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Geoelectrical Investigation of a Proposed Dam Site in a Sedimentary Terrain: Case Study of Aba River at Amapu-Ideobia, Akanu Ngwa Southeastern Nigeria

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International Journal of Geosciences 2013年第10期4卷 1376-1381页

作者： Sabinus Ikechukwu Ibeneme Kalu Kalu Ibe Alexander Olusegun Selemo Johnbosco Okechukwu Nwagbara young ezenwa obioha Kingsley Obi Echendu Bridget Odochi Ubechu Department of Geosciences Federal University of Technology Owerri Nigeria Department of Physics Federal University of Technology Owerri Nigeria

The geoelectrical investigation of the proposed Aba River dam at Amapu-Ideobia, Akanu Ngwa Southeastern Nigeria has been carried out. The objective of this study is to determine the downward and lateral trends of the rock layers or units along and near the proposed dam axis and deduce the possible structures that may enhance workable design of the dam. ABEM Terrameter SAS 4000 model was used and the symmetrical Schlumberger configuration was adopted. Twelve (12) Vertical Electrical Sounding stations were located and fully occupied along the dam axis. Preliminary input data from the field were fed into Zohdy software to generate real resistivities and depths to geoelectric layers. Five geoelectric layers were interpreted as Loamy Top soil, Alluvial matter, Pebble bed, Sandy lateritic and Gravely sand. Layer 1 (the top loamy soil) was encountered in VES 1, 2, 3, 4, 5, 9, 10, 11 and 12 locations with maximum thickness of 1.5 m in VES 3 and 4. Resistivity values ranged from 216 to 519 Ohm-m. The second layer (lateritic matter) had a maximum lower depth of 5 m in VES 3 and 4 points. This was not encountered in VES 6 point being replaced by alluvium. Resistivity values ranged from 101 to 6190 Ohm-m. Layer 3 was interpreted as a restricted pebble bed which occurred only at VES 6, 7 and 8 locations flanking the river course with thickness of about 3.5 m and resistivity values range of 182 415 Ohm-m. The fourth layer was modeled as the alluvial matter and restricted to the river course (VES 6, 7, 8) locations with base at between 12.5 m in VES 8 and 8 m in VES 6. The last modeled layer (Layer 5) was composed of gravely sandstone that underlined the whole study area apart from the restricted pebble bed at the NE crestal portion (VES 12). No structures like fractures, lineaments and faults that would be of deleterious effect were observed in all the VES points down to about 40 m. However, it was observed that the axial length had overriding sandy matter with high porosity and

关键词： Aba River Amapu-Ideobia Dam Axis Electrical Resistivity Geoelectric

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Prevalence and Predictors of Non-Uptake of HIV Voluntary Counseling and Testing among Undergraduates of Tertiary Institution in Abia State, Nigeria

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Open Journal of Statistics 2021年第1期11卷 19-35页

作者： Prince ezenwa N. Onyemachi Madu James Awa Mazi E. C. Ejikem Juliet U. Enukeme Department of Community Medicine Abia State University Teaching Hospital Aba Abia State Nigeria Department of Community Medicine College of Medicine and Health Sciences Gregory University Uturu Abia State Nigeria Department of Obstetrics and Gynaecology Abia State University Teaching Hospital Aba Abia State Nigeria

Background: One of the key strategies in the HIV/AIDS prevention and control programs in Nigeria is Voluntary HIV counseling and testing (VCT). However, its utilization among young adults, particularly undergraduates, is very low. The aim of the present study was to determine the prevalence and predictors of non-uptake of VCT among undergraduates. Methods: A cross sectional study using quantitative methods was conducted. Using simple random sampling, three faculties were selected out of nine and 422 respondents were selected from three faculties. Interviews were conducted using pre-tested semi-structured questionnaires. Data analysis was done using statistical package for social sciences version 20. Prevalence was measured by the percentage of respondents that had never used VCT. Analytical statistics were done using chi-square test to measure strength of association between VCT uptake and knowledge and attitude of respondents. Association with P-value 0.05 was considered significant. Logistic regression was used to identify predictors of non-uptake of VCT. The associations were presented as odds ratios (OR) and 95% confidence intervals. Results: Overall, 59.3% of respondents were knowledgeable about VCT while majority, 64.7% had negative attitude towards it. Knowledge (X2 = 9.89, P-value 2 = 10.78, P-

关键词： Prevalence Predictors VCT Non-Uptake Tertiary Institution Abia State

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