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Tsuguo Takahashi
1976Volume 41Issue 2 Pages
688-694
Published: August 15, 1976
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The steady flow of a non-equilibrium ionized gas past an insulated sinusoidal wall, in the presence of an aligned magnetic field, is studied in the linearized approximation. The analytical expressions of the perturbations of the flow field is obtained for an arbitrary magnetic Reynolds number. The perturbations are expressed as a sum of two parts propagating along the two straight lines. To show the effects of the relaxation at finite magnetic Reynolds numbers, the drag exerted on the wall is calculated and compared with that of the conventional magnetogasdynamic flow.
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Rolf Landauer
1976Volume 41Issue 2 Pages
695-696
Published: August 15, 1976
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Darci Motta de Souza Esquivel, Amando Siuiti Ito, Sadao Isotani
1976Volume 41Issue 2 Pages
697
Published: August 15, 1976
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Tatsuyuki Kawakubo, Shigeharu Kabashima, Manabu Itsumi
1976Volume 41Issue 2 Pages
699-700
Published: August 15, 1976
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The oscillatory mode in a self-sustained oscillator is found to be suppressed by an external noise. The oscillatory to non-oscillatory state transition is analogous to the phase transition in displacive type ferroelectrics which is caused by raising temperature.
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Ryo Suzuki, Yutaka Sugita
1976Volume 41Issue 2 Pages
701-702
Published: August 15, 1976
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Influence of the planar domains associated with bubbles has been investigated in a Permalloy-coated garnet film. Both the bubble velocity and the stability of the bubble domain wall state are strongly affected by the direction of the planar domain walls-tails with respect to the direction of bubble motion. Bubbles move faster when the tails are behind (forward motion) than when the tails are ahead (backward motion). The range of in-plane field where the initial domain wall states is retained is wider in the forward motion than in the backward motion. These differences are related to the dynamics of the planar domains.
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Yasuo Yamaguchi, Hiroshi Watanabe, Takashi Suzuki
1976Volume 41Issue 2 Pages
703-704
Published: August 15, 1976
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The magnetization of Mn
1+δSb is known to decrease linearly with increase of the amount, δ, of the excess Mn atoms. Therefore, the magnetic moments of the excess Mn atoms were considered to be directed antiparallel to the regular site Mn moments. The magnetic polarization of the excess Mn atom is studied for Mn
1.05 Sb and Mn
1.18 Sb by using the polarized neutron technique. It is observed that there is no magnetic moment on the excess Mn atoms. Therefore the decrease of the magnetization with increasing δ comes from the decrease of the magnetic moment on the regular site Mn atoms, and this result suggests that an excess Mn atom donates electrons to the regular site Mn atoms.
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Gendo Oomi, Tadayasu Mitsui
1976Volume 41Issue 2 Pages
705-706
Published: August 15, 1976
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The electrical resistivity of α-Ce and α-Ce
0.97La
0.03 alloy was measured as a function of temperature in the range of hydrostatic pressure from 0 to 10 kbar. The values of the coefficients (
A) of
T2-term decreased with increasing pressure and increased with a concentration of La. The value of
A at 3 kbar obtained in the present work was about half of the one by Katzman and Mydosh.
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Hiroshi Ohkura, Tohru Watanabe, Denbei Nakamura, Yuzo Mori
1976Volume 41Issue 2 Pages
707-708
Published: August 15, 1976
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Microwave saturation of the ESR signal for the
FA(Li) centers in KCl and KBr has been studied in slow passage condition. The values of T
1 and T
2 have been estimated from the curve-fitting with theoretical forms. The values of T
2 at liquid He temperatures are anomalously decreased in comparison with T
2 at 77 K. A tentative relaxation mechanism, which is related to tunneling motion of the Li
+ ion, is proposed.
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Takao Kuroda, Shin-ichiro Narita
1976Volume 41Issue 2 Pages
709-710
Published: August 15, 1976
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Surface cyclotron resonance of electrons in an inversion layer on
p-Hg
1−xCd
xTe has been studied. With increasing surface charge density, we find three resonance peaks due to different electric subbands. The surface electron effective masses at zero gate voltage are compared with those obtained by the Shubnikov-de Haas effect.
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Hiroyuki Nagashima, Hitoshi Yamazaki
1976Volume 41Issue 2 Pages
711-712
Published: August 15, 1976
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The decay time of induced magnetization
Mz of donor electrons is observed for (Si: P) samples having impurity concentrations 5.6×10
17≤
Nd≤2.7×10
18 donors/ cm
3 in the 1.2–4.2 K temperature range. The results show that the spin-lattice relaxation time
T1 increases with increasing donor concentration and becomes so close to the spin-spin relaxation time
T2 in the intermediate concentration region of transport phenomena.
