FUOYE Journal of Engineering and Technology (FUOYEJET - Federal University Oye-Ekiti)
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A Review on the Detection of Offensive Content in Social Media Platforms
No full textOffensive content refers to messages which are socially unacceptable including vulgar or derogatory messages. As the use of social media increases worldwide, social media administrators are faced with the challenges of tackling the inclusion of offensive content, to ensure clean and non-abusive or offensive conversations on the platforms they provide. This work organizes and describes techniques used for the automated detection of offensive languages in social media content in recent times, providing a structured overview of previous approaches, including algorithms, methods and main features used. Selection was from peer-reviewed articles on Google scholar. Search terms include: Profane words, natural language processing, multilingual context, hybrid methods for detecting profane words and deep learning approach for detecting profane words. Exclusions were made based on some criteria. Initial search returned 203 of which only 40 studies met the inclusion criteria; 6 were on natural language processing, 6 studies were on Deep learning approaches, 5 reports analysed hybrid approaches, multi-level classification/multi-lingual classification appear in 13 reports while 10 reports were on other related methods.The limitations of previous efforts to tackle the challenges with regards to the detection of offensive contents are highlighted to aid future research in this area. Keywords— algorithm, offensive content, profane words, social media, text
Changes in Proximate Composition, Vitamin C and β-Carotene Contents of Oven Dried Pawpaw (Carica papaya) Fruit as Influenced by Pretreatment Methods
No full textA common way of maintaining essential nutrients in fruits and vegetables is through novel food processing techniques such as pretreatment. This study investigated the influence of pretreatment methods on the proximate composition, vitamin C and β-carotene contents of oven dried pawpaw. Fresh, ripe pawpaw fruit were peeled, sliced and pretreated with three pretreatments – ascorbic acid dip (0.45% w/v), honey dip (0.25% v/v) and steam blanching (100 °C). The fruit slices were soaked in ascorbic acid and honey solutions for 4 min while steam blanching was done for 2 min. Untreated pawpaw sample served as the control. The treated and control samples were dried at an average temperature of 65 °C. Results showed that vitamin C of dried pawpaw samples pretreated with honey dip had the highest retention of vitamin C (116.05 mg/100g) compared to ascorbic acid treated (98.90 mg/100g), steam blanched (109.02 mg/100g), and control samples (77.02 mg/100g). In terms of β-carotene, pawpaw sample treated with ascorbic acid solution had the highest value of 12.68 mg/100g. The use of honey and ascorbic acid solutions as treatments prior to drying can improve the retention of nutrients such as vitamin C and β-carotene in dried fruits.Keywords—Pretreatments, proximate properties, vitamin C, β-caroten
Effect of Tillage Direction on Phosphorus Loss from Sediment Yield and Surface Runoff
No full textThis paper assessed the impact of conservation and irrational ridge on phosphorus loss along the riverbank under rainy conditions. To understand the effects, experiments were conducted on farmland with slope gradients of 2%, 3% and 5%. Treatments included groundnut, cowpea, soybean, and no crop: contour and irrational ridge alternated in each runoff block. Standard method was used to calculate phosphorus loss. The results indicated that quantity of phosphorus loss in sandy loamy soils was 4.5 times higher than in loamy sand. In contrast, the phosphorus release (runoff) in loamy sand was 13.52 times higher than in sandy loam, so the average phosphorus loss in soil and surface runoff were 0.4 and 2 Kg / ha / year, respectively. Outcomes proved that the interaction between irrational ridge and vegetation cover increased the phosphorus concentration in the soils than water, thereby reducing aquatic organisms in rivers and creasing health risks for humans. The study recommends that contour cultivation be used very well to reduce phosphorus loss from sediment and runoff.Keywords— Contour and Irrational Tillage, Slope, Cover Crops, Analysis of covariance, Tillage Erosion, Rive
Rain Attenuation Prediction Models in Microwave and Millimeter Bands for Satellite Communication System: A Review
No full textThe progressively demand on satellite communication systems has consequently resulted in lower frequency bands getting more congested. The usage of frequency band beyond 10 GHz is in focus nowadays as a result of the rapid expansion of radio communication systems. However, Rain is the leading attenuation factor of different communication signal of frequencies beyond 10 GHz. Attenuation due to rain has a significant propagation effect that needs to be carefully considered in satellite communication system network. Rain attenuation predictions and rain rate are essential when planning microwave satellite communication links. A review of the rain rate integration time and rain attenuation models for microwave and millimeter bands satellite system is presented. Keywords: Frequency Band, Rain Attenuation, Rain Attenuation Model, Rain Rate, Satellite Syste
