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Tomiei Hori, Yasuaki Nakagawa, Junji Sakurai
1968 Volume 24 Issue 5 Pages
971-976
Published: May 05, 1968
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The β
1 phase of the CsCl-type structure in Mn–Zn system, which exhibits strong ferromagnetism at room temperature, was found to be stable below 175°C. Its homogeneity range extends from 50 to 56.5 at.% Mn. A canted spin structure,
i. e. a coexistence of ferromagnetic and antiferromagnetic moments which are orthogonal to each other, was revealed to exist by the technique of neutron diffraction. Both moments decrease with increasing Mn content. An attempt to substitute a third element for Zn or Mn was unsuccessful except for Ga. The β
1 phase can contain as much as 10% Ga. The substitution of Ga for Zn gives rise to an increase in ferromagnetic moment and a decrease in antiferromagnetic moment.
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G. Chaddha
1968 Volume 24 Issue 5 Pages
976-979
Published: May 05, 1968
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An electron paramagnetic resonance investigation of Cu
2+-doped (NH
4)
2SO
4 single crystals has been made at room temperature. The spectra corresponding to the complex (Cu
2+ ion associated with a (NH
4)
+ vacancy) making an angle of 20° with the crystalline
b-axis in
b–
c plane, are observed and are analysed in terms of the parameters of the spin-Hamiltonian. From the obtained experimental data, the ground state wave function of the Cu
2+ ion has been constructed. Then the value of δ
g=
gy−
gx has been calculated and compared with the measured value.
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Noriaki Kazama, Tokutaro Hirone, Kazuo Kamigaki, Takejiro Kaneko
1968 Volume 24 Issue 5 Pages
980-983
Published: May 05, 1968
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The magnetostriction of an antiferromagnet Au
2Mn of the screw type spin arrangement was measured up to a magnetic field intensity of 80 kOe in the temperature range from room temperature to the liquid He point. Both the longitudinal and transverse magnetostriction curves consist in series of (1) a fairly complicated part in a low magnetic field range, (2) a contraction of the order of 200×10
−6, and (3) a weak contraction proportional to the intensity of the magnetic field in a high field range. At temperatures above 200°K, slight expansion can be seen between the stages (2) and (3) in the case of the longitudinal effect. The observed magnetostrictions can be considered to be caused by (1) the rotation of the magnetic moment in the
c-plane, (2) the rotation of the magnetic moment toward the
c-axis, and (3) the change in screw angle during the course of magnetization.
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Tohru Morita
1968 Volume 24 Issue 5 Pages
984-987
Published: May 05, 1968
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It is shown that the spin pair correlation function of an Ising ferromagnet is calculated from the knowledge of the shift of the magnetization under a presence of an infinitesimal non-uniform field. For the calculation, use is made of the constant coupling approximation, which has been formulated in a form which is applicable to a non-uniform case, by Oguchi and Ono and independently by Morita and Tanaka. The obtained spin pair correlation function for spin 1/2 Ising model is found to be identical to the one which has been obtained by Elliott and Marshall with the aid of the Be the approximation and slightly different from Oguchi and Ono’s result. The obtained spin pair correlation function of the nearest neighbor spins is argued to be in a better approximation than is calculated by the usual constant coupling approximation. The result obtained for a ferromagnet is used to obtain the corresponding result for an Ising antiferromagnet. The formulas are given in a form which is applicable to an arbitrary spin.
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Hans Wawra
1968 Volume 24 Issue 5 Pages
988-991
Published: May 05, 1968
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Young’s modulus was used as an indication of the changes of texture and stacking fault energy. For alpha-brasses a maximum was found around 1% zinc (γ≈101 ergs/cm
2). The change of the stacking fault energy for alpha-brasses is comparable with the characteristic of the concentration-dependence of the stacking fault energy in the system Cu–Ge and Cu–Ga. The results found by English and Chin (both high and low stacking fault energy results in sharp 〈111〉-textures) as a contrary to the theory of Brown was discussed.
