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- Proceedings of the Physico-Mathematical Society of Japan. 3rd Series
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- Tokyo Sugaku-Butsurigakukwai Kiji-Gaiyo
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Volume 53, Issue 1
Displaying 1-50 of 73 articles from this issue
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Masayoshi Tajiri1984 Volume 53 Issue 1 Pages 1-4
Published: January 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe two and three-dimensional nonlinear Klein-Gordon (and Higgs) equations are reduced to the one-dimensional nonlinear Schrödinger equation. N-soliton solutions of the two and three-dimensional nonlinear Klein-Gordon (and Higgs) equations are obtained by substituting N-soliton solutions of the one-dimensional nonlinear Schrödinger equation into the similarity transformations. It is also shown that the two and three-dimensional Higgs equations can be reduced to the second Painlevé equation.View full abstractDownload PDF (316K) -
Kazunori Aoki, Osamu Ikezawa, Keiichi Yamamoto1984 Volume 53 Issue 1 Pages 5-8
Published: January 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSChaotic behaviors of the current filaments in semiconductor have been investigated numerically, based on a model of firing wave instability. Phase portrait and surface of section of the chaotic motion reveal a basin of strange attractor which has the structure of a folded torus. The bifurcation of torus is discussed from the analysis of Fourier power spectra.View full abstractDownload PDF (504K) -
Hikaru Kawamura, Seiji Miyashita1984 Volume 53 Issue 1 Pages 9-12
Published: January 15, 1984
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSOrdering process of the antiferromagnetic Heisenberg model on the triangular lattice is studied. It is strongly suggested that there exists a phase transition both by a topological analysis of defects and by a Monte Carlo simulation. The phase transition is attributed to the pair dissociation of a kind of vortices which correspond to the topological point defect, Π1(SO(3))=Z2.View full abstractDownload PDF (500K) -
Tsutomu Kambe1984 Volume 53 Issue 1 Pages 13-15
Published: January 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSAn exact solution of a viscous incompressible flow is presented for a general initial condition. This flow represents an axisymmetric shear layer superimposed on an irrotational straining flow. The solution incorporates the three representative features of vortex motion: stretching, convection and viscous diffusion. In a particular case of constant straining, the flow approaches to a steady state in which the above three effects are in equilibrium. However if the initial state is composed of the same amount of opposite vorticities, the shear layer disappears exponentially in time. Spectral analysis of the solution shows the cascade of vorticity fluctuations to smaller scales.
The general solution includes the vortex solutions given by Oseen (1911) and by Burgers (1948), and partly overlaps the similarity solution found by Bellamy-Knights (1970).View full abstractDownload PDF (292K) -
Kiyomitsu Suzuki, Shigeo Hamada1984 Volume 53 Issue 1 Pages 16-19
Published: January 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe separatrix radius can be increased by application of external mirror field. This is concluded by a thought experiment and confirmed numerically. The radius depends not only on the average beta ratio ⟨β⟩ but also on configuration of the applied external field and the separatrix length. With restriction to a class of external field, an approximate formula giving the radius as a function of ⟨β⟩ and mirror ratio of the external field is proposed for configurations such that the separatrix ends are near the externally applied mirrors. Dependence of the radius on the separatrix length is also studied numerically. Its maximum value is explained with use of a thin plasma model.View full abstractDownload PDF (508K) -
J. W. Brill, Takashi Sambongi1984 Volume 53 Issue 1 Pages 20-23
Published: January 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe Young’s modulus of the linear chain compound ZrTe5 was measured by a vibrating reed technique. Near 140 K no anomaly was observed which would correspond to charge or spin density wave formation. A sharp decrease in modulus was observed at 84 K, suggesting the presence of a new structural phase transition.View full abstractDownload PDF (400K) -
Junzo Tanaka, Takefumi Mitsuhashi1984 Volume 53 Issue 1 Pages 24-25
