Formation of Propulsive Forces

Before discussing the three categories of delivery device, the nature of the emitted aerosol will be considered. Droplet formation may be characterized in terms of the nature of the propulsive force and the liquid being dispersed, and this topic is dealt with for specific situations in the following sections. However, dry particles, which are delivered from suspension in pMDIs or from DPIs alone or from a blend, must be prepared in respirable sizes. The production of respirable aerosol particles has traditionally been achieved by micronization of the drug [25]. This... 

It was mentioned earlier that high-precision nano pressure sensors dispersed in the surface material of a spacecraft could continuously measure the instantaneous drag forces on a satellite. This would, for exanqile, enable real-time propulsion adjustments for high-precision orbit trajectories (drag-fr orbits), a crucial element of satellite formation flying. The ever more frequent discoveries of novel nanoelectronic devices (18) and first denmnstrations thereof as chemical sensors (27) su t that such devices will also play a role in future hyperthermal particle sensing. 

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