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61. Permeability and volumetric changes in coal under different test environment

Creator:
Aziz, Naj, Ren, Ting, Nemcik, Jan, and Zhang, Lei
Format:
print, bez média, and svazek
Type:
article, články, model:article, and TEXT
Subject:
Geologie. Meteorologie. Klimatologie, těžba uhlí, doly, coal mining, mines, coal mine gas, coal permeability, volumetric changes, 7, and 551
Language:
English
Description:
Permeability refers to the ability of coal to transmit gas when a pressure or concentration gradient exists across it. The permeability of coal is dependent upon factors that include effective stress, gas pressure, water content, disturbance associated with drilling and matrix swelling/shrinkage due to adsorption/desorption. A programme of laboratory tests were conducted on coal samples from the Bulli seam for evaluating the permeability and drainability of coal. Two different types of permeability apparatus were used in this study. The methods of permeability testing of coal under different triaxial conditions are discussed. Permeability testing of the Bulli seam coal with N2 is described. The laboratory test results were found to be in agreement with the calculated permeability values, Naj Aziz, Ting Ren, Jan Nemcik and Lei Zhang., and Obsahuje bibliografii
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

67. Poddanské městečko Kladno a jeho okolí v čase napoleonských válek /

Creator:
Drvola, Karel,
Type:
studie
Subject:
Vojenství. Obrana země. Ozbrojené síly, Dějiny Česka a Slovenska, války napoleonské (1803-1815), dějiny měst, těžba uhlí, hornictví, dějiny vojenství, české země 1792-1847, města, obce, and vojenské operace, války, bitvy
Language:
Czech
Description:
Das Untertanenstädtchen Kladno und seine Umgebung in der Zeit der napoleonischen Kriege.
Rights:
unknown