All issues
Volume 25 (1968)
- Issue 6 Pages 1525-
- Issue 5 Pages 1207-
- Issue 4 Pages 933-
- Issue 3 Pages 655-
- Issue 2 Pages 301-
- 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 25, Issue 4
Displaying 1-50 of 55 articles from this issue
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Akira Katase1968 Volume 25 Issue 4 Pages 933-945
Published: October 05, 1968
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSTrajectories of three point charges are computed two-dimensionally to analyze the experimental data of ternary fission. In the case of a fission accompanied by a long-range alpha particle (LRA fission), the final value of emission angle of the alpha particle is found to depend mainly on the values of the fragment mass ratio and the ratio x, where x=Da (distance between emission point and light fragment)/Df (distance of two fragments at scission). The final alpha particle energy EA is represented by the equation
(Remark: Graphics omitted.)
where Eα is an initial kinetic energy. The values of parameters a, b, c, d, e, f, g, h and x0 are determined for some values of the mass ratio and the total kinetic energy in LRA fission of 236U and 252Cf. The distributions of Eα, Df and the initial total kinetic energy of two fission fragments are obtained for LRA fission of 252Cf. Most of fragments are shown to have already about one-third of the final kinetic energy at scission.View full abstractDownload PDF (1692K) -
Sadayoshi Fukumoto, Takekiyo Matsuo, Hisashi Matsuda1968 Volume 25 Issue 4 Pages 946-950
Published: October 05, 1968
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe atomic mass difference of 40Ca and 40Ar atoms has been measured directly by the high resolution mass spectrometer of Osaka University operating at a resolving power of 700,000∼1,000,000. The result obtained is 208.2±0.5 μu and somewhat larger than the value based on the 1964 atomic mass table.View full abstractDownload PDF (448K) -
Hisashi Matsuda, Takekiyo Matsuo1968 Volume 25 Issue 4 Pages 950-952
Published: October 05, 1968
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe high resolution mass spectrometer at Osaka University has been used to measure the atomic masses of 1H, 16O and 32S. Mass differences of four doublets, C3H8–CS, C3H8–CO2, CO2–CS and C2H6S–C5H2, were measured by using peak-matching technique and mass values were calculated. The resulting mass values are 1H=1.007 824 99 ± 14, 16O=15.994 912 1 ± 12 and 32S=31.972 069 3 ± 10 u.View full abstractDownload PDF (344K) -
Haruko Ohmura, Toshiyuki Ishimatsu, Kohsuke Yagi, Hiroyasu Ejiri, Yuta ...1968 Volume 25 Issue 4 Pages 953-964
Published: October 05, 1968
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe level structure of 46Ti has been studied by means of the 45Sc(3He, d)46Ti reaction with 24.3 MeV 3He particles. Thirty-eight deuteron groups have been observed with a broad-range magnetic spectrograph up to an excitation of 8.5 MeV in 46Ti. Angular distributions were measured and compared with DW calculations to obtain values of the orbital angular momentum transfer and spectroscopic information. For most of the angular distributions there is considerable mixing from shells other than 1f7⁄2. Energies and spectroscopic factors of low-lying levels are compared with those calculated with the pure (1f7⁄2)6 configuration model. Comparison with 50Cr, a cross-conjugate nucleus of 46Ti, is also made.View full abstractDownload PDF (1204K) -
Kazuo Iwatani, Iwao Fujita, Masateru Sonoda, Akira Katase, Yoshihisa W ...1968 Volume 25 Issue 4 Pages 964-970
Published: October 05, 1968
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSEnergy spectra and angular distributions were measured for protons emitted from Zn64 and Zn66 bombarded with 14.1 MeV neutrons. Any of level density formulae fits equally well the energy spectrum for backward angles. The constant temperature formula gives 1.22±0.07 MeV and 1.35±0.05 MeV as the nuclear temperatures of Cu64 and Cu66 respectively. Using the Lang level density formula, the level density parameters for Cu64 and Cu66 are given as 8.26±0.78 MeV−1 and 5.39±0.56 MeV−1 respectively. The proton angular distributions are concave and symmetric around 90°. Anisotropy is greater for higher energy protons. The anisotropy of lower-energy protons emitted through the (n, p) reaction is found to be comparable to the anisotropy of those emitted through the (n, np) reaction. The cross sections for the (n, p) and (n, np) reactions for Zn64 through compound process are 127±9 mb and 169±26 mb and those for Zn66 30.0±1.1 mb and 40.5±8.3 mb respectively. The direct (n, p) reaction for Zn64 has a cross section of about 5 mb.View full abstractDownload PDF (728K) -
