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Investigating the Effects of Eichhornia Crassipes Biodiesel and Liquefied Petroleum Gas on the Performance and Emissions of a Dual-Fuel Engine

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Fluid Dynamics & Materials Processing 2023年第9期19卷 2329-2343页

作者： Hawraa s.Mohammed mahmoud A.Mashkour Mechanical Engineering Department University of Technology-IraqBagdadIraq

This study considers the effect of Eichhornia Crassipes Biodiesel(ECB)blends on the performances,combustion,and emission characteristics of a direct injection compression ignition engine operated in a dual-fuel mode(DFM)and equipped with an Exhaust gas recirculation technique(EGR).In particular,a single-cylinder,four-stroke,water-cooled diesel engine was utilized and four modes of fuel operation were considered:mode I,the engine operated with an ordinary diesel fuel;mode II,the engine operated with the addition of 2.4 L/min of lique-ﬁed petroleum gas(LPG)and 20%EGR;mode III,20%ECB with 2.4 L/min LPG and 20%EGR;mode IV,40%ECB with 2.4 L/min LPG and 20%*** operation conditions were constant engine speed(1500 rpm),var-iation of load(25%,50%,75%,and 100%),full load,with a compression ratio of 18,and a time injection of 23°BTDC(Before top died center).With regard to engine emissions,carbon dioxide(CO_(2)),carbon monoxide(CO),hydrocarbons(UHC),and nitrogen oxide(NOX)were measured using a gas *** smoke opacity was measured using an OPABOX smoke *** comparing the results related to the different modes with mode I at full load,the BTE(Brake thermal efﬁciency)increased by 20.17%,11.45%,and 12.66%with modes II,III,and IV,*** comparison to the results for mode II,the BTE decreased due to the combustion of ECB blends by 7.26%and 6.24%for mode III and mode IV,respectively,at full *** comparison to mode II,the Brake speciﬁc energy consumption(BsEC)increased with the ECB *** ECB blends,there is a noticeable decrease in the CO,CO_(2),and UHC emissions at a partial ***,the 20%ECB has no effect on CO emissions at full *** modes II and IV,the CO_(2)increased by 33.33%and 19%,respectively,while the UHC emissions were reduced by 14.49%for mode III and 26.08%for mode *** smoke of mode III was lower by 7.21%,but for mode IV,it was higher by 12.37%.In addition,with mode III and mode IV,the NOx emissions increased by 30.50%

关键词： Eichhornia Crassipes Biodiesel dual-fuel engine liqueﬁed petroleum gas combustion diesel engine brake thermal efﬁciency

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secret Key Optimization for secure speech Communications

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Computers, Materials & Continua 2022年第8期72卷 3025-3037页

作者： Osama s.Faragallah mahmoud Farouk Hala s.El-sayed Department of Information Technology College of Computers and Information TechnologyTaif UniversityP.O.Box 11099Taif 21944Saudi Arabia Department of Computer science and Engineering Faculty of Electronic EngineeringMenoufia UniversityMenouf 32952Egypt Department of Electrical Engineering Faculty of EngineeringMenoufia UniversityShebin El-Kom 32511Egypt

This paper answers three essential questions for audio speech cryptosystems in time and discrete transform *** first question is,what are the best values of sub-keys that must be used to get the best quality and security for the audio cryptosystem in time and discrete transform *** second question is the relation between the number of sub-keys,the number of secret keys used,and the audio speech signal block’s ***,how many possible secret keys can be used to get the best quality and security results for the audio speech cryptosystem in time and discrete transform *** audio cryptosystem discussed before in recent research is applied to answer the three previous *** simulation results and analysis answer all three questions;first,there is no specific,well-defined format or rule for sub-key values that must be used to get a better *** the second question,yes,there is a direct relationship between the number of applicable keys,number of available sub-keys,and block size of speech audio signal and formulated into a first-order *** the third question,each discrete transform domain has a specific acceptable range of sub-keys that imply a particular number of keys that can be used to get a better cryptosystem.

