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Indirect Vector Control of Linear Induction Motors Using Space Vector Pulse Width Modulation

Computers, Materials & Continua 2023年第3期74卷 6263-6287页

作者： Arjmand Khaliq Syed Abdul Rahman Kashif Fahad Ahmad Muhammad Anwar Qaisar shaheen Rizwan Akhtar Muhammad Arif Shah Abdelzahir Abdelmaboud Electrical Engineering Department University of Engineering and TechnologyLahore54700Pakistan Department of Basic Sciences Deanship of Common First YearJouf UniversitySakakaAljouf72341Saudi Arabia Department of Information Science Division of Science and TechnologyUniversity of EducationLahore54000Pakistan Department of Computer Science and Information Technology The Islamia University of BahawalpurRahim Yar Khan Sub CampusPakistan Department of IT and Computer Science Pak-Austria Fachhochschule Institute of Applied Sciences and TechnologyHaripurPakistan Department of Information Systems King Khalid UniversityMuhayel Aseer61913Saudi Arabia

Vector control schemes have recently been used to drive linear induction motors(LIM)in high-performance *** trend promotes the development of precise and efficient control schemes for individual *** research aims to present a novel framework for speed and thrust force control of LIM using space vector pulse width modulation(SVPWM)*** framework under consideration is developed in four *** begin,MATLAB Simulink was used to develop a detailed mathematical and electromechanical *** research presents a modified SVPWM inverter control *** tuning the proportional-integral(PI)controller with a transfer function,optimized values for the PI controller are *** the subsystems mentioned above are integrated to create a robust simulation of the LIM’s precise speed and thrust force control *** reference speed values were chosen to evaluate the performance of the respective system,and the developed system’s response was verified using various data *** the low-speed range,a reference value of 10m/s is used,while a reference value of 100 m/s is used for the high-speed *** speed output response indicates that themotor reached reference speed in amatter of seconds,as the delay time is between 8 and 10 *** maximum amplitude of thrust achieved is less than 400N,demonstrating the controller’s capability to control a high-speed LIM with minimal thrust *** to the controlled speed range,the developed system is highly recommended for low-speed and high-speed and heavy-duty traction applications.

关键词： Space vector pulse width modulation linear induction motor proportional-integral controller indirect vector control electromechanical dynamic modeling

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Enhanced thermoelectric performance of CoSbS_(0.85)Se_(0.15) by point defect

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Rare Metals 2018年第4期37卷 326-332页

作者： Shan-Shan Zhang Ding-Feng Yang Nusrat shaheen Xing-Chen Shen Dan-Dan Xie Yan-Ci Yan Xu Lu Xiao-Yuan Zhou Department of Applied Physics Chongqing University Institute of Microstructure and Properties of Advanced Materials Beijing University of Technology

In this study, we report the effect of Zn doping on the thermoelectric properties of CO1-xZnxSbS0.85Se0.15 solid solutions （x = 0, 0.02, 0.05, 0.08）. The results show the dimensionless figure of merit （zT） increases from 0.17 to 0.34 at 875 K for Co0.95Zn0.05SbS0.85Se0.15 sample, due to the noticeable decrease in the lattice thermal conductivity by introducing point defect, which is further confirmed by an analysis based on the Debye-Callaway- Klemens model. Meanwhile, the thermoelectric power factor is maintained at high temperatures. This work highlights the important role of point defect in improving the thermoelectric performance of CoSbS-based compounds.

关键词： CoSbS Point defect Thermal conductivity Thermoelectric performance

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Journey of a patient with scleroderma from renal failure up to kidney transplantation

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World Journal of Transplantation 2021年第9期11卷 372-387页

作者： Fedaey Abbas Mohsen El Kossi Ihab Sakr shaheen Ajay Sharma Ahmed Halawa Department of Nephrology Faculty of Health and ScienceUniversity of LiverpoolInstitute of Learning and TeachingSchool of MedicineLiverpool L693GBUnited Kingdom Doncaster Renal Unit Doncaster Royal InfirmaryDoncaster DN25LTUnited Kingdom Department of Paediatric Nephrology St James’s University HospitalGlasgow G514TFUnited Kingdom Department of Transplant Surgery Royal Liverpool University HospitalLiverpool L78XPUnited Kingdom Department of Transplant Surgery Sheffield Teaching HospitalSheffield S57AUUnited Kingdom

