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EJUSTCO:Monte Carlo radiation transport code hybrid with ANN model for gamma-ray shielding simulation

Nuclear Science and Techniques 2023年第9期34卷 155-176页

作者： Joseph Konadu Boahen Ahmed S.G.khalil Mohsen A.Hassan Samir A.Elsagheer Mohamed Materials Science and Engineering Department School of Innovative Design EngineeringEgypt-Japan University of Science and Technology(E-JUST)179New Borg El-Arab CityEgypt Physics Department Environmental and Smart Technology GroupFaculty of ScienceFayoum UniversityFayoum 63514Egypt Faculty of Engineering Aswan UniversityAswanEgypt

Gamma ray shielding is essential to ensure the safety of personnel and equipment in facilities and environments where radiation exists.The Monte Carlo technique is vital for analyzing the gamma-ray shielding capabilities of materials.In this study,a simple Monte Carlo code,EJUSTCO,is developed to cd simulate gamma radiation transport in shielding materials for academic purposes.The code considers the photoelectric effect,Compton(incoherent)scattering,pair production,and photon annihilation as the dominant interaction mechanisms in the gamma radiation shielding problem.Variance reduction techniques,such as the Russian roulette,survival weighting,and exponential transformation,are incorporated into the code to improve computational efficiency.Predicting the exponential transformation parameter typically requires trial and error as well as expertise.Herein,a deep learning neural network is proposed as a viable method for predicting this parameter for the first time.The model achieves an MSE of 0.00076752 and an R-value of 0.99998.The exposure buildup factors and radiation dose rates due to the passage of gamma radiation with different source energies and varying thicknesses of lead,water,iron,concrete,and aluminum in single-,double-,and triple-layer material systems are validated by comparing the results with those of MCNP,ESG,ANS-6.4.3,MCBLD,MONTEREY MARK(M),PENELOPE,and experiments.Average errors of 5.6%,2.75%,and 10%are achieved for the exposure buildup factor in single-,double-,and triple-layer materials,respectively.A significant parameter that is not considered in similar studies is the gamma ray albedo.In the EJUSTCO code,the total number and energy albedos have been computed.The results are compared with those of MCNP,FOTELP,and PENELOPE.In general,the EJUSTCO-developed code can be employed to assess the performance of radiation shielding materials because the validation results are consistent with theoretical,experimental,and literary results.

关键词： Monte Carlo Gamma rays Shielding Artificial neural network Simulation

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A Service Level Agreement Aware Online Algorithm for Virtual Machine Migration

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Computers, Materials & Continua 2023年第1期74卷 279-291页

作者： Iftikhar Ahmad Ambreen Shahnaz Muhammad Asfand-e-Yar Wajeeha khalil Yasmin Bano Department of Computer Science and Information Technology University of Engineering and TechnologyPeshawar25120Pakistan Department of Computer Science Shaheed Benazir Bhutto Women UniversityPeshawar25000Pakistan Center of Excellence in Artificial Intelligence Department of Computer ScienceBahria UniversityIslamabadPakistan

The demand for cloud computing has increased manifold in the recent past.More specifically,on-demand computing has seen a rapid rise as organizations rely mostly on cloud service providers for their day-to-day computing needs.The cloud service provider fulfills different user requirements using virtualization-where a single physical machine can host multiple VirtualMachines.Each virtualmachine potentially represents a different user environment such as operating system,programming environment,and applications.However,these cloud services use a large amount of electrical energy and produce greenhouse gases.To reduce the electricity cost and greenhouse gases,energy efficient algorithms must be designed.One specific area where energy efficient algorithms are required is virtual machine consolidation.With virtualmachine consolidation,the objective is to utilize the minimumpossible number of hosts to accommodate the required virtual machines,keeping in mind the service level agreement requirements.This research work formulates the virtual machine migration as an online problem and develops optimal offline and online algorithms for the single host virtual machine migration problem under a service level agreement constraint for an over-utilized host.The online algorithm is analyzed using a competitive analysis approach.In addition,an experimental analysis of the proposed algorithm on real-world data is conducted to showcase the improved performance of the proposed algorithm against the benchmark algorithms.Our proposed online algorithm consumed 25%less energy and performed 43%fewer migrations than the benchmark algorithms.

