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排序方式: 共有233条查询结果,搜索用时 15 毫秒
1.
Akihisa Inoue 《Progress in Materials Science》1998,43(5):365-520
2.
3.
Akihisa Inoue Nobuyoshi Yano Kunio Matsuzaki Tsuyoshi Masumoto 《Journal of Materials Science》1987,22(5):1827-1834
Copper-based superconducting alloys including finely dispersed f c c lead or h c p (Pb- Bi) particles in f c c copper matrix have been obtained by rapid quenching (Cu-M)100-x
Pbx and (Cu-M)100-x
(Pb0.6Bi0.4
x
(M = aluminium, silicon or tin;x < 10 at%) alloys containing immiscible elements such as lead and bismuth. The particle size and interparticle distance were about 30 to 130 nm and 20 to 200 nm for had particles and about 30 to 60 nm and 30 to 150 nm for (Pb- Bi) particles. The transition temperature,T
c, was in the range of 3.2 to 5.5 K for the Cu-M-Pb alloys and 6.2 to 6.3 K for the Cu-M-Pb-Bi alloys. Critical magnetic field,H
c2, and critical current density,J
c, for the later alloys were 0.47 to 0.93T at 4.2 K and 1.1 × 105 to 2.7 × 105 Am–2 at zero applied field and 4.21 K. The mechanism of the appearance of such a soft-type superconductivity for the rapidly quenched copper-based alloys was discussed, and inferred to be due to the formation of a percolation path of a superconducting lead or Pb-Bi phase along the grain boundaries, sub-boundaries and/or tangled dislocations where the lead or Pb-Bi phase precipitated preferentially, rather than the proximity effect based on lead or Pb-Bi particles. 相似文献
4.
Eighteen sterols were isolated from the aerial parts ofKalanchoe pinnata (Crassulaceae) including four novel sterols,viz. (24R)-stigmasta-5,25-dien-3β-ol (24-epiclerosterol), (24R)-5α-stigmasta-7,25-dien-3β-ol, 5α-stigmast-24-en-3β-ol, and 25-methyl-5α-ergost-24(28)-en-3β-ol. 24-Epiclerosterol and its
Δ7-analog occur together with their 24S/β-epimers in the same plant making this the first report of the isolation of both C-24 epimers of Δ25-unsaturated 24-alkylsterols from a non-marine organism. Iodine-catalyzed isomerization of stigmasta-5,24-dien-3β-ol (24-ethyldesmosterol),
the main sterol ofK. pinnata, yielded 24-epiclerosterol among other products. 相似文献
5.
Akihisa Inoue 《北京科技大学学报(英文版)》2010,17(2):208-213
The unusual glass-forming ability(GFA) of the Zr_(48)Cu_(36)Ag_8Al_8 alloy and the high ductility of the Zr_(48)Cu_(36)Ag_8Al_8 metallic glass-matrix composites containing Ta powder were reported.The bulk metallic glass rod with a diameter of 25 mm was successfully synthesized using copper mold casting for the Zr_(48)Cu_(36)Ag_8Al_8 alloy.High GFA of this alloy was found to be related to a large supercooled liquid region and a quaternary eutectic point with low melting temperature.The bulk metallic glass... 相似文献
6.
Toshiji Mukai T. G. Nieh Yoshihito Kawamura Akihisa Inoue Kenji Higashi 《Intermetallics》2002,10(11-12)
Mechanical deformation of Pd40Ni40P20 was characterized in compression over a wide strain rate range (3.3×10−5 to 2×103 s−1) at room temperature. The compression sample fractured with a shear plane inclined 42 degree with respect to the loading axis, in contrast to 56 degree for the case of tension. This suggests the yielding of the material deviates from the classical von Mises yield criterion, but follows the Mohr-Coulomb yield criterion. Fracture stress as well as strain was found to decrease with increasing applied strain rate. The compressive stress (1.74 GPa) was also found to be higher than the tensile fracture stress at a quasi-static strain rate. Close examination of the stress–strain curves revealed that localized shear might have occurred at a compressive stress of about 1.4 GPa, much lower than the “apparent” yield stress of 1.74 GPa. However, the stress of 1.4 GPa for shear band initiation is almost the same as the fracture stress measured at a dynamic strain rate of 5×102 s−1. These results suggested that the fracture of a bulk metallic glass is sensitive to the applied loading rate. 相似文献
7.
