Texas Governor Lays Out School Safety Plan In Wake Of Santa Fe Shooting

Texas Gov. Greg Abbot hosts a recent roundtable discussion with victims, families and friends affected by the Santa Fe, Texas, school shooting that killed 10 people earlier this month. People with ties to other recent mass shootings were also invited.

Arming more teachers, creating new alarm systems and changing mental health rules are part of a wide-ranging list presented by Gov. Greg Abbott, nearly two weeks after 10 people died in the attack.

(Image credit: Drew Anthony Smith/Getty Images)

News : NPR https://ift.tt/2L5KJto May 30, 2018 at 07:57PM

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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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