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  • 1
    ISSN: 1432-0495
    Keywords: Effective porosity ; Specific yield ; Migration ; Tracer test ; Porosity ; Tritium ; Finite element method ; Longitudinal dispersivity ; Sedimentary rock
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Effective porosity value was analyzed from the tritium concentration of sampled groundwater using a three-dimensional groundwater-flow and advection-dispersion code based on the finite element method. The effective porosity value was about 10%. Porosity values measured from core samples were 7–15%. The groundwater flow velocity estimated from the tritium concentrations was about 1 × 10−5 cm s−1. Therefore, during the low groundwater flow velocity condition, effective porosity and porosity values were the same. At the same test site, a 0.48% effective porosity value, determined by another tracer test injecting Br− solution into the aquifer during groundwater level change, was smaller than the porosity value when the flow velocity was 1.8×10−2 cm s−1. Thus the effective porosity value is concluded to be due to groundwater flow velocity. The specific yield value was calculated to be 0.6% by the total volume of tunnel seepage water and the total volume of the rock unsaturated during tunnel construction. However, as pore water continued to be drained after the groundwater level change was completed, the specific yield value became larger than 0.6%. Thus specific yield value is concluded to be due to drainage time.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0533
    Keywords: Granulovacuolar degeneration ; Hippocampus ; Topography ; Aging ; Dementia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The occurrence and topographic analysis of granulovacuolar degeneration (GVD) in the hippocampal cortex of mentally normal controls (75 cases) and patients with Alzheimer's dementia (AD; 17 cases which included Alzheimer's disease and senile dementia of Alzheimer type), multi-infarct dementia (MID; 16 cases), Pick's disease (PD; 5 cases) and atypical dementia [5 cases; non-Alzheimer, non-Pick dementia with Fahr's syndrome (NANPDF)] were investigated. GVD was rarely found in control cases below the age of 60 years. In elderly normal brains, the statistically most representative ranking order of predilection for GVD (in decreasing severity) was: in the 60 s, CA1〉prosubiculum 〉CA2 (no GVD was found in the CA3 and CA4); in the 70 s, CA1〉prosubiculum 〉CA2 〉CA3〉CA4; in the 80 s, CA1〉prosubiculum 〉CA2〉CA3〉CA4; in the 90s, CA1〉prosubiculum 〉CA2〉CA3〉CA4. In the brains of demented patients, the rank order for GVD was: for AD, CA1 〉CA2〉CA3〉 prosubiculum 〉CA4; for MID, CA1 〉 prosubiculum 〉CA2〉CA3〉CA4; for PD, CA1 〉CA2〉CA3〉 prosubiculum 〉CA4; and for atypical dementia (NANPDF), CA1〉CA2〉 prosubiculum 〉CA3〉CA4. The similarity of the predilection to ranking order was noted both in normal aged subjects and in MID as well as both in AD and in PD. The qualitative investigation disclosed that the affected neurons with GVD in the cases of AD were found in all the examined areas outside the hippocampus (gyrus praecentralis, temporal and occipital cortex, globus pallidus, amygdaloid nuclei, mammillary bodies, medial thalamic nuclei, red nuclei, nuclei basalis of Meynert, dentate nuclei and inferior olivary nuclei) and, contrary to the results in AD, there were no affected neurons with GVD in the cases of MID. The occurrence and distribution of GVD in demented patients were different in these respective disorders.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 3
    ISSN: 1432-0495
    Keywords: Key words Effective porosity ; Specific yield ; Migration ; Tracer test ; Porosity ; Tritium ; Finite element method ; Longitudinal dispersivity ; Sedimentary rock
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Effective porosity value was analyzed from the tritium concentration of sampled groundwater using a three-dimensional groundwater-flow and advection-dispersion code based on the finite element method. The effective porosity value was about 10%. Porosity values measured from core samples were 7–15%. The groundwater flow velocity estimated from the tritium concentrations was about 1 × 10–5 cm s–1. Therefore, during the low groundwater flow velocity condition, effective porosity and porosity values were the same. At the same test site, a 0.48% effective porosity value, determined by another tracer test injecting Br– solution into the aquifer during groundwater level change, was smaller than the porosity value when the flow velocity was 1.8 × 10–2 cm s–1. Thus the effective porosity value is concluded to be due to groundwater flow velocity. The specific yield value was calculated to be 0.6% by the total volume of tunnel seepage water and the total volume of the rock unsaturated during tunnel construction. However, as pore water continued to be drained after the groundwater level change was completed, the specific yield value became larger than 0.6%. Thus specific yield value is concluded to be due to drainage time.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
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