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Volume 21, Issue 12
Displaying 1-50 of 55 articles from this issue
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Susumu Morita, Takemi Nakagawa, Hsu Chu-Chung, Lee Sang-Mu1966 Volume 21 Issue 12 Pages 2435-2438
Published: December 05, 1966
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe reaction F19(p, α0)O16 was studied with the bombarding energies of a few MeV proton. Excitation curves were measured at 90° and 135° (1ab.) from 2.24- to 3.35-MeV with the energy step of about 20 KeV. The angular distributions were measured at twelve energies in the region between 2.64- and 3.35-MeV. Most of the angular distributions are asymmetric with respect to 90° (C. M.). The data were analyzed with the theory of fluctuation and the coherence energy Γ was found to be 60 KeV, which corresponds to the lifetime of compound nucleus τ of 1.1×10−20 sec.. The ratio of the direct reaction to the compound process, xD=σD⁄⟨σ⟩, was found to be zero at 90° (1ab.) and 0.90 at 135° (1ab.) and also for the integrated cross section.View full abstractDownload PDF (516K) -
Yoshihiro Tagishi, Takeki Iwashita, Seizaburo Kageyama1966 Volume 21 Issue 12 Pages 2439-2444
Published: December 05, 1966
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe decay of Sb129 has been studied with Li-drifted germanium and scintillation spectrometers. Singles and β-γ and γ-γ coincidence spectra were observed. Gamma rays with energies 180, 296, 358, 410, 523, 544, 652, 683, 760, 813, 876, 916, 967, 1028, 1048, 1240, 1300, 1520, 1730, 1840 and 2070 keV, and beta branches with end-point energies 0.58, 0.70, 1.06, 1.55, 1.82 and 2.24 MeV were found. The relative intensities of these gamma and beta rays were estimated. The half-life of Sb129 was determined to be 4.35±0.05 h. The present data are consistent with a level scheme with states at 544, 813, 1227, 1637, 1729, 1841 and 2064 keV.View full abstractDownload PDF (684K) -
Kim Dong-Hyok1966 Volume 21 Issue 12 Pages 2445-2461
Published: December 05, 1966
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe (α, d) reactions in Mg24, Si28, S32 and Ca40 have been studied by using 29.0 MeV alpha particles. The energy spectra of deuterons obtained were dominated by two or more strongly excited levels. Levels at 2.73, 3.64 4.06 and 4.79 MeV of Cl34 are identified to be 2−, 5−, 3− and 4− states, respectively, which arise from a (d3⁄2 f7⁄2) configuration, by the use of the relation between the particle-particle and the particle-hole interaction energies, which is given by the shell theory. Levels at 3.60 MeV of Al26 and 4.17 MeV of P30 are identified to have the same (d3⁄2 f7⁄2) 5 configuration as the 3.64 MeV level of Cl34 from their large spectroscopic amplitude, the similarity of their angular distribution and the relationship between their reaction Q values and the mass number of the residual nuclei. Levels at 7.11 MeV of P30, 5.23 MeV of Cl34 and 0.60 MeV of Sc42 are identified to have a (f7⁄2)27 configuration from the reason mentioned above and the results of the DWBA calculation.View full abstractDownload PDF (1940K) -
Dai-Ca Nguyen1966 Volume 21 Issue 12 Pages 2462-2475
Published: December 05, 1966
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSAngular distributions of the elastic and inelastic scatterings of deuterons from Be9, C12, N14 and O16 were measured by means of a broad range magnetic spectrograph with nuclear emulsion plates at intervals of 5° between 10° and 80° in the laboratory system. Deuterons leading to the 2.31 MeV T=1 state of N14 were not distinguished from the background so that the violation of the isobaric spin selection rule was not observed. For Be9, the 2.43 MeV 5/2− rotational state was excited more strongly than the neighboring states. The 4.43 MeV rotational state of C12 was also strongly excited. In the case of O16, the 6.14 MeV 3− octupole vibrational state was resolved from the 