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INFLUENCE OF AL2O3 NANO ADDITIVES ON THE VISCOSITY AND THERMAL CONDUCTIVITY OF DOUBLE DISTILLED WATER 纳米al2o3添加剂对二次蒸馏水粘度和导热性的影响
Pub Date : 2023-04-29 DOI: 10.30572/2018/kje/140202
Samir Sami Abed, Mehdi Sediqhi, A. Diwan
The nano fluid consist of Al2O3 nanoparticles was dissolved by double distilled water (DDW) in three concentrations, 0.5% wt, 1%wt, and 1.5%wt of nanomaterials.  The effect of adding nano materials on the viscosity and thermal conductivity was calculated experimentally at room temperature. Some mathematical models were used to calculate the viscosity and the thermal conductivity and compare it with the experimental work. The results showed that viscosity and thermal conductivity increased with increasing concentration of Al2O3 nanoparticles, and there is a great convergence between the theoretical and measured viscosity and thermal conductivity. The SEM images showed that there is homogeneity in the distribution of the nano fluid at 1%wt., and some agglomerations were detected at a concentration 1.5%.  The EDS spectrum showed that the percentage of aluminum increased gradually with increasing the Al2O3 concentration. The X-Ray diffraction indicated slight increase in the intensity of diffraction with increasing the Al2O3 concentration.
用双蒸馏水(DDW)以0.5% wt、1%wt和1.5%wt纳米材料的浓度溶解Al2O3纳米流体。在室温下,实验计算了纳米材料的加入对黏度和导热系数的影响。用数学模型计算了黏度和导热系数,并与实验结果进行了比较。结果表明:随着Al2O3纳米颗粒浓度的增加,黏度和导热系数增大,理论黏度和导热系数与实测黏度和导热系数有较大的收敛性;扫描电镜显示,在1%wt时,纳米流体的分布具有均匀性。浓度为1.5%时,检测到部分结块。EDS谱分析表明,随着Al2O3浓度的增加,铝的含量逐渐增加。x射线衍射表明,随着Al2O3浓度的增加,衍射强度略有增加。
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引用次数: 0
MECHANICAL PROPERTIES CHARACTERIZATION OF AL- 7075 / PHOSPHOGYPSUM METAL MATRIX COMPOSITES al - 7075 /磷石膏金属基复合材料的力学性能表征
Pub Date : 2023-02-08 DOI: 10.30572/2018/kje/140105
Waleed T. Rashid
Recent years have seen a movement in research from monolithic to composite materials due to the worldwide need for low-cost, high-performance, and high-quality materials. Aluminum matrix composites are used extensively in structural applications and the aerospace and car industries, owing to their high strength-to-weight ratio, cheap cost, and excellent wear resistance. A simple and cost-effective process for producing composites is also critical for broadening their use. Using the inexpensive and commonly used stir-casting process, reinforcements including particle alumina, silicon carbide, graphite, fly ash, etc. may be readily integrated into the melt. In the present paper, the 7075 Aluminum alloy metal matrix composite, with varied Phosphogypsum (PG) contents (2, 5, and 10% wt.%) reinforced particles having 53-106 µm in size, have been created utilizing the stir casting process. The influence of Phosphogypsum particle content on the mechanical characteristics of Metal Matrix Composite has been investigated, and the results manifested that the material reinforcement significantly improved the BHN hardness, tensile strength, and wear. These enhancements were made possible by the regular distribution of Phosphogypsum and the refining of Al-7075 grains. The most significant improvement in BHN hardness (123), tensile strength (160 MPa), and wear (0.2032 gm) were recorded at 10% Phosphogypsum.