Performance of Some Biocoal Briquettes Produced from Mixture of Sawdust and varying Nigeria Coals as Composite Domestic Fuel
No full textPerformance evaluation of biocoal briquettes from three different coal mines in Nigeria mixed with sawdust as composite domestic fuel was carried out. Samples of coals collected from Owukpa, Okpara, and Onyeama mines were pulverized and blended with sawdust at various constituent ratios of coal/sawdust of 0.0/100, 10/90, 20/80, 30/70, 40/60, 50/50 and 100/0.0. Cassava starch was used as binding material while calcium hydroxide was used for desulphurization. Tests carried out included proximate analyses, ultimate analyses, and performance analyses. Results showed that fixed carbon in all the coal samples ranges from the highest fixed carbon of 63.81% for Okpara (OK) to the lowest of 62.87% for Owukpa (OP70/30) while sawdust was 21.03%. The Onyeama Coal has 1.25% ash content compares with 5% for Owukpa. Onyeama coal contains the highest volatile matters of 29.61% while Owukpa biocoal briquette (OP50/50) has the highest percentage heat utilization of 88.61 and lowest specific fuel consumption of 0.31kg/kg. Onyeama coal (ON90/10) has the highest calorific value of 33.25 MJ/kg. The addition of sawdust in the biocoal briquettes resulted in lower volatile matter, low hydrogen, high percentage heat utilized and low specific fuel consumption.Keywords- Biocoal briquette, sawdust, proximate analysis, ultimate analysis, fixed carbo
Fitting Rating Curves to Selected Streams in Southeast Nigeria
No full textLack of funds and political will have made continuous gauging of rivers in Nigeria impossible, thus stalling the development of surface water resources. In order to address this anomaly; this study is focused on developing discharge rating curve, for selected streams in Imo-Anambra river basin of southeast Nigeria, which is capable of predicting discharge from stage. Ten years monthly stage and discharge records, measured with stream gauges, for Rivers Adada in Enugu state, Ajali in Anambra state, Ivo in Ebonyi State, Otamiri in Imo state, and Imo (Umuopara) in Abia state, were used in estimating the rating curve models using simple linear regression as: , and . All the rating curve equations were validated using coefficient of determination which yielded values of 98.54%, 97.38%, 17.31%, 89.98% and 99.43%, but the empirical discharge-stage model of River Ivo was discarded as the model produced poor performance and lacked the features of a rating curve. The rating curve of Imo River predicted the highest discharge for equivalent input values of stage because of its large cross-section at the gauging station. The developed rating curve models are therefore recommended for discharge prediction in these catchment areas with limited streamflow records.Keywords— fitting, rating curve, southeast Nigeria, stream discharg
Analysis of Processing Hydrothermal Liquefaction of Microalgae Reaction Product with and without Dichloromethane Solvent for Biocrude Recovery
No full textProducing biocrude from hydrothermal liquefaction (HTL) of microalgae has the potential to complement fossil fuels, while simultaneously reducing greenhouse gas emissions. However, biocrude recovery from the HTL reaction product has been a concern. In this study, analysis of yields and property of biocrude recovered with and without using dichloromethane (DCM) organic solvent was investigated. The HTL experiment were performed at reaction temperature of 350oC and 20 min reaction time using 16 w/w % solids each of Spirulina sp. and Tetraselmis sp. Data obtained showed that use of DCM favours maximum biocrude yield but of lower quality when compared with DCM-free biocrude. Biocrude yield of 58wt% was obtained from Tetraselmis sp. and 48wt% from Spirulina sp. when DCM was used. About 38 and 40wt% biocrude yields were derived with DCM-free recovery process. Higher carbon content, energy dense, and lower heteroatoms content constitutes biocrude recovered without DCM treatment, which is in contrast to the biocrude recovered with DCM. In addition, an average energy input of 13MJ/kg is required to produce unit biocrude, with an additional energy input ~0.5MJ/kg to evaporate DCM when used in biocrude recovery.Keywords— Bio-energy, Hydrothermal liquefaction, Microalgae, Organic solvent, Separation metho
Experimental and Statistical Study on Black Cotton Soil Modified with Cement–Iron Ore Tailings
