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  • A discussion on the three-dimensional boundary value problem for electromagnetic fields
    Filetype[PDF - 123.86 KB]
    Personal Author:
    Rankin, David
    Conference Authors:
    Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)
    Published Date:
    1973
    Source:
    Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 92-94
    Series:
    Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines
    Description:
    Three -dimensional boundary value problems are difficult to solve. Indeed, while the separation of the scalar wave equation can be effected in 11 diff...
    File Type:
    Filetype[PDF - 123.86 KB]
    File Type:
    Filetype[PDF - 123.86 KB]
  • The perturbation of alternating electromagnetic fields by three-dimensional bodies
    Filetype[PDF - 143.65 KB]
    Personal Author:
    Jones, F. W.
    Conference Authors:
    Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)
    Published Date:
    1973
    Source:
    Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 86-91
    Series:
    Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines
    Description:
    The perturbation of alternating electromagnetic fields by three-dimensional structures is considered. The general model is that of a semi-infinite con...
    File Type:
    Filetype[PDF - 143.65 KB]
    File Type:
    Filetype[PDF - 143.65 KB]
  • Performance of manpack electromagnetic location equipment in trapped miner location tests
    Filetype[PDF - 1010.41 KB]
    Personal Author:
    Farstad, Arnold J.
    Conference Authors:
    Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)
    Published Date:
    1973
    Source:
    Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 62-72
    Series:
    Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines
    Description:
    The use of radio signals for underground communications was considered as early as the mid-1920's [1] - [4] . However, early experiments did not produ...
    File Type:
    Filetype[PDF - 1010.41 KB]
    File Type:
    Filetype[PDF - 1010.41 KB]
  • An underground electromagnetic sounder experiment
    Filetype[PDF - 31.08 KB]
    Personal Author:
    Dolphin, Lambert ; Bollen, Robert ; ...
    Conference Authors:
    Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)
    Published Date:
    1973
    Source:
    Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 168
    Series:
    Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines
    Description:
    An electromagnetic sounder developed for an archaeological application in Egypt has been successfully tested in a California dolomite mine. Chambers i...
    File Type:
    Filetype[PDF - 31.08 KB]
    File Type:
    Filetype[PDF - 31.08 KB]
  • Feasibility of a radiocommunication in mine galleries by means of a coaxial cable having a high coupling impedance
    Filetype[PDF - 326.47 KB]
    Personal Author:
    Fontaine, J. ; Demoulin, B. ; ...
    Conference Authors:
    Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)
    Published Date:
    1973
    Source:
    Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 130-139
    Series:
    Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines
    Description:
    To realize a radiowave communication along mine galleries a few kilometers long without repeater, we show that it is possible to use a coaxial cable b...
    File Type:
    Filetype[PDF - 326.47 KB]
    File Type:
    Filetype[PDF - 326.47 KB]
  • Objectives and constraints of through-the-earth electromagnetic communication systems
    Filetype[PDF - 502.00 KB]
    Personal Author:
    Parkinson, Howard E.
    Conference Authors:
    Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)
    Published Date:
    1973
    Source:
    Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 1-8
    Series:
    Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines
    Description:
    In 1969, new coal mine health and safety legislation was enacted in the United States. As a result of this legislation, the Department of Interior, Bu...
    File Type:
    Filetype[PDF - 502.00 KB]
    File Type:
    Filetype[PDF - 502.00 KB]
  • State of knowledge of analytical techniques for thru-the-earth electromagnetic wave problems relevant to mine rescue
    Filetype[PDF - 232.46 KB]
    Personal Author:
    Wait, James R.
    Conference Authors:
    Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)
    Published Date:
    1973
    Source:
    Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 9-14
    Series:
    Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines
    Description:
    It is the purpose of this paper to review theoretical model concepts in through- the -earth transmission of electromagnetic waves. While the subject i...
