Traian Nicolae Preda

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Norwegian distribution power systems are often composed of long distribution lines supplying households, communities and small industrial customers. When a significant amount of load contains power electronics devices, the harmonic pollution of these grids becomes semnificative. As the share of distributed generators in these power systems is increasing(More)
Zuk's criterion give us a condition for a finitely generated group to have Property (T): the smallest non-zero eigenvalue of Laplace operator ∆µ corresponding to the simple random walk on G(S) satisfies λ1(G) > 1 2. We present here two examples that prove that this condition cannot be improved. Definition 1. (see [1] and [2]) i) A random walk or Markov(More)
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