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Tadashi Itoh, Yasuo Nozue, Masayasu Ueta
1976Volume 41Issue 2 Pages
713-714
Published: August 15, 1976
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Two-photon Raman spectrum is observed in the spectral regions of the
M,
PM and
P bands which are the characteristic emissions under the high density excitation. The relation between energies of Raman peak
hν
R, and incident dye laser photon,
hν
inc, is expressed by
hν
R=2
hν
inc−
EX(L),
where
EX(L) is the energy of the longitudinal exciton.
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Yoshiko Nasu, Sachio Koizumi, Nobukata Nagasawa, Masayasu Ueta
1976Volume 41Issue 2 Pages
715-716
Published: August 15, 1976
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Giant two-photon absorption for the direct generation of excitonic molecue is measured. Three absorption peaks are found at 2.9540, 2.9561 and 2.9576 eV, which are responsible for the two-photon transitions to the
Γ1(
J=0), Γ
5(
J=2) and
Γ3(
J=2) states, respectively, of the excitonic molecule.
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Toshirou Yagi, Hirokazu Tanaka, Itaru Tatsuzaki
1976Volume 41Issue 2 Pages
717-718
Published: August 15, 1976
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Brillouin scattering experiments have been made on KH
3(SeO
3)
2. The frequency of the transverse acoustic wave with the wave vector
q⁄⁄[010] and the polarization ξ⁄⁄[001] approaches to zero at the transition temperature with decreasing temperature. The intensity of the Rayleigh line rapidly increases below about −50°C.
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Yasunari Takagi, Yasufumi Wakabayashi, Takeshi Shigenari
1976Volume 41Issue 2 Pages
719-720
Published: August 15, 1976
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A LO mode corresponding to the Fleury’s “soft” TO mode at 47 cm
−1 was measured by a backward and a right angle Raman scattering. Both of the LO and TO modes have the same temperature dependence, which is distinctly different from the result of Ganguly
et al. It is concluded that above
Tc the Fleury’s mode is neither a B
2(TO) nor a A
1(TO) mode but a
T2 mode of the Brillouin zone boundary, and the very little difference between LO and TO is the result of the fact that the soft mode of GMO is not directly responsible for the spontaneous polarization below
Tc.
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Yasunori Yamazaki, Ryuichi Shimizu, Hatsujiro Hashimoto
1976Volume 41Issue 2 Pages
721-722
Published: August 15, 1976
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Numerical calculations of electron spin polarization (ESP) and differential cross section have been done for electrons of energies 300–2000 eV. The purpose of the present letter is, from the view point of experiment, to clarify some ambiguity in argument of the experimental conditions,
e.g. effect of angular resolution and statistical error of detector. The numerical calculations based on the potential scattering of Dirac equation, neglecting the exchange and charge polarization effects, suggest the practical guide for the experiment of low energy ESP detector, which is under construction.
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Takumi Yamamoto, Takashige Tsukishima
1976Volume 41Issue 2 Pages
723-724
Published: August 15, 1976
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We observed, by microwave scattering method, that two ion acoustic waves with frequencies
f0⁄3 and 2
f0⁄3, and wave numbers
k0⁄3 and 2
k0⁄3, were simultaneously excited in an argon positive column, when the amplitude of the pump ion acoustic wave with
f0 and
k0 exceeded a certain value. The pump wave was excited externally by means of a grid. The value of
f0 was well below the ion plasma frequency
fpi. The threshold value agreed roughly with a theoretical one calculated from the coupled equations for the subharmonic waves.
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Kimitaka Itoh, Sanae Inoue, Shoichi Yoshikawa
1976Volume 41Issue 2 Pages
725-726
Published: August 15, 1976
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Finite amplitude solution of helical equlibria of current-carrying plasmas bounded by a perfectly conducting cylinder is obtained. The nonlinear saturation levels of the fixed boundary MHD modes are also obtained near the marginal stable points. It is shown that by shaping the current density profile the saturation levels can be suppressed.
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Yoiti Watanabe
1976Volume 41Issue 2 Pages
727-728
Published: August 15, 1976
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The Bäcklund transformation, known as the self-mapping on the sine-Gordon equation is found to be a special case of continuous two-parametric transformations. It is a kind of extended canonical transformations defined in the double-fold integral dynamics. This fact motivates to explore into the physical meanings of that transformation.
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