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Mathematics for the Imaginary Number i 虚数的数学1
European Journal of Engineering Research and Science Pub Date : 2020-09-30 DOI: 10.24018/ejers.2020.5.9.2099
A. Lopez
{"title":"Mathematics for the Imaginary Number i","authors":"A. Lopez","doi":"10.24018/ejers.2020.5.9.2099","DOIUrl":"https://doi.org/10.24018/ejers.2020.5.9.2099","url":null,"abstract":"The only objective of this work is to: determine a function that of origin to the value of √-1 and, define the segment represent this magnitude of √-1. For this it is necessary the rule and compass.","PeriodicalId":12029,"journal":{"name":"European Journal of Engineering Research and Science","volume":"79 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73849488","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
Effect of Sulfur Levels and Number of Cuttings on Characteristics and the Yield of Barley (Hordeum vulgaire L) 含硫量和插条数对大麦特性及产量的影响
European Journal of Engineering Research and Science Pub Date : 2020-09-29 DOI: 10.24018/EJERS.2020.5.9.2118
Ahmed Ali Al-Karkhi
{"title":"Effect of Sulfur Levels and Number of Cuttings on Characteristics and the Yield of Barley (Hordeum vulgaire L)","authors":"Ahmed Ali Al-Karkhi","doi":"10.24018/EJERS.2020.5.9.2118","DOIUrl":"https://doi.org/10.24018/EJERS.2020.5.9.2118","url":null,"abstract":"Objective: Barley Hordeum vulgaire L is an important grain crop, and is grown in large areas all over the world. The experiment aims to study the effect of different levels of fertilizer from agricultural sulfur (0, 1500, 3000, and 4500 kg) S / H, and the number of cuttings (without cut, one cut, and cut twice) on the yield and quality of green forage and grain yield for barley crop Iba 99. \u0000Material and Methods: In this experiment, randomized whole section design was used in the arrangement of splinter panels - splinter with three replicates, sulfur levels for the secondary plates and the number of cuttings in the sub-plot plates. \u0000Results: The addition of agricultural sulfur at the level (4500 kg S / H) resulted in a significant increase in the following characteristics: - plant height, number of tillers / m2, number of spikes / m2 and grain yield. Whereas the sulfur level (3000 kg S / E) resulted in a significant increase in the two green forage yields and the number of grains / spike when added and for the first and second seasons in succession. \u0000Conclusion: Sulfur has significant effect on plant height and a significant effect of interference between sulfur levels and the number of leaves and number of tillers /m2, but it has no effect on the percentage of protein matter in green forage. The increase on sulfur has a significant effect on spike and gave the highest rate (509.4 spike / m2), and increase the protein level in grain to the highest rate 16.95.","PeriodicalId":12029,"journal":{"name":"European Journal of Engineering Research and Science","volume":"20 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85181346","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
Rain–Induced Flood Prediction for Niger Delta Sub-Region of Nigeria Using Neural Networks 基于神经网络的尼日利亚尼日尔三角洲地区雨致洪水预报
European Journal of Engineering Research and Science Pub Date : 2020-09-29 DOI: 10.24018/EJERS.2020.5.9.2114
L. Kabari, Young Claudius Mazi
{"title":"Rain–Induced Flood Prediction for Niger Delta Sub-Region of Nigeria Using Neural Networks","authors":"L. Kabari, Young Claudius Mazi","doi":"10.24018/EJERS.2020.5.9.2114","DOIUrl":"https://doi.org/10.24018/EJERS.2020.5.9.2114","url":null,"abstract":"Climate change generates so many direct and indirect effects on the environment.  Some of those effects have serious consequences. Rain-induced flooding is one of the direct effects of climate change and its impact on the environment is usually devastating and worrisome. Floods are one of the most commonly occurring disasters and have caused significant damage to life, including agriculture and economy. They are usually caused in areas where there is excessive downpour and poor drainage systems. The study uses Feedforward Multilayer Neural Network to perform short-term prediction of the amount of rainfall flood for the Niger Delta   sub region of Nigeria given previous rainfall data for a specified period of time. The data for training and testing of the Neural Network was sourced from Weather Underground official web site https://www.wunderground.com.  An iterative Methodology was used and implemented in MATLAB. We adopted multi-layer Feedforward Neural Networks. The study accurately predicts the rain-induced flood for the Niger Delta   sub region of Nigeria.","PeriodicalId":12029,"journal":{"name":"European Journal of Engineering Research and Science","volume":"252 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75822270","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