6.06 MeV 0+ state and was found to be excited more strongly than the 6.06 MeV 0+ state and also than the 6.92 MeV 2+ and 7.12 MeV 1− states. Comparison with the inelastic scattering data of protons and of alpha particles indicates that collective states which are excited strongly by protons and by alpha particles are also excited strongly by deuterons. Experimental angular distributions are compared with the predictions of the nuclear interaction theory of Huby and Newns and of the diffraction theory of Dar, and with the results from the DWBA analysis.View full abstractDownload PDF (1692K) -
Tatsuo Kawasaki, Tetsuro Tanaka1966 Volume 21 Issue 12 Pages 2475-2485
Published: December 05, 1966
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSGalvanomagnetic effects were measured on p- and n-CdSb single crystals above 77°K in weak magnetic fields (≤7500 gauss). No anisotropy of the Hall coefficient was observed below 250°K. The Hall mobility at 200°K was 390, 250 and 650 cm2/v·sec for holes and 520, 440 and 560 cm2/v·sec for electrons along the [100], [010] and [001]-directions, respectively. The mobility of holes along the [001]-direction was constant up to 3×1016cm−3. The anisotropy of the transverse magnetoresistance coefficient was found to be larger for p- than for n-CdSb. The longitudinal magnetoresistance in n-CdSb does not vanish in any direction; in p-CdSb it does not vanish in the [100] and in the [010]-directions. A four valley model is proposed for the valence band structure.View full abstractDownload PDF (1340K) -
Hajime Ozaki, Nobuo Mikoshiba1966 Volume 21 Issue 12 Pages 2486-2496
Published: December 05, 1966
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA nonlinear theory is given of the current saturation in cadmium sulfide at room temperature when the drift velocity of electrons exceeds the velocity of sound. The constitutive equations consist of the coupled Boltzmann equations for conduction electrons and amplified phonons. The classical expressions are used for the amplification of phonons and the linear loss of amplified phonons by thermal phonons. Although a three-phonon process via a nonlinear interaction with electrons is taken into account, the expression for the “nonlinear relaxation time” involves an adjustable parameter. When a reasonable value of the parameter is chosen, the theory explains semiquantitatively (1) the current-voltage characteristics, (2) the decay time of current from ohmic to saturation values, and (3) the characteristics of acoustoelectric-after-current.View full abstractDownload PDF (1351K) -
Atsushi Tsuchida1966 Volume 21 Issue 12 Pages 2497-2505
Published: December 05, 1966
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA temperature-dependent absorption band was observed in the infrared region for KNiF3 below the Néel temperature (TN=275°K). The peak is located at 1230 cm−1 at 100°K and shifts to the longer wave-length side with increasing temperature. This band can be attributed to a phonon-induced electric dipole transition of the spin system which has been discussed by Mizuno and Koide. The exchange parameter for KNiF3 is determined from the peak position to be J=52.3°K or 55.3°K.View full abstractDownload PDF (860K) -
Shuichi Iida, Hirosi Miwa1966 Volume 21 Issue 12 Pages 2505-2539
Published: December 05, 1966
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe relaxation character of the induced uniaxial anisotropy in CoxFe3−xO4 has been analyzed theoretically, employing several models and taking into account the presence of short range ordering and the detailed micro processes of vacancy migration mechanism. It is shown on mathematical grounds that the relaxation times of the processes are inversely proportional to the density of the cation vacancies, ρ, in the crystal. The accurate solution of the relaxation time can be derived specifically for the range of x=10−(1.5∼2). It is
1⁄τ=4.65·ρ·\barfexp(−\barQ⁄kT).