近年来,由于世界范围内对低成本,高性能和高质量材料的需求,研究从单片材料到复合材料的运动。铝基复合材料由于其高强度重量比、低成本和优异的耐磨性,在结构应用、航空航天和汽车工业中得到广泛应用。生产复合材料的简单和经济有效的工艺对于扩大其用途也至关重要。使用廉价和常用的搅拌铸造工艺,增强剂包括颗粒氧化铝、碳化硅、石墨、粉煤灰等,可以很容易地融入熔体中。在本论文中,利用搅拌铸造工艺制备了7075铝合金金属基复合材料,其磷石膏(PG)含量(2%、5%和10% wt.%)不同,增强颗粒大小为53-106 μ m。研究了磷石膏颗粒含量对金属基复合材料力学性能的影响,结果表明,磷石膏颗粒含量的增加显著提高了BHN的硬度、抗拉强度和耐磨性。磷石膏的均匀分布和Al-7075晶粒的细化使这些增强成为可能。10%磷石膏对BHN硬度(123)、抗拉强度(160 MPa)和磨损(0.2032 gm)的改善最为显著。
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引用次数: 0
EXPERIMENTAL ASSESSMENT OF THE MECHANICAL PROPERTIES OF STEEL-FIBER COMPOSITE BAR (SFCB) REINFORCEMENT 钢纤维复合棒(sfcb)增强材料力学性能的试验评价
Pub Date : 2023-02-08 DOI: 10.30572/2018/kje/140104
Sundus A. Shukur, Hayder H. Alkhudery Hayder H. Alkhudery
The Steel-fiber reinforced polymer (FRP) composite bar (SFCB) is a recently proposed bar, it has a steel inner and an exterior layer of FRP, and an adhesive resin to bond the two materials. The SFCB bar used in this paper was made by using a handmade technique; this technique includes a manufacturing procedure that was described in this paper. SFCBs were tested using the standard uniaxial tensile test (ASTM A370) to figure out their mechanical properties and stress-strain relationship and compare them with the normal steel bars. Moreover, the bonding test was conducted to comprehend the bonding performance of SFCB in the concrete and to compare it with the normal steel performance, the bonding test was conducted according to ACI 440.3R-12. The experimental results illustrated that the values of yielding and ultimate tensile strengths of SFCB were slightly less than that of the conventional steel with percentages of 4% for both, the modulus of elasticity values which were found theoretically in good agreement with the test results values, the behavior of SFCB stress-strain curve was slightly different than the conventional steel behavior, with a stable post-yield modulus. Also, the results showed that the SFCB/Steel (SFCB/Steel) ratio between the bond strength of SFCB and the bond strength of steel bar was approximately 0.86, which means that the SFCB had lesser bond strengths than the normal steel with a percentage of 14%, the results also showed that the SFCB had less slip than the steel bar with a percentage of 10%.
钢纤维增强聚合物(FRP)复合棒材(SFCB)是最近提出的一种棒材,它具有钢的内层和玻璃钢的外层,并用粘合树脂将两种材料粘合在一起。本文使用的SFCB棒材采用手工制作技术;该技术包括在本文中描述的制造过程。采用标准单轴拉伸试验(ASTM A370)对sfcb进行测试,了解其力学性能和应力应变关系,并与普通钢筋进行比较。为了了解SFCB在混凝土中的粘结性能,并将其与普通钢的性能进行对比,进行了粘结试验,粘结试验按照ACI 440.3R-12进行。试验结果表明:SFCB的屈服强度和极限抗拉强度均略低于常规钢材,两者的比值均为4%;弹性模量与试验结果在理论上符合较好;SFCB的应力-应变曲线行为与常规钢材略有不同,屈服后模量稳定。结果表明,SFCB/Steel (SFCB/Steel)的粘结强度与钢筋的粘结强度之比约为0.86,即当SFCB的粘结强度为14%时,SFCB的粘结强度小于普通钢材;当SFCB的粘结强度为10%时,SFCB的滑移量小于钢筋。
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引用次数: 0
WEAR PERFORMANCE ANALYSIS OF NYLON-6/BORON NITRIDE POLYMER COMPOSITES USING TAGUCHI-PARETO AND TAGUCHI-ABC METHODS 基于taguchi-pareto法和taguchi-abc法分析尼龙-6/氮化硼聚合物复合材料的磨损性能
Pub Date : 2023-02-08 DOI: 10.30572/2018/kje/140102
A. A. Adekoya, S. Oke, W. Adedeji
Despite the industrial popularity of nylon 6 composites, their wear performance portrays a substantial knowledge gap on parametric importance. Consequently, this study optimizes and prioritizes the wear performance parameters of nylon 6/boron nitride composites using the Taguchi-Pareto and Taguchi-ABC methods based on 80-20 Pareto rule and the ABC analysis, using signal-to-noise ratios. From the literature information, the principal parameters considered are the %wt of reinforcement, normal load, sliding speed, and sliding distance, respectively. The results showed that the optimal parametric setting using the Taguchi-Pareto method is 4wt % of boron nitride Nanocomposite, 15 N of normal load, 100 rpm of sliding speed and 500m of sliding distance. The limitation of this study is the difficulty in deducing the most significant delta values or ranks through the parameters. This work drive towards more practically focused wear performance studies by industrial practitioners, showing critical optimization and prioritization procedures in a single study.