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Yoshio Muto, Koshichi Noto, Takayoshi Mamiya, Tadao Fukuroi
1968 Volume 24 Issue 5 Pages
992-995
Published: May 05, 1968
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From the standpoint of the Caroli and Cyrot theory, the thermal conductivity near the upper critical field of indium lead alloys is investigated. The agreement between the experiment and the theory is found sufficient for every specimen at all temperatures under study.
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Toru Miyakawa, Seiichi Oyama
1968 Volume 24 Issue 5 Pages
996-1007
Published: May 05, 1968
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The electronic structure of exciton in KCl is analyzed using the valence band structure and wave function of Howland and the effective mass and the wave function of the conduction band calculated by the authors. The effective mass formalism gives 1.1 and 0.28 eV for the binding energies of 1
s- and 2
s-excitons, respectively. The effect of valence band warping is found to make the
J=2 states to interact with the
J=1 states and thus to reduce the spin-orbit splitting. This effect is small in the case of
Γ1-exciton in KCl because of small effective mass of the conduction electron. Short range electron-hole exchange interaction estimated from the band wave functions gives a reasonable ratio of intensities of higher and lower energy components for both
n=1 and
n=2 halogen doublets. Also calculated spin-orbit splittings for
n=1 and
n=2 states are in good agreement with experiment. The total oscillator strength of this doublet is found to be 0.15.
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Yasuhiro Miyoshi, Nobuhiko Saitô
1968 Volume 24 Issue 5 Pages
1007-1019
Published: May 05, 1968
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The d.c. electrical conductivity of poly-γ-benzyl-
L-glutamate (PBLG), nylon 66 and calf thymus DNA has been investigated experimentally as the examples of hydrogen-bonded polymers. Energy gaps which are assumed to be the twice of the activation energy are determined by the temperature variation of conductance in the solid dry state; 2.07±0.05 eV for PBLG in α-helix, 2.00±0.05 eV for helical DNA, 4.92±0.05 eV and 1.85±0.05 eV respectively for higher and lower temperature regions of nylon 66 in α-form. The adsorption of polar or nonpolar molecules (H
2O, CH
3OH, C
6H
6) has the effect of increasing the conductivity and decreasing the activation energy of conduction. These results are in disagreement with the values expected from recent theoretical investigations and spectroscopic studies of these samples. Possible conduction mechanisms for these polymers are proposed in the case of solid dry state as well as of the state adsorbing polar or nonpolar molecules.
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Tsuyoshi Yoshi-yama, Michi-hiko Mannami, Kenzo Tanaka
1968 Volume 24 Issue 5 Pages
1019-1026
Published: May 05, 1968
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The dependence of the electric charge of the edge dislocations in sodium chloride on impurity atoms was investigated at room temperature. It was found that the edge dislocations are negatively charged when the crystal contains positive divalent impurities (Mg
++, Ca
++) and are positively charged when the crystal contains negative divalent impurity (S
−−).
Measurements have been done on the decay of the electric potential on the surfaces of the crystal when the crystal is suffering a cyclic plastic bending of 120 c/s of a finite amplitude. The electric potential on the surfaces decays through two stages and the decay depends on the kind and the concentration of the divalent impurity atoms contained in the crystal. This decay aspect was discussed in terms of the dislocation multiplication and the decrease of the electric charge of the dislocations during the cyclic plastic deformation.
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Masuo Nakagawa
1968 Volume 24 Issue 5 Pages
1027-1034
Published: May 05, 1968
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Color centers are introduced into MgO single crystals by reactor neutron irradiations. The energy separations obtained from several sharp peaks appeared on longer wavelength tail of 352 and 980 nm bands are in good agreement with characteristic phonon energies calculated by Karo and Hardy. The identifications of both 352 and 980 nm bands are considered: It is suggested to assign the 352 nm band to the Cr ion centers associated with a certain vacancies or defects and the 980 nm band to the
M′ centers.
