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Alternating-current losses in two-layer superconducting cables consisting of second-generation superconductors coated by U-shaped ferromagnetic materials

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Chinese Physics B 2013年第12期22卷 509-513页

作者： ahmet Cicek Fedai Inanir Fedor Gmry Department of Physics Faculty of Arts and Sciences Mehmet Akif Ersoy University Department of Physics Faculty of Arts and Sciences Recep Tayyip Erdog an University Institute of Electrical Engineering Slovak Academy of Sciences Du'bravska' Cesta 9 842 39 Bratislava Slovakia

Alternating-current losses in a two-layer superconducting cable, each layer being composed of 15 closely-spaced rectangular wires made up of second-generation superconductors when the ends of wires are coated by either a non-magnetic or strong ferromagnetic material having a U profile is numerically investigated. Computations are carried out through the finite-element method. The alternating-current losses do not increase significantly if the relative permeability of the coating is increased three orders of magnitude, provided that the current amplitude is less than half of the critical current in a superconducting wire. However, the losses are much higher for ferromagnetic coating if the amplitude of the applied current oscillating at 50 Hz is close to the critical current. The ferromagnetic coating is seen to accumulate the magnetic field lines normally on its surfaces, while the field lines are parallel to the long axes of the wires, leading to more significant flux penetration in the coated regions. This facilitates a uniform low-loss current flow in the uncoated regions of the wires. In contrast, coating with a non-magnetic material gives rise to a considerably smaller current flow in the uncoated regions, whereas the low-loss flow is maintained in the coated regions. Moreover, the current flows in opposite directions in the coated and uncoated regions, where the direction in each region is converse for the two materials.

关键词： second-generation superconductor two-layer cable ferromagnetic coating U profile alternating-current losses

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Interaction properties of solitons for a couple of nonlinear evolution equations

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Chinese Physics B 2021年第1期30卷 185-190页

作者： Syed Tahir Raza Rizvi Ishrat Bibi Muhammad Younis ahmet Bekir Department of Mathematics COMSATS University IslamabadLahore CampusPakistan Punjab University College of Information Technology University of the PunjabLahorePakistan Neighbourhood of Akcaglan Imarli Street Number 28/426030EskisehirTurkey

We study one-and two-soliton solutions for the Cahn–Allen(CA) equation and the Brethorton equation. The CA equation has broad spectrum of applications especially in anti-phase boundary motion and it is used in phase-field *** the Brethorton equation is a model for dispersive wave systems, it is used to find the resonant nonlinear interaction among three linear modes. We use the Hirota bilinear method to obtain one-and two-soliton solutions to the CA equation and the Brethorton equation.

关键词： Hirota bilinear method soliton interaction evolution equations

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On the Use of Nanofluids in Solar Energy Applications

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Journal of Thermal Science 2020年第3期29卷 513-534页

作者： CUCE Erdem CUCE Pinar Mert GUCLU Tamer BESIR ahmet Burhaneddin Department of Mechanical Engineering Faculty of EngineeringRecep Tayyip Erdogan UniversityZihni Derin Campus53100 RizeTurkey Low/Zero Carbon Energy Technologies Laboratory Faculty of EngineeringRecep Tayyip Erdogan UniversityZihni Derin Campus53100 RizeTurkey Department of Energy Systems Engineering Faculty of EngineeringRecep Tayyip Erdogan UniversityZihni Derin Campus53100 RizeTurkey

Renewable energy technologies are in the centre of interest to narrow the gap between fossil fuels and clean energy *** dominant role of solar energy systems among the alternatives is beyond question owing to being associated with an infinite energy source,well-documented theory,simplicity,eco-friendly structure and notably higher energy and exergy efficiency range compared to other ***,in solar energy systems,conventional working fluids with poor thermophysical properties are still *** other words,further improvements are still available in the said systems by the use of unique nanoparticles with superior thermal,electrical,optical and mechanical *** the scope of this research,the applications of nanofluids in various solar energy systems such as tracking and non-tracking solar collectors,photovoltaic/thermal systems,solar thermoelectric devices,solar stills,solar thermal energy storage systems,solar greenhouses and solar ponds are comprehensively *** comparisons and discussions are proposed for the potential impacts of various nanofluids on coefficient of performance(COP)and thermodynamic performance figures of solar energy systems such as energy and exergy efficiency,effectiveness and *** challenges of nanofluids are also addressed which need to be resolved in further works.

