International Journal of Engineering Research in Africa最新文献_第9页

Reliability Analysis and Comparative Study of Ordinary Concrete and High Performance Concrete Filled with Steel Tube under Axial Compression 普通混凝土与高性能钢管混凝土轴压可靠度分析及对比研究

IF 0.7

International Journal of Engineering Research in Africa Pub Date : 2022-07-25 DOI: 10.4028/p-9h1zq6

Messaoudene Lydia, Nassim Kernou

引用次数: 0

Influence of Rice Husk Ash Fines on Geotechnical Properties of Lime Stabilized Lateritic Soil 稻壳粉对石灰稳定红土土岩土性能的影响

IF 0.7

International Journal of Engineering Research in Africa Pub Date : 2022-07-25 DOI: 10.4028/p-35mk32

F. Ayodele, B. Alo, A. Adetoro

{"title":"Influence of Rice Husk Ash Fines on Geotechnical Properties of Lime Stabilized Lateritic Soil","authors":"F. Ayodele, B. Alo, A. Adetoro","doi":"10.4028/p-35mk32","DOIUrl":"https://doi.org/10.4028/p-35mk32","url":null,"abstract":"Different fines of rice husk ash (RHA) are typically used as a binder for soil stabilization. This study aims to assess the performance of RHA fines as a binder with lime in the improvement of plasticity and compaction characteristics of stabilized soil. Consistency limits, particle sieve analysis, and compaction tests were conducted on the natural lateritic soil, while consistency limits and compaction tests were conducted on the stabilized lateritic soil. The tests conformed to BS 1377 (1990). The chemical compositions of the RHA were assessed. Lateritic soil samples were mixed with lime in the proportions of 2, 4, 6, 8, and 10% by weight of dry soil. Plasticity Index (PI) was used as the determinant of optimum performance of lime-stabilized lateritic soil and this was obtained at 8% of lime addition. Thereafter, binder ratios (Lime: RHA) of 0:8, 2:6, 4:4, 6:2, and 8:0 were employed in the blending of the lateritic soil. The Plasticity Index (PI) of the stabilized soil were generally lowered to 7.82%, 21.36%, 18.97%, 19.71%, 15.03% when stabilized with BR2:675μm, BR4:475μm, BR6:275μm, BR2:6300μm and BR6:2300μm respectively. All binder ratios containing both lime and RHA size of 75 μm reduced the PI. Also, the effect of all binder ratios containing both lime and all RHA sizes showed increment in the Maximum Dry Density (MDD). Similarly, soil stabilized with BR2:6150μm, BR4:475μm, BR4:4150μm, BR4:4300μm, BR6:2150μm and BR6:2300μm offered a lowered OMC. 75μm RHA and BR4:475μm had the potential to improve Lime-RHA stabilized lateritic soil mixture especially for road application.","PeriodicalId":45925,"journal":{"name":"International Journal of Engineering Research in Africa","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2022-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44587660","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: 2

A Novel Train Roof-Top Wind Energy Conversion System 一种新型列车车顶风能转换系统

IF 0.7

International Journal of Engineering Research in Africa Pub Date : 2022-07-25 DOI: 10.4028/p-ha82nm