尽管尼龙6复合材料的工业普及,他们的磨损性能描绘了参数重要性的实质性知识差距。因此,本研究基于80-20 Pareto规则和ABC分析,使用信噪比,使用Taguchi-Pareto和Taguchi-ABC方法对尼龙6/氮化硼复合材料的磨损性能参数进行优化和优先排序。从文献资料来看,考虑的主要参数分别是钢筋%wt、法向荷载、滑动速度和滑动距离。结果表明,采用Taguchi-Pareto方法的最佳参数设置为氮化硼纳米复合材料质量分数为4wt %,正常载荷为15 N,滑动速度为100 rpm,滑动距离为500m。本研究的局限性在于难以通过参数推导出最显著的δ值或秩。这项工作推动了工业从业者对更实际的磨损性能研究,在一项研究中展示了关键的优化和优先排序程序。
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引用次数: 0
PERFORMANCE INVESTIGATION OF WIND TURBINES BASED ON DOUBLY FED INDUCTION GENERATORS WITH BACK-TO-BACK CONVERTER 基于背靠背变流器双馈感应发电机的风力发电机组性能研究
Pub Date : 2023-02-08 DOI: 10.30572/2018/kje/140101
Abdullah Muwafaq Alyousuf, Fatih Korkmaz
In the last decades, wind turbines have been extensively studied due to  the increasing demand for renewable energy sources. Based on a very strong background of operational experience with wind turbine generators of varying sizes and the development of high-performance power electronics, these most recent wind turbine generators offer the requisite and enhanced performance for their safe integration into the power systems. In the past, wind turbine generators were simply connected to distribution networks; however, current projects and wind turbine generators sizes require a direct connection to the transmission system level through a project-specific substation. Due to these developments, an integrated strategy is needed to maximize the allocation of control responsibilities between substation control and wind turbine control. Dual-Fed Induction Generator (DFIG) systems can be used in many ways to make complex solutions. In this paper, the design and control of DFIG systems are presented to improve WT operating performance in different cases. Given the strong association between converter control strategies and working conditions, it is important to better understand to demonstrates the importance of developing an appropriate modelling approach. The key findings are discussed, and recommendations are provided for future research in this paper.
在过去的几十年里,由于对可再生能源的需求不断增加,风力涡轮机得到了广泛的研究。基于不同尺寸的风力涡轮机发电机的强大操作经验背景和高性能电力电子技术的发展,这些最新的风力涡轮机发电机为其安全集成到电力系统提供了必要的增强性能。过去,风力发电机只是简单地连接到配电网;然而,目前的项目和风力涡轮发电机的大小需要通过项目特定的变电站直接连接到传输系统级别。由于这些发展,需要一种综合策略来最大限度地分配变电站控制和风力涡轮机控制之间的控制责任。双馈感应发电机(DFIG)系统可以通过多种方式进行复杂的求解。在不同的情况下,本文提出了DFIG系统的设计和控制,以提高小波变换的运行性能。考虑到变流器控制策略和工作条件之间的强烈关联,更好地理解和展示开发适当建模方法的重要性是很重要的。本文对主要研究结果进行了讨论,并对今后的研究提出了建议。
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引用次数: 0
GFDM TRANSCEIVER BASED ON ANN CHANNEL ESTIMATION 基于Ann信道估计的GFDM收发器
Pub Date : 2023-02-08 DOI: 10.30572/2018/kje/140103
A. Ali, Saad S. Hreshee
Generalized frequency division multiplexing (GFDM) is one of the candidate waveforms beyond 5G for wireless communication. Channel estimation is challenging in wireless transmission because of inherent interference. It is based on a pilot signal that uses Least Square (LS) and Normalized Least Mean Square (NLMS) to perform the estimation. This paper used the Artificial Neural Network (ANN) as a channel estimation method, considered a novel estimation process for the GFDM transceiver. The channel estimation based on ANN depends on the data set generated from LS estimation, which considers the proposed method is optimized to LS based on the backpropagation neural network. The ANN algorithm considered a fitness function to estimate the channel. Levenberg-Marquardt backpropagation (LM), Bayesian Regularization backpropagation (BR), and Scaled Conjugate Gradient backpropagation (SCG) training methods training by using the Matlab toolbox used to perform the estimation. BR training method gives the best performance than LS and other training methods at 22 neurons in hidden layers, which at 20dB give BER = 0.0369 that enhanced over LS by 0.08.
