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R. K. Mohindra, S. K. Gupta
1975 年 39 巻 5 号 p.
1147-1151
発行日: 1975/11/15
公開日: 2007/06/01
ジャーナル
認証あり
The existence of shell effects in (
n, 2
n) cross-sections at 14 MeV neutron energy has been controversial for more than a decade. In the present work, recently available systematised data on (
n, 2
n) cross-sections at 14.7 MeV has been reinvestigated critically in the vicinity of closed shells. These plots of σ(
n, 2
n) versus
N and (
N−
Z)⁄
A show definite shell effects at
N=20, 28 and 50 which have never been revealed so distinctly by earlier investigations. The disappearance of shell effect in heavy nuclei
N=82 has been explained. It has been demonstrated that shell closure effect is perceptible clearly only in comparison to neighbouring nuclei of same
N−
Z and pairing effects. The distinct sharp rise of σ (
n, 2
n) with (
N−
Z)⁄
A>∼0.1, has been noted to be a characteristic of closed shell or sub-shell isotones only. An empirical relation for σ(
n, 2
n) is devised, for
A≥110.
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Takesi Komatuzaki
1975 年 39 巻 5 号 p.
1152-1158
発行日: 1975/11/15
公開日: 2007/06/01
ジャーナル
認証あり
The excitation functions for the
27Al(d, α)
25Mg reaction leading up to the 14th level of the final nucleus were obtained at 90° (lab.) in the deuteron energy range from 5.7 to 8.0 MeV in steps of 25 keV.
The average values of the excitation functions over the incident energies agree well with the 2
I+1 rule for the levels of which spins have been established. By using the 2
I+1 rule spins of the 10th, 11th, 12th, 13th and 14th excited states of
25Mg were determined respectively as 5/2, 7/2, 9/2, 1/2 and 3/2 or 5/2, which are not in contradiction to the previous knowledge.
Fluctuation damping coefficients
N were calculated from the fluctuations in the excitation functions, and the validity for the use of
N values as a guide to determine the nuclear spins was examined.
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Hameed Ahmed Khan
1975 年 39 巻 5 号 p.
1159-1161
発行日: 1975/11/15
公開日: 2007/05/29
ジャーナル
認証あり
Systematic studies have been carried out regarding the track registration characteristics of Kodak CA80-15, cellulose nitrate, plastic track detectors for
11H,
23He and
24He particles. The energy per nucleon was varied from 10 MeV down to a few hundred keV. The results show that in the high energy region, the secondaries (H, C, N and O recoils and some reaction products) are responsible for the production of etchable latent damage trails. In the low energy region the tracks are almost entirely due to the slowed down primaries. The so called ‘Energy Threshold’ of these detectors for light charged particles is not constant. It varies strongly with the etching procedure.
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Upendra Singh, M. N. Sharma
1975 年 39 巻 5 号 p.
1162-1165
発行日: 1975/11/15
公開日: 2007/05/29
ジャーナル
認証あり
Two sets of the potential parameters for Xenon on Morse potential model (exp:exp) are evaluated by means of temperature dependence of thermal diffusion and temperature dependence of viscosity. In order to test the suitability of the parameters, experimental thermal conductivity data are reproduced for different temperatures in the range 300 K–500 K. A good agreement between the experimental and theoretical thermal conductivities shows that the Morse potential is a satisfactory choice for explaining the interaction forces in Xenon. It is also found that the parameters obtained by using thermal diffusion properly are superior to those obtained by using viscosity property.
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Ken’ichi Nishiyama
1975 年 39 巻 5 号 p.
1166-1168
発行日: 1975/11/15
公開日: 2007/06/01
ジャーナル
認証あり
Concrete forms of the power series in time are obtained for the moments starting from the master equation. When the series is confined to finite terms, one gets the polynomial approximations to the moments. This method may be adopted to the calculation of the transient processes of nonlinear stochastic systems. As an illustration this is applied to a simple nonlinear chemical reaction having the exact solution. Rapidity of the convergence of the series is briefly discussed.
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Hideo Aoki, Hiroshi Kamimura
1975 年 39 巻 5 号 p.