Published: January 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSHeat capacity of (La0.8Ca0.2)MnO3 was measured by a laser-flash method. An anomaly of the heat capacity with the entropy change of ΔS=0.54 cal/mol·K was observed near magnetic transition temperature Tc. By assuming a simple Heisenberg model, an exchange interaction constant was determined to be J=8.0 cal/mol. The value of the magnetic heat capacity at Tc was ΔC=4.2R, which is nearly equal to the value calculated from a double exchange model. The analysis of the heat capacity near Tc showed clearly that the transition is of second order and induced only by the change of electronic state.View full abstractDownload PDF (280K) -
Seiji Yumoto, Moriji Mizoguchi, Shuichi Iida1984 Volume 53 Issue 1 Pages 26-29
Published: January 15, 1984
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDifferential thermal analysis was applied to an Fe3O4 single crystal with and without magnetic field in order to detect the heat capacity anomaly at about 10 K. However, in this temperature range, we could not detect an apparent heat capacity anomaly. In comparison with the heat capacity measurement of ErCrO3 at about 10 K, we have concluded that the energy change, if present, is less than 0.3 J for the formula unit.View full abstractDownload PDF (332K) -
Akio Furukawa, Yasukage Oda, Hiroshi Nagano, Yoshichika \={O}nuki1984 Volume 53 Issue 1 Pages 30-33
Published: January 15, 1984
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSMagnetization of 1T-TaS2 single crystal in the Anderson localized state has been measured at low temperatures. The magnetic susceptibility of 1T-TaS2 follows the Curie-Weiss law with the paramagnetic Curie point of 1.5 K in the measured temperature range of 10 K to 40 K. Forromagnetic order was found at ca. 0.9 K.View full abstractDownload PDF (384K) -
Hiromichi Ebisawa, Hidetoshi Fukuyama1984 Volume 53 Issue 1 Pages 34-36
Published: January 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSTheories on the field dependence of the anomalous magnetoresistance are refined to be applicable even in the relatively pure case (i.e. in the relatively high field case) in the two-dimensional weakly localized regime.View full abstractDownload PDF (220K) -
Yoshimasa Isawa1984 Volume 53 Issue 1 Pages 37-39
Published: January 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe results of numerical calculation for magnetoconductivity due to localization in 3-dimensional systems in weakly localized regime are given by taking into account the finiteness of cut-off parameters; z-component of momentum and the quantum number for orbital splitting.
We find that the finiteness of cut-off parameters makes decrease the magnetoconductivity compared to Kawabata’s results which are obtained on the assumption of cut-off parameters being infinite. The amount of decrease in magnetoconductivity increases as the magnetic field is increased. A saturation of magnetoconductivity due to localization will be observed as a function of field.View full abstractDownload PDF (276K) -
Seizo Morita, Nobuo Mikoshiba, Yoji Koike, Tetsuo Fukase, Michiharu Ki ...1984 Volume 53 Issue 1 Pages 40-43
Published: January 15, 1984
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSExperimental results of magnetoconductivity in metallic n-GaAs with carrier concentration n=ND−NA=8.74×1016 cm−3 have been analyzed with the theory of the Anderson localization. It was found that the coefficient of H1⁄2 due to the localization agrees quantitatively with the theoretical prediction by Kawabata. On the other hand, we found that the value of g3 due to the Coulomb interaction was nearly 8 times larger than the calculated value. These results obtained in n-GaAs are markedly different from previous results obtained in n-InSb.View full abstractDownload PDF (404K) -
Seiji Miyashita1984 Volume 53 Issue 1 Pages 44-47
Published: January 15, 1984
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSA variational study of the ground state of the antiferromagnetic spin 1/2 XY and Heisenberg models is presented. The present approach to the quantum spin system is complementary to what has done by Anderson and Fazekas. In the present approach the obtained ground state wave functions show a kind of sublattice order. A consideration on properties of the true ground state of the Heisenberg system is also presented.View full abstractDownload PDF (512K) -
Masasi Inoue, Mitsuhiro Matsumoto, Hideoki Kadomatsu, Hiroshi Fujiwara1984 Volume 53 Issue 1 Pages 48-50
Published: January 15, 1984
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSLow field ac magnetic susceptibilities have been measured on both as-grown and Zn-annealed Sn1−xCrxTe (x=0.01) crystals over the temperature range 1.5–300 K. The as-grown crystal undergoes a paramagnetic-to-ferromagnetic transition at 125 K, whereas the annealed one is ferromagnetic below 300 K and changes further into a spin glass like state below 120 K, indicating the presence of some ferromagnetic clusters which couple antiferromagnetically with each other.View full abstractDownload PDF (320K) -