Design and Simulation of Air Conditioning System in a Large Auditorium Based on Computational Fluid Dynamics 基于计算流体力学的大礼堂空调系统设计与仿真
European Journal of Engineering Research and Science Pub Date : 2020-09-29 DOI: 10.24018/EJERS.2020.5.9.2062
R. Abu, K. Oladejo, A. O. Popoola, K. T. Oriolowo, K. M. Odunfa
{"title":"Design and Simulation of Air Conditioning System in a Large Auditorium Based on Computational Fluid Dynamics","authors":"R. Abu, K. Oladejo, A. O. Popoola, K. T. Oriolowo, K. M. Odunfa","doi":"10.24018/EJERS.2020.5.9.2062","DOIUrl":"https://doi.org/10.24018/EJERS.2020.5.9.2062","url":null,"abstract":"Air conditioning system is an indispensable part of buildings today. The cost of this system increases with the rise in energy consumption which poses a challenge as well as air distribution in large auditoria. Analysis of results can also be daunting when designing this system. The study focuses on designing an air conditioning system in a large auditorium, applying Computational Fluid Dynamics (CFD) and visualizing the result in a Virtual Reality (VR) environment. The 3-dimensional model of the 520-capacity Technology Lecture Theatre, University of Ibadan, Nigeria was drawn with Autodesk Revit and modified into the geometry applicable for Displacement Ventilation (DV) and Mixed Ventilation (MV) for ease of numerical analysis with ANSYS Fluent. The building model and simulation results were then imported into Unity software for visualization in VR. The DV achieved better thermal comfort and air distribution in the computer simulation. At a supply temperature of 292.15 K, the DV system was able to keep the auditorium temperature at about 296.50 K, while the MV system at a supply temperature of 289.15 K was only able to maintain the temperature at 295.40 K. The temperature profile showed that the lower region where the students were seated was colder in DV compared to MV by at least 3 K. The results were also observed from a convenient position in VR. This study, with the aid of CFD and VR, was able to establish that displacement ventilation design has better air flow, lower energy consumption and is efficient for an air conditioning system in a large auditorium.","PeriodicalId":12029,"journal":{"name":"European Journal of Engineering Research and Science","volume":"40 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78116774","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
Influence of the Drop Volume and Applied Magnetic Field on the Wetting Features of Water-based Ferrofluids 液滴体积和外加磁场对水基铁磁流体润湿特性的影响
European Journal of Engineering Research and Science Pub Date : 2020-09-28 DOI: 10.24018/EJERS.2020.5.9.2158
B. Suciu
{"title":"Influence of the Drop Volume and Applied Magnetic Field on the Wetting Features of Water-based Ferrofluids","authors":"B. Suciu","doi":"10.24018/EJERS.2020.5.9.2158","DOIUrl":"https://doi.org/10.24018/EJERS.2020.5.9.2158","url":null,"abstract":"In this work, the influence of the drop volume and applied magnetic field on the wetting features of water-based ferrofluids, is experimentally investigated. Firstly, water drops with volume in the range of 0.1–100 micro-liters are placed, by using micro-pipettes, on bare and coated acrylic plates, to gain reference data concerning the contact angle. Then, drops of water-based ferrofluid, with the volume ranging from 1 to 10 micro-liters, are set on bare acrylic plates, which are placed into the uniform magnetic field created, in normal direction to the plate, by using permanent magnets. Since the ferrofluid drops are elongated along the magnetic field, the contact angle increases at augmentation of the magnetic flux. Besides, when a critical magnetic flux is exceeded, ferrofluid drop loose contact with the plate and jumps towards the magnet. A heuristic equation to predict the fluctuation of the liquid surface tension versus the drop volume, and also versus the ratio of the applied magnetic field energy to the kinetic energy of the magnetic particles dispersed into the water-based ferrofluid, is suggested.","PeriodicalId":12029,"journal":{"name":"European Journal of Engineering Research and Science","volume":"132 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75685255","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
