July 2022 Edition最新文献

SIMPLIFIED PREDICTIVE MODELS ON SUSTAINABLE LOCAL CONTENT POLICY, AND HUMAN CAPACITY DEVELOPMENTS, IN NIGERIA’S OIL AND GAS INDUSTRY. 简化了尼日利亚石油和天然气行业可持续本地内容政策和人力能力发展的预测模型。

July 2022 Edition Pub Date : 2022-06-30 DOI: 10.37703/ajoeer.org.ng/q2-2022/08

{"title":"SIMPLIFIED PREDICTIVE MODELS ON SUSTAINABLE LOCAL CONTENT POLICY, AND HUMAN CAPACITY DEVELOPMENTS, IN NIGERIA’S OIL AND GAS INDUSTRY.","authors":"","doi":"10.37703/ajoeer.org.ng/q2-2022/08","DOIUrl":"https://doi.org/10.37703/ajoeer.org.ng/q2-2022/08","url":null,"abstract":"Simplified predictive models developed to determine sustainable local content policy and human capacity development in the Nigeria’s oil and gas industry was carried out using secondary data from the Petroleum Technology Development Fund (PTDF) within ten years. The research was formulated on both descriptive and analytical statistical methods for the prediction of the expected capacity development value at optimum conditions based on critical industry need assessment and audit report between 2018 -2023 - a baseline study and the secondary data sets from PTDF trio-capacity development strategies from 2011 – 2021. From equations 2.1 – 2.11, it was established that challenging weaknesses could be turned into opportunities for the Fund. A comparative analysis of the Skills Gap Audit (SGA) and Simplified Predictive Models (SPM) was carried out using arithmetic mean, standard deviation and correlation coefficient from the assumed mean of the unclassified data. Tables 2.1 - 4.5 and Figures 2.1 and 2.6 are reference commonality data sets. The results established that more key performance indicators were captured in the SPM models (mean of 23.04 and deviation of 0.4) against the imputed values in the SGA, (mean 4.52 and deviation of 0.5) respectively. This research is useful for policy formulation and decision-making on local content policy formulations and capacity development programmes in Nigeria.\u0000Keywords: Predictive models, Sustainable local content policy, Petroleum technology Development Fund.","PeriodicalId":248787,"journal":{"name":"July 2022 Edition","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121697602","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

EVALUATION OF SEDIMENT PARTICLE SIZES OF HEAVY METAL CONTAMINATION IN THE LAGOS INLAND WATER SYSTEM. 评估拉各斯内陆水系重金属污染的沉积物粒度。

July 2022 Edition Pub Date : 2022-06-30 DOI: 10.37703/ajoeer.org.ng/q2-2022/06

{"title":"EVALUATION OF SEDIMENT PARTICLE SIZES OF HEAVY METAL CONTAMINATION IN THE LAGOS INLAND WATER SYSTEM.","authors":"","doi":"10.37703/ajoeer.org.ng/q2-2022/06","DOIUrl":"https://doi.org/10.37703/ajoeer.org.ng/q2-2022/06","url":null,"abstract":"Sediments are important in the geochemical cycles of marine and estuarine ecosystems with the ability to influence ecological processes and inhabiting biota. This study evaluated sediment particle sizes of the Lagos Harbour and inland water system with a view to determine their diversity and influence on heavy metal levels. Samples were collected using Van veen grabs, viz; dry season 2013 (DS-1), wet season 2013 (WS) and dry season 2014 (DS-2) for a period of 18 months in the Lagos Lagoon and inland water system. The sediments collected were analysed according to the British Standard (BS 1377-2, 1990) at the instrument Physical Geography Laboratory, University of Portsmouth. The mean clay, silt, course and sand were found to be 6.67± 4.51, 6.0 ± 3.0, 9.17± 3.25 and 0.37 ± 3.06 respectively. The particle size in relation with total metals/metalloids concentration in the sediment revealed positive correlation with significant differences (p<0.05) between clay and Fe (r = 0.391*), clay and Pb (r = 0.40*). While the particle size in relation and recoverable metals/metalloids concentration in the sediment revealed positive correlation with significant differences (p<0.05) between clay and Mn (r = 0.416*), silt and Mn (r = 0.414*). The particle size in relation with bioavailable metals/metalloids concentration in the sediment revealed positive correlation with were significant differences (p<0.05) between silt and Pb (r = 0.426*). This implies that the widespread dredging of the lagoon sediments and artisanal sand mining has had its toll on the structural integrity of the substratum. The strong correlation between the finer particle sizes with total, recoverable and bioavailable fractions of Fe-Mn-Pb in the sediment samples is notable and implies increased chances of retention of pollutants in the sediment matrix.\u0000Keywords: Evaluation Techniques, Inland-Lagoons, Sediment texture, Heavy metal/metalloid, Marine pollution.","PeriodicalId":248787,"journal":{"name":"July 2022 Edition","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131038201","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

UTILIZATION AND MECHANICAL PROPERTIES OF RICE HUSK AS USEFULL AGRO WASTE AND REINFORCEMENT IN COMPOSITES FABRICATION- A CRITICAL REVIEW. 稻壳作为农用废弃物的利用、力学性能及复合材料增强材料的研究进展

