Nigerian Journal of Technology最新文献_第9页

An innovative pedagogical simulation and animation of a shovel-truck system 一个创新的教学模拟和动画的铲卡车系统

Nigerian Journal of Technology Pub Date : 2023-05-08 DOI: 10.4314/njt.v42i1.15

G. Agyei, E.A. Kateng

引用次数: 0

Design of a gsm-based remotely operated electrical energy management system 基于gsm的远程电能管理系统的设计

Nigerian Journal of Technology Pub Date : 2023-05-08 DOI: 10.4314/njt.v42i1.20

E.B. Mfonobong, M.S. Owoh, U. Ekpe

引用次数: 0

Recovery of manganese and zinc from spent zinc-carbon dry cells via sulphuric acid leaching using glucose as reductant 葡萄糖作还原剂硫酸浸出锌碳干电池废锰锌的研究

Nigerian Journal of Technology Pub Date : 2023-05-08 DOI: 10.4314/njt.v42i1.17

O. Sanda, O.J. Ilesanmi, E. Taiwo

引用次数: 0

A trust, privacy and security model for e-commerce in Nigeria 尼日利亚电子商务的信任、隐私和安全模式

Nigerian Journal of Technology Pub Date : 2023-05-08 DOI: 10.4314/njt.v42i1.19

O. Akinola, O. Asaolu

引用次数: 0

The menace and mitigation of air pollution in the built environment: A review 建筑环境中空气污染的威胁与缓解:综述

Nigerian Journal of Technology Pub Date : 2023-05-08 DOI: 10.4314/njt.v42i1.3

C. Nnaji, C. Chibueze, C. Afangideh

{"title":"The menace and mitigation of air pollution in the built environment: A review","authors":"C. Nnaji, C. Chibueze, C. Afangideh","doi":"10.4314/njt.v42i1.3","DOIUrl":"https://doi.org/10.4314/njt.v42i1.3","url":null,"abstract":"Air pollution has become one of the leading causes of death globally. This paper investigates the causes as well as sources of air pollution in the indoor and outdoor environment. It identifies anthropogenic activities related such as transportation and other activities involving the combustion of fossil fuel as the major causes of air pollution. The several and diverse health implications of air pollution were highlighted. The dangerous nature of carbon monoxide was x-rayed and the common indoor and outdoor sources were discussed. The risks of carbon monoxide poisoning from generator fumes and vehicle exhaust were clearly enumerated. Particulate matter (PM10, PM2.5 and ultra fine PM) were clearly shown to be the major casue of chronic and fatal respiratory and cardiovascular diseases. Indoor air quality, which is usually overlooked was brought to the fore and shown to be worse than outdoor air quaility in some cases, especially where ventilation is poor. The inextricable link between air pollution and climate change was also established. Mitigative measure such as policies/acts, replacement of fossil fuel with solar PVs, replacement of conventional vehicles with electric vehicles and establishment of urban forests were discussed. Frequent and evenly distributed air quality monitoring, especially using android-enabled portable devices was broached. Besides, policies and other global approaches, individuals must adopt personal protective measures to protect themselves from the menace of air pollution. ","PeriodicalId":33360,"journal":{"name":"Nigerian Journal of Technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46659386","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

Determination of electric power generation potential of Abuja’s municipal solid wastes 阿布贾城市固体废物发电潜力的测定

Nigerian Journal of Technology Pub Date : 2023-05-08 DOI: 10.4314/njt.v42i1.14

P. A. Ondachi, I. Ozigis, M. T. Zarmai

{"title":"Determination of electric power generation potential of Abuja’s municipal solid wastes","authors":"P. A. Ondachi, I. Ozigis, M. T. Zarmai","doi":"10.4314/njt.v42i1.14","DOIUrl":"https://doi.org/10.4314/njt.v42i1.14","url":null,"abstract":"Electric Power Generation Potential of Municipal Solid Wastes (MSW) in Abuja, the capital city of Nigeria has been studied in this work. A pilot study on waste generation activities in Galadimawa District of Abuja was carried out and the results were applied to the metropolis as a whole due to the observed similarities in the demographics of Galadimawa and other Districts in the metropolis. The city of Abuja presently has an annual MSW generation rate of 973,557 tons with a per capita generation of 0.77 kg/day. Waste fractions for the metropolis were also analysed and discounting materials that have recycling value, energy bearing fractions of organic and textile wastes were found to be 59.5%. This translates to 579266.42 tons per annum and with an aggregate higher heating value (HHV) of 15.84 MJ/kg for this fraction, this approximates to about 9.2 x 109 MJ/annum of realisable energy. Using a typical waste-to-energy (WTE) plant efficiency of 44% it is seen that Abuja’s MSW can support a power generating plant with a capacity of 128 MW. This potential far exceeds the energy being presently delivered to Abuja city from the national grid which is about 80 MW.","PeriodicalId":33360,"journal":{"name":"Nigerian Journal of Technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42494583","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

Effects of homogenous-heterogeneous reactions on stagnation point of aligned MHD Casson nanofluid over a melting surface 均匀非均相反应对MHD-Casson纳米流体在熔融表面上驻点的影响

Nigerian Journal of Technology Pub Date : 2023-05-08 DOI: 10.4314/njt.v42i1.2

T. W. Akaje, B. Olajuwon, M. T. Raji

引用次数: 0

Effect of partial replacement of aggregate with granulated polyethylene terephthalate (pet) on compressive strength of concrete 聚对苯二甲酸乙二醇酯颗粒部分替代骨料对混凝土抗压强度的影响

