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Operational Reliability Model of Hybrid MMC Considering Multiple Time Scales and Multi-state Submodule

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Journal of Modern Power Systems and Clean Energy 2021年第3期9卷 648-656页

作者： Fei Feng Juan Yu Wei Dai Zhifang Yang Xingpan Zhao Salah kamel Guobin Fu State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing UniversityChongqing 400044China Chuxiong Power Supply Bureau of Yunnan Power Grid Chuxiong 67500China Electric Power Research Institute State Grid Qinghai Electric Power CompanyXining 810008China

Environmental and electrical factors such as wind speed,air temperature and switching frequency have significant influences on the operational reliability of hybrid modular multilevel converter(MMC),which is commonly used for the wind power ***,the existing reliability model of hybrid MMC based on statistics cannot accurately reflect the impact of these *** this paper,a new operational reliability model of hybrid MMC is *** reliability index of the hybrid MMC is coupled with its operation characteristics by calculating multi-term thermal *** addition,an operation strategy of hybrid MMC is proposed to improve its *** multi-state submodule(SM)is developed,which is capable of bypassing specific faulty power modules instead of the whole *** studies show that the proposed operational reliability model could describe the impact of environmental and electrical ***,the proposed operation strategy can improve the reliability of hybrid IMMC by extending the operation time of SMs.

关键词： Modular multilevel converter(MMC) multiple time scales submodule(SM) operational reliability thermal cycling

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一种基于蚁群算法的聚类组合方法

铁道学报 2004年第4期26卷 64-69页

作者：杨燕靳蕃 Mohamed kamel 西南交通大学计算机与通信工程学院四川成都610031 Department of System Design Engineering University of Waterloo Waterloo

蚂蚁等群居类昆虫被看作能解决复杂问题的分布式系统,研究者从它们的协作性能以及自组织、信息素通信、任务划分等机理中获得灵感,已在组合优化、通信网络、机器人等许多应用领域找到解决问题的新方法。聚类作为一种无监督的学习,能根... 详细信息

蚂蚁等群居类昆虫被看作能解决复杂问题的分布式系统,研究者从它们的协作性能以及自组织、信息素通信、任务划分等机理中获得灵感,已在组合优化、通信网络、机器人等许多应用领域找到解决问题的新方法。聚类作为一种无监督的学习,能根据数据间的相似程度自动地进行分类。基于蚁群算法的聚类方法已经在当前数据挖掘研究中得到应用。本文提出的基于蚁群算法的聚类组合新方法,模仿多蚁群的协作性能,将运动速度类型各异的多个蚁群,独立而并行地进行聚类分析,然后组合其聚类结果为超图,再用蚁群算法对超图进行2次划分。实验结果表明,该方法能自动决定聚类的数目,聚类组合方法能明显改善聚类质量。

关键词：蚁群算法聚类组合超图图划分数据挖掘

基于自适应谐振理论的Web文档聚类集成方法

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西南交通大学学报 2009年第1期44卷 26-31页

作者：杨燕靳蕃 kamel Mohamed 西南交通大学信息科学与技术学院四川成都610031 Dept.of Electrical and Computer Eng. University of WaterlooWaterlooOntarioCanada N2L 3G1

提出了基于自适应谐振理论的Web文档聚类集成方法.该方法先用蚁群算法对Web文档进行聚类,再用ART神经网络对聚类结果集成.实验结果表明,集成后的聚类综合质量高于集成前的聚类综合质量.

关键词：自适应谐振理论聚类集成蚁群聚类算法 Web文档

Synthesis, Characterization and Ion Exchange Properties of a New Composite of Inorganic Ion Exchanger： Polyacrylonitrile Cerium（IV） Molybdophosphate

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Chinese Journal of Chemistry 2012年第1期30卷 177-182页

作者： Ahmadi,Seyed Javad Yavari,Ramin Ashtari,Parviz' Gholipour,Vanik kamel,Leila Rakhshandehru,Farokh Waste Management Department Nuclear Science and Technology Research InstituteP.O.Box 11365/8486TehranIran Faculty of Chemistry Tarbiat Moallem UniversityP.C.TehranIran

In this work, the synthesis of the composite of cerium（IV） molybdophosphate （CMP） and polyacrylonitrile （PAN） was reported （CMP-PAN）. The material has been characterized by elemental and spectral （FT-IR）, X-ray and thermal （TGA） analysis. Also the size analysis of the composite was done by scanning electron microscopy （SEM）. Its chemical stability in acidic, basic and saline solutions and radiation stability up to 100 kGy total expose dose were assessed. Whereas the synthesized composite has ion exchange properties, its ion exchange capacity and behavior toward several metal ions were also investigated. Further, the distribution coefficients of the metal ions were calculated. Finally, the ability of the synthesized CMP-PAN composite for the decontamination of low level liquid waste （LLLW） was investigated.

