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  • Articles  (8)
  • Mine ventilation  (4)
  • exploration  (4)
  • Springer  (8)
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  • Geosciences  (8)
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  • Articles  (8)
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  • Springer  (8)
  • American Meteorological Society
  • American Physical Society (APS)
  • Cambridge University Press
  • De Gruyter
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  • 2000-2004
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  • 1984  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Geotechnical and geological engineering 2 (1984), S. 229-243 
    ISSN: 1573-1529
    Keywords: Mine ventilation ; ventilation network analysis ; multiple-fan ventilation networks ; system resistance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Summary The definitions of system pressure loss (mine head) and system resistance, which are traditionally associated with single-fan networks, are applied to multiple-fan ventilation networks. The system characteristics, relations among air power, pressure loss, air quantity and resistance, are analysed by introducing the concept of subsystems. These subsystems are associated with the fans located in a cutset of the network. For a multiple-fan network, the resistances for the subsystems and total system are dependent on the quantity ratios of the subsystems. In general the pressure loss of a subsystem or a total system does not vary as the square of the corresponding air quantity. If the quantity ratios of subsystems are all held constant, then the resistances become constant and the pressure losses are predictable from the quantities employing the ‘square law’. The system resistance has a minimum value under the natural-splitting flow pattern. Being independent of the value of system quantity, the minimum system resistance provides a basis for comparing the different networks.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Mathematical geology 15 (1983), S. 163-181 
    ISSN: 1573-8868
    Keywords: oil ; gas ; resources evaluation ; subjective probability ; multivariate lognormal ; exploration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Mathematics
    Notes: Abstract Since 1973 the Geological Survey of Canada has been making estimates of the petroleum resources for Canadian sedimentary basins. The purpose of this activity has been to provide a systematic approach to making an inventory of petroleum resources for departmental planning purposes. The resource evaluation was processed by the Hydrocarbon Assessment System Processor (HASP), devised by the Geological Survey of Canada. Since then, demands on the evaluation capability have increased and at the same time evaluation data have been increasingly applied to economic analyses. HASP can no longer be adapted to handle the new challenges. This study contains a probabilistic formulation for HASP and establishes a framework from which the following may be calculated: (1)distribution of number of pools; (2)expected rth largest pool size and its distribution; and (3)generation of reservoir parameters for a given pool size. Play 10 from the East Coast of Canada was used as an example to illustrate the applications of the analytical approach presented. This paper demonstrates that the analytical approach has more to offer than HASP.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Mathematical geology 15 (1983), S. 183-195 
    ISSN: 1573-8868
    Keywords: Computers ; data files ; exploration ; geostatistics ; petroleum ; prospects ; spatial filtering ; trend analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Mathematics
    Notes: Abstract Computer recognition of prospective areas through the processing of digital exploration data can be effective if the statistical tests for the determination of the prospects are pertinent to the presence of the desired mineral. Where exploration involves the application of polynomial trend analysis to structure contour maps in the search for petroleum and natural gas, standard analysis of variance tests may not indicate the best exploration maps. Variance tests may be completely invalid where isolated dips and clustered samples cause the surfaces generated by some of the most common trend programs to oscillate, creating a false impression of variance. On the other hand, tests that directly compare the position of residual features with areas of known production consistently indicate the best map for the determination of new prospects. They are simple to apply and appear to offer the most opportunity for the automatic recognition of prospective areas.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Geotechnical and geological engineering 1 (1983), S. 331-342 
    ISSN: 1573-1529
    Keywords: Optimization ; geostatistics ; mining ; exploration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Summary In this paper mathematical programming models and special solution algorithms are presented for the optimal allocation of data points for regionalized variables. Two models are discussed; the first one minimizes the estimation variance subject to a given number of additional measurement points or additional measurement cost. The second model minimizes the number of additional points or additional cost subject to upper bounds given to the estimation variances. The models are based on the theory of kriging and the properties of the estimation variances, which lead to certain multiobject programming problems. As it can be shown, a special branch and bound algorithm can be used for solving the resulting nonlinear programming problems
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Geotechnical and geological engineering 2 (1984), S. 185-227 
    ISSN: 1573-1529
    Keywords: Mine ventilation ; mine planning ; computer applications in mining ; mine heat load ; mine environment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Conclusions In this paper, the author has attempted to trace the development of mine ventilation planning from the traditional, manual and largely empirical methods of the past to the numerate computer-based techniques of the 1980s. The computer revolution has changed the face of many engineering disciplines, not least mine environmental engineering. Nevertheless, the mining industries of the world have not all been equally progressive in adapting to the flexibility, power and practical utilization of the new methodologies. It is, for example, incongruous that current textbooks on mine ventilation separate completely the topics of network analysis and ventilation planning with very little cross-referencing. Many of the current generation of mine ventilation engineers recognize the need to ‘know about computers’ but find difficulty in translating this into their daily work. The growing availability of self-teaching, friendly software for personal microcomputers, coupled with interactive graphics, will assist greatly in promoting uncomplicated but powerful usage of computers. Young engineers now graduating from universities and colleges have been brought up in a computer-oriented environment and are competent in interacting with these machines. Indeed, they wonder how the job was ever done without magnetic data bases and high-speed computation aid.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Geotechnical and geological engineering 2 (1984), S. 245-252 
    ISSN: 1573-1529
    Keywords: Mine ventilation ; ventilation networks ; nonlinear programming
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Summary Solving ventilation networks of natural air splitting is a classical problem in mine ventilation. A common approach to this problem is to formulate it based on Kirchhoff's voltage and current laws and obtain the solution by an iterative technique known as the Hardy Cross method. In this paper, it is shown that the problem can be formulated and analysed as an unconstrained optimization (minimization) problem. The computational experience with the method of conjugate gradients is also discussed.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Geotechnical and geological engineering 2 (1984), S. 261-267 
    ISSN: 1573-1529
    Keywords: Mine ventilation ; ventilation network analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Conclusion An airflow direction of any diagonal branch in ventilation networks is a function of the resistance of each branch, but its own resistance is not a factor. It is difficult to determine the airflow of diagonal branches. But the airflow direction of diagonal branches in some complex networks can be discriminated by applying theproperties 3–8 to V-shaped, T-shaped, Y-shaped, X-shaped and double diagonal branches networks.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Geotechnical and geological engineering 1 (1983), S. 343-355 
    ISSN: 1573-1529
    Keywords: Geostatistics ; exploration ; optimization ; contractional mapping ; sampling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Summary A method is developed for selecting the number and location of additional exploratory boreholes using an iterative procedure based on a mathematical optimization concept called fixed point theory. The method is illustrated through its application to an exploratory drilling program for a coal mine where optimized locations gave a lower estimate of regional and block variances than the manual choice.
    Type of Medium: Electronic Resource
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