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Item Diagnosing Government Responsibilities in the Implementation of Public-Private Partnership System for Infrastructure Procurement(International Journal of Sustainable Development and Planning Vol. 20, No. 6, 2025-06) Ojelabi, Rapheal A.; Oyenubi, Adebayo; Oyeyipo, OpeyemiPublic-Private Procurement is a system that allows for collaboration between the government and private partners in infrastructure provision. However, researchers argued that the successful implementation of the procurement option rested more on the government's shoulders. Hence, the study aims to identify critical government roles and investigate their importance and performance in PPP projects in Nigeria using a survey approach. The targeted respondents are PPP stakeholders operating in Lagos and Abuja. However, due to the absence of comprehensive lists of the PPP stakeholders involved in PPP projects in Nigeria, a project based approach was used in attaining the representative samples for the study, including contractors, consultants, concessionaires, government agencies, and financiers. About 384 copies of questionnaires were randomly distributed to the sample representatives, and 274 copies were retrieved. The data generated were analyzed using descriptive and inferential statistical tools. Findings showed that all the roles identified are critical and showed significant interrelationships with each other. However, the government's performance in the highlighted roles is unsatisfactory, and recommendations were made on its shortfall.Item Adoption and Barriers of Engineered Bamboo Products in the Nigerian Construction Industry(Civil Engineering and Architecture 13(2), 2025) Ojelabi, Rapheal A.; Omuh, Ignatius O.; Amusan, Lekan M; Ogunrinde, OlugbenroThe rise in the cost of conventional construction materials and the greenhouse effect from construction activities have been an issue of concern to stakeholders in the construction industry. Hence, efforts have been concentrated on developing low-cost, environmentally friendly and sustainable local materials to mitigate the greenhouse effect. The quest for the sustainable materials necessitates the study to examine the prospects of adoption of engineered bamboo products and the challenges militating against its use among construction professionals. A quantitative approach was adopted and 70 questionnaires were distributed among construction professionals with structural engineering background in selected firms across Lagos State. Data collected were processed using percentage, mean item score and Kruskal Wallis’s test. Facts garnered from the study revealed that engineered bamboo adoption for construction related works like ceiling, flooring, and reinforcement among others is not outstanding. The poor implementation of the engineered bamboo products is attributed to some challenges which include ‘high affinity for conventional materials’, ‘unavailability of bamboo products’ and ‘lack of machinery to refine raw bamboo’ among others. Therefore, the study recommends that stakeholders need to channel more resources into research and development and creating an enabling policy that can enhance the bamboo products adoption.Item Disparities in Allostatic Load Among Different Races: A Comprehensive Scoping Review(Springer, 2025) Rotimi, Oluwakemi Anuoluwapo; Olowokere, Olanike Gloria; Olasehinde, Olutola Esther; Bisi‑Adeniyi, Titilayo Ifeoluwa; Onyia, Abimbola Fatima; De Campos, Opeyemi Christiana; Rotimi, Solomon OladapoBackground Allostatic load measures the cumulative stress, and it varies across populations. Its accurate measurement among racial groups is essential for understanding the effects of chronic stress on health. This review is aimed at investigat ing disparities in allostatic load between races and exploring the underlying mechanisms driving these disparities. Methods A systematic search of literature was conducted, resulting in the inclusion of 296 relevant studies. These studies investigated a wide range of allostatic load biomarkers from the cardiovascular, metabolic, neuroendocrine, and immune systems. They involved diverse racial and ethnic populations with variations in age, gender, socioeconomic status (SES), and stress exposure. Results The review revealed disparities in allostatic load biomarkers across different population groups. The extensive examination of a wide range of biomarkers in the selected studies showed systolic and diastolic blood pressure (DBP), heart rate/pulse rate, high-density