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    • 4. 发明授权
    • Superconductors having continuous ceramic and elemental metal matrices
    • 具有连续陶瓷和元素金属基体的超导体
    • US5470821A
    • 1995-11-28
    • US389544
    • 1995-02-15
    • Kai W. WongXin FeiYing XinYi-Han Kao
    • Kai W. WongXin FeiYing XinYi-Han Kao
    • C22C1/05C22C29/12H01L39/12H01B12/00
    • C22C1/051C22C29/12H01L39/126Y10S505/783Y10S505/785Y10T428/12021Y10T428/12063Y10T428/24545
    • Composite bulk superconducting materials having desirable physical, measured transport current density and high T.sub.c superconducting characteristics are provided which comprise a first matrix of superconducting ceramic oxide crystalline grains with a second matrix of elemental metal (gold, silver, palladium and tin) situated within the interstices between the crystalline grains. Preferably, each matrix is a continuous phase within the composite material, with the ceramic oxide preferably being present at a level of at least about 80% by weight, whereas the elemental metal is present at a level of up to about 20% by weight. In fabrication procedures, a precursor superconducting ceramic oxide is first prepared and reduced to a fine powder size; this is mixed with powdered elemental metal, and the mixture is compressed using high compaction pressures on the order of 14 tons/cm.sup.2 or greater to form a body, which is then sintered to yield the composite. Particularly preferred composites include a mixed metallic matrix including respective quantities of tin and a noble metal.
    • 提供具有期望的物理,测量的传输电流密度和高Tc超导特性的复合体超导材料,其包括位于空隙内的元素金属(金,银,钯和锡)的第二基质的超导陶瓷氧化物晶粒的第一基体 晶粒之间。 优选地,每个基质是复合材料内的连续相,其中陶瓷氧化物优选以至少约80重量%的水平存在,而元素金属以至多约20重量%的水平存在。 在制造方法中,首先制备前体超导陶瓷氧化物并将其还原成细粉末尺寸; 将其与粉状元素金属混合,并使用约14吨/ cm 2以上的高压实压力压制混合物以形成主体,然后将其烧结以产生复合材料。 特别优选的复合材料包括包含各种量的锡和贵金属的混合金属基体。
    • 5. 发明授权
    • Selectively switchable superconducting electromagnetic shield
    • 选择性切换超导电磁屏蔽
    • US5329165A
    • 1994-07-12
    • US887859
    • 1992-05-26
    • Yi-Han KaoKai W. Wong
    • Yi-Han KaoKai W. Wong
    • H05K9/00H01F7/00
    • H05K9/0077
    • A selectively controllable, direction-, amplitude- and/or frequency-specific superconducting shield (10) is provided which includes a multiply-connected superconducting shield (12) adapted to shield a zone (13) from external magnetic, electric and/or electromagnetic fields and signals. Controlled gating of the shield (12) is provided by means (16) serving to selectively lower the critical shielding current density of a portion (26) of the shield (12) to a level permitting entrance of external fields through the portion (26), while leaving the critical shielding current densities of other portions of the shield (12) at higher, field-shielding levels. The means (16) preferably includes respective, selectively energizable coil pairs (CP.sub.1, CP.sub.2 . . . CP.sub.n) disposed about the shield (12). A highly sensitive magnetic detector (30) would include the shielding device (10) as well as a SQUID assembly (18) situated within the zone (13) defined by shield (12). The detectors of the invention may be used in passive, gating-controlled arrays in order to improve signal discrimination and signal-to-noise characteristics of conventional arrays.
    • 提供了一种选择性可控,方向,幅度和/或频率特定的超导屏蔽(10),其包括适于屏蔽区域(13)与外部磁性,电气和/或电磁(12)的多重连接的超导屏蔽(12) 领域和信号。 屏蔽件(12)的受控栅极由用于选择性地将屏蔽件(12)的部分(26)的临界屏蔽电流密度降低到允许外部场通过部分(26)的水平的装置(16)提供, 同时将屏蔽件(12)的其它部分的临界屏蔽电流密度保持在更高的场屏蔽电平。 装置(16)优选地包括围绕屏蔽件(12)设置的相应的选择性激励的线圈对(CP1,CP2 ... CPn)。 高灵敏度磁检测器(30)将包括屏蔽装置(10)以及位于由屏蔽件(12)限定的区域(13)内的SQUID组件(18)。 本发明的检测器可以用于无源门控控制阵列,以便改进常规阵列的信号鉴别和信噪比特性。