Foundation Settlement Determination: A Simplified Approach

The heterogeneous nature of the subsurface requires the use of factual information to deal with rather than assumptions or generalized equations. Therefore, there is need to determine the actual rate of settlement possible in the soil before structures are built on it. This information will help in determining the type of foundation design and the kind of reinforcement that will be necessary in constructions. This paper presents a simplified and a faster approach for determining foundation settlement in any type of soil using real field data acquired from seismic refraction techniques and cone penetration tests. This approach was also able to determine the depth of settlement of each strata of soil. The results obtained revealed the different settlement time and depth of settlement possible

Review of Sexuality Studies in Africa: Setting a New Post-2015 Research Agenda

At the nexus between reproductive health, population and development is the subject of sexuality which has generated extensive discourse in the past two decades. In this paper, we review Africa sexuality studies published between 1994 and 2015 with the aim of synthesizing the available evidence and suggesting a new research agenda for post-2015. Review findings showed that previous studies covered the five components of sexuality – practices, partners, pleasure/pressure/pain, procreation and power to different extents. Risky sexual behaviour was prevalent from adolescence till older ages. Literature on pleasure, pain, procreation and power reflect the complex diversity driven by traditional norms, gender roles and attitudes across the continent. Knowledge gaps were highlighted and new agenda suggested for sexuality research.Keywords: sexual behaviour, sexual violence, sexual pleasure/satisfaction, gender roles, socio-cultural norms, sub-Saharan Africa

Application of Shallow Seismic Refraction Method and Geotechnical Parameters in Site Characterization of a Reclaimed Land

The recent incessant cases of building collapse have made it necessary for building site to be characterized before they are developed especially when the land is reclaimed from water bodies. On the basis of the above, both geophysical and geotechnical methods are engaged to determine the subsurface structure of a land for construction purposes. In this research effort, near surface seismic refraction method together with relevant geotechnical methods were used to characterize the subsurface condition of the study site. Nine seismic refraction profiles were surveyed with some of the profiles laid parallel and some others overlain one another. The result of this study revealed three geologic layers in the site with varying geotechnical parameters. The Young’s modulus, bulk modulus and shear modulus all have values that ranges from 0.071-25.685, 0.083-30.042 and 0.0286-10.395 GPa respectively in the site. From these results, it can be concluded the third layer having the highest value of geotechnical parameters is the most competent and this layer is between 7.5 m and 18 m into the subsurface. The information obtained from other geotechnical methods in the site confirmed the results of this study. Thus, near surface seismic refraction method is recommended for a non-invasive, non-cumbersome and reliable site characterizatio

Application of Geophysical and Geotechnical Methods to Determine the Geotechnical Characteristics of a Reclaimed Land

Near-surface seismic refraction method and electrical resistivity methods were used to characterise the subsurface of a site reclaimed from water bodies, in order to determine the depth to the most competent layer for construction purposes. Nine seismic refraction profiles were surveyed and the data was interpreted using SeisImager software package. Also, twelve vertical electrical soundings were carried out and the acquired data was interpreted using WinResist computer package. The seismic refraction method delineated three layers while the electrical resistivity method revealed between four and five geoelectric layers. The result of the seismic refraction method showed that the third layer is the most competent layer having the highest elastic moduli. Furthermore, the resistivity method revealed that the third geoelectric layer is the most competent having resistivity ranging between 23.3 and 1107.2m . It was also discovered that the depth to the most competent layer is between 7 m and 18 m in the subsurface. It was concluded that piling will be the most appropriate foundation for any building in the study area

New trends in under-five mortality determinants and their effects on child survival in Nigeria: A review of childhood mortality data from 1990-2008

Under-five mortality in Nigeria has been reported to be on the decline, but the dynamics are yet to receive adequate attention. Thus the main objective of this study was to assess these factors and quantify their relative contributions to under-five mortality between 1990 and 2008. The Nigeria Demographic and Health Survey data for 1990, 2003 and 2008 were re-analysed to assess the trends in determinants of under-five mortality.Cox Regression model was applied to determine the relative contributions of each factor to the under-five mortality risk.The results showed there were improvements in maternal education (8.6%), childhood vaccination (17.7%), use of oral rehydration therapy (13.9%) and medical treatment of childhood illnesses(17.5%) over the 19-year period. There were declines in proportions with birth interval less than 24months (3.9%), access to improved sources of drinking water (24.2%), improved toilet facilities (9.0%) antenatal care (4.5%), skilled delivery (3.0%) while maternal age at childbirth remained unchanged. These factors increased the death hazards by 4.6% between 1990-2003 but decreased them by 12% between 2003 and 2008. It was concluded that Nigeria has recorded very minimal improvements in birth spacing and antenatal/delivery care. Poor access to potable drinking water and sewage disposal, and short birth intervals,are among the factors fueling childhood mortality risks. Further improvements in these environmental and health practices as well as other factors are recommended as strategies for promoting child survival in Nigeria

Does female autonomy affect contraceptive use among women in northern Nigeria?