Isao Shimamura1968 Volume 25 Issue 4 Pages 971-986
Published: October 05, 1968
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA variational method is developed for the calculation of upper and lower bounds on the phase shifts for the scattering of a particle by a compound system. It is essentially the combination of a generalization of Kato’s method with a couple of variational principles, i.e. Kato-Temple’s and Kohn’s methods. First, the central field version of the theory is applied to the s-wave scattering of an electron by the static potential of a hydrogen atom. A trial function with 10 parameters gives the results accurate to about 10−7 radians at the incident energies lower than 0.5 atomic units. Then rigorous bounds on the phase shifts for the s-wave elastic scattering of an electron by a hydrogen atom are calculated with a 52-parameter-trial function. The lower bounds are fairly close to other reliable published data. On the other hand, the upper bounds are not very close to them, and the difference between the both bounds for the wave number k=0.4 a.u. is 0.029 radians for the singlet scattering, and 0.18 radians for the triplet scattering.View full abstractDownload PDF (1960K) -
Seizo Ueda1968 Volume 25 Issue 4 Pages 986-988
Published: October 05, 1968
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIt is shown that the formulas for the spin diffusion coefficient Ds of the weakly interacting system of He3 atoms in the regions of temperature much higher and much lower than the degenerate temperature of the system, which were given by Ebner and by Bardeen, Baym and Pines in the respective regions of temperature by solving the kinetic equation, can be derived from the expression for Ds which has been obtained by the author in the quantum statistical theory of spin echo.View full abstractDownload PDF (276K) -
Minoru Kikuchi1968 Volume 25 Issue 4 Pages 989-1000
Published: October 05, 1968
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe effects of strong electron correlations on impurity band conduction in semiconductors are investigated following Hubbard’s method. The random nature of the system is taken into account by adopting the level density spectrum calculated by Matsubara and Toyozawa for the case with no correlation. It is found that the impurity concentration dependence of the band gap caused by correlations has a remarkable similarity to the behaviour of the activation energy ε2 observed in the resistivity vs temperature curve at the intermediate concentration range. The dynamical damping effects due to the spacial and temporal density fluctuations of the correlating electrons are shown to be important for the band broadening in the higher concentration regions. The calculated results strongly suggest an important role of electron correlations in the mechanism which gives rise to the activation energy ε2.View full abstractDownload PDF (1680K) -
Hideji Yamada, Masao Shimizu1968 Volume 25 Issue 4 Pages 1001-1007
Published: October 05, 1968
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSInelastic scattering of neutrons by spin waves is investigated in ferromagnetic metals with multiple bands. Differential scattering cross sections due to various branches of spin waves are estimated. It is found that at 0°K the differential scattering cross section due to spin waves in an acoustical intra-band branch shows a maximum as a function of the momentum of spin waves, because of the existence of an acoustical inter-band branch. In the two band model, the dispersion relations of spin waves and the differential scattering cross sections are numerically calculated. A possibility of the observation of the neutron scatterings due to the acoustical inter-band branch is discussed.View full abstractDownload PDF (820K) -
Kazuo Miyatani, Shuichi Iida1968 Volume 25 Issue 4 Pages 1008-1016
Published: October 05, 1968
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMagnetic susceptibility and nuclear magnetic resonance of Al27 and Co59 were studied for Ni–Al, Co–Al, and Fe–Al intermetallic compounds with CsCl-type structure. Curie-Weiss type paramagnetism was observed for the Fe–Al and cobalt rich Co–Al compounds, and Pauli type paramagnetism was observed for the Al rich Co–Al and all Ni–Al compounds. A temperature independent negative Knight shift of Al27 was observed in the Fe–Al system. The line width increases in the Fe–Al and Co–Al compounds when Al content decreases and Curie-Weiss type paramagnetism appears. The line intensity shows a sharp maximum at the stoichiometric composition XAl, and decreases steeply to the both sides due to the effects of quadrupole interactions.
