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Start Over Coverage 353-356

2. Rezonance v kvantových grafech

Creator:
Lipovský, Jiří
Format:
print, bez média, and svazek
Type:
model:article and TEXT
Subject:
fyzika, physics, 6, and 53
Language:
Czech
Description:
We summarize the key results of the study in resonances on quantum graphs. Firstly we introduce the notion of a quantum graph. Then we distinguish two definitions of resonances - resolvent and scattering resonances. Furthermore, we study eigenvalues of a graph with rationally related lengths of the edges and resonances which come from these eigenvalues if the lengths of the edges are perturbed. Finally, we study asymptotics of the number of resonances and show criteria when the asymptotics is non-Weyl., Jiří Lipovský., and Obsahuje seznam literatury
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

3. Ubíhající elektrony

Creator:
Kulhánek, Petr
Format:
print, bez média, and svazek
Type:
model:article and TEXT
Subject:
fyzika, elektrony, tokamaky, physics, electrons, tokamaks, ubíhající elektrony, limitery, runaway electrons, ohmic regime, 6, and 53
Language:
Czech and English
Description:
Under normal conditions, electrons are accelerated by electric fields and decelerated by collision processes. After some time, a stable equilibrium between these two processes is achieved and electrons drift with constant speed against the field direction. Such a scheme is called the ohmic regime. At higher speeds or electric fields, the situation may be completely different. Collisions may not be able to compensate for electron acceleration and electrons attain the so called runaway mode. Runaway electrons are detected in the Earth’s magnetosphere during storms, in the solar plasma, and also in laboratory plasmas and in many plasma technologies., Petr Kulhánek., and Obsahuje bibliografii
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public