lipoprotein cholesterol, glycosylated hemoglobin (HbA1c), body mass index, total cholesterol (TC), C-reactive protein, and interleukin-6 (IL-6)/IL-6 receptor as the most frequently used biomarkers across populations. Socioeconomic status, age, racial discrimination, stressful life events, and adverse health outcomes were associated with allostatic load across different racial groups. Conclusion Disparities exist in previous studies on allostatic load due to differences in biomarker inclusion, calculation methods, study types, and populations studied. In addition, the roles of factors like social determinants of health, discrimi nation, and constitutive factors like genetics and age were discussed.Item Delineation of structural lineaments of Shaki West Southwestern Nigeria using high resolution aeromagnetic data(Nigerian Society of Physics Science, 2025) Adedokun, O. M.; Oladejo, O. P.; Alao, K. N.; Otobrisec, H.; Suleman, K. O.; Adedokun, O.; Sunmonu, L. A.A minor earthquake, known as earth tremor, often occurs in areas prone to seismic activity. However, there is a notable gap in knowledge about earth tremors, with little documentation conducted before 1987, but a series of notable events between 1990 and 2000 prompted researchers to delve deeper into the study of earth tremors in Nigeria. Therefore, this study is aimed at delineating the structural lineaments of Shaki West Southwestern Nigeria using High Resolution Aeromagnetic Data (HRAD) to identify the underlying basement geology and define the structural framework of the study area. The study area’s aeromagnetic data of Shaki (Sheet 199) underwent processing and interpretation using Oasis Montaj software to assess basement configuration and structural integrity. The data were further enhanced using the Total Horizontal Derivative (THDR) in order to determine the orientations of the lineaments in the study area. The orientations of the lineaments obtained from THDR map revealed that the Pan African orogeny constitutes 52%; Kibaran orogeny constitutes 31%, while Liberian orogeny constitutes 17% lineaments in the study area. The upward continuation maps suggest the presence of faults at the depth range of 2.0-2.25 km. The overall depth to magnetic sources of the area is relatively shallow compared to sedimentary basement area. Based on orientation of faults on magnetic fault map obtained from the superposition of the lineaments extracted from THDR map on the geological map of the study area, three distinct set of sinistral /dextral faults were recognized in Shaki west local government area which includes: E-W, NE-SW and NW-SE fault trend. This suggests that NE-SW and NE-SE fault-set could be responsible for the tremor experienced in Shaki west southwestern, Nigeria. It is concluded that the study area is not immune from experiencing occurrences of tremors from time to time.Item Practice and theoretical analysis of ground penetrating radar in voids detection of urban underground pipe-jacking(Elsevier Inc., 2025) Adagunodo, Theophilus Aanuoluwa; Hu, Fengming; Yang, Tianchun; Zhu, Debing; Huang, RuiPipe-jacking construction technology has become more prevalent with the development of urbanization. At the same time, non-destructive detection of the compactness around the pipe-jacking is a necessary step in the pipe jacking engineering. Therefore, the present study intends to explore the non-destructive detection of pipe-jacking quality by using ground penetrating radar. Ground penetrating radar can also be called GPR for short, and it plays an irreplaceable role in our life through its efficient and nondestructive detection function. In the study, void models for plastic jacking pipes, reinforced concrete jacking pipes, and steel jacking pipes were constructed, and forward simulations of ground penetrating radar were conducted using the two-dimensional finite element method to investigate the parameter influences brought about by seasonal changes and the shape of the voids; furthermore, combined with the sewage jacking pipe project in Xiangtan City, Hunan Province, practical detection and experimental research on reinforced concrete jacking pipes and steel jacking pipes are carried out using ground penetrating radar. The research results indicate that ground penetrating radar is feasible for detecting the density conditions around cement jacking pipes, plastic jacking pipes, and reinforced concrete jacking pipes. However, when detecting the void conditions around steel jacking pipes, strong multiple re flections occur between the radar