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Experimental Evaluation of Medium-Voltage Cascode Gallium Nitride(GaN)Devices for Bidirectional DC-DC Converters

CES Transactions on Electrical Machines and Systems 2021年第3期5卷 232-248页

作者： Salah S.alharbi Mohammad Matin Electrical Engineering in the School of Engineering at Albaha University Alaqiqin Saudi Arabia Electrical and Computer Engineering in the School of Engineering and Computer Science at University of Denver DenverCOin USA

Wide bandgap(WBG)semiconductors,such as silicon carbide(SiC)and gallium nitride(GaN),exhibit superior physical properties and demonstrate great potential for replacing conventional silicon(Si)semiconductors with WBG technology,pushing the boundaries of power devices to handle higher blocking voltages,switching frequencies,output power levels,and operating ***,tradeoffs in switching performance and converter efficiency when substituting GaN devices for Si and SiC counterparts are not well-defined,especially in a cascode *** research with further detailed investigation and analysis is necessitated for medium-voltage GaN devices in power converter ***,the aim of this research is to experimentally investigate the impact of emerging 650/900 V cascode GaN devices on bidirectional dc-dc converters that are suitable for energy storage and distributed renewable energy *** characteristics of Si,SiC,and cascode GaN power devices are examined through the double-pulse test(DPT)circuit at different gate resistance values,device currents,and DC bus ***,the switching behavior and energy loss as well as the rate of voltage and current changes over the time are studied and analyzed at various operating conditions.A 500 W experimental converter prototype is implemented to validate the benefits of cascode GaN devices on the converter operation and *** analysis of the power losses and efficiency improvements for Si-based,SiC-based,and GaN-based converters are performed and evaluated as the switching frequency,working temperature,and output power level are *** experimental results reveal significant improvements in switching performance and energy efficiency from the emerging cascode GaN devices in the bidirectional converters.

关键词： Bidirectional dc-dc converters cascode GaN-FETs double-pulse test energy efficiency power loss analysis SiC-MOSFET SiC-Schottky diode switching characterization

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Transferring architectural management into practice： A taxonomy framework

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Frontiers of Architectural Research 2015年第3期4卷 237-247页

作者： Mohammed alharbi Stephen Emmitt Peter Demian Architectural Engineering Department Taibah University 344 Medina 41411 Saudi Arabia Department of Architecture and Civil Engineering University of Bath Bath BA2 7AY United Kingdom School of Civil and Building Engineering Loughborough University Loughborough LE11 3TU United Kingdom

This research aimed to develop a unique framework to help architects understand and apply architectural management （AM） in their practices. A comprehensive literature review identified several components belonging to different specialist fields. A pragmatic methodology for developing the framework was adopted by combining the methodology of Japareen for building conceptual frameworks with the Concept Mapping and Qualitative Met-Synthesis techniques. The resulting framework underwent a series of testing stages aimed at refining the framework further. The testing process targeted two groups （researchers and professionals） by adopting a mixed method approach, which included a facilitated workshop, interviews, and a questionnaire survey. The feedback from the testing phase was used to create the final AM Taxonomy Framework （AMTF）, and served as an original and practical guide for practitioners, further extending their understanding of AM. Further validation and refinement are planned in the long term by applying the framework to selected architectural practices.

关键词： Architectural management Architectural practice Framework desisn Taxonomy

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Analytical and Numerical Investigation for the DMBBM Equation

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Computer Modeling in Engineering & Sciences 2020年第2期122卷 743-756页

作者： Abdulghani alharbi Mahmoud A.E.Abdelrahman M.B.Almatrafi Department of Mathematics College of ScienceTaibah UniversityAl-Madinah Al-MunawarahSaudi Arabia. Department of Mathematics Faculty of ScienceMansoura UniversityMansouraEgypt.

The nonlinear dispersive modified Benjamin-Bona-Mahony(DMBBM)equation is solved numerically using adaptive moving mesh PDEs(MMPDEs)***,the exact solution of the DMBBM equation is obtained by using the extended Jacobian elliptic function expansion *** current methods give a wider applicability for handling nonlinear wave equations in engineering and mathematical *** adaptive moving mesh method is compared with exact solution by numerical examples,where the explicit solutions are *** numerical results verify the accuracy of the proposed method.