1169-1174
発行日: 1975/11/15
公開日: 2007/06/01
ジャーナル
認証あり
The Hubbard model is investigated by the Hubbard’s improved approximation (Hubbard III) with special emphasis on the importance of the resonance broadening process as compared to the CPA. The resonance broadening process gives rise to a strikingly different electronic structure in the Hubbard III for the arbitrary numbers of up and down spin electrons from those given by the CPA. The width of each Hubbard sub-band remains unchanged against the compensation or unbalancing the numbers of up and down spin electrons due to the dynamical motion of electrons of each spin. The behaviour of the system under magnetic fields with deformed Hubbard bands is also discussed.
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Nagao Ohata, Masuo Suzuki
1975 年 39 巻 5 号 p.
1175-1182
発行日: 1975/11/15
公開日: 2007/06/01
ジャーナル
認証あり
Relaxation and fluctuation of a supercurrent in a thin superconducting wire are studied from the viewpoint of statistical physics of nonlinear non-equilibrium processes with the use of a stochastic model discussed previously by Langer and Ambegaokar. It is emphasized that the supercurrent is a typical physical example to which one can apply the system-size
Ω-expansion method developed by van Kampen and Kubo. The nonlinear equations derived by van Kampen and Kubo for the deterministic path of an intensive macrovariable and the variance around it are extended so as to be used for the supercurrent. By solving the equations, nonlinear relaxation and fluctuations of the supercurrent are calculated explicitly for various initial conditions.
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Shigeharu Kabashima, Manabu Itsumi, Tatsuyuki Kawakubo, Tomomasa Nagas ...
1975 年 39 巻 5 号 p.
1183-1188
発行日: 1975/11/15
公開日: 2007/06/01
ジャーナル
認証あり
The time-dependent fluctuation with sudden changes in feed-back factor has been measured on a Wien Bridge oscillator. Also have been observed the evolution and decay processes of oscillation in its transient process. The dynamics of oscillation amplitude can be well explained by van der Pol equation. As the oscillation of output voltage corresponds to that of charge on the capacitor which constitutes a part of the bridge of the Wien Bridge oscillator, the theory of system size expansion is applicable. The time dependence of fluctuation has been analysed in terms of the theory of Kubo, Matsuo, and Kitahara. A good agreement between theoretically calculated curves and experimental results has been obtained.
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Tomoji Yamada
1975 年 39 巻 5 号 p.
1189-1195
発行日: 1975/11/15
公開日: 2007/06/01
ジャーナル
認証あり
A nonlinear theory is developed on the Hutson-White equations, which takes account of both the three and the four phonon processes. The latter processe greatly alters the nature of the instability. In analogy with the phase transition the present reference system shows the first order transition. This is different from the results of the existing theories which only include the three phonon process. The time evolution and the steady state values of acoustic flux and electrics current are numerically calculated by making use of a kinetic equation derived in the present work.
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Miki Wadati, Morikazu Toda
1975 年 39 巻 5 号 p.
1196-1203
発行日: 1975/11/15
公開日: 2007/06/01
ジャーナル
認証あり
A Bäcklund transformation associated with the equation of motion for an exponential lattice is found. It is shown that recursive application of the transformation provides an algebraic recursion formula for the solutions. Using the recursion formula, two-soliton solution is obtained and a method for constructing
N-soliton solution is presented. It is also shown that the fundamental equations of inverse method and conservation laws can be derived from the transformation.
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Morikazu Toda, Miki Wadati
1975 年 39 巻 5 号 p.
1204-1211
発行日: 1975/11/15
公開日: 2007/06/01
ジャーナル
認証あり
A canonical transformation which gives the relation between two solutions of an exponential lattice is presented. Using this relation a new solution can be obtained from a known solution. It is thus a discrete version of the Bäcklund transformation.
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Yoshihito Miyako, Taro Ito
1975 年 39 巻 5 号 p.
1212-1216
発行日: 1975/11/15
公開日: 2007/05/29
ジャーナル
認証あり
NMR and susceptibility have been observed in Ti
2O
3 with vanadium over the temperature range of 1.4∼500 K. It is confirmed that the vanadium in Ti
2O
3 has no localized magnetic moment, while the compound becomes to show a susceptibility given by a Curie-Weiss law by adding vanadium. A band model is proposed to interprete the origin of the magnetic moment and the metallic transition of V-doped Ti
2O
3.