Norio Kawakami, Shinya Tokuono, Ayao Okiji1984 Volume 53 Issue 1 Pages 51-54
Published: January 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe equilibrium-thermodynamic equations are derived following the Bethe Ansatz treatment of the degenerate Anderson model (strong correlation limit) for rare-earth impurities. The T-linear specific heat is calculated and its ratio to the magnetic susceptibility is discussed.View full abstractDownload PDF (476K) -
Akira Shinogi, Keizo Endo1984 Volume 53 Issue 1 Pages 55-58
Published: January 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe hyperfine fields of Ti47,49, Al27 and Ga69,71 in ferromagnetic Heusler alloys Co2TiAl and Co2TiGa are measured, and the Knight shifts of Al27 and Ga69,71 are also measured in the paramagnetic state above the Curie temperature. The hyperfine fields of Ti47,49 are −24.1±0.4 kOe in Co2TiAl and −26.6±0.4 kOe in Co2TiGa. They contrast with the positive fields of Co59. The hyperfine field of Al27 in Co2TiAl is −1.78±0.2 kOe and that of Ga69,71 in Co2TiGa is +2.76±0.2 kOe. The Knight shifts at high temperature limit are +0.06% for Al27 and +0.16% for Ga69,71. These small fields and Knight shifts originate from the reduction of the density of s electrons at Fermi level as seen for Al in alloys with transition elements.View full abstractDownload PDF (488K) -
Kunihiko Morimoto, Kenji Shimomura1984 Volume 53 Issue 1 Pages 59-61
Published: January 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSProton spin-lattice relaxation times T1 and T1ρ in partially deuterated ammonium sulfate were measured between 357 K and 118 K. The minimum values of T1ρ (2∼4 sec) in the paraelectric phase were attributed to the random modulation of the dipolar interaction between the protons in NHD3+ and the natural abundance of the 17O (0.037%) in SO4−2. The activation energy Ea∼4.1 kcal/mol for the reorientation of SO4−2 was determined.View full abstractDownload PDF (352K) -
Kazuo Gesi1984 Volume 53 Issue 1 Pages 62-65
Published: January 15, 1984
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSEffect of hydrostatic pressure on the normal(I)-incommensurate(II)-ferroelectric(III) phase transitions in K2ZnCl4 was studied by differential thermal analysis and dielectric constant measurements. The I–II transition temperature (283°C at 0 GPa) increases with increasing pressure with a rate of 110 K GPa−1. The II–III transition temperature (the ferroelectric Curie temperature: 127°C at 0 GPa) decreases with an initial slope of −86.2 K GPa−1 as pressure increases. The results were compared with previously reported pressure effects of other K2SeO4-group ferroelectrics.View full abstractDownload PDF (592K) -
Yasunori Yanagisawa, Ryoitiro Huzimura1984 Volume 53 Issue 1 Pages 66-69
Published: January 15, 1984
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSPhosphorescence enhancement induced by hydrogen adsorption is observed on UV-excited MgO powders in vacuo. The main peak of the spectrum is at 3.2 eV with a sub peak at 2.3 eV. The enhancement depends on the gas pressure and sample temperatures and the phosphorescence is quenched by the light illumination at 2.5 eV after UV excitation. The role of surface centers in the luminescence is discussed.View full abstractDownload PDF (448K) -
Osamu Arimoto, Ken-ichi Kan’no, Kaizo Nakamura, Yoshio Nakai1984 Volume 53 Issue 1 Pages 70-73
Published: January 15, 1984
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSColor center formation has been investigated in KBr: I crystals at 10 K under one photon pulse excitation into the localized exciton band by using ArF-excimer laser light. F and H centers are produced and their absorption spectra agree with those of F and H centers in pure KBr colored with X-rays. From time dependent measurements, it is found that F and H centers are simultaneously created and part of them decay with time constants of ∼20 μs and ∼100 μs by the mutual recombination. The transient behavior of these centers is similar to that of F and H centers in pure KBr. It is concluded that F and H centers are created in pairs from I−-localized excitons and the H centers thus created are not associated with I− ions.View full abstractDownload PDF (476K) -
Toshihico Arimitsu, Masashi Ban1984 Volume 53 Issue 1 Pages 74-75
Published: January 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe solvable model of the microscopic phase modulation, which was proposed previously by the authors, is investigated by the two-pulse photon echo.View full abstractDownload PDF (188K) -
Toshihico Arimitsu, Masashi Ban1984 Volume 53 Issue 1 Pages 76-78
