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  • Artikel  (4)
  • Mine ventilation  (4)
  • Springer  (4)
  • American Physical Society (APS)
  • Blackwell Publishing Ltd
  • De Gruyter
  • Geological Society of America
  • International Union of Crystallography
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  • 1984  (4)
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  • Geologie und Paläontologie  (4)
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  • Artikel  (4)
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  • Springer  (4)
  • American Physical Society (APS)
  • Blackwell Publishing Ltd
  • De Gruyter
  • Geological Society of America
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  • 1995-1999
  • 1980-1984  (4)
  • 1955-1959
  • 1935-1939
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  • 2004
  • 1984  (4)
  • 1981
  • 1959
  • 1937
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  • Geologie und Paläontologie  (4)
  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Geotechnical and geological engineering 2 (1984), S. 229-243 
    ISSN: 1573-1529
    Schlagwort(e): Mine ventilation ; ventilation network analysis ; multiple-fan ventilation networks ; system resistance
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie
    Notizen: 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.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Geotechnical and geological engineering 2 (1984), S. 185-227 
    ISSN: 1573-1529
    Schlagwort(e): Mine ventilation ; mine planning ; computer applications in mining ; mine heat load ; mine environment
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie
    Notizen: 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.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 3
    Digitale Medien
    Digitale Medien
    Springer
    Geotechnical and geological engineering 2 (1984), S. 245-252 
    ISSN: 1573-1529
    Schlagwort(e): Mine ventilation ; ventilation networks ; nonlinear programming
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie
    Notizen: 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.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Springer
    Geotechnical and geological engineering 2 (1984), S. 261-267 
    ISSN: 1573-1529
    Schlagwort(e): Mine ventilation ; ventilation network analysis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie
    Notizen: 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.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
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