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Tohru Morita
1975 年 39 巻 5 号 p.
1217-1225
発行日: 1975/11/15
公開日: 2007/06/01
ジャーナル
認証あり
The exact short-time, high-temperature expansion coefficients of the spin relaxation functions ψ(
t)=lim
k→0\ddotI||(
k,
t)/
k2I||(0, 0) are given for the isotropic and the uniaxial Heisenberg magnet of spin 1/2, for the linear, square, sc and bcc lattices, where
I||(
k,
t)≡〈
Skz(
t),
S−kz(0)〉. With the aid of the coefficients, estimations are given of the spin diffusion constant at high temperatures. The obtained temperature dependence of the spin diffusion constant agrees reasonably well with experimental results for RbMnF
3.
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Takashi Iwashita, Norikiyo Uryû
1975 年 39 巻 5 号 p.
1226-1232
発行日: 1975/11/15
公開日: 2007/06/01
ジャーナル
認証あり
The spin wave dispersion relations of a linear chain antiferromagnet CsMnCl
3·2H
2O have been calculated taking into consideration weak interchain interactions as well as an intrachain interaction and crystalline field potentials. With the use of the dispersion relations, the temperature dependences of the parallel and perpendicular magnetic susceptibilities and the sublattice magnetization have been calculated numerically and compared with the experiments by Kobayashi
et al. and Skalyo
et al. Satisfactory agreements are obtained with a suitable choice of the exchange constants and the anisotropy parameters which are also consistent with those determined from other analyses.
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Toshihiko Shigematsu
1975 年 39 巻 5 号 p.
1233-1238
発行日: 1975/11/15
公開日: 2007/06/01
ジャーナル
認証あり
Mössbauer effect, lattice parameter and thermal expansion measurements were performed in order to obtain the information about the sharp decrease of magnetic moment in (Fe
1−xMn
x)
2B with increasing
x. The internal field at 0 K (H
0) decreases slightly with the increase of
x in the composition range
x≤0.33 at a rate of d
H0⁄d
x∼−135 kOe. When
x becomes larger than 0.33 the slope becomes steeper, d
H0⁄d
x∼−450 kOe. These experimental results were explained well by the assumption that the magnetic moment associated with iron atom becomes 0 μ
B when iron atoms have more than 7 manganese atoms in its near neighbors. The lattice parameter of a-axis at room temperature varies linearly with composition. On the other hand, in c-axis the lattice-parameter-composition curve shows a kink at
x=0.63. No thermal expansion anomaly is observed. This behavior indicates that the magnetic term of lattice parameter remains unchanged even above the Curie temperature.
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Kunihiko Yamaji, Jun Kondo
1975 年 39 巻 5 号 p.
1239-1251
発行日: 1975/11/15
公開日: 2007/06/01
ジャーナル
認証あり
The double-time Green’s function method incorporated with Tyablikov’s decoupling is applied to the nearly two-dimensional ferromagnets of layer-structure copper compounds. Besides the strong intralayer ferromagnetic exchange interaction we take account of weak perturbations, i.e., interlayer exchange interaction, intralayer exchange anisotropy, and dipolar interaction. We obtain the leading two in the inverse transition temperature
Tc−1, i.e., terms logarithmically singular and constant with respect to the weak perturbation. Spin contraction at zero temperature is very small. Outside the very vicinity of zero temperature the equation for spontaneous magnetization σ as a function of
kBT⁄2
J is reduced to a much simpler one containing only one parameter
kBTccalc⁄2
J. Comparison of the calculated
Tc and temperature dependence of σ with experimental deta seems to show the soundness of applying the RPA theory to these systems. The contributions of dipolar interaction are examined.
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Kazuhiro Hara, Hiroshi Fujiwara, Takashi Hashimoto, Kunito Okamoto, Ta ...
1975 年 39 巻 5 号 p.