关键词： DMBBM equation Jacobian elliptic functions moving mesh PDEs(MMPDEs) moving adaptive scheme solitary waves.

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A New Method to Evaluate Linear Programming Problem in Bipolar Single-Valued Neutrosophic Environment

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Computer Modeling in Engineering & Sciences 2021年第11期129卷 881-906页

作者： Jamil Ahmed Majed G.alharbi Muhammad Akram Shahida Bashir Department of Mathematics University of GujratGujratPakistan Department of Mathematics College of Arts and SciencesMethnabQassim UniversityBuraydahSaudi Arabia Department of Mathematics University of the PunjabNew CampusLahorePakistan

A bipolar single-valued neutrosophic set can deal with the hesitation relevant to the information of any decision making problem in real life scenarios,where bipolar fuzzy sets may fail to handle those hesitation *** this study,we first develop a new method for solving linear programming problems based on bipolar singlevalued neutrosophic ***,we apply the score function to transform bipolar single-valued neutrosophic problems into crisp linear programming ***,we apply the proposed technique to solve fully bipolar single-valued neutrosophic linear programming problems with non-negative triangular bipolar single-valued neutrosophic numbers(TBSvNNs)and non-negative trapezoidal bipolar single-valued neutrosophic numbers(TrBSvNNs).

关键词： Bipolar single-valued neutrosophic numbers score function trapezoidal numbers linear programming

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Performance Enhancement of Praseodymium Doped Fiber Amplifiers

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Computers, Materials & Continua 2022年第12期73卷 5411-5422页

作者： Abdullah G.alharbi Jawad Mirza Mehak Raza Salman Ghafoor Department of Electrical Engineering Faculty of EngineeringJouf UniversitySakaka42421Saudi Arabia SEECS Photonics Research Group Islamabad44000Pakistan Institute of Space Technology Islamabad44000Pakistan School of Electrical Engineering and Computer Science(SEECS) National University of Sciences and Technology(NUST)Islamabad44000Pakistan

In this paper,we report a simulation study on the performance enhancement of Praseodymium doped silica fiber amplifiers(PDFAs)in O-band(1270-1350 nm)in terms of small signal gain,power conversion efficiency(PCE),and output optical power by employing bidirectional *** PDFA performance is examined by optimizing the length of Praseodymium doped silica fiber(PDF),its mode-field diameter(MFD)and the concentration of Pr^(3+).A small-signal peak gain of 56.4 dB,power conversion efficiency(PCE)of 47%,and output optical power of around 1.6 W(32 dBm)is observed at optimized parameters for input signal wavelength of 1310 *** noise figure(NF)of 4.1 dB is observed at input signal wavelength of 1310 ***,the effect of varying the pump wavelength and pump power on output optical power of the amplifier and amplified spontaneous emission(ASE)noise is also investigated,***,the impact of ion-ion interaction(up-conversion effect)on small-signal gain of the amplifier is also studied by considering different values of up-conversion coefficient.

关键词： Praseodymium-doped fiber doped fiber amplifiers optical amplification mode field diameter noise figure

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Use of testicular sperm in couples with SCSA-defined high sperm DNA fragmentation and failed intracytoplasmic sperm injection using ejaculated sperm

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Asian Journal of Andrology 2020年第4期22卷 348-353页

作者： Mohannad alharbi Fadl Hamouche Simon Phillips Jacques Isaac Kadoch Armand Zini Division of Urology Department of SurgeryMcGill UniversityMontreal H4A3J1Canada Department of Urology College of MedicineQassim UniversityQassim 1162Saudi Arabia OVO Fertility Clinic Montreal H4P2S4Canada Department of Obstetrics and Gynecology University of MontrealMontreal H3C3J7Canada

