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Simulated and experimental studies of a multi-band symmetric metamaterial absorber with polarization independence for radar applications

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Chinese Physics B 2022年第5期31卷 703-710页

作者： Hema O.Ali Asaad M.Al-Hindawi Yadgar I.Abdulkarim Ekasit Nugoolcharoenlap Tossapol Tippo FatihÖzkan Alkurt Olcay Altintas muharrem karaaslan Department of Communication Engineering Sulaimani Polytechnic UniversitySulaimani 46001Iraq Medical Physics Department College of Medicals and Applied ScienceCharmo UniversityChamchamal 46023SulaimaniaIraq Department of Telecommunication Engineering Faculty of EngineeringRajamangala University of Technology RattanakosinPhutthamonthonNakornprathom 73170Thailand Department of Electrical and Electronics Engineering Iskenderun Technical UniversityHatay 31100Turkey

We develop a simple new design for a multi-band metamaterial absorber(MTMA)for radar *** Simulation Technology(CST)Studio Suite 2018 was used for the numerical analysis and absorption *** simulated results show four high peaks at 5.6 GHz,7.6 GHz,10.98 GHz,and 11.29 GHz corresponding to absorption characteristics of 100%,100%,99%,and 99%,***,two different structures were designed and compared with the proposed *** proposed structure remained insensitive for any incident angle and polarization angle from 0°to60°.Moreover,negative constitutive parameters were retrieved *** support the simulated results,the proposed design was fabricated by using a computer numerical control-based printed circuit board prototyping machine and tested experimentally in a microwave *** absorption mechanism of the proposed MTMA is presented through the surface current and electric field *** novelties of the proposed structure are a simple and new design,ease of fabrication,low cost,durability,suitability for real-time applications and long-term stability given the fabrication technique and non-destructive measurement method and very high *** proposed structure has potential applications in C and X band frequency ranges.

关键词： multi-band metamaterials absorber polarization-independent negative parameters

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Tunable left-hand characteristics in multi-nested square-split-ring enabled metamaterials

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Journal of Central South University 2020年第4期27卷 1235-1246页

作者： ABDULKARIM Yadgar.I DENG Lian-wen YANG Jun-liang COLAK Sule karaaslan muharrem HUANG Sheng-xiang HE Long-hui LUO Heng School of Physics and Electronics Central South UniversityChangsha 410083China Physics Department College of ScienceUniversity of SulaimaniSulaymaniyah 46001Iraq Department of Electrical and Electronics Engineering Adana Alparslan Turkes UniversityAdana 01140Turkey Department of Electrical and Electronics Engineering Iskenderun Technical UniversityHatay 31200Turkey

Left-hand materials have drawn increasing attention from many disciplines and found widespread application, especially in microwave engineering. A sandwiched metamaterial consisting of multi-nested square-split-ring resonators on the top side and a set of wires on the back side is proposed. Scattering parameters are retrieved by high-frequency structure simulator(HFSS) software based on the finite element method. Effects of square-split-ring number on the left-hand characteristics containing negative values of permittivity, permeability, and refractive index have been intensively investigated. Simulated results show that obvious resonant left-hand characteristics could be observed within 8-18 GHz, and the resonant frequency counts are inclined to be in direct proportion to the square-split-ring number over 8-18 GHz. Besides, the proposed sandwiched metamaterial with three square-split-ring resonators and three wires presents the widest frequency band of left-hand characteristics in a range of 8-18 GHz. Further, electromagnetic field distributions demonstrated that the induced magnetic dipole dominates the resonant absorption. The multi-peak resonance characteristics of square-split-ring resonant structure are considered to be a promising candidate for selective-frequency absorption or modulation toward microwave frequency band.

