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Effects of magnet shapes on total harmonic distortion and cogging torque in a permanent magnet synchronous generator for wind turbines

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Clean Energy 2023年第5期7卷 1058-1068页

作者： erol Kurt Adem Dalcalı Gazi University Department of Electrical and Electronics EngineeringTechnology FacultyAnkaraTurkey Bandırma Onyedi Eylul University Department of Electrical and Electronics EngineeringFaculty of Engineering and Natural SciencesBandırmaBalıkesirTurkey National Research University TIIAME100000TashkentUzbekistan

This paper explores and theoretically reports the effects of different magnet structures on the cogging torque and the total harmonic distortion of the output waveforms from a permanent magnet *** generator is a radial flux machine and four different structures are considered for the magnet arrangement in the rotor component and modelled in the Ansys/Maxwell electromagnetic simulation *** three-phase machine exhibits different behaviours towards various magnet structures,***,inclined slotted rectangular,skewed double rectangular and inclined slotted skewed double rectangular,*** has been proven by finite element analysis and Fourier analysis that both the cogging and total harmonic distortion values vary significantly for all *** cogging torque values change in the range of 89.95 to 436.75 mNm and the lowest cogging torque is measured for the inclined slotted skewed double rectangular magnet geometry,while the conventional rectangular magnet geometry yields the worst value with 436.75 ***,the total harmonic distortion values varies between 1.63 and 3.55 for different magnetic *** the worst total harmonic distortion value is obtained from the inclined slotted rectangular magnet,the best total harmonic distortion is acquired from the skewed double rectangular *** these results will provide scientists and engineers with important information in order to obtain more efficient machines.

关键词： renewable energy wind power finite element method synchronous generator wind turbines

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Levels of matrix metalloproteinase-1 and tissue inhibitors of metalloproteinase-1 in gastric cancer

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World Journal of Gastroenterology 2011年第16期17卷 2109-2112页

作者： Ozgur Kemik Ahu Sarbay Kemik Aziz Sümer Ahmet Cumhur Dulger Mine Adas Huseyin Begenik Ismail Hasirci Ozkan Yilmaz sevim Purisa erol Kisli Sefa Tuzun Cetin Kotan Department of General Surgery Yuzuncu Y1l University Medical Faculty Department of Biochemistry Cerrahpasa Medical Faculty University of Istanbul Department of Gastroenterology Medical FacultyUniversity of Yüzüncü Y1l Department of Endocrinology Okmeydani Education and Research Hospital Department of Internal Medicine Medical FacultyUniversity of Yüzüncü Y1l Department of Biostatistics Istanbul Medical FacultyUniversity of Istanbul II.General Surgery Haseki Education and Research Hospital

AIM:To evaluate the levels of preoperative serum matrix metalloproteinase-1 (MMP-1) and tissue inhibitor of metalloproteinase-1 (TIMP-1) in gastric ***:One hundred gastric cancer patients who underwent gastrectomy were enrolled in this *** serum concentrations of MMP-1 and TIMP-1 in these patients and in fifty healthy controls were determined using an enzyme-linked immunosorbent ***:Higher serum MMP-1 and TIMP-1 levels were observed in patients than in controls (P < 0.001).Serum MMP-1 and TIMP-1 levels were positively associated with morphological appearance,tumor size,depth of wall invasion,lymph node metastasis,liver metastasis,perineural invasion,and pathological *** were not significantly associated with age,gender,tumor location,or histological ***:Increased MMP-1 and TIMP-1 were associated with gastric *** these markers are not good markers for diagnosis,these markers show in advanced gastric cancer.