Published: January 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe second order optical process is investigated by a solvable model of microscopic phase modulation in which a intermediate state is affected by a boson system. In the weak coupling limit, the model reduces to the case of Gaussian Markovian stochastic modulation of the intermediate state. As the model is exactly solvable, the non-Markovian effect of the boson modulation system can be explicitly studied with the temperature dependence.View full abstractDownload PDF (276K) -
Toshiyuki Nishitani, Masayoshi Tajiri1984 Volume 53 Issue 1 Pages 79-84
Published: January 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSSimilarity solutions of the Kadomtsev-Petviashvili equation are studied by means of finite transformation. It is shown that the similarity reductions to the equation of fewer independent variables are special cases of finite invariant transformation. The resonant interactions of similar-type solitons moving in non-steady and non-uniform background are studied.View full abstractDownload PDF (536K) -
Takao Yoshinaga, Tsunehiko Kakutani1984 Volume 53 Issue 1 Pages 85-92
Published: January 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSBy using a nonlinear LC transmission line, an experimental study of the properties of solitons concerning their width and velocity has been made to examine the validity of the higher order Korteweg-de Vries (K-dV) theory which is considered up to the second order effects of nonlinearity and dispersion. The theoretical result well agrees with the experimental data for fairly large amplitude region and the range of validity of this theory, in particular, with respect to the width is found to be much enlarged compared with that of the lowest order K-dV theory.View full abstractDownload PDF (864K) -
Tetsuo Tominaga, Toshihico Arimitsu1984 Volume 53 Issue 1 Pages 93-100
Published: January 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSBased on the time-convolution-less formulation of the damping theory, time evolutions of the photon intensity and its fluctuation of a laser model with N identical two-level atom systems are investigated for various situations from a quantum-statistical mechanical point of view. The energy exchange effect between the photon field and atom systems on the time evolutions reveals to be well described by the formulation even the atom system is eliminated adiabatically.View full abstractDownload PDF (772K) -
Tomohisa Mikado, Takio Tomimasu, Tetsuo Yamazaki1984 Volume 53 Issue 1 Pages 101-107
Published: January 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSElectrons of 24.8-MeV energy were incident on thick layers of C, Al, Cu, and Pb. Energy spectra f(E, θ) of transmitted electrons were measured at angles θ of 0°, 5°, 15°, 30°, and 60°. The material thicknesses ranged from ∼1 to ∼3.6 g/cm2, or ∼10 to ∼30% of the continuous slowing-down approximation range of the incident electrons in each material. The total number of emerging electrons s(θ), defined as ∫f(E, θ)dE, was evaluated for each material. The angular dependence of s(θ)⁄s(0°) is compared with the Moli\={e}re theory of electron multiple scattering including an energy-loss correction, a large-angle correction, and a modification of screening angle. The experimentally obtained s(θ)⁄s(0°) relative to the calculated one increases as θ increases, and this is more remarkable for materials of low Z than in the case of high-Z materials.View full abstractDownload PDF (752K) -
Yosuke Kayanuma1984 Volume 53 Issue 1 Pages 108-117
Published: January 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA simple stochastic model is proposed describing the nonadiabatic transitions in level crossing with energy fluctuation. The model is an extension of Zener’s model having a diagonal energy term fluctuating as a Markoffian Gaussian process. The transition rate P∞ defined in terms of the diabatic basis is calculated exactly by the formal perturbation expansion with respect to the off-diagonal coupling in the two limiting cases: In the slow fluctuation limit, P∞ coincides with the Landau-Zener formula, P∞=PLZ≡1−exp (−2πJ2⁄h|v|), where J is the off-diagonal coupling constant and v is the velocity of the change of the mean energy difference. In the strong damping limit, which is a limiting case of large fluctuation amplitude in the rapid fluctuation limit, P∞ is given by the formula, P∞=PSD≡{1−exp (−4πJ2⁄h|v|)}⁄2.View full abstractDownload PDF (1568K) -
Yosuke Kayanuma1984 Volume 53 Issue 1 Pages 118-122
