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Effect of vertical stress rest period on deformation behaviour of unbound granular materials:Experimental and numerical investigations

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Journal of Rock Mechanics and Geotechnical Engineering 2019年第1期11卷 172-180页

作者： ali alnedawi Kali Prasad Nepal Riyadh al-Ameri Mohanad alabdullah School of Engineering Deakin University

Repeated load triaxial test is used to assess the deformation behaviour of unbound granular materials(UGMs) in flexible road pavements. Repeated load pulse characteristics(i.e. shape, loading period and rest period) are the stress configurations used in the experimental set-up to simulate the passing axle loads. Some researchers and standard testing protocols suggest a rest period of varying durations after a loading phase. A thorough review of existing literature and practises has revealed that there is no agreement about the effect of the rest period of vertical stress pulse on the deformation behaviour of the UGMs. Therefore,the main objective of this study is to investigate the effect of repeated stress rest period on the deformation behaviour of UGMs experimentally. Experiments are conducted, both with and without rest period, using basalt and granite crushed rocks from Victoria, Australia. Furthermore, in order to gain insight into the effect of the rest period, finite element modelling is also developed. Both the experimental and modelling results show that the rest period has a noticeable effect on both resilient and permanent deformation behaviours of UGMs. It is, therefore, recommended to take extra precautions while adopting a particular standard testing protocol and to supplement the results by additional tests with different loading configurations.

关键词： Flexible pavement Unbound granular materials(UGMs) Repeated load triaxial test Resilient modulus Permanent deformation Finite element modelling

Online Fuzzy Logic Base algorithm for Electricity Price Prediction

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Journal of Electronic Science and Technology 2017年第4期15卷 371-376页

作者： Moamin J.albayed A.R.al-ali Mostafa Shaaban Computer Science and Engineering Department American University of Sharjah Sharjah 2666 UAE Electrical Engineering Department American University of Sharjah Sharjah 2666 UAE

This paper presents a web-based system to predict the electricity *** proposed system captures the geographical location,weather forecast,and oil price for one week *** captured parameters are fed to a fuzzy-logic-based algorithm to calculate electric energy *** on predicted electricity prices,consumers can turn ON/OFF or reschedule operations of their home appliances to reduce their electricity *** proposed algorithm was developed and hosted in a utility server(U-server).On the consumer side,a home gateway(H-gateway),and a monitoring and control system was designed,built,and tested by using a single chip microcontroller.

关键词： Electricity tariff fuzzy logic home automation smart energy

Immunized camels and COVID-19

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Asian Pacific Journal of Tropical Medicine 2020年第6期13卷 239-241页

作者： Sidgi S.Hasson ali A.al-Jabri Department of Microbiology and Immunology College of Medicine&Health SciencesSultan Qaboos UniversityMuscatOman

The World Health Organization(WHO)declared coronavirus disease-2019(COVID-19),a global pandemic on 11 th March 2020,as its causative virus"severe acute respiratory syndrome coronavirus-2"(SARS-Co V-2)spreads rapidly o... 详细信息

关键词： acute respiratory COV

WebFLex:A Framework for Web Browsers-Based Peer-to-Peer Federated Learning Systems Using WebRTC

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Computers, Materials & Continua 2024年第3期78卷 4177-4204页

作者： Mai alzamel Hamza ali Rizvi Najwa altwaijry Isra al-Turaiki Department of Computer Science College of Computer and Information SciencesKing Saud UniversityRiyadhKingdom of Saudi Arabia Department of Computer Science and Engineering Punjab Engineering CollegeChandigarhIndia

Scalability and information personal privacy are vital for training and deploying large-scale deep learning *** learning trains models on exclusive information by aggregating weights from various devices and taking advantage of the device-agnostic environment of web ***,relying on a main central server for internet browser-based federated systems can prohibit scalability and interfere with the training process as a result of growing client ***,information relating to the training dataset can possibly be extracted from the distributed weights,potentially reducing the privacy of the local data used for *** this research paper,we aim to investigate the challenges of scalability and data privacy to increase the efficiency of distributed training *** a result,we propose a web-federated learning exchange(WebFLex)framework,which intends to improve the decentralization of the federated learning *** is additionally developed to secure distributed and scalable federated learning systems that operate in web browsers across heterogeneous ***,WebFLex utilizes peer-to-peer interactions and secure weight exchanges utilizing browser-to-browser web real-time communication(WebRTC),efficiently preventing the need for a main central *** has actually been measured in various setups using the MNIST *** results show WebFLex’s ability to improve the scalability of federated learning systems,allowing a smooth increase in the number of participating devices without central data *** addition,WebFLex can maintain a durable federated learning procedure even when faced with device disconnections and network ***,it improves data privacy by utilizing artificial noise,which accomplishes an appropriate balance between accuracy and privacy preservation.