    File Type:
    Filetype[PDF - 232.46 KB]
    File Type:
    Filetype[PDF - 232.46 KB]
  • Application of the coal mine roof rating (CMRR) to extended cuts
    Filetype[PDF - 392.88 KB]
    Personal Author:
    Mark, Christopher
    Corporate Authors:
    Pittsburgh Research Laboratory (National Institute for Occupational Safety and Health)
    Conference Authors:
    Society for Mining, Metallurgy, and Exploration annual meeting (1998)
    Published Date:
    March 1998
    Source:
    Society for Mining, Metallurgy, and Exploration Annual Meeting, 1998 Mar: 1-7
    Description:
    "Since it was first introduced, the Coal Mine Roof Rating (CMRR) has been widely accepted as a tool for geologic characterization and mine planning. T...
    File Type:
    Filetype[PDF - 392.88 KB]
    File Type:
    Filetype[PDF - 392.88 KB]
  • Summary report on electromagnetic noise measurement program
    Filetype[PDF - 37.61 KB]
    Personal Author:
    Adams, John W.
    Conference Authors:
    Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)
    Published Date:
    1973
    Source:
    Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 169
    Series:
    Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines
    Description:
    The present status of the National Bureau of Standards program is that many magnetic tapes of analog data have been recorded in four major mines. Each...
    File Type:
    Filetype[PDF - 37.61 KB]
    File Type:
    Filetype[PDF - 37.61 KB]
  • Electromagnetic survey method applicable to underground quarries; proceedings of thru-the-earth electromagnetics workshop
    Filetype[PDF - 739.67 KB]
    Personal Author:
    Gabillard, R. ; Dubus, J. P. ; ...
    Conference Authors:
    Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)
    Published Date:
    1973
    Source:
    Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 121-129
    Series:
    Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines
    Description:
    We present an electromagnetic method taken from the well known radiogoniometer that allows us to locate at the surface of the ground the vertical axis...
    File Type:
    Filetype[PDF - 739.67 KB]
    File Type:
    Filetype[PDF - 739.67 KB]
  • The use of nitrogen-enhanced foam at the Pinnacle mine fire
    Filetype[PDF - 1.82 MB]
    Personal Author:
    Smith, Alex C. ; Mucho, Thomas P. ; ...
    Corporate Authors:
    Pittsburgh Research Laboratory (National Institute for Occupational Safety and Health)
    Conference Authors:
    National Coal Show (June 7-9, 2005 : Pittsburgh, Pennsylvania)
    Published Date:
    June 2005
    Source:
    Proceedings of the National Coal Show, Pittsburgh, Pennsylvania, June 7-9, 2005. Denver, CO: Mining Media, Inc., 2005 Jun:1-15.
    Description:
    "This paper evaluates the effectiveness of remotely applied nitrogen-enhanced foam to aid in efforts to isolate and suppress a mine fire. The foam, in...
    File Type:
    Filetype[PDF - 1.82 MB]
    File Type:
    Filetype[PDF - 1.82 MB]
  • Theory of the propagation of UHF radio waves in coal mine tunnels
    Filetype[PDF - 500.48 KB]
    Personal Author:
    Emslie, Alfred G. ; Lagace, Robert L. ; ...
    Conference Authors:
    Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)
    Published Date:
    1973
    Source:
    Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 38-48
    Series:
    Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines
    Description:
    This paper is concerned with the theoretical study of UHF radio communication in coal mines, with particular reference to the rate of loss of signal s...
    File Type:
    Filetype[PDF - 500.48 KB]
    File Type:
    Filetype[PDF - 500.48 KB]
  • Summary report of operational communications working group
    Filetype[PDF - 640.36 KB]
    Personal Author:
    Roetter, Martyn F.
    Conference Authors:
    Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)
    Published Date:
    1973
    Source:
    Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 202-217
    Series:
    Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines
    File Type:
    Filetype[PDF - 640.36 KB]
    File Type:
    Filetype[PDF - 640.36 KB]
  • Theory and experiments relating to electromagnetic fields of buried sources with consequences to communication and location
    Filetype[PDF - 370.87 KB]
    Personal Author:
    Geyer, Richard G.
