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NEIGHBOURHOOD DEGENERATION AND ITS EFFECTS ON RESIDENTIAL PROPERTY VALUES (Case Study of New Oko-Oba, Agege Local Government Area, Lagos)
(Covenant University Ota, 2012-05) OGUNSEITAN, Flourish Oluwabukola; Covenant University Project
Although, there are many factors that affect residential property values in different areas of the world, ranging from social factors to institutional factors, the researcher however foc used more on how neighborhood degeneration affects residential property value in New Oko-Oba Agege, Lagos. The methodology used by the researcher is the ' lottery system' of the simple random sampling system after the researcher had distributed 120 questionnaires and was able to get 93 questionnaires back. Also, the frequency distribution tables, bar charts, relative importance index as well as Chi square test were used for the analysis of the data got. According to the summary of findings, poor waste disposal and traffic congestions are the major causes of neighborhood degeneration in the area. Finally, the researcher gave suitable recommendations and conclusions. It should be noted that this research is subject to further studies.
Natural and anthropogenic biomarkers in recent dated sediment cores from Refome Lake, SE Nigeria: environmental implications
(Environ Earth Sci, 2016) Oyo-Ita, Orok Esu; Oyo-Ita, Inyang Okon; Sam, Edidiong Sunday; Ikip, Ekpo Offem; Ugim, Ugim Samuel
Natural and anthropogenic biomarkers characteristics of two recent sediment cores collected toward the shoreline and center of Refome Lake (RS and RC; 30 cm long), southeastern Nigeria, were investigated in order to reconstruct past environmental conditions and asses humans-induced changes on the local ecosystem over the last century. Results from sediment bulk properties such as total organic carbon (TOC; 0.12–0.54%; mean— 0.26 ± 0.9%), total nitrogen (TN; 0.01–0.05%; mean— 0.03 ± 0.7%) and total inorganic carbon (TIC; 0.03–0.37%; mean—0.14 ± 1.0%) contents as well as TOC/TN (5–25; mean—11.55 ± 1.4) suggested slightly higher contribution from allochthonous over autochthonous organic matter (OM), lowered by low primary production and the characteristic Niger Delta sheltered basin morphology predominated by sandy lithology. Evaluation of molecular proxies such as carbon preference index (CPI(C24–C35); 1.23–1.74: mean—1.58 ± 0.4), carbon maxima (Cmax—17, 19, 26, 27, 29), long-chain/short-chain hydrocarbons (LHC/SH-C; 0.77–2.25, mean—1.52 ± 0.3) and Paq, (0.21–0.61, mean–0.45 ± 0.3) as well as C29/C27 (0.89–2.67; mean—1.53 ± 0.2) indicated an admixture slightly predominated by microbial OM (algae/bacteria) in the most recent top layer (RC1, 0–5 cm) of RC core and slightly more enhanced terrestrially derived OM in the middle layer (RS4, 15–20 cm) of RS core. The later sediment layer deposited at ca. 1947–1964 coincided with the period of greater wash-in of land-derived OM (associated with tree logging/forest clearing for foot path extension and farmland preparation authorized by the European settlers) occasioned by intense rainfall. The occurrence of gammacerane and 18a-oleanane in low levels in the lower and upper layers revealed trace contamination by petroleum hydrocarbons imported into the Nigerian economy prior to independence in 1960 and utilization of Niger Delta oil after 1960 following departure of the colonial masters (the British), respectively.
PROJECT MANAGEMENT COMPETENCIES OF INDIGENOUS CONTRACTORS IN NIGERIA
(2016) Tunji-Olayeni, Patience; Mosaku, Timothy O.; Fagbenle, Olabosipo I.; Amusan, Lekan M.
