Abstract: In an integrated MEMS device, moving silicon parts with smooth surfaces can stick together if they come into contact. By roughening at least one smooth surface, the effective area of contact, and therefore surface adhesion energy, is reduced and hence the sticking force is reduced. The roughening of a surface can be provided by etching the smooth surfaces in gas, plasma, or liquid with locally non-uniform etch rate. Various etch chemistries and conditions lead to various surface roughness.

Abstract: A system for electronic commercial information transmission, and the method for electronic information transmission applied therein. The system comprises a server and at least one portable work station that can communicate with the server on which a combination of free multi-media information are stored. The multi-media information is played free of charge with non-limited times. The music group and commercial goods will gradually become famous. The actions for watching the commercial information will enlarge the market for multi-media information download and the commodities business. This system will enclose the combination of the said multi-media information and commercial information in the greeting card and send the same to whose lover and families to offer the festival wishes, and this card, further to the multi-media information and commercial information will easily become the gossip topic of the public.

Abstract: A liquid dispensing apparatus, including a hollow horn having a central cylindrical cavity and a piezoelectric ring having a central opening. The piezoelectric ring is coupled to the hollow horn such that the central opening is in communication with one end of the central cylindrical cavity. A mesh screen is provided at the other end of the central cylindrical cavity. Liquid is delivered to an inner surface of the mesh screen through the central opening of the piezoelectric ring and the central cylindrical cavity of the hollow horn, and is dispensed from an outer surface of the mesh screen in the form of fine liquid droplets.