关键词： composite ion-exchange cerium(IV) molybdophosphate

Evaluation of natural radioactivity and radiological hazards in basement rocks from Gabel Abu El-Hassan in the North Eastern Desert of Egypt by multivariate statistical approach with remote sensing data

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Radiation Detection Technology and Methods 2021年第1期5卷 15-26页

作者： Atef El-Taher Mostafa kamel Abdellah Tolba Ghada Salaheldin Physics Department Faculty of ScienceAl-Azhar UniversityAssiut 71452Egypt Geology Department Faculty of ScienceAl-Azhar UniversityAssiutEgypt Physics Department Faculty of ScienceAssiut UniversityAssiut 71516Egypt

Purpose The present work deals with the natural radioactivity levels of basement rocks from Gabel Abu El-Hassan in the North Eastern Desert of *** The activity concentrations of 226Ra,232Th and 40K in rock samples were measured using a gamma-ray spectrometry with an HPGe *** Enhanced Thematic Mapper Plus(ETM+)data were processed and interpreted to create rock forming radioactive *** and conclusion The activity concentrations of 226Ra,232Th and 40K varied from 28.2±9.4 to 259.6±38.6 Bq/kg,37.9±9.9 to 297.4±54.6 Bq/kg and 487.0±73.4 to 5514.6±786.0 Bq/kg,*** radiological hazard indices(gamma index),the annual effective dose rate and excess life-time cancer risk were estimated to assess the radiological hazards due to the use of rock samples as building *** sensing data were also used to integrate between radioactive analysis and Landsat-7(ETM+)data processing to detect radioactive anomalies and to identify the uraniferous alteration zones in Abu El-Hassan area.

关键词： Natural radioactivity Radiological hazards Remote sensing Gabel Abu El-Hassan Egypt

Regional anesthesia for orthopedic procedures:What orthopedic surgeons need to know

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World Journal of Orthopedics 2022年第1期13卷 11-35页

作者： Ihab kamel Muhammad F Ahmed Anish Sethi Department of Anesthesiology Lewis Katz School of Medicine at Temple UniversityPhiladelphiaPA 19140United States

Regional anesthesia is an integral component of successful orthopedic *** anesthesia is commonly used for surgical anesthesia while peripheral nerve blocks are often used for postoperative *** evaluation for regional anesthesia should include neurological,pulmonary,cardiovascular,and hematological *** blocks include spinal,epidural,and combined spinal *** extremity peripheral nerve blocks include interscalene,supraclavicular,infraclavicular,and *** extremity peripheral nerve blocks include femoral nerve block,saphenous nerve block,sciatic nerve block,iPACK block,ankle block and lumbar plexus *** choice of regional anesthesia is a unanimous decision made by the surgeon,the anesthesiologist,and the patient based on a risk-benefit *** choice of the regional block depends on patient cooperation,patient positing,operative structures,operative manipulation,tourniquet use and the impact of postoperative motor blockade on initiation of physical *** anesthesia is safe but has an inherent risk of failure and a relatively low incidence of complications such as local anesthetic systemic toxicity(LAST),nerve injury,falls,hematoma,infection and allergic *** should be used for regional anesthesia procedures to improve the efficacy and minimize *** treatment guidelines and rescue medications(intralipid)should be readily available during the regional anesthesia administration.