All over the world, governments are talking about reducing spending of capital and recurrent expenditures. Capital expenditures cover cost for major projects such as infrastructure. Moreover, the wealth and worth of a nation is a function of the availability and quality of its infrastructure. It has been noted that indigenous construction firms do not represent a strong source of competition. Consequently, most construction markets in Africa are dominated by expatriates. Governments of most African countries pay huge amount of money to expatriates because of deficiencies in indigenous capacity. This study therefore, identifies and analyses project management competencies required by indigenous construction firms. A quantitative research method was adopted for the study and 72 questionnaires were distributed to indigenous construction firms in Lagos and Abuja, Nigeria. This study revealed cost management, site management, and time management as the most critical project management competencies of indigenous contractors surveyed. The study further revealed that the critical PM competencies of contractors surveyed are hard/technical competencies. The study recommends that indigenous contractors should in addition to hard competencies develop soft/personal competencies which can also facilitate the achievement of project success.
Evaluating Construction Project Performance: A Case of Construction SMEs in Lagos, Nigeria
(IBIMA Publishing, 2016) Tunji-Olayeni, Patience; Mosaku, Timothy Olusoji; Fagbenle, Olabosipo Ishola; Omuh, Ignatius Owoicho; Joshua, Opeyemi
Performance evaluation is a vital tool for assessing management performance and formulating corporate strategies. The Nigerian construction industry is reported to be very vibrant and one of the largest in Africa. It is made up of 78% indigenous firms and 22% foreign firms. The indigenous firms are predominately small and medium – sized. However, the Nigerian construction industry have been challenged to improve its performance because of reports of performance problems in terms of cost over runs, time over runs, poor quality of work, low productivity among other problems. The aim of the study was to establish the measures used by construction SMEs for evaluating performance. The study employed a case study research design. Five construction SMEs in Lagos, Nigeria were selected as case studies. The findings revealed that construction SMEs do not use any of the established performance measurement frameworks for evaluating performance. The main performance measures used by construction SMEs are cost, time, quality, customer satisfaction, profitability of the project, labour productivity, safety and team work. It was also established from the study that construction SMEs do not use supply chain management and employee satisfaction. It was suggested that construction SMEs should also use supply chain management and employee satisfaction because these measures have been found to impact positively on firms’ performance.
Source Characterization and Historical Trend of Sedimentary PAHs from Refome Lake, South–South Nigeria
(Aquat Geochem, 2017) Oyo-Ita, Inyang O.; Oyo-Ita, Orok E.; Ikip, Ekpo O.; Sam, Edidiong S.; Ugim, Ugim S.
Polycyclic aromatic hydrocarbons (PAHs) released from diverse sources passing through water column carry information into the sediment where they can be used to assess the environmental status of an ecosystem over specified geologic time frame. The vertical distributions of PAHs in two recent sediment cores (RS and RC, 30 cm long) from Refome Lake, South–South Nigeria,were investigated using gas chromatography–mass spectrometry in order to evaluate their sources and historical trends of deposition over the last ca. century. The total PAHs (TPAHs—sum of parent and retene) concentrations ranged from 66.99 ng/g dry weight (dw) at the middle layer ofRCcore (RC3 10–15 cm) to 182.24 ng/gdwat the near-bottomlayer of RS core (RS5 20–25 cm) with amean of 102.21 ± 24.32 ng/g. The elevated TPAH level at the near-bottom layer of the RS core, corresponding to geologic time-frame ca. 1930–1947, coincided with the period of inhabitation of the European settlers along the lake’s catchments when utilization of coal and/or coal products for domestic/recreational activity was at its peak. A decline in TPAH levels up-cores thereafter reflected the periods of gradual evacuation of inhabitants of the lake area hinterland following the departure of theWhite after the Nigerian independence in 1960. Evaluation of PAH category according to ring size coupled with data from specific molecular ratios revealed inputs dominated by wood/coal combustion with a moderate contribution from petrochemical/liquid fossil fuel exhaust emissions and a minor diagenetic sources. Principal component analysis result not only distinctively separated RS fromRCcore samples but also revealed that the RS samples weremore impacted by wood/coal combustion emissions than the RC, while liquid fossil fuel exhaust emission dominated the RC over the RS samples. Although short-range eolian transport did play a role in the delivery of PAHs to the lake, localization of source contamination was more important.