The experimental results by Inoue are well described by this equation after putting \barf=7.5×1012sec−1, and \barQ=1.0 eV at x=0.063. A theory is presented which takes into account the symmetry of the crystal lattice rigorously. The theory is in excellent agreement with the single crystal results by Palmer. It is pointed out that the cobalt ion neighboring a vacancy is in a trivalent state, and that electron transfer is important in lowering the activation energy of the ionic migration.View full abstractDownload PDF (4152K) -
Motohiko Saitoh1966 Volume 21 Issue 12 Pages 2540-2550
Published: December 05, 1966
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA general expression for the galvanomagnetic coefficients of hot electrons in an anisotropic medium is derived on the basis of the Boltzmann transport equation. The expression is applied to a nondegenerate piezoelectric semiconductor to understand the observed anisotropy and the field dependence of the Hall mobility of cadmium sulfide. Two mechanisms, piezoelectric and deformation potential scatterings, are considered, and a distribution function is derived by solving the Boltzmann equation directly. Satisfactory agreement between theory and experiment is obtained by taking the electron effective mass 0.17 m0 where m0 is the bare electron mass and the deformation potential constant Ξ=16±2 eV. The anisotropic effect at low temperatures is concluded to be due to the anisotropy of piezoelectric tensors which characterizes the scattering. Effects due to other scattering mechanisms are discussed.View full abstractDownload PDF (1208K) -
Sonoko Tsukahara, Hisazo Kawakatsu1966 Volume 21 Issue 12 Pages 2551-2568
Published: December 05, 1966
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSMagnetic domain structures of Ni–Fe and Ni–Co films, which were vacuum-condensed on NaCl single crystals at various temperatures (20–600°C) or prepared by polishing bulk crystals, have been observed at elevated temperatures up to 800°C by transmission electron microscopy. In general, no change was observed in domain configuration except in the ripple structure at temperatures below a certain critical temperature Tdc; however, there were exceptions: with polished films showing large magnetostriction or with condensed films, especially those consisting of fine grains, which showed large magnetostriction, it was often observed that the domain structure did change in this temperature range. The domain structures seemed to disappear at Tdc, which was 0–200°C lower than the Curie point Tc and was different from film to film depending on the film composition, grain size and effective anisotropy. When the temperature was decreased from Tdc, an isotropic mesh-like domain configuration appeared just below Tdc, which at lower temperatures, was rearranged into a configuration of domains with larger sizes. Such a mesh pattern was not observed with polished films.View full abstractDownload PDF (9040K) -
Hiizu Fujita, Koichi Kobayashi, Kimio Takano1966 Volume 21 Issue 12 Pages 2569-2586
Published: December 05, 1966
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMagnetoresistance of photoelectrons in CdS has been measured in a transient condition as a function of magnetic field, electric field and of their directions relative to the crystal axis in the temperature range from 1.9°K to 78°K by using pulsed light and a pulsed electric field. A difference is observed between E||c and E⊥c in low field transverse magnetoresistance at 1.9°K and 4.2°K but not at 78°K, indicating a dominant contribution of anisotropic scattering by the piezoelectric field at low temperatures. The longitudinal magnetoresistance is found to be almost zero. The transverse magnetoresistance is observed to increase according to the H2 law but deviates from it at high magnetic fields. The low magnetic field magnetoresistance decreases above a certain critical electric field where the photoresponse does not obey the Ohm’s law because of a hot electron effect. The hot electrons are found to be cooled by application of a magnetic field.View full abstractDownload PDF (2260K) -
Takasi Sagawa, Yasuo Iguchi, Michio Sasanuma, Takao Nasu, Shigeo Yamag ...1966 Volume 21 Issue 12 Pages 2587-2598
Published: December 05, 1966
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSSoft X-ray absorption spectra of typical alkali chlorides, KCl and NaCl, were observed by using as a continuous background the synchrotron radiation from the 750 MeV electron synchrotron in the Institute for Nuclear Study, Tokyo. The L2,3-absorption spectrum of Cl− in these chlorides has been obtained. The spectrum shows one or two sharp absorption maxima at the long wavelength limit and a rapid increase in absorption at about 9 eV above the limit. A shoulder-like structure is observed at the foot of the second absorption band. A tentative X-ray energy level diagram suggests that the shoulder corresponds to the onset of interband transition from L3 to the conduction band. The first absorption maximum is accordingly interpreted as the excitation of a stable X-ray exciton; a metastable X-ray exciton seems to be involved in the second maximum. The spectral behavior of the L2,3-absorption near the long wavelength limit has some similarity to the optical absorption spectrum in the vacuum ultraviolet region. It is suggested that the sharp rise in absorption at about 9 eV above the limit is due to two electron excitation by a single photon.View full abstractDownload PDF (1328K) -
Kazuko Kubo1966 Volume 21 Issue 12 Pages 2599-2601