    Conference Authors:
    Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)
    Published Date:
    1973
    Source:
    Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 20-33
    Series:
    Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines
    Description:
    One aspect of a program to improve the chances of survival following coal mine disasters is the development of a communications system which will allo...
    File Type:
    Filetype[PDF - 370.87 KB]
    File Type:
    Filetype[PDF - 370.87 KB]
  • Guided propagation of radio waves
    Filetype[PDF - 193.64 KB]
    Personal Author:
    Delogne, P. ; Deryck, L. ; ...
    Conference Authors:
    Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)
    Published Date:
    1973
    Source:
    Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 48-53
    Series:
    Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines
    Description:
    So far as the propagation of electromagnetic waves is concerned, an underground tunnel behaves like a pipe or hollowed waveguide. Waves propagate in t...
    File Type:
    Filetype[PDF - 193.64 KB]
    File Type:
    Filetype[PDF - 193.64 KB]
  • Use of the zonal harmonic series for obtaining numerical solutions to electromagnetic boundary value problems
    Filetype[PDF - 522.62 KB]
    Personal Author:
    Lewis, Richard L.
    Conference Authors:
    Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)
    Published Date:
    1973
    Source:
    Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 98-103
    Series:
    Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines
    Description:
    This is a discussion of the application of the zonal harmonic series to problems involving dipole sources in the vicinity of spherical boundaries. The...
    File Type:
    Filetype[PDF - 522.62 KB]
    File Type:
    Filetype[PDF - 522.62 KB]
  • Admittance and effective height of buried antennas
    Filetype[PDF - 27.45 KB]
    Personal Author:
    Franceschetti, Giorgio
    Conference Authors:
    Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)
    Published Date:
    1973
    Source:
    Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 162-167
    Series:
    Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines
    Description:
    Explicit expressions are presented for the input admittance and effective height of several buried metal antennas, namely: (i) prolate spheroidal; (ii...
    File Type:
    Filetype[PDF - 27.45 KB]
    File Type:
    Filetype[PDF - 27.45 KB]
  • Electromagnetic transmission and detection at deep depths
    Filetype[PDF - 273.87 KB]
    Personal Author:
    Starkey, D. B.
    Conference Authors:
    Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)
    Published Date:
    1973
    Source:
    Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 140-148
    Series:
    Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines
    Description:
    nvestigation into the expressions of the field produced by a loop over a conducting half space or in an infinite conducting half space are well docume...
    File Type:
    Filetype[PDF - 273.87 KB]
    File Type:
    Filetype[PDF - 273.87 KB]
  • Experimental comparison of buried and elevated ELF transmitting antennas
    Filetype[PDF - 249.63 KB]
    Personal Author:
    Bannister, Peter R. ; Williams, Frederick J. ; ...
    Conference Authors:
    Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)
    Published Date:
    1973
    Source:
    Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 162-167
    Series:
    Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines
    Description:
    During the last week in March and the first week in April, 1973, the Naval Underwater Systems Center measured the 76 Hz magnetic field strength (in Wi...
    File Type:
    Filetype[PDF - 249.63 KB]
    File Type:
    Filetype[PDF - 249.63 KB]
  • Radio propagation measurements in coal mines at UHF and VLF
    Filetype[PDF - 346.24 KB]
    Personal Author:
    Goddard, Arthur E.
    Conference Authors:
    Thru-the-Earth-Electromagnetics Workshop (1973 : Colorado School of Mines)
    Published Date:
    1973
    Source:
    Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines, p. 54-61
    Series:
    Proceedings of Thru-the-Earth Electromagnetics, August 15-17,1973, Colorado School of Mines
    Description:
    Radio propagation measurements were conducted in a coal mine at UHF (200 to 1000 MHz) and VLF (1 to 50 kHz) to characterize the transmission loss of i...
    File Type:
    Filetype[PDF - 346.24 KB]
    File Type:
    Filetype[PDF - 346.24 KB]
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