Determination Of Nutritional Potential Of Cymbopogon Citratus (D.C.) Staph By Atomic Absorption Spectroscopy And Its Health Benefits
(International Journal of Innovative Research and Advanced Studies (IJIRAS) Volume 5 Issue 3,, 2018) Umoh, Emmanuel Michael; Sam, Edidiong Sunday; Udoh, I. I.
Lemon grass (Cymbopogon citratus) was processed for analyses. They were sorted and chopped into bits. They were sundried for 12hrs, oven dried for 24hrs at 60oC and pulverized. Digestion was carried out according to AOAC 2000 and analysed for P, Mg, K, Na, Se, B, Co, Fe, Zn, Mn, Cu and Ca contents using Unicam 939/959 Atomic Absorption Spectrophotometer. Out of these twelve “botanical based minerals”, the most abundant was potassium followed by magnesium, phosphorus and calcium the least being boron. Most nutritional problems in Nigeria experienced by the vulnerable groups - the children and the elderly are due to mineral deficiencies in unwholesome or processed foods. Minerals usually obtained from synthetic mineral supplements are inadequate for the rural population due to high cost of procurement and at times adulteration. Most of them are toxic to susceptible individuals. Lemon grass is very effective in „Ajurvedic‟ medicine because of the “botanical based minerals” and bioactive compounds therefore taken in adequate quantities will help in the improvement of general health.
USE OF EARLY WARNING SYSTEMS, A FRAMEWORK FOR SAFETY IN BUILDINGS: EMPIRICAL STUDY
(International Journal of Mechanical Engineering and Technolog, 2018) Ogunde, Ayodeji O.; UGWU, Chinedu. A.; Adeboye , Albert; Oloyede, Samuel .A.; Durodola, Daniel. O.; AYEDUN, Caleb .A.
The study assessed the use of Early Warning Systems [EWS] towards framework for safety in buildings: Empirical Study. Both Qualitative data and Quantitative data were obtained. The survey method was used in this study for generating data through the administration of questionnaires to both commercial and residential building occupants in Lagos state, Nigeria. . Descriptive Statistics was used for data analysis through Survey gizmo and Microsoft excel. The result showed that the implementation and adoption of early warning systems is much more economical than neglecting the systems and then paying for damages after the disaster has occurred. It concluded that the emergency escape frame work of a building will be more effective if Early Warning Systems are installed. It recommended that government should endeavour to ensure that a standard code is introduced and reviewed to ensure the incorporation of the use of Early Warning Systems. The public should be enlightened on Early Warning Systems for different types of buildings and their benefits. Moreover, some of the systems have to be implemented on a community based scale such as a flood warning system.
Survey dataset on work-life conflict of women in the construction industry
(Elsevier Inc., 2018) Tunji-Olayeni, Patience; Afolabi, Adedeji O.; Adewale, Bukola A. A; Fagbenle, Ayoola O. F
cularly for women who have to work in order to support their families financially. The data set presents the views of 50 female construction professionals in Lagos, Nigeria through a purposive sampling techni que with the aid of questionnaire. Categorical Regression was used to assess the effect of work pressure on family expectations. The features of the respondents in terms of profession, years of experience, office location and household characteristics were presented in bar chart. Analysis of the data can provide information on the work experiences of women in the construction industry particularly work load, hours worked per day, work on weekends and work on holidays. The data can also provide insights on the family expectations that are significantly affected by work pressure.
The Recycling of Sawdust Waste into Particleboard Using Starch- Based Modified Adhesive
(Communication in Physical Sciences, 6(1), 2020) Umoh, Emmanuel Michael; Sam, Edidiong Sunday
The challenges associated with the management of wastes from the cassava processing and timber industries necessitated an investigation into the possibility of implementing recycling approach to produced particle board from these wastes. Particleboards were produced from wood saw dust using various compositions of modified starch adhesives. The product obtained were evaluated for density, moisture content, hardness, flexural strength, water absorption and thickness swelling. The results obtained indicated that the density ranged from 753 to 798 kg/m3, moisture content ranged from 14.87 to 16.67 %, hardness ranged from 9.02 to 9.31 N/nm2, flexural strength ranged from 1.31 to 1.45 MPa, water absorption capacity at 24 h ranged from 1.06 to 9.31 %, thickness swelling ranged from 4.55 to 4.78%. The products were in conformity with IS 3087 (2005) and ANSI A 208.1 (1993) standards and could go for medium density particleboard.