关键词： metamaterial square-split-ring negative permittivity induced magnetic dipole

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Advances in the treatment of autism spectrum disorder:Wharton jelly mesenchymal stem cell transplantation

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World Journal of Methodology 2025年第1期15卷 72-79页

作者： Serdar Kabatas ErdinçCivelek Eyüp Can Savrunlu Umut karaaslan Özlem Yıldız Erdal Karaöz Department of Neurosurgery University of Health Sciences TurkeyGaziosmanpaşa Training and Research HospitalIstanbul 34255Türkiye Department of Pediatric Allergy-Immunology Institute of Health Sciences Marmara UniversityIstanbul 34865Türkiye Center for Stem Cell&Gene Therapy Research and Practice University of Health Sciences TurkeyIstanbul 34255Türkiye Department of Child and Adolescent Psychiatry University of Health SciencesGaziosmanpaşa Training and Research HospitalIstanbul 34255Türkiye Department of Child and Adolescent Psychiatry Kocaeli University Faculty of MedicineKocaeli 41001Türkiye Center for Regenerative Medicine and Stem Cell Research&Manufacturing Liv HospitalIstanbul 34340Türkiye Department of Histology and Embryology Istinye UniversityFaculty of MedicineIstanbul 34010Türkiye Center for Stem Cell and Tissue Engineering Research and Practice Istinye UniversityIstanbul 34340Türkiye

BACKGROUND Autism spectrum disorder(ASD)is a complex neurodevelopmental disorder with multifaceted *** recent studies,neuroinflammation and immune dysregulation have come to the forefront in its *** are studies suggesting that stem cell therapy may be effective in the treatment of *** To evolve the landscape of ASD treatment,focusing on the potential benefits and safety of stem cell *** A detailed case report is presented,displaying the positive outcomes observed in a child who underwent intrathecal and intravenous Wharton’s jelly-derived mesenchymal stem cells(WJ-MSCs)transplantation combined with *** The study demonstrates a significant improvement in the child’s functional outcomes(Childhood Autism Rating Scale,Denver 2 Developmental Screening Test),especially in language and gross motor *** serious side effects were encountered during the 2-year *** The findings support the safety and effectiveness of WJ-MSC transplantation in managing ASD.

关键词： Autism spectrum disorder Neurorehabilitation Stem cell transplantation Wharton jelly mesenchymal stem cells Inflammation

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Relationship between diabetic polyneuropathy, serum visfatin, and oxidative stress biomarkers

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World Journal of Diabetes 2020年第7期11卷 309-321页

作者： Banu Buyukaydin Eray Metin Guler Tahsin karaaslan Atilla Olgac Mehmet Zorlu muharrem Kiskac Abdurrahim Kocyigit Department of Internal Medicine Bezmialem Vakif University Medical FacultyIstanbul 34093Turkey Department of Medical Biochemistry Bezmialem Vakif University Medical FacultyIstanbul 34093Turkey Department of Nephrology Istanbul Medeniyet University Medical FacultyIstanbul 34093Turkey

BACKGROUND Diabetic polyneuropathy is a very common complication of *** studies are available in terms of *** examination methods with low reliability are still not standardized and generally time ***,easy-to-access methods are *** markers are one of the subjects of *** aimed to discover a potential biomarker that can be used for this purpose in patients with diabetes who have not yet developed symptoms of *** To determine the place and availability of visfatin and thiol-disulfide homeostasis in this *** A total of 392 patients with type 2 diabetes mellitus were included in the *** polyneuropathy clinical signs were evaluated with the Subjective Peripheral Neuropathy Screen Questionnaire and Michigan Neuropathy Screening Instrument questionnaire and *** biochemical parameters,oxidative stress markers,visfatin,and thiol-disulfide homeostasis were analyzed and correlated with each other and clinical *** Subjective Peripheral Neuropathy Screen Questionnaire and Michigan Neuropathy Screening Instrument questionnaire with examination scores were correlated with each other and diabetes duration(P<0.005).Neuropathy related symptoms were present in 20.7%of the patients,but neuropathy related findings were observed in 43.9%of the *** glucose,glycated hemoglobin,and visfatin were positively correlated with each ***,these parameters were positively correlated with the total oxidative stress *** and native thiol was positively correlated with total antioxidant status and negatively with oxidant *** thiol-disulfide positively correlated with higher glucose and oxidant status and negatively with total antioxidant status(P<0.005).There was no correlation between visfatin and thiol-disulphide(P=0.092,r=0.086).However,a significant negative correlation was observed between visfatin and total with native thiol(P<0.005,r=-0.

