All issues
Volume 44 (1978)
- Issue 6 Pages 1759-
- Issue 5 Pages 1405-
- Issue 4 Pages 1053-
- Issue 3 Pages 695-
- Issue 2 Pages 353-
- 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 44, Issue 6
Displaying 1-41 of 41 articles from this issue
- |<
- <
- 1
- >
- >|
-
Yoshio Kuramoto, Masamichi Morimoto1978 Volume 44 Issue 6 Pages 1759-1767
Published: June 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSGround state properties of the electron-hole system in a strong magnetic field are investigated throughout the whole density range. By use of a variational formalism which takes account of the electron-hole pairing, explicity derived are the momentum distribution, the electron-hole pair amplitude and the single-particle excitation spectrum. The ground state energy is computed not only variationally but also in the random phase approximation (RPA). The result shows that there exist both gas and liquid excitonic phases each of which has characteristic nature of the electron-hole pairing. Qualitative discussions are given as to semimetals and highly excited semiconductors with emphasis on the presence of incoherent excitons.View full abstractDownload PDF (1160K) -
Shunichi Muto, Takehiko Oguchi1978 Volume 44 Issue 6 Pages 1768-1773
Published: June 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA system composed of Ising spins on the Bethe lattice having the antiferromagnetic nearest neighbour interactions and the ferromagnetic infinite range interactions independent of distance is treated rigorously in the presence of external field. The interesting phase diagram is obtained, which is compared with the result by the mean field approximation.View full abstractDownload PDF (560K) -
Natsuki Mori, Hajime Ozaki1978 Volume 44 Issue 6 Pages 1774-1781
Published: June 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe superconducting proximity effect is theoretically investigated in the case of the presence of non-magnetic localized states at the interface. To describe the proximity effect the resonance scattering by impurities is considered in addition to the direct tunneling of the McMillan model. It is shown that the presence of the localized states gives an enhanced coupling between a superconductor and a normal metal due to the resonance tunneling. The excitation spectrum of the present model is similar to that of the McMillan model for large impurity concentrations even without the direct tunneling, whereas the difference between the two models is appreciable for small concentrations. Effect of the Coulomb repulsion between the localized electrons is briefly discussed.View full abstractDownload PDF (960K) -
Yasuo Yamaguchi, Hiroshi Watanabe1978 Volume 44 Issue 6 Pages 1782-1786
Published: June 15, 1978
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSCr2As and Mn2As, both being isomorphous with Cu2Sb type crystal structure, have been known as antiferromagnets with different magnetic structures. They are found to form a series of solid solutions with isomorphous replacement of chromium by manganese. Site preference of each kind of atom is observed that chromium occupies site-I of this crystals structure in preference to site-II. The solid solutions are found to be antiferromagnets in the whole range of composition. (Cr1−xMnx)2As system is divided into three regions in terms of the magnetic structure. In the first region 0.0≤x≤0.24, the magnetic structure is the same as Cr2As. Second (intermediate) and third (manganese rich) regions are in the range of 0.25≤x≤1.0. In the third region, the magnetic ordering is of Mn2As type. A new magnetic structure, which is observed in the second region, is understood as the intermediate spin structure between Cr2As and Mn2As structures.View full abstractDownload PDF (636K) -
Shuzi Harada, Satoru Ohno, Shigeru Tamaki1978 Volume 44 Issue 6 Pages 1787-1792
Published: June 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe static susceptibilities of dilute 4d-transition solutes in liquid tellurium have been measured. The additional susceptibilities show non-magnetic behaviour and are interpreted in terms of the virtual bound state (v.b.s.) of solute ions. Using the experimental data, the half-width Δ of v.b.s. and the effective intra-atomic d-d interaction are estimated as 2.2 eV and 6.0 eV, respectively.View full abstractDownload PDF (536K) -
Masayuki Kawakami, Michio Sato, Hidetoshi Hiroyoshi1978 Volume 44 Issue 6 Pages 1793-1796
Published: June 15, 1978
