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Tadao Nozaki
1970 Volume 29 Issue 6 Pages
1403-1427
Published: December 05, 1970
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An 80 TeV nuclear interaction of type (15+15+49)
p detected in a large emulsion stack was analysed in detail. The target diagram of charged secondary particles and γ-rays in the extreme forward cone together with their energy estimates was found to be consistent with the production of an Aleph baryon and its subsequent decay into (
p+φ) in the extreme forward cone. The masses of the wide angle secondary charged particles Were identified and the results were found to be consistent with the production of an Aleph baryon decaying into (
p+φ) in the extreme backward cone of the center of mass system.
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Hiroyuki Shibata, Tatsunosuke Kaneko, Syunsuke Kishimoto
1970 Volume 29 Issue 6 Pages
1427-1435
Published: December 05, 1970
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The observation of muon bundles caused by cosmic rays was carried out for 17,000 hours by means of spark chamber at 30 m.w.e. below ground. The muon bundles in a narrow region of 20∼30 cm in diameter were observed over the expectation from the fluctuation of spatial distribution or muons by the Monte Carlo method. Their frequency was about 2×10
−4 m
−2 h
−1. The frequency of these muon bundles cannot be explained as known interaction processes without extreme assumptions.
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Susumu Ohya, Tsutomu Tamura, Seizaburo Kageyama
1970 Volume 29 Issue 6 Pages
1435-1445
Published: December 05, 1970
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The radiations emitted in the decay of
129Sb have been investigated with application of Ge(Li), Si(Li) and Nal detectors. From various coincidence studies on these transitions, it is concluded that excited levels are populated at 105.5, 180.8, 464.9, 544.7, 634.0, 760.1, 812.8, 966.6, 1228.3, 1281.3, 1317.5, 1599.0, 1633.0, 1654.6, 1727.0, 1736.5, 1752.6, 1842.8, 1870.3, 2070.1, 2085.3, 2113.0 and 2133.2 keV.
The spin-parity values are tentatively assigned for low-lying levels. The results are compared with other odd-mass tellurium nuclei.
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Masaru Yasui, Eisuke Hayashi, Masao Shimizu
1970 Volume 29 Issue 6 Pages
1446-1455
Published: December 05, 1970
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Self-consistent band calculations are carried out for vanadium and chromium. The modified tight-binding method and the orthogonalized-plane-wave method are made use of for the wave functions of
d- and
s-electrons, respectively. The crystal potential and wave function are determined self-consistently by an iteration method. The calculations are carried out in the two cases where the coefficient of the Slater exchange potential is 1 and 0.725. The band structures, Fermi surfaces, and density of states curves are obtained for both metals and compared with previously reported results.
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Toshimitsu Musha
1970 Volume 29 Issue 6 Pages
1456-1464
Published: December 05, 1970
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High frequency electrical conductivity is calculated in the presence of a static electric and magnetic fields both parallel to the rf electric field. Displaced Maxwellian distribution is assumed. It has been found that the rf conductivity becomes negative when the drift velocity exceeds 0.85 times the thermal velocity if polar optical phonon scattering is taken into account and that 0.65 times the thermal velocity if screened Coulomb scattering is taken into account. Furthermore fluctuation of the electron distribution is computed in the velocity space.
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Ko Sugihara
1970 Volume 29 Issue 6 Pages
1465-1470
Published: December 05, 1970
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According to Takezawa
et al., the thermoelectric power (
Remark: Graphics omitted.) along the basal plane in a synthetic single crystal graphite exhibits a sharp negative dip at
T=35°K and a positive peak centered at 120°K. Subtracting the diffusion component (
Remark: Graphics omitted.) by use of an appropriate assumption, they have separated the phonon drag contribution (
Remark: Graphics omitted.) from (
Remark: Graphics omitted.). To get a theoretical explanation for (
Remark: Graphics omitted.), coupled Boltzmann equations for carriers and phonons are solved on the basis of a simplified ellipsoidal band model. The calculated (
Remark: Graphics omitted.) is proportional to
T−3 above the dip temperature
Td(35°K) and at
T<
Td it tends to zero as
T2∼4 with decreasing temperature. These behaviors are in qualitative agreement with the observed result.
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Motohiko Saitoh
1970 Volume 29 Issue 6 Pages
1470-1478
Published: December 05, 1970
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The temperature dependences of the magnetic susceptibilities and the transport coefficients are calculated for a simplified model of heavily doped semiconductors. The treatments are based on the Green function method for a disordered system which was developed in the two preceding papers of this series. A brief comparison with existing experiments on InSb, Ge, and Si is also made.
