Xi shores up power with demand for army obedience and foreign respect

President warns that China will not ‘swallow bitter fruit’ of threats to sovereignty, while telling military: ‘The Communist party commands the gun’

President Xi Jinping has vowed China will never “swallow the bitter fruit” of foreign meddling or invasion, in his latest move to assert his authority ahead of a key political summit marking the end of his first five-year term.

In a 50-minute speech at Beijing’s Great Hall of the People, the Mao era arena of Communist party rule, Xi told members of the military their calling was not as an aggressive or expansionist force.

Continue reading...The Guardian http://ift.tt/2vd2Zgk August 01, 2017 at 09:42AM

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Solving Van der Pol equation with ivp_solve

Van der Pol’s differential equation is The equation describes a system with nonlinear damping, the degree of damping given by μ. If μ = 0 the system is linear and undamped, but for positive μ the system is nonlinear and damped. We will plot the phase portrait for the solution to Van der Pol’s equation in Python using SciPy’s new ODE solver ivp_solve . The function ivp_solve does not solve second-order systems of equations directly. It solves systems of first-order equations, but a second-order differential equation can be recast as a pair of first-order equations by introducing the first derivative as a new variable. Since y is the derivative of x , the phase portrait is just the plot of ( x , y ). If μ = 0, we have a simple harmonic oscillator and the phase portrait is simply a circle. For larger values of μ the solutions enter limiting cycles, but the cycles are more complicated than just circles. Here’s the Python code that made the plot. from scipy import linspace from ...

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