antenna and the pipe wall, making it impossible to achieve the goal of detecting the density behind the jacking pipe. Therefore, future research is needed to develop new methods and technologies for assessing the construction quality of steel jacking pipes.Item Geospatial mapping of radon concentrations and uncertainties in radiological risk assessments using probabilistic modelling: the case of Ibadan(Springer, 2026) Adagunodo, Theophilus Aanuoluwa; Aremu, Abraham Adewale; Adewoye, Abosede Olufunmi; Oladapo, Olukunle Olaonipekun; Orosun, Muyiwa Michael; Ajibade, Oluwadamilola Ayoola; Muzammil, Khursheed; Zahrani, YousefRadon is a primary source of internal radiation exposure, occurring via inhalation and ingestion. This study investigates the distributions and radiological hazards of soil radon and groundwater radon in Ibadan, a major city in Nigeria. Radon concentrations were measured at 41 sites using a RAD7 detection system. The geospatial distribution was mapped using Surfer 10 software, and health risks were assessed via Monte Carlo simulations (MCS). Soil radon concentrations ranged from 1.75 to 47.24 kBq/m3 (mean: 22.30±14.48 kBq/m3 ), while water radon concentrations ranged from 1.12 to 30.48 Bq/L (mean: 14.17±8.80 Bq/L). The average soil radon level falls below the ICRP limit (40 kBq/ m3), but the average water radon exceeded the EPA limit of 11.1 Bq/L. A strong Spearman rank corre lation of 0.96 was observed between the two media. Geospatial analysis identified Class III hotspots (e.g., Pegba and Oranyan) as priority areas for local miti gation. The MCS quantified the probabilistic health burden, revealing a grand excess lifetime cancer risk ranging from 0.007×10⁻(found in the worst-case scenario at Oranyan) with an average mean of 0.605×10⁻3 . Notably, the maximum probable risk in high-exposure hotspots remains below the ICRP reference level of 3.75×10⁻3, suggesting that while the risk is significant, it does not exceed the international threshold for emergency intervention. These findings underscore the necessity of targeted intervention to manage long-term radio logical health implications for the population.Item Simulation of the Telluric Electrical Field Frequency Selection Method and Its Application in Mineral Water Exploration(MDPI, Basel, Switzerland, 2025) Adagunodo, Theophilus Aanuoluwa; Yang, Tianchun; Yang, Zhu; Qin, Qin; Zhu, MaoyueIn practical engineering geophysics, anomalous bodies are typically three-dimensional (3-D) structures, making it inaccurate to represent the subsurface geoelectric model using a two-dimensional (2-D) assumption. Furthermore, the underlying mechanism of the telluric electrical field frequency selection method (TEFSM) remains insufficiently understood. To address these limitations, this study presents a 3-D forward modeling algorithm based on the edge-based finite element method to solve the TEFSM forward problem. This paper also investigates the application of TEFSM in mineral water exploration, striving to minimize the influence of strong electromagnetic interference sources such as high voltage power lines. Specifically, the paper presents the forward theory of TEFSM and analyzes the causes of galvanic distortion, particularly static shift. Numerical simulations examine the response characteristics of anomalous bodies and the influence of galvanic distortion. The results indicate that galvanic distortion enhances shallow local anomalies in the modulus of the electric field while masking deeper targets. In contrast, the phase of the electric field effectively reflects deeper anomalous bodies and is minimally affected by galvanic distortion. Future improvements in frequency selectors may enable reliable phase measurements, thereby enhancing data interpretability. Subsequently, the TEFSM was applied to field data collected during mineral water exploration. The field test results confirm the effectiveness of TEFSM and demonstrate that it is a portable, simple, low-cost, and highly efficient method for groundwater detection.Item Causes and Possible Solutions to Road Failure in Nigeria(Springer Nature Singapore Pte Ltd., 2025) Adagunodo, Theophilus Aanuoluwa; Adeniji, Adetunji Ayokunnu; Okeniyi, Elizabeth ToyinCracks, defects and potholes characterize Nigerian roads. It is difficult to travel a long kilometer without coming across defects on the road, which has resulted in severe challenges and fatal accidents in Nigeria. The individual road has its life expectancy. In most cases, some roads fail before the expected service life. Some