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSSaturation magnetization of fcc Ni–Co and Co–Fe alloys containing Mn dilutely has been measured at 4.2 K in fields up to 40 kOe as a function of alloy composition. From interpolation of the results at compositions where fcc phase is metallurgically stable, the magnetic moment per Mn atom μMn in fcc Co has been determined to be +1.7±0.05 μB. This result is different both in sign and in magnitude from previous results. Saturation magnetization of hcp Co containing Mn dilutely has also been measured in fields up to 100 kOe. The value of μMn has been determined to be −7.5±0.5 μB.View full abstractDownload PDF (504K) -
Shin-ichi Kuroda, Mitsuhiro Motokawa, Muneyuki Date1978 Volume 44 Issue 6 Pages 1797-1803
Published: June 15, 1978
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSSubmillimeter ESR in cobalt ammonium Tutton salt (NH4)2Co(SO4)2·6H2O was studied at liquid nitrogen temperature using pulsed high magnetic fields and two submillimeter waves, 337 μm of HCN laser and 119 μm of H2O laser. The frequency dependence of the g value was observed. For example, g|| at 119 μm was about 2% smaller than that at 337 μm. The observed frequency dependence can be explained by introducing a new SH3 term in the effective spin Hamiltonian. An extensive theoretical consideration based on the Abragam-Pryce theory shows that the observed shift can satisfactorily be explained quantitatively. This is the first experimental observation of SH3 term of the iron group ions in ionic crystals.View full abstractDownload PDF (816K) -
Mitsuhiro Motokawa1978 Volume 44 Issue 6 Pages 1804-1808
Published: June 15, 1978
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSMagnetization process is precisely measured on a single crystal of CuCl22H2O at 1.1 K using a pulsed magnetic field up to 180 kOe. Transitions from the antiferromagnetic to the paramagnetic states are observed at 150±2, 161±2 and 146±2 kOe when external fields are applied parallel to the a, b and c-axes, respectively. From these results, an antiferromagnetic exchange interaction along the c-axis is determined as J=3.83±0.05 cm−2. It is also shown from a nonlinear magnetization curve that the zero-field spin reduction due to zero-point motion is 28.4±0.4%.View full abstractDownload PDF (556K) -
Yoshikazu Endo, Takuma Ishikawa1978 Volume 44 Issue 6 Pages 1809-1815
Published: June 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe temperature dependence of the EPR spectra is studied for a weakly exchange-coupled spin system with a single-ion anisotropy. The method of moments is generalized in order to take into account the collective motion of spins. The first two moments are calculated in the molecular-field approximation and are applied to a system with a hard-axis crystal-field anisotropy. The EPR linewidths are seriously affected by the soft-mode behavior of the collective mode immediately before the appearance of a transverse ordering.View full abstractDownload PDF (772K) -
Masayuki Kawakami1978 Volume 44 Issue 6 Pages 1816-1820
Published: June 15, 1978
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSTemperature dependence of the 55Mn nuclear resonance frequency in Fe–Co, Fe–Ni, Ni–Co and Ni–Cu alloys containing 3 at%Mn has been measured by spin echo technique over a range from 4.2 K to room temperature in zero external field, and the dependence has been studied as a function of e⁄a. Here, e is the number of electrons in host, and a is the number of host atoms. The temperature dependence in the bcc phase of 8.4≤e⁄a≤8.8, is found to be slow compared with that of spontaneous magnetization. On the other hand, the temperature dependence in the fcc phase of 8.9≤e⁄a≤10.0, is found to be rapid. In this fcc region, the deviation of the reduced frequency from the reduced magnetization at a given reduced temperature increases monotonically with decreasing e⁄a.View full abstractDownload PDF (532K) -
Hideo Hasegawa1978 Volume 44 Issue 6 Pages 1821-1830
Published: June 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWe investigate the effect of spin fluctuations in isoelectronic alloys, AxB1−x, by using the self-consistent renormalization (SCR) theory combined with the coherent potential approximation (CPA). The static susceptibility, the Knight shift, Ki(i=A, B), and the nuclear spin-lattice relaxation time, T1i, relevant to each constituent atom of the alloy are calculated as functions of concentration, x, and of the temperature, T. The relation that (γAnKA)2T1A=(γBnKB)2T1B is shown to hold irrespective of x and T, where γin is the nuclear-gyromagnetic ratio of the nucleus of the i-atom. Since the CPA breaks down near the critical point, at which the susceptibility diverges, we adopt the virtual-crystal approximation in place of the CPA for the study of the Curie temperature, which is given by Tc∝(xc−x)6⁄7 very near the critical concentration, xc. Numerical calculations are made for the electron-gas model.View full abstractDownload PDF (1240K) -