All the results have been discussed based on the band model. It is concluded that the excess Co and Fe atoms make small clusters to which the positive increase in the susceptibility and the line broadening are attributed, and that the vacancies at the Ni and Co sites in the Al-rich sides of the Ni–Al and Co–Al systems produce second-order quadrupole effects on the nearest neighbor aluminum.View full abstractDownload PDF (1268K) -
Makoto Okochi, Hiroshi Nosé1968 Volume 25 Issue 4 Pages 1017-1020
Published: October 05, 1968
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSExcitation of the uniform precession mode of the main peak in spin wave resonance is investigated for perpendicular and parallel cases. A relation between the resonance field for the main peak and the film thickness is examined by using the special films with a constant gradient in thickness. It is found that the resonance curves of these films are very broad and asymmetrical and are composed of the sharp ones of the divided parts having various resonance fields. Since the resonance field for the main peak depends on the film thickness, it is concluded that the uniform precession mode is not excited in thin metal films for both perpendicular and parallel cases.View full abstractDownload PDF (444K) -
Tatsuo Shimizu1968 Volume 25 Issue 4 Pages 1021-1024
Published: October 05, 1968
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSTwo problems are considered: The one is the calculation of the ESR spectrum due to a donor pair in the case of the exchange interaction J being comparable to the hyperfine constant A. The other is the calculation of the ESR spectrum due to three interacting donors. For a donor pair, the calculated spectrum is averaged over the random distribution of donors. In both cases it is shown that a broad background appears, which extends outside the two hyperfine lines situated at gμBH±A⁄2. For a donor pair, the background is asymmetric about the central line. For three interacting donors, the background is symmetric when all the exchange interactions among them are far larger than A, while a preliminary calculation indicates that the background becomes asymmetric when some of the exchange interactions are comparable to A. Such an asymmetric background as calculated in the present paper might be a partial origin of the observed one.View full abstractDownload PDF (456K) -
Akira Yanase, Tadao Kasuya1968 Volume 25 Issue 4 Pages 1025-1042
Published: October 05, 1968
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSVarious anomalous magneto-optic and magnetic properties of Eu1−x Gdx Se are explained on the magnetic exciton and the magnetic impurity state model. It is shown that the optically active magnetic exciton with the lowest energy is of the type of (5d–5d), that is, 5d character on the central Eu3+ and also 5d on the nearest neighbour Eu2+. The origin of the anomalous magneto optic properties is attributed to the d–f exchange interaction on the nearest neighbour Eu2+ ions.