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Hitosi Yasunaga
1968 Volume 24 Issue 5 Pages
1035-1042
Published: May 05, 1968
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The photoconductivity and the Hall mobility of photo-electrons in pure SrTiO
3 single crystals have been measured over the temperature range from 10 to 230°K. The measurements have used the conventional dc method and continuous illumination, but have suffered from no effect of space charge owing to the large dielectric constant of SrTiO
3. A large anomaly in the photoconductivity temperature dependence has been observed around 47°K. At corresponding temperatures the Hall mobility exhibits a slight anomaly. These anomalies are due to a ferroelectric transition of a small fraction of sample around 47°K. The Hall mobility μ
H exhibits a power-law temperature dependence of the form μ
H=1.25×10
8T−3 cm
2/volt·sec over the temperature range from 30 to 230°K and is proportional to
T−3⁄2 below 30°K, where
T is the absolute temperature. These temperature dependences can be explained in terms of the mixed scattering by the intra-valley acoustical modes and the inter-valley optical modes.
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Ichiro Hatta
1968 Volume 24 Issue 5 Pages
1043-1053
Published: May 05, 1968
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The complex dielectric constant of NaNO
2 crystal was measured in a frequency range between 1 MHz and 24 GHz from room temperature to 210°C. The measuring methods in the various frequency ranges were described in detail and especially the measuring accuracies in the complex dielectric constant and the temperature were considered closely. It was found that a dielectric dispersion occurs in the ferroelectric
b direction and this dispersion obeys nearly the formula of the Debye-type with a single relaxation time above the transition point. The relaxation frequency is proportional to (
T−
T0) near the transition point, where
T is the temperature and
T0 is about 162°C, and deviates from this linear relationship above
ca 180°C, bending upward. In the
a and
c directions, any remarkable change in the dielectric constant was not observed up to 24 GHz.
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Yasusada Yamada, Yasuhiko Fujii, Ichiro Hatta
1968 Volume 24 Issue 5 Pages
1053-1058
Published: May 05, 1968
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The dielectric relaxation in NaNO
2 is analyzed on the basis of the time dependent statistics of the Ising system, where the Ising variable corresponds to two stable orientations of the polarization carried by each molecular unit. The dynamical susceptibility is calculated with the random phase approximation in terms of the potential barrier
ΔU between two stable orientations. The observed temperature and frequency dependences of the complex dielectric constants above the antiferroelectric transition temperature
TN are explained reasonably well by taking
ΔU as
ΔU≅7.4
kTN. The relaxation time of the flipping motion of each NO
2− ion at high temperatures where the correlation between molecules is negligible is of the order of 10
−11 sec. The observed slow relaxation near the transition temperature is accounted for as due to the thermodynamical slowing down process of the correlated fluctuation of polarization. The monodispersive character is discussed in terms of the long range nature of interdipolar interaction and the antiferroelectricity.
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Masamitsu Hirai, Kunio Hashizume
1968 Volume 24 Issue 5 Pages
1059-1074
Published: May 05, 1968
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The
M-center luminescence in KCl and KBr crystals has been investigated extensively over a temperature range from about 4°K to 370°K. From the temperature dependence of the band width of the luminescence, vibrational frequencies influencing the
M center in the excited states are estimated as 3.9×10
12 cps and 3.8×10
12 cps, respectively, in KCl and KBr crystals. By stimulating the crystal with
M4 light almost the same luminescence as that by
M1 light is observed in KCl. New absorption bands,
ML, being associated with the
M center and located at 360 mμ, 308 mμ, 250 mμ, and 400 mμ, 325 mμ, 275 mμ in KCl and KBr crystals, respectively, have been found, which may be analogous to the
L bands of the
F center. By comparing with the quantum yield of the
F-center luminescence, the quantum yield of the
M-center luminescence is estimated as 0.37±0.05 in KCl crystals at liquid nitrogen temperature. From the temperature dependence of the
M-center luminescence intensity the energy gap between the first excited state and the bottom of the conduction band is found to be 0.38±0.01 eV and 0.13±0.02 eV in KCl and KBr crystals, respectively.