July 2022 Edition Pub Date : 2022-06-30 DOI: 10.37703/ajoeer.org.ng/q2-2022/01

引用次数: 0

POLYCHLORINATED BIPHENYLS (PCBS) AND HEAVY METALS CONCENTRATIONS IN BIOTA IN SOME RIVERS IN RIVERS STATE, NIGERIA. 尼日利亚河流州一些河流中生物群中的多氯联苯和重金属浓度。

July 2022 Edition Pub Date : 2022-06-30 DOI: 10.37703/ajoeer.org.ng/q2-2022/05

{"title":"POLYCHLORINATED BIPHENYLS (PCBS) AND HEAVY METALS CONCENTRATIONS IN BIOTA IN SOME RIVERS IN RIVERS STATE, NIGERIA.","authors":"","doi":"10.37703/ajoeer.org.ng/q2-2022/05","DOIUrl":"https://doi.org/10.37703/ajoeer.org.ng/q2-2022/05","url":null,"abstract":"Pollution of aquatic environments in the Niger Delta remains a major source of food chain contamination. In this study, the concentrations of heavy metals and Polychlorinated biphenyls (PCBs) in biota were determined. Standard laboratory and environmental techniques were employed in sampling and analysis of samples. Samples were collected from Borokiri, Kaa, Okrika and Eagle Island rivers. The concentrations of PCBs were determined using gas chromatography equipped with flame ionization detector (GC-FID) while heavy metals were determined using atomic absorption spectrophotometer (AAS). The results were analyzed using descriptive and inferential techniques. The results of the study showed that concentrations of PCBs in biota ranged from 0.95 – 0.98 mg/kg. Heavy metals concentrations (mg/kg) in biota ranged as 0.848- 9.719, 4.325-6.115, 5.917-9.013, 4.369-7.395, 0.619-1.462, 3.712-5.653 and 2.911-5.614 for Cd, Cu, Zn, Cr, Ba, Pb and Ni respectively. The result shows that there is a significant difference in the concentrations of the metals in biota along the locations. While the concentrations of the PCB were within regulatory limits, there is need to consistently monitor their levels as they can contaminate the food chain thereby inducing toxicities in humans.\u0000Keywords: Polychlorinated biphenyls, heavy metals, periwinkle, concentrations, food chain, contamination.\u0000African Journal of Engineering and Environment Research Vol.3(2) 2022\u0000©2022 CEFPACS Consulting Limited. www. cefpacsconsultingltd.org.ng\u0000ISSN: 2635-2974","PeriodicalId":248787,"journal":{"name":"July 2022 Edition","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123724862","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

MODELING HYDROCARBON GENERATION IN ANAMBRA BASIN, SOUTHEASTERN NIGERIA: IMPLICATIONS ON HYDROCARBON PROSPECTIVITY. 尼日利亚东南部阿南布拉盆地生烃模拟:对油气远景的影响。

July 2022 Edition Pub Date : 2022-06-30 DOI: 10.37703/ajoeer.org.ng/q2-2022/03

{"title":"MODELING HYDROCARBON GENERATION IN ANAMBRA BASIN, SOUTHEASTERN NIGERIA: IMPLICATIONS ON HYDROCARBON PROSPECTIVITY.","authors":"","doi":"10.37703/ajoeer.org.ng/q2-2022/03","DOIUrl":"https://doi.org/10.37703/ajoeer.org.ng/q2-2022/03","url":null,"abstract":"The Anambra Basin contains oil and gas producing reservoirs in the southeastern part of Nigeria. Two-dimensional (2-D) modeling, using data from three (3) exploration wells has been carried out to assess the maturity, timing, and distribution of hydrocarbon generation in the Anambra Basin. This current study focuses on two sources in Anambra Basin namely; Coniacian Agwu and Nkporo source rocks. The results of models generated indicate that the onset of hydrocarbon generation from Awgu source rock started in the area of deepest subsidence during the late Campanian (77.30Ma). Awgu source rock in the model has a present-day transformation ratio of about 60-65%. This range indicates that the Awgu source rock has sufficient generation for hydrocarbon expulsion to occur. Nkporo source rock was equally observed to have capacity for hydrocarbon generation, but the generation was insufficient for expulsion because it has lower transformation ratio (<10%). Migrated hydrocarbon from the Coniacian Awgu source rock must have accumulated as oil and gas pools within the Coniacian Agbani and upper Campanian Owelli Sandstone. The discovery of gas in the Coniacian Agbani sandstone of Amansiodo-1, Akukwa-2, and Nzam-1 wells indicates the existence of petroleum traps in Cretaceous beds of the Anambra Basin.\u0000Keywords: Two dimensional modelling, Hydrocarbon generation and expulsion, Anambra basin, Transformation ratio, Awgu and Nkporo shales ,","PeriodicalId":248787,"journal":{"name":"July 2022 Edition","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122489877","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

USE OF GLASS REINFORCED EPOXY PIPE IN PLACE OF CARBON STEEL PIPE IN NIGER DELTA. 尼日尔三角洲用玻璃增强环氧树脂管代替碳钢管。