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Kunio Fujiwara
1970 Volume 29 Issue 6 Pages
1479-1490
Published: December 05, 1970
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A many-body theory for nearly-free electrons has been constructed by introducing “ Bloch-pair operators,” α
k and β
k, which are related to free-particle operators through the transformation
(
Remark: Graphics omitted.)
where
h is 2π times a reciprocal lattice vector, and θ
h is the sign of the relevant Fourier component,
vh, of the periodic field. This theory has been then applied to the annihilation of positrons in the periodic field. The interaction between a positron and a Bloch electron, has been, for the first time, taken into account through a few simplest diagrams. The result shows that a fairly sharp break of the angular-correlation curve occurs a the hexagonal-zone-face position in copper just as expected from the experiments previously made by the present author and his collaborator.
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Hideaki Ido, Takanobu Suzuki, Takejiro Kaneko
1970 Volume 29 Issue 6 Pages
1490-1494
Published: December 05, 1970
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Thermal expansion of a ferromagnetic compound Mn
5Ge
3 was determined from X-ray powder diffraction data at temperatures ranging from 100 to 400°K. From the thermal expansion curves, values of exchange striction along
a and
c axes were deduced. They are positive along the
a axis and negative along the
c axis respectively, and this fact leads to a weak dependence on pressure of the Curie temperature. Using the present data of the exchange striction, the pressure coefficient of the Curie temperature, (1/
Tc) (d
Tc⁄d
p), was estimated to be 14×10
−13 dyn
−1 cm
2, which agreed well with the directly measured values of 18×10
−13 dyn
−1 cm
2 by the present writers and 15×10
−13 dyn
−1 cm
2 by Block and Pauthnet.
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Michio Kiritani, Hideoki Murakami, Akira Yoshinaka, Akikazu Sato, Sho ...
1970 Volume 29 Issue 6 Pages
1494-1499
Published: December 05, 1970
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Electrical resistivity has been measured on pure aluminum quenched from high temperatures (500°C∼600°C) and aged at low temperatures (−30°C∼−90°C). The decay of the quenched-in resistivity is perfectly second order after an initial transient. The process is concluded, from a discussion related to the clustering process of vacancies, to be controlled by the collision between single vacancies. The migration energy of the single vacancy
Em1 and the difference between the migration energy of the divacancy
Em2 and the binding energy of a divacancy
B2 arc determined to be
Em1=0.64±0.02 eV and
Em2−
B2=0.39±0.02 eV, respectively. No long range interaction is found from the consideration of the coordination number of the collision between single vacancies.
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Kenshiro Nakashima, Yoshio Inuishi
1970 Volume 29 Issue 6 Pages
1500-1512
Published: December 05, 1970
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Recombination centers produced by Co
60 γ-ray irradiation at room temperature were investigated by measuring the temperature dependence and the annealing behaviors of the minority carrier lifetime. Both isochronal and isothermal annealing of the lifetime at a fixed measurement-temperature were observed. The measurement at 150°K show that A-center at
EC−0.17 eV is the most effective recombination center about the region of this temperature in all
p-type specimens. The first order annealing process with an activation energy of 1.27 eV was found in agreement with the values reported earlier. The capture cross section for electrons and holes were estimated to be 1.2×10
−15 cm
2 and 1.8×10
−14 cm
2, respectively. The introduction rate of inverse lifetime measured at 150°K seems to show that A center is introduced at nearly the same rate in both floating zone and pulled crystals. At and above room temperature the recombination center at ∼
EV+0.3 eV was found to control the lifetime. The annealing activation energy of this center was found to be dependent on the kind of impurities, and estimated to be 1.27 and 0.98 eV, in boron- or gallium-doped floating zone specimens, respectively. The reaction order of recovery process of this center was less than one. This center seems to be a complex defect containing a dopant impurity.
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Takenari Goto, Masayasu Ueta
1970 Volume 29 Issue 6 Pages
1512-1521
Published: December 05, 1970
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Optical properties of Pb
++ ion doped CdI
2 crystal having the layer structure have been studied at low temperature. Absorption spectrum consists of two narrow bands at 3860A and 3830A which are active for
E⁄⁄
C and
E⊥
C, respectively. These bands are assigned as due to the allowed transitions from the
A1g ground state to the excited
A2u and
Eu states of Pb
++ ion in the crystal field of
D3d symmetry. Emission spectrum consists of two narrow bands at 3900A and 3970A and a broad band at 5180A. The 3900A band emission is polarized parallel to the
C-axis. The narrow emission bands have the mirror image relations with absorption bands. Both emission and absorption bands show the complex phonon structures. The main phonons relevant to the structures have energies 16, 49, 64, 70 and 100cm
−1 and the last one appears most prominently.