1252-1256
発行日: 1975/11/15
公開日: 2007/05/29
ジャーナル
認証あり
It has been found from X-ray analysis and electron microscopic observation that two types of crystallites with different crystallographic orientations, [100]-(010) and [111]-(1\bar10), constitute the columnar grain structure in iron film evaporated at an incidence angle of 45°. In these orientations, (010) and (1\bar10) planes are parallel to the incidence plane, and [100] lies along the direction of the vapor beam in the former and [111] tilts from the film normal toward the vapor beam by 10° in the latter orientations. It has also been verified that, irrespective of orientation, the axis of the column tilts from the film normal toward the vapor beam direction by about 35° and the top of the column is surrounded by {110} planes. The magnetic anisotropy concerned with crystallographic orientation of columnar grains is briefly discussed.
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Yutaka Nakai, Nobuhiko Kunitomi
1975 年 39 巻 5 号 p.
1257-1262
発行日: 1975/11/15
公開日: 2007/05/29
ジャーナル
認証あり
It has been obtained by the experiments of diffuse scattering of neutrons that the magnetic moments of Fe and Mn atoms in α-FeMn alloys are 2.23±0.01 and 0.7±0.25μ
B at 0 K, respectively. The magnetic moment of Fe agrees with the theoretical value obtained by CPA calculation, while that of Mn is smaller than the theoretical one. The spatial fluctuation of the magnetic moment of Fe and Mn atoms cannot be observed within the experimental accuracy. The temperature dependence of the magnetic moments of Fe and Mn has been studied, and we have found an anomalous behavior in 〈μ
Mn〉. This behavior cannot be explained by the molecular field theory proposed by Jaccarino
et al.
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Takao Kohara, Kunisuke Asayama
1975 年 39 巻 5 号 p.
1263-1267
発行日: 1975/11/15
公開日: 2007/05/29
ジャーナル
認証あり
NMR studies in antiferromagnetic Cr alloys were performed.
(1) NMR signal of Co
59 in antiferromagnetic
CrCo alloys was observed at about 66 MHz which agrees with the value obtained by Mössbauer experiment. With increasing Co concentration there appeared satellite lines at 45 and 24 MHz due to Co atoms having one and two Co atoms in their nearest neighbours, respectively.
(2) The hyperfine fields at V
51 and Mn
55 were measured in antiferromagnetic
CrVMn ternary system. The result suggests that almost the same order of magnitude of the spin polarization exists at V atoms as well as at Mn atoms. The rigid band approximation does not hold in high concentration range.
(3) V
51 NMR was observed in
CrV alloys in SDW state in external field.
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Hisatake Sano
1975 年 39 巻 5 号 p.
1268-1276
発行日: 1975/11/15
公開日: 2007/06/01
ジャーナル
認証あり
The resistivity of solid beryllium is calculated by a realistic model: The Fermi surface, the Fermi velocities and the wave functions are calculated by the APW method, the phonons are treated by the Bornvon Kármán force-contant model, and the electron-phonon matrix elements are evaluated by means of a modified single-site approximation using the APW crystal potential and the APW functions. The calculated values of the mean resistivity are in good agreement with experimental values over a wide temperature range. The calculated anisotropy ratio ρ
⁄⁄⁄ρ
⊥ is 1.8–1.9, which is much larger than the experimental one (1.1–1.2).
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Osamu Terasaki, Yuji Uchida, Denjiro Watanabe
1975 年 39 巻 5 号 p.
1277-1281
発行日: 1975/11/15
公開日: 2007/05/29
ジャーナル
認証あり
The critical-voltage effect in electron diffraction has been applied to the 400 reflexion of b.c.c. metals, V, Cr, Fe and Nb, and the X-ray atomic scattering factors
fx for the first-order reflexion 200 have been determined from the measured values of critical voltages
Ec by many-beam calculations. The results are compared with X-ray experimental data and theoretical scattering factors for free and solid atoms, and it is shown that the theoretical values for solid atoms calculated,
e. g. by Wakoh and Yamashita agree well wiht the present results for V, Cr and Fe. It is pointed out that the reproducibility of the experimental data given by the present method is superior to that of the X-ray intensity measurements, and that the accurate measurement of scattering factors such as the present study serves as a sensitive and useful test of the band calculation.
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Ikuji Ishida
1975 年 39 巻 5 号 p.