VAPOUR GENERATION CHEMILUMINESCENCE DETECTION SYSTEM FOR DETERMINATION OF DIMETHYLSULPHONIOPROPIONATE AND DIMETHYLSULPHIDE IN TROPICAL SEAWATER
(Rasayan J. Chem., 13(1), 44-50(2020), 2020) Adedapo, A. E.; Benson, N. U.; Williams, A. B.,; Toda, K.
The vapour generation – chemiluminescence (VG-CL) detection system that was designed for this research was used for the measurement of dimethylsulphide (DMS) and its precursor dimethylsulphoniopropionate (DMSP). The present study attempted the development of a highly sensitive, portable and cost-effective detection system based on vapour generation and chemiluminescence for a pilot assessment and determination of DMSP and DMS concentrations in the Gulf of Guinea. The Elegushi Beach and Nigerian Institute of Oceanography and Marine Research (NIOMR) which are parts of the Atlantic Ocean were chosen as designated locations for this study. The average concentrations of DMSP and DMS in the surface seawater at the two locations ranged from 12.4 ± 0.2 to 26.5 ± 0.5 nM, 2.1± 0.0 to 40.9 ± 1.6 nM and 9.7 ± 0.4 to 44.9 ± 0.2 nM, 0 to 35.6 ± 2.3 nM, respectively. This study serves as a baseline measurement of the concentrations of DMS and DMSP in the tropical Atlantic Ocean (Lagos).
Application of Nanochitosan in the Detection of Pesticide Residues and Degradation
(2020) Yakubu, Japhet Gaius; Oyewole, Oluwafemi Adebayo; Ilyasu, Ummulkhair Salamah; Ayanda, Opeyemi Isaac; Adetunji, Charles Oluwaseun
Chemicals called pesticides are used to manage pests like weeds, rodents, and insects. They are commonly used in agriculture to safeguard animals and crops from pests and illnesses. The usage of pesticides, however, can potentially have detrimental effects on the environment and public health. Pesticides can harm non-target creatures and contaminate the soil, water, and air. In addition, exposure to pesticides can result in a variety of medical issues in people, such as cancer, neurological conditions, and reproductive issues. Chitosan is a natural polymer formed from crab shells. Nanochitosan is chitosan in a nanoscale form. It has several distinctive qualities that make it a potential material for a variety of applications, including the detection and degradation of pesticides, such as large surface area, biocompatibility, and non-toxicity. There are numerous ways to detect pesticides using nanochitosan. Utilizing sensors made of nanochitosan is one typical strategy. Usually, nanochitosan is immobilized onto a substrate, like a gold electrode, or nanochitosan-based colorimetric assays are used to create these sensors. Because there is currently no environmentally benign method of pesticide remediation, scientists have looked for other ways to prevent pesticides from having a negative impact on the ecosystem. In order to degrade pesticides, nanochitosan has been used in a variety of ways. These include the usage of nanochitosan-based adsorbents, which are typically created by adding a functional group with a strong affinity for pesticides to nanochitosan. The pesticide is subsequently removed from the environment by the functional group after it attaches to it. Because nanochitosan can be impacted by environmental factors including pH and temperature, there are restrictions on its usage for bioremediation. Nanochitosan provides a number of benefits over other materials used for the detection and degradation of pesticides, notwithstanding its limits. As a result, it may be investigated to reduce the effects of pesticides on the environment.
