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Öğe Bizmut temelli süperiletkenlerde tanecik sınırlarının ve ag-seramik arayüzün özellikleri(2007) Belenli, Ibrahim; Akdoğan, Mustafa-Öğe Investigation of Layered Structure Formation in MgB2 Wires Produced by the Internal Mg Coating Process under Low and High Isostatic Pressures(Mdpi, 2024) Gajda, Daniel; Babij, Michal; Zaleski, Andrzej; Avci, Dogan; Karaboga, Firat; Yetis, Hakan; Belenli, IbrahimCurrently, MgB2 wires made by the powder-in-tube (PIT) method are most often used in the construction and design of superconducting devices. In this work, we investigated the impact of heat treatment under both low and high isostatic pressures on the formation of a layered structure in PIT MgB2 wires manufactured using the Mg coating method. The microstructure, chemical composition, and density of the obtained superconductive wires were investigated using scanning electron microscopy (SEM) with an energy-dispersive X-ray spectroscopy (EDS) analyzer and optical microscopy with Kameram CMOS software (version 2.11.5.6). Transport measurements of critical parameters were made by using the Physical Property Measurement System (PPMS) for 100 mA and 19 Hz in a perpendicular magnetic field. We observed that the Mg coating method can significantly reduce the reactions of B with the Fe sheath. Moreover, the shape, uniformity, and continuity of the layered structure (cracks, gaps) depend on the homogeneity of the B layer before the synthesis reaction. Additionally, the formation of a layered structure depends on the annealing temperature (for Mg in the liquid or solid-state), isostatic pressure, type of boron, and density of layer B before the synthesis reaction.Öğe AN INVESTIGATION OF WAVE ENERGY POTENTIAL IN WESTERN BLACK SEA REGION(Pamukkale Univ, 2006) Uygur, Ilyas; Demirci, Recep; Saruhan, Hamit; Ozkan, Arif; Belenli, IbrahimThe main energy sources which are natural, clean, environmentally friendly, and renewable are wind power, solar energy, biomass energy, hydro energy, and wave energy. The wave energy has no cost except for the first investment and maintenance. There is also no cost for input energy. Besides these, it has no pollution effect on the environment, it is cheap and there is a huge potential all around the world. Wave energy is a good opportunity to solve the energy problem for Turkey which is surrounded by seas. Concerning all these facts, it has been conducted some studies which included five years of observation in the Western Black Sea Region (Akcakoca). The wave energy potential has also been calculated. From this sutdy results, it can be concluded that the wave energy potential of this region is inefficient. It is believed that by the improvement of the new energy converter devices in future, this low potential can be used more efficiently and as a result this study might be used as a basis for the future researches.Öğe MgB 2 /Fe Parkur Tipi Bobin Tasarımı ve Üretimi(2016) Belenli, Ibrahim; Gencer, Ali; Karaboğa, Firat; Demirtürk, Emine; Akdoğan, Mustafa; Yetiş, Hakan; Pilten, Emir-Öğe SPECTRAL SOUND ANALYSIS AND SOUND BOARD OPTIMIZATION OF TRADITIONAL MUSICAL INSTRUMENT QANUN *(2018) Yilmaz, Serdar; Belenli, Ibrahim; Kurtaslan, ZaferThe present study was on the sound of a traditional instrumentQanun and investigated the effects of soundboards of different thicknesson tone characteristics. Changes in sound level were observed. Theacoustic envelopes contained three regions were drawn for all of pitches.The changes in the sound levels were studied on this graphic. FourierAnalysis was made on recordings. Frequency distribution curves werealso drawn. Fundamental and overtone level distributions were shownon these graphics. The levels of harmonics were compared tofundamental level on these graphics. The structures of upper partialtones were studied. Frequency ranges of the graphics were limited to 100-10000 Hz. The numeric values on the all of graphics were analysed; andthe differences between all overtones were noted. A typical sound levelcurve for the Qanun was shown. In 3.0 mm thickness, due to theirregular resonances resulting from the thin body, too many harmonicsand long decay periods were observed. In higher thicknesses, the Qanuncannot show its unique timbre due the dimness and scarcity ofharmonics. Because of the evaluation of graphics and numeric values, a3.5 mm thick soundboard was suggested as the most appropriatesoundboard. The findings obtained in the present study are valid for thestandard structure that is commonly used. However, these findings canbe guiding for qanuns of different structures.Öğe Sürekli boru yapma ve doldurma yöntemi ile B(P)Scco-2223 üstüniletken şerit üretimi ve bu şeritlerden üstüniletken trafo yapımı(2012) Terzioğlu, Cabir; Atasoy, Efkan; Çakiroğlu, Ömer; Belenli, Ibrahim-