Sperm DNA fragmentation(SDF)has been linked with male infertility,and previous studies suggest that SDF can have negative influence on pregnancy outcomes with assisted *** performed a retrospective review of consecutive couples with a high SDF level that had intracytoplasmic sperm injection(ICSI)using testicular sperm(T-ICSI).We compared the T-ICSI outcomes to that of two control groups:87 couples with failed first ICSI cycle and who had a second ICSI cycle using ejaculated sperm(Ej-ICSI),and 48 consecutive couples with high sperm chromatin structure assay(SCSA)-defined SDF(>15%)that underwent an ICSI cycle using ejaculated sperm after one or more failed ICSI cycles(Ej-ICSI-high SDF).The mean number of oocytes that were retrieved and the total number of embryos were not different among the three *** mean number of transferred embryos in the T-ICSI group was higher than the Ej-ICSI group but not significantly different than the Ej-ICSI-high SDF group(1.4,1.2,and 1.3,respectively,P0.05).No significant difference was found in live birth rate when comparing T-ICSI to Ej-ICSI and Ej-ICSI-high SDF *** results suggest that pregnancy outcomes and live birth rates with T-ICSI are not significantly superior to Ej-ICSI in patients with an elevated SCSA-defined sperm DNA fragmentation and prior ICSI failure(s).

关键词： intracytoplasmic sperm injection male infertility sperm chromatin structure assay sperm DNA fragmentation sperm retrieval testicular sperm

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Performance Analysis of Multi-Channel CR Enabled IoT Network with Better Energy Harvesting

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Computers, Materials & Continua 2022年第4期71卷 183-197页

作者： Afiya Kiran Ahmad Karim Yasser Obaid alharbi Diaa Mohammed Uliyan Department of Computer Science BZ UniversityMultan6000Pakistan Department of Information Technology BZ UniversityMultanPakistan College of Computer Science and Engineering University of Ha’ilHailSaudi Arabia

Wireless Sensor Networks(WSNs)can be termed as an autoconfigured and infrastructure-less wireless networks to monitor physical or environmental conditions,such as temperature,sound,vibration,pressure and motion *** may comprise thousands of Internet of Things(IoT)devices to sense and collect data from its surrounding,process the data and take an automated and mechanized *** the other side the proliferation of these devices will soon cause radio spectrum ***,to facilitate these networks,we integrate Cognitive Radio(CR)functionality in these *** can sense the unutilized spectrum of licensed users and then use these empty bands when *** order to keep the IoT nodes functional all time,continuous energy is *** this reason the energy harvested techniques are preferred in IoT *** it is preferred to harvest Radio Frequency(RF)energy in the *** this paper a region based multi-channel architecture is *** which the coverage area of primary node is divided as Energy Harvesting Region and Communication *** Secondary User(SU)that are the licensed user is IoT enabled with Cognitive Radio(CR)techniques so we call it CR-enabled IoT node/device and is encouraged to harvest energy by utilizing radio frequency *** harvest energy efficiently and to reduce the energy consumption during sensing,the concept of overlapping region is given that supports to sense multiple channels simultaneously and help the SU to find best channel for transmitting data or to harvest energy from the ideal *** the experimental analysis,it is proved that SU can harvest more energy in overlapping region and this architecture proves to consume less energy during data transmission as compared to single *** also show that channel load can be highly reduced and channel utilization is proved to be more ***,this proves the proposed architecture cost-effective and energy-efficient.

关键词： Wireless sensor network multi-channel sensing energy harvesting cognitive radio IoT network

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YOLO and Blockchain Technology Applied to Intelligent Transportation License Plate Character Recognition for Security

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Computers, Materials & Continua 2023年第12期77卷 3697-3722页

作者： Fares alharbi Reem Alshahrani Mohammed Zakariah Amjad Aldweesh Abdulrahman Abdullah Alghamdi Department of Computer Science College of Computing and ITShaqra UniversityShaqra15526Saudi Arabia Department of Computer Science College of Computers and ITTaif UniversityP.O.Box 11099Taif21944Saudi Arabia College of Computer and Information Science King Saud UniversityRiyadhSaudi Arabia