failures are noticed immediately after construction, some are observed after flood ing, and some failures are revealed as a result of a poor drainage system, while a few others could serve their purpose and life expectancy as a result of adequate mainte nance. In Nigeria, transportation via road is an inexpensive and efficient means of transportation for the masses as other transport systems are too expensive or not mature for commercial services. In most cases, the presence of unrestrained axle loads on most of the road networks in Nigeria has resulted in a reduction in the life expectancy of these roads. This chapter briefly reviews the causes of road failure in Nigeria and possible solutions.Item Geoelectrical resistivity imaging as a reliable input for building sustainable agroecological models: a case in southwestern Nigeria(Springer, 2025) Oyeyemi, Kehinde D.; Shiv Mangal Gupta2; Prawan Koppula; Kushal Pal Singhing issues such as diminishing soil fertility and insufficient crop yield. Geoelectrical resistivity imaging serves as a valuable tool for constructing enduring agroecological models. This research presents findings of the application of geoelectrical resistivity imaging to evaluate the agricultural soil quality in terms of nutrients, moisture levels, and organic matter content. Five parallel 100-m-length 2D electrical resistivity tomography (ERT) profiles were conducted, with a minimum spacing of 5 m and reaching a maximum depth of six levels (30 m). Additionally, soil parameters and nutrient content of twenty soil samples from the study area were analyzed to assess the soil fertility level for agricultural practice. The results revealed that the subsoil can be categorized into three geoelectrical units based on inverse model resistivity values: water-saturated soils (5–20 Ωm), moist soils (21–80 Ωm), and dry soils (>100 Ωm). The near-surface subsoils up to about 10 m exhibit higher moisture content, indicating potentially enhanced soil fertility due to improved water availability for plant growth and nutrient uptake. Measured soil parameters reveal ranges of organic matter content (41–98%), electrical conductivity (0.15–0.48 dS/m), and pH values (4.11–8.11). Furthermore, the concentrations of microelements within the near-surface subsoils samples were measured, showing ranges of 176–315 ppm for nitrogen, 25.78–99.78 ppm for phosphorus, and 149–605 ppm for potassium. This study highlights the significance and effectiveness of the geoelectrical resistivity method in evaluating soil fertility for precision agriculture purposes. The method strengthens the core of agroecological models by offering vital subsurface and spatial insights. It empowers well-informed decision-making, supports the practice of sustainable land management, and actively fosters the growth of robust agricultural systems.Item Construction Craftspeople Apprenticeship in Nigeria: From the Lens of Apprentices(Routledge; Taylor & Francis, 2026) Tunji-Olayeni, Patience; Adah, Christiana Ada; Daniel, Emmanuel Itodo; Aghimien, DouglasThe construction industry is facing a shortage of skilled workers worldwide. This shortfall can be addressed through the construction craftspeople apprenticeship system, which has not received significant attention in developing countries like Nigeria. This study aims to explore the experiences of apprentices in construction craftspeople apprenticeship programs in Nigeria. Data were collected using questionnaire surveys and interviews. Astructured questionnaire was distributed to thirty-two apprentices across two construction craftspeople apprentice ship programs in Nigeria, and sixteen interviews were conducted. The survey data were analyzed using the Relative Importance Index (RII), while data from the interview were analyzed using content analysis to identify key themes. The findings revealed that the primary motivators for individuals to pursue apprenticeships in the construction sector include the desire to work in the construction industry, the opportunity for skills and ability development, and the opportunity for income and associated benefits. Conversely, the major challenges faced by apprentices include limited job availability after completing their apprentice ship, poor or nonpayment of allowances, redundancy during training and inadequate training quality. These findings are significant for con struction stakeholders as they highlight the need for strategies to encourage young people to engage in apprenticeship training while addressing the challenges faced by apprentices.