A METHOD FOR EVALUATING THE APPLICATION OF VARIABLE FREQUENCY DRIVES WITH COAL MINE VENTILATION FANS Tyson M. Murphy Thesis submitted to the faculty of the ia ...
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1 INTRODUCTION TO MINING 1.1 MINING'S CONTRIBUTION TO CIVILIZATION Mining may well have been the second of humankind's earliest endeavors— granted that ...
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Labor productivity in the mining industry has been declining rapidly around the world. In the US coal sector, for example, labor productivity declined by an average ...
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In the year 1877, the signals were given for the rest of the century: the blacks would be put back; the strikes of white workers would not be tolerated; the ...
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