It is found that acoustic internal conical refraction occurs for both fundamental and second harmonic of transverse wave propagating dong threefold axis of crystals.Energy walk-off which usually does not exist in acou...It is found that acoustic internal conical refraction occurs for both fundamental and second harmonic of transverse wave propagating dong threefold axis of crystals.Energy walk-off which usually does not exist in acoustic collinear harmonic generation appears as well.展开更多
Correlation dimensions D2 of the synchronous 12-lead ECG signals have been investigated for the first time by distributed multi-sensor (multi-electrode) technique. The results show that correlation dimension of heart ...Correlation dimensions D2 of the synchronous 12-lead ECG signals have been investigated for the first time by distributed multi-sensor (multi-electrode) technique. The results show that correlation dimension of heart has the distributed characteristics. D2 calculated from different lead ECG signals is not a constant regardless of a healthy person or a coronary heart disease (CHD) patient with sinus rhythm. But with the same lead signal, D2 of CHD patients is evidently smaller than that of a healthy person except I, II, III leads. A healthy person and CHD patient can be identified by D2 statistically and D2 shows the potential application in the diagnosis of the CHD patients.展开更多
基金the National Natui'al Science Foundation of China.
文摘It is found that acoustic internal conical refraction occurs for both fundamental and second harmonic of transverse wave propagating dong threefold axis of crystals.Energy walk-off which usually does not exist in acoustic collinear harmonic generation appears as well.
文摘Correlation dimensions D2 of the synchronous 12-lead ECG signals have been investigated for the first time by distributed multi-sensor (multi-electrode) technique. The results show that correlation dimension of heart has the distributed characteristics. D2 calculated from different lead ECG signals is not a constant regardless of a healthy person or a coronary heart disease (CHD) patient with sinus rhythm. But with the same lead signal, D2 of CHD patients is evidently smaller than that of a healthy person except I, II, III leads. A healthy person and CHD patient can be identified by D2 statistically and D2 shows the potential application in the diagnosis of the CHD patients.
