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  • Small-diameter observation wells  (1)
  • active set methods  (1)
  • 1
    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
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The smallest point of a polytope (1990)
    Springer
    Journal of optimization theory and applications 64 (1990), S. 429-432 
    Details
    ISSN: 1573-2878
    Keywords: Least-distance problems ; least-square problems with nonnegative variables ; active set methods ; row relaxation methods
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract This note suggests new ways for calculating the point of smallest Euclidean norm in the convex hull of a given set of points inR n . It is shown that the problem can be formulated as a linear least-square problem with nonnegative variables or as a least-distance problem. Numerical experiments illustrate that the least-square problem is solved efficiently by the active set method. The advantage of the new approach lies in the solution of large sparse problems. In this case, the new formulation permits the use of row relaxation methods. In particular, the least-distance problem can be solved by Hildreth's method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00939458
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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