Literature identified female empowerment as a predictor of positive health behaviour. However, in the context of conservative and traditional society, this is yet to be explored. This paper explores the role of female autonomy in contraceptive use among currently married women in northern Nigeria. Nationally representative Nigeria Demographic and Health Survey (NDHS, 2013) data for 18,534 currently married women in northern Nigeria was analysed. Complimentary log-logistic regression (cloglog) was used to analyse the data. Current use of modern contraceptive was 6.6% among currently married women in northern Nigeria. Results show that female autonomy was significantly associated with modern contraceptive use. Respondents‘ education, wealth status and desire for no more children were associated with higher contraceptive use. Despite the conservative and religious context of northern Nigeria, female autonomy significantly predicts modern contraceptive use. Thus, empowering women in northern Nigeria, especially by education, will enable them to participate in healthy contraceptive decision making.Keywords: Female autonomy; Contraceptive; Reproductive health; northern Nigeria; Sustainable Development Goa

Shifts in age pattern, timing of childbearing and trend in fertility level across six regions of Nigeria: Nigeria Demographic and Health Surveys from 2003-2018.

Nigeria's population is projected to increase from 200 million in 2019 to 450 million in 2050 if the fertility level remains at the current level. Thus, we examined the shifts in the age pattern of fertility, timing of childbearing and trend in fertility levels from 2003 and 2018 across six regions of Nigeria. This study utilised the 2003, 2008, 2013, and 2018 Nigeria Demographic and Health Survey datasets. Each survey was a cross-sectional population-based design, and a two-stage cluster sampling technique was used to select women aged 15-49 years. The changes in the timing of childbearing were examined by calculating the corresponding mean ages at the birth of different birth orders for each birth order separately to adjust the Quantum effect for births. The Gompertz Relational Model was used to examine the age pattern of fertility and refined fertility level. In Nigeria, it was observed that there was a minimal decline in mean children ever born (CEB) between 2003 and 2018 across all maternal age groups except aged 20-24 years. The pattern of mean CEB by the age of mothers was the same across the Nigeria regions except in North West. Nigeria's mean number of CEB to women aged 40-49 in 2003, 2008, 2013 and 2018 surveys was 6.7, 6.6, 6.3 and 6.1, respectively. The mean age (years) at first birth marginally increased from 21.3 in 2003 to 22.5 in 2018. In 2003, the mean age at first birth was highest in South East (24.3) and lowest in North East (19.4); while South West had the highest (24.4) and both North East and North West had the lowest (20.2) in 2018. Similar age patterns of fertility existed between 2003 and 2018 across the regions. Nigeria's estimated total fertility level for 2003, 2008, 2013 and 2018 was 6.1, 6.1, 5.9 and 5.7, respectively. The findings showed a reducing but slow fertility declines in Nigeria. The decline varied substantially across the regions. For a downward change in the level of fertility, policies that will constrict the spread of fertility distribution across the region in Nigeria must urgently be put in place. [Abstract copyright: Copyright: © 2023 Olowolafe et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Gender variation in self-reported likelihood of HIV infection in comparison with HIV test results in rural and urban Nigeria

<p>Abstract</p> <p>Background</p> <p>Behaviour change which is highly influenced by risk perception is a major challenge that HIV prevention efforts need to confront. In this study, we examined the validity of self-reported likelihood of HIV infection among rural and urban reproductive age group Nigerians.</p> <p>Methods</p> <p>This is a cross-sectional study of a nationally representative sample of Nigerians. We investigated the concordance between self-reported likelihood of HIV and actual results of HIV test. Multivariate logistic regression analysis was used to assess whether selected respondents' characteristics affect the validity of self-reports.</p> <p>Results</p> <p>The HIV prevalence in the urban population was 3.8% (3.1% among males and 4.6% among females) and 3.5% in the rural areas (3.4% among males and 3.7% among females). Almost all the respondents who claimed they have high chances of being infected with HIV actually tested negative (91.6% in urban and 97.9% in rural areas). In contrast, only 8.5% in urban areas and 2.1% in rural areas, of those who claimed high chances of been HIV infected were actually HIV positive. About 2.9% and 4.3% from urban and rural areas respectively tested positive although they claimed very low chances of HIV infection. Age, gender, education and residence are factors associated with validity of respondents' self-perceived risk of HIV infection.</p> <p>Conclusion</p> <p>Self-perceived HIV risk is poorly sensitive and moderately specific in the prediction of HIV status. There are differences in the validity of self-perceived risk of HIV across rural and urban populations.</p

Application of 2D electrical resistivity imaging and cone penetration test (CPT) to assess the harzadous effect of near surface water on foundations in Lagos Nigeria

Adequate information on the condition of the subsurface is very important for site evaluation for engineering purposes. In this study two dimensional (2D) geoelectrical resistivity survey and cone penetration tests were conducted to study the hazardous effect of excess near surface water on the foundation of building in a reclaimed land located at Victoria Island area of Lagos State. The results of the inverted 2D geoelectrical resistivity data revealed three distinct geoelectrical layers characterized by low to moderate electrical resistivity of 2.23 and 129 Ωm and 9.46 to 636 Ωm respectively. The topsoil is characterized by wet sandy soil, which is underlain by sandy clay and banded at the below by a geologic formation of low resistivity which is suspected to be clay. The clay material may be responsible for the excess water retention observed in the area. The CPT method on the other hand revealed a geological formation of low resistance to penetration between 2-3 kg/cm2 from the topsoil to a depth of 7 m, which may be the effect of excess water in the near surface. This study revealed that the foundation of building may not be founded directly on the soil in any reclaimed land as this may result in collapse as a result of upward migration of water to the near surfac