The increased awareness of systemic sclerosis(SS)and its pathogenetic background made the management of this disease more amenable than previously ***,scleroderma renal crisis(SRC)is a rarely seen as an associated disorder that may involve 2%-15%of SS *** presented with earlier,rapidly progressing,diffuse cutaneous SS disease,mostly in the first 3-5 years after non-Raynaud clinical manifestations,are more vulnerable to develop *** comprises a collection of acute,mostly symptomatic rise in blood pressure,elevation in serum creatinine concentrations,oliguria and thrombotic microangiopathy in almost 50%of *** advent of the antihypertensive angiotensin converting enzyme inhibitors in 1980 was associated with significant improvement in SRC *** a scleroderma patient maintained on regular dialysis;every effort should be exerted to declare any possible evidence of renal recovery.A given period of almost two years has been suggested prior to proceeding in a kidney transplant(KTx).Of note,SS patients on dialysis have the highest opportunity of renal recovery and withdrawal from dialysis as compared to other causes of end-stage renal disease(ESRD).KTx that is the best well-known therapeutic option for ESRD patients can also be offered to SS *** to other primary renal diseases,SS-related ESRD was considered for a long period of poor patient and allograft *** involvement in an SS patient is considered a strong post-transplant independent risk factor of *** of SRC after transplantation has been observed in some ***,an excellent post-transplant patient and graft outcome have been recently ***,the absence of extrarenal manifestations in an SS-induced ESRD patient can be accepted as a robust indicator for a successful KTx.

关键词： Systemic sclerosis Scleroderma renal crisis Risk factors Renal failure Hemodialysis Kidney transplant

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Poultry Manure as an Organic Fertilizer with or without Biochar Amendment:Influence on Growth and Heavy Metal Accumulation in Lettuce and Spinach and Soil Nutrients

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Phyton-International Journal of Experimental Botany 2021年第2期90卷 651-676页

作者： Hira Javaid Siddiqui Shamim Gul Attiq-ur-Rehman Kakar Umbreen shaheen Gul Bano Rehman Naqeebullah Khan Samiullah Department of Botany University of BalochistanQuetta87300Pakistan Department of Natural Resource Sciences McGill UniversityQuebecH9X 3V9Canada Department of Chemistry University of BalochistanQuetta87300Pakistan Department of Zoology University of BalochistanQuetta87300Pakistan

This pot-based study investigated the influence of poultry manure and 1:1 mixture of poultry manure+biochar(produced from farmyard manure[FYM]or wood),on the biomass production and concentration of heavy metals in leaves of lettuce and *** concentration of mineral nitrogen(N)and soluble inorganic phosphorus(P)of soils cultivated with these vegetables was also *** application of poultry manure or FYM biochar in soil as 10%(equivalent to 60 t ha^(-1),an estimated 1726.8 kg ha^(-1)N in poultry manure and 1353.9 kg ha^(-1)N in FYM)and 15%amendment(equivalent to 90 t ha^(-1),an estimated 2590.2 kg ha^(-1)N in poultry manure and 2030.8 kg ha^(-1)N in FYM)significantly decreased biomass production of lettuce as compared to control(no fertilizer added)***,mixture of poultry manure with wood-derived biochar at both application rates(i.e.,10%and 15%)and with FYM biochar at lower application rate(i.e.,10%)caused 2-3-fold increase in aboveground plant biomass and 2-14-fold increase in root biomass(p<0.05).Furthermore,as compared to control treatment,a significant~2-3-fold increase in aboveground plant biomass was also observed in response to mixture of poultry manure with wood-derived and FYM derived biochars at 10%amendment *** compared to control treatment,concentration of mineral N and soluble inorganic P were higher in soils of all other *** spinach,amendment of poultry manure or its co-amendment with biochar of FYM significantly increased aboveground plant biomass at 7%(equivalent to 42 t ha^(-1))as compared to 3%and 5%amendment rates(equivalent to 18 and 30 t ha^(-1)respectively).The concentration of soil mineral N and soil soluble mineral P was not different between *** lettuce,wood-derived biochar did not reduce concentration of heavy metals(i.e.,manganese(Mn),copper(Cu),iron,(Fe),cadmium(Cd),lead(Pb),nickel(Ni)and cobalt(Co)than FYM-derived biochar while in spinach,as compared to poultry manure,co-amendment of

关键词： Biochar poultry manure lettuce spinach

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Atypical pathogens in community acquired pneumonia of Egyptian children

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Asian Pacific Journal of Tropical Medicine 2009年第2期2卷 1-8页

作者： Deraz TE El Sahriggy Sa.shaheen MA Motawea AA Gomaa HE Fawzy SH Mohamed AA Pediatric Department Ain Shams Faculty of Medicine Pediatric Department National Research Center Clinical Pathology Department National Research Center Microbiology Department Ain Shams Faculty of Medicine Cairo 11371 Egypt

Objective:Diagnosis of atypical pathogens as an aetiology for community-acquired pneumonia(CAP) in children is a challenge world *** aim of this study was to detect the frequency of atypical pathogens as a cause of community-acquired pneumonia(CAP) in Egyptian ***:From 50 children(with age ranged from 2 months to 12 years) hospitalized for community-acquired pneumonia;respiratory sputum samples were collected by induction or *** samples were subjected to conventional cultures and Polymerase Chain Reaction(PCR) technique DNA extraction for identification of Mycoplasma,Chlamydia pneumoniae and Legionella ***;A definite pathogen was identified in 78%of the studied children;30% typical bacteria,8%Candida albicans and atypical bacteria in 40%of the pneumonic *** pneumoniae was isolated from 26%of the children while Mycoplasma pneumoniae was isolated from 14%, whereas Legionella pneumophilla was not isolated at ***;Atypical pathogens are evident as a potential aetiology for community-acquired pneumonia in(13.3%) of young and(80%) of older Egyptian children.