Optimisation of Grease Dispensation for Heavy-duty Mining Excavators 重型矿用挖掘机润滑脂分配优化
European Journal of Engineering Research and Science Pub Date : 2020-09-27 DOI: 10.24018/EJERS.2020.5.9.2121
A. Simons, Richard Wireko, C. Addy
{"title":"Optimisation of Grease Dispensation for Heavy-duty Mining Excavators","authors":"A. Simons, Richard Wireko, C. Addy","doi":"10.24018/EJERS.2020.5.9.2121","DOIUrl":"https://doi.org/10.24018/EJERS.2020.5.9.2121","url":null,"abstract":"This work deals with improvement of the control of lubricant dispensation for automatic centralized lubrication system on heavy-duty mining excavators. The method adopted toachieve this includes analysis of mechanical, electrical and electronic components of the existing system. Subsequently, modifications were made on the system. Mechanical and electrical components were selected to control dispensation of lubricant whilst electronic components were selected to interact via communicating electrical signal to electrical components. Grease manifold block and current regulating solenoid valve were selected to work with a grease control module that communicates with a motion logic control module through a control area network connected to excavator joystick and pedal. Lubricant savings of 60.80 cm3/min (0.0608 litres/min) which amounts to annual savings of $ 62,102.09 per annum, can be made with the proposed modification in a typical mining excavator.","PeriodicalId":12029,"journal":{"name":"European Journal of Engineering Research and Science","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87382236","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
Diagnosis of Head and Neck Cancer in Developing Countries Using a Stacked Ensemble Model 使用堆叠集成模型诊断发展中国家头颈癌
European Journal of Engineering Research and Science Pub Date : 2020-09-15 DOI: 10.24018/EJERS.2020.5.9.2095
Folake Akinbohun, A. Akinbohun, A. Daniel, Oghenerukevwe Elohor Ojajuni
{"title":"Diagnosis of Head and Neck Cancer in Developing Countries Using a Stacked Ensemble Model","authors":"Folake Akinbohun, A. Akinbohun, A. Daniel, Oghenerukevwe Elohor Ojajuni","doi":"10.24018/EJERS.2020.5.9.2095","DOIUrl":"https://doi.org/10.24018/EJERS.2020.5.9.2095","url":null,"abstract":"Head and neck cancers (HNC) are indicated when cells grow abnormally.  The incidence of HNC is on the increase owing to several factors. There is often late presentation that can result in loss of lives (mortality) especially in Africa due to paucity of specialists. These challenges prompted the development of a stacked ensemble model for diagnosis of HNC to facilitate prompt referral.  The data were collected which consists of 1473 instances with 18 features.   Information Gain was used for selecting important features and three supervised learning algorithms were deployed for the base learners: Decision Tree (C4.5), K-Nearest Neighbors and Naïve Bayes. The predictions of the base learners were combined and passed to meta learners: Logistic Model Tree (LMT). The result showed that Information Gain method with stacked LMTwas 95.11%. It was deduced that both Information Gain with stacked MLR produced higher accuracy that the base learners’ results. Hence, this stacked model can be used for diagnosis of HNC in healthcare systems.","PeriodicalId":12029,"journal":{"name":"European Journal of Engineering Research and Science","volume":"125 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83231838","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
Wear Resistance Improvement of Copper Alloys Using a Thermochemically Obtained Zinc-Rich Coating 热化学制备富锌涂层提高铜合金耐磨性
European Journal of Engineering Research and Science Pub Date : 2020-09-14 DOI: 10.24018/EJERS.2020.5.9.2070
O. Alvarez, Carlos Valdés, A. Barba, R. Gonzalez, R. Valdez, C. Cruz, Dayi Gilberto Agredo, A. Covelo, Miguel Hernández