Koichi Mizushima, Koichi Nakao, Shigeru Tanaka, Shuichi Iida1978 Volume 44 Issue 6 Pages 1831-1833
Published: June 15, 1978
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSConductivities and dielectric constants of the low temperature phase of Fe3O4 at a microwave frequency were measured by a cavity perturbation method. The conductivity in the c direction is about three times as large as that in the a and b directions. From the result it is expected that for an ion on B site the nearest neighbour ions of the same valency are in the [±1, 0, 1], [0, ±1, 1] directions which have components along the c direction.View full abstractDownload PDF (372K) -
L. P. Pathak, R. C. Rai, M. P. Hemkar1978 Volume 44 Issue 6 Pages 1834-1838
Published: June 15, 1978
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe frequency-wave vector dispersion relations for the normal modes of vibration in the major symmetry directions of transition metals chromium and tantalum have been computed on the basis of modified non-central force model of Behari and Tripathi which takes into account Clark et al. type angular forces and Sharma and Joshi type volume forces. The results show a satisfactory agreement with the curves obtained from recent coherent inelastic neutron scattering experiments. Blackmann’s root sampling technique for a discrete subdivision in the reciprocal space is used to determine the frequency spectra. The calculated frequency spectra have been incorporated in the study for the computations of specific heats and equivalent Debye-temperatures of these metals. The results show a reasonably satisfactory agreement with experiments.View full abstractDownload PDF (488K) -
Jun-ichi Wakabayashi, Shinji Kawaji1978 Volume 44 Issue 6 Pages 1839-1849
Published: June 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe channel conductance and the Hall voltage in a wide and a long rectangular samples of n-type MOS inversion layers on Si(100) surfaces are measured in a strong magnetic field of 100 kOe at 1.6 K. A method of transformation from the conductance and the Hall voltage data to the transverse conductivity σxx and the Hall conductivity σxy in arbitrary magnetic field strength based on the Hall-effect field correction are described. The conductivity σxx and σxy are compared with σxx measured directly in a Corbino disk sample and σxy predicted by the quantum transport theory and the electron mobility data. Good agreement is obtained only in the wide sample by the use of a modified Hall-effect field correction. Effects of the electrode resistance, the side edges and the sample geometry are discussed in connection to the modification of the Hall-effect field correction.View full abstractDownload PDF (1368K) -
Kenichiro Takahei, Koichi Kobayashi1978 Volume 44 Issue 6 Pages 1850-1860
Published: June 15, 1978
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSElectronic state of TlCl–TlBr mixed crystals is investigated optically by focusing a particular attention on a role of bromine ions. In Cl-rich crystals, a Stokes-shifted emission band due to bromine is observed. The dependence of its peak energy on exciting photon energy and the time decay of its peak intensity are explained in terms of hole relaxation to the self-trapped states at bromine clusters. In the bromine concentration range of 0.3–0.4 mole fraction, the emission spectrum changes abruptly and above this concentration, only an edge emission is observed. This shows a transition from the impurity-induced self-trapped hole state to a free hole state and it is discussed in relation to the percolation of bromine ions. The presence of a small but abrupt deviation of lattice constant from Vegard’s law at this concentration is also pointed out.View full abstractDownload PDF (1656K) -
Masami Fujita, Nobuhito Ohno, Kaizo Nakamura1978 Volume 44 Issue 6 Pages 1861-1868
Published: June 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSPiezo-modulated reflection spectra of the first exciton band of TlCl and TlBr are investigated at liquid helium temperature. Both the energy shift and the change in oscillator strength caused by [001] stress are observed for each component of the doublet structure in the first peak. Stress response is analysed in terms of intra- and intervalley interactions of excitons at inequivalent X points in the Brillouin zone. Diagonal term E3−E1 and off-diagonal term Miv in the Hamiltonian of the intra- and intervalley interactions are estimated. Tetragonal deformation potential constant D13 is also obtained. Results are E3−E1=1.9±0.3 meV, Miv=0.9±0.2 meV and D13=1.6±0.3 eV for TlCl and E3−E1=1.3±0.4 meV, Miv=0.2±0.5 meV and D13=0.4±0.2 eV for TlBr.View full abstractDownload PDF (1140K) -
