介绍了一种将小波变换应用于ECG信号检测R波的算法。该算法主要是在离散小波变换和多分辨率分析原理的基础上,利用db1小波特有的时频域特性,运用M a llat快速算法对心电信号进行了3层小波分解,分别在2、3层小波分解的高频系数中选择一...
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介绍了一种将小波变换应用于ECG信号检测R波的算法。该算法主要是在离散小波变换和多分辨率分析原理的基础上,利用db1小波特有的时频域特性,运用M a llat快速算法对心电信号进行了3层小波分解,分别在2、3层小波分解的高频系数中选择一定的阈值作为R波的判定条件,实现R波检测。通过对M IT/B IH(M assachusetts Institu te of T echno logy/Boston's B eth Israe lHosp ita l)心电数据库的R波检测,结果表明,该检测算法即使在噪声干扰和病态的情况下,也很容易实现对R波的准确检测和精确定位,具有相当高的定位精度,R波正确检测率高达到99.8%。
Plasma membrane vesicles of chrysanthemum ( Dendranthema morifolium (Ramat.) Tzvel.) callus was purified by sucrose gradient centrifugation to investigate the influence of sound stimulation on the lipid physical st...
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Plasma membrane vesicles of chrysanthemum ( Dendranthema morifolium (Ramat.) Tzvel.) callus was purified by sucrose gradient centrifugation to investigate the influence of sound stimulation on the lipid physical states and metabolism of plasma membrane. The results showed that sound stimulation decreased the content of phosphodiesters and the fluorescent intensity of DPH, but increased the light scattering value of the membrane, the fluorescent intensity of MC540 and the content of phosphomonoesters, indicating that the vesicles got looser, the charge density and hydrophobicity of membrane surface decreased under sound stimulation of some strength and frequency. However, the membrane fluidity increased under the condition. Meanwhile, the anabolism of membrane lipid increased and the catabolism decreased. It can be seen that the physical state and metabolism of membrane lipid is sensitive to sound stimulation.
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