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Effect of Recycling Cycles on the Mechanical and Damping Properties of Flax Fibre Reinforced Elium Composite:Experimental and Numerical Studies

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Journal of Renewable Materials 2021年第4期9卷 695-721页

作者： Sami Allagui Abderrahim El Mahi Jean-Luc Rebiere Moez Beyaoui anas bouguecha Mohamed Haddar Acoustics Laboratory of Le Mans University Le Mans UniversityLe Mans72085France Laboratory of Mechanics Modelling and Production National School of Engineering of SfaxSfax3038Tunisia

This manuscript deals with the effects of recycling on the static and dynamic properties of flax fibers reinforced thermoplastic *** corresponding thermoplastic used in this work is Elium ***’s the first liquid thermoplastic resin that allows the production of recycled composite parts with promising mechanical *** appeared on the resin market in *** until now,no studies were available concerning how it can be recycled and *** this study,a thermocompression recycling process was investigated and applied to Elium *** fiber-reinforced Elium composites were produced using a resin infusion process and were subjected to different thermomechanical recycling *** each material,five recycling operations were carried out on the raw material.A total of 10 different materials were investigated and tested by means of tensile and free vibration tests to evaluate the effect of recycling on their *** addition,a finite element model of the dynamic problem was developed to evaluate the loss factor and natural frequencies regarding different *** results obtained show that the failure tensile properties of Elium resin as well as flax fiber reinforced composites decrease during recycling ***,recycling induces a rise in the elastic ***,improvement in the dynamic stiffness was observed with recycling *** repeated recycling appeared to have negligible effects on the loss factor of the recycled *** results obtained from the experiment and the numerical analyses were in close agreement.

关键词： Recycling thermoplastic bio-composites thermocompression process tensile properties vibration loss factor

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Damping Analysis and Failure Mechanism of 3D Printed Bio-Based Sandwich with Auxetic Core under Bending Fatigue Loading

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Journal of Renewable Materials 2021年第3期9卷 569-584页

作者： Khawla Essassi Jean-Luc Rebiere Abderrahim El Mahi Mohamed Amine Ben Souf anas bouguecha Mohamed Haddar Acoustics Laboratory of Mans University(LAUM)-UMR CNRS Le Mans UniversityLe Mans6613France Laboratory of Mechanics Modeling and Production(LA2MP) National School of Engineers of SfaxUniversity of SfaxSfaxTunisia

Meta-sandwich composites with three-dimensional(3D)printed architecture structure are characterized by their high ability to absorb *** this paper,static and fatigue 3-point bending tests are implemented on a 3D printed sandwich composites with a re-entrant honeycomb *** skins,core and whole sandwich are manufactured using the same bio-based material which is polylactic acid with flax fiber *** tests are performed in order to evaluate the durability and the ability of this material to dissipate ***,static tests are conducted to study the bending behaviour of the sandwich beams,as well as to determine the failure parameters and the characteristic used in fatigue ***,fatigue analyses were carried out to determine the fatigue resistance of these *** effects of the core density on the stiffness,hysteresis loop,energy absorption and loss factor,for two loading level,are ***,the behaviour of this sandwich composite with re-entrant honeycomb core is compared with that of sandwiches with different core *** results show that sandwich with high core density dissipate more energy,which results higher loss *** determined properties offer the most sensitive indicators of sandwich composite damage during its *** work aims to determine the static and fatigue properties of this material,thus,study its potential applications in industry.

关键词： Auxetic structure fatigue damping bio-sandwich composite 3D printing

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Pervasive Attentive Neural Network for Intelligent Image Classification Based on N-CDE’s

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Computers, Materials & Continua 2024年第4期79卷 1137-1156页

作者： anas W.Abulfaraj Department of Information Systems Faculty of Computing and Information TechnologyKing Abdulaziz UniversityRabigh21911Saudi Arabia

The utilization of visual attention enhances the performance of image classification *** attentionbased models have demonstrated notable performance,but many of these models exhibit reduced accuracy when confronted with inter-class and intra-class similarities and ***-Controlled Differential Equations(N-CDE’s)and Neural Ordinary Differential Equations(NODE’s)are extensively utilized within this ***’s possesses the capacity to effectively illustrate both inter-class and intra-class similarities and differences with enhanced *** this end,an attentive neural network has been proposed to generate attention maps,which uses two different types of N-CDE’s,one for adopting hidden layers and the other to generate attention *** distinct attention techniques are implemented including time-wise attention,also referred to as bottom N-CDE’s;and element-wise attention,called topN-CDE’***,a trainingmethodology is proposed to guarantee that the training problem is sufficiently *** classification tasks including fine-grained visual classification andmulti-label classification,are utilized to evaluate the *** proposedmethodology is employed on five publicly available datasets,including CUB-200-2011,ImageNet-1K,PASCAL VOC 2007,PASCAL VOC 2012,and MS *** obtained visualizations have demonstrated that N-CDE’s are better appropriate for attention-based activities in comparison to conventional NODE’s.

