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Volume 11, Issue 12
Displaying 1-18 of 18 articles from this issue
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Kiichi Kimura, Isao Kumabe, Kozo Miyake, Hiroshi Ogata, Kyoichi Miyasi ...1956 Volume 11 Issue 12 Pages 1211-1220
Published: December 05, 1956
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSUsing an ionization chamber filled with oxygen, the O16(n, α)C13 reaction has been observed.
The chamber was irradiated with moderated Li-D fast neutrons with continuous energy spectrum, and the output pulses produced by the reaction were registered and the pulse height distribution was determined. We obtained eighteen resonances corresponding to the excited levels of O17 at (9.66), (9.45), (9.21), 9.07, 8.90, 8.75, 8.52, (8.41), 8.27, 8.06, 7.93, 7.75, (7.57), (7.39), (7.28), (7.16), (7.09) and 6.89 Mev.View full abstractDownload PDF (1296K) -
Jun-ichi Hori1956 Volume 11 Issue 12 Pages 1220-1227
Published: December 05, 1956
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIt is first shown that, for some special simple impedances, the stochastic equation describing the fluctuation of macroscopic variables, which is suggested by the fluctuation-dissipation theorem, comes out to be equivalent to the Langevin equation appearing in ordinary irreversible thermodynamics. This does not mean, however, that the ordinary irreversible thermodynamics cannot describe any variables other than those with the simple impedances. It is secondly shown that, on the contrary, any macroscopic variable whose impedance is of the form
Z(iω)=z−1⁄(iω)+z0+(iω)z1+∑jcj⁄(iω−pj),
can be described within the framework of the ordinary irreversible thermodynamics. This is proved by the fact that we can construct, starting from irreversible-thermodynamical equations and using the method of eliminating inner variables, a variable whose impedance is of the above-mentioned form and whose fluctuation-spectrum exactly coincides with that given by the fluctuation-dissipation theorem.View full abstractDownload PDF (964K) -
Sukeaki Hosoya, Seiya Satake, Satio Takagi1956 Volume 11 Issue 12 Pages 1228-1231
Published: December 05, 1956
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSIonic crystals can be plastically bent under water to a great extent. This phenomenon has been known as Joffé effect, the mechanism being not fully elucidated. In the present work the X-ray diffraction method and etch pit techniques have been used in order to investigate the arrangement of crystallites in the bent and annealed rock salt. Both results show, with good correspondence, that the crystal consists of many polygonized crystallites which have the form like letter L, with small angle boundaries between the neighbours. The mean thickness of these crystallites was about 0.02∼0.03 mm, when the radius of curvature of bending was about 20 mm.View full abstractDownload PDF (736K) -
Sukeaki Hosoya1956 Volume 11 Issue 12 Pages 1231-1236
Published: December 05, 1956
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSColour centre colloids have been used to visualize the dislocation networks in ionic crystals. The polygonization boundaries inside the crystal are also clearly seen by the decoration effect of the colloids. It has been found that these boundaries are usually L-letter-shaped in the strongly bent and annealed crystals. This polygonized structure is well corresponding to the results derived from etch pits and X-ray diffraction.
Polygonized boundaries were found to appear in the direction perpendicular to the glide planes when the crystal is annealed at 600°C or higher.View full abstractDownload PDF (2180K) -
Shozo Sawada1956 Volume 11 Issue 12 Pages 1237-1246
Published: December 05, 1956
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThermal and electrical properties of tungsten oxide were observed in a wide range of temperature. An entirely new anomaly was found at 1230°C, where the rate of sublimation increased abruptly. The amounts of anomalous heat were found to be 330, 450, 280 and 120 cal/mol at the 330°C, 740°C, 910°C and 1230°C transitions respectively, the entropy change being 0.55, 0.45, 0.23 and 0.08 cal/mol·deg at each of the transition temperatures. Any anomalous heat larger than 6 cal/mol was not observed near the −20°C transition point. At the mentioned transition points the anomalies of electrical properties were observed. The d.c. resistance decreases, on heating from room temperature, like a typical semiconductor with the activation energies of nearly 2.2, 0.3, 1.7 and 1.3 eV below 740°C, between 740°C and 910°C, between 910°C and 1230°C and above 1230°C, respectively, the small value as 0.3 eV between 740°C and 910°C being especially noticeable. A non-linearly of I-V relation was observed, indicating some anomalous electrical property of this substance.View full abstractDownload PDF (1136K) -
Shozo Sawada1956 Volume 11 Issue 12 Pages 1246-1252
Published: December 05, 1956
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe domain structure of single crystals of tungsten oxide was observed between −130°C and 1200°C. An abrupt change of domain structure was observed at −50°C on cooling and it varied only gradually on heating, as reported (previously). No change was observed at the 910°C transition. The crystal structure was investigated in detail near 910°C. and 1230°C respectively. No change of crystal symmetry except for only slight anomalies of lattice constants was observed at these two transitions. Ferroelectricity or antiferroelectricity and bond structure of this substance were discussed using the result of observations, and it was stressed that these would be in an intimate relation with each other.View full abstractDownload PDF (900K) -
Shuichiro Takahashi1956 Volume 11 Issue 12 Pages 1253-1261
Published: December 05, 1956
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe effects of strain amplitude on the internal friction and the Young’s modulus of polycrystalline specimens of copper alloys (Cu–Zn, Cu–Al, Cu–P) with various concentrations of solute atoms have been investigated.