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Keiichi Yamamoto, Masayoshi Yamada, Kenji Abe
1970 Volume 29 Issue 6 Pages
1521-1528
Published: December 05, 1970
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The optical modulation by acoustoelectric domain has been observed in semiconductive CdS single crystal at room temperature. The nature and mechanism for this optical modulation are discussed, as compared with the Franz-Keldysh effect by the high electric field. The electric field in the domain observed here is saturated by 5 kV/cm, while the optical modulation signals rise linearly. There is little shift of the edge, calculated from the experimental and theoretical results of the Franz-Keldysh effect at the saturation field. Furthermore, the optical modulation signals are clearly visible for several nanoseconds after the applied voltage is removed. Therefore, the optical modulation is not caused by the high electric field but is associated with the intense acoustic flux in the domain. Using the optical modulation technique, the acoustic flux reflected at the anode end is observed even for the application of the voltage. The propagation velocity of acoustic domain, where the voltage is applied perpendicular to
c axis of the crystal, varies from 1.75×10
5 cm/sec to 1.70×10
5 cm/sec, according as the applied field is increased up to 2110 V/cm.
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Minoru Furukawa, Yasunobu Fujimori, Kinshiro Hirakawa
1970 Volume 29 Issue 6 Pages
1528-1532
Published: December 05, 1970
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Ultrasonic attenuation measurements in KMnF
3 have been performed with 20 and 60 MHz near the
Γ25 soft phonon mode transition point which had been believed as a second order transition. The observed attenuation constant α obeys the formula α∝ω(
T⁄
Ta−1)
−β for
T>
Ta with
Ta=187.2°K and β=1.3±0,1, where ω is the frequency of sound. Measurements of anomalous heat capacity show, however, that the phase transition is not a second order but a first order with
Tc≅186.65°K accompanied with a very little thermal hysteresis. There is a definite difference between the real transition point
Tc and the asymptotic point
Ta of the attenuation constant α given above.
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J. Forssell, B. Persson
1970 Volume 29 Issue 6 Pages
1532-1545
Published: December 05, 1970
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It has been shown that during the growth of thin Cr films condensed on Ultrahigh Vacuum cleaved NaCl and KCl crystals a New Modification of Cr (NMCr) appears, probably as a growth phase. On both substrates the NMCr appears in oriented structures closely related to the orientations of the substrate surface. Electron diffraction patterns caused by the NMCr can be completely interpreted by assuming the genuine A15 type structure. Subsidiary weak reflections which by structure factor considerations are forbidden can be satisfactorily explained by a double diffraction mechanism involving agglomerates of particles. Dark field examinations of the reflections have revealed three different particle orientations. Since the NMCr always appears together with bcc Cr the latter has also been investigated.
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Kiyohumi Ota, Yoshihiro Ishibashi, Yutaka Takagi
1970 Volume 29 Issue 6 Pages
1545-1551
Published: December 05, 1970
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All elastic constants of sodium nitrite have been determined by the measurement of ultrasonic velocity. Absorption coefficients α
11, α
22 and α
33 and their temperature dependence have been studied with special emphasis on their behavior in the temperature range of the phase transition. It turned out that the α
22 seems to obey the expression α
22∝{−ln(
T−
TN)+
A}
2 in the temperature range immediately above
TN.
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Masakatsu Sakisaka, Tetsuo Yamazaki, Minoru Takasaki, Shunsuke Nakamot ...
1970 Volume 29 Issue 6 Pages
1551-1556
Published: December 05, 1970
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Multiple scattering of protons (0.407, 0.851 and 1.45 MeV) and nitrogen ions (1.28 and 2.29 MeV) on copper has been studied. The observed angular distributions are compared with Molière’s theory and some deviations are found. However, these can be diminished by introducing the effective atomic number,
zeff, of incident ions. The appropriate
zeff’s are estimated as 0.87, 0.90 and 0.94 for the protons, respectively. The values 5.2 and 6.2 are obtained for the respective nitrogen ions. The effective atomic number is attributed to the electron screening of slow ion during the collision process.