Nigerian Journal of Technology Pub Date : 2023-05-08 DOI: 10.4314/njt.v42i1.5

O. Orie, O.J. Olusesi

{"title":"Effect of partial replacement of aggregate with granulated polyethylene terephthalate (pet) on compressive strength of concrete","authors":"O. Orie, O.J. Olusesi","doi":"10.4314/njt.v42i1.5","DOIUrl":"https://doi.org/10.4314/njt.v42i1.5","url":null,"abstract":"This paper is aimed at the development of appropriate combination of composite materials such as cement, aggregates and inclusion of Polyethylene Terephthalate (PET) in varying proportion in order to determine the optimal measure for the optimal strength. The study also, investigated the effect of PET aggregate on the compressive strength of concrete. Mix design targeting grade 25 concrete strength, using the Department of Environment (DOE) approach was adopted. Five different concrete samples were prepared accordingly, using natural aggregate as control mix and four others which consist of PET aggregate as partial replacement of fine aggregate at 5%, 10%, 15%, and 20% ratios respectively. The recycled fine aggregate (PET) was processed from bottle water waste, it was crushed, pressed and processed into finely material having river sand resemblance i.e., well distributed within sieve sizes of 0.075 and 2.00. The batching was done by weight. Cubes specimens were prepared, cured for 7, 14, and 28days and tested for compression. The results of the tests were analyzed statistically using regression method (Mintab) to establish optimal strength require mixture. The results and analysis established that there were reduction in compressive strength of the concrete containing PET aggregate and reduction rates increased with increase in the amount of PET inclusion in the concrete. The compressive strength values for 5%, 10%, 15% and 20% replacement of sand with PET at 28-day were 29.70N/mm2 , 25.95N/mm2 , 24.28N/mm2 and 23.23N/mm2 respectively. When compared with the control concrete specimens with an average value of 33.08N/mm2 gave 11.38%, 27.48%, 36.24% and 42.40% reduction in strength respectively. It was recommended that, though, the use of PET aggregate in the production of concrete does not have significant appreciable effect on the concrete strength, its use will protect the environment and as well help to conserve natural resources used as materials in production of concrete elements which currently undergo excessive depletion. ","PeriodicalId":33360,"journal":{"name":"Nigerian Journal of Technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43125927","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

The evaluation of engineering properties of some selected aggregates in south western Nigeria for concrete production 尼日利亚西南部用于混凝土生产的一些选定骨料的工程性能评估

Nigerian Journal of Technology Pub Date : 2023-05-08 DOI: 10.4314/njt.v42i1.11

S. S. Omopariola, A. Jimoh

{"title":"The evaluation of engineering properties of some selected aggregates in south western Nigeria for concrete production","authors":"S. S. Omopariola, A. Jimoh","doi":"10.4314/njt.v42i1.11","DOIUrl":"https://doi.org/10.4314/njt.v42i1.11","url":null,"abstract":"The study was carried out to assess the suitability of sand available in South Western Nigeria for concrete production. Collected samples of sand were tested in the laboratory to determine their physical properties. The properties considered are gradation, specific gravity, water absorption, moisture content, bulking, and percentage silt content. The result of the sieve analysis indicates that while the gradation of some of the samples is within the specified values specified in standards, others do not conform. The values of the coefficient of uniformity and coefficient of curvature is between the range of 3.6 – 10 and 0.53 – 2.56 respectively. The values of the results of specific gravity, water absorption, the moisture content are within the range of 2.67 – 2.86, 0.67% – 2.04%, 0.75% – 3.17% respectively. Based on the fact that the result of the test on the properties of the samples tested are in accordance with the specifications in relevant codes as discussed in the body of this work, it can be concluded that most of the samples are suitable for concrete production while the gradation of some of the samples needed to be modified to conform to the required grading. ","PeriodicalId":33360,"journal":{"name":"Nigerian Journal of Technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46412723","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

Determination of supply conditions, scenarios and pay-off for industrial machinery supplier selection post economic and engineering considerations 经济和工程考虑后工业机械供应商选择的供应条件、情景和回报的确定

Nigerian Journal of Technology Pub Date : 2023-03-14 DOI: 10.4314/njt.v41i6.7

A. S. Aninkan, B. Akinnuli, M. K. Adeyeri

{"title":"Determination of supply conditions, scenarios and pay-off for industrial machinery supplier selection post economic and engineering considerations","authors":"A. S. Aninkan, B. Akinnuli, M. K. Adeyeri","doi":"10.4314/njt.v41i6.7","DOIUrl":"https://doi.org/10.4314/njt.v41i6.7","url":null,"abstract":"Supply conditions after economics and engineering considerations is important for consideration because machinery and equipment procurement is a tripod of which supply conditions is one. This study identified the attributes of supply conditions, different ways of combining the attributes using simple permutation and combination theories and determined the pay-off as well as the opportunity lost to every scenario used by method of Expected Decision Value (EDV). The attributes were identified as: Due Date of the Supply (A); Technical Capability of Vendor (B); After Sales Services (C); and Vendor’s Experience (D). Total number of scenarios were 15 of four (4) options. The pay-off with the opportunity lost to each selected option are: Option1 (25% against 75%); Option2 (50% against 50%); Option3 (75% against 25%); and Option4, 100% where the four (4) strategic decisions were all considered for selecting the supplier turns out to be optimum and in favour of purchaser. Further research in the area of development of a Surrogate Model for Industrial Machinery Supplier Selection Post Economics and Engineering Considerations is recommended.","PeriodicalId":33360,"journal":{"name":"Nigerian Journal of Technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41984543","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