To evaluate the road safety development of a country over time, the percentage change in the number of road fatalities is traditionally the main indicator. However, simply considering the reduction in the road fatalities may not correctly reflect the real improvement in road safety because the transport circumstances of a country underlying the road fatalities also change every year. In this st...

We consider the following hyperbolic system of PDEs which generalize the classical phase field equations with a non-conserved order parameter / and temperature u: u tt #e2/ tt #c 1 u t #e2c 1 / t "a*u, e2/ tt #c 2 e2/ t "e2*/#f (/)# eu for e@1. We present the model, derive a law for the evolution of the interface which generalizes the classical flow by mean curvature equation, and analyze the e...

A regular language is called union-free if it can be represented by a regular expression that does not contain the union operation. Every regular language can be decomposed into a union of a finite number of union-free languages (the so-called union-free decomposition). We call the number of components in the minimal union-free decomposition of a regular language the union width of the regular ...

geopolitical imagination, by definition, is the competition between powers in forming individuals’, institutions’ and political factors’ perception of the characteristics and contents of geographical space, on the basis of their intended interests. in this article, as a case study, the us perception of the :union: of soviet socialist republics during the cold war era is analysed. the authors ar...