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Hiroshi Yamashita, Riso Kato
1970 Volume 29 Issue 6 Pages
1557-1561
Published: December 05, 1970
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Vacuum ultraviolet absorption in alkali-nitrites (NaNO
2 and KNO
2) and alkali-nitrates (LiNO
3, NaNO
3, KNO
3, RbNO
3 and CsNO
3) has been investigated in the region from 5 to 23 eV at room and liquid nitrogen temperatures. Two types of absorption bands are observed for each of these salts with polyatomic anions. One of them appears at about 6 eV and is relatively insensitive to the change of temperature and cation partners, while the other which appears in the region from 8 to 12 eV is quite sensitive. The bands of the former type are assigned to electronic transitions in the anions and those of the latter type to some transitions corresponding to electron transfer from anion to cation.
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Toshiaki Kakitani
1970 Volume 29 Issue 6 Pages
1562-1570
Published: December 05, 1970
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Intensities of the fine structure in the electronic transition
A1g–
B2u, allowed through molecular vibrations in the ground or excited state, are analyzed within the first order approximation in the electron-vibration interaction, processes of the simultaneous emission or absorption of one quantum or several quanta of the vibration being considered. In the analysis three parameters are chosen; one is the ratio of the two electron-vibration coupling constants and the others are parameters associated with the structure of benzene in the excited state. The result is in good agreement with the experiment.
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Akio Isomoto, Hiroshi Watari, Masao Kotani
1970 Volume 29 Issue 6 Pages
1571-1577
Published: December 05, 1970
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Bleany’s theory of the
g-value dependence of EPR transition probability is extended to a general case of rhombic ligand field by assuming that the system has a fictitious spin of 1/2. Given three principal
g-values and a line shape function, changes in EPR spectra of polycrystalline aggregates with static magnetic field are calculated and a general equation of spectral curve are obtained. In the limiting case of a zero line width, the equation is reduced to an elliptic integral. This approach is applied to the simulation of the EPR spectra of normal and abnormal haemoglobins and pyrocatechase, and the theoretically and experimentally obtained spectra exhibit a good fit.
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Osamu Aono
1970 Volume 29 Issue 6 Pages
1577-1579
Published: December 05, 1970
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A New concept of dressed ion is proposed, which is not a point particle. The electrons are regarded as a dielectric medium. The dressed ion polarizes the medium, causing a frictional force between them, which governs the electric current. Concise expression is obtained, which is valid for any stable and uniform plasma in the absence of external magnetic field, and to which complicated expressions based on former theories reduce after careful rearrangement.
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Akihiro Mohri, Masafumi Azumi
1970 Volume 29 Issue 6 Pages
1580-1592
Published: December 05, 1970
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Magnetic field systems with
l=2 helical windings of fairly short pitch have large rotational transform and high shear. This high shear promises the formation of average magnetic well, when a vertical field is externally applied.
A hybrid field having mainly
l=2 and
l=3 helical fields can be produced by deforming
l=2 helical windings. This field has a deep well and its current system is very simple.
Numerical calculations using Biot-Savart’s law show that these improvements are realized in practice.
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Yoshimitsu Amagishi
1970 Volume 29 Issue 6 Pages
1592-1597
Published: December 05, 1970
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A mercury plasma is perturbed experimentally by a slow electron beam whose velocity is of the order of a thermal velocity of medium electrons. A special but a simple gun is used to drive the slow electron beam into a plasma region. The beam is therefore considered to be of the drifted Maxwellian distribution. Instabilities are classified into the two types; one of them is a wave of beam-electron coupling and the other is a wave of beam-ion coupling. Unstable regions are shown as a function of the frequency and the electron beam velocity, and explained on the basis of the theory of drift instability in three-component plasma system.
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Toshiro Ohnuma, Yoshisuke Hatta
1970 Volume 29 Issue 6 Pages
1597-1608
Published: December 05, 1970
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Wave-wave coupling among ion waves is investigated, experimentally and theoretically. When two ion waves of different frequencies of
f1 and
f2 are excited by one grid, the signals of the harmonic (2
f1) and
f1−
f2 are detected by another grid. They are found to grow spatially in some region, on the contrary to those of
f1 and
f2 which decrease monotonously in the region. The growing regions of the harmonic and
f1−
f2 are in accord with those obtained from the theory of the wave-wave coupling among ion waves. The propagation of small-amplitude wave under the large-amplitude wave and the propagation of ion wave with large-amplitude are also investigated.
