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Artificial Neural Network Modeling for Predicting Thermal Conductivity of EG/Water-Based CNC Nanofluid for Engine Cooling Using Different Activation Functions

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Frontiers in Heat and Mass Transfer 2024年第2期22卷 537-556页

作者： MdMunirul Hasan MdMustafizur Rahman Mohammad Saiful Islam Wong Hung Chan Yasser M.Alginahi Muhammad Nomani Kabir Suraya abu bakar Devarajan Ramasamy Faculty of Computing Universiti Malaysia Pahang Al-Sultan AbdullahPekanPahang26600Malaysia Faculty of Mechanical and Automotive Engineering Technology Universiti Malaysia Pahang Al-Sultan AbdullahPekanPahang26600Malaysia Department of Management and Information Technology St.Francis College179 Livingston StBrooklynNY11201USA Dell Technologies Data Analyticsand AutomationBukit TengahBukit Mertajam14000Malaysia Department of Computer Science Adrian CollegeAdrianMIUSA Department of Computer Science&Engineering United International University BangladeshUnited CityMadani AvenueBaddaDhaka1212Bangladesh

A vehicle engine cooling system is of utmost importance to ensure that the engine operates in a safe temperature *** most radiators that are used to cool an engine,water serves as a cooling *** performance of a radiator in terms of heat transmission is significantly influenced by the incorporation of nanoparticles into the cooling *** and uniformity of nanoparticle distribution are the two major factors for the practical use of *** shape and size of nanoparticles also have a great impact on the performance of heat *** researchers are investigating the impact of nanoparticles on heat *** study aims to develop an artificial neural network(ANN)model for predicting the thermal conductivity of an ethylene glycol(EG)/waterbased crystalline nanocellulose(CNC)nanofluid for cooling internal combustion *** implementation of an artificial neural network considering different activation functions in the hidden layer is made to find the bestmodel for the cooling of an engine using the *** of the model with different activation functions in artificial neural networks are analyzed for different nanofluid concentrations and *** artificial neural networks,Levenberg–Marquardt is an optimization approach used with activation functions,including Tansig and Logsig functions in the training *** findings of each training,testing,and validation phase are presented to demonstrate the network that provides the highest level of *** best result was obtained with Tansig,which has a correlation of 0.99903 and an error of 3.7959×10^(–8).It has also been noticed that the Logsig function can also be a good model due to its correlation of 0.99890 and an error of 4.9218×10^(–8).Thus ourANNwith Tansig and Logsig functions demonstrates a high correlation between the actual output and the predicted output.

关键词： Artificial neural network activation function thermal conductivity nanocellulose

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Void Growth and Interaction in a Structural Aluminum Alloy: Experiments and Theory

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Journal of Minerals and Materials Characterization and Engineering 2021年第1期9卷 14-37页

作者： Scott Gampert abu bakar Siddique Tariq A. Khraishi Mechanical Engineering Department University of New Mexico Albuquerque USA

The problem of void growth and interaction is of importance to understanding the mechanics of failure in metals exhibiting ductility. In this work, the growth and interaction of voids in 6061-T6 aluminum were studied experimentally. Specifically, holes of varying numbers and relative placement were investigated for their normalized area growth with applied displacement. Flat dog-bone specimens were carefully drilled in their gauge area with no (zero) holes, one hole, and two holes (arranged vertically or horizontally) for experimentation after polishing. The growth of holes, captured by video recordings, exhibited exponential behavior and was influenced greatly by the number and arrangement of holes with the horizontal voids growing the fastest and the vertical ones growing the slowest. Also, the ensuring deformation of the sample was studied using load-displacement curves, pictography and videography, SEM imaging and Atomic Force Microscopy (AFM). The methods revealed that although the major part failure is due to large crack formation, it was preceded by intense dislocation slip activity and the formation of micro cavities. Also, the AFM quantified the three-dimensional nature of crystal or grain deformation and how it is greatly influenced by distance and location from the hole. Lastly, theoretical understanding of hole growth was offered.