1282-1291
発行日: 1975/11/15
公開日: 2007/06/01
ジャーナル
認証あり
Using the adiabatic potential in the bond charge model, the phonon dispersion relation and the Grüneisen constant are calculated for
Si with the magnitude of the bond charge and its volume change taken as adjustable parameters. It is shown that the Grüneisen constant for the transverse acoustic mode is positive at small wave-numbers and negative at large wave-numbers. This anomalous behavior comes from the positive volume dependence of the bond charge and is the origin of the negative thermal expansion.
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Katsuhiko Takegahara, Tadao Kasuya
1975 年 39 巻 5 号 p.
1292-1300
発行日: 1975/11/15
公開日: 2007/06/01
ジャーナル
認証あり
Based on the unitary transformation, a general treatment of the bound polaron is proposed. In distinction from earlier calculations, the present method gives explicit expressions for not only the energy but also the wave functions both in the ground state and in the excited states such as the relaxed excited state and the phonon scattering state. These expressions involve a summation on the complete set of eigenstates of a trial Hamiltonian, and in actual calculations the Coulomb Hamiltonian and the harmonic oscillator Hamiltonian are chosen as trial Hamiltonians. For the ground state, the energy expression is the same as that obtained by Matsuura with the path integral method. The present method is valid in the whole region of the electron-phonon coupling constant α and Coulomb force β except for β→0 and α>6.
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Akitaka Yasujima, Shin-ichiro Narita
1975 年 39 巻 5 号 p.
1301-1309
発行日: 1975/11/15
公開日: 2007/06/01
ジャーナル
認証あり
Cyclotron resonance experiments for p-Ge and p-Si have been performed in very high magnetic fields at 77 K using 118.6 μm and 27.97 μm radiation from an H
2O laser. The transmission minima in the spectra show considerable shifts toward high magnetic fields comparing to those expected from the calculation by the usual Luttinger treatment. For explaining the results, we employ a correctional Hamiltonian including the effect of the spin-orbit-split-off band. The agreements of the calculated results with the spectral shifts of the resonance fields are satisfactory. In addition, the
kH effect in Si spectra is discussed.
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Kazuhiro Suzuki, Takeshi Kambara, KenIchiro Gondaira, Katsuaki Sato, K ...
1975 年 39 巻 5 号 p.
1310-1315
発行日: 1975/11/15
公開日: 2007/06/01
ジャーナル
認証あり
The optical absorption spectra of CuGaS
2:Co are observed at a room temperature and at 2 K in near infrared and visible regions, the low energy side of the absorption edge (20,000 cm
−1) of the host crystal. The spectra show a broad band in the vicinity of 7,000 cm
−1 and a fine structured band around 13,000 cm
−1.
The fine structure of the upper band is analyzed by calculating the energy level scheme taking account of a low symmetry (
D2d) crystal field and the spin-orbit coupling in addition to the cubic (
Td) field.
A reasonable choice of the parameters reproduces the observed spectra fairly well and give the
g-shifts and zero field splitting constant which agree quite well with the observed values by Kaufmann
et al. (Solid State Commun.
15 (1974) 1881).
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Krishnaji Parmendu Kant, Ramji Srivastava
1975 年 39 巻 5 号 p.
1316-1318
発行日: 1975/11/15
公開日: 2007/05/29
ジャーナル
認証あり
Dielectric behaviour of molybdenum trioxide films as a function of frequency (up to 10 MHz), thickness (from nearly 350 to 5000Å) and temperature (room temperature to nearly 200°C) is reported. The films were prepared by vacuum evaporation technique and their thickness was measured by multiple beam interferometry. Electron diffraction patterns were obtained for material identification. It is observed that the dielectric constant for MoO
3 films is sensitive to frequency and temperature. A dispersion in frequency response is also observed at frequencies between 10 kHz and 100 kHz at room temperature. The relaxation appears to be dipolar in nature. The relaxation time decreases as the thickness of the film increases and finally it tends to stabilize as the structure of the film stabilizes. The stabilization of film structure is also confirmed by the stabilization of low frequency dielectric constant and density of the prepared films. The stabilized value of the static dielectric constant and density of the films reaches the bulk value at about 4000Å thickness. The films show a breakdown strength of 3×10
6 volts/cm.
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Masaki Maeda, Ikuo Suzuki, Ryuji Abe
1975 年 39 巻 5 号 p.