{"title":"Wear Resistance Improvement of Copper Alloys Using a Thermochemically Obtained Zinc-Rich Coating","authors":"O. Alvarez, Carlos Valdés, A. Barba, R. Gonzalez, R. Valdez, C. Cruz, Dayi Gilberto Agredo, A. Covelo, Miguel Hernández","doi":"10.24018/EJERS.2020.5.9.2070","DOIUrl":"https://doi.org/10.24018/EJERS.2020.5.9.2070","url":null,"abstract":"It has been developed a thermochemical process that has been applied on copper alloys: brass and bronze, using pure zinc powder, obtaining a zinc-rich wear protective coating. The layers obtained by a diffusion process, on brass (alloy C36000) and bronze specimens (alloy SAE 62), were characterized using a scanning electron microscope, EDAX microanalysis, Vickers microhardness, X-Ray diffraction analysis, and sliding wear test. The chemical analysis showed a layer composition of 62 % Zn and 38 % Cu, on average. The microhardness for thermochemical treated brass was 496HV and 598HV for bronze; thus, a microhardness increase for brass is 468% and 532% for bronze. It was made an X-Ray diffraction analysis, confirming the results obtained with the chemical analysis and crystalline structure for coating. It showed the presence of Cu64Zn36 and Cu5Zn8 phases. The wear tests demonstrated that treated specimens show better wear resistance than non-protected specimens.","PeriodicalId":12029,"journal":{"name":"European Journal of Engineering Research and Science","volume":"21 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74221572","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
A Fuzzy Inventory Model Considering Imperfect Quality Items with Receiving Reparative Batch and Order 考虑不完美产品接收修理批次和订单的模糊库存模型
European Journal of Engineering Research and Science Pub Date : 2020-09-12 DOI: 10.24018/ejers.2020.5.10.2184
Hesamoddin Tahami, H. Fakhravar
{"title":"A Fuzzy Inventory Model Considering Imperfect Quality Items with Receiving Reparative Batch and Order","authors":"Hesamoddin Tahami, H. Fakhravar","doi":"10.24018/ejers.2020.5.10.2184","DOIUrl":"https://doi.org/10.24018/ejers.2020.5.10.2184","url":null,"abstract":"This paper presents an inventory model for imperfect quality items with receiving a reparative batch and order overlapping in a fuzzy environment by employing fuzzy triangular numbers. It is assumed that the imperfect items identified by Screening are divided into either scrap or reworkable items. The reworkable items are kept in store until the next items are received. Afterward, the items are returned to the supplier to be reworked. Also, a discount on the purchasing cost is employed as an offer of cooperation from a supplier to a buyer to compensate for all additional holding costs incurred to the buyer. The rework process is error-free. An overlapping order scheme is employed so that the vendor is allowed to use the previous shipment to meet the demand by the inspection period. In the fuzzy model, the graded mean integration method is taken to defuzzify the model and determine its approximation of a profit function and optimal policy. In doing so, numerical examples are rendered to represent the model behavior, and, eventually, the sensitivity analysis is presented.","PeriodicalId":12029,"journal":{"name":"European Journal of Engineering Research and Science","volume":"69 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82344323","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: 16
Normality Testing for Vectors on Perceptron Layers 感知器层上向量的正态性检验
European Journal of Engineering Research and Science Pub Date : 2020-09-11 DOI: 10.24018/ejers.2020.5.9.2090
Y. Karaki, Halina Kaubasa, N. Ivanov
{"title":"Normality Testing for Vectors on Perceptron Layers","authors":"Y. Karaki, Halina Kaubasa, N. Ivanov","doi":"10.24018/ejers.2020.5.9.2090","DOIUrl":"https://doi.org/10.24018/ejers.2020.5.9.2090","url":null,"abstract":"Designing optimal topology of network graph is one of the most prevalent issues in neural network applications. Number of hidden layers, number of nodes in layers, activation functions, and other parameters of neural networks must suit the given data set and the prevailing problem. Massive learning datasets prompt a researcher to exploit probability methods in an attempt to find optimal structure of a neural network. Classic Bayesian estimation of network hyperparameters assumes distribution of specific random parameters to be Gaussian. Multivariate Normality Analysis methods are widespread in contemporary applied mathematics. In this article, the normality of probability distribution of vectors on perceptron layers was examined by the Multivariate Normality Test. Ten datasets from University of California, Irvine were selected for the computing experiment. The result of our hypothesis on Gaussian distribution is negative, ensuring that none of the set of vectors passed the criteria of normality.","PeriodicalId":12029,"journal":{"name":"European Journal of Engineering Research and Science","volume":"35 24","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72581806","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
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