Published: January 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe transition rate P∞ in the level crossing with energy fluctuation is investigated numerically by the Wiener-Hermite expansion technique for the stochastic variable. It is shown that the fluctuation tends to modify the transition rate as if the nonadiabaticity is effectively increased and that the values of the Landau-Zener formula PLZ≡1−exp (−2πJ2⁄h|v|) and the strong damping formula PSD≡{1−exp (−4πJ2⁄h|v|)}⁄2 give the upper and the lower bounds of P∞, respectively, for given values of J2⁄|v|, where J is the off-diagonal coupling constant and v is the velocity of the change of the mean energy difference.View full abstractDownload PDF (424K) -
Heiichi Takigami, Ziro Hasimoto1984 Volume 53 Issue 1 Pages 123-133
Published: January 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe behaviour of the characteristic solution in the neighbourhood of the first frozen Mach line is investigated for the two-dimensional steady supersonic flow of a non-equilibrium gas along a curved wall. We assume that the gas is in non-equilibrium with a finite reaction rate and various transport effects are negligible. It is found that when the wall is a continuous curved bend, the first spatial derivatives of gas properties at the first frozen Mach line depend on the relaxation length and the curvature of the wall shape at the beginning of the bend. The position of breakdown of the solution and the conditions necessary for no shock to form on the first frozen Mach line are obtained. For a concave wall with a sharp corner, a frozen shock wave emanating from the corner is formed. The shape of this frozen shock wave is also obtained. Further, the solution in the linearized case is obtained.View full abstractDownload PDF (1292K) -
Noriyoshi D\={o}hara1984 Volume 53 Issue 1 Pages 134-138
Published: January 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe two-dimensional flow between oscillating circular cylinders is theoretically analyzed. The outer cylinder performs rotatory oscillations and the inner cylinder performs translational oscillations with small amplitude. Particular attention is focused upon a steady secondary streaming owing to the nonlinear hydrodynamic effect. The analytical expression for the secondary streaming is obtained. Streamlines of the secondary streaming are shown for a couple of values of radii of two oscillating circular cylinders. The behavior of the steady secondary streaming induced between two cylinders is clarified.View full abstractDownload PDF (464K) -
Moon-Uhn Kim1984 Volume 53 Issue 1 Pages 139-147
Published: January 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSTwo-dimensional slow viscous flow due to the broadside translation of a flat plate along the center-line between two parallel walls is investigated on the basis of the Stokes approximation. An iterative solution is obtained by reducing the problem to a Fredholm integral equation of the second kind. Series expressions in power of ratio of widths of plate to channel are obtained for the drag on the plate and additional pressure difference between the ends of the channel due to the presence of the plate. Limiting values of the drag and the additional pressure drop are estimated from the series expression, when the plate nearly blocks the channel.View full abstractDownload PDF (768K) -
Shunichi Wakitani1984 Volume 53 Issue 1 Pages 148-155
Published: January 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSConsideration is given to the stability characteristics of two-dimensional wall plumes arising from a line source of heat positioned at the edge of vertical or inclined surface. The disturbance equations are solved numerically on the basis of the linear stability theory for a Prandtl number of 0.7 (air). Two unstable modes exist but no loop appears in the neutral stability curve as a result of merging of their modes. The effect of varying the angle of the surface inclination from downward-facing to upward-facing is to increase instability of the flow. The balance relation of disturbance energy shows that buoyancy forces have destabilizing effects in both modes.View full abstractDownload PDF (792K) -
Moon-Uhn Kim, Myung Kyoon Chung1984 Volume 53 Issue 1 Pages 156-166
Published: January 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSSteady two-dimensional slow viscous flow past a finite plate midway between an infinite channel composed of two parallel planes is investigated. The plate is held parallel to plane walls and the fluid velocity is assumed to have a parabolic distribution at upstream infinity. The problem is reduced to a mixed boundary value problem and two methods of solution for large and small plates are presented. Local and total skin frictions exerted on the plate and the pressure distirbution on the channel wall are calculated.View full abstractDownload PDF (812K) -
Kyoji Yamamoto1984 Volume 53 Issue 1 Pages 167-177