While, for the magnetic impurity state, (6s–6s) type state has the lowest energy. At low temperature, a giant spin molecule (S=46) composed of the spin of an impurity electron and the 4f spin on the central Gd3+ ion and the n.n. Eu2+ ion is constructed through the s–f exchage interaction among them. However, this giant spin molecule disappears rather quickly as temperature increases exceeding J1⁄κ, where J1 is the s–f exchange constant at n.n. Eu2+ and is estimated as 25κ. The anomalous magnetic properties of the dilute alloy is deduced from this behavior of the magnetic impurity state.View full abstractDownload PDF (1952K) -
Yoshikazu Hayashi, Minoru Fukui1968 Volume 25 Issue 4 Pages 1043-1054
Published: October 05, 1968
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe relaxation mechanisms in multilevel spin system have been studied by detecting the ESR using optical Faraday rotation. Both allowed and forbidden transitions have been investigated. The steady state of the spin system is analyzed by rate equations and thermodynamical treatments. 4-spin cross relaxation processes are effective to the center line of the allowed transitions. One the other hand, the spin-lattice relaxation processes are dominant for the other lines. Saturation phenomena have been observed both for the allowed and forbidden transitions. The center line of the allowed transitions does not saturate over the microwave power range used in the experiments. The temperature and the magnetic field dependences of spin-lattice relaxation time have been measured from the transient response of the magnetization.View full abstractDownload PDF (1540K) -
T. Yazaki1968 Volume 25 Issue 4 Pages 1054-1060
Published: October 05, 1968
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe absolute Seebeck coefficient, electrical resistivity, and thermoelectric figure of merit have simultaneously measured on Bi97Sb3 and Bi90Sb10 alloy single crystals of various orientations between 77°K and 300°K. Under the assumption of independent three valley bands for both the valence and conduction bands, the electronic thermal conductivities have been calculated. They are anisotropic and the larger values being those perpendicular to the trigonal axis. In the 3 at.% antimony alloy, the total thermal conductivities both parallel and perpendicular to the trigonal axis are practically constant (K||=50±5 mW/cm·deg and K⊥=75±5 mW/cm·deg) between 77°K and 300°K. In the 10 at.% antimony alloy, each of them gradually increase with temperature. It seems that most of heat are transported by carriers in the studied temperature range in both alloys.View full abstractDownload PDF (1020K) -
A. Morita, M. Watabe1968 Volume 25 Issue 4 Pages 1060-1068
Published: October 05, 1968
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA general formulation for the spectral intensity of the soft X-ray emission of light metals is developed by using Green’s function method. In this formulation the spectral intensity of soft X-ray emission is related to the radiative level-broadening of the inner-shell level which is given by the imaginary part of the self-energy of the inner-shell hole due to electron-photon interaction. Its applications are made to explain the low energy tail and the hump at the high energy edge of the L2,3-emission of sodium.View full abstractDownload PDF (1044K) -
Hideaki Ikoma1968 Volume 25 Issue 4 Pages 1069-1081
Published: October 05, 1968
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMeasurements of transport properties are reported on n-type GaAs with carrier concentrations of ∼1014 cm−3 and ∼1015 cm−3 and on p-type GaAs with carrier concentration of ∼1016 cm−3 converted from n-GaAs by heat treatments. The Hall coefficient and the resistivity have been measured as functions of temperature from 53°K to 400°K for n- and p-type samples and the resistivity has been measured as a function of hydrostatic pressure up to 15Kbar for n-type samples. The variations in the carrier concentration are explained by the presence of non-shallow donors of ionization energy ∼(0.2+1.05×10−5P(bar))eV and ∼(0.14+1.2×10−5P(bar))eV in n-GaAs, and that of non-shallow acceptors having ionization energy of 0.12 eV in p-GaAs, For n-GaAs, scatterings due to polar mode, ionized impurities and “space charge” regions produced by inhomogeneities play important roles in determining the mobility. For p-GaAs, polar optical mode scattering is the most dominant scattering mechanism and deformation potential and ionized impurity scatterings are possibly effective.View full abstractDownload PDF (1692K) -
Yasutaka Watanabe, Nobuyuki Saito, Yoshio Inuishi1968 Volume 25 Issue 4 Pages 1081-1091
Published: October 05, 1968
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSA study of the dependence of the carrier mobilities on temperature and crystal thickness in orthorhombic sulphur crystals was performed using 0.4 μsec X-ray pulses in order to avoid surface effect.
The saturation of the collected charge at applied fields exceeding 40 kV/cm was found to be due to the so-called “schubweg effect.” At 290°K the values of schubweg per unit field for electrons and holes are estimated at 6×10−7 and (1−5)×10−6cm2V−1, respectively. With the mobility data, the results lead to the lifetimes of 800 μsec for electrons and 66 μsec for holes.