1319-1325
発行日: 1975/11/15
公開日: 2007/06/01
ジャーナル
認証あり
Electron spin resonance experiments of Cr
3+ doped LiNH
4C
4H
4O
6·H
2O (
LAT) single crystals were carried out. Two kinds of Cr
3+ sites were observed. The spin Hamiltonian parameters in its paraelectric phase were determined as
|
D|=38.39×10
−3 cm
−1, |
E|=3.03×10
−3 cm
−1 for
A-site and
|
D|=47.54×10
−3 cm
−1, |
E|=5.96×10
−3 cm
−1 for
B-site
The resonance lines split continuously and smoothly just below the transition temperature. These splitting can be reasonably explained by considering the symmetry change associated with the phase transition and the formation of the domains. Electric field and shear stress
Zx dependence of
ESR lines were measured at a temperature lower than the Curie point, by about 10 K. It was confirmed that the spontaneous polarization can be reversed not only by applying the electric field but also by applying the shear stress
Zx. This indicates that
LAT is both ferroelectric and ferroelastic below the transition temperature.
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Takeo Kondo, Yoshihiro Ishibashi, Yutaka Takagi
1975 年 39 巻 5 号 p.
1326-1333
発行日: 1975/11/15
公開日: 2007/06/01
ジャーナル
認証あり
It was experimentally confirmed by observations of stress-strain hysteresis loop that the room temperature paraelectric phase of NH
4HSO
4 is ferroelastic. This observation undoubtedly suggests the existence of the prototypic crystal structure from which the paraelectric-ferroelastic phase is derived by the phase transition. By adopting the Pnma phase as a prototype the phase transitions to the room temperature B2
1/a and then to the ferroelectric Ba phase are group-theoretically analysed. The results are in satisfactory agreement with observations.
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Tetsuo Nagata
1975 年 39 巻 5 号 p.
1334-1341
発行日: 1975/11/15
公開日: 2007/06/01
ジャーナル
認証あり
Mechanism for negative ion formation of hydrogen and helium by electron capture of H
+ and He
+ in the passage through potassium vapor has been studied. A 60° sector mass spectrometer equipped with two potassium cells arranged along the beam axis is used. The translational energy analysis by the magnetic field of the formed negative ions has been made. The main processes of the H
− and He
− formation are double-collision processes
via H(1s) and He(2
3S), respectively, confirming the description by Donnally
et al. It is suggested that H
− ions in the (2p
2)
3P state are formed by single-collision process. In the case of K target, H
− ions formed from H(2s) are negligible compared with those from H(1s). The metastable fraction of neutral H beams produced by passage of H
+ beams through thin K vapor is found to be 0.27±0.02 at 3 keV.
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Kenichi Nanbu
1975 年 39 巻 5 号 p.
1342-1345
発行日: 1975/11/15
公開日: 2007/06/01
ジャーナル
認証あり
To explain an increase of the vibration-translation (V–T) relaxation rate in an expansion flow experiment, the vibrational relaxation of a system of anharmonic Morse oscillators in an isothermal heat bath is studied through an examination of the relaxation manner of the vibration-vibration quasi-steady distribution. It is concluded that an increase of the V–T rate less than a factor of about 2 can be explained as resulting from effects of anharmonicity.
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Hideki Miyaji
1975 年 39 巻 5 号 p.
1346-1350
発行日: 1975/11/15
公開日: 2007/06/01
ジャーナル
認証あり
A single crystal mat of polyoxymethylene (POM) is compressed hydrostatically up to 20 kbar at 25°C. The lattice constants of trigonal form of POM are measured and found to vary reversibly with pressure;
a-axis is decreased by about 5.5% and
c-axis, 0.3% at 20kbar. Equation of state of the trigonal form of POM is calculated under the approximation of a two-dimensional lattice; intra-chain configuration is assumed to be unchanged. The agreement between the calculation and the experiment is found to be good for two possible space groups, P3
121 and P3
112. The transformation from the trigonal to the orthorhombic form is discussed. Four elastic compliances,
s11,
s12,
s13 and
s33 are also obtained.
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Kohnosuke Sato, Tadashi Sekiguchi
1975 年 39 巻 5 号 p.