Published: January 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThis paper deals with the flow of rarefied gas past a circular cylinder at low Mach numbers and the heat transfer from the cylinder on the basis of the B–G–K equation. The solution is obtained in the form: the Oseen-Stokes solutions preparing slips at the cylinder surface and the correction terms in the kinetic region. The simultaneous integral equations for the velocity, density and temperature are derived. Numerical calculations for the thermal field were carried out over a wide range of the Kundsen number covering the slip to the nearly-free molecular flow. The variation of the Nusselt number with the Knudsen number is obtained and is favorably compared with a previous formula valid for small Knudsen numbers.View full abstractDownload PDF (952K) -
Yoshimoto Onishi, Noriyosi D\={o}hara1984 Volume 53 Issue 1 Pages 178-186
Published: January 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe behavior of a vapor gas around its spherical droplet is studied on the basis of kinetic theory. The velocity, pressure, and temperature fields are obtained for the case in which the Knudsen number of the system is small but the Reynolds number of the flow is finite. The negative mass flow which was pointed out in two-surface problems but has been considered quite unlikely to occur in these cases is shown to take place for the present problem under easily attainable conditions.View full abstractDownload PDF (928K) -
Teruji Cho, Masahiko Nakamura, Shin Kubo, Teruo Saito, Yasushi Terumic ...1984 Volume 53 Issue 1 Pages 187-192
Published: January 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSInjecting a high power microwave into the WT-1 toroidal device, production mechanism of toroidal plasma at the electron cyclotron resonance (ECR) is studied experimentally. Such ECR-plasma is used as microwave preionization of tokamak discharge. It is shown that ECR-preionization is useful for the reduction of loop voltage in the early stage, and the suppression of production of runaway electrons and hard X-ray in the quasi-steady stage.View full abstractDownload PDF (1288K) -
Keiichi Takasugi, Hidenori Akiyama, Mutsuo Takai, Susumu Takeda1984 Volume 53 Issue 1 Pages 193-200
Published: January 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe mechanism of plasma confinement by a surface magnetic field configuration (surmac) is studied in a linear device. The end losses are reduced by bending the surmac coil so as to have a small aperture at the both ends. The penetrating length of a plasma into the magnetic wall is much shorter than the local ion gyroradius. A sharp potential dip was observed at the position of the density drop, and it is confirmed that the formation of the dip is essential for the plasma confinement. The particle loss across the magnetic wall is due to classical ambipolar diffusion, and the saturation at high magnetic field operation is explained by the end loss.View full abstractDownload PDF (948K) -
Shobu Kaneko, Akio Takimoto, Masayoshi Taguchi, Takeshi Miyazaki1984 Volume 53 Issue 1 Pages 201-209
Published: January 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe Green-function method is applied to the Grad-Shafranov equation for the plasma in a flux conserver with a rectangular cross section. The linear and the nonlinear MHD equilibrium configurations for various strengths of the toroidal magnetic field B\varphi are determined by this method. The average beta value ⟨β⟩ and the safety factor are also evaluated. When B\varphi is increased from zero, ⟨β⟩ decreases and vanishes at a force-free configuration. The safety factor takes a maximum value on the magnetic axis. A sufficient condition for stability to axisymmetric perturbations is derived by use of Edenstrasser’s condition. This sufficient condition holds for the flux conserver of any shape. As an example, the region, in which this sufficient condition is fulfilled, is shown graphically for the flux conserver with rectangular cross section.View full abstractDownload PDF (944K) -
Tatsuro Miyasato, Masao Tokumura1984 Volume 53 Issue 1 Pages 210-218
Published: January 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe magnetic field and the heater temperature dependence of the attenuation of ballistic heat-pulse with transverse polarization propagating along the [100] axis were measured in Sb (0.38 or 2.1×1015/cm3) doped Ge at liquid He temperatures under the magnetic field up to 60 kG in the [100] direction. The experimental results show opposite trend to theoretical calculation of the phonon scattering based on the shrinkage effect of the donor wave function. On the other hand, a theoretical prediction which takes account of the scattering of the heat-pulse phonons by either polar or homo-polar pairs under the magnetic field in the [100] direction shows qualitative agreement with the experimental results.View full abstractDownload PDF (1096K) -
