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Öğe Otomotiv fren balatalarının sürtünme performansında sic etkisi(Uludağ Üniversitesi, 2012-06) Altun, Şehmus; Öner, Cengiz; Sugözü, İlkerBu çalışmada, yüksek mukavemet, düşük aşınma, daha fazla yük ve sıcaklık dayanımı özelliklerine sahip SiC içeren balata numunelerinin sürtünme katsayısı ve aşınma dayanımına etkisi incelenmiştir. Balata bileşeni içerisine %5, %10 ve %15 SiC ilave edilmiştir. Sonuç olarak, SiC oranı arttıkça aşınma direnci artmış ve sürtünme katsayısı azalmıştırÖğe Atatürk ve milletin efendisi: köylü(Türk-İslam Medeniyeti Akademik Araştırmalar Dergisi, 2014) Yaşar, SelmanAtatürk Milli Mücadeleye başlarken elinde silah, cephane, asker vb. hiçbir şey yoktu. Ülke işgal edilmeye başlandığı zaman, Samsun’a çıktığında dayandığı tek güç Türk Milletiydi. Milli Mücadele O’nun önderliğinde kazanıldı ve Türkiye Cumhuriyeti kuruldu. Ancak asıl mücadele bundan sonra başlıyordu. Türk Milleti genciyle yaşlısıyla, kadını erkeğiyle, köylüsü, şehirlisiyle Atatürk’e destek oldu. Atatürk Türk milletine, özellikle Türk köylüsüne büyük bir sevgi duyardı. Türk köylüsünün zaferden sonra hak ettiği yere gelmesi için uğraştı. Atatürk’e göre milletin efendisi olan köylü, efendi seviyesine getirilinceye kadar çalışılmalıydı. Bu sağlandığı zaman ülkenin de yükseleceğini biliyordu. Yaşamı boyunca bu amacını gerçekleştirmek için gayret etti. Köylünün ilerlemesine engel olan vergileri kaldırdı, onun toprak sahibi olmasına çalıştı. Üretimin arttırılması için gerekli tedbirleri aldı. Bunun yanında köylünün eğitimiyle de ilgilendi. Atatürk’ün bu çalışmaları sonucu Türk köylüsü hak ettiği yere geldi. Bu makalede Atatürk’ün Türk köylüsüne verdiği önem ele alınmıştır.Öğe Atatürk ve çocuk eğitimi(Türk-İslam Medeniyeti Akademik Araştırmalar Dergisi, 2014) Yaşar, SelmanKurduğu cumhuriyeti koruma görevini gençliğe bırakan Atatürk, gençliğin başlangıç evresi olan çocukluk döneminin birey için öneminin faı·kındaydı. Çocukların iyi yetiştirilmesinin sağlam bir toplum oluşturulması açısından gerekli olduğunu bilen Atatürk, onların yetişmesinde ailenin, okulun ve öğretmenierin önemli bir yer tuttuğunu belirtmiştir. Atatürk, ailelerin çocuklarını yetiştirirken onları yarının büyükleri olarak görmelerini istiyordu. Atatürk' e göre okul çocuğun yetişmesinde birinci derecede rol oynamaktay dı. Öğretmenierin yeni neslin yetiştirilmesinde önemli bir görevi olduğunu bilen Atatürk, öğretmenierin görevinin sadece okulla sınırlı olmadığını söylemiş ve okul dışında da öğrencilerinin yetişmesiyle ilgilenmesi gerektiğini belirtmiştir. Atatürk, çocukların yetiştirilmesinde izlenecek yolun akıl ve bilim olduğuna inanıyordu. Atatürk, Türk çocuklarının sadece müsbet bilimlerde değil, aynı , zamanda sanatta, sporda vb. her alanda kendilerini en iyi şekilde yetiştirmeleri gerektiğini söyle miştir.Öğe N-type InP Schottky diodes with organic thin layer: Electrical and interfacial properties(Journal of Vacuum Science & Technology B, 2010-03) Güllü, Ömer; Turut, AbdulmecitThe rectifying junction characteristics of methyl red (MR) organic film on n-type InP substrate have been studied. It has been observed that MR-based structure shows an excellent rectifying behavior and that the MR film increases the effective barrier height by influencing the space charge region of the n-type InP. The barrier height and ideality factor values for this structure have been obtained as 0.75 eV and 1.93 from the forward bias current-voltage characteristics, respectively. By using capacitance-voltage characteristics at 1 MHz, the barrier height and the carrier concentration values have been calculated as 0.93 eV and 5.13×1015 cm−3, respectively. The energy distributions of the interface states and their relaxation times have been determined from the forward bias capacitance-frequency and conductance-frequency characteristics. Moreover, it was seen that both the interface-state density and the relaxation time of the interface states decreased with bias voltage from experimental results.Öğe Investigation of plasma arc cutting parameters with type-2 fuzzy set and system(De Gruyter, 2013-10) Çelik, Yahya Hışman; Özek, Cebeli; Bulut Özek, MüzeyyenThe objective of the present study was it to design a type-2 fuzzy set and system in order to predict surface roughness and hardness depending on the parameters (material thickness, cutting speed, arc voltage and current) of the plasma arc cutting process of S235JR sheet materials. Therefore, some experimental studies were conducted. The experimentally determined data were used to describe the type-2 fuzzy set and system. Type-2 fuzzy set and system was found to be usefull to predict surface roughnes and hardness. According to the obtained values, the best surface roughness and the values closest to the hardness of the raw material were obtained at 1500 mm/min cutting speed, 8 mm material thickness, 115 V arc voltage and 80 A current.