Underground Mining Methods and Technology by A.B. Szwilski and M.J. Richards (Eds.)

By A.B. Szwilski and M.J. Richards (Eds.)

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M. (Advanced Technology Mining) programme and had the following objectives: to increase the productivity by reducing the cycle time of powered supports. to provide control systems that enabled face workers to be located in a dust free area. to reduce complication and cost. to ease operation. to minimise maintenance. During the last 10 years all these objectives have been achieved and in some cases have far exceeded original expectations. 33 DEVELOPMENT OF THE TECHNOLOGY The underground performance during the last few years have been good and gives us confidence that the next 5 years will see great expansion in the use of this new technology.

128-138. , New York, 1969, pp. 119-120. W. M. Barton, Comparison of subsidence over two different longwall panels, Mine Subsidence Control, Proceedings: Bureau of Mines Technology Transfer Seminar, Pittsburgh, PA, September 19, 1985, Bureau of Mines IC 9042, 1985, pp. 25-33. B. J. , Amsterdam, 1987 — Printed in The Netherlands 31 10 YEARS DEVELOPMENT EXPERIENCE IN ELECTRONIC LONGWALLING J. H. Walker, Deputy Managing Director and Technical Director, Dowty Mining Equipment Limited SUMMARY Dowty Mining Equipment have carried out a 10 year development programme into the electronic control of shield supports.

Moreover, computers can be used to further speedup the process of analyzing and preparing the data needed for these diagrams. v,= v m 'm Fig. N. N. Theory of network planning together with graph theory may be used to develop an algorithm which will create a (systematic) enumerated graph of a ventilation network. Enumeration of such a graph requires that the set of nodes be grouped into levels (and given appropriate labels), according to their relative distance from the start node. Let G = (V,E) be an acyclic directed graph representing the air-flow network of a given mine.

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