Browsing by Author "Ülgen, Asaf Tolga"
Now showing items 1-19 of 19
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Contribution of vanadium particles to thermal movement of correlated two-dimensional pancake Abrikosov vortices in Bi-2223 superconducting system [Contribución de las partículas de vanadio al movimiento térmico de los vórtices de Abrikosov tipo panqueque bidimensionales correlacionados en el sistema superconductor Bi-2223]
Ülgen, Asaf Tolga; Erdem, ümit; Yıldırım, Gürcan; Türköz, Mustafa Burak; Turğay, Tahsin (Sociedad Espanola de Ceramica y Vidrio, 2022)This article breaks new ground in understanding of variation in the magnetic strength performance, flux pinning and energy dissipation mechanism of polycrystalline bulk Bi1.8Sr2.0Ca2.2Cu3.0Oy (Bi-2223) superconducting ... -
Degradation in fundamental characteristic features of Bi-2212 superconducting ceramic material with Sr/Ti partial substitution
Ülgen, Asaf Tolga; Yıldırım, Gürcan (JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS, 2019)The present work investigates the vital differentiations in some basic characteristic properties including the crystallinity quality, flux pinning mechanism, superconducting, dc electrical features, grain boundary coupling ... -
A detailed research for determination of Bi/Ga partial substitution effect in Bi-2212 superconducting matrix on crucial characteristic features
Güner, Sait Barış; Zalaoğlu, Yusuf; Turğay, Tahsin; Özyurt, Ömer; Ülgen, Asaf Tolga; Doğruer, Musa; Yıldırım, Gürcan (JOURNAL OF ALLOYS AND COMPOUNDS, 2019)This multidisciplinary study paves way to investigate the crucial of fundamental characteristic properties including the bulk density, electrical, superconducting, flux pinning mechanism, crystal structure quality and ... -
DOĞRUDAN METANOLLÜ YAKIT HÜCRELERİ İÇİN TiO2 DESTEKLİ ANOT GELİŞTİRİLMESİ
Ülgen, Asaf Tolga; Döner, Ali; Haskul, Mehmet (Uludağ Üniversitesi Mühendislik Fakültesi Dergisi, 2019): Metanollü yakıt hücreleri için çok duvarlı ve kaliteli TiO2 nano-tüpler (TiO2-NTs) katalizör desteği olarak hazırlanmıştır. Sıralı TiO2-NTs hazırlandıktan sonra yüzeyine küçük miktarlarda nikel (Ni) nanotanecikleri ... -
Effect of annealing ambient conditions on crack formation mechanisms of bulk Bi-2212 ceramic systems
Erdem, Ümit; Akkurt, Bahadır; Ülgen, Asaf Tolga; Zalaoğlu, Yusuf; Turğay, Tahsin; Yıldırım, Gürcan (Taylor and Francis Ltd., 2021)This study paves way to examine the influence of different annealing conditions (temperature range of 830-850°C and duration intervals 24-48 h) on the fundamental mechanical performance and characteristic quantities of ... -
Effect of vanadium addition on fundamental electrical quantities of Bi-2223 crystal structure and semi-empirical model on structural disorders-defects
Ülgen, Asaf Tolga; Erdem, Ümit; Zalaoğlu, Yusuf; Tuğray, Yusuf; Yıldırım, Gürcan (SPRINGER, 2020)The primary contribution of the present study is to determine the effect of vanadium addition on the fundamental aspects of characteristic crystalline and electrical quantities for the Bi1.8Sr2.0Ca2.2Cu3.0VxOy (0.00 <= x ... -
Evaluation of crystallographic and electrical-superconducting features of Bi-2223 advanced ceramics with vanadium addition
Akkurt, Bahadır; Erdem, Ümit; Zalaoğlu, Yusuf; Ülgen, Asaf Tolga; Turğay, Tahsin; Yıldırım, Gürcan (SPRINGER, 2021)In the current study, the effect of vanadium particles on the electrical, superconducting, crystallographic, key structural and morphological features of Bi1.8Sr2.0Ca2.2Cu3.0VxOy superconducting materials is examined with ... -
Evaluation of load-independent microhardness values in Plateau regions of Vanadium substituted Bi-2212 ceramics
Ülgen, Asaf Tolga; Okur, Semih; Erdem, Ümit; Pakdil, Murat; Turgay, Tahsin; Yıldırım, Gürcan (IOP Publishing Ltd, 2022)This study reveals extensively effect of homovalent V/Bi partial replacement in Bi2.0-xVxSr2.0Ca1.1Cu2.0Oy ceramic matrix (0.00 <= x <= 0.30) on the key mechanical design performance parameters and load-independent Vickers ... -
Evaluation of Superconducting Properties and Diffusion Behavior of Ex Situ and In Situ Bulk MgB2 Materials with Ni Coating
Ülgen, Asaf Tolga (JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM, 2019)Ex situ and in situ bulk MgB2 superconducting materials have successfully been produced by the simple amorphous boron and nano-amorphous boron powders with the processes of ball milling, pressing, and annealing. The ... -