关键词： Federated learning web browser privacy deep learning

Multidrug resistance Acinetobacter species at the intensive care unit,Aseer Central Hospital,Saudi Arabia:A one year analysis

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Asian Pacific Journal of Tropical Medicine 2016年第9期9卷 881-885页

作者： ali al Bshabshe Martin R.P.Joseph ali al Hussein Waleed Haimour Mohamed E.Hamid Department of Medicine College of MedicineKing Khalid University Department of Microbiology College of MedicineKing Khalid University Intensive Care Unit Aseer Central Hospital Microbiology Laboratories Aseer Central Hospital

Objective:To identify and to determine the antimicrobial susceptibility of Acinetobacter baumannii(***) clinical isolates from ICU at Aseer Central ***:The study was conducted in the Intensive Care Unit,Aseer Central Hospital,Saudi Arabia over 13 months period(2014-2015).Acinetobacter species(n= 105) were isolated from various clinical *** were identified using selected phenotypic criteria and confirmed using the Vitek 2 automated *** system was used to determine the susceptibilities of 21 antimicrobial ***,isolates and drug data were analyzed using the SPSS statistical software package to determine some epidemiological and microbiological ***:Of the 105 stains,*** accounted for 49(46.67%),*** complex,19(18.09%),***/haemolyticus 32(30.47),Acinetobacter haemolyticus 4(3.81%),Acinetobater lwoffii 1(0.95%) and unidentified Acinetobater species 2(1.3%).Of the 105 Acinetobacter strains,103(98.1%) were found multidrug resistant(MDR).*** strain were 100% sensitive to colistin and 74.5% to trimethoprim + *** remaining 19 antimicrobial agents revealed low or no sensitivities:amikacin 16.3%; ampicillin 7.7%; ceftazidime 7.3%.Distribution of similar sensitivities was shown by other Acinetobacter *** number of isolates from males and females indicates no statistical variation(P=0.867) whereas age groups showed significant differences(P= 0.008) as it is clear from the high percentage of infected individuals more than 60 years followed by those aged 20 to 29 years old(19.05%).Upper respiratory tract(30.48%),lower respiratory tract(47.65%) and subcutaneous tissue(9.5%) were the main sources of Acinetobacter *** mean numbers of isolates from these specimens indicate no discrepancy between specimens(P=0.731).Conclusions:Acinetobacterspecies including *** were found MDR(98.1%) according to the current Acinetobacter *** categorization.A

关键词： Acinetobacter spp. ICU Antimicrobials Aseer Central Hospital

Communication-less Management Strategy for Electric Vehicle Charging in Droop-controlled Islanded Microgrids

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Journal of Modern Power Systems and Clean Energy 2024年第4期12卷 1227-1238页

作者： Abdullah Azhar al-Obaidi Mohammed Zaki El-Sharafy Hany E.Z.Farag Saifullah Shafiq ali al-Awami Independent Electricity System Operator(IESO) MississaugaCanada Department of Electrical Engineering and Computer Science York UniversityTorontoCanada University of Queensland StLucia QLD 4067Australia Department of Electrical Engineering King Fahd University of Petroleum&MineralsDhahranSaudi Arabia

Adopting high penetration levels of electric vehicles(EVs) necessitates the implementation of appropriate charging management systems to mitigate their negative impacts on power distribution networks. Currently, most of the proposed EV charging management techniques rely on the availability of high-bandwidth communication links. Such techniques are far from realization due to(1) the lack of utility-grade communication systems in many cases such as secondary(low-voltage) power distribution systems to which EVs are connected, rural areas, remote communities, and islands, and(2) existing fears and concerns about the data privacy of EV users and cyber-physical security. For these cases, appropriate local control schemes are needed to ensure the adequate management of EV charging without violating the grid operation requirements. Accordingly, this paper introduces a new communication-less management strategy for EV charging in droop-controlled islanded microgrids. The proposed strategy is autonomous, as it is based on the measurement of system frequency and local bus voltages. The proposed strategy implements a social charging fairness policy during periods when the microgrid distributed generators(DGs) are in short supply by allocating more system capacity to the EVs with less charging in the past. Furthermore, a novel communication-less EV load shedding scheme is incorporated into the management strategy to provide relief to the microgrid during events of severe undervoltage or underfrequency occurrences due to factors such as high loading or DG outages. Numerical simulations demonstrate the superiority of the proposed strategy over the state-of-the-art controllers in modulating the EV charging demand to counteract microgrid instability.

关键词： Charging battery management communication-less control droop control electric vehicle islanded microgrid

Experimental and numerical study of effecting core configurations on the static and dynamic behavior of honeycomb plate with aluminum material

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Defence Technology（防务技术） 2024年第9期39卷 177-192页

作者： Nehad Abid allah Hamza Fatima Mohammed K.al-Fatlwe Muna ali Talib Engineering College Al-Qasim Green University51013BabylonIraq Engineering Technical College of al-Najaf Al-Furat Al-Awsat Technical University(ATU)Najaf54003Iraq