关键词： Atypical pathogens Community-acquired pneumonia Children Egypt

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Post-transplantation lymphoproliferative disorders:Current concepts and future therapeutic approaches

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World Journal of Transplantation 2020年第2期10卷 29-46页

作者： Fedaey Abbas Mohsen El Kossi Ihab Sakr shaheen Ajay Sharma Ahmed Halawa Nephrology Department Jaber El Ahmed Military HospitalSafat 13005Kuwait Faculty of Health and Science University of LiverpoolInstitute of Learning and TeachingSchool of MedicineLiverpool L693GBUnited Kingdom Doncaster Royal Infirmary Doncaster DN25LTUnited Kingdom Department of Paediatric Nephrology Royal Hospital for ChildrenGlasgow G514TFUnited Kingdom Department of Transplant Surgery Royal Liverpool University HospitalsLiverpool L78XPUnited Kingdom Department of Transplantation Sheffield Teaching HospitalsSheffield S57AUUnited Kingdom

Transplant recipients are vulnerable to a higher risk of malignancy after solid organ transplantation and allogeneic hematopoietic stem-cell *** lymphoproliferative disorders(PTLD)include a wide spectrum of diseases ranging from benign proliferation of lymphoid tissues to frank malignancy with aggressive *** main risk factors of PTLD are:Firstly,the cumulative immunosuppressive burden,and secondly,the oncogenic impact of the Epstein-Barr *** latter is a key pathognomonic driver of PTLD *** the last two decades,a considerable progress has been made in diagnosis and therapy of *** treatment of PTLD includes reduction of immunosuppression,rituximab therapy,either isolated or in combination with other chemotherapeutic agents,adoptive therapy,surgical intervention,antiviral therapy and *** this review we shall discuss the prevalence,clinical clues,prophylactic measures as well as the current and future therapeutic strategies of this devastating disorder.

关键词： Lymphoproliferative disorders Epstein-Barr virus Solid organ transplant Hematopoietic stem cell transplant Post-transplant lymphoproliferative disorder prevention Future therapies

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Burden of pediatric influenza A virus infection post swine-flu H1N1pandemic in Egypt

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Asian Pacific Journal of Tropical Medicine 2013年第9期6卷 693-698页

作者： Adel Khattab Malak shaheen Terez Kamel Amel El Faramay Safaa Abd El Rahman Dalia Nabil Mohamed Gouda Influenza Advisory Board Egyptian Ministry of Health Chest Department Faculty of MedicineAin Shams University Pediatrics Department Faculty of MedicineAin Shams University Medical Microbiology and Immunology Department Faculty of MedicineAin Shams University

Objectne:To screen children with influenza like illness or with symptoms of acute respiratory tract infections for influenza A virus infection-post swine flu pandemic era-using rapid influenza diagnostic ***:During two year,(2010&2011),1200 children with influenza like illness or acute respiratory tract infections(according to World Health Organization criteria)were *** ages ranged from 2-60 *** aspirates specimens were collected from all children for rapid influenza A diagnostic ***:Influenza A virus rapid test was positive in 47.5%of the children;the majority(89.6%)were presented with lower respiratory tract *** rate and temperature were significantly higher among positive rapid influenza test ***:Influenza A virus infection is still a major cause of respiratory tract infections in Egyptian *** should be considered in all cases with cough and febrile episodes and influenza like symptoms even post swine flu pandemic.

关键词： Influenza A virus Burden Children Influenza like illness Egypt

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Regular perturbation solution of Couette flow(non-Newtonian)between two parallel porous plates: a numerical analysis with irreversibility

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Applied Mathematics and Mechanics(English Edition) 2021年第1期42卷 127-142页

作者： M.NAZEER M.I.KHAN S.KADRY Yuming CHU F.AHMAD W.ALI M.IRFAN M.shaheen Department of Mathematics Institute of Arts and SciencesGovernment College UniversityChiniot CampusFaisalabad 35400Pakistan Department of Mathematics and Statistics Riphah International University I-14Islamabad 44000Pakistan Department of Mathematics and Computer Science Beirut Arab UniversityBeirut 11-5020Lebanon Department of Mathematics Huzhou UniversityHuzhou 313000Zhejiang ProvinceChina Hunan Provincial Key Laboratory of Mathematical Modeling and Analysis in Engineering Changsha University of Science&TechnologyChangsha 410114China Department of Applied Sciences National Textile UniversityFaisalabad 38000Pakistan Chair of Production Technology Faculty of Engineering TechnologyUniversity of TwenteEnschede 7500 AEThe Netherlands Department of Mathematics Riphah Inernational LniversityFaisalabad CampusFaiselabad 38000Pakistan