Asegid Kebede, G. Worku, Abreham Tibeb Maru

{"title":"A Novel Train Roof-Top Wind Energy Conversion System","authors":"Asegid Kebede, G. Worku, Abreham Tibeb Maru","doi":"10.4028/p-ha82nm","DOIUrl":"https://doi.org/10.4028/p-ha82nm","url":null,"abstract":"Cities all around the globe are ramping up efforts to transform their infrastructure in order to achieve a carbon-neutral and sustainable future, resulting in fast electrification of transportation networks. The need for power in this industry is rising, notably in light rail transit. Application of train rooftops wind energy conversion has the potential to power light rail transits with renewable energy. This research paper presents a way to generate electrical energy by utilizing strong wind pressure from light rail trains that channels the induced wind towards the turbine. The current invention's main aim is to establish a method and system for producing energy utilizing winds that can be conveniently available in the operation of trains. Here the wind energy is independent of the variations in the direction and speeds in which seasonal winds move, which do not have the appropriate wind force or force at all times or places for operating the wind turbines. Vertical axis wind turbines are selected due to their advantage for the application under consideration. SOLIDWORKS and MATLAB simulation software were used for the design of the Train Roof-Tops Wind Energy Conversion System (TRT-WECS). The former was used to perform computational fluid dynamics (CFD) on the both normal train as well as the train having a turbine installed on the top, and a comparison has been made in terms of various parameters that affect the performance of the newly designed TRT-WECS. A mathematical model comprising mechanical and electric components has been developed by using MATLAB. Finally, the study found out that this special TRT-WECS design installed in each train provides an annual energy output of 4.9 MWh.","PeriodicalId":45925,"journal":{"name":"International Journal of Engineering Research in Africa","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2022-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42441523","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: 1

Parametric Study and Analysis of Modified Electromagnetic Band Gap in Frequency Notching of Ultra-Wide Band Antenna 超宽带天线频率陷波中修正电磁带隙的参数研究与分析

IF 0.7

International Journal of Engineering Research in Africa Pub Date : 2022-07-25 DOI: 10.4028/p-82d0o7

G. Fadehan, K. Adedeji, Y. Olasoji

{"title":"Parametric Study and Analysis of Modified Electromagnetic Band Gap in Frequency Notching of Ultra-Wide Band Antenna","authors":"G. Fadehan, K. Adedeji, Y. Olasoji","doi":"10.4028/p-82d0o7","DOIUrl":"https://doi.org/10.4028/p-82d0o7","url":null,"abstract":"This paper presents parametric study of dual band notch ultra wideband (UWB) antenna using modified electromagnetic band gap. The Electromagnetic Band Gap (EBG) comprises of two strip patched and an edge-located via with respect to ground for dual notch band. The study was presented in order to have an improved knowledge of EBG characteristics and its effect on the notching band of a small squared ultra wideband antenna of size 24 by 31 mm2 dual band notch using HFSS software. The antenna operates within the return loss (s11< -10dB) 3.2 to 12.3 GHz. The simulation results show that the notched band between 4.57 – 4.99 GHz and 7.96 – 8.32 GHz corresponding to WLAN and ITU respectively was achieved. The effect of gap distance between the field line and EBG was demonstrated as well and the position of via with respect to the ground as a means for notched band centre frequency tuning. The antenna could be considered a good candidate for any UWB applications that must avoid narrow band interference. The research gives ideas on the best placement position of EBG structure along field line in UWB antenna frequency notching technique.","PeriodicalId":45925,"journal":{"name":"International Journal of Engineering Research in Africa","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2022-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45889878","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: 3

Experimental Studies on Synthesis Gas Production from Wood Wastes in a Pilot Downdraft Gasifier 中试下吸式气化炉中木材废弃物合成气的试验研究

IF 0.7

International Journal of Engineering Research in Africa Pub Date : 2022-07-25 DOI: 10.4028/p-3t20w5