Haruyasu Yamashita, Itaru Tatsuzaki1984 Volume 53 Issue 1 Pages 219-225
Published: January 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSSound velocities along several directions in ammonium chloride crystals have been measured under hydrostatic and uniaxial pressures by means of an ultrasonic method. Second order elastic constants and their pressure derivatives were evaluated in the vicinity of the phase transition point in disordered phase, and third order elastic constants were calculated from the data. It was found that the absolute values of the third order elastic constants C111, C112 and C123 considerably increased with decreasing temperature near the phase transition point.View full abstractDownload PDF (784K) -
Hideshi Fujishita, Sadao Hoshino1984 Volume 53 Issue 1 Pages 226-234
Published: January 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSTemperature dependence of neutron diffraction intensities of PbZrO3 was measured in the room-temperature antiferroelectric phase. Intensities of strong superlattice reflections with wave vectors qΣ≡(1⁄4 1⁄4 0) and qR≡(1⁄2 1⁄2 1⁄2) show different temperature dependence each other. Intensities of weak superlattice reflections with qP≡(1⁄4 1⁄4 1⁄2)=qΣ+qR and products of intensities of reflections with qΣ and qR show the same temperature dependence. The crystal structure previously determined by Fujishita et al. [ref. 4] was reexamined; the structure was found to be described by a sum of modulations associated with lattice vibrational modes Σ3, R25x and R25y.
Successive phase transitions concerning these modulations were observed at 233°C and at around 235°C on heating, and at around 235°C and at 228°C on cooling. Because the modulation with qR is associated with mode R25, another antiferroelectric structural modulation which exists only in the intermediate antiferroelectric phase is required. In fact, an appearance of superlattice reflections with qM≡(1⁄2 1⁄2 0) was observed only in the intermediate phase.View full abstractDownload PDF (1212K) -
Kenichi Yamamoto, Minoru Fukui, Ryuji Abe, Akira Sakai, Toshirou Yagi1984 Volume 53 Issue 1 Pages 235-243
Published: January 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSESR spectra and dielectric constant of γ-irradiated RbH3(SeO3)2 and RbD3(SeO3)2 were measured simultaneously around the phase transition temperature (TC). It has been confirmed that in these substances with the doze of about 5 Mard, an incommensurate phase appears in the temperature range of about 4∼6 K above TC and the range broadens slightly with the increase of doze. From the analysis of temperature dependence of A tensor for SeO2− radical, it is clarified that SeO3(II) in RbD3(SeO3)2 rotates in a quite similar way with that in RbH3(SeO3)2 below TC. It was found for the first time that in RbD3(SeO3)2 the dielectric constant peak along the a-axis at TC is much larger than that along the b-axis. On these results some discussion is presented.View full abstractDownload PDF (1288K) -
Yoshihiro Ishibashi, Ikuo Suzuki1984 Volume 53 Issue 1 Pages 244-249
Published: January 15, 1984
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSAfter detailed analyses of the Slater theory of the ferroelectric phase transition in KH2PO4, an extension of it has been tried by introducing into it the terms of the second and the fourth orders in an order parameter, i.e., the polarization, each representing the dipole interaction and the electrostriction. By constructing phase diagrams in the space of temperature and newly introduced parameters, the nature of the transition point derived from the Slater theory become more clearly understood, i.e., it is a triple point and at the same time can be regarded as an end point of the tricritical line.View full abstractDownload PDF (648K) -
Junjiro Kanamori1984 Volume 53 Issue 1 Pages 250-260
Published: January 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIt is shown that the lattice gas version of the Ising model on the honeycomb lattice has infinite series of the regularly ordered ground states in the concentration range around the density x=1⁄2 when pairwise interactions satisfy the conditions given by V1>4V2−2V3 and V2>V3≥0 or those by V1>4V2−3V3, 2V2>V3, and V3≤0 with V1, V2 and V3 denoting the interaction constants of the first, second and third neighboring pairs, respectively; a positive interaction constant corresponds to a repulsive interaction. The equivalent Ising spin system has an infinite number of steps in the magnetization vs. field relation. Three kinds of infinite series of the ground states are found when the interaction constants are varied within the abovementioned conditions.View full abstractDownload PDF (1436K) -
Masahito Yoshizawa, Takashi Suzuki, Terutaka Goto, Tsutomu Yamakami, T ...1984 Volume 53 Issue 1 Pages 261-269