The unavailability of wasted energy due to the irreversibility in the process is called the entropy *** irreversible process is a process in which the entropy of the system is *** second law of thermodynamics is used to define whether the given system is reversible or ***,our focus is how to reduce the entropy of the system and maximize the capability of the *** are many methods for maximizing the capacity of heat *** constant pressure gradient or motion of the wall can be used to increase the heat transfer rate and minimize the *** objective of this study is to analyze the heat and mass transfer of an Eyring-Powell fluid in a porous *** this,we choose two different fluid models,namely,the plane and generalized Couette *** flow is generated in the channel due to a pressure gradient or with the moving of the upper *** present analysis shows the effects of the fluid parameters on the velocity,the temperature,the entropy generation,and the Bejan *** nonlinear boundary value problem of the flow problem is solved with the help of the regular perturbation *** validate the perturbation solution,a numerical solution is also obtained with the help of the built-in command NDSolve of MATHEMATICA *** velocity profile shows the shear thickening behavior via first-order Eyring-Powell *** is also observed that the profile of the Bejan number has a decreasing trend against the Brinkman ***ηi→0(i=1,2,3),the Eyring-Powell fluid is transformed into a Newtonian fluid.

关键词： Couette flow Eyring-Powell fluid entropy generation perturbation method Bejan number

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Influence of Some Limitations on Optical Communication Reliability Through

Influence of Some Limitations on Optical Communication Relia...

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作者：米度（shaheen.MAHMOUD）北京理工大学

学位级别：硕士

随着对高速和防窃听通信系统日益增长的需求,在空间和大气层内的自由空间光通信(FSO)系统,逐渐成为了研究员们的一个热门话题。从事光通信有关研究的科学家们在涉及卫星链接、深空探测器地面站、高空平台(HAPs)、飞机等的领域显示出了...

随着对高速和防窃听通信系统日益增长的需求,在空间和大气层内的自由空间光通信(FSO)系统,逐渐成为了研究员们的一个热门话题。从事光通信有关研究的科学家们在涉及卫星链接、深空探测器地面站、高空平台(HAPs)、飞机等的领域显示出了极大兴趣。然而,我们都知道,当光波传播通过大气层,它的振幅和相位在时间和空间上都将受到大气层中折射率随机波动的严重影响,这也被称为光学湍流,无论是在空间和时间的随机波动。因此,当我们要建立不同空间之间的光通信可靠链接时定量地估计不同的统计数量非常重要,其中,这些统计数量与大气湍流造成的光强闪烁是紧密相连的。本文中,我们在不同传播场景进行了与激光通信链相关的柯尔莫哥洛夫和非柯尔莫哥洛夫湍流统计,并分析了不同湍流谱模型对光通信链路的影响。结果中包含的定量数据证明,在激光通信通道中非柯尔莫哥洛夫湍流相比于柯尔莫哥洛夫湍流而已更加重要,因此中无线光通信中十分有必要考虑到湍流。

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Effect of different deformation and annealing procedures on non-magnetic textured Cu_(60)Ni_(40) alloy substrates

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International Journal of Minerals,Metallurgy and Materials 2018年第8期25卷 930-936页

作者： Jin Cui Hong-li Suo Jin-hua Wang Jean-Claude Grivel Lin Ma Chun-yan Li Yao-tang Ji shaheen Kausar Min Liu Yi Wang College of Materials Science and Engineering Beijing University of Technology Department of Energy Conversion and Storage Technical University of Denmark

In this work,a series of specimens was prepared by the casting *** cube-textured substrates were processed by heavy cold rolling and recrystallization annealing(i.e.,the rolling-assisted biaxially textured substrates(RABi TS) method).Both the rolling and the recrystallization texture in the alloy tapes were investigated by X-ray diffraction and electron back-scatter diffraction,*** results showed that a strong copper-type deformation texture was obtained in the heavy cold-rolled *** addition,the recrystallization annealing process was found to be very important for the texture transition in the Cu–Ni alloy *** cube texture content in the Cu60 Ni40 alloy substrates reached 99.7%(≤10°) after optimization of the cold-rolling procedure and the recrystallizing heat-treatment process,whereas the content of low-angle grain boundaries(from 2° to 10° misorientation) in the substrate reached 95.1%.

关键词： non-magnetic CuNi alloy substrates annealing cube texture

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