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Optically pumped low-threshold microdisk lasers on a GeSn-on-insulator substrate with reduced defect density

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Photonics Research 2022年第6期10卷 1332-1337页

作者： YONGDUCK JUNG DANIEL BURT LIN ZHANG YOUNGMIN KIM HYO-JUN JOO MELVINA CHEN SIMONE ASSALI oussama moutanabbir CHUAN SENG TAN DONGUK NAM School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore 639798Singapore Department of Engineering Physics École Polytechnique de MontréalMontréalQuébec H3C 3A7Canada

Despite the recent success of GeSn infrared lasers,the high lasing threshold currently limits their integration into practical *** structural defects in epitaxial GeSn layers have been identified as one of the major bottlenecks towards low-threshold GeSn lasers,the effect of defects on the lasing threshold has not been well studied ***,we experimentally demonstrate that the reduced defect density in a GeSn-on-insulator substrate improves the lasing threshold *** first present a method of obtaining high-quality GeSn-oninsulator layers using low-temperature direct bonding and chemical–mechanical ***-temperature photoluminescence measurements reveal that the reduced defect density in GeSn-on-insulator leads to enhanced spontaneous emission and a reduced lasing threshold by0 times andtimes,*** result presents a new path towards pushing the performance of GeSn lasers to the limit.

关键词： GeSn pumped polishing

Faster Region Convolutional Neural Network(FRCNN)Based Facial Emotion Recognition

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Computers, Materials & Continua 2024年第5期79卷 2427-2448页

作者： J.Sheril Angel A.Diana Andrushia TMary Neebha oussama Accouche Louai Saker N.Anand Department of Electronics and Communication Engineering Karunya Institute of Technology and SciencesCoimbatore641114India College of Engineering and Technology American University of the Middle EastEgaila54200Kuwait Department of Civil Engineering Karunya Institute of Technology and SciencesCoimbatore641114India

Facial emotion recognition(FER)has become a focal point of research due to its widespread applications,ranging from human-computer interaction to affective *** traditional FER techniques have relied on handcrafted features and classification models trained on image or video datasets,recent strides in artificial intelligence and deep learning(DL)have ushered in more sophisticated *** research aims to develop a FER system using a Faster Region Convolutional Neural Network(FRCNN)and design a specialized FRCNN architecture tailored for facial emotion recognition,leveraging its ability to capture spatial hierarchies within localized regions of facial *** proposed work enhances the accuracy and efficiency of facial emotion *** proposed work comprises twomajor key components:Inception V3-based feature extraction and FRCNN-based emotion *** experimentation on Kaggle datasets validates the effectiveness of the proposed strategy,showcasing the FRCNN approach’s resilience and accuracy in identifying and categorizing facial *** model’s overall performance metrics are compelling,with an accuracy of 98.4%,precision of 97.2%,and recall of 96.31%.This work introduces a perceptive deep learning-based FER method,contributing to the evolving landscape of emotion recognition *** high accuracy and resilience demonstrated by the FRCNN approach underscore its potential for real-world *** research advances the field of FER and presents a compelling case for the practicality and efficacy of deep learning models in automating the understanding of facial emotions.

关键词： Facial emotions FRCNN deep learning emotion recognition face CNN

Characteristics and trends of pediatric firepit burns: insights for prevention and safety

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World Journal of Pediatric Surgery 2024年第1期7卷 54-58页

作者： Maria Fazal Charbel Chidiac Raheel Ahmad oussama Issa Erica Hodgman Alejandro V Garcia Johns Hopkins School of Medicine BaltimoreMarylandUSA Department of Surgery Division of Pediatric SurgeryJohns Hopkins School of MedicineBaltimoreMarylandUSA Division of the Biological Sciences University of ChicagoChicagoIllinoisUSA School of Medicine American University of BeirutBeirutLebanon

Introduction As fire pits grow in popularity,so do the associated burn *** study examines pediatric fire pit burns characteristics to raise awareness and promote safety *** We conducted a retrospective review of pediatric patients(<21 years)with firepit burns at a tertiary care hospital from 2016 to *** Eighty-four patients were identified,of whom 70.2%were male,with a median age of 62 *** median percent total body surface area burned was 2%(interquartile range(IQR)=1-4).Thirty-five(41.7%)patients were admitted and 7(8.3%)underwent *** and trunk burns had the highest grafting rates(66%and 33%,respectively).The hands(41.7%)and the lower extremities(27.4%)were the most frequently burned body *** leading causes of burns were ashes/hot coals(34.5%),flames(31.0%),and direct contact(25.0%),often resulting from falling into the fire(59.5%)or running or playing in activities near it(26.2%).Thirty-five(41.7%)were admitted for inpatient management,while 49(58.3%)were treated as ***(13.2%)underwent at least one reconstructive surgery,7(8.4%)had at least one rehabilitation visit,and 65(77.4%)had follow-up clinic *** median length of stay was 2 days(IQR=1.0-3.5).The peak months for burns were from August through October(n=40,46.0%),with an increase observed from 10 cases in 2016to 20 cases in *** Given the significant proportion of firepit burns resulting from unsafe fire behaviors,it is crucial that caretakers are aware of proper firepit safety *** ofevidence Il.

