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  • 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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  • 2
    Electronic Resource
    Electronic Resource
    Photoconductivity measurement of polymers by x-ray absorption fine structure (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 7755-7758 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Photoconductivity spectra measurement of polymers at x-ray energies around the Zn and Co K edges shows obvious x-ray absorption fine structure oscillations. The photoconductivity spectra obtained for gapped and sandwiched electrode geometric samples indicate that the shape of photoconductivity spectrum depends on the electrode configuration of the samples. The thickness of the conduction layer can be estimated from the photoconductivity spectrum. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370580
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  • 3
    Electronic Resource
    Electronic Resource
    Local atomic structures of hematite nanoparticles studied with XAFS (1999)
    Chester : International Union of Crystallography (IUCr)
    Journal of synchrotron radiation 6 (1999), S. 749-751 
    Details
    ISSN: 1600-5775
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0909049598017051
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  • 4
    Electronic Resource
    Electronic Resource
    EXAFS studies of (Pb,Cd)1212 phase superconductor and (Bi,Cd)1212 phase compound (1999)
    Chester : International Union of Crystallography (IUCr)
    Journal of synchrotron radiation 6 (1999), S. 764-766 
    Details
    ISSN: 1600-5775
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0909049598017178
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  • 5
    Electronic Resource
    Electronic Resource
    Research of nonlinear optical properties of copper nanoparticles (1999)
    Springer
    The European physical journal 9 (1999), S. 591-594 
    Details
    ISSN: 1434-6079
    Keywords: PACS: 73.61.Tm Nanocrystalline materials – 83.70 Surfactants – 42.65.R Nonlinear optics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. This research reports the preparation and characterization of copper nanoparticles modified by didecyl benzene sulfonate (DBS). The Cu nanoparticles’ size was determined to be 4.0 nm by transmission electron microscope (TEM). The X-ray photoelectron spectrometry (XPS) results show that there are interactions between the copper nanoparticles and DBS function group. The nonlinear optical properties were studied by the four-wave mixing method. The value of χ(3)/α0 was found to be 6.9×10-11 esu cm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100530050506
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    Paper (German National Licenses)
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