Published: December 05, 1966
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe dielectric breakdown under proton bombardment of LiF was studied. Negative electrolytic breakdown figure was observed which was similar to that obtained by the conventional point-to-plate discharge. It is suggested that the breakdown is due to the potential difference between the range plane of the bombarding protons and the earthing point on the opposite surface. The breakdown figure consists of random and ⟨100⟩ paths with layers of precipitated Li metal.View full abstractDownload PDF (1628K) -
Takasi Sagawa, Yasuo Iguchi, Michio Sasanuma, Arisato Ejiri, Shiro Fuj ...1966 Volume 21 Issue 12 Pages 2602-2610
Published: December 05, 1966
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSSoft X-ray absorption spectra of Be, Al, Sb and Bi, and Al–Mg alloys have been obtained by the use of synchrotron radiation emitted from the 750 MeV electron synchrotron at the Institute for Nuclear Study, Tokyo, as a continuous light source. The K-absorption structure of beryllium was found to agree with the density of states calculated by Loucks and Cutler. Some correspondence was found between the maxima in the L2,3-absorption spectrum and the K-absorption spectrum of aluminum. A remarkable band was observed in the L2,3-absorption spectrum of aluminum at 23 eV above the edge. This band is not attributable to the singularity in the state density of the conduction band. A tentative interpretation based on the delayed onset of transitions 2p-∞d is proposed. The L2,3-absorption spectrum of aluminum in Al–Mg alloy shows a remarkable degeneration of the edge, while the L2,3-absorption edge of magnesium in the same alloy seems relatively unaffected. This behavior is similar to the effect reported by Appleton and Curry on the L2,3-emission edge of both elements in Al–Mg alloy.View full abstractDownload PDF (1160K) -
Atsuo Imai1966 Volume 21 Issue 12 Pages 2610-2615
Published: December 05, 1966
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSOptical measurements were made on several crystals of n-type α-SiC in the ranges 1 to 5μ (Range I) and 15 to 30μ (Range II) at 300°K and at 500°K. The absorption coefficient α is nearly proportional to the square of wavelength, increases with increasing donor concentration ND and decreases with the rise in temperature in Range I. These results can be explained by the direct transition of electrons from donor levels to conduction band rather than the intraband transitions of the free carriers. The relative magnitudes of α in Ranges I and II support the above conclusion.
In Range II, the value of α increases with the increase in ND and depends weakly upon λ; the electrical susceptibility has a positive sign. The direct transition still seems to contribute appreciably in Range II.View full abstractDownload PDF (700K) -
Tomoyuki Takeuchi1966 Volume 21 Issue 12 Pages 2616-2622
Published: December 05, 1966
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA twin band was introduced on a definite position in an iron single crystal under an impact compression. The propagation velocity of the twin head was determined from the time interval of signals from two resistance strain gauges stuck on the trace of the twin band. The propagation velocity of the screw type twin head was found to be 2.5 mm/μ sec, which was substantially independent of temperature in the range −196°∼+123°C. The signal from a strain gauge stuck in the neighbourhood of a twin trace showed that the stress around the head of a dynamically propagating twin was about one half of the applied stress. Such elastic disturbances around the twin head may determine the saturation thickness (∼2μ) of a dynamically propagating twin band.View full abstractDownload PDF (904K) -
Teruya Shinjo, Koji Kosuge1966 Volume 21 Issue 12 Pages 2622-2626
Published: December 05, 1966
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSMössbauer measurements on Fe57 doped in V2O3 were made in the temperature range from 4.2°K to 300°K. Above the metal-to-semiconductor transition temperature (∼140°K), the absorption spectrum was perfectly paramagnetic. On the other hand, below that temperature, there appeared a magnetic hyperfine splitting (400kOe at 4.2°K and 315 kOe at 131°K). This is concluded to be due to an antiferromagnetic order of V2O3 in the low temperature phase. The internal field abrupty disappeared at the transition temperature associated with the first order transition. From the temperature dependence of the internal field, the fictitious Néel temperature of the low temperature phase was deduced to be in the vicinity of 200°K. The valence state of doped Fe seems to be trivalent in both the phases.View full abstractDownload PDF (544K) -
Katsue Hasegawa, Susumu Yoshimura1966 Volume 21 Issue 12 Pages 2626-2633
Published: December 05, 1966
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSBulk photocarriers are produced in anthracene crystal by a Q-switched ruby laser. Laser light of photon energy 1.79 eV is absorbed via two-photon effect leading to exciton states which then annihilate to create charged carriers. The observed dependence of the photocurrent on light intensity is of the fourth and second power in low and high intensity regions, respectively. The fourth law dependence is explained by the mechanism of exciton-exciton interaction for photocarrier generation. While in the high intensity regions, the current is strongly recombination limited. Recombination constant calculated from a recombination decay of photocurrent is about 10−7 cm3 sec−1.