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R. S. Nanda, H. K. Mohanty
1970 Volume 29 Issue 6 Pages
1608-1618
Published: December 05, 1970
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Free convection boundary layer flow of an electrically conducting fluid past a vertical flat plate in the presence of a magnetic field, perpendicular to the force of gravity, is analysed. Thermal and viscous boundary layers are separately treated with different polynomials, representing the velocity and temperature profiles in different regions of the boundary layers. The flow, the rate of heat transfer and the skinfriction are discussed for high and low Prandtl numbers.
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Isamu Nakata
1970 Volume 29 Issue 6 Pages
1619-1625
Published: December 05, 1970
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The effects of an aligned uniform magnetic field upon the stability of a two-dimensional jet of an incompressible, electrically conducting fluid with small magnetic Prandtl number are investigated for flows of large Reynolds number. The condition for stability is obtained as a relation between the wave number, the Reynolds number, and the Alfvén number for small magnetic Prandtl number.
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Kuh Kim, Chung Oh Lee, Chul Soo Kim
1970 Volume 29 Issue 6 Pages
1625-1634
Published: December 05, 1970
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This study deals theoretically with the bulk instability of a viscous, incompressible, slightly conducting, dielectric fluid contained between two coaxial cylinders with a radial temperature gradient and under a radial electric field. A gradient in electrical conductivity resulting from the temperature gradient causes free charges to accumulate in the fluid when the electric field is applied. In the case considered, the gradient in dielectric constant can be neglected with the significant electric force being that due to the free charges. It is found that the stability criteria depend on the magnitude of the imposed potential, temperature gradient, fluid properties and geometrical configuration. In solving the stability problem by the linear perturbation theory it is assumed that the motion due to instability is two-dimensional and stationary. The limiting cases when the electrical conductivity goes to infinity or zero are discussed.
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Eiji Hasegawa, Choji Nakaya
1970 Volume 29 Issue 6 Pages
1634-1639
Published: December 05, 1970
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The stability of a thin liquid layer down the surface of a vertical cylinder is studied in the presence or surface tension. The curvature of the cylinder intensifies instability of the flow in comparison with the plane flow. The flow on the inner face of a cylinder is found to be more unstable than the flow of the same liquid layer on the outer face.
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Carl E. Patton, Soshin Chikazumi
1970 Volume 29 Issue 6 Pages
1640
Published: December 05, 1970
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Tetsuro Nakamura, Toshiyuki Sata
1970 Volume 29 Issue 6 Pages
1641-1642
Published: December 05, 1970
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Kiyoshi Kojima, Satoru Murase, Kiyoo Sato, Kengo Adachi
1970 Volume 29 Issue 6 Pages
1642
Published: December 05, 1970
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Kiyoshi Kojima, Masaaki Matsui, Kiyoo Sato, Kengo Adachi
1970 Volume 29 Issue 6 Pages
1643-1644
Published: December 05, 1970
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G. T. Stevens
1970 Volume 29 Issue 6 Pages
1644
Published: December 05, 1970
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Chikara Sugiura, Yasuomi Hayasi, Hiroyosi Konuma, Shigeru Sato, Makoto ...
1970 Volume 29 Issue 6 Pages
1645
Published: December 05, 1970
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Nobukata Nagasawa, Takao Nanba, Tsutomu Karasawa
1970 Volume 29 Issue 6 Pages
1646
Published: December 05, 1970
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Shigeo Honda, Masao Tomura
1970 Volume 29 Issue 6 Pages
1647
Published: December 05, 1970
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Nobuhiko Ohama, Yasunori Okamoto, On Matumura
1970 Volume 29 Issue 6 Pages
1648
Published: December 05, 1970
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Tetsuo Kitai, Takasi Okubo, Takeo Morita
1970 Volume 29 Issue 6 Pages
1649-1650
Published: December 05, 1970
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Tetsuro Nakamura, Toshiyuki Sata
1970 Volume 29 Issue 6 Pages
1650
Published: December 05, 1970
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Satoru Fujime, Shin’ichi Ishiwata
1970 Volume 29 Issue 6 Pages
1651
Published: December 05, 1970
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P. Chandrasekhara Raju, K. Subbarao
1970 Volume 29 Issue 6 Pages
1652
Published: December 05, 1970
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Katsumi Kondo, Yoshinobu Kawai
1970 Volume 29 Issue 6 Pages
1653
Published: December 05, 1970
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Takeo Kamegaya, Yutaka Imahori, Seiki Ejima, Tsukasa Shimizu
1970 Volume 29 Issue 6 Pages
1654
Published: December 05, 1970
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Yoshio Sone
1970 Volume 29 Issue 6 Pages
1655
Published: December 05, 1970
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