关键词： Orthopedic surgery Regional anesthesia Spinal Epidural Combined spinal epidural Peripheral nerve blocks Neuraxial blocks Upper extremity Lower extremity Interscalene Supraclavicular Infraclavicular Axillary Femoral Fascia iliaca Popliteal Sciatic Saphenous Adductor canal Lumbar plexus Brachial plexus Ankle iPACK Complication Local anesthetic systemic toxicity Nerve injury Block failure Continuous nerve block catheters

Introduction to the Special Issue on Numerical Methods for Differential and Integral Equations

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Computer Modeling in Engineering & Sciences 2020年第6期123卷 913-915页

作者： Şuayip Yüzbaşı kamel Al-Khaled Nurcan BaykuşSavaşaneril Devendra Kumar Department of Mathematics Faculty of ScienceAkdeniz UniversityAntalyaTr-07058Turkey Department of Mathematics and Statistics Jordan University of Science and TechnologyIrbid22110Jordan Izmir Vocational School Dokuz Eylül UniversityİzmirTurkey Department of Mathematics University of RajasthanJaipur302004India

Differential and integral equations have a major role in many applied areas of science and engineering,For example,physics,chemistry,astronomy,biology,mechanics,electronic,economics,potential theory,***,the obtaining of solutions of these equations is *** the mentioned equations are usually difficult to solve analytically,numerical methods are ***,this Special Issue contributes to new numerical methods for solving the above-mentioned equations and thus,many problems in science and engineering can be solved using new numerical methods analyzed in this special issue.

关键词： mentioned equations Issue

Effect of ethanolic extract of Ecballium elaterium against Staphylococcus aureus and Candida albicans

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Asian Pacific Journal of Tropical Biomedicine 2011年第6期1卷 456-460页

作者： Ghaleb Adwan Yousef Salameh kamel Adwan Department of Biology and Biotechnology An-Najah N.University

Objective:To evaluate the antimicrobial activity of ethanolic extract of Ecballium elaterium(E. elaterium)fruits alone against Staphylococcus aureus(***) strains and Candida albicans(***)strains,or in combination with penicillin against Staphylococcus areus strains. Methods:Evaluation of the antimicrobial activity or synergy interaction was carried out using microdilution ***:The results showed that ethanolic extract of *** fruits has antimicrobial activity against methicillin resistant ***(MRSA),methicillin sensitive S. aureus(MSSA) and *** extract showed a significant decrease in minimum inhibitory concentrations(MIC)of penicillin against both MRSA and MSSA *** inhibitory concentration index(FIC)between penicillin and ethanolic extract of *** fruits against these test strains was less than ***:This study suggests that ethanolic extract of *** fruits has antimicrobial activity against *** and *** and there is a possibility of concurrent use of penicillin and *** extract in combination in the treatment of infections caused by MRSA and MSSA strains.A wider study is needed to identify the effective components,the mode of action and the possible toxic effect in vivo of these ingredients.

关键词： Ecballium elaterium MRSA Candida albicans Medicinal plant Plant extract Synergism

Electroconductive Composites Containing Nanocellulose,Nanopolypyrrole,and Silver Nanoparticles

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Journal of Renewable Materials 2019年第2期7卷 193-203页

作者： Samir kamel Ahmed A.Haroun Amany M.EI-Nahrawy Mohamed A.Diab Cellulose and Paper Department National Research Centre33 El Bohouth st.Dokki GizaP.O.12622Egypt Industrial Research Division National Research Centre33 El Bohouth st.Dokki GizaP.O.12622Egypt Solid State physics Department Physics Research DivisionNational Research Centre33 El Bohouth st.Dokki GizaP.O.12622Egypt

In this work,conducting composites of nanocellulose(NC)/polypyrrole nanoparticles(NPPy)and silver nanoparticles(AgNPs),i.e.,NC/NPPyAg,were synthesized for the first time,to the best of our knowledge,via in situ emulsion polymerization of pyrrole in the presence of surfactant *** AgNPs acted as an oxidizing agent to simultaneously incorporate nanoparticles into the prepared *** structures and morphologies of the prepared composites were studied using Fourier transform infrared(FTIR)spectroscopy,X-ray diffraction(XRD),UV-Vis Spectra,thermogravimetric analysis(TGA),and scanning and transmission electron microscopy(SEM and TEM)***,the prepared composites were characterized by their conductivities,and the dielectric constants(e΄),dielectric losses(e˝),and AC conductivities were studied for the prepared composites with an increasing NPPy content as a function of the frequency.

关键词： Nanocellulose nanopolypyrrole emulsion polymerization silver nanoparticles conductive nanocomposites