关键词： Voids Holes Stress Concentration Void Growth Void Interaction

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The Strain/Stress Fields of a Subsurface Rectangular Dislocation Loop Parallel to the Surface of a Half Medium: Analytical Solution with Verification

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Journal of Applied Mathematics and Physics 2021年第1期9卷 146-175页

作者： Luo Li Tariq A. Khraishi abu bakar Siddique Mechanical Engineering Department University of New Mexico Albuquerque NM USA

The strain and stress fields of a rectangular dislocation loop in an isotropic solid that is a semi-infinite medium (half medium) are developed here for a Volterra-type dislocation. Specifically, the loop is parallel to the free surface of the solid. The elastic fields of the dislocation loop are developed by integrating the displacement equation of infinitesimals dislocation loops over a finite rectangular loop area below the free surface. The strains and stress then follow from the small strain tensor and Hooke’s law for isotropic materials, respectively. In this paper, analytical verification and numerical verification for the elastic fields are both demonstrated. Equilibrium equations and strain compatibility equations are applied in the verification. Also, a comparison with a newly-developed numerical method for dislocations near a free surface is performed as well. The developed solution is a function of the loop depth beneath the surface and can be used as a fundamental solution to solve elasticity, plasticity or dislocation problems.

关键词： Dislocation Loops Free Surfaces Volterra Image-Stresses Semi-Infinite Medium

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Synthesis of Barium Nickel Titanium Oxide Stabilized by Citric Acid

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Modeling and Numerical Simulation of Material Science 2013年第1期3卷 23-27页

作者： K. Y. Chew M. abu bakar N.H.H. abu bakar Nanoscience Research Laboratory School of Chemical Sciences Universiti Sains Malaysia 11800 USM Pulau Pinang Malaysia.

Barium nickel titanium oxide particles (Ba2NiTi5O13) were synthesized in the presence of citric acid by using a two step sol-gel method followed by calcination. The addition of citric acid as a stabilizer (mole ratio of 0.5, 1.0, 2.0, 4.0) resulted in the formation of Ba2NiTi5O13 particles with various morphology (i.e. sphere, cube, rod). These various morphology changes were deduced to be caused by citric acid that tends to absorbed on certain dimension of the Ba2NiTi5O13 particles when different concentration of citric acid was added. Besides that, the growth of Ba2NiTi5O13 particles from incorporation of bulky micelles which act as a protective 'shell' that control particle sizes by attaching on the surfaces of particles.

关键词： Barium Nickel Titanium Oxide Citric Acid Morphology

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利用深度学习进行植物叶片病害检测

利用深度学习进行植物叶片病害检测

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作者： LASKAR MD abu bakar 西南科技大学

学位级别：硕士

植物叶病对粮食安全构成威胁,由于基础设施不足,一些地区的及时诊断更加复杂。本文旨在利用先进的深度学习方法,特别是YOLOv5模型,解决农业中植物叶病检测的重要问题。其目的是为检测植物叶片疾病提供一种可靠有效的解决方案。引言强调... 详细信息