关键词： Gastric cancer Matrix metalloproteinase-1 Tissue matrix metalloproteinase-1

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Effect of layer thickness on the flexural property and microstructure of 3D-printed rhomboid polymer-reinforced cemented tailing composites

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International Journal of Minerals,Metallurgy and Materials 2023年第2期30卷 236-249页

作者： Ziyue Zhao Shuai Cao erol Yilmaz State Key Laboratory of High-Efficient Mining and Safety of Metal Mines of Ministry of Education University of Science and Technology BeijingBeijing 100083China School of Civil and Resource Engineering University of Science and Technology BeijingBeijing 100083China Department of Civil Engineering Geotechnical DivisionRecep Tayyip Erdoğan UniversityFenerRize TR53100Turkey

For mines with poor ore bodies and surrounding rocks,the general mining method does not allow the ore to be extracted from underground safely and *** these mines,the downward layered filling mining technique is undoubtedly the most suitable mining *** downward filling mining technique may eliminate the troubles relating to poor ore deposit conditions,such as production safety,ore loss rate,and depletion ***,in this technique,the safety of the artificial roof of the next stratum is of paramount *** tailings backfilling(CTB)that is not sufficiently cemented and causes collapses could threaten ore *** paper explores a diamond-shaped composite structure to mimic the stability of a glued false roof in an actual infill mine based on the recently emerged three-dimensional(3D)printing *** means such as three-point bending and digital image correlation(DIC)techniques were used to explore the flexural characteristics of 3D construction specimens and CTB combinations with different cement/tailings weight ratios at diverse layer *** results show that the 3D structure with a 14-mm ply height and CTB has strong flexural characteristics,with a maximum deflection value of 30.1 mm,while the 3D-printed rhomboid polymer(3D-PRP)structure with a 26-mm ply height is slightly worse in terms of flexural strength characteristics,but it has a higher maximum flexural strength of 2.83 MPa.A combination of 3D structure and CTB has more unique mechanical properties than CTB *** research work offers practical knowledge on the artificial roof performance of the downward layered filling mining technique and builds a scientific knowledge base regarding the successful application of CTB material in mines.

关键词： tailings cemented fills 3D printed rhomboidal polymer three-point bending test digital image correlation

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Compressive fatigue behavior and failure evolution of additive fiber-reinforced cemented tailings composites

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International Journal of Minerals,Metallurgy and Materials 2022年第2期29卷 345-355页

作者： Jiajian Li Shuai Cao erol Yilmaz Yunpeng Liu School of Civil and Resources Engineering University of Science and Technology BeijingBeijing 100083China State Key Laboratory of High-Efficient Mining and Safety of Metal Mines of Ministry of Education University of Science and Technology BeijingBeijing 100083China Department of Civil Engineering Geotechnical DivisionRecep Tayyip Erdogan UniversityFenerRize TR53100Turkey State Key Laboratory of Silicate Materials for Architectures(Wuhan University of Technology) Wuhan 430070China

The ordinary cemented tailings backfill(CTB)is a cement-based composite prepared from tailings,cementitious materials,and *** this study,a series of laboratory tests,including uniaxial compression,digital image correlation measurement,and scanning electron microscope characteristics of fiber-reinforced CTB(FRCTB),was conducted to obtain the uniaxial compressive strength(UCS),failure evolution,and microstructural characteristics of FRCTB *** results show that adding fibers could increase the UCS values of the CTB by 6.90%to 32.76%.The UCS value of the FRCTB increased with the increase in the polypropylene(PP)fiber ***,the reinforcement effect of PP fiber on the CTB was better than that of glass *** addition of fiber could increase the peak strain of the FRCTB by0.39%to 1.45%.The peak strain of the FRCTB increased with the increase in glass fiber *** failure pattern of the FRCTB was coupled with tensile and shear *** addition of fiber effectively inhibited the propagation of cracks,and the bridging effect of cracks by the fiber effectively improved the mechanical properties of the *** findings in this study can provide a basis for the backfilling design and optimization of mine backfilling methods.