关键词： burns admitted prevention

Case Report: Bilateral Intra-Parenchymal Hematomas Caused by Ventricular Flood Complicating Neonatal Salmonella typhi Meningitis

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Open Journal of Pediatrics 2024年第5期14卷 873-877页

作者： oussama Hnini Sahar Messaoudi Mohammed Ech-Chebab Anass Ayyad Rim Amrani Department of Neonatology and Intensive Care Unit Mohammed VI University Hospital Oujda Morocco Faculty of Medicine and Pharmacy of Oujda University Mohammed First Oujda Morocco Maternal Child and Mental Health Research Laboratory Oujda Morocco

Salmonella meningitis is an uncommon condition in neonates, and when it does occur, it is often linked to serious complications, such as subdural collections and abscesses. We present a case involving a 23-day-old neonate diagnosed with Salmonella meningitis, who developed complications including bilateral intra-parenchymal hematomas with ventricular involvement. The infant showed significant improvement following an extended course of systemic antibiotics and supportive care.

关键词： Neonate Meningitis Salmonella Complications

Computation of Minimal Siphons in Petri Nets Using Problem Partitioning Approaches

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IEEE/CAA Journal of Automatica Sinica 2022年第2期9卷 329-338页

作者： Dan You oussama Karoui Shouguang Wang IEEE School of Information and Electronic Engineering(Sussex Artificial Intelligence Institute) Zhejiang Gongshang UniversityHangzhou 310018China

A large amount of research has shown the vitality of siphon enumeration in the analysis and control of deadlocks in various resource-allocation systems modeled by Petri nets(PNs).In this paper,we propose an algorithm for the enumeration of minimal siphons in PN based on problem *** proposed algorithm is an improved version of the global partitioning minimal-siphon enumeration(GPMSE)proposed by Cordone et al.(2005)in IEEE Transactions on Systems,Man,and Cybernetics-Part A:Systems and Humans,which is widely used in the literature to compute minimal *** experimental results show that the proposed algorithm consumes lower computational time and memory compared with GPMSE,which becomes more evident when the size of the handled net grows.

关键词： Index Terms-Petri nets(PNs) problem decomposition resource-allocation systems siphons

Optimizing Decision-Making of A Smart Prosumer Microgrid Using Simulation

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Computers, Materials & Continua 2023年第7期76卷 151-173页

作者： oussama Accouche Rajan Kumar Gangadhari College of Engineering and Technology American University of the Middle EastEgaila 54200Kuwait Operations and IT ICFAI Business SchoolHyderabad501203India

Distributed renewable energy sources offer significant alternatives for Qatar and the Arab Gulf region’s future fuel supply and *** are essential for providing dependable power in difficult-to-reach areas while incorporating significant amounts of renewable energy *** energy-efficient data centers,distributed generation can be used to meet the facility’s overall power *** study primarily focuses on the best energy management practices for a smart microgrid in Qatar while taking demandside load management into *** article looked into a university microgrid in Qatar that primarily aimed to get all of its energy from the *** diesel generators are categorized as a dispatchable distributed generation with energy storage added to handle solar radiation from the sun and high grid power operating costs in the suggested scenario,wind turbines and solar Photovoltaic(PV)are classified as non-dispatchable distributed *** resulting linear math issues are assessed and displayed in MATLAB optimization software using a mixed-integer linear programming(MILP)*** to the simulation results,the suggested energy management strategy reduced the university microgrid’s grid power costs by 38.8%,making it an affordable solution which is somehow greater than the prior case scenario’s 23%*** installed solar system capacity’s effects on the economy,society,and finances were also assessed,and it became clear that the best option for the smart microgrid was determined that would be 325 kW of solar PV,25 kW of wind turbine,and 600 kW of diesel generators,*** the current situation,university administrators are urged to participate in distributed generators and adopt cutting-edge designs for energy storage technologies due to the significant environmental and financial benefits.