The sandwich panel incorporated a honeycomb core,a widely utilized composite structure recognized as a fundamental classification of composite *** a core resembling a honeycomb,possessing thickness and softness,and is flank by rigid face sheets that sandwich various shapes and *** paper presents an examination of the static and dynamic analysis of lightweight plates made of aluminum honeycomb sandwich *** sandwich plate samples are 300 mm long,and 300 mm wide,the heights of the core have been varied at four values ranging from 10 to 25 *** honeycomb core is manufactured from aluminum material by using a novel technique namely resistance spot welding(RSW)instead of using adhesive material,which is often used when an industrial flaw is *** optimization based on response surface methodology(RSM)and design of experiment software(DOE)was used to verify the current work.A theoretical examination of the crashworthiness behavior(maximum bending load,maximum deflection)and vibration attributes(natural frequency,damping ratio,transient temporal response)of honeycomb sandwich panels with different design parameters was also carried *** addition,the finite element method-based ANSYS software was used to confirm the theoretical *** findings of the present work showed that the relationship between the natural frequency,core height,and cell size is *** contrast,the relationship between the natural frequency and the thickness of the cell wall is ***,the damping ratio is inversely proportional to the core height and cell size but directly proportional to the thickness of the cell *** study indicates that altering the core height within 10-25 mm leads to a significant increase of 82%in the natural frequency and a notable decrease of 49%in the damping *** findings are based on a specific cell size value of 0.01 m and a cell wall thickness of 0.001 ***,the results indicate

关键词： Honeycomb Load Transient response Free vibration Natural frequency

Tubular Heat Enhancement Using Twisted Tape Inserts with Large Holes

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Energy Engineering 2024年第2期121卷 273-290页

作者： ali Jaber Abdulhamed Aws al-Akam Wisam J.Khudhayer ali Sabri allw Faculty of Engineering-al-Mussayib University of BabylonHillaBabylon15001Iraq

Heat augmentation techniques play a vital role in the heating and cooling processes in industries,including solar collectors and many applications that utilize heat *** studies are based on inserting fillers inside the tubes to enhance heat *** investigation considered the effects of twisted tapes with large holes on a tubular heat exchanger’s(HX)heat transmission,pressure drop,and thermal boosting *** the experimental section,counter-swirl flow generators used twisted tapes with pairs of 1.0 cm-diameter holes and changes in porosity(Rp)at 1.30%and 2.70%.In the experiments,air was utilized as a working fluid in a tube with a circular *** turbulent flow was considered,with Reynolds numbers(Re)domain from 4800 to 9500,and a boundary condition with a uniform wall heat flux was *** findings expound that when the number of holes rose,the Nusselt number(Nu),the factor of friction(f),and the thermal enhancement factor(η)all increased as ***,as the friction factor increased,the Nusselt number of the tape-equipped tube was noticeably ***,it was discovered that the friction factor was between 70%and 94%lower than the values of the tube without tape,while the(Nu)was between 87%and 97%higher than the conventional tube *** maximum value ofηis 89%.According to the experimental results,empirical correlations for Nu,f,andηwere also generated.

关键词： Tubular heat exchanger tape inserts twisted tape

Distinctive clinical and laboratory features of COVID-19 and H1N1 influenza infections among hospitalized pediatric patients

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World Journal of Pediatrics 2021年第3期17卷 272-279页

作者： ali alsuheel Asseri Ayed A.Shati Saleh M.al-Qahtani Ibrahim A.alzaydani Ahmed A.al-Jarie Mohammed J.alaliani Abdelwahid Saeed ali Department of Child Health College of MedicineKing Khalid UniversityAbhaSaudi Arabia Department of Pediatrics Abha Maternity and Children HospitalAbhaSaudi Arabia General Directorate of Health Affairs Infection Prevention and Control AdministrationAseer RegionMinistry of HealthAbhaSaudi Arabia Department of Microbiology and Clinical Parasitology College of MedicineKing Khalid UniversityAbhaSaudi Arabia

Background It had been documented in many studies that pediatric coronavirus disease 2019(COVID-19)is characterized by low infectivity rates,low mortalities,and benign disease *** the other hand,influenza type A viruses are recognized to cause severe and fatal infections in children populations *** study is aimed to compare the clinical and laboratory characteristics of COVID-19 and H1N1 influenza *** A retrospective study comprising 107 children hospitalized at Abha Maternity and Children Hospital,Southern region of Saudi Arabia,with laboratory-confirmed COVID-19 and H1N1 influenza infections was carried out.A complete follow-up for all patients from the hospital admission until discharge or death was *** clinical data and laboratory parameters for these patients were collected from the medical records of the *** Out of the total enrolled patients,73(68.2%)were diagnosed with COVID-19,and 34(31.8%)were diagnosed with H1N1 *** median age is 12 months for COVID-19 patients and 36 months for influenza patients.A relatively higher number of patients with influenza had a fever and respiratory symptoms than COVID-19 *** contrast,gastrointestinal symptoms were observed in a higher number of COVID-19 patients than in influenza patients.A statistically significant increase in white cell counts is noted in COVID-19 but not in influenza patients(Palization between COVID-19 and influenza ***,the total intensive care unit length of stay was longer for influenza compared to COVID-19 *** A considerable number of children infected with COVID-19 and H1N1 influenza were noted and reported in this *** were no significant variations in the severity of the symptomatology and laboratory findings between the two groups of *** differences between these patients in some hospitalization facto

关键词： Children Coronavirus disease 2019 H1N1 influenza.Laboratory indices Symptoms