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  • 42.50+q  (1)
  • Small-diameter observation wells  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Saturation stabilization of the CO fundamental-band laser (1991)
    Springer
    Applied physics 53 (1991), S. 330-332 
    Details
    ISSN: 1432-0649
    Keywords: 42.50+q ; 42.55.Hq ; 42.72+h
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We recently reported the extension of CO laser operation to a variety of single-line transitions in the fundamental band (v=1 → 0). Now saturation stabilization of these lines could be achieved using an intracavity absorption cell with CO at low pressure. A 3f-detection technique allowed reliable frequency locking on transitions from P(8) to P(14). A frequency stability of better than 10kHz was indicated. The frequency of the P(14) transition was measured in a heterodyne experiment to be 62, 546, 358.324 (50) MHz.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00331822
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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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