Geir Kjetil Nilsen

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A fast algorithm for creating time-frequency representations based on a special case of the short-time Fourier transform (STFT) is presented. The algorithm is extended with the method known as time-frequency reassignment. This approach makes time-frequency reassignment well suited for real-time implementations.
Nod factors secreted by Rhizobium leguminosarum by, viciae induce root hair deformation, the formation of nodule primordia, and the expression of early nodulin genes in Vicia sativa (vetch). Root hair deformation is induced within 3 h in a small, susceptible zone (+/-2 mm) of the root. NH4NO3, known to be a potent blocker of nodule formation, inhibits root(More)
The formation of zoospores or gametes in the green alga Ulva mutabilis Føyn is shown to be blocked by some substance(s) which can be extracted into fresh growth medium from a suspension of living thallus fragments. The inhibiting power of thallus extract is greatly reduced by heat treatment, but heat-stable components may also be present since active(More)
I would first of all like to thank my advisor Matthew G. Parker for his guidance and help on my thesis. His excellent guidance has been a significant asset to this thesis. I would also like to thank my fellow students and friends for their help, support and understanding through the process of this thesis; Finally, I would like to thank my girlfriend(More)
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