P. Akhator, A. Obanor, G. Sadjere

{"title":"Experimental Studies on Synthesis Gas Production from Wood Wastes in a Pilot Downdraft Gasifier","authors":"P. Akhator, A. Obanor, G. Sadjere","doi":"10.4028/p-3t20w5","DOIUrl":"https://doi.org/10.4028/p-3t20w5","url":null,"abstract":"Gasification is a green technology, which produces combustible gas mixture from solid biomass by partial oxidation at elevated temperatures. Synthesis gas, the desired product of such technology, has more uses than the solid biomass. In this study, a locally developed pilot scale fixed-bed downdraft biomass gasifier was examined. Several gasification experiments using mixed wood wastes (generated from the utilisation of various wood species for making furniture) as feedstock was carried out under varied operating conditions to ascertain their effects on the syngas produced in the process. The effects of grate temperatures and biomass moisture levels on rate of biomass consumption and produced syngas quality were examined via several gasification experiments. The performance of the biomass gasifier system was evaluated in terms of syngas composition, lower heating value, syngas yield and carbon conversion efficiency. The results obtained revealed an average syngas yield of 1.77Nm3 per kg of wood waste consumed. The averaged molar syngas composition obtained was 28.15% CO, 16.64% H2, 6.19% CO2, 2.54% CH4 and 45.42% N2, while the average syngas LHV was 6.23MJ/Nm3. These results were compared with those published in literature.","PeriodicalId":45925,"journal":{"name":"International Journal of Engineering Research in Africa","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2022-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44846166","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

Numerical Analysis of Natural Convection in a Concentric Trapezoidal Enclosure Filled with a Porous Medium 填充多孔介质的同心梯形外壳内自然对流的数值分析

IF 0.7

International Journal of Engineering Research in Africa Pub Date : 2022-07-25 DOI: 10.4028/p-jza9vq

O. Olayemi, M. Isiaka, K. Al‐Farhany, M. A. Alomari, M. Ismael, S. Oyedepo

{"title":"Numerical Analysis of Natural Convection in a Concentric Trapezoidal Enclosure Filled with a Porous Medium","authors":"O. Olayemi, M. Isiaka, K. Al‐Farhany, M. A. Alomari, M. Ismael, S. Oyedepo","doi":"10.4028/p-jza9vq","DOIUrl":"https://doi.org/10.4028/p-jza9vq","url":null,"abstract":"Numerical study of natural convection around a heated trapezoidal block of different sizes located centrically in a larger trapezium has been investigated. The annulus between the trapeziums is filled with porous media. The sides of the inner trapezium are heated to a fixed temperature (T_h), and the slanted walls of the outer trapezium are adiabatic while its upper and lower walls are heated to temperatures of 〖T_c+(T_h-T_c)sin〗⁡(πx⁄L) and 〖T_h+(T_h-T_c)sin〗⁡(πx⁄L) respectively. The finite element numerical approach was used to solve the relevant dimensionless equations. Results are gotten for salient parameters including; modified Rayleigh number (10≤Ra_m≤ 1000), Darcy number (10^(-5)≤Da≤ 10^(-2)), and area ratio (1/5≤AR≤ 1/3). The results of this study are shown as isothermal contours, stream functions, and average Nusselt number. The results show that increasing Ra_m improves heat transfer; however, the response of thermal characteristics to AR increment depends on the range of Darcy number considered. Results from this study find application in ingot treatments and microchannel cooling among others.","PeriodicalId":45925,"journal":{"name":"International Journal of Engineering Research in Africa","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2022-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48859996","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: 1

Comparative Study of a Pumping System Using Conventional and Photovoltaic Power in the Algerian Sahara (Application to Pastoral Wells) 阿尔及利亚撒哈拉地区常规与光伏抽水系统的比较研究(在田园井中的应用)

IF 0.7

International Journal of Engineering Research in Africa Pub Date : 2022-05-20 DOI: 10.4028/p-6sxg2q

