51 research outputs found
Statistical evaluation of characteristic earthquakes in the frequency-magnitude distributions of Sumatra and other subduction zone regions
Shallow geophysical techniques to investigate the groundwater table at the Great Pyramids of Giza, Egypt
The near-surface groundwater aquifer that threatened the Great
Pyramids of Giza, Egypt, was investigated using integrated geophysical
surveys. A total of 10 electrical resistivity imaging, 26 shallow seismic
refraction, and 19 ground-penetrating radar surveys were conducted in the Giza
Plateau. Collected data for each method were evaluated by state-of-the art
processing and modeling techniques. A three-layer model depicts the
subsurface layers and better delineates the groundwater aquifer and water
table elevation. The resistivity of the aquifer layer and seismic velocity vary
between 40 and 80 Ωm and between 1500 and 2500 m s−1, respectively. The average water table elevation is about
+15 m, which is safe for the Great Sphinx, but it is still subjected to potential
hazards from the Nazlet El-Samman suburb where the water table elevation
reaches 17 m. A shallower water table at the Valley Temple and the tomb of Queen
Khentkawes,
with a low topographic relief, represents severe hazards. It can be concluded that
a perched groundwater table is detected in the elevated topography to the west and
southwest that might be due to runoff and capillary seepage.</p
Clients' reasons for prenatal ultrasonography in Ibadan, South West of Nigeria
<p>Abstract</p> <p>Background</p> <p>Prenatal ultrasonography has remained a universal tool but little is known especially from developing countries on clients' reasons for desiring it. Then aim was to determine the reasons why pregnant women will desire a prenatal ultrasound.</p> <p>Methods</p> <p>It was a cross-sectional survey of consecutive 222 women at 2 different ultrasonography facilities in Ibadan, South-west Nigeria.</p> <p>Results</p> <p>The mean age of the respondents was 30.1 ± 4.5 years. The commonest reason for requesting for prenatal ultrasound scans was to check for fetal viability in 144 women (64.7%) of the respondents, followed by fetal gender determination in 50 women (22.6%. Other reasons were to check for number of fetuses, fetal age and placental location. Factors such as younger age, artisans profession and low level of education significantly influenced the decision to check for fetal viability on bivariate analysis but all were not significant on multivariate analysis. Concerning fetal gender determination, older age, Christianity, occupation and gravidity were significant on bivariate analysis, however, only gravidity and occupation remained significant independent predictor on logistic regression model. Women with less than 3 previous pregnancies were about 4 times more likely to request for fetal sex determination than women with more than 3 previous pregnancies, (OR 3.8 95%CI 1.52 – 9.44). The professionals were 7 times more likely than the artisans to request to find out about their fetal sex, (OR 7.0 95%CI 1.47 – 333.20).</p> <p>Conclusion</p> <p>This study shows that Nigerian pregnant women desired prenatal ultrasonography mostly for fetal viability, followed by fetal gender determination. These preferences were influenced by their biosocial variables.</p
Crystal Structure of 2-Nitro-3,4,4-trichloro-1-mono(dodecyl thio)-1-mono[(4-fluorophenyl)piperazine]-1,3-butadiene Compound
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