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Öğe Batman ilinin doğal gaz ihtiyacının ve hava kirliliğini azaltmasının matematiksel yöntemlerle modellenmesi(Karabük Üniversitesi, 2009) Aydın, Hüseyin; Yaşar, Fevzi; Bezek Güre, ÖzlemÖğe The fuel properties of methyl esters produced from canola oil- animal tallow blends by basecatalyzed transesterification(Kırıkkale Üniversitesi, 2010-06) Altun, Şehmus; Yaşar, Fevzi; Öner, CengizBiodiesel is an alternative diesel fuel that can be produced from renewable feedstocks such as vegetable oil or animal fats by transesterification with methanol for using in diesel engines. The viscosity and density of biodiesel fuels are important parameters due to being key fuel properties for injection and combustion process of diesel engines. These fuel properties mainly depend on the feedstock which is used in the biodiesel production. In this study, the blends containing 0, 25, 50, 75 and 100% of food-grade canola oil/inedible animal tallow in volume basis were prepared and converted into methyl esters by base-catalyzed transesterification. Effect of inedible animal tallow-canola oil blends on the viscosity and density of methyl esters were investigated. Experimental results showed that the kinematics viscosity of methyl esters increased as animal tallow ratio increased in the feedstock. Besides, it was observed that density did not change muchÖğe Onarımda kullanılan darbe dayanımlı iki bileşenli yapıştırıcılar(Fırat Üniversitesi, 2011) Adin, Hamit; Altun, Şehmus; Yaşar, FevziÖğe Biodiesel properties of microalgae (Chlorella protothecoides) oil for use in diesel engines(Taylor & Francis, 2018-09-08) Yaşar, Fevzi; Altun, ŞehmusIn this study, biodiesel was produced from a microalgae oil, chlorella protothecoides, by typical alkali-catalyzed transesterification in conditions such as a 0.75 wt.% KOH of the oil as catalyst, 68°C and 80 min which was agreed as optimal conditions after investigating the effect of KOH concentration, reaction temperature and time at constant molar ratio of 6:1 on the conversion rate and fuel properties. Under these conditions, a 98.6% conversion rate of algae oil to its methyl ester was achieved with ester content higher than 96%. Furthermore, all physicochemical properties met the requirements of international biodiesel standards, EN 14214 and ASTM D 6751, with some remarkable ones such as high cetane number (57.3) and low CFPP (−10°C). The effect of microalgae biodiesel volume fraction in the fuel on the kinematic viscosity, CFPP, lubricity, density, and distillation temperature was also studied. A blending ratio of the algal-biodiesel up to 50% (v/v) was also found in agreement with the standards for biodiesel-diesel blends. From GC analysis, oleic and linoleic acids were found to be major fatty acids, and then the oxygen extended sooting index and adiabatic flame temperature were calculated using fatty acid distribution for evaluating the main diesel emissions such as soot and NO. As a result, the algae oil studied here was found to be an appropriate raw material for producing biodiesel and for using in Diesel Engines and its properties are within the typical ranges of conventional biodiesel fuels.Öğe Batman şehir merkezinde hava kirliliği ve kontrolü(Batman Üniversitesi, 2017) Adin, Hamit; Yaşar, Fevzi; Altun, Şehmus; İşcan, BahattinBu çalışmada yapılan analizler, geçmiş yılların verileri ve en önemli atmosferik hava kirliliği bileşenlerinin ölçüm değerleri kullanılarak Batman şehir merkezindeki hava kirliliği kalite indekslerine göre araştırılmıştır. Batman şehir merkezide, hava kirliliği oluşturan temel bileşenlerden olan kükürtdioksit(SO2) ve partikül maddeler (PM) 2006-2011 yılları için incelenmiştir. Ölçülen değerler, Hava Kalitesi Kontrol Yönetmeliği (HKKY) ve Avrupa Birliğinin (AB) belirlediği sınır değerlere göre kıyaslanmıştır. Buna göre, Batman şehir merkezindeki hava kirliliği sınır değerleri HKKY değerlerinin altında kalmış fakat AB’nin belirlediği sınır değerlerin üstünde kalmıştır. Sonuç olarak, Batman şehir merkezinde düzenli hava kalitesi ölçümleri yapılmamakta olup, yerel bir çevre komitesinin oluşturulması, hava kirliliğinin önlenmesinde gerekli tedbirlerin alınması gerekmektedir. Alınması gereken tedbirler ayrıca sıralanmıştır.