HOW dramatically the pendulum of fear has swung in the past year-from worries about the fragile recovery, to panic about the level of the national debt, and back to anxiety about growth again.
Based on the theory of horizontal pendulum, the theoretical function model of magnetic error of self adjusting level is deriveted, and observation equation in geomagnetic field is set up.
利用物理摆原理导出了自动安平水准仪磁致误差的理论函数模型，建立了地磁场中的观测方程。
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In this paper a new arm-driven inverted pendulum is presented, and a 4-input 1-output 3-layer BP neural network is designed to approach the first-level arm-driven inverted pendulum controller.