R. Zegait, Mohamed Rafik Bentraia, H. Bensaha, Mohamed Azlaoui

{"title":"Comparative Study of a Pumping System Using Conventional and Photovoltaic Power in the Algerian Sahara (Application to Pastoral Wells)","authors":"R. Zegait, Mohamed Rafik Bentraia, H. Bensaha, Mohamed Azlaoui","doi":"10.4028/p-6sxg2q","DOIUrl":"https://doi.org/10.4028/p-6sxg2q","url":null,"abstract":"Many populations of isolated and rural areas around the world are facing major problems of water deficit in domestic needs, irrigation and grazing and remains the daily concern of the inhabitants and which are particularly accentuated in the arid and desert areas. In this context, several researchers have recently oriented their research to the solar system. This energy is clean and nonpolluting and its use provides an inexhaustible source of energy. Photovoltaic pumping is one of the applications of solar energy in remote sites where conventional electricity is absent, such as the Algerian Sahara, which has one of the highest solar deposits in the world which can exceed yearly 2263 kWh/m2. This solution represents the ideal technical method for supplying water from wells of groundwater. The main purpose of this work is to evaluate the reliability of solar pumping systems compared to a conventional power system applied to two experimental wells installed in an isolated pastoral region in the Algerian Sahara and precisely in the Ouargla region.The results showed that the generator pumping technique appears to be the least expensive at the beginning of the operation. The balance becomes clearly in favor of the solar pumping solution after a few years of operation (about 5 years), with a 50% benefit in the cost per cubic meter of water.","PeriodicalId":45925,"journal":{"name":"International Journal of Engineering Research in Africa","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2022-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41749536","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: 1

Analysis and Evaluation of a Three-Stage Anaerobic Digestion Plant for Management of Biodegradable Municipal Solid Waste 三段式厌氧消化装置处理可降解城市生活垃圾的分析与评价

IF 0.7

International Journal of Engineering Research in Africa Pub Date : 2022-05-20 DOI: 10.4028/p-a24obb

E. K. Orhorhoro, Emmanuel E. Lindsay, J. O. Oyejide

{"title":"Analysis and Evaluation of a Three-Stage Anaerobic Digestion Plant for Management of Biodegradable Municipal Solid Waste","authors":"E. K. Orhorhoro, Emmanuel E. Lindsay, J. O. Oyejide","doi":"10.4028/p-a24obb","DOIUrl":"https://doi.org/10.4028/p-a24obb","url":null,"abstract":"Sub-Sahara Africa countries are faced with the problem of solid waste management and access to sustainable energy. There is a need to develop a technology that can help to manage the generated solid waste and the same time produce green energy that is sustainable. Hence, this research work that focused on the development of a novel three-stage anaerobic digestion (AD) plant for management of biodegradable portion of municipal solid waste. An experimental design and preliminary tests using co-digestion of municipal solid waste was conducted with the operation and process parameters utilized in this research work. Conceptual design was generated based on results of experimental design. The developed AD plant was evaluated for performance and the results obtained compared to an existing single stage fixed dome AD pilot plant using 100 kg of substrates with an organic loading rate of 3 kg/m3day for an operating time of 163 days. The cumulative biogas yield, and behaviour of the operation and process parameters utilized in this research work were evaluated. The results obtained reveal that unlike the single stage fixed dome AD pilot plant, the three-stage AD plant enables continuous production of biogas. Besides, optimum conditions of neutral pH range of 6.99 m to 7.01 m, slurry mesophilic temperature range of 37.05 °C to 37.15 °C, and organic loading rate of 3kg/m3d that favoured optimum biogas yield were established.","PeriodicalId":45925,"journal":{"name":"International Journal of Engineering Research in Africa","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2022-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45911035","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: 1

Equilibrium and Kinetic Analysis on Cadmium Ion Sequestration from Aqueous Environment by Impregnated Chicken Feather Alkaline Biosorbent 浸渍鸡毛碱性生物吸附剂吸附水中镉离子的平衡及动力学分析

IF 0.7

International Journal of Engineering Research in Africa Pub Date : 2022-05-20 DOI: 10.4028/p-734lko