Kenji K. Kobayashi1978 Volume 44 Issue 6 Pages 1869-1872
Published: June 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA coupled phonon-linear Heisenberg chain system is investigated which is exactly soluble and exhibits a second order phase transition quite similar to the Dicke model of superradiance.View full abstractDownload PDF (420K) -
Masayuki Udagawa, Kay Kohn, Terutaro Nakamura1978 Volume 44 Issue 6 Pages 1873-1880
Published: June 15, 1978
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe Brillouin scattering studies on lithium ammonium tartrate monohydrate (LAT) have been made in paraelectric phase. The elastic stiffness constants C55p and C55E vanish at T0=94.5 K and Tc=97.5 K, respectively. Some Raman scattering spectroscopies of this crystal have been also made. From the phenomenological theory and the discussion of the elastic dispersion, LAT has been concluded to undergo the proper ferroelastic transition, or, the soft mode in LAT is an acoustic phonon of which energy is determined by C55p. Measurements of refractive indices at room temperature are reported.View full abstractDownload PDF (1048K) -
Syuji Kawada1978 Volume 44 Issue 6 Pages 1881-1886
Published: June 15, 1978
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe complex dielectric constants parallel and normal to the optical axis in ice Ih single crystal were measured in a wide range of the temperature (0°∼−150°C). The static dielectric constant of the Debye component at each temperature was obtained by extrapolating on the Cole-Cole plot to zero frequency. Dielectric anisotropy agreed well that of Humbel et al. at high temperatures, and it increased with decreasing temperature.
The static dielectric constant εs⁄⁄ followed a Curie-Weiss law where T0 was 46 K and its Curie-Weiss constant C⁄⁄ was 2.25×104 K, while εs⊥ obeyed a Curie law where Curie constant C⊥ was 2.37×104 K. These results strongly suggest the anisotropy in dipole-dipole interaction and the possibility of the ordering phase transition at low temperatures. The anisotropy of the dielectric relaxation time was very small in all temperature range. The mechanism of the dielectric anisotropy is discussed.View full abstractDownload PDF (716K) -
Ichiro Hatta, Yasuo Shimizu, Katsumi Hamano1978 Volume 44 Issue 6 Pages 1887-1893
Published: June 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe temperature dependence of the elastic constants c11, c22, c33, c44, c55 and c66 of NaNO2 was determined in the wide temperature range from 20 to 200°C. Near the antiferroelectric transition temperature (TN), c33, c44, c55 and c66 are rather normal and show a slight bending at TN. On the other hand c11 and c22 show softening towards TN. Corresponding to the anisotropic behavior of the elastic constants, the ultrasonic attenuation coefficients associated with c11 and c22 exhibit critical behavior and those associated with c33 and c55 show normal temperature dependence. The above character in the elastic properties can be explained in terms of the anisotropic coupling constants between the elastic strains and the staggered polarization expected from a crystal symmetry consideration.View full abstractDownload PDF (852K) -
Masaharu Tokunaga, Toshirou Yagi1978 Volume 44 Issue 6 Pages 1894-1900
Published: June 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSFourier transforms of the dipole-dipole interaction D(q) are computed in orthorhombic simple, body-centered and face-centered lattices. The ratios of the lattice constants a and b to the lattice constant c are varied as parameters. The modulation wave vectors qmin where D(q) takes the minimum value are shown in a⁄c–b⁄c planes. Sinusoidal arrays are found to be of the minimum energy in wide regions in these planes in the cases of body-centered and face-centered lattices. Contributions to D(q) from sublattices are separately calculated. The different a⁄c and b⁄c dependences of them are found to result in the deviation of qmin from the origin (the ferroelectric array) or zone boundaries (antiferroelectric arrays) in the q-space.View full abstractDownload PDF (740K) -
Mitsuo Yamaga, Hide Yoshioka1978 Volume 44 Issue 6 Pages 1901-1908
Published: June 15, 1978
