39 resultados para Archaeological Site
em Cambridge University Engineering Department Publications Database
A sequential Monte Carlo EM approach to the transcription factor binding site identification problem
A sequential Monte Carlo EM solution to the transcription factor binding site identification problem
Resumo:
The field emission properties of nanostructured carbon films deposited by cathodic vacuum arc in a He atmosphere have been studied by measuring the emission currents and the emission site density. The films have an onset field of ∼ 3 V/μm. The emission site density is viewed on a phosphor anode and it increases rapidly with applied field. It is assumed that the emission occurs from surface regions with a range of field enhancement factors but with a constant work function. The field enhancement factor is found to have an exponential distribution.