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Yoichi Uchida, Taiju Tsuboi
1968 Volume 24 Issue 5 Pages
1075-1082
Published: May 05, 1968
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Absorption, excitation, and emission spectra of KI–Tl crystals have been investigated over the temperature range from 10°K to 300°K. The C band has a temperature sensitive triplet structure and the A band has a temperature sensitive asymmetry. The absorption intensities of the paired thallous ion bands are independent of temperature. Excitation in any band of the paired thallous ion center produces the same single 412 mμ emission band at 10°K. The luminescent processes in the paired thallous ion center are discussed basing on the model of the pseudomolecule composed of two thallous ions. Moreover, the experimental results on the paired thallous ion center in KI–Tl crystals are compared with the previous results on the center in NaI–Tl crystals.
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Akio Honma
1968 Volume 24 Issue 5 Pages
1082-1095
Published: May 05, 1968
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An attempt to reformulate and extend the method given by HSS (C. H. Henry, S. E. Schnattely, and C. P. Slichter: Phys. Rev.
137 (1965) A583) is made. The unperturbed electronic Hamiltonian
H0 responsible for the absorption lines is chosen only under the condition that its solution has many degenerate levels. Using the perturbation theory, the moments are calculated up to the third order in the perturbing Hamiltonian
H1, in contrast to the first order in the HSS’s theory. Since the spin-orbit interaction
HSO may be contained in
H0 or
H1, the obtained formulae of moments are applicable to many kinds of systems, although the HSS’s treatment is restricted to the systems in which
HSO is regarded as the perturbation. The results are applied to the absorption bands of the alkali halide phosphors containing heavy-metal ions with (
s)
2 configuration, and the method to determine the values of energy parameters for these ions is discussed.
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Hiroshi Saito, Setsuko Saito, Ryumyo Onaka, Bunji Ikeo
1968 Volume 24 Issue 5 Pages
1095-1098
Published: May 05, 1968
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Absorption spectra of thin films of twelve alkali halides are studied in the XUV region. Doublet or triplet bands which depend little on the kind of halogen are found in K-, Rb- and Cs halides, and are interpreted as exciton bands related with intraionic transitions in the alkali ions.
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Kazuhiko Yoshida, Yoshihiko Gotoh, Mikio Yamamoto
1968 Volume 24 Issue 5 Pages
1099-1107
Published: May 05, 1968
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Stress-strain curves of 150 copper whiskers, whose thickness ranges from 4 to 30μ and growth orientations are parallel to the three principal crystallographic orientations, have been investigated by an Instron-type tensile machine at room temperature. Thinner whiskers have shown characteristic sharp yield points. The upper yield stress of some thinner whiskers reaches nearly the theoretical strength of an ideal perfect crystal, but it decreases as the thickness increases. In the subsequent “easy glide” region, corresponding to the propagation of one or a few Lüders bands, pronounced serrations appear, and both of flow stress and Lüders strain vary approximately in inverse proportion to the thickness. The hardening rate in the most rapid hardening stage of the stress-strain curve increases with increasing thickness. In whiskers, thicker, than about 20μ, the sharp yield point and serrated “easy glide” region are scarcely observable, and their Stress-strain curves are similar to those of bulk crystals.
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Kazutoshi Ohashi, Mitsuru Awano
1968 Volume 24 Issue 5 Pages
1107-1115
Published: May 05, 1968
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The scattering of lattice waves by a line defect in a simple cubic lattice is investigated by means of Green’s function method. This line defect consists of a line of substitutional impurity atoms. When a perturbation due to the line defect is small, the scattering of lattice waves follows the Rayleigh law and its cross section is nearly equal to Klemens’ result. But, as the perturbation is increased, an elastic resonance scattering occurs. The effect of the resonance scattering on the total scattering cross section is calculated numerically for a line of isotopic impurity atoms and for a line of holes. A strong resonance does not occur for these line defects.