关键词： Differential equations neural-controlled DE image classification attention maps N-CDE’s

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Towards vehicle electrification:A mathematical prediction of battery electric vehicle ownership growth,the case of Turkey

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Green Energy and Intelligent Transportation 2024年第4期3卷 39-43页

作者： anas Alatawneh Duha Ghunaim Budapest University of Technology and Economics 1111 BudapestMűegyetem rkp.3Hungary Bahcesehir University34349 BeşiktaşİstanbulYıldızÇırağan Cd.Türkiye

Many countries are relying on electric vehicles to achieve their future greenhouse gas reduction targets;thus,they are setting regulations to force car manufacturers to a complete shift into producing fully electric vehicles,which will significantly influence the adoption rates of electric *** research investigates the temporal evolution of battery electric vehicle(BEV)ownership growth in Turkey,drawing insights from both historical and current *** employing and optimizing the Gompertz model,we provide a year-by-year projection of BEV ownership rates,aiding in exploring the anticipated timeline for BEV market *** findings indicate that the introduction of BEVs into the Turkish motorization market is poised to push further market saturation by approximately 15 years,to occur in around 2095 as opposed to ***,our analysis underscores the rapid growth pace in BEV ownership compared to the ownership of internal combustion engine vehicles(ICEVs).The main aim of this research is to provide Turkish policymakers and transport planners with solid insights into how the vehicle market will perform in the short and long run,allowing them to prepare a smooth transition from traditional vehicles to BEVs.

关键词： Electric vehicles Gompertz Forecasting Adoption Diffusion

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Computational Fluid Dynamics Approach for Predicting Pipeline Response to Various Blast Scenarios: A Numerical Modeling Study

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Computer Modeling in Engineering & Sciences 2024年第9期140卷 2747-2777页

作者： Farman Saifi Mohd Javaid Abid Haleem S.M.anas Department of Mechanical Engineering Jamia Millia Islamia(A Central University)New Delhi110025India Department of Civil Engineering Jamia Millia Islamia(A Central University)New Delhi110025India

Recent industrial explosions globally have intensified the focus in mechanical engineering on designing infras-tructure systems and networks capable of withstanding blast *** centered on high-profile facilities such as embassies and petrochemical plants,this concern now extends to a wider array of infrastructures and *** and scholars increasingly prioritize structural safety against explosions,particularly to prevent disproportionate collapse and damage to nearby *** has further amplified the reliance on oil and gas pipelines,making them vital for urban life and prime targets for terrorist ***,there is a growing imperative for computational engineering solutions to tackle blast loading on pipelines and mitigate associated risks to avert *** this study,an empty pipe model was successfully validated under contact blast conditions using Abaqus software,a powerful tool in mechanical engineering for simulating blast effects on buried *** a Eulerian-Lagrangian computational fluid dynamics approach,the investigation extended to above-surface and below-surface blasts at standoff distances of 25 and 50 *** descriptions in the numerical model relied on Abaqus’default mechanical *** analysis revealed varying pipe performance,with deformation decreasing as explosion-to-pipe distance *** explosion’s location relative to the pipe surface notably influenced deformation levels,a key finding highlighted in the ***,quantitative findings indicated varying ratios of plastic dissipation energy(PDE)for different blast scenarios compared to the contact blast(P0).Specifically,P1(25 mm subsurface blast)and P2(50 mm subsurface blast)showed approximately 24.07%and 14.77%of P0’s PDE,respectively,while P3(25 mm above-surface blast)and P4(50 mm above-surface blast)exhibited lower PDE values,accounting for about 18.08%and 9.67%of P0’s PDE,***

关键词： Blast loading computational fluid dynamics computer modeling pipe networks response prediction structural safety