Temperature dependence of the intrinsic photocurrent was studied over a range from 300°K down to 100°K. The generated carrier density is characterised by an activation energy of 0.04 eV. Mobility of holes perpendicuar to the ab plane can also be estimated from the data and was found to vary as T−n, where n=1.6, in this temperature range.View full abstractDownload PDF (976K) -
Yoshie Matsuo, Akira Nagasawa, Jiro Kakinoki1966 Volume 21 Issue 12 Pages 2633-2637
Published: December 05, 1966
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSGold-palladium alloys, ranging around AuPd3 in composition, were studied by electron diffraction using evaporated single crystal films, and a superlattice AuPd3 was found. The temperature of order-disorder transformation was estimated at about 780°C for the alloy with a composition of about 80 at. % palladium. The electron diffraction pattern of the ordered alloy AuPd3 showed that the intensities of the superlattice reflections were extremely weak, though they were sharp. The results mean that the degree of order is of a very reduced value. This special nature of the ordered alloy AuPd3 is discussed by comparing to other ordered alloys of the noble metal-palladium systems.View full abstractDownload PDF (560K) -
Sukeaki Hosoya, Tomoe Yamagishi1966 Volume 21 Issue 12 Pages 2638-2644
Published: December 05, 1966
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe X-ray atomic scattering factor of copper was obtained by absolute measurements of intensities diffracted from powder samples. The data obtained with CuKα and MoKα radiations showed a good argeement with each other. The results did not show such a large “reduction” in the values of the scattering factor as reported by Batterman et al. The results were compared with the theoretical valves calculated by Freeman and Watson for a free atom and those calculated by Wakoh (1966) for an atom in the crystalline state taking the band structure into account. The discrepancies between the experimental values and the theoretical values of either source were found to be within the range of experimental errors; in other words, no conclusive evidence of the solid-state effect was foundView full abstractDownload PDF (924K) -
Akira Fukuhara1966 Volume 21 Issue 12 Pages 2645-2662
Published: December 05, 1966
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSFrom the view-point of the direct application of the dynamical theory rules concerning diffraction amplitudes and intensities under different incident conditions are derived without limitation upon the number of reflections, and some of the approximate approaches to electron diffraction are criticized. The equation does not preserve the invariant property that Miyake pointed out; many-ray effects become serious when the energy goes up into the relativistic region. Under practicable assumptions about crystals it is possible to reduce the dimension of the fundamental equation, actually, an eigenvalue-equation for an hermitian matrix, and to obtain explicit forms of the solutions in some many-ray cases. The expressions of solutions in terms of the crystal parameters are tabulated for such diffraction configurations. Several examples of numerical estimations are illustrated. Finally a criterion for the number of rays to be taken into account is discussed in connexion with the dynamical potentials due to Bethe.View full abstractDownload PDF (1552K) -
Yasuji Kashiwase, Yoshiro Kainuma1966 Volume 21 Issue 12 Pages 2663-2669
Published: December 05, 1966
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe lattice dynamics of potassium bromide was studied by the measurement of intensities of X-ray thermal diffuse scattering. The observation was made on single crystals of KBr, with faces parallel to (001) and (011), kept in a vacuum chamber at 20°C. CuKα X-rays monochromatized by a quartz crystal were focused on the surfaces of KBr. The intensities of scattered X-rays were measured by using a scintilation counter with a pulse height analyzer.