广义频分复用(GFDM)是5G以后无线通信的候选波形之一。由于固有干扰,信道估计在无线传输中具有挑战性。它是基于一个导频信号,使用最小二乘(LS)和归一化最小均方(NLMS)进行估计。本文采用人工神经网络(ANN)作为信道估计方法,研究了一种新的GFDM收发器信道估计方法。基于人工神经网络的信道估计依赖于LS估计生成的数据集,其中认为所提出的方法是基于反向传播神经网络优化到LS的。该算法考虑了适应度函数来估计信道。Levenberg-Marquardt反向传播(LM)、贝叶斯正则化反向传播(BR)和缩放共轭梯度反向传播(SCG)训练方法通过使用Matlab工具箱进行训练来执行估计。在隐藏层22个神经元时,BR训练方法比LS和其他训练方法表现最好,在20dB时BER = 0.0369,比LS训练方法提高0.08。
{"title":"GFDM TRANSCEIVER BASED ON ANN CHANNEL ESTIMATION","authors":"A. Ali, Saad S. Hreshee","doi":"10.30572/2018/kje/140103","DOIUrl":"https://doi.org/10.30572/2018/kje/140103","url":null,"abstract":"Generalized frequency division multiplexing (GFDM) is one of the candidate waveforms beyond 5G for wireless communication. Channel estimation is challenging in wireless transmission because of inherent interference. It is based on a pilot signal that uses Least Square (LS) and Normalized Least Mean Square (NLMS) to perform the estimation. This paper used the Artificial Neural Network (ANN) as a channel estimation method, considered a novel estimation process for the GFDM transceiver. The channel estimation based on ANN depends on the data set generated from LS estimation, which considers the proposed method is optimized to LS based on the backpropagation neural network. The ANN algorithm considered a fitness function to estimate the channel. Levenberg-Marquardt backpropagation (LM), Bayesian Regularization backpropagation (BR), and Scaled Conjugate Gradient backpropagation (SCG) training methods training by using the Matlab toolbox used to perform the estimation. BR training method gives the best performance than LS and other training methods at 22 neurons in hidden layers, which at 20dB give BER = 0.0369 that enhanced over LS by 0.08.","PeriodicalId":123515,"journal":{"name":"Kufa Journal of Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130761728","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
APPLICATION OF CONCRETE ENCASED ECOBRICK BLOCKS IN THE UK’S CONSTRUCTION INDUSTRY 混凝土包覆生态砖砌块在英国建筑业中的应用
Pub Date : 2022-10-14 DOI: 10.30572/2018/kje/130406
Daniel Durrans, Denise L. Lee, M. Sadique
The construction industry within the UK is at the forefront of new and alternative materials, which aid in efficient, sustainable and environmental-friendly construction projects. The concept of filling a single use plastic bottle with plastic waste and encasing it within a concrete surround, producing a composite block meets all three objectives. Due to the lack of ecobrick research within the UK, it became the catalyst for researching the concrete encased ecobrick block. At 7 day compressive testing the composite blocks were all weaker than the control samples and at 28 days the results were mixed. In comparison to a global study (Oman) the composite blocks were all greater in compressive strength. In conclusion, the composite blocks were found to be adequate for non-load bearing structural elements within the UK’s construction industry.
英国的建筑行业在新材料和替代材料方面处于领先地位,这有助于高效、可持续和环保的建筑项目。用塑料废物填充一次性塑料瓶并将其包裹在混凝土周围的概念,产生一个复合块,满足所有三个目标。由于在英国缺乏环保砖的研究,它成为研究混凝土包裹环保砖砌块的催化剂。在第7天的压缩测试中,复合块都比对照样品弱,在第28天的结果是混合的。与一项全球研究(阿曼)相比,复合块体的抗压强度都更高。总之,复合块被发现是足够的非承重结构元件在英国的建筑行业。
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引用次数: 0
A COMPARATIVE EVALUATION OF DEEP LEARNING METHODS IN DIGITAL IMAGE CLASSIFICATION 数字图像分类中深度学习方法的比较评价
Pub Date : 2022-10-14 DOI: 10.30572/2018/kje/130405
Hersh A. Mohammed, S. Kareem, A. Mohammed
White Blood Cells are important in determining a person's overall health. The blood disease diagnosis includes characterization and identification of blood samples of a patient. Neural Networks (NN), Convolutional Neural Networks (CNN), and a mix of CNN and NN models are used in recent techniques to improve visual content understanding. From start to finish, The authors were driven to uncover remarkable characteristics in example photographs because of their expertise in medical image analysis. For blood cell classification, the overall performance of individual cell patches extracted using blood smear techniques has been excellent. These approaches, on the other hand, are incapable of dealing with the issue of multiple cells overlapping. Because of the blood cell overlapping pictures, the input image dimension is compressed, the classification time is reduced, as well as the network works better with more accurate parameter estimates. In this review, we are evaluating a detailed scientific comparison of some of the ways used to improve WBC classification. The authors will show some of the ways used to automatically classify their cells. The results of some of the tests used using available data, compared to blood cell classification techniques.