A. A. Adeyi, Mellisa Chinazom Uzoukwu, L. Popoola, A. Yusuff, Esther Bernard, A. Pam, A. Ogunyemi, A. Hamisu

{"title":"Equilibrium and Kinetic Analysis on Cadmium Ion Sequestration from Aqueous Environment by Impregnated Chicken Feather Alkaline Biosorbent","authors":"A. A. Adeyi, Mellisa Chinazom Uzoukwu, L. Popoola, A. Yusuff, Esther Bernard, A. Pam, A. Ogunyemi, A. Hamisu","doi":"10.4028/p-734lko","DOIUrl":"https://doi.org/10.4028/p-734lko","url":null,"abstract":"The presence of cadmium ions in the environment is dangerous to a human being because of its chronic and acute health syndromes such as hypertension, testicular atrophy, and skeletal fetus malformation. To eliminate cadmium ions from the environment, cheap, non-toxic, and environmental-friendly biosorbents, an alkaline impregnated adsorbent, were prepared in this study. Alkaline impregnated chicken feather biosorbents (AICFB) were synthesized and characterized by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) analysis. The AICFB prepared was employed for the cadmium sequestration from simulated wastewater. AICFB quantity, cadmium ion concentration, and temperature are parameters with significant effects on the metal ion sequestration process. Models by Langmuir, Freundlich, and Redlich-Peterson were assigned to analyse the adsorption isotherms. Experimental data seem good with all tested models, and best with the Redlich-Peterson model. The maximum sorption capacity of AICFB toward cadmium ion was 122.07 mg/g as monolayer entrapment at pH 6.5, 0.1 g of AICFB, 120 minutes contact time, and 298 K. The linear pseudo-first-order and pseudo-second-order kinetic models were applied for the analysis of kinetic data. The pseudo-second-order model suitably describes the cadmium ion uptake by AICFB, indicating the chemisorption process. The prepared AICFB demonstrates efficient cadmium metal sequestration from aqueous environments.","PeriodicalId":45925,"journal":{"name":"International Journal of Engineering Research in Africa","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2022-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47824129","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: 2

Design and Development of a Measurement System Dedicated to Estimate the Junction Temperature of Insulated Gate Bipolar Transistor Modules 绝缘栅双极晶体管模块结温测量系统的设计与开发

IF 0.7

International Journal of Engineering Research in Africa Pub Date : 2022-05-20 DOI: 10.4028/p-z9wh2k

Badredine Lamuadni, Rachid El Bouayadi, A. Amine, D. Zejli

{"title":"Design and Development of a Measurement System Dedicated to Estimate the Junction Temperature of Insulated Gate Bipolar Transistor Modules","authors":"Badredine Lamuadni, Rachid El Bouayadi, A. Amine, D. Zejli","doi":"10.4028/p-z9wh2k","DOIUrl":"https://doi.org/10.4028/p-z9wh2k","url":null,"abstract":"The damage state estimation of an Insulated Gate Bipolar Transistor (IGBT) power module requires the measurement of the junction temperature (Tj) of the active region. However, the accurate measurement of the temperature Tj is not simple to achieve and several methods have been developed to improve the accuracy of Tj measurements. Some of the well-known methods include the use of thermo-sensitive electrical parameters (TSEP). Although the TSEP methods do not provide access to the thermal mapping of the IGBT surface, they have the advantage of not affecting the physical integrity of the module. This paper aims to present a reliable programmable measurement system dedicated to estimating with great accuracy the thermal performance of the IGBT power module on the microsecond scale using the TSEP method. The advantage of this system is to provide full control of the injection of the power current and allows quick measurements of the cooling curve just after the injection of the heating power in the chip. The junction temperature calculated from the TSEP was found to be equal to 97.5 °C, which was confirmed by using the thermal camera. The accuracy of the proposed technique was found to be less than 2%. A comparison with the thermal Resistor-Capacitor (RC) network model is also carried out in this work. Experimental results demonstrate that the designed system is high efficiency and can, therefore, be used by scientific researchers and industrial engineers for predictive maintenance to monitor the performance state of IGBT power modules, which will reduce the probability of its failure or degradation.","PeriodicalId":45925,"journal":{"name":"International Journal of Engineering Research in Africa","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2022-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42886673","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: 2