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Magnetic field induced phase branches of the superconducting transition in two-dimensional square π-loop arrays 下载免费PDF全文
Based on the results of explicit forms of free energy density for
each possible arrangement of magnetization fluxes in large-scale
two-dimensional (2D) square $\pi $-loop arrays given by Li
\textit{et al} [2007 {\em Chin. Phys.} {\bf 16} 1450], the
field-cooled superconducting phase transition is further
investigated by analysing the free energy of the arrays with a
simplified symmetrical model. Our analytical result is exactly the
same as that obtained in Li's paper by means of numerical
calculations. It is shown that the phase transition splits into two
branches with either ferromagnetic or anti-ferromagnetic flux
ordering, which depends periodically on the strength of external
magnetic flux $\phi_{\e}$ through each loop and monotonically on the
screen parameter $\beta $ of the loops in the arrays. In principle,
the diagram of the phase branches is similar to that of its
one-dimensional counterpart. The influence of thermal fluctuation on
the flux ordering during the transition from normal to
superconducting states of the $\pi $-loop arrays is also discussed. 相似文献
2.
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
3.
We present a new filter scheme for magnetocardiogram (MCG) signal processing based on the quasi-periodic characteristic of the signals. The key points of this scheme are to determine the exact numbers of data points in each cardiac cycle by using electrocardiogram (ECG) data acquired simultaneously with the MCG signal and to normalize the MCG data sequence in each cycle into an identical length. Compared with conventional filters, the scheme has the advantage of more powerful noise suppression with less signal distortion. The desire for having high quality output signals from raw MCG data acquired in a simple shielded room or even in unshielded environment may be realized with the scheme. 相似文献
4.
Magnetic field induced phase branches of the superconducting transition in two-dimensional square π-loop arrays 下载免费PDF全文
Based on the results of explicit forms of free energy density for each possible arrangement of magnetization fluxes in large-scale two-dimensional (2D) square π-loop arrays given by Li et al [2007 Chin. Phys. 16 1450], the field-cooled superconducting phase transition is further investigated by analysing the free energy of the arrays with a simplified symmetrical model. Our analytical result is exactly the same as that obtained in Li's paper by means of numerical calculations. It is shown that the phase transition splits into two branches with either ferromagnetic or anti-ferromagnetic flux ordering, which depends periodically on the strength of external magnetic flux φe through each loop and monotonically on the screen parameter β of the loops in the arrays. In principle, the diagram of the phase branches is similar to that of its one-dimensional counterpart. The influence of thermal fluctuation on the flux ordering during the transition from normal to superconducting states of the π-loop arrays is also discussed. 相似文献
5.
Based upon the calculations of energy levels and quantum states, we discuss the probability of quantum spontaneous magnetization flux as a function of the screen parameter β for the superconducting ring containing one Josephson π-junction, and compare the result with that in the classical case. Our results indicate that there is significant difference in the magnetization behaviour aroundβ = 1 between the quantum and classical situations. 相似文献
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