巻号一覧
5 巻, 9 号
選択された号の論文の10件中1～10を表示しています
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Kazumi IWAMOTO, Jun OISHI1968 年 5 巻 9 号 p. 437-446
発行日: 1968/09/25
公開日: 2008/04/18
ジャーナル フリーUsing tracer technique, studies were undertaken on the adsorption of iodine on natural graphite at temperatures ranging from 27° to 900°C under pressures from 0.03 to 1.4 mmHg, and on the desorption of adsorbed iodine from the same specimens into either vacuum or Ar stream. The specimens were heated up either isothermally, stepwise, or at constant rate of temperature rise, up to 1, 100°C. The resulting data accorded well with a theoretical treatment presuming desorption from heterogeneous surface, considering the desorption as an n-th order irreversible reaction having distributed activation energies. The iodine is considered to be held on the graphite by physical adsorption below about 450°C, and above that temperature, by chemisorption through bond formation between iodine and carbon atoms. The heat of adsorp-tion and the activation energy of desorption obtained was found to be a function of surface coverage. The presence of Ar gas was observed to inhibit chemisorption of iodine and to de-crease the activation energy of desorption of physically adsorbed iodine.抄録全体を表示PDF形式でダウンロード (756K) -
Makoto OBU, Toshihiro ICHIMORI1968 年 5 巻 9 号 p. 447-451
発行日: 1968/09/25
公開日: 2008/04/18
ジャーナル フリーAn experimental calibration of flux perturbation has been made with specially prepared neutron detecting foils producing only negligible perturbation in the thermal flux in a graphite medium. The foil material was composed of a 99.8% D2O solution of MnSO4. The manganese in the MnSO4 served as the activating substance. The detecting foils were so prepared as to possess a moderating ratio equal to that of the medium. The calibration was made near the matching point, with foils of various concentrations of manganese, ranging from 1.39 to 13.9 Mn-mg/cc.
The results of experiment indicated that the perturbation near the matching point was fairly insensitive to manganese concentration. The matching concentration was determined graphically.抄録全体を表示PDF形式でダウンロード (340K) -
Nobuhide SUDA, Tetsuo YAMAGUCHI, Yoshifumi SAKURAI1968 年 5 巻 9 号 p. 452-457
発行日: 1968/09/25
公開日: 2008/04/18
ジャーナル フリーA method of optimizing neutron flux distribution to obtain maximum power generation from a given core is presented. Constraining conditions governing maximum heat flux and control rod absorption are taken into consideration. It is shown that the problem is reduced to that of optimal control. In the case of one group model the phase plane technique is effective for an intuitive analysis of the problem. It is verified that the solution so obtained satisfies Pontry-agin's principle. The solution is one of "bang-pang type". The result is extended to the case of two group model, assuming that the solution will again be of bang-pang type. A comparison is made between the one group and the two group models.抄録全体を表示PDF形式でダウンロード (375K) -
Takashi NAKAMURA, Tomonori HYODO1968 年 5 巻 9 号 p. 458-463
発行日: 1968/09/25
公開日: 2008/04/18
ジャーナル フリーThe backscattering of γ-rays has been investigated from semi-infinite stratified slabs of alternating layers of tin and aluminum. The energy spectrum and the angular distribution of backscattered photons, as well as the number and energy albedos were obtained for 60Co and 137Cs point isotropic sources. They were compared with the data obtained with single layers of tin and aluminum. The stratified slabs of alternating layers were assumed in this study to be equivalent in property to a homogeneous mixture of tin and aluminum, and the effective atomic numbers were computed on this basis. The resulting values are found to agree with the effec-tive atomic numbers corresponding to the albedo values obtained for the alternating layers.抄録全体を表示PDF形式でダウンロード (412K) -
Mitsuyuki KITAZUME1968 年 5 巻 9 号 p. 464-471
発行日: 1968/09/25
公開日: 2008/04/18
ジャーナル フリーA simple formula for air-scattered γ-rays is proposed. The proposed formula is derived using a single-scattering approximation, with exponential attenuation and buildup factor for scattered γ-ray energy. The results of calculation obtained with the formula are compared with those by Monte Carlo method, and by single-scattering calculation without exponential attenua-tion and buildup, for line beams of mono-energetic γ-rays emitted from a point source.
For higher energies, the air-scattered flux and dose rate given by this simple approxima-tion agree fairly well with the Monte Carlo calculations at all beam angles and source-detector distances. The accuracy is within about 10%.
The flux and dose rate for γ-rays emitted isotropically from the point source have also been calculated, and are presented as a function of distance.抄録全体を表示PDF形式でダウンロード (405K) -
Takashi NAKAYAMA, Takahiko NISHIDA1968 年 5 巻 9 号 p. 472-475
発行日: 1968/09/25
公開日: 2008/04/18
ジャーナル フリーThe invariant imbedding equation for the absorption probability of slab has been derived from Roussopolos' variational functional. Numerical results obtained on the reflection function agreed well with that of Bellman, et al., and those on the absorption function also coincided with the Monte Carlo calculation.抄録全体を表示PDF形式でダウンロード (204K) -
Fully Developed Thermal SituationItaru MICHIYOSHI, Tsuyoshi NAKAJIMA1968 年 5 巻 9 号 p. 476-484
発行日: 1968/09/25
公開日: 2008/04/18
ジャーナル フリーThis paper deals with the problem of heat transfer in fully developed turbulent flow with uniform internal heat generation in a concentric annulus under conditions of uniform but different heat fluxes at the two wall surfaces. The Nusselt numbers at each wall surface are calculated by analyzing the radial distribution of the fluid temperature. We further derive approximate equations, which are found to represent very well the analytical results.
The Nusselt numbers vary with the ratios of the radii of annular space as well as of the wall heat fluxes, as also with internal that generation. These predictions agree well with avail-able experimental data for various fluids.抄録全体を表示PDF形式でダウンロード (536K) -
Kiyoko IMAI, Kazuo WATARI, Masami IZAWA1968 年 5 巻 9 号 p. 485-486
発行日: 1968/09/25
公開日: 2008/04/18
ジャーナル フリーPDF形式でダウンロード (151K) -
Ryosuke YOKOTA, Yuhei MUTO, Jiro NAOI, Shinji NISHIJIMA1968 年 5 巻 9 号 p. 486-487
発行日: 1968/09/25
公開日: 2008/04/18
ジャーナル フリーPDF形式でダウンロード (133K) -
1968 年 5 巻 9 号 p. 487
発行日: 1968年
公開日: 2008/04/18
ジャーナル フリーPDF形式でダウンロード (58K)
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