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  • 2000-2004  (1)
  • 1985-1989  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Numerical simulation of sea water intrusion near Beihai, China (2000)
    Springer
    Environmental geology 40 (2000), S. 223-233 
    Details
    ISSN: 1432-0495
    Keywords: Keywords Coastal aquifers ; Seawater intrusion ; Leaky aquifer system ; Numerical modeling ; Numerical simulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  A leaky aquifer system occurs in the coastal plain near Beihai, China. Seawater intrusion into the confined aquifer took place along the northern coast. Chloride concentrations at some observation wells increased steadily from 1988 and were at their peak in 1993. A quasi-three-dimensional element model has been developed to simulate the spatial and temporal evolution of hydraulic heads and chloride concentrations of the groundwater near the northern coast. The simulation model was based on the transition zone approach, which requires simultaneous solution of the governing water flow and solute transport equations. An irregular grid of a quadrangle was used to discretize the flow domain. Various aquifer parameters were verified with the numerical model in order to obtain satisfactory matches between computed values and observed data from an investigation. Three pumpage schemes were designed to use the calibrated model for prediction of future changes in water levels and chloride concentrations in groundwater in the study area. Results show that seawater intrusion would worsen in the confined aquifer if the current rates of groundwater pumpage continue. The alternative, to eliminate pumpage in the intruded area and to moderate pumpage rates from water supply wells far from the seashore, may limit seawater intrusion significantly and is considered attractive in the area.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002540000113
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of oxide additive in silicon nitride on interfacial structure and strength of silicon nitride joints brazed with aluminium (1989)
    Springer
    Journal of materials science 24 (1989), S. 2865-2870 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Silicon nitride ceramics with Y2O3 and Al2O3 as sintering additives were brazed with aluminium, and the brazed strength and the interfacial structure of the joints were compared with those of the joints made of additive-free silicon nitride ceramics. It is concluded that the additives in silicon nitride ceramics take part in the interfacial reaction, make the reaction layer thicker, and hence increase the brazed strength greatly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02385639
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Interfacial strength and chemistry of additive-free silicon nitride ceramics brazed with aluminium (1989)
    Springer
    Journal of materials science 24 (1989), S. 2879-2883 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Two kinds of additive-free silicon nitride ceramics were brazed with aluminium; one was with as-ground faying surfaces and the other was with faying surfaces heat-treated at 1073K for 1.8 ksec in air. The heat-treatment of the silicon nitride ceramics formed a silicon oxynitride layer on the faying surfaces and increased the brazing strength of the joints. A silica-alumina non-crystalline layer and a β′-sialon layer were formed successively from the aluminium side at the interface of the joints. The heat-treatment which made the former layer thicker is a necessary process in making reliable, strong brazed joints.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02385641
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    Paper (German National Licenses)
    Fulltext
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