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSElectron spin resonance study shows that holes in AgBr0.001Cl0.999 crystal are self-trapped as the complexes (AgBrCl5)4− besides the complexes (AgCl6)4−. The complex (AgBrCl5)4− has a rhombic symmetry due to a Jahn-Teller effect and to a tetragonal crystal field created by a Br ligand. The energy barrier between two configurations of the complex (AgBrCl5)4− is estimated to be lower than those between three configurations of the complex (AgCl6)4−, so that we can expect occurrence of a dynamic or intermediate Jahn-Teller effect for the complex (AgBrCl5)4−. The ESR line shapes have been calculated for several values of 2Γ⁄δ, which represents the ratio of the tunneling splitting to the random strain splitting. The result shows that the low-temperature ESR spectrum of the complex (AgBrCl5)4− is associated with an intermediate Jahn-Teller effect.View full abstractDownload PDF (1036K) -
Hiizu Fujita, Michiko Inoue, William Phillips1978 Volume 44 Issue 6 Pages 1909-1917
Published: June 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe optical absorption spectrum for Co-doped LiNbO3 was measured below 25,000 cm−1 at 77 K and room temperature. The data was analyzed by the crystal field theory. Level splitting of the excited 4T1g state of Co2+ due to spin-orbit coupling and the trigonal field was identified. The results give B=850 cm−1, Dq=900 cm−1, ζ=628 cm−1, and Δe=−768 cm−1 for Co2+, and Dq=1600 cm−1 for Co3+. The circular dichroism (CD) for the 4T1g→4T1g band of Co2+ was measured in the k⊥c configuration. It is shown that CD off-resonance in this configuration is directly proportional to the difference in absorption for the ordinary and extraordinary waves and to the off-diagonal element of the dielectric tensor Im ε2′(k, ω) for the medium with |ε2′(k, ω)⁄(εe−ε0)|<<1. The observed CD shows frequency dispersion in good agreement with the phenomenological theory.View full abstractDownload PDF (964K) -
Yoji Inoko, Toshio Mitsui1978 Volume 44 Issue 6 Pages 1918-1924
Published: June 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThicknesses dl of the lipid bilayer and dw of the water layer were determined separately with X-rays for dipalmitoyl phosphatidylcholine lamellar phase. In both cases of the presence and the absence of excess water, dl does not change appreciably at the pretransition (35°C) but drops down by about 5 Å at the main transition (42°C) with increasing temperature. In the presence of excess water, dw jumps up by 4.0 Å at the pretransition and by 2.0 Å at the main transition. These results prove that there is practically no change of the tilting angle of hydrocarbon chains at the pretransition and that the remarkable increase of the repeat distance of the lamellar phase at the pretransition in the presence of excess water is caused by the increase of the thickness of the water layer.View full abstractDownload PDF (832K) -
Shozo Tsunekawa, Takeshi Kojima1978 Volume 44 Issue 6 Pages 1925-1930
Published: June 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMicrowave spectrum of hydrazine-d4(N2D4) has been observed in the range from 8 to 100 GHz. The inversion splitting is found to be 443 MHz, which is to be compared with 7974 MHz in N2H4. The rotational constants of N2D4 have been determined to be A=74724.3 MHz, B=18501.9 MHz, C=18437.5 MHz, and the barrier height to inversion to be 2120 cm−1 by using a Manning potential function.View full abstractDownload PDF (656K) -
Hiroshi Wako, Nobuhiko Saitô1978 Volume 44 Issue 6 Pages 1931-1938
Published: June 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA one-dimensional lattice gas with long-range many-body interactions is studied by a matrix method for the model of the transition between native and denatured states of globular proteins. The interactions in our model have the nature that two particles situated on two different sites can interact with each other only when all sites between them are occupied by other particles, or in other words, only when they are in a same island which is formed by particles situated side by side. In this system a phase transition occurs in the limit of the infinite long-range interaction and under certain potential functions. The sharpness and the all-or-none type property of the transitions are discussed from the nature of interaction.View full abstractDownload PDF (912K) -
Hiroshi Wako, Nobuhiko Saitô1978 Volume 44 Issue 6 Pages 1939-1945
Published: June 15, 1978
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe theory of a one-dimensional lattice gas with long-range many-body interactions is applied to the folding pathways of proteins. This model presents the quantitative informations about the order of inter-residue interactions, the location of nucleation and so on. Three typical proteins are cited as examples and their folding pathways are traced according to the computation of some useful properties.View full abstractDownload PDF (848K) -
Akira Takahashi1978 Volume 44 Issue 6 Pages 1946-1952