Fabrication and characterization of Ni modified TiO2 electrode as anode material for direct methanol fuel cell
Haskul, Mehmet; Ülgen, Asaf Tolga; Döner, Ali (PERGAMON-ELSEVIER SCIENCE LTD, 2020)Highly ordered porous titanium dioxide nanotube (TiO2-NT) surfaces were prepared with anodization method to obtain a larger specific surface area that plays a very important role in methanol oxidation. In this regard, ... -
Improved transport properties of MgB2 superconducting round wires via minute addition of gold nanoparticles
Ülgen, Asaf Tolga; Karaboğa, Fırat; Karakaya, Mehmet; Podila, Ramakrishna; Rao, Apparao M.; Belenli, İbrahim (ELSEVIER SCI LTD, 2019)This study investigates the effect of gold nanoparticles (Au-NPs) on structural, morphological, electrical and magnetic properties of Fe/MgB2 wires 1.00 mm in diameter. Au-NPs were obtained by pulsed laser ablation of gold ... -
Mechanical properties and uniformity of Fe-MgB2 wires upon various wire drawing steps
Karaboğa, Fırat; Ülgen, Asaf Tolga; Yetiş, Hakan; Akdoğan, Mustafa; Pakdil, Murat; Belkenli, İbrahim (MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2018)Effect of drawing process on the mechanical properties and cross-sectional uniformity of Fe/MgB2 mono-filamentary wires were investigated in this study. Successive cold drawing steps were applied with and without intermediate ... -
MgB2 süperiletken külçe malzemesine altın kaplamasının etkileri
Ülgen, Asaf Tolga (Balıkesir Üniversitesi Fen Bilimleri Enstitüsü Dergisi, 2017)Magnezyum diborür (MgB2) süperiletken külçe malzemeleri argon atmosferinde ex-situ (hazır toz) ve in-situ (Mg+2B) katıhal reaksiyon yöntemiyle hazırlanmıştır. Ex-situ/in-situ MgB2 süperiletken örneklerin bir yüzeyine ~50 ... -
A novel research on the subject of the load-independent microhardness performances of Sr/Ti partial displacement in Bi-2212 ceramics
Ülgen, Asaf Tolga; Zalaoğlu, Yusuf; Turğay, Yusuf; Erdem, Ümit; Türköz, Mustafa Burak; Yıldırım, Gürcan (SPRINGER, 2020)This work is interested in the critical changes in the load-independent microhardness performance parameters with the partial substitution of Sr2+ inclusions for the Ti4+ impurities in the Bi-2212 inorganic solids with the ... -
Role of active slip systems induced with holmium impurity in Bi-2212 ceramics on mechanical design performance and morphological properties
Ülgen, Asaf Tolga; Çetin, Samet; Zalaoğlu, Yusuf; Türköz, Mustafa Burak; Turğay, Tahsin (ELSEVIER SCI LTD, 2022)Effect of Ho/Bi partial replacement in Bi2.1-xHoxSr2.0Ca1.1Cu2.0Oy (Bi-2212) superconductors on the fundamental structural, morphological and mechanical performance properties are investigated by Scanning Electron Microscopy ... -
Role of Bi/Tm substitution in Bi-2212 system on crystal structure quality, pair wave function and polaronic states
Ülgen, Asaf Tolga; Turgay, Tahsin; Terzioğlu, Cabir; Yldırım, Gürcan; Öz, Muhammed (JOURNAL OF ALLOYS AND COMPOUNDS, 2018)This comprehensive study finds strongly out the crucial variations in the dc electrical resistivity, superconducting, crystal structural and flux pinning mechanisms with the partial replacement of homovalent Tm+3 inclusions ... -
Role of trivalent Bi/Tm partial substitution on active operable slip systems in Bi-2212 crystal structure
Erdem, Ümit; Zalaoğlu, Yusuf; Ülgen, Asaf Tolga; Turğay, Tahsin; Yıldırım, Gürcan (ELSEVIER LTD, 2021)This study delves into three main subjects: (I) A strong definition on the variation of fundamental key mechanical design performance and general mechanical characteristic features founded on the formation of active operable ... -
Theoretical Examinations of Diammonium Hydrogen Citrate Compound by Density Functional Theory Method at B3LYP/6-31G(d,p) Level of Theory
Ülgen, Asaf Tolga; Turğay, Tahsin; Akkurt, Bahadır; Yıldırım, Gürcan (Şırnak Üniversitesi, 2019)This study aims to point out a strong strategy between the fundamental characteristic features as regards such as chemical reactivity, stable, electronic acceptor ability, bioactivity, kinetic stability, polarizability and ... -
Time-Dependent Diffusion Coefficient of Fe in MgB2 Superconductors
Ülgen, Asaf Tolga; Belenli, İbrahim (JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM, 2017)The iron (Fe) diffusion in superconducting MgB2 bulk samples has been studied for sintering time durations of 15 min, 30 min, 1 h, 2 h, and 4 h at 900(ay)C. Fe coating bulk polycrstalline superconducting MgB2 samples for ...
