非线性物理：混沌物理 4.5 4.5 (a) (b) 4.0 n Xn+ 3.5 3.5 3.0 3.0 2.5 1000 2000 3000 4000 2-853.03.54.04.5 Iteration Number Xn FIG.2.(a)Time series of X.=V(t)for Hde(nominal)=0.112 Oe.H=2.050 Oe,and f=0.85 Hz.Control was initiated after iteration 2350.(b)The first return map (X+vs X.)for the controlled system (in black)is superimposed on the map for the un- controlled system (in gray).The large density of points of low values of X.is due to the saturation of the sensor for large excursions of the ribbon away from the sensor. ● 清楚看到单周期吸引子在控制后稳定在单倍周期轨道。这种控制 的数学计算依然是一种线性处理。 非线性物理：混沌物理 • 清楚看到单周期吸引子在控制后稳定在单倍周期轨道。这种控制 的数学计算依然是一种线性处理