Öğe Biodiesel production from inedible animal tallow and an experimental investigation of its use as alternative fuel in a direct injection diesel engine(Elsevier, 2009-02-15) Altun, Şehmus; Öner, CengizIn this study, a substitute fuel for diesel engines was produced from inedible animal tallow and its usability was investigated as pure biodiesel and its blends with petroleum diesel fuel in a diesel engine. Tallow methyl ester as biodiesel fuel was prepared by base-catalyzed transesterification of the fat with methanol in the presence of NaOH as catalyst. Fuel properties of methyl ester, diesel fuel and blends of them (5%, 20% and 50% by volume) were determined. Viscosity and density of fatty acid methyl ester have been found to meet ASTM D6751 and EN 14214 specifications. Viscosity and density of tallow methyl esters are found to be very close to that of diesel. The calorific value of biodiesel is found to be slightly lower than that of diesel. An experimental study was carried out in order to investigate of its usability as alternative fuel of tallow methyl ester in a direct injection diesel engine. It was observed that the addition of biodiesel to the diesel fuel decreases the effective efficiency of engine and increases the specific fuel consumption. This is due to the lower heating value of biodiesel compared to diesel fuel. However, the effective engine power was comparable by biodiesel compared with diesel fuel. Emissions of carbon monoxide (CO), oxides of nitrogen (NOx), sulphur dioxide (SO2) and smoke opacity were reduced around 15%, 38.5%, 72.7% and 56.8%, respectively, in case of tallow methyl esters (B100) compared to diesel fuel. Besides, the lowest CO, NOx emissions and the highest exhaust temperature were obtained for B20 among all other fuels. The reductions in exhaust emissions made tallow methyl esters and its blends, especially B20 a suitable alternative fuel for diesel and thus could help in controlling air pollution. Based on this study, animal tallow methyl esters and its blends with petroleum diesel fuel can be used a substitute for diesel in direct injection diesel engines without any engine modification.Öğe Atık kızartma yağlarının alternatif dizel motor yakıtı olarak değerlendirilmesi(TMMOB Makina Mühendisleri Odası, 2011) Adin, Hamit; Yaşar, Fevzi; Altun, ŞehmusÖğe Effects of cutting parameters and point angle on thrust force and delamination in drilling of CFRP(De Gruyter, 2014-11-14) Çelik, Yahya Hışman; Kılıçkap, Erol; Yardımeden, AhmetParts made of composite materials are generally produced by near-net-shape technology. However, additional machining operations such as drilling are often required to facilitate components assembling. Drilling of composite materials is also a common process in the assembly of aerospace and automotive composite structures. During drilling, unlike the conventional materials, a few damage forms may take place. Among these damage forms, the delamination is the most important one. Therefore, the experimental studies carried out on drilling of CFRP composite materials for determining optimum processing parameters are of great importance. In this particular study, delamination in CFRP composites caused by drilling was investigated. The composite material was drilled under various spindle speeds, feed rates and drill point angles. The results showed that delamination and thrust forces were affected by cutting parameters. It was demonstrated that feed rate and drill point angle make the largest contribution to the overall performance.Öğe Doğal fiber takviyeli kompozitler üzerine bir derleme çalışması(IESS Publishing, 2019-06) Çelik, Yahya Hışman; Yalçın, RojinÖğe General conditions, problems and expectations of Syrian migrants in Turkey(Akademisyen Kitabevi, 2019-06-17) Türk, Emrullah; Nerse, SerdarThe directors of Academician Publishing House, have been conducting their commercial activities for a long time by transferring their 30 years of broadcasting experience to their legal entities. In the said period, it was proud to publish 750 books, particularly health and social sciences, cultural and artistic topics. The Academician, that defines the platform of being an international publishing house, is in the pursuit of creating a global brand in addition to broadcasting in Turkish and foreign languages. The books, which are considered as permanent documents of scientific and intellectual studies, are the witnesses of hundreds of years as an information recording platform. The future of the book, which has built on a solid basis with the invention of the printing press, will certainly have a place in our lives for a long period of time, even though it has moved into orbit of new inventions. Academician Publishing House has started the process of publishing books in international quality and quantity with its own name of “Scientific Research Book” series in Turkish and English. The publication process, which will take place in March and September every year, will continue with thematic sub titles. We owe to our thanks to all of our researchers who supported this process, which was starting with about 30 books, and to everyone in the background