关键词： cemented tailings backfill uniaxial compressive strength combined fiber reinforcement digital image correlation microstructural characteristics

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ELECTRORHEOLOGY AND CREEP-RECOVERY BEHAVIOR OF CONDUCTING POLYTHIOPHENE/POLY(OXYMETHYLENE)-BLEND SUSPENSIONS

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Chinese Journal of Polymer Science 2012年第1期30卷 16-25页

作者： Ozlem erol H.Ibrahim Unal Bekir Sari Smart Materials Research Lab Chemistry Department Gazi UniversityAnkaraTurkey

Electrorheological properties and creep-recovery behavior of polythiophene/polyoxymethylene-blend having PT（50%）/POM（50%） composition were *** size,conductivity and dielectric values were measured to be 24.77μm,3.85×10^（-5） S·m^（-1） and 26.75,*** ratio was measured to be 64%at the end of 16 *** effects of dispersed particle volume fraction,external electric field strength,shear rate,frequency and temperature on ER properties and storage modulus of PT/POM-blend/silicone oil（SO） suspensions were *** were observed in the electric field viscosities of the suspensions and thus they were classified as a smart *** thinning non-Newtonian viscoelastic behavior was determined for PT/POM-blend/SO ***,time-dependent deformation was examined by creep-recovery tests and recoverable viscoelastic deformation established.

关键词： Conducting polythiophene/poly(oxymethylene) Blends Electrorheogical fluids Creep-recovery behavior

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Current diagnostic tools and treatment modalities for rectal prolapse

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World Journal of Clinical Cases 2023年第16期11卷 3680-3693页

作者： Mustafa Oruc Timucin erol Department of General Surgery Hacettepe University School of MedicineAnkara 06100Turkey

Rectal prolapse is a circumferential,full-thickness protrusion of the rectum through the *** is a rare condition,and only affects 0.5%of the general *** treatment modalities have been described,which have changed significantly over *** in the last decade,laparoscopic and robotic surgical approaches with different mobilization techniques,combined with medical therapies,have been widely *** patients have presented with a wide range of complaints(ranging from abdominal discomfort to incomplete bowel evacuation,mucus discharge,constipation,diarrhea,and fecal incontinence),understanding the extent of complaints and ruling out differential diagnoses are essential for choosing a tailored surgical *** is crucial to assess these additional symptoms and their severities using preoperative scoring ***,radiological and physiological evaluations may explain some vague symptoms and reveal concomitant pelvic ***,there is no consensus on or standardization of the optimal extent of dissection,type of procedure,and materials used for rectal fixation;this makes providing maximum benefits to patients with minimal complications *** recent publications and systematic reviews have not recommended the most appropriate treatment *** review explains the appropriate diagnostic tools for different conditions and summarizes the current treatment approaches based on existing literature and expert opinions.

关键词： Rectal prolapse Constipation Fecal incontinence Diagnosis Minimally invasive surgical procedures Colorectal surgery

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Impact of different sampling rates on precise point positioning performance using online processing service

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Geo-Spatial Information Science 2021年第2期24卷 302-312,I0008页

作者： Serdar erol Reha Metin Alkan İ.Murat Ozulu Veli Ilçi Department of Geomatics Engineering Istanbul Technical UniversityIstanbulTurkey Department of Technical Programs Hitit UniversityÇorumTurkey Department of Geomatics Engineering Ondokuz Mayıs UniversitySamsunTurkey

In this study,the effect of different sampling rates(*** recording interval)on the Precise Point Positioning(PPP)solutions in terms of accuracy was *** this purpose,a field test was carried out inÇorum province,Turkey,on 11 September *** this context,a Geodetic Point(GP)was established and precisely coordinated.A static GNSS measurement was occupied on the GP for about 4-hour time at 0.10 second(s)/10 Hz measurement intervals with the Trimble R10 geodetic grade GNSS *** original observation file was converted to RINEX format and then decimated into the different data sampling rates as 0.2 s,0.5 s,1 s,5 s,10 s,30 s,60 s,and 120 *** these RINEX observation files were submitted to the Canadian Spatial Reference System-Precise Point Positioning(CSRS-PPP)online processing service the day after the data collection date by choosing both static and kinematic processing *** this way,PPP-derived static coordinates,and the kinematic coordinates of each measurement epoch were *** PPP-derived coordinates obtained from each decimated sampling intervals were compared to known coordinates of the GP for northing,easting,2D position,and height *** to the static and kinematic processing results,high data sampling rates did not change the PPP solutions in terms of accuracy when compared to the results obtained using lower sampling *** results of this study imply that it was not necessary to collect GNSS data with high-rate intervals for many surveying projects requiring cm-level accuracy.