关键词： nanofluids solar energy applications thermal and electrical performance COP cost

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Conventional and microwave irradiated synthesis,biological activity evaluation and molecular docking studies of highly substituted piperazine-azole hybrids

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Chinese Chemical Letters 2017年第5期28卷 995-1005页

作者： Arif Mermer Serpil Demirci Serap Basoglu Ozdemir ahmet Demirbas Serdar Ulker Faik ahmet Ayaz Fatma Aksakal Neslihan Demirbas Karadeniz Technical University Department of ChemistryTrabzon 61080Turkey Giresun University School of Applied ScienceDepartment of Crop Production and TechnologyGiresun 28000Turkey Recep Tayyip Erdogan University Department of BiologyRize 53100Turkey Karadeniz Technical University Department of BiologyTrabzon 61080Turkey Department of Chemistry Faculty of ScienceGebze Technical UniversityKocaeli 41400Turkey

Azole derivatives（3,6） obtained starting from 1-（2-methoxyphenyl） piperazine were converted to the corresponding Mannich bases containing β-lactame or flouroquinolone core via a one pot three component *** synthesis of conazole analogues was carried out starting from triazoles by three *** were carried out under conventional and microwave mediated *** the newly synthesized compounds were screened for their antimicrobial,enzyme inhibition and antioxidant activity,and most of them displayed good-moderate *** affinities and non-covalent interactions between enzyme-ligand complexes were predicted with molecular docking method at molecular *** results complemented well the experimental results on α-glucosidase and urease inhibitory effects of the *** binding affinities and much more interaction networks were observed for active compounds in contrary to inactive *** was predicted with the docking studies that triazole and anisole moieties in the structure of the synthesized compounds contributed to the stabilization of corresponding enzymes through noncovalent interactions.

关键词： Fluoroquinolone 1 2 4-Triazole Microwave Mannich reaction Biological activity Molecular docking

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Assessing fire severity in Turkey's forest ecosystems using spectral indices from satellite images

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林业研究:英文版 2023年第6期34卷 1747-1761页

作者： Coşkun Okan Güney ahmet Mert Serkan Gülsoy Department of Forest Fires Aegean Forestry Research Institute35430 IzmirTurkey Department of Wildlife Ecology and Management Faculty of ForestryIsparta University of Applied Science32260 IspartaTurkey Department of Soil Science and Ecology Faculty of ForestryIsparta University of Applied Science32260 IspartaTurkey

Fire severity classifications determine fire damage and regeneration potential in post-fire areas for effective implementation of restoration *** fire damage varies according to vegetation and fire characteristics,regional assessment of fire severity is *** objectives of this study were:(1)to test the performance of different satellite imagery and spectral indices,and two field—measured severity indices,CBI(Composite Burn Index)and GeoCBI(Geometrically structured Composite Burn Index)to assess fire severity;(2)to calculate classification thresholds for spectral indices that performed best in the study areas;and(3)to generate fire severity maps that could be used to determine the ecological impact of forest *** large fires in Pinus brutia(Turkish pine)and Pinus nigra *** ***(Anatolian black pine)—dominated forests during 2020 and 2021 were selected as study *** results show that GeoCBI provided more reliable estimates of field—measured fire severity than *** Sentinel-2 and Landsat-8/OLI images performed similarly well,MODIS performed *** severity classification thresholds were determined for Sentinel-2 based RdNBR,dNBR,dSAVI,dNDVI,and dNDMI and Landsat-8/OLI based dNBR,dNDVI,and *** several spectral indices,the highest accuracy for fire severity classification was found for Sentinel-2 based RdNBR(72.1%)and Landsat-8/OLI based dNBR(69.2%).The results can be used to assess and map fire severity in forest ecosystems similar to those in this study.

