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An OmniGuide fiber consisting of superconductor–dielectric cladding periodic multilayers is investigated. The theoretical results of the OmniGuide fiber are presented and compared with that of multicore photonic crystal fiber and step-index fiber. The large mode area and low loss with small bending radius are observed by the OmniGuide fiber. 相似文献
33.
分别采用机械打磨去镍加热镀锡工艺和反电镀去镍加电刷镀银工艺制作一对接头,然后对接头进行低温直流测试,测得前者的直流电阻为1.98n-,后者的直流电阻为1.53n-。对比分析可知,反电镀去镍和电镀银工艺更有效、更简单。这些工艺研究对ITER校正场线圈超导接头的制作具有重要指导意义。 相似文献
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36.
Chemical and Physical Analysis of Acetate-Oxide Sol-Gel Processing Routes for the Y-Ba-Cu-O System 总被引:2,自引:0,他引:2
Tarek?MouganieEmail author Michelle?A.?Moram Joy?Sumner Bartek?A.?Glowacki Bart?Schoofs Isabel?Van?Driessche Serge?Hoste 《Journal of Sol-Gel Science and Technology》2005,36(1):87-94
The formation of three sols by fluorine-free aqueous and non-aqueous processes were analyzed and modified to vary the chemical properties of the sols (inks) to suit a variety of deposition processes such as dip-coating and ink-jet coating/printing. Ink-jet printing requires high wetting angles; choosing the right complexing agents to modify the ink allows the formation of droplets with high wetting angles on the surface. Dip-coating and ink-jet coating require low wetting angles; additives added to the sols reduce wetting angles to 10∘ and allow complete coverage of the substrate surface. The deposition theories and requirements are briefly discussed, as are some initial tests with the printing and converting of the developed superconducting inks. 相似文献
37.
Summary By use of an approximate band-structure treatment based on the EHMO approach, the energy band structures for the Zn-doped superconductor YBa2Cu3–x
Zn
x
O
y
were calculated in the present paper and the influence of partial substitution of zinc for copper on the electronic structures for orthorhombic YBa2Cu3Oy was studied. From analysis of the band structures and the densities of states for YBa2Cu3–x
Zn
x
O
y
, it was demonstrated that the 2D Cu-O planes in the Y-Ba-Cu-O superconducting system have a direct and dominant influence on superconductivity, whereas the role of the 1D Cu-O ribbons and the O(4) atoms is also of some importance. 相似文献
38.
Sunshine等在BiSrCaCuO体系掺入Pb~(2+)取代部分Bi,经较长时间灼烧后.获得T_(c(0))?110 K以2223相为主的样品,Hongbao等又报导了用Sb部分取代Bi(Pb)SrCaCuO体系中的Bi的研究结果.我们曾用Sb~(5+)、Sn~(4+)、W~(6+)、Mo~(6+)等高价离子部分取代Bi,研究这些离子对BiSrCaCuO体系成相的影响,发现掺高价离子后2223相易于生成并易于得到T_(c(0))?111K的超导体.本文则进一步探讨高价离子掺入的影响及其加速2223相生成的原因。 相似文献
39.
We present critical comments on the recent paper [Intikhab A. Ansari, Physica C: Superconductors, 470 (2010) 508] concerning numerical methods for solving Bloch–Gruneisen function and its applications to MgB2 superconductor. It is demonstrated that the presented in this work the formulas and examples are not original and they are quite identical the formulas already established in our article [B.A. Mamedov, I.M. Askerov, Physics Letters A, 362 (2007) 324]. 相似文献
40.
Tao Zou 《Journal of magnetism and magnetic materials》2010,322(1):169-172
We present experimental evidences for magnetization modification by superconductivity in a series of Nb/Ni80Fe20/Nb trilayers. By monitoring the magnetization in a zero field as a function of temperature, we observed an irreversibility in magnetization between the cooling and warming branches just above the superconducting transition temperature Tc. These results suggest that the magnetization of the ferromagnetic Ni80Fe20 layer is reduced by the mutual interactions between the ferromagnet and superconductor. Moreover, this effect diminishes with increasing thickness of the Ni80Fe20 layer, which indicates that the interaction between the superconducting and magnetic layers occurs mainly at the vicinity of the interfaces. 相似文献