The results are:
1. The critical stress, up to which the internal friction and the Young’s modulus are almost independent of strain amplitude, increases with concentration of solute atoms, showing a considerable harmony with the theoretical stress obtained by Mott.
2. The strain-independent part of the internal friction decreases as a power function of concentration of solute atoms, although its numerical value depends largely on the pre-treatment.
3. The strain-dependent part of the internal friction and the fractional change of Young’s modulus are represented by two parallel fomulae, as in the theory of Nowick. But the factors of strain-dependencies seem to increase with concentration of solute atoms.
4. The internal friction and the Young’s modulus are both almost independent of frequency in the range between 900 and 10,000 cps at at room temperatures.View full abstractDownload PDF (904K) -
Eiko Aihara, Kazuo Niira1956 Volume 11 Issue 12 Pages 1261-1264
Published: December 05, 1956
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe electronic energies of π-electron system in benzene molecule have been calculated by the bond orbital (BO) method for singlet states. Configuration interactions (CI) have not been taken into account. All the levels other than 1B2u and 1E2g calculated by the present method are higher than the levels calculated by the MO method without CI. In the MO method, however, the order of levels is changed and coincides with the observed order, by including CI. In the BO method the order of levels would not be changed by including CI, since the BO method without CI already gives the correct order.View full abstractDownload PDF (296K) -
Toshizo Nakaya1956 Volume 11 Issue 12 Pages 1264-1284
Published: December 05, 1956
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIt has been discovered by the author that a faint illumination of ultra-violet ray or a visible light from a light source thrown on the discharge space of low pressure A-Hg discharge tubes increases the starting potential to a remarkable extent. This effect only takes place when there exist relatively high wall temperature of 40∼90°C (i.e. high density of Hg atoms) and relatively high pressure of argon gas (a few mm Hg). When the intensity of illumination exceeds a certain value, the starting potential shows a somewhat saturated constant voltage. This effect is sensitive to radiations of any wave-length widely ranging from ultra-violent to visible light. An addition of a small quantity of H2 gas suppresses this effect. The part of the tube that is sensitive to radiation is found on the anode side. According to the hypothesis by the author, under such condition that both the pressure of A gas and the density of Hg atoms are adequate, there seems to exist a region where metastable molecules of mercury are indispensable for starting a glow discharge as a principal source of ions. In the strength of the assumptions based on the hypothesis by the author, most of the experimental results can be explained fairly well.View full abstractDownload PDF (3000K) -
Itiro Tani, Hiroshi Sato1956 Volume 11 Issue 12 Pages 1284-1291
Published: December 05, 1956
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSMeasurements were made on the boundary layer along a flat plate in a two-dimensional low turbulence wind tunnel. A fine rod was attached to the plate as a two-dimensional roughness element, and the resulting transition from laminar to turbulent flow was investigated by hot-wire equipment.
The transition was found to differ in marked contrast according as the height of roughness element k is small or large as compared with the thickness of boundary layer δk at the element. When k⁄δk is small, the boundary-layer flow separates at the element, but reattaches to the plate at some distance producing scarcely any disturbance. Transition occurs in the reattached boundary layer. A sinusoidal velocity fluctuation, characteristic of the laminar-boundary-layer oscillation, is observed at a distance downstream from the roughness element. When k⁄δk is large, transition occurs in the separated layer before it reattaches to the plate. Within the separated layer, a sinusoidal fluctuation is observed having the frequency pertinent to the separated layer from a sharp corner.
For a given roughness element at a given position on the plate, the transition moves forward and the transition Reynolds number continues to decrease as the free-stream velocity is increased. At a certain value of k⁄δk the transition reaches the element, and the transition Reynolds number begins to increase as the free-stream velocity is further increased. The minimum of the transition Reynolds number was found to correspond approximately to the demarcation of the two types of transition mentioned above.View full abstractDownload PDF (1236K) -
Yoshio Yasuoka1956 Volume 11 Issue 12 Pages 1292-1295
Published: December 05, 1956
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIn the previous paper, the author investigated the cathode back heating power and the anode dark current in a coaxial diode acted on by a magnetic field. The present paper gives a more advanced treatment, taking into account the effect of the magnetic field on the scattered electrons. As a result, values have been obtained which is much nearer to the experimental values and the agreement is considered satisfactory.View full abstractDownload PDF (408K) -
Syohei Miyahara, Haruyuki Ohnishi1956 Volume 11 Issue 12 Pages 1296-1297
Published: December 05, 1956
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (164K) -
S. Ibuki, K. Awazu1956 Volume 11 Issue 12 Pages 1297
Published: December 05, 1956
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (272K) -
Etsuro Sawaguchi, Takeshi Mitsuma, Zensho Ishii1956 Volume 11 Issue 12 Pages 1298
Published: December 05, 1956
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (176K) -
Yoshio Inuishi1956 Volume 11 Issue 12 Pages 1299
Published: December 05, 1956
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (152K) -
Sh\={u}ichi Iida1956 Volume 11 Issue 12 Pages 1300-1301
Published: December 05, 1956
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (168K) -
Eiichi Fukada1956 Volume 11 Issue 12 Pages 1301A
Published: December 05, 1956
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (84K) -
Kiyokata Matsuura, Yoshikazu Sugiura, G. M. Hatoyama1956 Volume 11 Issue 12 Pages 1301B
Published: December 05, 1956
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (64K)
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