关键词： Remote sensing Forest fire Fire severity Spectral indices Composite burn index

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Different accelerated corneal collagen cross-linking treatment modalities in progressive keratoconus

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Eye and Vision 2019年第1期6卷 114-122页

作者： ahmet Kirgiz Mustafa Eliacik Yusuf Yildirim Department of Ophthalmology University of Health SciencesBagcilar Training and Research HospitalIstanbulTurkey Department of Ophthalmology Istanbul Medipol UniversityIstanbulTurkey University of Health Sciences Beyoglu Eye Training and Research HospitalIstanbulTurkey

Background:To compare the outcomes of two different protocols of accelerated corneal crosslinking(CXL)on visual,corneal high order aberrations(HOA)and topographic parameters in patients with progressive ***:In this prospective comparative study,sixty-six eyes of 66 patients with progressive keratoconus were divided into two groups;37 eyes in Group 1 received 18 mW/cm^(2) for five minutes,and 29 eyes in Group 2 were treated with 9 mW/cm^(2) for 10 *** uncorrected distant visual acuity(UCVA),best-corrected distant visual acuity(BCVA),corneal HOAs and topography parameters were measured preoperatively and postoperatively at the end of 12 *** data for the two groups were compared ***:The mean UCVA and BCVA were significantly improved at the postoperative 12 months compared with the preoperative values in both groups(P<0.05 for all).A significant improvement in corneal HOAs was observed in both groups(P<0.05 for all).The change in corneal coma value was significantly higher in Group 2(P<0.05).The change in keratometric values K1,K2,AvgK and maximum keratometry(AKf)were significantly higher in Group 2(P<0.05 for all).The regression model showed that the most important factor predicting the change in AKf was the type of CXL(β=−0.482,P=0.005).Conclusions:Accelerated CXL using 10 min of UVA irradiance at 9 mW/cm^(2) showed better topographic improvements and coma values than five minutes of UVA irradiance at 18 mW/cm^(2) independent of keratoconus severity.

关键词： Accelerated crosslinking Corneal collagen CXL High order aberrations Keratoconus Topography

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Synchronous and metachronous occurrence of gastric adenocarcinoma and gastric lymphoma: A review of the literature

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World Journal of Gastroenterology 2006年第22期12卷 3564-3574页

作者： Erhan Hamaloglu Serdar Topaloglu Arif Ozdemir ahmet Ozenc Department of Surgery School of Medicine Hacettepe University06100 SihhiyeAnkaraTurkey First Department of Surgery Ankara Numune Training and Research Hospital 06100 SlhhiyeAnkaraTurkey Co-first-authors:Erhan HamalogluSerdar Topaloglu

The occurrence of both primary gastric lymphoma and gastric adenocarcinoma in the same patient is a rare entity. The possible causative factors of synchronous or metachronous occurrence of both malignancies and variet... 详细信息

关键词： Gastric adenocarcinoma Gastric lymphoma Synchronous occurrence Metachronous occurrence

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Time to give up traditional methods for the management of gastrointestinal neuroendocrine tumours

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World Journal of Clinical Cases 2021年第29期9卷 8627-8646页

作者： ahmet Yozgat Murat Kekilli Mustafa Altay Department of Gastroenterology Ufuk UniversityAnkara06510Turkey Department of Gastroenterology Gazi UniversityAnkara 06560Turkey Department of Endocrinology and Metabolism University of Health Sciences TurkeyKeçiören Health Administration and Research CenterAnkara 06190Turkey

Neuroendocrine tumors(NETs)are a rare and heterogeneous disease group and constitute 0.5%of all *** annual incidence of NETs is increasing *** reason for the increase in the incidence of NETs is the detection of benign lesions,incidental detection due to the highest use of endoscopic and imaging procedures,and higher recognition rates of *** have been exciting developments regarding NET biology in recent *** these,first of all,somatostatin receptors and downstream pathways in neuroendocrine cells have been found to be important regulatory mechanisms for protein synthesis,hormone secretion,and ***,activation of the mammalian target of rapamycin pathway was found to be an important mechanism in angiogenesis and tumor survival and cell ***,the importance of proangiogenic factors(platelet-derived growth factor,vascular endothelial growth factor,fibroblastic growth factor,angiopoietin,and semaphorins)in the progression of NET has been *** the combination of biomarkers and imaging methods allows early evaluation of the appropriateness of treatment and response to treatment.