The effects of longitudinal lattice waves travelling in the directions [001] and [011] were investigated. The measured intensities agreed with the theoretical intensities calculated by using the simple shell model of ions, but not with those calculated by using the rigid ion model.View full abstractDownload PDF (760K) -
Riichirô Chûjô1966 Volume 21 Issue 12 Pages 2669-2673
Published: December 05, 1966
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSPolymerization processes of high polymers are investigated using matrix method of the Ising model. It is shown that information on the polymerization mechanisms can be obtained from the data of high resolution nuclear magnetic resonance spectroscopy. Polymerization of two component copolymers and asymmetric polymerization are examined. The reality of penultimate effect is also discussed. Physical quantities such as monomer reactivity ratios and persistence ratios of asymmetrically polymerized samples are given explicitly as functions of the intensity of nuclear magnetic resonance spectra and also, in some cases, of polymerization temperature.View full abstractDownload PDF (520K) -
Mahendra S. Sodha, Predhiman K. Kaw1966 Volume 21 Issue 12 Pages 2674-2683
Published: December 05, 1966
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe nonlinear generation of the second harmonic component of the current density in an inhomogeneous plasma in the presence of a magnetic field has been studied analytically; the results have been used in studying the nonlinear growth of the second harmonic of an electromagnetic wave in an inhomogeneous magnetoplasma and on reflection from an inhomogeneous magnetoplasma-free space interface when the electromagnetic wave is propagating along the direction of the external magnetic field. Some numerical results depicting the phenomenon of resonances in the second harmonic component of current density and in the second harmonic components of the reflected wave have also been presented.View full abstractDownload PDF (940K) -
Mahendra S. Sodha, Predhiman K. Kaw1966 Volume 21 Issue 12 Pages 2684-2694
Published: December 05, 1966
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA new mechanism for the generation of even harmonics and sum and difference frequencies in a plasma, which consists of simultaneous application of a d.c. electric field and two alternating electric fields, has been analysed. The Boltzmann transfer equation for electrons in a homogeneous plasma in the presence of a d.c. electric field and two a.c. electric fields has been solved, and explicit expressions for the harmonic and combination frequency components of current density have been obtained. These expressions have been substituted in the general wave equation and the solution has been used to investigate two specific phenomena viz. the nonlinear growth of the second harmonic and sum and difference frequency waves in a plasma, and the magnitude of these frequency components in the wave reflected from a plasma-free space interface when the two incident electromagnetic waves are both travelling perpendicular to the direction of the externally applied d.c. electric field. A short discussion of the results is also given.View full abstractDownload PDF (1212K) -
Susumu Saito, Noriyoshi Sato, Yoshisuke Hatta1966 Volume 21 Issue 12 Pages 2695-2703
Published: December 05, 1966
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIn a hot cathode discharge tube with a coaxial electrode configuration, low frequency oscillations (300 c/s to 30 kc/s) propagating in the direction of E×B0 (E and B0 are a radial electric and an axial magnetic fields, respectively) are observed when B0 exceeds a critical value correspounding to the condition ωceτen≈O(1) and the magnetic field has no effect on ions. The experimental results agree with the results of the analysis based on the two-fluid model in which the effect of the collisions between charged and neutral particles is taken into account. Oscillations are excited by an azimuthal relative velocity between electrons and ions. When the plasma is uniform, the waves are ion acoustic waves. When the plasma is non-uniform, the wave frequencies are determined by the drift velocity and the ratio of the electron to ion mobilities, if the collision frequency is higher than the oscillation frequency.View full abstractDownload PDF (1040K) -
Takaya Kawabe1966 Volume 21 Issue 12 Pages 2704-2709
Published: December 05, 1966
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSFine structures of electron plasma oscillations have been observed using mercury vapor discharge tubes. These fine structures are explained by the dispersion relation for longitudinal oscillations of the electron beam-plasma system. Wave-wave coupling phenomena and a parametric mechanism in a plasma are also found in the generation of higher harmonics of the electron plasma oscillations.View full abstractDownload PDF (752K) -
P. Govinda Reddy1966 Volume 21 Issue 12 Pages 2710-2715
Published: December 05, 1966
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe influence of transverse magnetic field on the laminar radial flow of an incompressible fluid between two closely spaced parallel plates has been analysed. The governing equations and boundary conditions are established, and a solution is obtained by perturbing the creeping-flow solution and making use of asymptotic expansion. The extent of the effect of magnetic field on the flow is determined by the magnitude of the Hartmann number, M. Numerical results for the pressure distribution are presented graphically. When M=0, the solution reduces to that obtained by Savage.View full abstractDownload PDF (536K) -