The number of carrier pairs generated by X-rays is relatively insensitive to temperature. The energy necessary to create an electron-hole pair lies between 16 and 30 eV. The effect of excitons on carrier generation may be important in uniform excitation by X-rays.View full abstractDownload PDF (1272K) -
Kumao Hisano1968 Volume 25 Issue 4 Pages 1091-1099
Published: October 05, 1968
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe infrared emission spectra of LiF single crystals and thin slabs were measured as functions of temperature, emission angle and thickness. The relationship between the normal emissivity and the reflectivity experimentally determined has been discussed in connection with Kirchhoff’s law. The frequency and width of the thermal emission due to the virtual modes in LiF slab have been given as functions of temperature and thickness of the slabs. Measurements were performed at temperatures 420°K and 605°K and at emission angles ranging from 0° to 30°. Results of measurements and those of calculations have been discussed on the basis of the virtual mode theory.View full abstractDownload PDF (1084K) -
M. Yoshimine1968 Volume 25 Issue 4 Pages 1100-1119
Published: October 05, 1968
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMolecular properties of the four alkaline-earth oxides BeO, MgO, CaO and SrO in the 1Σ ground state, computed in close to the Hartree-Fock approximation, are presented. Computed properties are total energies, dissociation energies, electric dipole and quadrupole moments, forces on the nucleus, field gradients at the nucleus and other mean values. Potential curves, spectroscopic constants, dipole moment function, μ(R), and variation of field gradients with internuclear separation are also presented and discussed. Although the computed sign of the dipole derivative dμ⁄dR at the equilibrium internuclear separation is negative only for MgO and positive for others, the fact that the computed sign for MgO and also the observed sign for SrO are negative suggests that dμ⁄dR for CaO may also have the negative sign. This indicates that the charge distribution in the alkaline-earth oxide can not be described by a simple polarizable ion-pair model. Crude estimates of magnetic properties of the molecules are made and discussed.View full abstractDownload PDF (2476K) -
Hiroo Natsume, Giichi Shimizu, Masayoshi Sakamoto1968 Volume 25 Issue 4 Pages 1120-1126
Published: October 05, 1968
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSTime-dependent properties of the strain amplitude dependent internal friction in alkali halide crystals were systematically investigated. The measurement technique more reliable than the conventional one was established, and repeatable enhancement and recovery of the internal friction due to external excitation was discovered.
A new procedure for the Granato-Lücke plot was derived from recovery of the internal friction. At the same time, this procedure itself shows validity of the Granato-Lücke theory. The enhancement and recovery was interpreted in terms of the diffusion process of pinning elements during breakaway and the counter-diffusion process of pinning elements during resting of the dislocation-motion. The nature of hysteresis phenomena in internal friction measurements in NaCl crystals was also interpreted by the same mechanism.View full abstractDownload PDF (764K) -
Tomoya Ogawa1968 Volume 25 Issue 4 Pages 1126-1128
Published: October 05, 1968
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe spontaneous polarizations of hexagonal ZnS, CdS and ZnO crystals are estimated from the refractive indices and Pockels coefficients at 2.2, 2.8 and 5.8 μ coul/cm2, respectively.View full abstractDownload PDF (224K) -
Kenkichi Okada, Hiroshi Sugie1968 Volume 25 Issue 4 Pages 1128-1132
Published: October 05, 1968
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSAntiferroelectric properties of Cu(HCOO)24H2O and Cu(HCOO)24D2O were investigated experimentally. Dielectric constant as a function of temperature shows a behavior of the first order transition with a large discontinuity at the transition. The transition point is shifted from −37.7°C for hydrogenous crystal to −27.7°C by deuterium substitution. The Curie-Weiss constant for dielectric constant above the transition is 3.1×104°C in both crystals. Typical double hysteresis loop was observed in the antiferroelectric phase under a pulsive sinusoidal electric field. From the double loops at various temperatures, critical field to induce a forced transition and spontaneous polarization of sublattice as function of temperature were obtained. The critical field shows a linear dependence on temperature and it stays finite at the transition point. The spontaneous polarization is almost constant of 6 μ coul/cm2 and shows discontinuous vanishing at the transition point. This value agrees well to the calculated value from the transition entropy.View full abstractDownload PDF (644K) -