Innovation potentials for construction materials with specific focus on the challenges in Africa
(2020) Tunji-Olayeni, Patience; Schmidt, Wolfram; Otieno, , Mike; Olonade, Kolawole Adisa; Radebe, Nonkululeko W.; Damme, Henri van; Kenai, Said; Tawiah, Angela Tetteh; Manful, Kuukuwa; Akinwale, Akeem; Mbugua, Rose N.; Rogge, Andreas
Africa is urgently in need of adequate basic infrastructure and housing, and itis one ofthe continents wheremassive construction activities are on the rise. There is a vast variety of potentially viable resourcesforsustainable construction on the continents, and consequently,the continent can bring innovative, greener technologies based on local sources effectively into practice. However, unlike established concrete constituents from industrialised countries in the global North,most ofthe innovation potentialsfromthe African continent have not yet been the focus of intensive fundamental and applied research. This clearly limits the implementation of more sustainable local technologies. This paper presents a case forthe need to first appreciate the rich diversity and versatility ofthe African continent which is often notrealistically perceived and appreciated. It discusses specific innovation potentials and challenges for cementitious materials and concrete technology based on local materials derived from sources on the African continent. The unique African materials solutions are presented and discussed, from mineral binders over chemical admixtures and fibres to reinforcement and aggregates. Due to the pressing challenges faced by Africa, with regards to population growth and urbanisation,the focusis not only put on the technological (durability,robustness and safety) and environmentalsustainability, but also strongly on socio‐economic applicability, adaptability and scalability. This includes a review of alternative, traditional and vernacular construction technologies such as materials‐saving structuresthat help reducing cementitious materials. Eventually, a strategic research roadmap is hypothesised that points out the most relevant potentials and research needsfor quick implementation of more localised construction materials.
Students’ perception of sustainable construction:
(Informa UK Limited, trading as Taylor & Francis Group, 2020) Tunji-Olayeni, Patience; Kajimo – Shakantu, Kahilu; Ayodele, Timothy O.; Philips, Bright Idara
Sustainability education for construction students provides an enduring source of indigenous capacity for tackling social, environmental and economic challenges. However, there is limited evidence on students’ perception of sustainable construction in Africa, and Nigeria in particular. This study examines students’ perceptions of sustainable construction, with a case study of a Nigerian university. The study is based on a survey research design, with the use of questionnaires. Statistical techniques such as frequency, percen tages, mean, standard deviation, ANOVA and correlation are used to analyse the data. The findings indi cate that majority of the students were not familiar with the concept of sustainable construction. However, they attached great importance to sustainable construction and were very interested in acquir ing sustainable construction knowledge. The three most common understanding of the students about sustainable construction relates to the use of renewable energy, energy efficiency and waste reduction Moreover, the findings show statistically significant differences between students’ understanding of sus tainable construction and students’ programme, academic level and gender. The findings of the study could enhance concerted efforts by the universities and accreditation agencies towards an intentional and systematic delivery of knowledge and skills that will promote sustainability literacy and transforma tions among future construction professionals in Nigeria.
Practitioners’ experiences with the drivers and practices for implementing sustainable construction in Nigeria: a qualitative assessment
(Emerald Publishing Limited, 2020) Tunji-Olayeni, Patience; Kajimo-Shakantu, Kahilu; Osunrayi, Ewaoluwa
Purpose – The purpose of this study is to assess the drivers, practices and policies for implementing sustainable construction in Nigeria. This is with a view towards increasing the rate of implementation and diffusion of sustainable construction practice, so that more Nigerians can benefit from its environmental, social and economic dividends. Design/methodology/approach – This study adopted a qualitative research design with the use of face-to face oral interviews. Interviewees were selected using a purposive sampling technique. Data from the interview were analysed using thematic analysis. Descriptive statistics of frequencies, percentages and rankings were also used to present the data and complement the thematic analysis. Findings – The study identified five major drivers of sustainable construction: clients’ demand, international pressure, corporate social responsibility, competitiveness and cost-effectiveness. The common sustainable practices adopted by the interviewees are compliance with health and safety regulation, waste management, energy efficiency and material reuse. The most appropriate policies for implementing sustainable construction as suggested by the interviewees were government regulations, provision of tax relief and subsidies and public awareness. A combination of regulatory policies, market-based policies and voluntary participation of stakeholders will enhance the attainment of sustainability transformations in the construction industry Originality/value – The study is based on the findings of construction participants who have practical experience with sustainable construction in Nigeria. The study also provides empirical evidences which could guide the design and implementation of policies that will further promote the diffusion of sustainable construction in Nigeria.