1351-1357
発行日: 1975/11/15
公開日: 2007/06/01
ジャーナル
認証あり
Basic characteristics of CO
2 gas-dynamic laser (GDL) are investigated theoretically. A simplified theoretical model of vibrational relaxation processes is proposed. The population inversion and the small signal gain of the CO
2 GDL are calculated by using this model. The results are compared with the previous experimental results (J. Phys. Soc. Japan
36 (1974) 880). It is confirmed that the vibrational relaxation processes in the CO
2 GDL may be considered as the combination of the relaxation processes in a constant-temperature condition and the gasdynamic cooling processes in a supersonic nozzle flow. In addition, it is found that the Schwartz-Slawsky-Herzfeld (SSH) theory on the temperature dependence of vibrational relaxation times is approximately valid even in a low temperature region below 300 K. It is also suggested that the values of vibrational relaxation time under the condition of rapid cooling are much shorter (by a factor of 10 to 100) than those in heating phase.
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Takasi Tuda
1975 年 39 巻 5 号 p.
1358-1364
発行日: 1975/11/15
公開日: 2007/06/01
ジャーナル
認証あり
A relaxation mechanism for the externally excited radial electric field in a tokamak plasma is investigated in the “banana” regime. It is shown that the damping time scale is of the order δ
3⁄2⁄ν
iiq2, where δ is the inverse aspect ratio, ν
ii the ion-ion collision frequency,
q the safety factor. The plasma in a tokamak is found to have a large effective dielectric constant by a factor
q2⁄δ
2.
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Tatsuki Ogino, Susumu Takeda
1975 年 39 巻 5 号 p.
1365-1372
発行日: 1975/11/15
公開日: 2007/06/01
ジャーナル
認証あり
The temporal behaviors of the finite amplitude ion-acoustic waves propagating in both directions are simulated by a fluid model. In the simulation, several ion-acoustic solitons propagating in both directions emerge and nonlinearly interact one another at the collisions. At the head-on collision, the combined amplitudes of the density and velocity differ from the simple sum of the amplitude of the two solitons. Moreover, the phase shifts cannot be predicted from the Boussinesq equation but agree with those by a reductive perturbation method. The system including the solitons propagating in both directions becomes a turbulent state more quickly than that including only the solitons propagating in unidirection.
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Setsuo Ichimaru
1975 年 39 巻 5 号 p.
1373-1378
発行日: 1975/11/15
公開日: 2007/06/01
ジャーナル
認証あり
The heating rate of the particles of a given species under the influence of fluctuating electric fields in a plasma is calculated explicitly in terms of those physical parameters relevant to specification of the system: These are the average drift velocity and the velocity spread around it for the particles; the integrated strength, the peak frequency and the spectral width around it for the fluctuation spectrum. The effects arising from the correlation times of the fluctuations are elucidated through investigation of various limiting cases.
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Takuji Kawahara, Nobumasa Sugimoto, Tsunehiko Kakutani
1975 年 39 巻 5 号 p.
1379-1386
発行日: 1975/11/15
公開日: 2007/06/01
ジャーナル
認証あり
Coupled nonlinear partial differential equations, which describe a nonlinear interaction between short and long capillary-gravity waves on a liquid layer of uniform depth, are derived by the derivative expansion method. The short and the long waves can exchange energy in a resonant manner, if the group velocity of the short wave is close to the phase velocity of the long wave. It is found that the long wave can take a form of rarefactive (convex downwards) solitary wave due to the resonant interaction. This should be compared with the well-known gravity wave soliton which is compressive (convex upwards) in the absence of the short wave.
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Shigeki Morioka, Magane Tanaka
1975 年 39 巻 5 号 p.
1387-1394
発行日: 1975/11/15
公開日: 2007/06/01
ジャーナル
認証あり
The steady, plane flow of ideal gas of low electrical conductivity with uniform magnetic field past a symmetrical airfoil is considered on the basis of the linearized theory. The magnetic Reynolds number and the Alfvén Mach number are assumed to be infinitesimal but the interaction parameter
N and the angle θ between the magnetic field and the main stream may be arbitrary, as well as the Mach number not so close to unity. The exact expressions of the velocity and pressure distributions on the airfoil are presented, and it is shown that no lift but the local flow slip behind the trailing edge appears when the flow is non-aligned. The simple asymptotic expressions are presented for large
N and small θ. The critical behaviour of the flow field adjacent to the airfoil and the corresponding change of the drag force are discussed thereby. The critical change occurs in the vicinity of the factor
N1⁄2sinθ∼1.
