MD at constant temperature

[yong pei <ypnju "-at-" yahoo.com.cn>]

Dear sir
   Now, I perform a MD simulation of atomic system at
 constant temperature with Nose-Hoover scheme (Molec.
 Phys.52, 255, 1984.).The gear predict-corrector method
 was used . ,Then, how can I determine the initial
 values of s.derivate of s in the formular?
  Regards,
  yong Pei
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