植物叶病对粮食安全构成威胁,由于基础设施不足,一些地区的及时诊断更加复杂。本文旨在利用先进的深度学习方法,特别是YOLOv5模型,解决农业中植物叶病检测的重要问题。其目的是为检测植物叶片疾病提供一种可靠有效的解决方案。引言强调了植物疾病在全球范围内的重大影响,包括全球后果和财务影响。它强调了早期识别以减轻这些影响的迫切需要。这项研究仔细研究了深度学习方法的复杂使用,其动机是技术改造农业的潜力。我们使用精心选择的番茄数据集训练YOLOv5模型,以证明其在区分健康和不健康植物叶片方面的熟练程度。该数据集包括九类不同的疾病。该模型具有92.6%的显著平均精度,表明在检测疾病方面具有显著的准确性。农业中植物叶病的识别遇到了几个复杂的挑战,使用Flask框架有效实施学习模型意味着在实际使用深度学习来解决这些问题方面取得了实质性进展。多模式方法优先考虑研究,以加强农业技术并确保全球粮食安全。此外,它在推进疾病检测的科学知识和为未来的进展奠定基础方面发挥着至关重要的作用。为了实现这些目标,本文研究了不同的混合建模技术,使用深度学习、基于机制的方法和数据集成驱动的观点来发现植物叶片上的疾病。本文的主要创新和贡献如下:利用YOLOv5和Flask框架有效鉴定植物病害(1)一种用于疾病检测的高级深度学习框架本文使用YOLOv5模型来解决植物叶片疾病的诊断问题,这是一种以对象检测的快速性和准确性而闻名的尖端深度学习方法。使用一个严格策划的番茄叶片数据集,该数据集包含九种独特疾病类别的健康和生病叶片的图片,该机器被训练以高精度区分各种情况。YOLOv5的训练模型具有惊人的92.6%的平均准确率,证明了其有效诊断植物叶片疾病的能力。这种提高的准确度对于快速准确的疾病识别至关重要,这可能会对作物管理的选择和结果产生重大影响。(2)实际实现和用户可访问性利用Flask框架(一种允许在农业环境中实时检测疾病的轻量级网络框架)进行训练后,YOLOv5模型的熟练实现是该研究向前迈出的重要一步。这种实现方式保证了最终用户可以通过易于使用的界面访问深度学习模型。重点是开发一个用户友好的界面,使农民和农业专家能够轻松接受和使用这项技术。这种对可访问性的强调对于深度学习解决方案在现实农业应用中的实际效果和广泛接受至关重要。(3)对农业技术和未来研究的贡献。这项研究在扩大农业技术和改善全球粮食安全方面处于领先地位。通过建立深度学习用于植物疾病检测的可行性和有效性,该研究为未来的发展和与物联网设备和无人机等其他技术的集成铺平了道路。这篇论文极大地增加了我们对植物疾病检测的科学知识,并为未来的研究建立了坚实的框架,以提高全球粮食安全和可持续性。它强调了持续研究和技术发展的潜力,以促进农业方法的进一步进步。

关键词：植物疾病检测深度学习 YOLOv5 Flask 农业

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多盘连续可变工作间隙磁流变制动器仿真与验证

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重庆大学学报 2024年第8期47卷 26-38页

作者：李东恒王娜 Saiful Anuar abu bakar 宋万里马来西亚理工大学汽车发展中心马来西亚新山81310 马来西亚理工大学机械工程学院马来西亚新山81310 柳州职业技术大学机电工程学院广西柳州545006 东北大学机械工程与自动化学院沈阳110819

为提高磁流变制动器制动能效,提出一种多盘连续可变磁流变液工作间隙结构的磁流变制动器。在ANSYS workbench环境下完成不同电流、间隙状态下的三维静态磁场仿真,对磁场沿工作间隙分布状况进行分析,通过试验台架对制动器性能进行测试。... 详细信息

为提高磁流变制动器制动能效,提出一种多盘连续可变磁流变液工作间隙结构的磁流变制动器。在ANSYS workbench环境下完成不同电流、间隙状态下的三维静态磁场仿真,对磁场沿工作间隙分布状况进行分析,通过试验台架对制动器性能进行测试。结果表明,磁流变液工作区域磁矢量分布相对均匀,无明显积聚现象,磁路设计合理。理论与实验结果变化趋势基本吻合,但在电流较大时,两者之间误差呈逐渐增大趋势。制动力矩在0~2.5 A电流变化区间增速较快,而在2.5~4.0 A区间明显放缓,最大力矩达到146.4 N·m,较间隙未改变状态增加25.80%。设计的制动器TVR值达到48.81 kN·m/m^(3),较传统磁流变制动器结构更紧凑,力矩调节范围更广,设计思路及实验结论对磁流变制动器结构的进一步研究具有借鉴意义。