关键词： Audio cryptosystem chaotic baker map secret key size

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A systematic review of progenitor survival and maturation in Parkinsonian models

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Neural Regeneration Research 2025年第11期20卷 3172-3178页

作者： Giulia Comini Eilís Dowd Pharmacology&Therapeutics and Galway Neuroscience Center University of GalwayGalwayIreland

stem cell-based brain repair is a promising emergent therapy for Parkinson's disease based on years of foundational research using human fetal donors as a cell *** current therapeutic options for patients,this approach has the potential to provide longterm stem cell–derived reconstruction and restoration of the dopaminergic input to denervated regions of the brain allowing for restoration of certain functions to *** ultimate clinical success of stem cell–derived brain repair will depend on both the safety and efficacy of the approach and the latter is dependent on the ability of the transplanted cells to survive and differentiate into functional dopaminergic neurons in the Parkinsonian *** the pre-clinical literature suggests that there is considerable variability in survival and differentiation between studies,the aim of this systematic review was to assess these parameters in human stem cell-derived dopaminergic progenitor transplant studies in animal models of Parkinson's disease.A defined systematic search of the PubMed database was completed to identify relevant studies published up to March *** screening,76 articles were included in the analysis from which 178 separate transplant studies were *** these,graft survival could be assessed in 52 studies and differentiation in 129 ***,we found that graft survival ranged froms transplanted,with a median of 51%of transplanted cells surviving in the brain;while dopaminergic differentiation of the cells ranged from 0% to 46% of cells transplanted with a median of 3%.This systematic review suggests that there is considerable scope for improvement in the differentiation of stem cell-derived dopaminergic progenitors to maximize the therapeutic potential of this approach for patients.

关键词： cell replacement therapy differentiation embryonic stem cells graft induced pluripotent stem cells Parkinson's disease survival transplant

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Development of AZ91/siC surface composite by FsP:effect of vibration and process parameters on microstructure and mechanical characteristics

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Advances in Manufacturing 2020年第1期8卷 82-96页

作者： Behrouz Bagheri mahmoud Abbasi Department of Mining and Metallurgy Amirkabir University of TechnologyTehranIran Faculty of Engineering University of Kashan.KashanIran

A surface composite layer enhances the mechanical characteristics of a surface while retaining the properties of the base *** stir processing(FsP)is a method for forming surface metal matrix composites(sMMCs)that reinforce a surface with *** the current study,a new method entitled friction stir vibration processing(FsVP)was applied to form sMMCs on the surface of AZ91 magnesium alloy with siC particles as the reinforcing *** to FsP,in FsVP,the workpiece was vibrated normal to the processing line while the tool rotated and *** microstructure and mechanical properties of friction stir(Fs)and friction stir vibration(FsV)processed specimens were ***,the effects of vibration frequency and process parameters on different characteristics of Fs and FsV processed specimens were *** results showed that the stir zone grains for FsV processed specimens were finer than those for Fs processed specimens,and the second phase particles(siC particles)had a more homogenous distribution in the former specimens than in the latter *** was related to the effect of workpiece vibration during FsVP,which increased the material deformation and led to enhanced dynamic recrystallization and the breakdown of agglomerated siC *** results indicated that the stir zone grain size decreased,and the distribution homogeneity of the siC particles increased as vibration frequency *** was also observed that the stir zone grain size increased,and the mechanical properties of the processed specimens decreased as tool rotation speed increased.

关键词： Friction stir processing(FsP) Vibration AZ91 magnesium alloy Dynamic recrystallization Microstructure Mechanical properties

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A spatiotemporal algebra in Hadoop for moving objects

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Geo-spatial Information science 2018年第2期21卷 102-114页

作者： Mohamed s.Bakli mahmoud A.sakr Taysir Hassan A.soliman Faculty of Computers and Information Assiut UniversityAssiutEgypt Faculty of Computer and Information sciences Ain Shams UniversityCairoEgypt Universitélibre de Bruxelles BruxellesBelgium

spatiotemporal data represent the real-world objects that move in geographic space over *** enormous numbers of mobile sensors and location tracking devices continuously produce massive amounts of such *** leads to the need for scalable spatiotemporal data management *** systems shall be capable of representing spatiotemporal data in persistent storage and in *** shall also provide a range of query processing operators that may scale out in a cloud ***,very few researches have been conducted to meet this *** paper proposes a Hadoop extension with a spatiotemporal *** algebra consists of moving object types added as Hadoop native types,and operators on top of *** Hadoop file system has been extended to support parameter passing for files that contain spatiotemporal data,and for operators that can be unary or *** the types and operators are accessible for the MapReduce *** an extension allows users to write Hadoop programs that can perform spatiotemporal *** queries may call more than one operator for different jobs and keep these operators running in *** paper describes the design and implementation of this algebra,and evaluates it using a benchmark that is specific to moving object databases.