Geoelectrical Variations in Residential Area of Ojongbodu, Oyo, Southwestern Nigeria
(Nature Environment and Pollution Technology, 2020) Adagunodo, T. A.; Oladejo, O.P.
This study is aimed at mapping the geoelectrical variations in the residential area of Ojongbodu, Oyo, Nigeria. Thirty vertical electrical sounding stations were occupying across the study area using PZ-02 Earth resistivity meter. Four subsurface layers involving topsoil, two weathered layers and bedrock were mapped, with clay being the most dominating soil type in the third layer, which is about 3.9 m below the first two layers. The thickness of the third layer itself is about 10.4 m. About 70% of the bedrock is fractured. The thickness of clay in the third layer cum fractured bedrock could aid development of differential settlements in buildings or total collapse of structures within the study area.
Work-Life Experiences of Women in the Construction Industry: A Case of Women in Lagos Mainland, Nigeria
(IOP Publishing Ltd, 2021) Tunji-Olayeni, P. F.; KAJIMO-SHAKANTU, F; ONI, A. A.
The construction industry has not been able to maximize its full potentials in terms of harnessing the talents and abilities of its diverse workforce. Despite calls for a more pluralistic and inclusive workforce, the construction industry remains male-dominated, thereby limiting its growth potentials. The study examined the effects of workload on family expectations intending to support initiatives on gender equality and equity that will improve working conditions in the industry and eventually increase its performance and competitiveness. The study used questionnaires to achieve the research purpose. The survey was based on a purposive sampling of female construction professionals from different companies in Lagos Mainland, Nigeria. Descriptive statistics and linear regression were used for analysing the data. From the linear regression model, it was revealed that workload affects family responsibility at 73.20%. The significant family responsibilities affected by workload included: making alternative arrangements for children's school transportation, spending time with spouse, spending time with children, taking care of household chores, and going shopping for the family. The study focused only on female construction professionals working in the Mainland area of Lagos, Nigeria. More empirical evidence of the effects of workload on family responsibilities can be obtained by considering female professionals in other regions of Nigeria. These findings have serious implications on job fulfilment, organizational loyalty, employee retention, and organizational performance. The study recommends flexible working hours and other gender-friendly policies to attain the much desired inclusive, profitable and sustainable construction industry.
Iterative Method for Approximate-Analytical Solutions of Linear Schrödinger Equation
(IOP Publishing, 2021) Akinlabi, Grace O.; Braimah, J.A.; Abolarinwa, A.; Edeki, S.O.
In this study, the modified Picard Iterative Method (MPIM) is used to provide analytic and numerical solutions to linear Schrödinger Equations. These approximate analytical solutions for the examples under consideration are easily computed. The suggested method is employed without any transformation, discretization, linearization, or limiting assumptions. The obtained results are similar to their exact forms. As a result, the approach is highly suggested for both linear and non-linear time-space fractional partial differential models with applications in various applied disciplines.
Lipid peroxidation and activity of some antioxidative enzymes in the root of maize (Zea mays) cultivated on cadmium contamination soil
(Journal / Scientia Africana / Vol. 20, 2021-04-23) Ugbeni, O.C.; Dania, Omoremime Elizabeth; Eruotor, H.
