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Thermal noise fundamentally limits the frequency stability of optical resonators used in optical clocks or to generate ultrapure microwaves by optical frequency division. We will give an overview of the relevant noise mechanisms, their calculation and discuss different current developments to reduce the noise. In one approach a cryogenic silicon resonator with very low thermal noise operated at a...
Newly emerged applications are producing a large amount of traffic and connection in the Internets. And they are becoming increasingly difficult to detect. Signature based method are currently the approaches for discovering and detecting the patterns of application. However, these methods may confront their difficulty in validating the efficiency and quality of signatures for unknown applications...
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