Takashi Towyama, Itsuo Morita, Masakazu Ishiguro1968 Volume 25 Issue 4 Pages 1133-1138
Published: October 05, 1968
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe luminescence in pure CsI and CsI:Tl crystals containing various concentrations of Tl have been measured upon excitation by beta rays over the temperature range from −180°C to +20°C. The emission spectra in pure CsI at low temperatures have two peaks whose temperature dependence are different each other. In the case of CsI: Tl, the temperature dependence of the luminescence near 400 mμ is quite different from that of longer wavelength luminescence. In the longer wavelength region around 500 mμ, several glow peaks are observed from the samples of higher concentration of Tl. The process of luminescence in CsI:Tl are roughly explained by using the self trapped hole model.View full abstractDownload PDF (604K) -
H. Kamimura, T. Yamaguchi1968 Volume 25 Issue 4 Pages 1138-1147
Published: October 05, 1968
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA new mechanism which makes a forbidden transition allowed by the Jahn-Teller interaction. Firstly the line shape of this Jahn-Teller induced transition at high temperature is calculated by using the Franck-Condon approximation. The main results are: In “Case A” of the singlet ground state and the nearly degenerate excited state the Jahn-Teller induced transition appears as a broad band while in “Case B” in which both the ground and excited states are nearly degenerate, it appears as a very sharp peak. Secondly its intensity and peak position at low temperature are calculated quantum mechanically. In the static limit of the Jahn-Teller interaction, the transition is too weak to be observed in Case A while it appears as a single absorption line in Case B. In the dynamical regime, the Jahn-Teller induced transitions disappear because of the motional narrowing.View full abstractDownload PDF (1136K) -
Kenji K. Kobayashi1968 Volume 25 Issue 4 Pages 1147-1153
Published: October 05, 1968
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe collective proton tunneling mode is derived in hydrogen bonded biopolymers, in particular, in α-helical polypeptides. The coupling of this mode with an acoustical vibration of residues is investigated. Some remarks on the signal transmission in biopolymers are given in terms of these modes.View full abstractDownload PDF (724K) -
Michio Matsuzawa1968 Volume 25 Issue 4 Pages 1153-1155
Published: October 05, 1968
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIt is shown that the Landau-Zener-Stückelberg formula is applicable to perturbation induced in elastic scattering between heavy particles and can explain its several features. Inelastic differential scattering is also discussed based on this formula.View full abstractDownload PDF (284K) -
Tsuguhiro Watanabe, Yukio Midzuno1968 Volume 25 Issue 4 Pages 1156-1161
Published: October 05, 1968
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSLongitudinal waves propagating across a magnetic field are studied theoretically. It is assumed that electrons and ions of the plasma have shifted Maxwellian velocity distributions with mean velocities perpendicular to the magnetic field and different from each other. The minimum relative velocity between electrons and ions for the onset of an instability is obtained in terms of collision frequencies and other parameters. The wave number k of the wave excited at the minimum relative velocity Vmin is given by kVmin≈ωce(electron cyclotron frequency) and the corresponding frequency is ω≈kviT(viT is ion thermal velocity) in the rest frame of ions. Some numerical analyses are made to confirm the conclusions and to show the characteristic harmonic structure of frequency spectra.View full abstractDownload PDF (664K) -
M. K. Jain, P. B. Bhaskara Rao1968 Volume 25 Issue 4 Pages 1162-1170
Published: October 05, 1968
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe stability of a second order fluid confined between two concentric rotating cylinders, in the presence of a transverse pressure gradient, is analysed for the case when the gap between the cylinders is small. The resulting eigen value problem is solved by using a ‘modified Galerkin technique’. The critical Taylor number is computed for a wide range of values of the nondimensional parameter S(visco-elastic and cross-viscous parameter) and Q, the ratio of average velocity of pumping to the average velocity of rotation. It is found that the flow is stabilized for negative values of S and is destabilized for positive values of S, except for a particular range of values of Q.View full abstractDownload PDF (704K) -