In this study, we examined the tolerance capacity of Zea mays to cadmium pollution. Soil was treated with varied concentrations of Cadmium; 5 mg, 10 mg, 20 mg and 30 mg/kg soil and Zea mays planted. Root samples were collected in weeks 3, 4, 5 and 6. Activities of Peroxidase, catalase superoxide dismutase, and lipid peroxidation were investigated. Decrease in peroxidase activity was extremely significant (p <0.05) in weeks 4 and 5 while that of week 6 was not significantly (p > 0.05) different from normal. The decrease correlated with increase in Cadmium concentration. However, at the highest concentration of 30 mg/kg of soil the trend was not significant. Increase in the activity of catalase was recorded in weeks 3 and 6. This increase didn’t follow a particular trend but at higher concentration of Cd and long term exposure, it became apparent. There was a negative correlation between catalase activity and lipid peroxidation. In week 3, catalase activity was not significant (p > 0.05) and lipid peroxidation was significant (p < 0.05) while at week 4, catalase activity was significant (p < 0.05) and lipid peroxidation was not significant (p = 0.8432). Catalase activity was not significant (p = 0.2753) at week 5 and lipid peroxidation was significant (p = 0.0030). At week 6 when catalase activity became extremely significant (p < 0.05), lipid peroxidation had a p value of 0.0128. Generally no significant activity (p > 0.05) was observed for superoxide dismutase. A significant increase in absorption of cadmium (p = 0.0374) at 30mg/kg soil was observed between weeks 5 and 6. It was also observed that cadmium had no significant effect (p > 0.05) on the root weight during the period of study. It’s suggestive therefore Cadmium contamination of soil could affect growth of maize and induce oxidative stress.
Construction 4.0 Application: Industry 4.0, Internet of Things and Lean Construction Tools’ Application in Quality Management System of Residential Building Projects
(MDPI, Basel, Switzerland., 2022) Amusan, Lekan; Aigbavboa, Clinton; Essien, Stella; Emetere, Moses; Obaju, Biodun
The advent of Construction 4.0 has played a major role in construction industry develop ment through the improvement of quality performance. One of the parameters that have contributed immensely to the management of construction quality in the industrial revolution era is Industry 4.0, the Internet of Things (IoT), and Lean thinking concepts. Lean construction is characterized by a set of clear objectives in project delivery involving the concurrent design of products and processes. The study aims to carry out an exploratory study of the application of Construction 4.0 and Industrial 4.0 in quality management of building works and the development of Lean-based quality management models: The study engaged a survey design approach, and a random sampling technique was used to select the study samples. A structured questionnaire designed on a Likert scale 1–5 was used to collate data on the quality aspect of a construction project, and the data were used in model creation. The parameters that emerged are cast as the quality management model. The resultant factors were categorized into three (3) quality categories, which are the Zero level Defect range, Medium Quality, and High-Level Quality Range. The three (3) quality factors were recommended for adoption for quality management of residential building projects.
A censorious appraisal of the oil well acidizing corrosion inhibitors
(Journal of Petroleum Science and Engineering 215, 2022) Solomon, Moses M.; Uzoma, Ifeanyi E.; Olugbuyiro, Joseph A.O.; Ademosun, Olabisi T.
Well acidizing is a common stimulation technique for maximizing the output of oil reservoirs. It helps to overcome the low permeability of wellbore by creating new flow channels or enlarging old ones. Corrosion challenge is encountered during the process since tubings are metallic. Corrosion inhibitors are the defence mechanism used in mitigating corrosion problem during acidizing. This review has identified and grouped acidizing corrosion inhibitors into organic-, and polymer-based. The performance of these inhibitors at temperatures of ≥60 ◦C and acid concentration of ≥15 wt% is considered. It is noted that greater percentage of studies revolve round the 60 ◦C. Above 100 ◦C, the number of scientific articles decreased considerably. Four classes of intensifiers for acidizing corrosion inhibitors have been identified: formic acid, potassium iodide, copper iodide, and antimony chloride. Their chemistries have been discussed. The research gaps identified include (i) scanty information on acidizing inhibitors at temperatures ≥150 ◦C, (ii) limited information on natural polymers and plant biomaterials as acidizing inhibitors, (iii) scanty information on the mechanism of inhibition at temperatures ≥150 ◦C, and (v) limited information on the composition of corrosion products under acidizing conditions. Thus, recommendations for future researches have been given.