July 2022 Edition Pub Date : 2022-06-30 DOI: 10.37703/ajoeer.org.ng/q2-2022/02

引用次数: 0

PHYSICO-CHEMICAL PROPERTIES OF BRIQUETTES FROM RICE HUSK – SAW DUST MIXTURES AND ITS ENERGY POTENTIAL IN THE RENEWABLE ENERGY MATRIX. 稻壳-锯末混合物成型块的理化性质及其在可再生能源基质中的能量潜力。

July 2022 Edition Pub Date : 2022-06-30 DOI: 10.37703/ajoeer.org.ng/q2-2022/07

{"title":"PHYSICO-CHEMICAL PROPERTIES OF BRIQUETTES FROM RICE HUSK – SAW DUST MIXTURES AND ITS ENERGY POTENTIAL IN THE RENEWABLE ENERGY MATRIX.","authors":"","doi":"10.37703/ajoeer.org.ng/q2-2022/07","DOIUrl":"https://doi.org/10.37703/ajoeer.org.ng/q2-2022/07","url":null,"abstract":"The energy potentials of briquettes produced from a mixture of rice husk and saw dust have been investigated from the physic-chemical properties under strict laboratory analysis. The parameters indicated that briquettes from rice husk and saw dust using cassava starch as binders, are reddish brown while briquettes from rice husk and saw dust with gum Arabic are dark brown in colours. Furthermore, the moisture content of briquettes from rice husk and cassava starch is lower compared to that from saw dust and cassava starch (Table 1 and 2). Under intense pressure, briquettes from rice husk and cassava starch burn at 40oC in 3minutes, while rice husk with gum Arabic burn at 54oC in 3minutes. At the ratio of 50 – 50, briquettes with gum Arabic as binders is the best in calorific values at 0.694g/sec (Table 5). Saw dust has high thermal efficiency than rice husk while starch is more combustible than gum arabic. Equations 1 and 2 are determinants in the weight measurement processes and the ratio of materials for the right proportion of rice husk and saw dust with the different binders at different times. The moisture contents and burning rates of these briquettes are fundamental to the determinations of the energy potentials as alternative renewable energy source in Nigeria, equation 2. Briquettes produced from rice husk and saw dust is compatible with fuel needs in the rural areas and makes good biomass fuel as alternative energy sources if properly harness for both domestic and industrial use. This paper therefore, is useful for policy decisions on renewable energy industrialization, energy diversification and agro-economics for environmental preservation in Nigeria.\u0000Keywords: Briquettes, Renewable Energy, Saw dust, Rice Husk, Gum Arabic.\u0000African Journal of Engineering and Environment Research Vol.3(2) 2022\u0000©2022 CEFPACS Consulting Limited. www. cefpacsconsultingltd.org.ng\u0000ISSN: 2635-2974","PeriodicalId":248787,"journal":{"name":"July 2022 Edition","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126629522","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

CRITICAL REVIEW OF BIOSURFACTANTS AND THEIR ROLE IN BIOREMEDIATION OF PETROLEUM HYDROCARBON CONTAMINANTS. 生物表面活性剂及其在石油烃污染物生物修复中的作用综述。

July 2022 Edition Pub Date : 2022-06-30 DOI: 10.37703/ajoeer.org.ng/q2-2022/04

{"title":"CRITICAL REVIEW OF BIOSURFACTANTS AND THEIR ROLE IN BIOREMEDIATION OF PETROLEUM HYDROCARBON CONTAMINANTS.","authors":"","doi":"10.37703/ajoeer.org.ng/q2-2022/04","DOIUrl":"https://doi.org/10.37703/ajoeer.org.ng/q2-2022/04","url":null,"abstract":"Biotechnological advances for the past decades have provided new surfactant production technologies. Surface active substances (biosurfactants) produced by fermentative processes have proven to be a safer and sustainable alternative to many synthetic molecules. Biosurfactants are a promising substitute due to their synthesis potential by a wide variety of microorganisms. They are a highly diverse group of structures, such as glycolipids, lipopeptides, polysaccharide-protein complexes, phospholipids, fatty acids, and neutral lipids. This diversity promotes many advantages compared to synthetic surfactants, thereby making biosurfactants a suitable choice for technological advances associated with sustainable development. Such advantages include fermentative production viability using renewable resources, effectiveness in small concentrations even under extreme conditions, selective and specific potential for several applications, lower toxicity, higher biodegradability, and better stability to physicochemical variations. Despite these benefits enumerated, they are not widely used because of the high production costs. Hence, finding cost-effective substrates is imperative to making biosurfactants an economically competitive product against synthetic surfactants. In this review, inexpensive and renewable substrates that can be used for biosurfactants production are discussed. Also, biosurfactants and their potential use in bioremediation of hydrocarbon contaminants, and effectiveness in bioremediation of hydrocarbon contaminants compared to synthetic surfactants are reviewed.\u0000Keywords: Biosurfactants, Hydrocarbon degradation, Bioremediation, Environment.","PeriodicalId":248787,"journal":{"name":"July 2022 Edition","volume":"167 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128830423","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0