关键词： Cloud computing green computing online algorithms virtual machine migration

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Facial basal cell carcinoma:A retrospective study of 67 cases

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World Journal of Clinical Cases 2023年第7期11卷 1488-1497页

作者： Afrah A khalil Hamid H Enezei Tahrir N Aldelaimi Raid M Al-Ani Department of Oral Diagnosis College of DentistryUniversity of AnbarRamadi 31001AnbarIraq Department of Oral and Maxillofacial Surgery College of DentistryUniversity of AnbarRamadi 31001AnbarIraq Department of Surgery/Otolaryngology University of AnbarCollege of MedicineRamadi 31001AnbarIraq

BACKGROUND Basal cell carcinoma(BCC)is a slow-growing malignant tumor characterized by local invasiveness but an exceptionally rare metastatic potential.It ideally affects sun-exposed skin of older patients with more propensity for the facial region.AIM To evaluate the different clinicopathological characteristics of the facial BCC and the efficacy and safety of diode laser for the treatment of these lesions.METHODS We retrospectively reviewed facial BCC lesions of60 years(P value=0.007).Excellent aesthetic and functional outcomes were reported in all cases after 6 mo of follow-up.Few complications were reported after diode laser ablation.CONCLUSION Facial BCC was mostly seen in the elderly and men.The mean duration was 5.15 mo.The nose was the commonest involved site.Noduloulcerative lesions were seen in approximately half of the lesions.The age of the patients determined the histological type of the lesion(solid type was mostly seen in the age group≤60 years,while,adenoid in the age group>60 years).Diode laser ablation showed excellent functional and aesthetic outcomes following a 6-mo follow-up.

关键词： Basal cell carcinoma Maxillofacial pathology Histopathology Malignant skin tumors Dermatological lesions Diode laser

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Robust Stabilization of Non-minimum Phase Switched Nonlinear Systems with Uncertainty

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Journal of Systems Science & Complexity 2020年第2期33卷 289-311页

作者： khalil Jouili Laboratory of Advanced Systems Polytechnic School of Tunisia(EPT) B.P.7432078 MarsaTunisia

This paper investigates the problem of robust stabilization of a class of switched nonlinear system with uncertain dynamics where each subsystem represents a non-minimum phase.The authors first construct a stabilizing sliding mode controller for each subsystem to stabilize individually its own unstable internal dynamics.Then,a switching strategy is introduced to select the most appropriate diffeomorphism through an infinity of diffeomorphisms.Sufficient conditions are specifically given for the exponential stability and the exponential upper bound of the trajectory of the switched subsystem,which guarantees the global asymptotical stability of the resulting switched system.Obviously,the proposed control approach can improvemore the transient state,compared to a feedback linearization based on only one diffeomorphism.Simulation studies illustrate the effectiveness of the suggested approach.

关键词： Exponential stability sliding mode control switching control uncertain non-minimum phase systems

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A Facile Recovery Process for Cathodes from Spent Lithium Iron Phosphate Batteries by Using Oxalic Acid

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CSEE Journal of Power and Energy Systems 2018年第2期4卷 219-225页

作者： Li Li Jun Lu Longyu Zhai Xiaoxiao Zhang Larry Curtiss Yi Jin Feng Wu Renjie Chen khalil amine School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Chemical Sciences and Engineering Division Argonne National LaboratoryIL 60439USA Material Science Division Argonne National LaboratoryIL 60439USA State Key Laboratory of Operation and Control of Renewable Energy and Storage Systems China Electric Power Research Institute.Beijing 100192China

A simplistic and novel leaching process is developed to dispose spent lithium iron phosphate(LiFePO_(4))batteries.In this paper,oxalic acid is selected as a leaching reagent to recover lithium as a resource and remove phosphorus from LiFePO_(4) batteries,benefiting from its low natural effects.The physical properties of spent cathode materials(before leaching)and residues(after leaching)are identified by X-ray diffraction(XRD)and scanning electronic microscopy(SEM)with energy dispersive X-ray spectroscopy(EDS).The total amounts of Li and Fe are analyzed by inductively coupled plasma-atomic emission spectroscopy(ICP-AES).The process occurs under conditions of a 0.3 mol·L^(-1) oxalic acid concentration,a temperature of 80℃,a reaction time of 60 min and a solid/liquid ratio of 60 g·L^(-1).It can effectively precipitate92%ferrum in terms of FeC_(2)O_(4)·2H_(2)O from LiFePO4,with the leaching efficiency of Li achieving up to 98%.This method demonstrates a new strategy for dealing with spent lithium iron phosphate batteries with a low cost and low environmental impact.