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Pulmonary Edema and Pleural Effusion Detection Using Efficient Net-V1-B4 Architecture and AdamW Optimizer from Chest X-Rays Images

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Computers, Materials & Continua 2024年第7期80卷 1055-1073页

作者： anas AbuKaraki Tawfi Alrawashdeh Sumaya Abusaleh Malek Zakarya Alksasbeh Bilal Alqudah Khalid Alemerien Hamzah Alshamaseen Faculty of Information Technology Al-Hussein Bin Talal UniversityMa’an71111Jordan College of Information and Communications Technology(ICT) Tafila Technical UniversityTafila66110Jordan IOTISTIC Solutions Company Amman11185Jordan

This paper presents a novelmulticlass systemdesigned to detect pleural effusion and pulmonary edema on chest Xray images,addressing the critical need for early detection in healthcare.A new comprehensive dataset was formed by combining 28,309 samples from the ChestX-ray14,PadChest,and CheXpert databases,with 10,287,6022,and 12,000 samples representing Pleural Effusion,Pulmonary Edema,and Normal cases,***,the preprocessing step involves applying the Contrast Limited Adaptive Histogram Equalization(CLAHE)method to boost the local contrast of the X-ray samples,then resizing the images to 380×380 dimensions,followed by using the data augmentation *** classification task employs a deep learning model based on the EfficientNet-V1-B4 architecture and is trained using the AdamW *** proposed multiclass system achieved an accuracy(ACC)of 98.3%,recall of 98.3%,precision of 98.7%,and F1-score of 98.7%.Moreover,the robustness of the model was revealed by the Receiver Operating Characteristic(ROC)analysis,which demonstrated an Area Under the Curve(AUC)of 1.00 for edema and normal cases and 0.99 for *** experimental results demonstrate the superiority of the proposedmulti-class system,which has the potential to assist clinicians in timely and accurate diagnosis,leading to improved patient ***,ablation-CAM visualization at the last convolutional layer portrayed further enhanced diagnostic capabilities with heat maps on X-ray images,which will aid clinicians in interpreting and localizing abnormalities more effectively.

关键词： Image classification decision support system EfficientNet-V1-B4 AdamW optimizer pulmonary edema pleural effusion chest X-rays

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Does Smoking Weaken the Immune System: A Narrative Review

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Health 2024年第6期16卷 553-560页

作者： anas Malik Radif Alubaidi Nevada USA

Smoking has a complex impact on the immune system, affecting both innate and adaptive immunity. It can exacerbate pathogenic immune responses and attenuate defensive immunity, leading to a higher susceptibility to infections and certain diseases. The chemicals in cigarette smoke, such as nicotine and carbon monoxide, can alter immune cell functions and inflammatory responses. Smoking can also have long-term effects on the immune system, with some changes persisting even after quitting [1]. According to a Penn Medicine Physician, the Medical Oncologist Dr. David Porter, “People who are smokers tend to get sicker from infections”, “It may be that smoking impacts the immune system’s ability to respond appropriately”. Thus, such individuals within smoking exposure history might be considered as immunocompromised due to the altered and weakened immune system. Cigarette smoking is a prevalent habit with far-reaching health implications. Among its many adverse effects, smoking significantly alters the immune system’s functionality [1].

关键词： Smoking Immunity Immune System Immunocompromised E-Cigarettes Hookahs

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Nonlinear Study on the Mechanical Performance of Built-Up Cold-Formed Steel Concrete-Filled Columns under Compression

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Computer Modeling in Engineering & Sciences 2024年第6期139卷 3435-3465页

作者： Oulfa Harrat Yazid Hadidane S.M.anas Nadhim Hamah Sor Ahmed Farouk Deifalla Paul O.Awoyera Nadia Gouider Civil Engineering Laboratory Faculty of TechnologyDepartment of Civil EngineeringBadji Mokhtar-Annaba UniversityP.O.Box 12Annaba23000Algeria Department of Civil Engineering Faculty of Engineering and TechnologyJamia Millia Islamia(A Central University)New Delhi110025India Civil Engineering Department University of GarmianKalar46021Iraq Department of Civil Engineering Harran UniversitySanliurfa63510Turkey Structural Engineering and Construction Management Department Future University in EgyptNew Cairo11835Egypt Department of Civil Engineering Covenant UniversityOta112233Nigeria