Published: June 15, 1978
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe chemical potential for the complex consisting of the water molecules co-ordinated to Al+++ in water is discussed. The use of the data obtained in a previous paper Part II [A. Takahashi: J. Phys. Soc. Japan 43 (1977) 976.] for the rate constants for the motions of the hydration water molecules leads to a reasonable conclusion that when one water molecule in the second layer in the complex transfers to the adjacent equilibrium position in the solvent water, the number of the hydrogen bond between this molecule and the solvent water molecule increases by one bond, which forms a momentary stable state in the system. This conclusion confirms that several approximations made in Part II for the rate constants of the molecular motions are valid.View full abstractDownload PDF (860K) -
Hideo Sugai, Masanori Sato, Kazuo Ido, Susumu Takeda1978 Volume 44 Issue 6 Pages 1953-1959
Published: June 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSEffects of finite plasma dimension on the whistler wave propagation in a dense plasma (ωp2>>ωc2) are investigated theoretically and experimentally. Dispersion relation for whistler waves in a cylindrical plasma of radius a is solved and compared with the infinite plane wave solution. For ωpa⁄c\lesssim10, the finite size effects become so significant that, below half the electron cyclotron frequency ωc, the phase velocity and the damping rate increase in comparison with the infinite case. Measured dispersion and attenuation are well described by the finite plasma theory.View full abstractDownload PDF (880K) -
Tatsuo Sugie, Hiroshi Takeuchi, Satoshi Kasai, Akimasa Funahashi, Koki ...1978 Volume 44 Issue 6 Pages 1960-1967
Published: June 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe radial profile and scaling law of ion temperature were examined on hydrogen plasmas in the DIVA tokamak device with its toroidal magnetic field upgraded from 10 to 20 kG. The radial profile of ion temperature was measured from the Doppler broadening of various impurity lines in vacuum uv and ultraviolet regions which were experimentally confirmed to emit from a localized position in the minor cross-section and from the energy spectrum of charge-exchanged fast hydrogen-atoms. The radial profiles obtained from these two methods were in agreement in the inner region ((r⁄a)\lesssim0.6 with the minor radius a of the device). The central ion temperatures were investigated in the wide parameter ranges: toroidal magnetic fields 6≤Bt≤20 kG; plasma currents, 10≤Ip≤48 kA; and averaged electron densities 0.6≤\barne≤3.8×1013 cm−3. The obtained central ion temperatures were found to be in good agreement with Artsimovich’s scaling law.View full abstractDownload PDF (956K) -
Tutomu Kawata, Hiroshi Inoue1978 Volume 44 Issue 6 Pages 1968-1976
Published: June 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe inverse method related to a modified Zakharov-Shabat eigen value problem with nonvanishing potentials q(x) and r(x), where q(±∞)r(±∞)=λ20\lessgtr0 is developed. There exists a certain class of the nonlinear evolution equations which are solvable by this method. As the most primitive case a derivative nonlinear Schrödinger equation, iqt+qxx−mi(|q|2q)x=0(m=−1, +1), is solved under the nonvanishing boundary condition, |q|2→mλ02 as x→±∞. There appear paired-solitons because of the nonvanishing condition. One paired-soliton solution is obtained with the closed form. This solution shows an algebraic behaviour under a certain limiting condition.View full abstractDownload PDF (900K) -
Akira Yoshizawa, Masayuki Sakiyama1978 Volume 44 Issue 6 Pages 1977-1980
Published: June 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe equation governing the motion of small eddies in turbulent flows is considered in connection with the physical background of Kolmogorov’s −5⁄3 power law. The nonlinear interaction in the Navier-Stokes equations is decomposed into the interaction of convection type between small and big eddies and that of distortion type among small eddies themselves. It is shown that an equation based on the distortion-type interaction only can be obtained by the use of a Galilean transformation. This equation is free from the difficulty of the divergence of the response equation at low wave numbers which is a stumbling block to the analytical derivation of Kolmogorov’s law.View full abstractDownload PDF (388K) -
Yoshio Sone, Yoshimoto Onishi1978 Volume 44 Issue 6 Pages 1981-1994