关键词：磁流变液楔形工作间隙连续可变制动性能

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Utilization of microwave steam pyrolysis to produce biochar for thermal energy storage

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Waste Disposal and Sustainable Energy 2022年第4期4卷 335-341页

作者： Wahap bin abu bakar Peter Nai Yuh Yek Kah Yein Cheong Augustine Chioma Affam Chee Chung Wong Rock Keey Liew Yie Hua Tan Su Shiung Lam Centre for Research of Innovation and Sustainable Development University of Technology SarawakNo.1Jalan University96000SibuMalaysia Centre on Technological Readiness and Innovation in Business Technopreneurship(CONTRIBUTE) University of Technology Sarawak96000SibuSarawakMalaysia NV Western PLT No.208BSecond FloorMacalister Road10400GeorgetownPenangMalaysia Department of Chemical and Energy Engineering Faculty of Engineering and ScienceCurtin University MalaysiaCDT 25098009MiriSarawakMalaysia Higher Institution Centre of Excellence(HICoE) Institute of Tropical Aquaculture and Fisheries(AKUATROP)Universiti Malaysia Terengganu21030 Kuala NerusTerengganuMalaysia

Microwave steam pyrolysis(MSP)is an innovative thermochemical approach to converting biomass into high-quality biochar using steam to improve the dielectric heating of microwave *** shows high fixed carbon and carbon contents at a maximum temperature of 550℃in 10 *** MSP achieved a heating rate of 112℃/min from 200℃to 400℃to produce biochar ***,the thermal properties of biochar in microwave heating were investigated in this study to explore its potential as a microwave heat-absorbent *** is able to perform volumetric and controllable heating to the ***,biochar shows good microwave heat absorbency,storing and transferring heat *** temperature profile of three different sizes of biochar was investigated to examine the efficiency of biochar in heat absorption from microwave *** was found that the powder form of biochar showed a higher heat transfer rate of 40℃/min and a low cooling rate of 7.5℃/*** presented results are useful for evaluating the application of biochar as a promising medium for heat storage systems.

关键词： Microwave Steam Pyrolysis Biochar Thermal Storage

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Relationship between Concentration and Location of theHerbal Industry

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Journal of Environmental Science and Engineering(B) 2019年第5期8卷 186-189页

作者： Rohana Abd Rahman Ariff Fahmi abu bakar Economic and Strategic Analysis Programme Forest Research Institute MalaysiaKepong Selangor 52109Malaysia

Malaysia aspires to become developed and high income nation by year 2020. Under the Tenth Malaysia Plan, herbal industry was the first Entry Point Project for Agricultural National Key Economic Area in Economic Transformation Programme. To understand the current status of the herbal industry, FRIM (Forest Research Institute Malaysia) conducted the survey on 6,923 herbal chain players, consisted from upstream to downstream activities. A face-to-face interview was conducted using a structured questionnaire to gather the information. This paper highlighted the relationship between concentration of the herbal industry and urbanization’s status of the areas. The finding shows that a statistically significant difference exists between category of herbal activities and status of the areas. The upstream activities are more concentrated in rural areas, while most of downstream activities in urban areas. It is in line with central place of theory on how settlements and places are located in relation to one another and their functions. Therefore, to further develop the herbal industry, the government should consider strategic location by category of industrial activities in policies planning, programmes implementation and providing infrastructural support needed by the industry.