关键词： Diabetic neuropathy Diabetic foot Early detection Oxidative stress Thioldisulfide Visfatin protein

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Seasonal Changes in Copper and Cobalt Concentrations of PinusnigraL.,Cedrus libani and Cupressus arizonica Leaves to Monitor the Effects of Pollution in Elazig (Turkey)

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光谱学与光谱分析 2013年第5期33卷 1331-1337页

作者： Nagihan M karaaslan Mehmet Yaman Firat University Sciences FacultyDepartment of ChemistryElazig-Turkey

The aim of this study is to examine seasonal changes in Cu and Co concentrations of three plant species for monitoring the effects of pollution in Elazig,*** this purpose,the leaves of the Pinus nigra L.,Cedrus libani and Cupressus arizonica together with soil samples were collected from different points depending on traffic intensity,nearness the city center and cement factory as well as control location during different months of the *** atomic absorption spectrophotometer(FAAS) was used for measurement of the metals in clear digests after the dry ashing *** and Co concentrations were in the ranges from 1.3to ***-1 and

关键词： Copper cobalt biomonitor Pinus nigra L. Cedrus libani Cupressus arizonica

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Properties of AA7075 aluminum alloy in aging and retrogression and reaging process

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Transactions of Nonferrous Metals Society of China 2017年第11期27卷 2357-2362页

作者： Gokhan OZER Ahmet karaaslan Department of Metallurgical and Materials Engineering Faculty of Chemistry and Metallurgical EngineeringYildiz Technical UniversityDavutpasa-EsenlerIstanbul34210Turkey

A retrogression process was applied to AA7075alloy at180,240and320°C for1,30,50,70,*** the retrogression,aging treatment was reapplied with T6conditions(120°C,24h).The mechanical properties of aged samples were determined by V-Charpy and hardness tests and also,physical properties of samples were determined by electrical conductivity ***,microstructural properties were characterized by light microscope and transmission electron *** results show that the effects of the temperature and the duration of the retrogression and reagent on the impact toughness and hardness are related to the precipitates at the grain boundary.

关键词： aluminum alloy precipitate behavior retrogression and reaging impact toughness hardness electrical conductivity

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Infiltration of A6063 aluminium alloy into SiC-B_4C hybrid preforms using vacuum assisted block mould investment casting technique

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Transactions of Nonferrous Metals Society of China 2012年第7期22卷 1563-1567页

作者： Alptekin KISASOZ Kerem Altug GULER Ahmet karaaslan Department of Metallurgy and Materials Engineering Yildiz Technical UniversityDavutpasa CampusTR 34210EsenlerIstanbulTurkey

Production of A6063/SiC-B4C hybrid composite using vacuum assisted block mould investment casting was investigated. Firstly,SiC-B4C hybrid preforms were fabricated in cylindrical *** preferred mean particle size of the SiC and B4C powders were 60μm and 55μm *** early experiments,single powder ratio of 85%SiC and 15%B4C was selected to produce the tough ***,the preforms were placed into the cylindrical shape gypsum bonded block investment moulds and A6063 alloy was infiltrated into the preforms using vacuum assisted（-10 5 Pa）casting *** fraction of preforms was determined using Archimedes’*** fabricated cast specimens were characterized using hardness tests,image analysis and SEM observations and EDX *** result indicates that,by the vacuum assisted block mould investment casting technique,the infiltration of the preforms by molten metal was successfully realized.

关键词： AlMMC SiC B4C investment casting hybrid preform

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Cooling slope casting of AA7075 alloy combined with reheating and thixoforging

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Transactions of Nonferrous Metals Society of China 2019年第11期29卷 2237-2244页

作者： Kerem Altug GULER Alptekin KISASOZ Gokhan OZER Ahmet karaaslan Department of Metallurgical and Material Engineering Yildiz Technical UniversityTR34210IstanbulTurkey Aluminium Test Training and Research Center(ALUTEAM)Fatih Sultan Mehmet Vakif UniversityTR34445Halic CampusIstanbulTurkey

Cooling slope casting has been applied to aluminium casting alloys for producing ingots with non-dendritic ***-solid forming of the AA7075 was studied via cooling slope casting,reheating and thixoforging processes in order to determine the effect of semi-solid casting on the microstructure of the ***7075 ingots with non-dendritic microstructure were produced with cooling slope *** were characterized by light microscopy,image analysis,scanning electron microscopy and EDS *** resulting structures are promising in terms of grain size and *** was realized that grain coarsening may occur very suddenly in the reheating *** slope castings were obtained with 30°and 60°inclination angles,and in comparison,60°castings showed better ***,by using short reheating periods,semi-solid forging causes trace formation in the solid grains.