Privacy and trust are significant issues in intelligent transportation systems(ITS).Data security is critical in ITS systems since sensitive user data is communicated to another user over the internet through wireless devices and routes such as radio channels,optical fiber,and blockchain *** Internet of Things(IoT)is a network of connected,interconnected *** issues occasionally arise due to the amount of data ***,they have been primarily addressed by blockchain and smart contract *** there are still security issues with smart contracts,primarily due to the complexity of writing the code,there are still many challenges to consider when designing blockchain designs for the IoT *** study uses traditional blockchain technology with the“You Only Look Once”(YOLO)object detection method to accurately locate and identify license *** YOLO and blockchain technologies used for intelligent vehicle license plate recognition are promising,they have received limited research ***-time object identification and recognition would be possible by combining a cutting-edge object detection technique with a regional convolutional neural network(RCNN)built with the tensor flow core open source *** method works reasonably well for identifying any license *** Automatic License Plate Recognition(ALPR)approach delivered outstanding results in various ***,with a recognition rate of 96.2%,our system(UFPR-ALPR)surpassed the previously used technology,consisting of 4500 frames and around 150 ***,a deep learning algorithm was trained to recognize images of license plate numbers using the UFPR-ALPR ***,the license plate’s characters were complicated for standard methods to identify because of the shifting lighting *** proposed model,however,produced beneficial outcomes.

关键词： Intelligent transportation system blockchain technology license plate recognition privacy YOLO deep learning technique ALPR

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Influences of nanoparticles and chain length on thermodynamic and electrical behavior of fluorine liquid crystals

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Chinese Physics B 2022年第10期31卷 410-416页

作者： Ines Ben Amor Lotfi Saadaoui Abdulaziz N.alharbi Talal M.Althagafi Taoufik Soltani Université Tunis El Manar Laboratoire de Physique de la Matiére Molle et de la Modélisation Electromagnétique2092 Tunis Physics Department College of ScienceTaif UniversityP.O.Box 11099Taif 21944Saudi Arabia

Hydrogen-bonded polar nematic liquid crystal series with the general formula n OBAF(n = 7-12) is studied. The mesomorphic characterization is demonstrated through differential scanning calorimetry(DSC) and polarized optical microscopy(POM). The complexes with short alkyl chains(n = 7, 8) present a wide nematic range and monotropic smectic F mesophase, whereas the longer alkyl chain(n = 10-12) analogues show high melting and low clearing mesomorphic liquid crystals. The thermal range of the mesophase and the birefringence increase with chain length decreasing. Furthermore, the effect of the nanoparticles(LiNbO_(3)) on the thermal and the electrical behavior of 8OBAF are investigated. The presence of LiNbO_(3) nanoparticles increases the conductivity and reduces the resistivity of the complex.

关键词： fluorine liquid crystal polar nematic ferroelectric nanoparticles thermal stability dielectric behavior

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Hibiscus sabdariffa extract inhibits in vitro biofilm formation capacity of Candida albicans isolated from recurrent urinary tract infections

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Asian Pacific Journal of Tropical Biomedicine 2014年第2期4卷 104-108页

作者： Issam Alshami Ahmed E alharbi Department of Medical Microbiology and Immunology College of MedicineTaibah UniversityAlmadinahSaudi Arabia

Objective:To explore the prevention of rerurrent candiduria using natural based approaches and to study the antimicrobial effect of Hibiscus sabdariffa(***) extract and the biofilm forming capacity of Candida albicans strains in the present of the *** ***:In this particular study,six strains of fluconazole resistant Candida albicans isolated from recurrent candiduria were *** susceptibility of fungal isolates,time-kill curves and biofilm forming capacity in the present of the *** extract were ***:Various levels minimum inhibitory concentration of the extract were observed against all the *** inhibitory concentration values ranged from 0.5 to 2.0 mg/mL Timekill experiment demonstrated that the effect was *** biofilm inhibition assay results showed that *** extract inhibited biofilm production of all the ***:The results of the study support the potential effect of *** extract for preventing recurrent candiduria and emphasize the significance of the plant extract approach as a potential antifungal agent.

关键词： Hibiscus sabdariffa Biofilm Candiduria Candida albicans UTIs

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