Published: January 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSHeat capacity of (CH3NH3)2FeCl4 (MAFeC) and (C2H5NH3)2FeCl4 (EAFeC) at constant pressure have been measured by an AC calorimetry. Three phase transitions were detected on MAFeC and four phase transitions on EAFeC. The structural phase transitions of both compounds at highest temperature region are described by the renormalization group method for 3-d XY model (d=3, n=2). In the II–III phase transition of EAFeC, the logarithmic divergence due to the dipole-dipole interaction is found. The crossover scheme of the 2-d system from XY to Ising was proposed for the magnetic phase transitions of both compounds at the lowest temperature region.View full abstractDownload PDF (884K) -
Yutaka Nishio, Norio Kobayashi, Yoshio Muto1984 Volume 53 Issue 1 Pages 270-278
Published: January 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe specific heat of 1T-Ta1−xTixS2 in the concentration range of 0≤x≤0.144 was measured from 1.5 to 5 K. The specific heat in magnetic field up to 60 kOe was also measured for two samples with x=0.04 and 0.07. Excess specific heat was observed at low temperatures for all the samples studied. It was also found that the excess specific heat depends on the magnetic field for the metallic (x=0.04) samples as well as for the nonmetallic (x=0.07) one. Excess specific heat analyzed as a Schottky type one is confirmed to be related to the Anderson localized states. The results are discussed by considering not only the intrastate electron correlation but also the interstate one between Anderson localized states.View full abstractDownload PDF (1348K) -
Hidenao Sugawara, Kenzo Naito, Tatsuya Miya, Akito Kakizaki, Ichiro Na ...1984 Volume 53 Issue 1 Pages 279-283
Published: January 15, 1984
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSPhotoelectron spectra of chromium metal have been measured in the excitation energy range from 30 to 80 eV at room temperature. Valence band spectra measured at low excitation energies are consistent with that of the calculated density-of-states curve in an overall feature, but not in a detailed feature. Resonant photoemission occurs in the valence band region on excitation above the 3p threshold. The general features of the intensity variations of valence band structures with excitation energy are consistent with the recent model calculation.View full abstractDownload PDF (612K) -
Mitsuru Matsuura1984 Volume 53 Issue 1 Pages 284-288
Published: January 15, 1984
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe second order energy shifts of 1s, 2s and 2p states of the polaron bound in the Coulomb potential are evaluated by various approximate and “exact” numerical methods, proposed by many authors. The comparison of these results makes clear the validity of the approximate methods. For the 1s-2p transition energy in silver halides, there are large discrepancies between the “exact” numerical results and the approximate results of Bajaj and Clark; the second order perturbation theory does not yield so good agreement with the experiment as previously inferred from an approximate evaluation.View full abstractDownload PDF (676K) -
Takeo Matsubara, Yoshikazu Sakakura1984 Volume 53 Issue 1 Pages 289-295
Published: January 15, 1984
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSOn the basis of Weaire-Thorpe model, a rigorous argument is given on the energy bounds for the electronic states of dangling bonds in amorphous silicon. Starting with the equation of motion for the amplitude of LCAO wave function derived from the Weaire-Thorpe Hamiltonian, several inequalities holding among the amplitude and model parameters are derived. Based on these inequalities, the energy bounds for the valence band, conduction band and mid gap energy band are determined. An estimate of the gap as function of dangling bond concentration is given.View full abstractDownload PDF (712K) -
Takeo Matsubara, Yoshikazu Sakakura1984 Volume 53 Issue 1 Pages 296-301
Published: January 15, 1984
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe projection operator method developed in I to discuss the dangling bond states is used to give a rigorous argument on the energy bounds for the electronic states of hydrogenated bonds in amorphous silicon. Two types of model for a-Si: H are considered: In the first model, each dangling bond is terminated by connecting single hydrogen atom (SiH model), and in the second model a broken bond at random is filled by two hydrogen atoms (SiHHSi model). For both models, it is concluded from analysis of energy bounds that the energy gap is always increased due to the passivation of dangling bond by hydrogenation.View full abstractDownload PDF (540K)