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高温超导约瑟夫森结技术近年来发展很快,特别是台阶结、双晶结、双外延结、边缘结和邻近效应结等性能已达到实用水平,并应用于超导量子干涉器件、数字信号处理和高频有源器件中。文章介绍了这些结的技术和有关的应用。 相似文献
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高温超导约瑟夫森结技术近年来发展很快,特别是台阶结、双晶结、双外延结、边缘结和邻近效应结等性能已达到实用水平,并应用于超导量子干涉器件、数字信号处理和高频有源器件中。文章介绍了这些结的技术和有关的应用。 相似文献
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An economical magnetocardiogram (MCG) system is built in our laboratory. It mainly consists of a MCG data acquisition stage equipped with two high-To superconducting quantum interference device (SQUID) magnetometers, a data processing stage with digital filtering and a one-layer μ-metal magnetically shielded room in conjunction with a high-Tc SQUID based active compensation. Experimental results show that a noise level of pico-tesla in MCG profiles, which is necessary for clinical applications, may be achieved with the system. Moreover, stable and convenient operations of the system are demonstrated with simulating MCG measurements. 相似文献
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Singular value decomposition with normalized period for magnetocaridiography signal processing 下载免费PDF全文
In this paper, we have developed an algorithm based on singular value
decomposition (SVD) for matrix. And the novel SVD algorithm with normalized
period of cardiac cycles is presented. The results from real
magnetocardiography (MCG) data processing show that the new algorithm is
better than the standard one not only in suppressing noises, but also in
providing high-fidelity MCG signals. 相似文献
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Considering the properties of slow change and quasi-periodicity of
magnetocardiography (MCG) signal, we use an integrated technique of adaptive
and low-pass filtering in dealing with two-channel MCG data measured by high
$T_{\rm c}$ SQUIDs. The adaptive filter in the time domain is based on a noise feedback
normalized least-mean-square (NLMS) algorithm, and the low-pass filter with
a cutoff at 100Hz in the frequency domain characterized by Gaussian functions is
combined with a notch at the power line frequency. In this way, both
relevant and irrelevant noises in original MCG data are largely eliminated.
The method may also be useful for other slowly varying quasi-periodical
signals. 相似文献
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Magnetic Field Dependence of the Critical Current of Bi2Sr2CaCu2O8+δ-Based Intrinsic Josephson Junctions 下载免费PDF全文
Well-characterized surface intrinsic Josephson junctions (IJJs) on Bi2Sr2CaCu2O8 δ single crystals are fabricated by in situ cryogenic cleavage of the crystals and immediate evaporation of A u films on the crystal surface. Magnetic field dependences of the critical currents of the surface and inner I33s are carefully measured. We find that the 相似文献