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Y. H. Ohtsuki
1968 Volume 24 Issue 5 Pages
1116-1124
Published: May 05, 1968
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In the strong absorption limit, the one-dimensional second-order differential equation is obtained for the wave field in the low energy electron diffraction. The solution of the differential equation is given approximately and the “resonance condition,” “ordinary Bragg peaks” and “secondary Bragg peaks” are discussed.
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Keiichi Imakubo
1968 Volume 24 Issue 5 Pages
1124-1132
Published: May 05, 1968
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The ultraviolet rays-induced excited states and energy transfer in dinucleotides at 77°K have been studied by luminescence measurements. From the investigation of concentration dependence, the anomalous fluorescence of several stacked dinucleotides can be regarded as the intramolecular excimer fluorescence. In addition, the dinucleotides CpA(cytidylyl(3′–5′)adenosine), UpA(uridylyl(3′–5′)adenosine), ApG(adenylyl(3′–5′)guanosine), and GpA(guanylyl(3′–5′)adenosine) show the normal fluorescence of A(adenosine) in CpA and UpA or G(guanosine) in ApG and GpA as well as the excimer fluorescence. However, the fluorescence of GpC(guanylyl(3′–5′)cytidine) and CpG(cytidylyl(3′–5′)guanosine) is the sum of independent fluorescence of G and C(cytidine). On the other hand, the phosphorescence of dinucleotides containing A and C, U(uridine), or G is always characteristic of A while that of GpC and CpG is identical to G. In all the dinucleotides containing A, the energy transfer takes place via the excimer state from C, U, or G to the triplet state of A. In the case of CpA, UpA, ApG, and GpA, a part of energy is converted to the normal fluorescence of A in CpA and UpA or G in ApG and GpA. Therefore, it is assumed that in above four dinucleotides the excimer fluorescence process can compete with normal fluorescence one. In the case of GpC and CpG, the intramolecular triplet-triplet transfer occurs from C to G.
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Hisamoto Furuse
1968 Volume 24 Issue 5 Pages
1133-1136
Published: May 05, 1968
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The viscosity of a fluid containing small particles covered with another fluid and Stokes’ resistance of the particle have been calculated. It has been shown that, as the ratio (
b⁄
a) of radius of drop (
a) and inner particle (
b) tends to 1, the present results reduce to Einstein’s viscosity formula or Stokes’ resistance formula, on the other hand, as the ratio tends to 0, these reduce to Taylor’s or Hadamard’s results in the case of drops.
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Kanefusa Gotoh
1968 Volume 24 Issue 5 Pages
1137-1146
Published: May 05, 1968
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The equilibrium state of periodic, quasi-neutral disturbance with finite amplitude in free flows is investigated for large values of the Reynolds number
R.
The equilibrium amplitude of the disturbance is obtained as, for
ci<
R−1⁄3,
|
A|=
K1ci1⁄2R−1⁄6(1+
K2Rci)
−1⁄2,
and for
ci>
R−1⁄3,
|
A|=
K3ci2,
where
K1,
K2 and
K3 are numerical constants depending upon the form of the velocity distribution of the basic flow, and
c1 the amplification factor due to the linear theory.
In the sub-critical state, the flow is stable even for the disturbance of finite amplitude.
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Yuji Tanaka, Masamoto Otsuka
1968 Volume 24 Issue 5 Pages
1146-1152
Published: May 05, 1968
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Experimental results on oscillations in the plasma of the TP-D machine are described. The plasma is produced with a modified Duoplasmatron and diffused out along the magnetic line of force. With stronger magnetic field a “left-handed” rotation of the plasma column appears in its outer region, where an electron oscillation is excited and this causes an anomalous increase in the diffusion coefficient of electrons. Also the high frequency component of the electron oscillation is excited by the electron beam with a large spread in the beam velocity.
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Kyoji Nishikawa
1968 Volume 24 Issue 5 Pages
1152-1158
Published: May 05, 1968
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The general theory of the parametric excitation of coupled waves developed in the preceding paper is applied to the parametric interaction of the electrostatic waves in a plasma with radiation whose frequency is close to the electron plasma frequency. On the basis of the hydrodynamic equations, the coupled equations for the electron plasma wave and ion acoustic wave are derived. The effect of the Landau damping is also considered phenomenologically. Using the coupled wave equations, the expressions for the threshold radiation intensity, the frequency shift at the threshold and the growth rate above threshold are obtained. In particular, the dependence of these quantities on the wave-length of the electrostatic waves is discussed in detail. The results are compared with experiment of Stern and Tzoar.