关键词： spatiotemporal algebra Hadoop MapReduce moving objects

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Unveiling the complexities of microbiologically induced corrosion:mechanisms,detection techniques,and mitigation strategies

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Frontiers of Environmental science & Engineering 2024年第10期18卷 15-48页

作者： mahmoud A.Ahmed safwat A.mahmoud Ashraf A.Mohamed Veolia Water Technologies Cairo 11835Egypt Chemistry department Faculty of ScienceAin Shams UniversityCairo 11566Egypt Physics Department Faculty of ScienceNorthern Border UniversityArar 13211Saudi Arabia

Microbiologically induced corrosion(MIC)is a complex and destructive phenomenon that occurs in various sectors,involving the interaction between microorganisms and metal surfaces,resulting in accelerated corrosion *** review article provides a comprehensive analysis of MIC,encompassing microbial species involved,their metabolic activities,and influential environmental factors driving the corrosion *** mechanisms of MIC,both in the presence and absence of oxygen,are explored,along with the diverse effects of microbes on different types of corrosion and their economic *** and monitoring techniques,including traditional and advanced methods such as microbiological and electrochemical methods,are ***,it examines preventive and control measures,such as the use of biocides and their mechanisms of *** to enhance the performance of these control measures and the effectiveness of antimicrobial agents during disinfection processes,including surfactants and chelators,are ***,the review highlights enzymatic remediation as a sustainable alternative approach,providing detailed *** challenges in mitigating MIC and potential future developments and collaborative opportunities are also *** systematic review is a valuable resource for researchers,industry professionals,and policymakers seeking a comprehensive understanding of the complex phenomenon of MIC and effective strategies for its management.

关键词： Metal failure Biofilm formation Enzymatic remediation Antimicrobial agents Bio-corrosion mechanisms

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Efficient AUV Path Planning in Time-Variant Underwater Environment Using Differential Evolution Algorithm

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Journal of Marine science and Application 2018年第4期17卷 585-591页

作者： s.mahmoud Zadeh D.M.W Powers A.M.Yazdani K.sammut A.Atyabi school of Computer science Engineering and Mathematics Flinders University Tonsley Centre for Maritime Engineering Control and Imaging Flinders University seattle Children's Research Institute University of Washington

Robust and efficient AUV path planning is a key element for persistence AUV maneuvering in variable underwater environments. To develop such a path planning system, in this study, differential evolution(DE) algorithm is employed. The performance of the DE-based planner in generating time-efficient paths to direct the AUV from its initial conditions to the target of interest is investigated within a complexed 3D underwater environment incorporated with turbulent current vector fields, coastal area,islands, and static/dynamic obstacles. The results of simulations indicate the inherent efficiency of the DE-based path planner as it is capable of extracting feasible areas of a real map to determine the allowed spaces for the vehicle deployment while coping undesired current disturbances, exploiting desirable currents, and avoiding collision boundaries in directing the vehicle to its destination. The results are implementable for a realistic scenario and on-board real AUV as the DE planner satisfies all vehicular and environmental constraints while minimizing the travel time/distance, in a computationally efficient manner.

关键词： Path planning Differential evolution Autonomous underwater vehicles Evolutionary algorithms Obstacle avoidance

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Machine learning in neurological disorders:A multivariate LsTM and AdaBoost approach to Alzheimer's disease time series analysis

Health Care Science

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Health Care science 2024年第1期3卷 41-52页

作者： Muhammad Irfan seyed shahrestani mahmoud Elkhodr school of Computer Data and Mathematical SciencesWestern Sydney UniversitySydneyAustralia school of Engineering and Technology Central Queensland UniversitySydneyAustralia

Introduction:Alzheimer's disease(AD)is a progressive brain disorder that impairs cognitive functions,behavior,and *** detection is crucial as it can slow down the progression of ***,early diagnosis and monitoring of AD's advancement pose significant challenges due to the necessity for complex cognitive assessments and medical ***:This study introduces a data acquisition technique and a preprocessing pipeline,combined with multivariate long short-term memory(M-LsTM)and AdaBoost *** models utilize biomarkers from cognitive assessments and neuroimaging scans to detect the progression of AD in patients,using The AD Prediction of Longitudinal Evolution challenge cohort from the Alzheimer's Disease Neuroimaging Initiative ***:The methodology proposed in this study significantly improved performance *** testing accuracy reached 80%with the AdaBoost model,while the M-LsTM model achieved an accuracy of 82%.This represents a 20%increase in accuracy compared to a recent similar ***:The findings indicate that the multivariate model,specifically the M-LsTM,is more effective in identifying the progression of AD compared to the AdaBoost model and methodologies used in recent research.