关键词： Leaching oxalic acid precipitation spent lithium-ion batteries

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A Three-Dimensional Real-Time Gait-Based Age Detection System Using Machine Learning

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Computers, Materials & Continua 2023年第4期75卷 165-182页

作者： Muhammad Azhar Sehat Ullah khalil Ullah Habib Shah Abdallah Namoun Khaliq Ur Rahman Department of Computer Science&IT University of MalakandChakdara18800Pakistan Department of Software Engineering University of MalakandChakdara18800Pakistan College of Computer Science King Khalid UniversityAbha62529Saudi Arabia Faculty of Computer and Information Systems Islamic University of MadinahMadinah42351Saudi Arabia Department of Statistics Abdul Wali Khan UniversityMardan23200Pakistan

Human biometric analysis has gotten much attention due to itswidespread use in different research areas, such as security, surveillance,health, human identification, and classification. Human gait is one of the keyhuman traits that can identify and classify humans based on their age, gender,and ethnicity. Different approaches have been proposed for the estimation ofhuman age based on gait so far. However, challenges are there, for which anefficient, low-cost technique or algorithm is needed. In this paper, we proposea three-dimensional real-time gait-based age detection system using a machinelearning approach. The proposed system consists of training and testingphases. The proposed training phase consists of gait features extraction usingthe Microsoft Kinect (MS Kinect) controller, dataset generation based onjoints’ position, pre-processing of gait features, feature selection by calculatingthe Standard error and Standard deviation of the arithmetic mean and bestmodel selection using R2 and adjusted R2 techniques. T-test and ANOVAtechniques show that nine joints (right shoulder, right elbow, right hand, leftknee, right knee, right ankle, left ankle, left, and right foot) are statisticallysignificant at a 5% level of significance for age estimation. The proposedtesting phase correctly predicts the age of a walking person using the resultsobtained from the training phase. The proposed approach is evaluated on thedata that is experimentally recorded from the user in a real-time scenario.Fifty (50) volunteers of different ages participated in the experimental study.Using the limited features, the proposed method estimates the age with 98.0%accuracy on experimental images acquired in real-time via a classical generallinear regression model.

关键词： Age estimation gait biometrics classical linear regression model

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Total Syntheses of Favolasins A,E,G and K,Polyketides Isolated from Cultures of the Basidiomycetes Fungi Favolaschia sp.BCC 18686 and Favolaschia calocera BCC 36684

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Chinese Journal of Chemistry 2023年第12期41卷 1450-1464页

作者： Bingbing Sheng Ping Lan Jolynn Kiong Zeinab G. khalil Robert J. Capon Martin G.Banwell Institute for Advanced and Applied Chemical Synthesis College of Pharmacy Jinan University Guangzhou Guangdong 510632 China Guangdong Province Key Laboratory of Pharmacodynamic Constituents of TCM & New Drugs Research Jinan University Guangzhou Guangdong 510632 China Institute for Molecular Bioscience The University of Queensland St Lucia QLD 4072 Australia Guangdong Key Laboratory for Research and the Development of Natural Drugs The Marine Biomedical Research Institute Guangdong Medical University Zhanjiang Guangdong 524023 China

The structures assigned to all four members,1-4,of the recently reported favolasin class of natural product have been prepared for the first time by chemical synthesis.Suzuki-Miyaura cross-coupling chemistry was used to establish the associated biaryl substructures.The key step used in preparing the 1,5-benzodioxepin ring system associated with compounds 3 and 4 was the acid-catalyzed 7-exo-tet cyclization of an appropriately substituted 2-(oxiran-2-ylmethoxy)phenol while a base-promoted 6-exo-tet cyclization of the same substrate was used to construct the 2,3-dihydrobenzo[b][1,4]dioxine core of target 2.The spectral data derived from the four synthetically-produced favolasins matched those reported for the corresponding natural products.Preliminary biological screening of compounds 1-3 as well as a suite of fourteen precursors reveal that they display no notable anti-bacterial,anti-fungal or anti-tumor activities but congener K(4)is active,in the mM range,against Plasmodium falciparum.

