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  • 35.80.+s  (1)
  • Small-diameter observation wells  (1)
  • 1
    Electronic Resource
    Electronic Resource
    A simple model for the velocity modulation detection technique of molecular ions (1989)
    Springer
    Applied physics 48 (1989), S. 235-242 
    Details
    ISSN: 1432-0649
    Keywords: 35.80.+s ; 33.70.−w
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present a simple model to describe the line-profile of velocity modulated ions. This model is based on Langevin's theory of the mobility and on the independence of the electric field strength on the discharge current in the ideal positive column. A comparison of time constants responsible for the drift of the ions, the concentration, and the ignition and extinction of the discharge itself is essential for a rough understanding of the velocity modulation. The behaviour of H3O+ ions in an ac glow discharge was examined. Under our experimental conditions the line-profile can be explained by a temporal dependence of the velocity which is close to a square-wave. Due to this particular temporal dependence the amplitude of the signal only depends on the concentration modulation, while the line-shape is a simple difference line-profile.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00694351
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Monitoring the deterioration of small-diameter observation wells (1990)
    Springer
    Water resources management 4 (1990), S. 135-153 
    Details
    ISSN: 1573-1650
    Keywords: Small-diameter observation wells ; well blockage ; clogging ; visual inspection of hydrographs ; slug tests
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: Abstract This research studies the problem of monitoring the deterioration of small-diameter observation wells. It considers three methods for achieving this task: visual inspection of hydrographs, on-going recording of borehole depth, and analysis of slug tests. The relative merits of these methods are judged in view of the results of a large-scale field survey. The field results indicate that while the first two methods suffer certain disadvantages, the slug test method is a rather reliable tool.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00429802
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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