We have studied the KS entropy of a 2-dimensional measure-preserving mapping with an elliptic or hyperbolic fixed point respectively, as well as that of its 3-dimensional extension.

我们已经研究了分别具椭圆和双曲不动点的二维保测度映射及其受摄三维扩张的KS熵。

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Objective To evaluate the safety and efficacy of radiofrequency catheter ablation guided by 3-dimensional electroanatomic mapping system (CARTO)in treatment of patients with atrial fibrillation (AF).

探讨在三维电解剖标测系统（CARTO）指导下经导管射频消融治疗心房颤动（房颤）的安全性和有效性。

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