21 research outputs found
Numerical model of air valve
This diploma thesis deals the formation of water hammer in pipes and the suppress the nega-tive effects especially for the use of protective devices (surge tank, air chamber, air valve and other). The special attention is paid to the use of the air valve, for which it was developed mathematical model. The solution is based on the use of numerical methods Lax-Wendroff with boundary conditions for the air valve.The numerical results are confronted with the ex-periment in conclusion
Amorphic complexity of group actions with applications to quasicrystals
In this article, we define amorphic complexity for actions of locally compact
-compact amenable groups on compact metric spaces. Amorphic complexity,
originally introduced for -actions, is a topological invariant which
measures the complexity of dynamical systems in the regime of zero entropy. We
show that it is tailor-made to study strictly ergodic group actions with
discrete spectrum and continuous eigenfunctions. This class of actions
includes, in particular, Delone dynamical systems related to regular model sets
obtained via Meyer's cut and project method. We provide sharp upper bounds on
amorphic complexity of such systems. In doing so, we observe an intimate
relationship between amorphic complexity and fractal geometry.Comment: 26 pages, AAM versio