexagonal-orthorhombic phase transition point T1 (745.0 K). A softening of the longitudinal acoustic mode was found in the [100] direction of orthorhombic phase with increasing temperature toward T1. In the hexagonal phase, the frequency of the acoustic mode is nearly independent of temperature.View full abstractDownload PDF (280K) -
Kiyoshi Ueda, Kuniya Fukuda1980 Volume 49 Issue 1 Pages 431-432
Published: July 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSFor rubidium atom perturbed by xenon, absorption measurements have been made to observe collision-incuded dipole transitions 5s−ns (n=10 and 11), −nd (8≤n≤16) and −nq (7≤n≤15), where q stands for the manifold states of l≥3. The n-dependence of the measured effective oscillator strengths is reproduced well by the approximate calculation using a simple model based on the interaction of a Rydberg electron with a xenon atom, although the calculation gives larger values than the experiment by a factor of about 4.View full abstractDownload PDF (264K) -
Yoshiyuki Yamada, Yoneyoshi Kitagawa, Izumi Tsuda, Masahiro Yokoyama1980 Volume 49 Issue 1 Pages 433-434
Published: July 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe plasma boundary fluted due to the Rayleigh-Taylor instability was observed in the early stage of implosion phase of the focus plasma by using the shadow-graph technique. Only in the strong focus region, this instability disappeared at the end of implosion phase and the stable pinch column was formed over 20 ns.View full abstractDownload PDF (512K)