白细胞在决定一个人的整体健康状况方面很重要。血液病诊断包括患者血液样本的特征和鉴定。神经网络(NN),卷积神经网络(CNN),以及CNN和NN模型的混合在最近的技术中用于提高视觉内容的理解。从开始到结束,由于他们在医学图像分析方面的专业知识,作者被驱使去揭示示例照片中的显着特征。对于血细胞分类,使用血液涂片技术提取的单个细胞斑块的总体性能非常出色。另一方面,这些方法无法处理多个细胞重叠的问题。由于血细胞图像的重叠,压缩了输入图像的维数,减少了分类时间,并且网络的性能更好,参数估计更准确。在这篇综述中,我们对一些用于改善白细胞分类的方法进行了详细的科学比较。作者将展示一些用于自动分类细胞的方法。与血细胞分类技术相比,一些使用现有数据的测试结果。
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引用次数: 0
Application Based performance monitoring heavy data transmission of Local Area Network 基于应用的局域网大数据传输性能监控
Pub Date : 2022-07-31 DOI: 10.30572/2018/kje/130302
Ammar O. Hasan
There are many applications should be work online, these applications can be seen in the application layer of OSI reference model, each one of these consumes particular band width, bit rate and network speed depending of the resources that used to make any application operate for example there is a widely difference between video streaming network application and text chatting application. In this paper when any computer network needs to be examined, at least two different applications should be taken for example to monitor network performance when these application going to work and get in action. In this paper the researcher designed and a local area network to implement dedicated applications, monitor the network factors performance, get results, and compare between applications.
有许多应用程序应该在线工作,这些应用程序可以在OSI参考模型的应用层中看到,这些应用程序中的每一个都消耗特定的带宽,比特率和网络速度,这取决于用于使任何应用程序运行的资源,例如视频流网络应用程序和文本聊天应用程序之间存在很大差异。在本文中,当需要检查任何计算机网络时,至少应该以两个不同的应用程序为例,在这些应用程序开始工作和运行时监视网络性能。在本文中,研究者设计了一个局域网来实现专用的应用程序,监控网络因素的性能,获得结果,并在应用程序之间进行比较。
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引用次数: 0
A SIMULATION OF SOLAR ENERGY SYSTEM CONTROLLED BY P&O, IC AND FUZZY LOGIC USING BIDIRECTIONAL CHARGING OF BATTERY 采用p&o、IC和模糊逻辑控制的电池双向充电太阳能系统仿真
Pub Date : 2022-07-31 DOI: 10.30572/2018/kje/130303
A. Al-Jabari, Fatih Korkmaz, M. Teke
In this study, a simulation designs using a MATLAB is presenting to identify the characteristic of a solar energy panel as main feeding part, also, an alternative source represented by battery to compenstae the required missing energy on the load in case of low energy produced by a PV panel due to the effect of atmosphere condition on the solar energy in case of low radiation and temperature degree fall on it where a PV system as a whole works on feeding both of load and battery, but it may depend on the stored energy into the battery based on its capacity. In this purpose, different maximum power point techniques used in the PV system to extract the maximum energy. Perturb and Observe P& O, Incremental Conductance IC and Fuzzy Logic are the main common and modern techniques for tracking the maximum power
在这项研究中,使用MATLAB的仿真设计呈现确定太阳能面板的特点为主要部分,同时,另一个由电池compenstae所需失踪能源在负载情况下的低能量产生的光伏面板由于大气条件对太阳能辐射和温度较低的程度上落在光伏系统作为一个整体工作的地方在喂养的负载和电池,但这可能取决于储存在电池中的能量,这取决于电池的容量。为此,在光伏系统中采用不同的最大功率点技术来提取最大能量。摄动和观察P& O、增量电导集成电路和模糊逻辑是跟踪最大功率的主要常用和现代技术
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引用次数: 0
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Kufa Journal of Engineering
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