Öğe A comparison of performance and emissions of a diesel power generator fueled with biodiesels from waste frying oils(The International University of Sarajevo, 2013) Altun, Şehmus; Yaşar, FevziÖğe Biodiesel production from raw cottonseed oil and its characterization(Energy Education Science and Technolgy Part A, 2011-07) Altun, Şehmus; Yaşar, Fevzi; Öner, CengizIn this study, raw cottonseed oil of Turkish origin was transesterified using methyl alcohol and an alkali catalyst to obtain the cottonseed oil methyl ester. The obtained cottonseed oil methyl ester was analyzed by gas chromatography (GC) for determining the fatty acid composition. The fuel-related properties of cottonseed oil methyl ester, cold filter plugging point, cloud point, kinematic viscosity, density, cetane index, flash point, distillation, sulfur content and heating value were determined and compared with those of petroleum diesel fuel and international biodiesel standards. From gas chromatograph analysis, it was found that the cottonseed oil methyl ester has the more amount of total unsaturated FA, therefore, it showed better cold-flow properties than more saturated ones, as expected. Moreover, the fuel-related properties of cottonseed oil methyl ester were within the specified standardsÖğe Fuel properties of biodiesels produced from blends of canola oil and animal tallow(SILA SCIENCE, 2011-04) Adin, Hamit; Altun, Şehmus; Yaşar, FevziBiodiesel is an alternative diesel fuel that can be produced from renewable feedstocks such as vegetable oil or animal fats by transesterification with methanol for using in diesel engines. The viscosity and density of biodiesel fuels are important parameters due to being key fuel properties for injection and combustion process of diesel engines. These fuel properties mainly depend on the feedstock which is used in the biodiesel production. Also, lubricity is an important for diesel engine fuels due to the fuel injection systems are lubricated by the fuel itself. In this study, the blends containing 0, 25, 50, 75 and 100% of food-grade canola oil/inedible animal tallow in volume basis were prepared and converted into methyl esters by base-catalyzed transesterification. Effect of canola oil ration in the feedstock on the viscosity, density and lubricity were investigated. Lubricity was determined using the high-frequency reciprocating rig (HFRR) test. Experimental results showed that the kinematics viscosity of increased as animal tallow ratio increased in the feedstock, as animal tallow itself is more viscous than canola oil. Also, density did not change much when blended feedstocks were used. Besides, it was observed that lubricity of biodiesel fuels from blended feedstocks was slightly get worse compared with pure biodiesels.Öğe Şırnak yöresindeki asfaltit kömürler ve özellikleri(Dicle Üniversitesi, 2010) Adin, Hamit; Altun, Şehmus; Yaşar, FevziEnerjinin giderek küreselleşmesi ve değişen piyasa şartları ile izlenen liberal ekonomik modeller; bir yanda dışa bağımlılığı asgari seviyelere çekecek, öte yandan ekonomik canlanmaya en üst düzeyde katkıda bulunacak enerji politikalarının uygulanmasını gerekli hale getirmektedir. Sadece diğer fosil kaynaklara göre rezervin büyüklüğü açısından değil, kömür yataklarının yurdumuzun çeşitli bölgelerine dağılmış olması, ekonomik kalkınmaya son derece olumlu etkide bulunması, işletilmesi nedeniyle ortaya çıkan katma değer, elektrik enerjisi üretiminde ucuz hammadde olması ve emniyetli taşınması gibi faktörler kömürü en önemli fosil enerji kaynağı haline getirmektedir. Bu çalışmada, Şırnak kömürü çeşitli yönleriyle ele alınmış, sorunlar tartışılmış ve çözüme yönelik politikalar oluşturulmaya çalışılmıştırÖğe Asfalt depolama tanklarının kızgın yağ ile ısıtılması ve sistemdeki ısı transferinin incelenmesi(Fırat Üniversitesi, 2011) Adin, Hamit; Altun, Şehmus; Yaşar, Fevzi; Işık, Mehmet Zerrakki; Işık, Süleyman Kazım
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