关键词： Alzheimer's disease AdaBoost cognitive data multivariate LsTM neuroimaging data

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A machine vision-intelligent modelling based technique for in-line bell pepper sorting

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Information Processing in Agriculture 2023年第4期10卷 491-503页

作者： Khaled Mohi-Alden mahmoud Omid mahmoud soltani Firouz Amin Nasiri Department of Agricultural Machinery Engineering Faculty of Agricultural Engineering and TechnologyUniversity of TehranIran Department of Biosystems Engineering and soil science University of TennesseeKnoxvilleTN 37996USA

The uniformity of appearance attributes of bell peppers is significant for consumers and food *** automate the sorting process of bell peppers and improve the packaging quality of this crop by detecting and separating the not likable low-color bell peppers,developing an appropriate sorting system would be of high importance and *** to standards and export needs,the bell pepper should be graded based on maturity levels and size to five *** research has been aimed to develop a machine vision-based system equipped with an intelligent modelling approach for in-line sorting bell peppers into desirable and undesirable samples,with the ability to predict the maturity level and the size of the desirable bell *** perceptron(MLP)artificial neural networks(ANNs)as the nonlinear modelswere designed for that *** modelswere trained and evaluated through five-fold cross-validation *** optimum MLP classifier was compared with a linear discriminant analysis(LDA)*** results showed that the MLP outperforms the LDA *** processing time to classify each captured image was estimated as 0.2 s/sample,which is fast enough for in-line ***,the optimum MLP model was integrated with a machine vision-based sorting machine,and the developed system was evaluated in the in-line *** performance parameters,including accuracy,precision,sensitivity,and specificity,were 93.2%,86.4%,84%,and 95.7%,*** total sorting rate of the bell pepper was also measured as approximately 3000 samples/h.

关键词： Bell pepper sorting Image processing Machine vision Multilayer perceptron Linear discriminant analysis

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Variant Wasserstein Generative Adversarial Network Applied on Low Dose CT Image Denoising

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Computers, Materials & Continua 2023年第5期75卷 4535-4552页

作者： Anoud A.mahmoud Hanaa A.sayed sara s.Mohamed Department of Mathematics and Computer science Faculty of ScienceNew Valley UniversityNew Valley72511Egypt Department of Computer science College of Computer Science and Engineering Taibah UniversityMedina42221KSA Department of Mathematics Faculty of ScienceAssiut UniversityAssiut71516Egypt

Computed Tomography(CT)images have been extensively employed in disease diagnosis and treatment,causing a huge concern over the dose of radiation to which patients are *** the radiation dose to get a better image may lead to the development of genetic disorders and cancer in the patients;on the other hand,decreasing it by using a Low-Dose CT(LDCT)image may cause more noise and increased artifacts,which can compromise the ***,image reconstruction from LDCT image data is necessary to improve radiologists’judgment and *** study proposed three novel models for denoising LDCT images based on Wasserstein Generative Adversarial Network(WGAN).They were incorporated with different loss functions,including Visual Geometry Group(VGG),structural similarity Loss(ssIM),and structurally sensitive Loss(ssL),to reduce noise and preserve important information on LDCT images and investigate the effect of different types of loss ***,experiments have been conducted on the Graphical Processing Unit(GPU)and Central Processing Unit(CPU)to compare the performance of the proposed *** results demonstrated that images from the proposed WGAN-ssIM,WGAN-VGG-ssIM,and WGAN-VGG-ssL were denoised better than those from state-of-the-art models(WGAN,WGAN-VGG,and sMGAN)and converged to a stable equilibrium compared with WGAN and *** proposed models are effective in reducing noise,suppressing artifacts,and maintaining informative structure and texture details,especially WGAN-VGG-ssL which achieved a high peak-signalto-noise ratio(PNsR)on both GPU(26.1336)and CPU(25.8270).The average accuracy of WGAN-VGG-ssL outperformed that of the state-ofthe-art methods by 1 *** prove that theWGAN-VGG-ssL is more stable than the other models on both GPU and CPU.

关键词： Machine learning deep learning image denoising low dose CT loss function

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