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Shigeo Kida
1975 年 39 巻 5 号 p.
1395-1404
発行日: 1975/11/15
公開日: 2007/06/01
ジャーナル
認証あり
The statistics of the system composed of a large number of line vortices is studied as a model of two-dimensional turbulence at extremely large Reynolds numbers. The state of the vortex system is expressed as a point in the phase space composed of the (
x,
y) coordinates of the vortices. A spatial distribution of vortices corresponds to a finite volume in the phase space. The distribution which has the maximum volume in the phase space is identified with the most probable one. The axisymmetric distributions are calculated for various values of the constants of motion of the system. Numerical experiments using some hundreds of vortices are carried out and it is found that the distributions obtained by the numerical experiments are in good agreement with the most probable distributions.
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William Frith Harris
1975 年 39 巻 5 号 p.
1405
発行日: 1975/11/15
公開日: 2007/06/01
ジャーナル
認証あり
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Shigeru Kubono, Seigo Kato, Masaharu Yasue, Katsuji Koyama, Hajime Ohn ...
1975 年 39 巻 5 号 p.
1407-1408
発行日: 1975/11/15
公開日: 2007/05/29
ジャーナル
認証あり
Angular distribution for the
16O(
p,
t)
14O
* (6.27 MeV) reaction obtained at
Ep=52 MeV has confirmed a previous observation that it cannot be fitted by
L=3 DWBA. An explanation in terms of coupled-channel Born approximation is presented.
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Juichiro Arai
1975 年 39 巻 5 号 p.
1409-1410
発行日: 1975/11/15
公開日: 2007/05/29
ジャーナル
認証あり
In order to investigate the effect of magnetic inhomogeneity on the Invar anomaly in Fe–Ni alloy, Mössbauer effect was measured using the specimens with various degrees of inhomogeneity introduced by heating a foil of 30.3% Ni–Fe electroplated with nickel, at 1000°C for various periods of time. Distribution of the internal magnetic field was determined by computer fitting. It has been found out therefrom that internal field has an anomalously wide distribution in the specimen which exhibits negative or zero thermal expansion in a wide temperature range.
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Noriaki Kazama, Hiroshi Watanabe
1975 年 39 巻 5 号 p.
1411-1412
発行日: 1975/11/15
公開日: 2007/06/01
ジャーナル
認証あり
Magnetic phase transition of amorphous ferromagnets Fe–P–C and Co(Fe)–Si–B has been investigated by means of a neutron depolarization method.
The Curie temperature at H=0 is determined with accuracy for the amorphous Fe–P–C alloy which includes only one magnetic atom. It turns out that the measured data for Fe–P–C alloy obey the power laws (i)
Bs2δ≅|(
Tc−
T)⁄
Tc|
2β with β=0.36±0.02 below
Tc, (ii)
Bs2δ≅|(
T−
Tc)⁄
Tc|
ν with ν=0.55±0.05 above
Tc, if simplified assumptions are used about ferromagnetic domain structures.
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Kunihiko Morimoto
1975 年 39 巻 5 号 p.
1413-1414
発行日: 1975/11/15
公開日: 2007/06/01
ジャーナル
認証あり
Temperature dependence of
T1,
T1ρ and
TD1 of protons have been measured in pentamethylbenzene between 300 K and 8 K. The anomalous behavior of
T1 and
T1ρ between 80 K and 40 K can be understood as the effect of the tunneling motion of methyl-groups. By using a simple model of relaxation and the data of
T1ρ, the tunneling splitting of methyl-group was estimated to be about 500 kHz.
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Akira Nakanishi, Takeo Matsubara
1975 年 39 巻 5 号 p.
1415-1416
発行日: 1975/11/15
公開日: 2007/06/01
ジャーナル
認証あり
On the basis of a self-consistent Einstein model, a theoretical treatment for the anharmonic lattice vibration of metallic fine particles is presented and the size dependence of the melting temperature is discussed. The melting phenomenon is related to an instability of the lattice. A model calculation gives good results in accord with experiment.
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