It is a generally accepted practice in the natural gas industry the approximation that the temperature of the flowing gas along the length of the pipeline is constant. Experimental investigations obtain the decrease of the temperature in the direction of the flow resulted by the heat transfer...

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...

It is a generally accepted practice in the natural gas industry the approximation that the temperature of the flowing gas along the length of the pipeline is constant. Experimental investigations obtain the decrease of the temperature in the direction of the flow resulted by the heat transfer...

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...