Published: June 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe steady behavior of a gas in contact with its condensed phase of arbitrary shape is investigated on the basis of kinetic theory. The Knudsen number of the system (the mean free path of the gas molecules divided by the characteristic length of the system) being assumed to be fairly small, the hydrodynamic equations for the macroscopic quantities, the velocity, temperature, and pressure, of the gas and their boundary conditions on the interface of the gas and its condensed phase are derived, and two simple examples (evaporation from a sphere, two-surface problem of evaporation and condensation) are worked out.View full abstractDownload PDF (1484K) -
Kenji Inoue, Atsushi Tate1978 Volume 44 Issue 6 Pages 1995-2002
Published: June 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe method of matched asymptotic expansions is applied to the problem of a parabolic cylinder in a uniform incompressible flow at high Reynolds numbers. The equations and the boundary conditions for the first-order boundary layer, the second-order outer flow and the second-order boundary layer are formulated in terms of the parabolic co-ordinate system. The equations are solved numerically by means of finite-difference approximation. The results for skin friction and surface pressure are compared with the available numerical solutions of the full Navier-Stokes equations. The application of the technique of rational fraction to the two-term asymptotic expansion for skin friction shows that a further approximation will give a better result.View full abstractDownload PDF (744K) -
Jeffrey Topper, Takuji Kawahara1978 Volume 44 Issue 6 Pages 2003
Published: June 15, 1978
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (44K) -
Mitsuo Kono, Nobuo Yajima1978 Volume 44 Issue 6 Pages 2004
Published: June 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (132K) -
S. P. Srivastava, I. D. Singh1978 Volume 44 Issue 6 Pages 2005-2006
Published: June 15, 1978
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSOn the basis of Lennard-Jones (6–12) interaction potential, the Debye temperature of molecular crystals of methane (CH4), deuterated methane (CD4), neopentane (C5H12), bicyclo [2.2.2] octane (C8H14) and adamantane (C10H16) has been studied. A general relation has been derived connecting the Debye characteristic temperature with some of the lattice properties of these solids. The results are in satisfactory agreement with those computed using centro-frequency and compressibility data.View full abstractDownload PDF (236K) -
Yasukage Oda, Hiroshi Nagano1978 Volume 44 Issue 6 Pages 2007-2008
Published: June 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe Meissner screening length in Cu of Cu clad Nb and Cu clad NbTi wire was measured over temperature range from Tc down to 25 mK. The temperature dependence of the screening length was found to be expressed by (T+T0)−1⁄2 from about 1.5 K to the lowest temperature, rather than by T−1⁄2 derived by Deutscher and de Gennes for the dirty limit. The length becomes 12 μm for Cu clad Nb and 7 μm for Cu clad NbTi wire. Preliminary measurements of field and frequency dependence are also presented.View full abstractDownload PDF (232K) -
Hirokazu Tanaka, Toshirou Yagi, Itaru Tatsuzaki1978 Volume 44 Issue 6 Pages 2009-2010
Published: June 15, 1978
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSIn the Brillouin scattering spectra of a slightly deuterated KH3(SeO3)2 crystal has been observed a central peak, of which intensity diverges near the transition temperature −58.6°C. The central peak is independent of the history of the specimen and shows VH polarization. This experimental result shows that the minor deuterium substituted for hydrogen is one of the origin of the central peak in the hydrogen-bonded ferroelastic KH3(SeO3)2.View full abstractDownload PDF (212K) -
Susumu Kurihara1978 Volume 44 Issue 6 Pages 2011-2012
Published: June 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA non-linear interaction between phase mode and amplitude mode of a charge-density wave is derived from a microscopic model. This interaction offers a new mechanism for the electrical conductivity of TTF–TCNQ in the metallic phase. Temperature dependence, magnitude and pressure dependence of the static conductivity are successfully explained.View full abstractDownload PDF (264K) -
Masakazu Ueno, Hisayuki Nakanishi, Taizo Irie1978 Volume 44 Issue 6 Pages 2013-2014
Published: June 15, 1978
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe absorption spectra of Co-doped Cd In2 S4 have been measured at 4.2 K, 90 K and 290 K. The observed spectra have been interpreted on the assumption that doped Co ions are present as Co2+ and tetrahedrally coordinated.View full abstractDownload PDF (192K)
- |<
- <
- 1
- >
- >|