No full textThe investigation focused on the response of black cotton soil (BCS) treated with mixtures of iron ore tailings (IOT) and cement to varying compaction effort (CE). Preliminary tests showed that the un-treated soil is A-7-6 (22) on the basis of AASHTO protocols of classification while the USCS (Unified Soil Classification System) guidelines placed the soil in CH group. Laboratory tests carried out included cation exchange capacity, CEC, Specific gravity (Gs) and compaction test. Three compaction energy levels (i.e., British Standard heavy (BSH), West African Standard (WAS) and British Standard light (BSL)) were adopted for the compaction test. Test results showed that CEC decreased; Gs and MDD increased while OMC also decreased for all cement contents considered when admixed with the different IOT contents up to 10 % IOT by the soil dry weight. MDD values of 1.58, 1.59, 1.62, 1.64, 1.64 and 1.66 Mg/m3 were noted for 1% cement and 0, 2, 4, 6, 8 and 10% IOT content compacted with BSL energy. Also, OMC values of 21.2, 20.8, 20.5, 20, 20.3 and 20.2% were noted for 1% cement and 0, 2, 4, 6, 8 and 10% IOT content compacted with BSL energy. Same trend was noted for higher cement concentrations and compactive efforts. Regression models for MDD and OMC, considered as dependent variables while C (cement content), CE, IOT, Gs and PF (percentage of fine) as independent variables were developed using software (Mini-tab R15). The result of regression analysis shows that the independent variables considered greatly influence the dependent variables. ANOVA (Analysis of variance) was use to establish the levels of contributions of cement and IOT to the improvements recorded. Therefore, black cotton soil optimally treated with 4% cement 10% IOT blend and compacted with BSH energy is recommended for soil remediation or geotechnical engineering applications. Keywords— Compaction effort, iron ore tailings, black cotton soil (BCS), Analysis of Variance, regression analysis
Investigating Possibilities of fuelling NIRR-1 with Low Enriched Uranium Silicide-Aluminum Dispersion Fuels
No full textIn the last quarter of 2018, low enriched uranium dioxide fuel with zirconium alloy cladding was used successfully to convert the core of NIRR-1 from HEU to LEU fuel and the removed core returned to the country of origin. The objective of this study was to investigate the possibility of fueling the same system with alternate LEU fuel for future replacement of the current fuel, without any unacceptable compromise in reactor performance. Having more than one fuel options available for the same reactor system will present Nigeria an opportunity of making good economic decisions at the end of the cycle of the current LEU fuel. The performance of low enriched uranium silicide aluminum dispersion fuels in the core of NIRR-1 has been investigated and the results were identical with that of similar studies conducted elsewhere for generic MNSR system. Some of the calculated reactor parameters using this alternate LEU fuel were closely identical with that of the old HEU core. The computer software selected for this studies were the SCALE code system and the VENTURE PC. While the SCALE code system was employed to generate a properly averaged multigroup cross section library for the investigated LEU core models for NIRR-1 system, the VENTURE PC was utilized to give criticality information, few group fluxes and power density distributions within the core of the modeled system.Keywords— Reactor, Reactivity, Fuel, Enriched, Silicid
Influence of Particle Size and Particle Range Distribution on the Microstructure of Al–Mg–Si/PKSA Composite for Amateur Solid Rocket Chamber
No full textThe study discusses an overview of small rocket program, development and characterization of locally sourced material at low cost. The aim is to enable the construction of small sounding rocket components for experimental purposes in Nigeria. This paper proposes the utilization of palm kernel shell ash as filler materials in the development, characterization and production of composite material to construct prototype reusable chamber and accessories that will enable it possible for small scientific experiments. To achieve this, particle size and particle range distribution on the microstructure, texture, and mechanical properties of (Al–Mg–Si)/PKSA composites developed by powder metallurgy method were investigated. The access in the 6xxx series of aluminum-magnesium-silicon alloy was investigated for this reason. ImageJ software was used to do particle size analysis professionally and the software was used to calculate the area, mean, standard deviation (SD) and the pixel values. The particle size distribution of big constituent (densification or rather densified solids) particles and small dispersoids possess a finer and slightly elongated grain structure when compared with the unreinforced alloy. The results of the XRD and XRF of all the samples considered showed that Al2O3, SiO2, Mn2O3 and MgO phases were common to all. These hard phases are considered to be responsible for improved mechanical properties and resistance of the composite, while the SEM result showed that the reinforcement was uniformly distributed which further improves the mechanical property of the composite.Keywords: Microstructure, Composite, Rocket, Palm Kerne