关键词： Total syntheses Favolasins Suzuki-Miyaura cross-coupling Acetalization Anti-malarial

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High-density single antibody electrochemical nanoarrays

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Nano Research 2023年第4期16卷 5412-5418页

作者： khalil Chennit Yannick Coffinier Shuo Li Nicolas Clément Agnès Anne Arnaud Chovin Christophe Demaille UniversitéParis Cité CNRSLaboratoire d’Electrochimie MoléculaireParis F-75013France Institute of Electronics Microelectronics and NanotechnologyCNRSUniversity of LilleAvenue PoincaréBP60069Villeneuve d’Ascq 59652France IIS LIMMS/CNRS-IIS UMI2820The University of Tokyo4-6-1 KomabaMeguro-kuTokyo 153-8505Japan

The fabrication and electrochemical interrogation of very high density single-antibody nanoarrays is reported.Gold nanodots,15 nm in diameter,arranged in large(cm2)square arrays with a pitch of 200 nm,are used as carriers for primary antibodies(immunoglobulin G(IgG)),further recognized by secondary redox-labeled detection antibodies.Ensemble scale interrogation of the antibody array by cyclic voltammetry,and nanoscale interrogation of individual nanodots by mediator tethered atomic forcescanning electrochemical microscopy(Mt/AFM-SECM),enable the occupancy of nanodots by single antibody molecules to be demonstrated.Experiments involving the competitive adsorption of antibodies of different species onto the nanodots evidence the possibility of using single-antibody nanoarrays for digital electrochemical immunoassays.

关键词： single entity electrochemistry electrochemical digital immunoassays atomic force-scanning electrochemical microscopy(AFM-SECM)

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Uniformly dispersed FeOx atomic clusters by pulsed arc plasma deposition： An efficient electrocatalyst for improving the performance of Li-O2 battery

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Nano Research 2016年第7期9卷 1913-1920页

作者： Xiangyi Luo Jun Lu Evan Sohm Lu Ma Tianpin Wu Jianguo Wen Dantong Qiu YunKai Xu Yang Ren Dean J. Miller khalil amine Material Sciences Division Argonne National Laboratory Argonne IL 60439 USA Chemical Sciences and Engineering Division Argonne National Laboratory Argonne IL 60439 USA ULVAC Technologies Inc. Methuen MA 01844 USA Center for N anoscale Materials Nanoscience and Technology Argonne National Laboratory Argonne IL 60439 USA Advanced Photon Source Argonne National Laboratory Argonne IL 60439 USA Center for Nanoscale Materials Nanoscience and Technology Argonne Notional Laboratory Argonne IL 60439 USA

The present study explored a new method to improve the catalytic activity of non-precious metals, especially in electrochemical reactions. Highly ionized Fe plasma produced by arc discharge was uniformly deposited on a porous carbon substrate and formed atomic clusters on the carbon surface. The as-prepared FeO~/C material was tested as a cathode material in a rechargeable Li-02 battery under different current rates. The results showed significant improvement in battery performance in terms of both cycle life and reaction rate. Furthermore, X-ray diffraction （XRD） and scanning electron microscopy （SEM） results showed that the as-prepared cathode material stabilized the cathode and reduced side reactions and that the current rate was a critical factor in the nucleation of the discharge products.

关键词： Li-O2 battery,FeOx atomic cluster,electrocatalyst,pulsed arc plasmadeposition （APD）

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Mechanical wet-milling and subsequent consolidation of ultra-fine Al_2O_3-(ZrO_2+3%Y_2O_3) bioceramics by using high-frequency induction heat sintering

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中国有色金属学会会刊：英文版 2007年第1期17卷 21-26页

作者： khalil Abdelrazek khalil Sug Won KIM Division of Advanced Materials Engineering RIAMD Chonbuk National University

Alumina/zirconia composites were synthesized by wet-milling technique and rapid consolidation with high frequency induction heat sintering(HFIHS). The starting materials were a mixture of alumina micro-powder (80%, volume fraction) and 3YSZ nano-powders (20%). The mixtures were optimized for good sintering behaviors and mechanical properties. Nano-crystalline grains are obtained after 24 h milling. The nano-structured powder compacts are then processed to full density at different temperatures by HFIHS. Effects of temperature on the mechanical and microstructure properties were studied. Al2O3-3YSZ composites with higher mechanical properties and small grain size are successfully developed at relatively low temperatures through this technique.

关键词：生物陶瓷烧结工艺高频诱导微观结构机械性能

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