关键词： Upstream downstream herbal industry industrial location central place theory

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Bioengineered silver nanoparticles induced apoptosis through upregulation of caspase 3 and caspase 8 proteins in breast adenocarcinoma MDA-MB-231 cells and impede angiogenesis

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Particuology 2024年第12期95卷 252-264页

作者： Shahnaz Majeed Nurul Izzah Binti abu bakar Mohammad Danish Afzan Binti Mahmad Mohamad Nasir Mohamad Ibrahim Norul Aini Zakariya Sreenivas Patro Sisinthy Ravindran Muthukumarasamy Abdulaziz M.Alanazi Mohammed Tahir Ansari Ohoud A.Jefri Faculty of Pharmacy and Health Sciences Universiti Kuala LumpurRoyal College of Medicine PerakIpoh30450Malaysia Bioresource Technology Section School of Industrial TechnologyUniversiti Sains Malaysia11800PenangMalaysia Laboratory Department Universiti Kuala LumpurRoyal College of Medicine PerakIpoh30450Malaysia School of Chemical Sciences Universiti Sains Malaysia11800PenangMalaysia School of Pharmacy Faculty of Science and EngineeringUniversity of Nottingham MalaysiaSemenyih-43500SelangorMalaysia Department of Chemistry Faculty of ScienceIslamic University of MadinahMadinah42351Saudi Arabia Department of Biological Science Faculty of ScienceKing Abdulaziz University Jeddah21589Saudi Arabia Department of Biology Faculty of ScienceTaibah UniversityAl-Madinah Al MunawarahSaudi Arabia Nanotechnology Group Faculty of Science and EngineeringUniversity of Nottingham MalaysiaSemenyih-43500SelangorMalaysia

In recent years,a lot of research has been done on silver nanoparticles(SNP)due to their numerous applications in the biomedical,pharmaceutical,and drug delivery *** this present study SNP were green synthesized using Melicope lunu-ankenda(***-ankenda)leaf *** addition of AgNO3 causes a color change.L-arginine addition results in further colour changes confirming conjugation.A UV–Vis spectrophotometric examination showed that the absorption peak for SNP was 435 nm,while the peak for L-arginine SNP(cSNP)was 422 *** analysis confirmed the association of amides and amines with *** spherical nature of the silver was disclosed by SEM,and its elemental character is verified by *** thermal stability of the nanoparticles is determined by TGA analysis,while TEM examination verifies their spherical *** the MTT assay,these cSNP exhibited outstanding toxicity analysis(IC5038.72μg/ml)against MDA-MB-231 *** cSNP causes damage to the mitochondria(JC1 staining),which causes oxidative stress and the production of ROS with 83%of DCF expression in cancer ***,as demonstrated by the Comet assay and DAPI,these cSNP cause good DNA damage in the treated ***,using flow cytometry,cSNPs potentially trigger apoptosis by triggering the expression of caspase 3 and caspase 8 ***,through CAM,cSNP demonstrated strong anti-angiogenesis activity by reducing the number of blood vessel *** findings suggest that cSNP may be crucial for drug delivery and cancer treatment.

关键词： Silver nanoparticles TEM Anti-angiogenesis DAPI ROS

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Life Threatening Stridor Due to Primary Laryngeal Tuberculosis

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International Journal of Otolaryngology and Head & Neck Surgery 2024年第1期13卷 62-69页

作者： Siti Aisyah Mohamed Azreen Zaira abu bakar Mawaddah Azman Otorhinolaryngology Department Hospital Ampang Selangor Malaysia Otorhinolaryngology Department Faculty of Medicine Universiti Kebangsaan Malaysia Kuala Lumpur Malaysia Otorhinolaryngology Department Hospital Kuala Lumpur Kuala Lumpur Malaysia

Tuberculosis is a potentially serious infectious disease. In otorhinolaryngology practice, lymph node infection is the most common site of predilection followed by the larynx. Laryngeal tuberculosis (LTB) typically presents with dysphagia, odynophagia and hoarseness. We reported a case of primary LTB presenting with acute upper airway obstruction and respiratory distress mimicking acute supraglottitis which requires emergency tracheostomy. Therefore, in acute upper airway obstruction, the appropriate initial investigation should be done to rule out TB to make sure early treatment can be given and it may prevent complications of disease to the patient. .

关键词： Extra-Pulmonary Granulomatous Infection Malignancy Upper Airway

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