Sun synchronous orbit and frozen orbit formed due to J 2 perturbation have very strict constraints on orbital parameters,which have restricted the application a
<正> In this paper we present an extension of thetopology optimization method to include uncertainties dur-ing the fabrication of macro,micro and nano structure
<正> The longitudinal steady-state control for goingfrom hovering to small speed flight of a model insect isstudied, using the method of computational fluid dyn