In the „70s an important copper ore mine was implemented in Recsk, Northern Hungary. Unfortunately as soon as the use of the roadways were finished the activities were suspended, because the decreasing price of the copper on the international market. The mine then was abandoned the roadways...

A random medium model is proposed to study the energy of quantum object and the local energy transport between quantum objects and the random medium. This local energy transport phenomenon arises from the collision between the quantum object and the random medium. By using a proposed microscopic...

The combination of spatial smoothing and asymptotic analysis allows reduction of computationally expensive 3D fuel cell models to 2D without sacrificing leading-order physics. This paper investigates, demonstrates, and verifies the spatial smoothing and asymptotic reduction of a 3D...

The energy demand has increased dramatically in the recent decades. Due to the limitations and environmental effects of fossil fuels, secure level of energy supply is vital for economic and social development. This work is to review the energy sector in South Africa. After that, the consumptions...