Yu. Z. Kovdrya V. N. Nikolaenko Hideki Yayama Akihisa Tomokiyo O. I. Kirichek I. B. Berkutov 《Journal of Low Temperature Physics》1998,110(1-2):191-198
The properties of a quasi-one-dimensional (Q1D) electron system on liquid helium are considered and the experiments on the carrier transport are presented. It has been shown that the electron mobility changes from high values close to that for bulk helium to very small values as a function of the Q1D channel width. Such a behaviour of is connected to a gradual transition from the regime of the quasi-free movement of the carriers in a Q1D system to the conditions of strong localization of the electrons. In the last case depends on temperature exponentially with the activation energy of a few degrees.
It is predicted that in Q1D channels in regime of the localization two optical plasmon branches can exist. One of them (a high frequency branch) is connected with the oscillations of electrons in potential wells and another one has lower frequency and is due to the oscillations of dimples, which are created by localized electrons on the liquid helium surface, in the potential wells.
Possible new experiments on study of magnetotransport, plasma oscillations and phase diagram of ordered-disordered states in a Q1D electron system of a finite length over liquid helium are proposed and discussed. 相似文献
8.
The simultaneous addition of Al and Ag to Zr–Cu binary alloys increased in the stabilization of supercooled liquid, the reduced glass transition temperature and γ value, leading to greatly enhance the glass-forming ability (GFA). The Zr–Cu–Ag–Al glassy alloy samples with diameters above 15 mm were obtained in the wide composition range of 42–50 at% Zr, 32–42 at% Cu, 5–10 at% Ag, and 5–12 at% Al. The best GFA was obtained for Zr48Cu36Ag8Al8 alloy, and the glassy samples with diameters up to 25 mm were fabricated by an injection copper mold casting. The Zr48Cu36Ag8Al8 glassy alloy exhibited high tensile and compressive fracture strength of over 1800 MPa. 相似文献
9.
Yasuhito Takahashi Shinji Wakao Koji Fujiwara Hiroyuki Kaimori Akihisa Kameari 《Electrical Engineering in Japan》2010,170(1):26-35
This paper describes a benchmark model proposed for the clarification of the characteristic of various methods for modeling the laminated iron core. In order to obtain a reference solution of the benchmark model, a large‐scale nonlinear magnetostatic field analysis with a mesh fine enough to represent the microscopic structure of the laminated iron core is carried out by using the hybrid finite element–boundary element (FE‐BE) method combined with the fast multipole method (FMM) based on diagonal forms for translation operators. The computational costs and accuracy of two kinds of homogenization methods are discussed, comparing them with the reference solution. As a consequence, it is verified that the homogenization methods can analyze magnetic fields in laminated iron core within acceptable computational costs. © 2009 Wiley Periodicals, Inc. Electr Eng Jpn, 170(1): 26–35, 2010; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20809 相似文献
10.
Yoshihiko Yokoyama D. Gary Harlow Peter K. Liaw Akihisa Inoue 《Metallurgical and Materials Transactions A》2010,41(7):1780-1786
High fatigue strength is one of the important factors that facilitates the industrial usage of bulk metallic glasses (BMGs).
Fatigue data were analyzed using the Weibull probability models for BMGs produced with different casting processes in order
to study the reliability of fatigue strengths of cast glassy alloys. The fatigue data of tilt-cast and high-pressure-cast
BMGs can be explained by a three-parameter Weibull cumulative distribution function (cdf) and a mixture model of two-parameter
Weibull cdfs, respectively. We conclude that the cast defects, which reduce fatigue strength, should be eliminated in order
to realize a high reliability of fatigue strengths. 相似文献