C Fried

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  • L D Smullin, A Bers, C Fried, Prof L J Chu, D L Bobroff, A J H A Lichtenberg +4 others
  • 2009
Current research in the tube laboratory is concerned with the study of the propagation of signals and noise along electron beams at microwave frequencies. A better understanding of the process of the propagation phenomenon at low modulation levels will lead to the construction of improved low-noise microwave amplifiers. A greater knowledge of the bunching(More)
The minimum noise figure of a traveling-wave tube obtainable by means of lossless beam transformers has been found (1) to be F m = 1 + 4T-(4QCf f)1/2 (S-1o) (1) mm kT max mm o o where So=-A1/ in which 4o is the self power spectrum of the noise voltage, To is the self power 0 0 spectrum of the noise current, A is the imaginary part of the cross power(More)
Variation databases promise to enable the assessment of recent selection pressure on genomic sequence elements. Evidence of recent selection would suggest recent functional relevance of elements potentially important for understanding the organization of the human genome and resulting complex phenotypes and diseases. In contrast, comparative sequence(More)
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