关键词： Energy management smart grid prosumer demand-side load management renewable resources wind turbines

Analyzing the ZnO and CH_(3)NH_(3)PbI_(3) as Emitter Layer for Silicon Based Heterojunction Solar Cells

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Computers, Materials & Continua 2023年第1期74卷 575-590页

作者： Jasurbek Gulomov oussama Accouche Rayimjon Aliev Marc AZAB Irodakhon Gulomova Renewable Energy Source Laboratory Andijan State UniversityUzbekistan College of Engineering and Technology American University of the Middle EastKuwait

Today,it has become an important task to modify existing traditional silicon-based solar cell factory to produce high-efficiency silicon-based heterojunction solar cells,at a lower ***,the aim of this paper is to analyze CH_(3)NH_(3)PbI_(3) and ZnO materials as an emitter layer for p-type silicon wafer-based heterojunction solar ***_(3)NH_(3)PbI_(3) and ZnO can be synthesized using the cheap Sol-Gel method and can form n-type *** propose to combine these two materials since CH_(3)NH_(3)PbI_(3) is a great light absorber and ZnO has an optimal complex refractive index which can be used as antireflection *** photoelectric parameters of n-CH_(3)NH_(3)PbI_(3)/p-Si,n-ZnO/p-Si,and n-Si/p-Si solar cells have been studied in the range of 20–200 nm of emitter layer *** has been found that the short circuit current for CH_(3)NH_(3)PbI_(3)/p-Si and n-ZnO/p-Si solar cells is almost the same when the emitter layer thickness is in the range of 20–100 ***,when the emitter layer thickness is greater than 100 nm,the short circuit current of CH_(3)NH_(3)PbI_(3)/p-Si exceeds that of n-ZnO/*** optimal emitter layer thickness for n-CH_(3)NH_(3)PbI_(3)/p-Si and n-ZnO/p-Si was found equal to 80 *** this value,the short-circuit current and the fill factor were estimated around 18.27 mA/cm^(2) and 0.77 for n-CH_(3)NH_(3)PbI_(3)/p-Si and 18.06 mA/cm^(2) and 0.73 for n-ZnO/*** show that the efficiency of n-CH_(3)NH_(3)PbI_(3)/p-Si and n-ZnO/p-Si solar cells with an emitter layer thickness of 80 nm are 1.314 and 1.298 times greater than efficiency of traditional n-Si/p-Si for the same *** findings will help perovskites materials to be more appealing in the PV industry and accelerate their development to become a viable alternative in the renewable energy sector.

关键词： Solar cell CH_(3)NH_(3)PbI_(3) ZnO silicon heterojunction simulation

Aeroelastic Optimization of the High Aspect Ratio Wing with Aileron

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Computers, Materials & Continua 2022年第3期70卷 5569-5581页

作者： Mohammad Ghalandari Ibrahim Mahariq Farhad Ghadak oussama Accouche Fahd Jarad Department of Aerospace Engineering Sharif University of TechnologyTehran11155-8639Iran College of Engineering and Technology American University of theMiddle EastKuwait Faculty of Aerospace Engineering Engineering IHUTehranIran Department of Mathematics Cankaya UniversityEtimesgutAnkaraTurkey Department of Medical Research China Medical University HospitalChina Medical UniversityTaichungTaiwan

In aircraft wings,aileron mass parameter presents a tremendous effect on the velocity and frequency of the flutter *** that purpose,we present the optimization of a composite design wing with an aileron,using machine-learning *** properties and its distribution have a great influence on the multi-variate optimization procedure,based on speed and frequency of ***,flutter speed was obtained to estimate aileron *** mass-equilibrated and other features were *** can deduced that changing the position and mass properties of the aileron are tangible following the speed and frequency of the wing *** on the proposed optimization method,the best position of the aileron is determined for the composite wing to postpone flutter instability and decrease the existed *** represented coupled aero-structural model is emerged from subsonic aerodynamics model,which has been developed using the panel method in multidimensional *** structural modeling has been conducted by finite element method,using the p-k *** fluid-structure equations are solved and the results are extracted.

关键词： Flutter speed flutter frequency composite wing aileron multi-disciplinary optimization method

Coupling of Thermal-Hydraulic-Mechanical Processes for Geothermal Reservoir Modelling

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Journal of Earth Science 2015年第1期26卷 47-52页

作者： Ali Karrechl oussama Beltaief Ruyan Vincec Thomas Poulet Klaus Regenauer-Lieb School of Civil and Resource Engineering The University of Western AustraliaCrawley WA 6009Australia Tunisia Polytechnic School Rue AlkhawarizmiLa MarsaTunisia Earth Science and Resource Engineering CSIROKensington WA 6151Australia School of Petroleum Engineering University of New South WalesSydney NSW 2052Australia School of Earth and Environment The University of Western AustraliaPerth WA 6000Australia

This paper uses a fully coupled framework of thermal-hydraulic-mechanical processes to investigate how the injection and extraction of fluid within a geothermal reservoir impacts on the distributions of temperature, pore pressure, and deformation within the rock formations. Based on this formulation, a numerical model is developed in light of the thermodynamics of porous materials. The proposed procedure relies on the derivation of dissipative flow rules by postulating proper storage and dissipation functions. This approach opens new horizons for several resource engineering applications. Since it allows for full coupling, this formulation can play a key role in predicting risks when used for reservoir simulation. The results indicate that the injection-extraction process and temperature change have a definite impact on altering the in-situ properties of the reservoir.

关键词： poro-mechanics resource engineering fluid injection and extraction temperaturechange pore pressure stress deformation uplift subsidence.