关键词： semi-solid alloy cooling slope casting thixoforging AA7075 alloy

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A combo technology of autotrophic and heterotrophic denitrification processes for groundwater treatment

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Chinese Journal of Chemical Engineering 2021年第9期34卷 121-127页

作者： Cemile Seyma Arzum Yapıcı Dilan Toprak Müjgan Yıldız Sinan Uyanık Yakup karaaslan Deniz Uçar Environmental Engineering Department Engineering FacultyHarran UniversitySanliurfa 63100Turkey Gap Renewable Energy and Energy Efficiency Center Harran UniversitySanliurfa 63100Turkey General Directorate of Water Management Republic of Turkey Ministry of Agriculture and Forestry Bestepe MahallesiYenimahalle 06560Turkey

In this study,a sequential process(heterotrophic up-flow column and completely mixed membrane bioreactors)was proposed combining advantages of the both *** system was operated for 249 days with simulated and real groundwater for nitrate removal at concentrations varying from 25 to 145 mg·L^(-1) NO_(3)^(-)-*** contribution of heterotrophic process to total nitrate removal in the system was controlled by dozing the ethanol considering the nitrate *** this way,sulfur based autotrophic denitrification rate was decreased and the effluent sulfate concentrations were *** alkalinity requirement in the autotrophic process was produced in the heterotrophic reactor,and the system was operated without alkalinity *** the study,the chemical oxygen demand in the heterotrophic reactor effluent was(23.7±22)mg L^(-1) and it was further decreased to(7.5±7.2)mg·L^(-1) in the system effluent,corresponding to a 70%*** the last period of the study,the real groundwater containing 145 mg·L^(-1) NO_(3)^(-)-N was completely *** was operated without chemical washing in the first 114 *** days 115-249 weekly chemical washing was required.

关键词： Nitrate removal Bioreactor Bioprocess Anaerobic process Groundwater treatment

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Hematological profile of COVID-19 infected children before and after the spread of the Omicron variant in Istanbul

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Asian Pacific Journal of Tropical Medicine 2022年第12期15卷 551-557页

作者： Berkin Berk Akbeyaz AyŞe karaaslan CerenÇetin Mehmet Tolga Köle Zeynep AltaŞ Yasemin Akın Department of Pediatrics University of Health SciencesKartal Dr.Lütfi Kirdar City HospitalPediatric Hematology and Oncology IstanbulTurkey Department of Pediatric Infectious Diseases University of Health SciencesKartal Dr.Lütfi Kirdar City HospitalIstanbulTurkey Department of Pediatrics University of Health SciencesKartal Dr.Lütfi Kirdar City HospitalIstanbulTurkey Department of Public Health Marmara UniversityIstanbulTurkey

Objective:To examine the effect of the COVID-19 virus,especially the Omicron variant,on hematological parameters of hospitalized pediatric patients during the COVID-19 ***:Medical records of pediatric COVID-19 patients hospitalized at Kartal Dr.Lütfi K?rdar City Hospital in Istanbul,Turkey,between March 2020 and May 2022 were retrospectively reviewed to analyze data regarding demographics,SARS-Co V-2 infection polymerase chain reaction(PCR)test results,reversetranscriptase(RT)-PCR for other respiratory agents,duration of hospital stay,and hematological and biochemical laboratory ***:Out of 467 children with a confirmed diagnosis of SARSCo V-2 infection,94(20.1%)had Omicron infection and 373(79.9%)were infected with other variants;the Omicron group had younger patients than the remaining samples(P<0.001).The most frequent clinical symptoms in all children were cough(53.5%)and fever(32.3%),followed by vomiting(20.8%).Lung involvement in the Omicron group(10.6%)was significantly lower than in the remaining samples(29.8%)(P<0.001).Hemoglobin and lymphocyte levels were lower in the Omicron-infected group(both P<0.001),while prothrombin time,activated partial thromboplastin time,international normalized ratio,and D-dimer levels were significantly higher in this group(P<0.001,P<0.001,P<0.001,and P=0.023,respectively).In terms of lung involvement,those with lung involvement were significantly older(P<0.001).Conclusions:Although lung involvement was less common with Omicron infection,this group had greater hematological system involvement,such as anemia,lymphopenia,D-dimer elevation,and coagulation disorders.

关键词： COVID Children Omicron Hematologic findings

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