Purushottam Lal Sachdev, Phoolan Prasad1966 Volume 21 Issue 12 Pages 2715-2724
Published: December 05, 1966
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA method for automatically taking into account the shock discontinuities in the flow problems whenever and wherever they occur was given by Von Neumann and Richtmyer by introducing an artificial viscosity term in the momentum and energy equations. In this paper, an alternative mechanism of artificial heat conduction is proposed. This alters only the energy equation and satisfies all conditions, namely (i) the altered equations possess a continuous solution, (ii) the thickness of the shook is everywhere of the same order of interval length Δx, used in the numerical computation and is independent of the shock strength and the properties of the undisturbed medium, (iii) the dissipative mechanism is effective only in the shock layer and (iv) the Rankine-Hugoniot conditions hold when all the dimensions characterising the flow are large compared to shock thickness, as does artificial viscosity term. The stability conditions of the differential equations and the difference equations are almost the same. Numerical results for one dimensional piston problem with the piston moving with a constant speed, show excellent agreement with the exact solution.View full abstractDownload PDF (1008K) -
K. Kameswara Rao, C. R. K. Murty1966 Volume 21 Issue 12 Pages 2725
Published: December 05, 1966
Released on J-STAGE: May 29, 2007
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Toshio Takada, Yoshichika Bando, Masao Kiyama, Hiroki Miyamoto, Tsuyos ...1966 Volume 21 Issue 12 Pages 2726
Published: December 05, 1966
Released on J-STAGE: May 29, 2007
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Tetsuhiko Okamoto, Nobuo Iwata, Shoji Ishida, Eiji Tatsumoto1966 Volume 21 Issue 12 Pages 2727
Published: December 05, 1966
Released on J-STAGE: May 29, 2007
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Takashi Sambongi, Isao Maeda1966 Volume 21 Issue 12 Pages 2728
Published: December 05, 1966
Released on J-STAGE: May 29, 2007
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Hiroshi Fujiwara, Tetsuji Iwasaki, Toshihiko Tokunaga, Eiji Tatsumoto1966 Volume 21 Issue 12 Pages 2729
Published: December 05, 1966
Released on J-STAGE: June 01, 2007
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Takahiko Kamigaichi, Tetsuhiko Okamoto, Nobuo Iwata, Eiji Tatsumoto1966 Volume 21 Issue 12 Pages 2730
Published: December 05, 1966
Released on J-STAGE: May 29, 2007
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Yasushi Terumichi, Tsutomu Ikemura, Shigetoshi Tanaka, Isao Takahashi1966 Volume 21 Issue 12 Pages 2731
Published: December 05, 1966
Released on J-STAGE: May 29, 2007
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Yoshihiro Kino, Syôhei Miyahara1966 Volume 21 Issue 12 Pages 2732
Published: December 05, 1966
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Takashi Inamura, Iwao Takemoto, Seizaburo Kageyama1966 Volume 21 Issue 12 Pages 2733
Published: December 05, 1966
Released on J-STAGE: May 29, 2007
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Gen Matsumoto, Shuichi Iida1966 Volume 21 Issue 12 Pages 2734
Published: December 05, 1966
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Haruhiko Suzuki, Syôhei Miyahara1966 Volume 21 Issue 12 Pages 2735
Published: December 05, 1966
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Ryumyo Onaka1966 Volume 21 Issue 12 Pages 2736
Published: December 05, 1966
Released on J-STAGE: May 29, 2007
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M. Miler1966 Volume 21 Issue 12 Pages 2737
Published: December 05, 1966
Released on J-STAGE: May 29, 2007
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Kunio Fujiwara, Osamu Sueoka, Toru Imura1966 Volume 21 Issue 12 Pages 2738-2739
Published: December 05, 1966
Released on J-STAGE: May 29, 2007
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Tunetaro Sakudo, Hiromi Unoki, Yoshimasa Fujii1966 Volume 21 Issue 12 Pages 2739
Published: December 05, 1966
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Kohji Ohbayashi, Kay Kohn, Shuichi Iida1966 Volume 21 Issue 12 Pages 2740-2741
Published: December 05, 1966
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Tadayoshi Yamashita, Kouzou Ojima, Youji Taneda1966 Volume 21 Issue 12 Pages 2741
Published: December 05, 1966
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V. Hovi, Ulla Järvinen, P. Pyykkö1966 Volume 21 Issue 12 Pages 2742-2743
Published: December 05, 1966
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R. B. Lal, G. M. Arnett1966 Volume 21 Issue 12 Pages 2743-2744
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Shinji Kawano, Koji Kosuge, Sukeji Kachi1966 Volume 21 Issue 12 Pages 2744-2745
Published: December 05, 1966
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Toshio Takada, Yoshichika Bando, Masao Kiyama, Hiroki Miyamoto, Tsuyos ...1966 Volume 21 Issue 12 Pages 2745-2746
Published: December 05, 1966
Released on J-STAGE: June 01, 2007
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