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MASAKATSU SAEKI SHIN-ICHI OHNO ENZO TACHIKAWA NAOTO AZUMA TETSUO MIYAZAKI KENJI FUEKI 《Journal of the American Ceramic Society》1985,68(3):151-155
Behavior of deuterium atoms in fused silica, which were implanted by 80-keV D+ (D2 + , D3 + ) ions or doped thermally by D2 (or D2 O), was studied by infrared Fourier transform spectroscopy (FTIR) and by ESR spectroscopy. When 80-keV deuteron ions are implanted into fused silica, OD bonds are formed. The OD bonds are also formed by thermal doping with D2 or D2 O. When the deuterated silica is γ-ray irradiated at 77 K, D atoms are formed by rupture of the OD bonds. The efficiency of the OD bond rupture in the deuteron-implanted silica is much less than that in the D2 -doped silica. It is concluded from the results of thermal annealing that the low efficiency of the OD bond rupture in the deuteron-implanted silica is due to the radiation damage accompanying the implantation process. However, the decay rate and detrapping energy of deuterium atoms, once formed in the silica, are similar in both cases. 相似文献
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TSUGIO HAMADA YOSHIHISA OHZONO TADAHIRO AKUNE NOBUYOSHI SAKAMOTO 《Journal of Materials Science》1997,32(13):3469-3473
The critical current density, Jc, in fluorine-doped YBa2Cu3Ox bulk superconductors has been measured at several temperatures. The measured Jc value is 108 A m-2 at 77 K and 0.5 T. A sample with a larger critical current density can be produced by the addition of a small amount of platinum during the sintering process. The added platinum has the effect of evenly distributing Y2BaCuO5 particles and voids in the matrix in comparison with the undoped sample. These distributions of Y2BaCuO5 particles and voids are reflected in an increase in the critical current density. However, these distributions are not directly related to the observed peak effect in the critical current density. If the fluorine-doped YBa2Cu3Ox superconductor consists of the matrix and a phase with a Ginzburg–Landau parameter, that is slightly different from that of the matrix, then the occurrence of the peak effect can be explained. 相似文献
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QIU-SHENG LIU KATSUHISA OHNO HIROTAKA NAKAYAMA 《International journal of systems science》2013,44(6):903-914
A multi-objective discounted Markov decision process (MDP) with expectation and variance criteria is discussed. First, difficulties in variance minimization are discussed and it is shown that variance minimization is much more difficult than the expectation optimization. Then, the multi-objective MDP with expectation and variance criteria is formulated as a multi-objective non-linear programming problem. An algorithm for finding a stationary satisfactory Pareto policy is proposed by applying the satisficing trade-off method of Nakayama. In the proposed algorithm, a decision-maker need not have a high degree of judgment and it is easy to take the balance of expectation and variance criteria and furthermore, the number of auxiliary optimization problems to be solved is quite small. Numerical examples show the efficiency of the proposed algorithm. 相似文献
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Moisture sorption characteristics of kudzu starch and sweet potato starch were investigated based on the results of moisture sorption isotherms at 11°C, 20°C and 30°C, thermal analysis, isosteric heat of sorption and entropy of sorption. The water of crystallization in sweet potato starch was strongly retained compared with that in kudzu starch. Differences in amount of moisture sorbed between kudzu starch and sweet potato starch seemed to be attributable to the stability of the microscopic structure. The interaction of moisture-sweet potato starch was stronger than that of moisture-kudzu starch. Amount of moisture sorbed and strength of moisture-starch binding of the starches, preheated to 110°C, decreased compared with those of the starches vacuum-dried at 20°C because of release of water from the amorphous part of the starch granule. 相似文献
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The effects of filtering through bleaching media on decrease of peroxide value (PV) of autoxidized soybean oil were investigated to improve its quality. Sixteen kinds of filtering and bleaching media were employed. The standard activated clay was the most effective in decreasing the peroxides in autoxidized soybean oil. The relations between the decrease of PV and the physical or the chemical properties of the media were examined. It was found that peroxides are reduced in proportion to the amount of acid at the highest acid strength range + 1.5–5.6 rather than amount of acid at the lower acid strength range, total amount of acid or specific surface area of medium. 相似文献
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Miyuki YAJIMA Masato YAMAGIWA Shin KAJITA Noriyasu OHNO Masayuki TOKITANI Arimichi TAKAYAM Seiki SAITO Atsushi M. ITO Hiroaki NAKAMURA Naoaki YOSHIDA 《等离子体科学和技术》2013,15(3):282-286
Tungsten was exposed to pure Ar or Ne plasmas over 1550 K at several incident ion energies. Even under the irradiation condition that the tungsten nanostructure is formed by He plasma irradiation, holes/bubbles and fiberform nanostructures were not formed on the surface by exposure to Ar or Ne plasmas. In addition, the results from energy dispersive X-ray spectroscopy supported the facts that Ar and Ne did not remain in the sample. We will discuss the reason for the diferences in the damage to the tungsten surface exposed to noble gas plasmas. 相似文献
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AKIRA KOHARA KATSUHIRO HIRATA NOBORU NIGUCHI YUKI OHNO 《Electrical Engineering in Japan》2017,200(3):52-60
This paper proposes a novel variable flux reluctance motor without dc‐field coils. The stator of this motor has only armature coils. The proposed motor can control the torque‐speed characteristics by increasing or decreasing the field voltage that is superimposed on the armature currents. In this paper, the operational principle of the motor is described, and the N–T characteristics are computed by finite element analysis under vector control. In addition, the N–T characteristics are compared with a conventional variable flux reluctance machine with armature and dc‐field coils. 相似文献
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Charge and Discharge Control to Save Regeneration Energy for Overhead Line and Energy Storage Device Hybrid Power Source Three‐Level Inverter 下载免费PDF全文
YUKO ASANO YOSHIKI OHNO SOICHIRO KURITA KEIICHIRO KONDO TAKESHI SHINOMIYA KATSUMI ISHIKAWA 《Electrical Engineering in Japan》2018,202(4):41-49
Hybrid power source three‐level inverter is proposed as a main circuit system with energy storage device for increasing regenerative power. This paper proposes a charge and discharge control method to utilize the regenerated energy. The proposed method is verified by experimental tests with a scaled‐down model and numerical simulation. 相似文献