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Tsunehiko Kakutani, Hiroaki Ono, Tosiya Taniuti, Chau-Chin Wei
1968 Volume 24 Issue 5 Pages
1159-1166
Published: May 05, 1968
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The Reductive Perturbation Method established in a previous paper is applied to the analysis of hydromagnetic wave of small but finite amplitude propagating in a cold plasma. It is shown that the basic system of equations belongs to the exceptional case defined in that paper and in the lowest order of perturbation it can be reduced to the Kortweg-de Vries equation for all angles of propagation.
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Kohsuke Yagi, Yoshio Saji, Toshiyuki Ishimatsu, Yoshihide Ishizaki, Ma ...
1968 Volume 24 Issue 5 Pages
1167
Published: May 05, 1968
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Takashi Sambongi, Tadayasu Mitsui
1968 Volume 24 Issue 5 Pages
1168
Published: May 05, 1968
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Hanako Kobayashi, Ikuji Tsujikawa, Izuru Kimura
1968 Volume 24 Issue 5 Pages
1169-1170
Published: May 05, 1968
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Tadashi Mizoguchi
1968 Volume 24 Issue 5 Pages
1170
Published: May 05, 1968
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Hisao Katsuraki, Shizuka Yoshii
1968 Volume 24 Issue 5 Pages
1171-1172
Published: May 05, 1968
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Kunisuke Asayama, Shinji Wada, Yasukage Oda
1968 Volume 24 Issue 5 Pages
1172
Published: May 05, 1968
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Kohji Ohbayashi, Yasunori Tominaga, Shuichi Iida
1968 Volume 24 Issue 5 Pages
1173-1174
Published: May 05, 1968
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Mitsuo Ida, Teruyuki Nishimura
1968 Volume 24 Issue 5 Pages
1174
Published: May 05, 1968
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A. Nakajima, H. Nishiguchi, Y. Deguchi
1968 Volume 24 Issue 5 Pages
1175-1176
Published: May 05, 1968
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Shuichi Otake, Shigetoshi Koike
1968 Volume 24 Issue 5 Pages
1176
Published: May 05, 1968
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Shohei Wakita, Masamitsu Hirai
1968 Volume 24 Issue 5 Pages
1177
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Eiichi Adachi
1968 Volume 24 Issue 5 Pages
1178
Published: May 05, 1968
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Takenori Okubo, Noriaki Itoh, Tokuo Suita
1968 Volume 24 Issue 5 Pages
1179
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Koh Era, Hirohiko Katayama, Shigeo Shionoya
1968 Volume 24 Issue 5 Pages
1180-1181
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Arisato Ejiri
1968 Volume 24 Issue 5 Pages
1181
Published: May 05, 1968
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Shigehiro Miyamoto, Shigeru Kawashima, Shigeo Shionoya
1968 Volume 24 Issue 5 Pages
1182
Published: May 05, 1968
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Masaaki Tamatani, Toshiro Ban, Ikuji Tsujikawa
1968 Volume 24 Issue 5 Pages
1183
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Hiroshi Kanzaki, Shiro Sakuragi
1968 Volume 24 Issue 5 Pages
1184
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Tadao Shimizu, Koichi Shimoda, Arimichi Minoh
1968 Volume 24 Issue 5 Pages
1185
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Kiyoshi Yatsui, Tohru Kobayashi, Yoshio Inuishi
1968 Volume 24 Issue 5 Pages
1186-1187
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Yoshihiro Ohmura
1968 Volume 24 Issue 5 Pages
1187
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Yukio Osaka, Syozo Imai, Yosihisa Takeuti
1968 Volume 24 Issue 5 Pages
1188
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