关键词： Enterochromaffin cells 68Ga-DOTATATE Gastrointestinal Neuroendocrine tumours Somatostatin receptor Targeted peptide receptor radiotherapy

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Analysis of serum antibody profile against H pylori VacA and CagA antigens in Turkish patients with duodenal ulcer

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World Journal of Gastroenterology 2006年第42期12卷 6869-6873页

作者： Yusuf Erzin Sibel Altun ahmet Dobrucali Mustafa Aslan Sibel Erdamar ahmet Dirican Murat Tuncer Bekir Kocazeybek Department of Gastroenterology Istanbul University Cerrahpasa Medical Fa-culty 34 303 Kocamustafapasa-Istanbul Turkey Department of Microbiology and Clinical Microbiology Istanbul University Cerrahpasa Medical Faculty 34303 Kocamustafapasa-Istanbul Turkey Department of Pathology Istanbul University Cerrahpasa Medical Faculty 34303 Kocamustafapasa-Istanbul Turkey Department of Biostatistics Istanbul University Cerrahpasa Medical Faculty 34303 Kocamustafapasa-Istanbul Turkey

AIM: To investigate the frequency of seropositivity aga- inst CagA, VacA proteins and to determine their indepen- dent effects on the development of duodenal ulcer (DU) in Turkish patients. METHODS: The study was designed as a prospective one from a tertiary referral hospital. Dyspeptic patients who were referred to our endoscopy unit for upper gas- trointestinal endoscopy between June 2003 and March 2004 and diagnosed to have DU or nonulcer dyspepsia (NUD) were included. Biopsies from the antrum and body of the stomach were taken in order to assess the current H pylori status by histology, rapid urease test and culture. Fasting sera were obtained from all patients and H pylori status of all sera was determined by IgG antibo- dies using an enzyme-linked immunosorbent assay (ELI- SA) kit. All seropositive patients were further analysed using Western blot assays detecting IgG antibodies aga- inst CagA and VacA proteins. The χ2 test was used for statistical comparison of the values and age-sex adjusted multiple regression analysis was used to determine the independent effects of CagA and VacA seropositivities on the development of DU. RESULTS: Sixty-three patients with DU and 62 patients with NUD were eligible for the final analysis. Seropositi- vity for anti-CagA was detected in 51 of 62 (82%), andin 55 of 63 (87%) patients with NUD and DU, respec- tively (p = no significance), and seropositivity for anti- VacA was found in 25 of 62 (40% ) and in 16 of 63 (25%) patients, with NUD and DU, respectively. CONCLUSION: These findings suggest that none of the- se virulence factors is associated with the development of DU in the studied Turkish patients with dyspepsia.

关键词： H pylori Western blot CagA VacA Duode- nal ulcer

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Synthesis, Spectroscopic and Electrochemical Investigations of Two vic-Dioximes and Their Mononuclear Ni（Ⅱ）, Cu（Ⅱ） and Co（Ⅱ） Metal Complexes Containing Morpholine Group

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Chinese Journal of Chemistry 2006年第11期24卷 1599-1604页

作者： KILIC, ahmet TAS, Esref GUMGUM, Bahattin YILMAZ, Ismail Department of Chemistry Harran University Sanliurfa 63510 Turkey Department of Chemistry Dicle University Diyarbakir 21280 Turkey Department of Chemistry Technical University oflstanbul Istanbul Maslak 34469 Turkey

Two vic-dioxime ligands （LxH2） containing morpholine group have been synthesized from 4-[2-（dimethylaminoethyl）] morpholine with anti-phenylchloroglyoxime or anti-monochloroglyoxime in absolute THF at -15 ℃. Reaction of two vic-dioxime ligands with MCl2·nH2O （M： Ni, Cu or Co and n=2 or 6） salts in 1 ： 2 molar ratio afforded metal complexes of type [M（LxH）2] or [M（LxH）2·2H2O]. All of metal complexes are non-electrolytes as shown by their molar conductivities （Am） in DMF （dimethyl formamide） at 10^-3 mol·L^-1. Structures of the ligands and metal complexes have been solved by elemental analyses, FT-IR, UV-Vis, ^1H NMR and ^13C NMR, magnetic susceptibility measurements, molar conductivity measurements. Furthermore, redox properties of the metal complexes were investigated by cyclic voltammetry.

关键词： morpholine electrochemistry dioxime structure metal complex cyclic voltammetry

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