Given their numerous functional and architectural benefits,such as improved bearing capacity and increased resistance to elastic instability modes,cold-formed steel(CFS)built-up sections have become increasingly developed and used in recent years,particularly in the construction *** paper presents an analytical and numerical study of assembled CFS two single channel-shaped columns with different slenderness and configurations(backto-back,face-to-face,and box).These columns were joined by double-row rivets for the back-to-back and box configurations,whereas they were welded together for the face-to-face *** built-up columns were filled with ordinary concrete of good *** element models were applied,using ABAQUS software,to assess mechanical performance and study the influence of assembly techniques on the behavior of cold-formed columns under axial *** approaches based on Eurocode 3 and Eurocode 4 recommendations for un-filled and concrete-filled columns respectively were followed for the numerical analysis,and concrete confinement effects were also considered per American Concrete Institute(ACI)standards for face-to-face and box *** obtained results indicated a good correlation between the numerical results and the proposed analytical methodology which did not exceed 8%.The failure modes showed that the columns failed due to instabilities such as local and global buckling.

关键词： Cold-formed steel built-up sections slenderness rivets welded axial compression analytical approaches confinement buckling

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Complexity of the Contexts:Features of Private Tutoring and Units for Comparison in the GCC Countries of the Middle East

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ECNU Review of Education 2024年第1期7卷 42-65页

作者： Mark Bray anas Hajar East China Normal University&The University of Hong Kong Nazarbayev University

Purpose:Private supplementary tutoringwidely known as shadow education because of the ways in which it mimics regular schooling-is increasingly visible across the *** Middle East is no exception,though the phenomenon has received relatively little attention in the English-language *** article maps some key features of shadow education,identifying ways in which contextual forces have shaped ***/Approach/Methods:The article focuses on patterns across and within the six members of the Gulf Cooperation Council(GCC),namely Bahrain,Kuwait,Oman,Qatar,Saudi Arabia,and the United Arab *** draws on literature in both Arabic and English and shows the value of multipleunits of ***:Private tutoring has a long history as a significant phenomenon in some GCC countries,but in others developed more *** governments have had active policies to dampen the phenomenon,but with little *** in the complex dynamics include social,economic andcultural ***:The article assembles literature from around the region,noting both commonalities and diversities among GCC *** contributes to the global literature by providing the regional mapping from this specific part of the world and by showing comparisons with other world regions.

关键词： Cultural forces Gulf Cooperation Council Middle East policies private tutoring shadow education

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Deterministic relation between thermalphonon dressings and a non-Hermitian multi-Fano interferences router in iondoped microcrystals

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Chip 2024年第1期3卷 24-34页

作者： Huanrong Fan Faizan Raza anas Mujahid Peng Li Yafen Wang Haitian Tang Muhammad Usman Bo Li Changbiao Li Yanpeng Zhang Key Laboratory for Physical Electronics and Devices of the Ministry of Education&Shaanxi Key Lab of Information Photonic Technique Xi’an Jiaotong UniversityXi’an 710049China Center for Regenerative and Reconstructive Medicine Med-X InstituteThe First Affiliated Hospital of Xi’an Jiaotong UniversityXi’an 710061China State Key Lab of Modern Optical Instrumentation Centre for Optical and Electromagnetic ResearchCollege of Optical Science and EngineeringInternational Research Center for Advanced PhotonicsZhejiang UniversityHangzhou 310058China

The multi-Fano interference,which is obtained through the simultaneous acquisition of bright and dark states in different phase transitions of Eu3+:BiPO4(7:1,6:1,1:1,and 0.5:1)and Eu3+:NaYF4(1:1/4)crystals,were reported in this *** spontaneous four-wave mixing and multidressed fluorescence(multiorder)were adopted to optimize the strong photon–phonon nested dressing effect,which results in more obvious multi-Fano ***,the multi-Fano is produced through interference in continuous and multibound ***,five multi-Fano dips are originated from the nested five dressings(one photon and four phonons)under symmetrical splitting of 7F1 energy *** is found that the pure H-phase(0.5:1)sample exhibits the strongest photon–phonon dressed effect(five Fano dips).Further,high-order non-Hermitian exceptional points in multi-Fano interference were investigated by adjusting the ratio of Rabi frequency to dephase rate through nested photon and phonon *** experimental results are validated by theoretical simulations,which may be applied to designing optoelectronic devices such as non-Hermitian multi-Fano interferences(multichannel)router.

关键词： Multi-Fano interferences Thermal-phonon dressings Non-Hermitian Router

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