关键词： Precise Point Positioning(PPP) online GNSS postprocessing service high-rate GNSS sampling rate monitoring structure behavior

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Portal biliopathy,magnetic resonance imaging and magnetic resonance cholangiopancreatography findings:a case series

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Gastroenterology Report 2016年第1期4卷 68-72,I0003页

作者： Ozdil Baskan Cengiz erol Yusuf Sahingoz Department of Radiology School of MedicineIstanbul Medipol UniversityTurkey Department of Radiology Istanbul Medipol Mega University HospitalTurkey

Portal biliopathy(PB)is a rare disorder,characterized by biliary ductal and gallbladder wall abnormalities seen in patients with portal *** most commonly occurs due to idiopathic extrahepatic portal vein obstruction(EHPVO).The abnormalities consist mainly of bile duct compression,stenoses,fibrotic strictures and dilation of both extrahepatic and intrahepatic bile ducts,as well as gallbladder *** may mimic cholangiocarcinoma,sclerosing cholangitis,or *** can be avoided using appropriate imaging modalities to prevent *** present the magnetic resonance imaging(MRI)and magnetic resonance cholangiography(MRCP)features of three patients with PB.

关键词： biliary system cavernous transformation portal biliopathy magnetic resonance imaging magnetic resonance cholangiography

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Editorial for special issue on frontiers and advances in cemented paste backfill

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International Journal of Minerals,Metallurgy and Materials 2023年第8期30卷 1427-1429页

作者： Shenghua Yin Chongchong Qi erol Yilmaz Shuai Cao Qiusong Chen School of Civil and Resource Engineering University of Science and Technology BeijingBeijing100083China School of Resources and Safety Engineering Central South UniversityChangsha410083China Department of Civil Engineering Geotechnical DivisionRecep Tayyip Erdogan UniversityFenerRizeTR53100Turkey

As an important guarantee for human survival and development,the increasing use of mineral resources has led to the generation of a large amount of tailings and ***,with the deep promotion of green concepts such as solid waste resource utilization and sustainable development,adding additives to tailings as filling materials can not only improve resource utilization efficiency and prevent surface collapse,but also reduce solid waste discharge to the surface,which is an effective way to fully utilize tailings resources and achieve land and energy saving,environmental protection,and waste utilization.

关键词： cemented utilize frontier

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A case of mediastinal mesenchymal tumor resembling hemopericardium

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Journal of Geriatric Cardiology 2021年第7期18卷 591-594页

作者： Aynur Acibuca Mustafa Yilmaz Elif Karadeli Emine Tuba Canpolat Tansel erol Department of Cardiology Baskent University School of MedicineDr Turgut Noyan Practice and Research CenterAdanaTurkey Department of Radiology Baskent University School of MedicineDr Turgut Noyan Practice and Research CenterAdanaTurkey Department of Pathology Baskent University School of MedicineDr Turgut Noyan Practice and Research CenterAdanaTurkey

Mediastinal neoplasms are rare in the elderly,and clinical suspicion is the first and most important step of differential *** tumors can be misdiagnosed because their symptoms or signs can overlap with cardiovascular diseases,which have a higher prevalence among the older *** diagnostic process should be managed with multimodality imaging and clinical ***,the case of a 74-year-old male patient,who presented with shortness of breath,is examined.A chest X-ray revealed an increased cardiothoracic ratio,and he was diagnosed with hemopericardium following an emergent chest computed *** the echocardiography,it was suspected that a hyperechogenic area adjacent to the heart might be due to a mass,and further examinations confirmed a mediastinal neoplasm.A surgical biopsy was performed,and it was determined to be a mesenchymal *** conclude,clinicians should keep in mind the possibility of paracardiac neoplasm in the elderly,as well as in other age groups,when encountering mediastinal widening so that the patient can be protected from unnecessary interventions such as pericardiocentesis.

关键词： neoplasms neoplasm media

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