Mihir B. Banerjee1968 Volume 25 Issue 4 Pages 1171-1173
Published: October 05, 1968
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA discussion is presented on the stability of a heterogeneous layer of an inviscid fluid confined between two rigid horizontal parallel planes and heated uniformly from above. The basic nonhomogeneity of the fluid, which depends only on the vertical coordinate (z) is assumed to be of the form ρ=ρ0[1+δz], δ being positive and of the order of αβ where α is the coefficient of volume expansion of the fluid and β is the uniform nonadverse temperature gradient which is maintained. The system is shown to be stable.View full abstractDownload PDF (300K) -
Hideyuki Niimi, Hiromasa Torii1968 Volume 25 Issue 4 Pages 1174-1178
Published: October 05, 1968
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA two dimensional steady MHD jet of a radiating perfectly conducting perfect gas is investigated when it is confined by the vacuum magnetic field in a space between parallel flat walls. The walls are assumed to be perfectly conducting and to have a temperature different from that of the jet. Quasi-one dimensional approximations are made to obtain the distributions of the physical quantities along the axis of the jet. Especially, the shape of the jet is discussed in detail and the existence of three types of flow including the choking phenomenon is found out.View full abstractDownload PDF (468K) -
Kanefusa Gotoh1968 Volume 25 Issue 4 Pages 1178-1185
Published: October 05, 1968
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe stability of a free boundary layer in the presence of an aligned uniform magnetic field is investigated at large values of the Reynolds number R.
The wave-number α and the phase velocity cr of the neutral disturbances are calculated as functions of the Alfvén number A and the magnetic Prandtl number γ. It is found for the case γ>O(1) that cr=0, α is independent of γ and the critical Alfvén number is 1.View full abstractDownload PDF (824K) -
Kameo Ishii, Seizaburo Kageyama1968 Volume 25 Issue 4 Pages 1186
Published: October 05, 1968
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Kohji Ohbayashi, Shuichi Iida1968 Volume 25 Issue 4 Pages 1187
Published: October 05, 1968
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Norio Tsukiji, Yoshiaki Takahashi, Hiroshi Fujiwara, Eiji Tatsumoto1968 Volume 25 Issue 4 Pages 1188
Published: October 05, 1968
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Takurô Nakamichi1968 Volume 25 Issue 4 Pages 1189
Published: October 05, 1968
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Hitoshi Yamazaki1968 Volume 25 Issue 4 Pages 1190
Published: October 05, 1968
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Carlo Reale1968 Volume 25 Issue 4 Pages 1191
Published: October 05, 1968
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Kenzô Kai, Takurô Nakamichi, Mikio Yamamoto1968 Volume 25 Issue 4 Pages 1192
Published: October 05, 1968
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Shin-ichi Katsuki, Mikio Tsuji1968 Volume 25 Issue 4 Pages 1193
Published: October 05, 1968
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Toshiharu Inoue, Tosiro Tomotika1968 Volume 25 Issue 4 Pages 1194
Published: October 05, 1968
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Toshio Mori, Etsuro Sawaguchi1968 Volume 25 Issue 4 Pages 1195-1196
Published: October 05, 1968
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Uichi Itoh, Hiroyuki Anzai1968 Volume 25 Issue 4 Pages 1196
Published: October 05, 1968
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Masahiro Saidoh, Noriaki Itoh, Motoji Ikeya1968 Volume 25 Issue 4 Pages 1197
Published: October 05, 1968
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Minoru Mihara, Toshiyuki Ninomiya1968 Volume 25 Issue 4 Pages 1198
Published: October 05, 1968
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Michitaka Terasawa1968 Volume 25 Issue 4 Pages 1199
Published: October 05, 1968
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Hiroshi Ezawa, Hiroshi Namaizawa1968 Volume 25 Issue 4 Pages 1200
Published: October 05, 1968
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Takahiro Kasuya, Arimichi Minoh, Koichi Shimoda1968 Volume 25 Issue 4 Pages 1201
Published: October 05, 1968
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Yasutugu Takeda, Isao Matsui1968 Volume 25 Issue 4 Pages 1202
Published: October 05, 1968
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Yoshihiko Yamashita, Hiroshi Yoshimoto1968 Volume 25 Issue 4 Pages 1203
Published: October 05, 1968
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